/* ========================================
   ОСНОВНЫЕ ПЕРЕМЕННЫЕ И БАЗОВЫЕ СТИЛИ
   ======================================== */

:root {
  /* Основная цветовая палитра */
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: #dbeafe;
  --secondary: #64748b;
  --accent: #10b981;
  --accent-light: #d1fae5;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  
  /* Цвета для сложности */
  --easy: #00b8a3;
  --easy-bg: #e8f5e8;
  --medium: #ffc01e;
  --medium-bg: #fff7e6;
  --hard: #ff375f;
  --hard-bg: #ffe6e6;
  
  /* Нейтральные цвета */
  --bg: #f8fafc;
  --bg-secondary: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  --focus-ring: rgba(59, 130, 246, 0.28);
  
  /* Размеры */
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;
  --spacing-2xl: 32px;
  
  /* Шрифты */
  --font-family: 'IBM Plex Sans', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, 'Cascadia Code', Consolas, monospace;
  /* Описание задач: тот же UI-стек, без скачка относительно остального сайта */
  --font-problem: 'IBM Plex Sans', 'Segoe UI', system-ui, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font-family);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Атмосфера фона: мягкие цветовые пятна + «пыль» (без анимации).
   Light: aurora/bokeh; Dark: luminous dust. */
:root {
  --bg: #eef3f9;
  --atmos-wash-1: rgba(56, 189, 248, 0.28);
  --atmos-wash-2: rgba(52, 211, 153, 0.22);
  --atmos-wash-3: rgba(96, 165, 250, 0.18);
  --atmos-wash-4: rgba(125, 211, 252, 0.2);
  --atmos-dot: rgba(37, 99, 235, 0.38);
  --atmos-dot-bright: rgba(14, 165, 233, 0.42);
  --atmos-bokeh: rgba(59, 130, 246, 0.14);
  --atmos-bokeh-2: rgba(16, 185, 129, 0.12);
  --atmos-dots-opacity: 0.95;
}

html.dark-theme,
.dark-theme {
  --bg: #0f1419;
  --atmos-wash-1: rgba(96, 165, 250, 0.18);
  --atmos-wash-2: rgba(52, 211, 153, 0.12);
  --atmos-wash-3: rgba(129, 140, 248, 0.1);
  --atmos-wash-4: transparent;
  --atmos-dot: rgba(226, 232, 240, 0.45);
  --atmos-dot-bright: rgba(255, 255, 255, 0.32);
  --atmos-bokeh: transparent;
  --atmos-bokeh-2: transparent;
  --atmos-dots-opacity: 0.9;
}

body.problem-page {
  --atmos-wash-1: rgba(56, 189, 248, 0.14);
  --atmos-wash-2: rgba(52, 211, 153, 0.1);
  --atmos-wash-3: rgba(96, 165, 250, 0.08);
  --atmos-wash-4: rgba(125, 211, 252, 0.08);
  --atmos-bokeh: rgba(59, 130, 246, 0.07);
  --atmos-bokeh-2: rgba(16, 185, 129, 0.06);
  --atmos-dots-opacity: 0.55;
}

html.dark-theme body.problem-page,
body.dark-theme.problem-page {
  --atmos-wash-1: rgba(96, 165, 250, 0.1);
  --atmos-wash-2: rgba(52, 211, 153, 0.06);
  --atmos-wash-3: rgba(129, 140, 248, 0.05);
  --atmos-wash-4: transparent;
  --atmos-bokeh: transparent;
  --atmos-bokeh-2: transparent;
  --atmos-dots-opacity: 0.6;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 90% 55% at 5% 0%, var(--atmos-wash-1), transparent 58%),
    radial-gradient(ellipse 75% 50% at 100% 8%, var(--atmos-wash-2), transparent 52%),
    radial-gradient(ellipse 65% 45% at 88% 100%, var(--atmos-wash-3), transparent 55%),
    radial-gradient(ellipse 55% 40% at 8% 92%, var(--atmos-wash-2), transparent 50%),
    radial-gradient(ellipse 45% 35% at 48% 35%, var(--atmos-wash-4), transparent 62%),
    /* soft light-only bokeh orbs */
    radial-gradient(circle 140px at 22% 28%, var(--atmos-bokeh), transparent 70%),
    radial-gradient(circle 110px at 78% 22%, var(--atmos-bokeh-2), transparent 70%),
    radial-gradient(circle 160px at 68% 78%, var(--atmos-bokeh), transparent 72%),
    radial-gradient(circle 100px at 30% 72%, var(--atmos-bokeh-2), transparent 70%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: var(--atmos-dots-opacity);
  background-image:
    radial-gradient(1.6px 1.6px at 20px 28px, var(--atmos-dot), transparent),
    radial-gradient(1.3px 1.3px at 72px 96px, var(--atmos-dot-bright), transparent),
    radial-gradient(1.8px 1.8px at 140px 48px, var(--atmos-dot), transparent),
    radial-gradient(1.4px 1.4px at 52px 158px, var(--atmos-dot-bright), transparent),
    radial-gradient(1.2px 1.2px at 176px 132px, var(--atmos-dot), transparent),
    radial-gradient(1.7px 1.7px at 104px 184px, var(--atmos-dot-bright), transparent),
    radial-gradient(1.3px 1.3px at 16px 124px, var(--atmos-dot), transparent),
    radial-gradient(1.5px 1.5px at 158px 18px, var(--atmos-dot-bright), transparent),
    /* larger soft sparkles — читаются на светлом лучше серой пыли */
    radial-gradient(circle 3px at 40px 70px, var(--atmos-dot-bright), transparent 70%),
    radial-gradient(circle 2.5px at 120px 160px, var(--atmos-dot), transparent 70%),
    radial-gradient(circle 3.2px at 180px 60px, var(--atmos-dot-bright), transparent 70%);
  background-size: 200px 210px, 200px 210px, 200px 210px, 200px 210px,
    200px 210px, 200px 210px, 200px 210px, 200px 210px,
    240px 250px, 260px 270px, 280px 260px;
  background-repeat: repeat;
}

main {
  position: relative;
  z-index: 1;
}

@media (prefers-reduced-motion: reduce) {
  body::after {
    opacity: calc(var(--atmos-dots-opacity) * 0.75);
  }
}

/* ========================================
   КОНТЕЙНЕРЫ И МАКЕТ
   ======================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Специальный стиль для страницы с задачами - убираем центрирование */
.problem-page .container {
  max-width: none !important;
  margin: 0 !important;
  padding: 0 var(--spacing-lg) !important;
}

.problem-page .layout-adaptive {
  max-width: none !important;
  margin: 0 !important;
  padding: 0 2rem !important;
}

.problem-page .content-wrapper {
  justify-content: flex-start !important;
}

.problem-page .content-wrapper .content {
  max-width: none !important;
}

/* Подсветка страницы при успешном/неуспешном решении */
.problem-page.solution-success {
  animation: flashGreen 1s ease-out;
}

.problem-page.solution-failed {
  animation: flashRed 1s ease-out;
}

@keyframes flashGreen {
  0% {
    background-color: rgba(40, 167, 69, 0.3);
  }
  50% {
    background-color: rgba(40, 167, 69, 0.5);
  }
  100% {
    background-color: transparent;
  }
}

@keyframes flashRed {
  0% {
    background-color: rgba(220, 53, 69, 0.3);
  }
  50% {
    background-color: rgba(220, 53, 69, 0.5);
  }
  100% {
    background-color: transparent;
  }
}

.dark-theme.problem-page.solution-success {
  animation: flashGreenDark 1s ease-out;
}

.dark-theme.problem-page.solution-failed {
  animation: flashRedDark 1s ease-out;
}

@keyframes flashGreenDark {
  0% {
    background-color: rgba(40, 167, 69, 0.2);
  }
  50% {
    background-color: rgba(40, 167, 69, 0.3);
  }
  100% {
    background-color: transparent;
  }
}

@keyframes flashRedDark {
  0% {
    background-color: rgba(220, 53, 69, 0.2);
  }
  50% {
    background-color: rgba(220, 53, 69, 0.3);
  }
  100% {
    background-color: transparent;
  }
}

/* Стили для результатов в правой колонке */
.problem-sandbox .results-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.problem-sandbox .results-section h3 {
  margin-bottom: 1rem;
  font-size: 1.1rem;
  color: var(--text);
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr 320px;
  gap: var(--spacing-xl);
  min-height: calc(100vh - 80px);
}

.layout-adaptive {
  display: flex;
  gap: var(--spacing-xl);
  min-height: calc(100vh - 80px);
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.content-wrapper {
  flex: 1;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.content-wrapper .content {
  width: 100%;
  max-width: 1000px;
}

.content {
  padding: var(--spacing-xl) 0;
}

.sidebar {
  position: sticky;
  top: var(--spacing-lg);
  align-self: start;
  padding: var(--spacing-lg) 0;
}

/* ========================================
   НАВИГАЦИЯ
   ======================================== */

.nav {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: var(--spacing-lg) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-family);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  transition: color 0.2s ease;
  margin-right: 0.25rem;
}

.brand:hover {
  color: var(--primary);
}

.nav-interview {
  color: #b45309 !important;
  border-color: rgba(245, 158, 11, 0.35) !important;
}

.nav-interview:hover {
  background: rgba(245, 158, 11, 0.12) !important;
  color: #92400e !important;
}

.dark-theme .nav-interview {
  color: #fbbf24 !important;
}

.dark-theme .nav-interview:hover {
  color: #fcd34d !important;
  background: rgba(245, 158, 11, 0.14) !important;
}

.home-interview-cta {
  max-width: 1100px;
  margin: 1.25rem auto 0;
  padding: 0.85rem 1.1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel, #fff);
}

.home-interview-cta-text {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 42rem;
  line-height: 1.45;
}

.dark-theme .home-interview-cta {
  background: rgba(255, 255, 255, 0.03);
}

.spacer {
  flex: 1;
}

.search {
  display: flex;
  align-items: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--spacing-sm) var(--spacing-md);
  min-width: 300px;
  transition: border-color 0.2s ease;
}

.search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.search input {
  border: none;
  background: none;
  outline: none;
  font-size: 0.9rem;
  width: 100%;
}

.search input::placeholder {
  color: #64748b;
  opacity: 1;
}

/* ========================================
   КНОПКИ
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-family: var(--font-family);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.9rem;
  white-space: nowrap;
  -webkit-font-smoothing: antialiased;
}

.btn:not(.secondary) {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.btn:not(.secondary):hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--shadow);
}

.btn.secondary {
  background: var(--bg-secondary);
  color: var(--text);
  border-color: var(--border);
}

.btn.secondary:hover {
  background: var(--bg);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.actions {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  flex-wrap: wrap;
}

/* ========================================
   ФОРМЫ
   ======================================== */

.form {
  display: grid;
  gap: var(--spacing-lg);
  max-width: 600px;
}

label {
  display: grid;
  gap: var(--spacing-sm);
  font-weight: 500;
  color: var(--text);
}

input, textarea, select {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 1rem;
  transition: all 0.2s ease;
  font-family: var(--font-family);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

textarea {
  min-height: 120px;
  resize: vertical;
  font-family: var(--font-mono);
}

input[type="file"] {
  padding: var(--spacing-sm);
}

/* ========================================
   ТИПОГРАФИКА
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  margin: 0 0 var(--spacing-lg) 0;
  color: var(--text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.muted {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Тихие текстовые ссылки: читаемы в dark, без фиолетового :visited */
a.muted,
a.muted:link,
a.muted:visited,
.muted a,
.muted a:link,
.muted a:visited,
.quiet-link,
.quiet-link:link,
.quiet-link:visited,
.back,
.back:link,
.back:visited,
.section-link,
.section-link:link,
.section-link:visited,
.continue-strip-label-link,
.continue-strip-label-link:link,
.continue-strip-label-link:visited,
.site-footer a,
.site-footer a:link,
.site-footer a:visited,
.interview-hub-secondary a,
.interview-hub-secondary a:link,
.interview-hub-secondary a:visited,
.auth-footer a,
.auth-footer a:link,
.auth-footer a:visited,
.auth-extra-link,
.auth-extra-link:link,
.auth-extra-link:visited,
.privacy-inline-link,
.privacy-inline-link:link,
.privacy-inline-link:visited {
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

a.muted:hover,
a.muted:focus-visible,
.muted a:hover,
.muted a:focus-visible,
.quiet-link:hover,
.quiet-link:focus-visible,
.back:hover,
.back:focus-visible,
.section-link:hover,
.section-link:focus-visible,
.continue-strip-label-link:hover,
.continue-strip-label-link:focus-visible,
.site-footer a:hover,
.site-footer a:focus-visible,
.interview-hub-secondary a:hover,
.interview-hub-secondary a:focus-visible,
.auth-footer a:hover,
.auth-footer a:focus-visible,
.auth-extra-link:hover,
.auth-extra-link:focus-visible,
.privacy-inline-link:hover,
.privacy-inline-link:focus-visible {
  color: var(--text);
  border-bottom-color: color-mix(in srgb, var(--text) 35%, transparent);
}

.back {
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.section-link {
  font-weight: 500;
}

/* ========================================
   КАРТОЧКИ И ПАНЕЛИ
   ======================================== */

.card, .panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all 0.2s ease;
  text-align: left;
}

.card:hover, .panel:hover {
  border-color: var(--border-hover);
  box-shadow: 0 4px 12px var(--shadow);
  transform: translateY(-2px);
}

.cards {
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ========================================
   ЗАДАЧИ И КАРТОЧКИ ЗАДАЧ
   ======================================== */

.task-card {
  display: block;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  color: var(--text);
  text-decoration: none;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.task-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--border);
  transition: background-color 0.2s ease;
}

.task-card.easy::before { background: var(--accent); }
.task-card.medium::before { background: var(--warning); }
.task-card.hard::before { background: var(--danger); }

.task-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--shadow-hover);
}

.task-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.task-card-title {
  font-weight: 600;
  font-size: 1.1rem;
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
}

.task-card-status {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border);
}

.cards.tasks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

/* ========================================
   БЕЙДЖИ И МЕТКИ
   ======================================== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.badge.easy {
  background: var(--accent-light);
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.badge.medium {
  background: var(--warning-light);
  color: #92400e;
  border: 1px solid #fde68a;
}

.badge.hard {
  background: var(--danger-light);
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* ========================================
   СТАТУСЫ
   ======================================== */

.ok {
  color: var(--accent);
  font-weight: 600;
  font-size: 1.1rem;
}

.bad {
  color: var(--danger);
  font-weight: 600;
  font-size: 1.1rem;
}

/* ========================================
   ТАБЛИЦЫ
   ======================================== */

.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 1px 3px var(--shadow);
}

.table th,
.table td {
  padding: var(--spacing-lg);
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.table th {
  background: var(--bg);
  font-weight: 600;
  color: var(--text);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.table tbody tr:hover {
  background: var(--bg);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.table a:not(.btn),
.table a:not(.btn):link,
.table a:not(.btn):visited {
  color: var(--text);
  text-decoration: none;
}

.table a:not(.btn):hover,
.table a:not(.btn):focus-visible {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 0.12em;
}

/* ========================================
   СПИСКИ
   ======================================== */

.list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.list li {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.list li:last-child {
  border-bottom: none;
}

/* ========================================
   УВЕДОМЛЕНИЯ
   ======================================== */

.flash {
  list-style: none;
  padding: 0;
  margin: var(--spacing-lg) 0;
}

.flash li {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-md);
  font-weight: 500;
}

.flash .success {
  background: var(--accent-light);
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.flash .error {
  background: var(--danger-light);
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* ========================================
   ГЛАВНАЯ СТРАНИЦА
   ======================================== */

.hero {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="%23ffffff" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="%23ffffff" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  pointer-events: none;
}

.hero-text {
  position: relative;
  z-index: 1;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  color: var(--text);
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

/* ========================================
   ВКЛАДКИ
   ======================================== */

.tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--spacing-sm);
}

.tab {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius) var(--radius) 0 0;
  border: 1px solid transparent;
  text-decoration: none;
  color: var(--text-muted);
  background: transparent;
  font-weight: 500;
  transition: all 0.2s ease;
  position: relative;
}

.tab:hover {
  color: var(--text);
  background: var(--bg);
}

.tab.active {
  color: var(--primary);
  background: var(--bg-secondary);
  border-color: var(--border);
  border-bottom-color: var(--bg-secondary);
  margin-bottom: -1px;
}

/* ========================================
   АККОРДЕОН
   ======================================== */

.accordion {
  display: grid;
  gap: var(--spacing-md);
}

.acc-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  overflow: hidden;
  transition: all 0.2s ease;
}

.acc-item:hover {
  border-color: var(--border-hover);
  box-shadow: 0 2px 8px var(--shadow);
}

.acc-item.open {
  box-shadow: 0 4px 16px var(--shadow-hover);
}

.acc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  cursor: pointer;
}

.acc-link {
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  font-size: 1.1rem;
  transition: color 0.2s ease;
}

.acc-link:hover {
  color: var(--primary);
}

.acc-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.acc-toggle {
  background: var(--primary-light);
  border: 1px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
  cursor: pointer;
  color: var(--primary);
  font-size: 0.8rem;
  transition: all 0.2s ease;
}

.acc-toggle:hover {
  background: var(--primary);
  color: white;
}

.acc-panel {
  border-top: 1px solid var(--border);
  padding: var(--spacing-lg);
  display: none;
}

.acc-panel.open {
  display: block;
}

.acc-loading {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-muted);
}

.level-menu {
  display: flex;
  gap: var(--spacing-sm);
  margin: var(--spacing-lg) 0;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 999px;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  background: var(--bg);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.chip:hover {
  background: var(--bg-secondary);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.chip.easy {
  background: var(--accent-light);
  border-color: #a7f3d0;
  color: #065f46;
}

.chip.medium {
  background: var(--warning-light);
  border-color: #fde68a;
  color: #92400e;
}

.chip.hard {
  background: var(--danger-light);
  border-color: #fecaca;
  color: #991b1b;
}

.level-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin: var(--spacing-lg) 0 var(--spacing-md) 0;
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border);
}

.acc-actions {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
}

/* ========================================
   ДЕРЕВО КАТЕГОРИЙ
   ======================================== */

.category-tree {
  margin-top: var(--spacing-md);
}

.category-group {
  margin-bottom: var(--spacing-md);
}

.category-header {
  display: flex;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.2s ease;
  font-weight: 500;
}

.category-header:hover {
  background: var(--bg-secondary);
  border-color: var(--border-hover);
}

.category-header.expanded {
  background: var(--primary-light);
  border-color: var(--primary);
}

.category-name {
  flex: 1;
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}

.category-name.current {
  color: var(--primary);
  font-weight: 600;
}

.category-count {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 0 var(--spacing-md);
}

.toggle-icon {
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.toggle-icon:hover {
  color: var(--primary);
}

.category-levels {
  margin-top: var(--spacing-sm);
  padding-left: var(--spacing-lg);
  display: none;
}

.category-levels.expanded {
  display: block;
}

.level-group {
  margin-bottom: var(--spacing-md);
}

.level-header {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg);
  border-radius: var(--radius-sm);
}

.level-tasks {
  list-style: none;
  padding: 0;
  margin: 0;
}

.level-tasks li {
  margin-bottom: var(--spacing-xs);
}

.task-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.task-link:hover {
  background: var(--bg);
  color: var(--text);
}

/* ========================================
   ЛИДЕРБОРД
   ======================================== */

.leaderboard-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: all 0.2s ease;
  position: relative;
}

.leaderboard-item:hover {
  border-color: var(--border-hover);
  box-shadow: 0 4px 16px var(--shadow);
  transform: translateY(-2px);
}

.leaderboard-item.podium-1 {
  background: linear-gradient(135deg, #fff6c8, #ffe98a);
  border-color: #f0c14b;
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.18);
}

.leaderboard-item.podium-2 {
  background: linear-gradient(135deg, #eceff3, #d8dde5);
  border-color: #b0b8c4;
  box-shadow: 0 6px 20px rgba(148, 163, 184, 0.18);
}

.leaderboard-item.podium-3 {
  background: linear-gradient(135deg, #f3d7b5, #e8c08a);
  border-color: #d4a574;
  box-shadow: 0 6px 20px rgba(217, 119, 6, 0.16);
}

.rank {
  font-size: 1.5rem;
  font-weight: 700;
  min-width: 60px;
  text-align: center;
  color: var(--text);
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
  min-width: 0;
}

.avatar-leaderboard {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
  transition: border-color 0.2s ease;
}

.avatar-placeholder-small {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--border);
  font-size: 1.5rem;
}

.leaderboard-item:hover .avatar-leaderboard {
  border-color: var(--primary);
}

.user-details {
  flex: 1;
  min-width: 0;
}

.username {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text);
  margin-bottom: var(--spacing-xs);
}

.username a,
.username a:link,
.username a:visited {
  color: inherit;
  text-decoration: none;
}

.username a:hover,
.username a:focus-visible {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 0.12em;
}

/* На подиуме ники всегда тёмные — градиент светлый */
.leaderboard-item.podium-1 .username,
.leaderboard-item.podium-1 .username a,
.leaderboard-item.podium-1 .username a:visited,
.leaderboard-item.podium-1 .rank,
.leaderboard-item.podium-2 .username,
.leaderboard-item.podium-2 .username a,
.leaderboard-item.podium-2 .username a:visited,
.leaderboard-item.podium-2 .rank,
.leaderboard-item.podium-3 .username,
.leaderboard-item.podium-3 .username a,
.leaderboard-item.podium-3 .username a:visited,
.leaderboard-item.podium-3 .rank {
  color: #1f2937;
}

.leaderboard-item.podium-1 .points,
.leaderboard-item.podium-2 .points,
.leaderboard-item.podium-3 .points {
  color: #1d4ed8;
}

.leaderboard-item.podium-1 .solved,
.leaderboard-item.podium-2 .solved,
.leaderboard-item.podium-3 .solved {
  color: #4b5563;
}

.user-stats {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.9rem;
}

.points {
  color: var(--primary);
  font-weight: 600;
}

.solved {
  color: var(--text-muted);
}

.achievement {
  display: flex;
  align-items: center;
}

.achievement-badge {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.achievement-badge.gold {
  background: linear-gradient(135deg, #ffd700, #ffed4e);
  color: #92400e;
  border: 1px solid #f59e0b;
}

.achievement-badge.silver {
  background: linear-gradient(135deg, #c0c0c0, #e5e7eb);
  color: #374151;
  border: 1px solid #9ca3af;
}

.achievement-badge.bronze {
  background: linear-gradient(135deg, #cd7f32, #fbbf24);
  color: #92400e;
  border: 1px solid #d97706;
}

/* Боковой лидерборд для сайдбара */
.leader {
  margin: 0;
  padding-left: var(--spacing-lg);
}

.leader li {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all 0.2s ease;
}

.leader li:hover {
  border-color: var(--border-hover);
  box-shadow: 0 2px 8px var(--shadow);
}

.leader li:nth-child(1) {
  background: linear-gradient(135deg, #ffd700, #ffed4e);
  border-color: #f59e0b;
}

.leader li:nth-child(2) {
  background: linear-gradient(135deg, #c0c0c0, #e5e7eb);
  border-color: #9ca3af;
}

.leader li:nth-child(3) {
  background: linear-gradient(135deg, #cd7f32, #fbbf24);
  border-color: #d97706;
}

.avatar-sm {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
  transition: border-color 0.2s ease;
}

.leader li:hover .avatar-sm {
  border-color: var(--primary);
}

/* ========================================
   ПРОФИЛЬ
   ======================================== */

.profile-header {
  display: flex;
  gap: var(--spacing-xl);
  align-items: flex-start;
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.avatar-large {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--border);
  box-shadow: 0 4px 16px var(--shadow);
}

.avatar-placeholder {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-weight: 500;
  border: 4px solid var(--border);
}

.profile-info {
  flex: 1;
}

.profile-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.stat-card {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

/* ========================================
   ПОИСК
   ======================================== */

.search-form {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.search-form input {
  flex: 1;
}

.search-form select {
  min-width: 150px;
}

.search-form button {
  min-width: 100px;
}

/* ========================================
   ПРЕВЬЮ АВАТАРА
   ======================================== */

.avatar-preview {
  margin-top: var(--spacing-md);
  display: flex;
  justify-content: center;
}

/* ========================================
   ЦЕНТРИРОВАННЫЙ КОНТЕНТ
   ======================================== */

.content-centered {
  max-width: 900px;
  margin: 0 auto;
}

.tabs-centered {
  justify-content: center;
}

/* ========================================
   СПЕЦИАЛЬНЫЕ СТИЛИ ДЛЯ СТРАНИЦ
   ======================================== */

/* Стили для страницы логина */
.login-page .panel {
  padding: var(--spacing-xl);
  margin: 0 auto;
  max-width: 400px;
}

/* Стили для страницы задач */
.problems-page .problems-header {
  padding-left: 0;
  margin-left: 0;
}

.problems-page .problems-list {
  padding-left: 0;
  margin-left: 0;
}

.problems-page .problem-item {
  padding: 1rem;
  margin-left: 0;
}

.problems-page .topics-filter {
  padding-left: 0;
  margin-left: 0;
}

.problems-page .topics-buttons {
  padding-left: 0;
  margin-left: 0;
}

/* ========================================
   ТЕМНАЯ ТЕМА
   ======================================== */

/* Предотвращение моргания при загрузке */
html {
  transition: none !important;
}

body {
  transition: none !important;
}

/* Применяем темную тему сразу для предотвращения моргания */
.dark-theme,
.dark-theme * {
  transition: none !important;
}

/* Скрываем контент до применения темы */
body:not(.loaded) {
  visibility: hidden;
}

body.loaded {
  visibility: visible;
  transition: all 0.3s ease;
}

body.loaded * {
  transition: all 0.3s ease;
}

/* Предотвращение моргания навигации */
.nav {
  transition: none !important;
}

body.loaded .nav {
  transition: all 0.3s ease;
}

/* Предотвращение моргания кнопок */
.btn {
  transition: none !important;
}

body.loaded .btn {
  transition: all 0.3s ease;
}

/* Предотвращение моргания на мобильных устройствах */
@media (max-width: 768px) {
  body:not(.loaded) {
    opacity: 0;
  }
  
  body.loaded {
    opacity: 1;
    transition: opacity 0.2s ease;
  }
}

/* Дополнительная защита от моргания */
.dark-theme .nav,
.dark-theme .card,
.dark-theme .panel,
.dark-theme .btn,
.dark-theme input,
.dark-theme textarea,
.dark-theme select {
  transition: none !important;
}

body.loaded .dark-theme .nav,
body.loaded .dark-theme .card,
body.loaded .dark-theme .panel,
body.loaded .dark-theme .btn,
body.loaded .dark-theme input,
body.loaded .dark-theme textarea,
body.loaded .dark-theme select {
  transition: all 0.3s ease;
}

/* Темная тема для всего сайта */
.dark-theme,
html.dark-theme {
  --primary: #60a5fa;
  --primary-hover: #3b82f6;
  --primary-light: rgba(96, 165, 250, 0.16);
  --focus-ring: rgba(96, 165, 250, 0.35);
  --bg: #0f1419;
  --bg-secondary: #171c22;
  --text: #e8edf2;
  --text-muted: #9aa7b5;
  --border: #2a3340;
  --border-hover: #3d4a5c;
  --shadow: rgba(0, 0, 0, 0.45);
  --shadow-hover: rgba(0, 0, 0, 0.55);
}

/* Принудительное применение темной темы ко всем элементам.
   НЕ используем html.dark-theme * — иначе цвет насильно
   перетирает текст на цветных фонах (hero, CTA, badges). */
html.dark-theme body {
  color: var(--text);
  background: var(--bg);
}

.dark-theme .nav,
html.dark-theme .nav {
  background: var(--bg-secondary);
  border-bottom-color: var(--border);
}

.dark-theme .card,
.dark-theme .panel {
  background: var(--bg-secondary);
  border-color: var(--border);
}

.dark-theme .search {
  background: var(--bg);
  border-color: var(--border);
}

.dark-theme .search input {
  color: var(--text);
}

.dark-theme .search input::placeholder {
  color: var(--text-muted);
}

.dark-theme .btn.secondary {
  background: var(--bg-secondary);
  color: var(--text);
  border-color: var(--border);
}

.dark-theme .btn.secondary:hover {
  background: #1e252e;
  border-color: var(--border-hover);
  color: var(--text);
}

.dark-theme .btn:not(.secondary) {
  color: #0b1220;
  background: var(--primary);
  border-color: var(--primary);
}

.dark-theme .btn:not(.secondary):hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: #0b1220;
}

.dark-theme .nav-dropdown-menu {
  background: var(--bg-secondary);
  border-color: var(--border);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
}

.dark-theme .nav-dropdown-menu a:hover {
  background: #1e252e;
}

.dark-theme input,
.dark-theme textarea,
.dark-theme select {
  background: var(--bg-secondary);
  color: var(--text);
  border-color: var(--border);
}

.dark-theme input:focus,
.dark-theme textarea:focus,
.dark-theme select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.dark-theme .table {
  background: var(--bg-secondary);
}

.dark-theme .table th {
  background: var(--bg);
  color: var(--text);
}

.dark-theme .table tbody tr:hover {
  background: var(--bg);
}

.dark-theme .leaderboard-item {
  background: var(--bg-secondary);
  border-color: var(--border);
}

.dark-theme .leaderboard-item:hover {
  border-color: var(--border-hover);
}

.dark-theme .leaderboard-item .username,
.dark-theme .leaderboard-item .username a,
.dark-theme .leaderboard-item .username a:visited {
  color: var(--text);
}

.dark-theme .leaderboard-item.podium-1 {
  background: linear-gradient(135deg, #3a3118, #4a3d1c);
  border-color: rgba(245, 158, 11, 0.45);
  box-shadow: none;
}

.dark-theme .leaderboard-item.podium-2 {
  background: linear-gradient(135deg, #2a3038, #343b45);
  border-color: rgba(148, 163, 184, 0.35);
  box-shadow: none;
}

.dark-theme .leaderboard-item.podium-3 {
  background: linear-gradient(135deg, #3a2c1c, #4a3720);
  border-color: rgba(217, 119, 6, 0.4);
  box-shadow: none;
}

.dark-theme .leaderboard-item.podium-1 .username,
.dark-theme .leaderboard-item.podium-1 .username a,
.dark-theme .leaderboard-item.podium-1 .username a:visited,
.dark-theme .leaderboard-item.podium-1 .rank,
.dark-theme .leaderboard-item.podium-2 .username,
.dark-theme .leaderboard-item.podium-2 .username a,
.dark-theme .leaderboard-item.podium-2 .username a:visited,
.dark-theme .leaderboard-item.podium-2 .rank,
.dark-theme .leaderboard-item.podium-3 .username,
.dark-theme .leaderboard-item.podium-3 .username a,
.dark-theme .leaderboard-item.podium-3 .username a:visited,
.dark-theme .leaderboard-item.podium-3 .rank {
  color: #f3f4f6;
}

.dark-theme .leaderboard-item.podium-1 .points,
.dark-theme .leaderboard-item.podium-2 .points,
.dark-theme .leaderboard-item.podium-3 .points {
  color: #93c5fd;
}

.dark-theme .leaderboard-item.podium-1 .solved,
.dark-theme .leaderboard-item.podium-2 .solved,
.dark-theme .leaderboard-item.podium-3 .solved {
  color: #9aa7b5;
}

.dark-theme .problem-item {
  background: var(--bg-secondary);
  border-color: var(--border);
}

.dark-theme .problem-item:hover {
  border-color: var(--primary);
}

.dark-theme .description-text {
  background: var(--bg);
  border-color: var(--border);
  color: var(--text);
}

.dark-theme .example-section,
.dark-theme .constraints-section,
.dark-theme .followup-section {
  background: var(--bg-secondary);
  border-color: var(--border);
}

.dark-theme .code-block {
  background: var(--bg);
  border-color: var(--border);
}

.dark-theme .code-block pre {
  color: var(--text);
}

.dark-theme .input-output,
.dark-theme .code-snippet,
.dark-theme .constraint-item,
.dark-theme .example-text {
  background: var(--bg);
  border-color: var(--border);
  color: var(--text);
}

.dark-theme .result-item {
  background: var(--bg);
  border-color: var(--border);
}

/* Стили для примеров и ограничений в темной теме */
.dark-theme .example-item,
html.dark-theme .example-item {
  background: var(--bg-secondary) !important;
  border-left-color: var(--primary) !important;
}

.dark-theme .example-code,
html.dark-theme .example-code,
.dark-theme code,
html.dark-theme code {
  background: var(--bg) !important;
  border-color: var(--border) !important;
  color: var(--text) !important;
}

.dark-theme .example-row strong,
html.dark-theme .example-row strong {
  color: var(--text-muted) !important;
}

.dark-theme .example-explanation,
html.dark-theme .example-explanation {
  border-top-color: var(--border) !important;
  color: var(--text-muted) !important;
}

.dark-theme .constraints-text,
html.dark-theme .constraints-text {
  background: var(--bg-secondary) !important;
  border-left-color: var(--warning) !important;
  color: var(--text) !important;
}

/* Стили для результатов тестирования в темной теме */
.dark-theme .result-item,
html.dark-theme .result-item {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: rgba(239, 68, 68, 0.3) !important;
  color: #fca5a5 !important;
}

.dark-theme .result-item code,
html.dark-theme .result-item code,
.dark-theme .result-item .test-output-code,
html.dark-theme .result-item .test-output-code,
.dark-theme .result-item pre,
html.dark-theme .result-item pre,
.dark-theme .result-item .test-traceback,
html.dark-theme .result-item .test-traceback {
  background: var(--bg-secondary) !important;
  color: var(--text) !important;
  border-color: var(--border) !important;
}

.dark-theme .example-label,
html.dark-theme .example-label {
  color: var(--text-muted) !important;
}

.dark-theme .success-result,
html.dark-theme .success-result {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.2) 0%, rgba(34, 197, 94, 0.15) 100%) !important;
  border-color: rgba(34, 197, 94, 0.4) !important;
  color: #86efac !important;
}

.dark-theme .performance-chart,
html.dark-theme .performance-chart {
  background: var(--bg-secondary) !important;
  border-color: var(--border) !important;
}

.dark-theme .performance-chart h4,
html.dark-theme .performance-chart h4,
.dark-theme .performance-chart div,
html.dark-theme .performance-chart div {
  color: var(--text) !important;
}

.dark-theme .performance-charts,
html.dark-theme .performance-charts {
  color: var(--text) !important;
}

.dark-theme .performance-chart strong,
html.dark-theme .performance-chart strong {
  color: var(--text) !important;
}

/* Переопределение цветов в инлайн стилях для графиков производительности */
.dark-theme .performance-chart [style*="color: #1e293b"],
html.dark-theme .performance-chart [style*="color: #1e293b"],
.dark-theme .performance-chart [style*="color: #64748b"],
html.dark-theme .performance-chart [style*="color: #64748b"] {
  color: var(--text) !important;
}

.dark-theme .performance-chart [style*="color: #64748b"],
html.dark-theme .performance-chart [style*="color: #64748b"] {
  color: var(--text-muted) !important;
}

/* Стили для комментариев */
.comments-section {
  max-width: 1200px;
  margin: 0 auto;
}

.comment-item {
  transition: all 0.2s ease;
}

.comment-item:hover {
  border-color: var(--border-hover);
  box-shadow: 0 2px 8px var(--shadow);
}

.comment-form textarea {
  transition: border-color 0.2s ease;
}

.comment-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.dark-theme .comment-item,
html.dark-theme .comment-item {
  background: var(--bg-secondary) !important;
  border-color: var(--border) !important;
}

.dark-theme .comment-form textarea,
html.dark-theme .comment-form textarea {
  background: var(--bg-secondary) !important;
  border-color: var(--border) !important;
  color: var(--text) !important;
}

.dark-theme .comment-form textarea::placeholder,
html.dark-theme .comment-form textarea::placeholder {
  color: var(--text-muted) !important;
}

/* Стили для реакций на комментарии */
.reaction-btn:hover {
  background: var(--bg) !important;
  border-color: var(--primary) !important;
  transform: translateY(-1px);
}

.reaction-btn.like-btn.active {
  background: rgba(34, 197, 94, 0.1) !important;
  border-color: #22c55e !important;
  color: #22c55e !important;
}

.reaction-btn.dislike-btn.active {
  background: rgba(239, 68, 68, 0.1) !important;
  border-color: #ef4444 !important;
  color: #ef4444 !important;
}

.reaction-form {
  display: inline;
}

.comment-reactions {
  margin-top: 0.5rem;
}

.dark-theme .reaction-btn,
html.dark-theme .reaction-btn {
  background: var(--bg-secondary) !important;
  border-color: var(--border) !important;
  color: var(--text-muted) !important;
}

.dark-theme .reaction-btn:hover,
html.dark-theme .reaction-btn:hover {
  background: var(--bg) !important;
  border-color: var(--primary) !important;
}

/* Стили для редактирования комментариев */
.edit-comment-btn:hover {
  text-decoration: underline;
}

.comment-edit-form textarea {
  transition: border-color 0.2s ease;
}

.comment-edit-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.dark-theme .comment-edit-form textarea,
html.dark-theme .comment-edit-form textarea {
  background: var(--bg-secondary) !important;
  border-color: var(--border) !important;
  color: var(--text) !important;
}

/* Стили для подсказок */
.hint-toggle:hover {
  background: var(--bg) !important;
}

.hint-item {
  transition: all 0.2s ease;
}

.hint-item:hover {
  border-color: var(--border-hover);
}

.dark-theme .hint-item,
html.dark-theme .hint-item {
  background: var(--bg-secondary) !important;
  border-color: var(--border) !important;
}

.dark-theme .hint-toggle,
html.dark-theme .hint-toggle {
  color: var(--text) !important;
}

.dark-theme .hint-toggle:hover,
html.dark-theme .hint-toggle:hover {
  background: var(--bg) !important;
}

.dark-theme .hint-content,
html.dark-theme .hint-content {
  border-top-color: var(--border) !important;
  color: var(--text) !important;
}

/* CodeMirror стили - адаптируются к теме сайта */
.CodeMirror {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  background: var(--bg-secondary);
  color: var(--text);
  height: auto;
  min-height: 500px;
  direction: ltr;
  text-align: left;
  width: 100%;
  max-width: none;
}

/* Контейнер для редактора */
.code-editor-container {
  position: relative;
  width: 100%;
  min-height: 500px;
}

/* Исправление смещения текста при переключении языков */
.CodeMirror .CodeMirror-lines {
  padding: 0;
  margin: 0;
}

.CodeMirror .CodeMirror-line {
  padding: 0;
  margin: 0;
}

.CodeMirror .CodeMirror-code {
  padding: 0;
  margin: 0;
}

.CodeMirror .CodeMirror-cursor {
  left: 0;
  top: 0;
}

/* Дополнительные исправления для смещения текста */
.CodeMirror .CodeMirror-scroll {
  margin: 0;
  padding: 0;
}

.CodeMirror .CodeMirror-sizer {
  margin: 0;
  padding: 0;
}

.CodeMirror .CodeMirror-gutter {
  margin: 0;
  padding: 0;
}

.CodeMirror .CodeMirror-gutter-wrapper {
  margin: 0;
  padding: 0;
}

.CodeMirror .CodeMirror-gutter-elt {
  margin: 0;
  padding: 0;
}

/* Убраны span-level direction/unicode-bidi — ломали копирование в CodeMirror */

/* Исправление для всех языков */
.CodeMirror.cm-s-default,
.CodeMirror.cm-s-monokai,
.CodeMirror.cm-s-solarized-light,
.CodeMirror.cm-s-github {
  direction: ltr !important;
  text-align: left !important;
  unicode-bidi: normal !important;
}

/* Дополнительные исправления для смещения */
.CodeMirror {
  position: relative !important;
  left: 0 !important;
  top: 0 !important;
  transform: none !important;
  margin: 0 !important;
  padding: 0 !important;
}

.CodeMirror .CodeMirror-scroll {
  position: relative !important;
  left: 0 !important;
  top: 0 !important;
  transform: none !important;
}

.CodeMirror .CodeMirror-sizer {
  position: relative !important;
  left: 0 !important;
  top: 0 !important;
  transform: none !important;
}

.CodeMirror .CodeMirror-gutter {
  position: relative !important;
  left: 0 !important;
  top: 0 !important;
  transform: none !important;
}

/* Принудительное выравнивание — только на уровне редактора, не на каждом span
   (иначе Ctrl+C копирует пустоту/пробелы из-за unicode-bidi) */
.problem-page .CodeMirror {
  direction: ltr !important;
  text-align: left !important;
}

/* НЕ трогаем внутренний textarea CodeMirror — он отвечает за копирование */
.problem-page .CodeMirror textarea {
  position: absolute !important;
  left: 0 !important;
  top: 0 !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: 0 !important;
  opacity: 0 !important;
  z-index: -1 !important;
  resize: none !important;
}

/* Исправление для контейнеров редакторов */
.code-editor {
  position: relative !important;
  left: 0 !important;
  top: 0 !important;
  transform: none !important;
  margin: 0 !important;
  padding: 0 !important;
  width: 100% !important;
  overflow: visible !important;
}

/* Старый textarea до инициализации CM (не внутренний скрытый input) */
.code-editor-container > textarea#code-python3 {
  width: 100%;
  direction: ltr;
  text-align: left;
}

.CodeMirror-focused {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.CodeMirror-gutters {
  background: var(--bg);
  border-right: 1px solid var(--border);
}

.CodeMirror-linenumber {
  color: var(--text-muted);
  padding: 0 8px;
}

.CodeMirror-cursor {
  border-left: 1px solid var(--text);
}

.CodeMirror-selected {
  background: var(--primary-light);
}

.CodeMirror-matchingbracket {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: bold;
}

/* Стили для кнопки переключения темы */
.theme-toggle {
  min-width: 40px;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  transform: scale(1.1);
}

/* ========================================
   АДАПТИВНОСТЬ
   ======================================== */

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .layout-adaptive {
    flex-direction: column;
    padding: 0 var(--spacing-md);
  }
  
  .sidebar {
    position: static;
  }
  
  .home-grid {
    grid-template-columns: 1fr;
  }
  
  .cards {
    grid-template-columns: 1fr;
  }
  
  .cards.tasks {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   СОВРЕМЕННЫЙ ДИЗАЙН ГЛАВНОЙ СТРАНИЦЫ
   ======================================== */

/* Full-bleed главная: убираем max-width контейнеров */
.home-page .home-main {
  max-width: none;
  width: 100%;
  margin: 0;
  padding: 0;
}

.home-page .layout-adaptive {
  display: block;
  max-width: none;
  margin: 0;
  padding: 0;
  min-height: 0;
}

.home-page .content-wrapper {
  display: block;
  justify-content: stretch;
}

.home-page .content-wrapper .content {
  max-width: none;
  width: 100%;
}

.home-page .content {
  padding: 0;
}

/* Hero Section */
.hero-modern {
  position: relative;
  min-height: calc(100vh - 72px);
  width: 100%;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #5b6ee1 0%, #6d3fa0 100%);
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.hero-shapes {
  position: absolute;
  width: 100%;
  height: 100%;
}

.shape {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  animation: float 6s ease-in-out infinite;
}

.shape-1 {
  width: 300px;
  height: 300px;
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.shape-2 {
  width: 200px;
  height: 200px;
  top: 60%;
  right: 15%;
  animation-delay: 2s;
}

.shape-3 {
  width: 150px;
  height: 150px;
  bottom: 20%;
  left: 60%;
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
  width: 100%;
}

/* Явные цвета на фиолетовом — и light, и dark тема */
.home-page .hero-modern .hero-text,
.home-page .hero-modern .hero-description,
.home-page .hero-modern .stat-label,
.home-page .hero-modern .hero-title,
.home-page .hero-modern .title-gradient {
  color: #ffffff !important;
  opacity: 1 !important;
  -webkit-text-fill-color: #ffffff !important;
  background: none !important;
  text-shadow: 0 1px 2px rgba(15, 23, 42, 0.2);
}

.home-page .hero-modern .stat-number {
  color: #fde68a !important;
  -webkit-text-fill-color: #fde68a !important;
  background: none !important;
  text-shadow: 0 1px 2px rgba(15, 23, 42, 0.35);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
}

.hero-description {
  font-size: 1.25rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-xl);
}

.hero-stats {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.stat {
  text-align: center;
  min-width: 4.5rem;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
}

.hero-modern .stat-label {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.btn-large {
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.btn-icon {
  width: 20px;
  height: 20px;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Демо-код всегда тёмный (не зависит от темы сайта) */
.home-page .hero-modern .code-block,
html.dark-theme .home-page .hero-modern .code-block,
body.dark-theme .home-page .hero-modern .code-block {
  background: #0f172a !important;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.35);
  width: 100%;
  max-width: 500px;
  padding: 0 !important;
  border: 1px solid rgba(148, 163, 184, 0.25) !important;
  margin: 0;
}

.home-page .hero-modern .code-header {
  background: #1e293b !important;
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.code-dots {
  display: flex;
  gap: var(--spacing-xs);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.home-page .hero-modern .code-title {
  color: #e2e8f0 !important;
  font-size: 0.9rem;
  font-family: var(--font-mono);
}

.home-page .hero-modern .code-content {
  padding: var(--spacing-lg);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  background: #0f172a !important;
}

.home-page .hero-modern .code-line {
  color: #e2e8f0 !important;
  margin-bottom: var(--spacing-xs);
}

.code-line.indent { padding-left: 2em; }
.code-line.indent-2 { padding-left: 4em; }
.code-line.indent-3 { padding-left: 6em; }

.home-page .hero-modern .code-keyword { color: #f472b6 !important; }
.home-page .hero-modern .code-function { color: #7dd3fc !important; }

/* Нижняя часть главной — читаемые цвета в обеих темах */
.home-page .features-section {
  background: var(--bg);
}

.home-page .feature-card,
.home-page .section-card {
  background: var(--bg-secondary);
  color: var(--text);
  border: 1px solid var(--border);
}

.home-page .feature-card h3,
.home-page .section-header h2,
.home-page .category-card h3,
.home-page .task-info h3,
.home-page .leader-name {
  color: var(--text) !important;
}

.home-page .feature-card p,
.home-page .category-card p,
.home-page .leader-points,
.home-page .task-points,
.home-page .daily-challenge-hint {
  color: var(--text-muted);
}

.home-page .category-card,
.home-page .task-card,
.home-page .leader-item {
  background: var(--bg);
  color: var(--text);
  border-color: var(--border);
}

.home-page .section-link,
.home-page .section-link:visited {
  color: var(--text-muted);
}

.home-page .cta-section,
.home-page .cta-section h2,
.home-page .cta-section p {
  color: #ffffff !important;
}

.home-page .cta-section {
  background: linear-gradient(135deg, #2563eb 0%, #0d9488 100%);
}

.home-page .cta-section p {
  opacity: 0.95;
}

/* Daily Challenge */
.daily-challenge {
  max-width: 1200px;
  margin: -2rem auto var(--spacing-2xl);
  padding: 0 var(--spacing-lg);
  position: relative;
  z-index: 3;
}

.daily-challenge-inner {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 55%, #0ea5e9 140%);
  color: #f8fafc;
  border-radius: 18px;
  padding: 1.25rem 1.5rem;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.08);
  animation: daily-rise 0.55s ease-out both;
}

.daily-challenge-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #7dd3fc !important;
  margin-bottom: 0.65rem;
}

.daily-challenge-badge::before {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: #22d3ee;
  box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.7);
  animation: daily-pulse 1.8s ease-out infinite;
}

.daily-challenge-body {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.daily-challenge-title {
  margin: 0 0 0.55rem;
  font-size: clamp(1.2rem, 2.2vw, 1.55rem);
  font-weight: 700;
  font-family: var(--font-problem, var(--font-family));
  line-height: 1.25;
  color: #ffffff !important;
}

.daily-challenge-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin: 0;
  font-size: 0.92rem;
  color: #e2e8f0 !important;
}

.daily-challenge-topic {
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #f8fafc !important;
}

.daily-challenge-hint {
  color: #cbd5e1 !important;
  font-size: 0.85rem;
}

.daily-challenge-cta {
  white-space: nowrap;
  flex-shrink: 0;
}

.dark-theme .daily-challenge-inner {
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

@keyframes daily-rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes daily-pulse {
  0% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.65); }
  70% { box-shadow: 0 0 0 8px rgba(34, 211, 238, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0); }
}

@media (max-width: 720px) {
  .daily-challenge {
    margin-top: -1rem;
  }

  .daily-challenge-cta {
    width: 100%;
    justify-content: center;
  }
}

.features-section {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-secondary);
}

.hero-modern .hero-description {
  color: rgba(255, 255, 255, 0.95);
}

.features-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  text-align: center;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  color: var(--text);
  border: 1px solid var(--border);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.feature-icon svg {
  width: 30px;
  height: 30px;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text);
}

.feature-card p {
  color: var(--text-muted);
  line-height: 1.6;
}

/* Modern Home Grid */
.home-grid-modern {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.section-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
  color: var(--text);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

.section-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
}

/* Categories Grid */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-lg);
}

.category-card,
.category-card:link,
.category-card:visited {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  transition: all 0.3s ease;
}

.category-card:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.category-icon {
  width: 50px;
  height: 50px;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.category-icon svg {
  width: 24px;
  height: 24px;
}

.category-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  text-align: center;
}

.category-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
}

/* Tasks List */
.tasks-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.task-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  transition: all 0.3s ease;
}

.task-card:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  transform: translateX(5px);
}

.task-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.task-meta {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.task-level {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
}

.task-level.easy { background: var(--accent-light); color: var(--accent); }
.task-level.medium { background: var(--warning-light); color: var(--warning); }
.task-level.hard { background: var(--danger-light); color: var(--danger); }

.task-points {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

.task-arrow {
  color: var(--text-muted);
  transition: color 0.3s ease;
}

.task-card:hover .task-arrow {
  color: var(--primary);
}

.task-arrow svg {
  width: 20px;
  height: 20px;
}

/* Leaderboard */
.leaderboard {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.leader-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.leader-item:hover {
  background: var(--primary-light);
  border-color: var(--primary);
}

.leader-rank {
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.leader-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
}

.leader-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

.leader-avatar-placeholder {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.leader-details {
  display: flex;
  flex-direction: column;
}

.leader-name {
  font-weight: 600;
  color: var(--text);
}

.leader-points {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.leader-medal {
  font-size: 1.5rem;
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.cta-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.cta-content h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
}

.cta-content p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.9;
}

.cta-actions {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    text-align: center;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .home-grid-modern {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .nav-inner {
    flex-wrap: wrap;
    gap: var(--spacing-md);
  }
  
  .search {
    min-width: 200px;
    order: 3;
    flex: 1;
  }
  
  .hero {
    padding: var(--spacing-xl);
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .profile-header {
    flex-direction: column;
    text-align: center;
  }
  
  .search-form {
    flex-direction: column;
  }
  
  .actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .tabs {
    flex-wrap: wrap;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-lg);
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .categories-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
  
  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ========================================
   ДОПОЛНИТЕЛЬНЫЕ СТИЛИ
   ======================================== */

/* Стили для сложности задач */
.badge.Easy {
  background: var(--easy-bg);
  color: var(--easy);
  border: 1px solid var(--easy);
}

.badge.Medium {
  background: var(--medium-bg);
  color: var(--medium);
  border: 1px solid var(--medium);
}

.badge.Hard {
  background: var(--hard-bg);
  color: var(--hard);
  border: 1px solid var(--hard);
}

.task-level.Easy {
  color: var(--easy);
}

.task-level.Medium {
  color: var(--medium);
}

.task-level.Hard {
  color: var(--hard);
}

/* Стили для тегов */
.task-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-top: 0.5rem;
}

.chip {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.2s ease;
}

.chip:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.chip.small {
  font-size: 0.7rem;
  padding: 0.2rem 0.4rem;
}

/* Стили для поиска */
.search-form {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.search-form input,
.search-form select {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 0.9rem;
}

.search-form input:focus,
.search-form select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

/* Улучшенные стили для карточек задач */
.task-card {
  position: relative;
  transition: all 0.2s ease;
}

.task-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

.task-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.task-card-title {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.task-card-status {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
}

/* Стили для статистики принятия */
.task-points {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ========================================
   СТРАНИЦА ЗАДАЧ
   ======================================== */

/* Заголовок страницы задач */
.problems-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.problems-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.problems-nav .nav-link,
.problems-nav .nav-link:visited {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
}

.problems-nav .nav-link:hover,
.problems-nav .nav-link:focus-visible {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.nav-separator {
  color: var(--text-muted);
  opacity: 0.7;
}

.nav-current {
  color: var(--text);
  font-weight: 600;
}

.problems-title {
  font-size: 2rem;
  font-weight: 600;
  margin: 0 0 0.5rem 0;
  color: var(--text);
}

.problems-stats {
  display: flex;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.stat-item {
  display: flex;
  align-items: center;
}

/* Ненавязчивая полоска «Продолжить» на /problems */
.problems-engage {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin: 0 0 1.25rem;
}

.continue-strip {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin: 0;
  padding: 0.65rem 0.85rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--primary) 6%, transparent);
}

.favorites-strip {
  background: color-mix(in srgb, #f59e0b 7%, transparent);
}

.continue-strip-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  flex-shrink: 0;
}

.continue-strip-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  min-width: 0;
  flex: 1;
}

.continue-chip,
.continue-chip:link,
.continue-chip:visited {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  max-width: 100%;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--border);
  background: var(--panel, #fff);
  font-size: 0.9rem;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.continue-chip:hover {
  border-color: color-mix(in srgb, var(--primary) 45%, var(--border));
}

.continue-chip.is-primary {
  border-color: color-mix(in srgb, var(--primary) 35%, var(--border));
  background: color-mix(in srgb, var(--primary) 10%, var(--panel, #fff));
}

.continue-chip.is-favorite {
  border-color: color-mix(in srgb, #f59e0b 40%, var(--border));
  background: color-mix(in srgb, #f59e0b 10%, var(--panel, #fff));
}

.continue-chip-star {
  color: #d97706;
  font-size: 0.85em;
  line-height: 1;
}

.continue-chip-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 220px;
}

.dark-theme .continue-strip {
  background: rgba(56, 189, 248, 0.06);
}

.dark-theme .favorites-strip {
  background: rgba(245, 158, 11, 0.08);
}

.dark-theme .continue-chip {
  background: rgba(255, 255, 255, 0.04);
}

@media (max-width: 640px) {
  .continue-strip {
    align-items: flex-start;
  }
  .continue-chip-title {
    max-width: 160px;
  }
}

/* Фильтры */
.problems-filters {
  margin-bottom: 1.5rem;
}

.filter-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.filter-tab {
  padding: 0.75rem 1rem;
  text-decoration: none;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
  font-weight: 500;
}

.filter-tab:hover {
  color: var(--text);
}

.filter-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* Список задач */
.problems-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.problem-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.2s ease;
}

.problem-item:hover {
  border-color: var(--primary);
  box-shadow: 0 2px 8px var(--shadow);
}

.problem-item.solved-problem {
  background: linear-gradient(90deg, rgba(34, 197, 94, 0.12) 0%, var(--bg-secondary) 12%);
  border-left: 4px solid #22c55e;
}

.problem-item.solved-problem:hover {
  border-left-color: #16a34a;
  box-shadow: 0 2px 8px rgba(34, 197, 94, 0.18);
}

html.dark-theme .problem-item.solved-problem,
.dark-theme .problem-item.solved-problem {
  background: linear-gradient(90deg, rgba(34, 197, 94, 0.14) 0%, var(--bg-secondary) 18%);
  border-left-color: #34d399;
}

html.dark-theme .problem-item.solved-problem:hover,
.dark-theme .problem-item.solved-problem:hover {
  border-left-color: #6ee7b7;
  box-shadow: 0 2px 10px rgba(52, 211, 153, 0.12);
  background: linear-gradient(90deg, rgba(34, 197, 94, 0.2) 0%, var(--bg-secondary) 20%);
}

.problem-content {
  flex: 1;
}

.problem-title {
  margin-bottom: 0.5rem;
}

.title-link,
.title-link:link,
.title-link:visited {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s ease;
}

.title-link:hover,
.title-link:focus-visible {
  color: var(--primary);
}

.problem-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.difficulty {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.difficulty.Easy {
  background: var(--easy-bg);
  color: var(--easy);
}

.difficulty.Medium {
  background: var(--medium-bg);
  color: var(--medium);
}

.difficulty.Hard {
  background: var(--hard-bg);
  color: var(--hard);
}

.status {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.status.solved {
  color: #155724;
  background: #d4edda;
  border: 1px solid #c3e6cb;
}

.status.attempted {
  color: #856404;
  background: #fff3cd;
  border: 1px solid #ffeaa7;
}

.solved-icon {
  display: inline-block;
  animation: checkmarkBounce 0.6s ease-out;
}

@keyframes checkmarkBounce {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  50% {
    transform: scale(1.3);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.problem-actions {
  margin-left: 1rem;
}

.btn-solve {
  display: inline-block;
  padding: 0.5rem 0.95rem;
  background: var(--primary);
  color: white;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.2s ease;
  border: none;
  border-radius: 10px;
  white-space: nowrap;
}

.btn-solve:hover {
  background: var(--primary-hover);
}

.interview-hub {
  max-width: 920px;
  margin: 0 auto;
  padding: 0.5rem 0 2rem;
}

.interview-hub-header {
  margin-bottom: 1.5rem;
  padding: 1.15rem 1.25rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel, #fff);
}

.interview-hub-kicker {
  margin: 0 0 0.35rem;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.interview-hub-header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.65rem;
}

.interview-hub-lead {
  margin: 0 0 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  max-width: 40rem;
}

.interview-rules {
  margin: 0 0 0.9rem;
  padding-left: 1.15rem;
  color: var(--text);
  line-height: 1.55;
}

.interview-hub-secondary {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.interview-hub-secondary .muted {
  opacity: 0.55;
}

.interview-hub-filters {
  margin-top: 1rem;
}

.interview-hub-filters .filter-tabs {
  margin: 0;
}

.interview-problem-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.interview-problem-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel, #fff);
}

.interview-problem-main {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  min-width: 0;
  flex: 1;
}

.interview-status {
  width: 1.4rem;
  text-align: center;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
  line-height: 1.4;
}

.interview-problem-item.is-solved .interview-status {
  color: #16a34a;
}

.interview-problem-item.is-attempted .interview-status {
  color: #dc2626;
}

.interview-problem-copy {
  min-width: 0;
}

.interview-problem-title,
.interview-problem-title:link,
.interview-problem-title:visited {
  display: block;
  font-weight: 600;
  text-decoration: none;
  color: var(--text);
  margin-bottom: 0.3rem;
}

.interview-problem-title:hover,
.interview-problem-title:focus-visible {
  color: var(--primary);
}

.interview-problem-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.7rem;
  align-items: center;
  font-size: 0.88rem;
}

.dark-theme .interview-hub-header,
.dark-theme .interview-problem-item {
  background: rgba(255, 255, 255, 0.03);
}

@media (max-width: 640px) {
  .interview-problem-item {
    flex-direction: column;
    align-items: stretch;
  }
}

.filter-special {
  margin-top: 0.75rem;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.88rem;
  background: transparent;
}

.filter-chip:hover,
.filter-chip.is-active {
  color: #b45309;
  border-color: rgba(245, 158, 11, 0.45);
  background: rgba(245, 158, 11, 0.1);
}

.tag-interview,
.chip.tag-interview {
  color: #b45309 !important;
  background: rgba(245, 158, 11, 0.14) !important;
  border-color: rgba(245, 158, 11, 0.35);
}

.interview-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #92400e;
  background: rgba(245, 158, 11, 0.18);
}

.dark-theme .interview-badge {
  color: #fbbf24;
  background: rgba(245, 158, 11, 0.16);
}

.interview-timer {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  min-width: 4.5rem;
  text-align: center;
  padding: 0.2rem 0.55rem;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.04);
}

.dark-theme .interview-timer {
  background: rgba(255, 255, 255, 0.06);
}

.interview-timer.is-warning {
  color: #d97706;
}

.interview-timer.is-expired {
  color: #dc2626;
}

.interview-report {
  margin-top: 0.55rem;
  font-size: 0.92rem;
  opacity: 0.95;
}

.weak-topics-panel {
  margin-bottom: 1.25rem;
}

.weak-topics-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.weak-topics-list li + li {
  margin-top: 0.45rem;
}

.weak-topics-list a,
.weak-topics-list a:link,
.weak-topics-list a:visited {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  padding: 0.55rem 0.35rem;
  text-decoration: none;
  color: inherit;
  border-radius: 8px;
}

.weak-topics-list a:hover {
  background: rgba(0, 0, 0, 0.04);
}

.dark-theme .weak-topics-list a:hover {
  background: rgba(255, 255, 255, 0.06);
}

.weak-topic-name {
  font-weight: 600;
}

/* Фильтр тем */
.topics-filter {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.topics-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.topic-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.topic-btn:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.topic-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.topic-count {
  background: var(--bg);
  color: var(--text-muted);
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
}

.topic-btn.active .topic-count {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

.show-all-btn {
  background: var(--secondary) !important;
  border-color: var(--secondary) !important;
  color: white !important;
  cursor: pointer;
}

.show-all-btn:hover {
  background: var(--text-muted) !important;
  border-color: var(--text-muted) !important;
}

.show-all-btn .topic-count {
  background: rgba(255, 255, 255, 0.2) !important;
  color: white !important;
}

.additional-topics {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

/* Теги задач */
.problem-tags {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.tag {
  background: var(--bg);
  color: var(--text-muted);
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 500;
  border: 1px solid var(--border);
}

/* ========================================
   МАКЕТ СТРАНИЦЫ ЗАДАЧИ
   ======================================== */

.problem-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin: 0 !important;
  padding: 0 !important;
  width: 100% !important;
  max-width: none !important;
}

.problem-layout .back {
  grid-column: 1 / -1;
  margin-bottom: 1rem;
  width: 100%;
  text-align: left;
  display: block;
  padding: 0.5rem 0;
}

.problem-description {
  min-width: 0;
  text-align: left;
  padding-left: 0;
}

.problem-sandbox {
  min-width: 0;
}

.problem-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.problem-header h1 {
  margin: 0;
  flex: 1;
  font-size: 1.5rem;
  font-weight: 600;
  text-align: left;
}

.problem-content h3 {
  margin: 0 0 1rem 0;
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: left;
}

.problem-content h4 {
  margin: 1.5rem 0 0.5rem 0;
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
}

.description-text {
  line-height: 1.75;
  font-family: var(--font-problem);
  color: var(--text);
  margin-bottom: 1.5rem;
  font-size: 15px;
  letter-spacing: 0.01em;
  text-align: left;
  word-wrap: break-word;
  overflow-wrap: break-word;
  background: var(--bg);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.description-text .code-snippet,
.description-text code {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

/* Стили для красивого форматирования задач */
.description-paragraph {
  margin: 1rem 0;
  line-height: 1.6;
}

.example-section {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.example-title {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 1rem 0;
}

.input-output {
  margin: 0.5rem 0;
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 0.5rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.code-snippet {
  display: inline-block;
  background: var(--bg-secondary);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
  margin: 0.25rem 0;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.explanation {
  margin: 0.5rem 0;
  font-style: italic;
  color: var(--text-muted);
}

.constraints-section {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.constraints-title {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 1rem 0;
}

.constraint-item {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
  margin: 0.5rem 0;
  padding: 0.5rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.followup-section {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.followup-title {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 1rem 0;
}

.followup-text {
  margin: 0.5rem 0;
  line-height: 1.6;
}

.description-text p {
  margin-bottom: 1rem;
}

.description-text strong {
  font-weight: 600;
}

.description-text em {
  font-style: italic;
}

.code-block {
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  margin: 0.5rem 0;
  border: 1px solid var(--border);
  text-align: left;
}

/* Не применяем «светлый» .code-block из описания задач к demo-блоку в hero */
.problem-content .code-block,
.description-text .code-block {
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  margin: 0.5rem 0;
  border: 1px solid var(--border);
}

.code-block pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
  white-space: pre-wrap;
  line-height: 1.5;
  text-align: left;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.examples-block {
  margin: 0.5rem 0;
  text-align: left;
}

.example-item {
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  text-align: left;
}

.example-item strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text);
  font-weight: 600;
  text-align: left;
}

.example-text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
  white-space: pre-wrap;
  line-height: 1.5;
  background: var(--bg);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  text-align: left;
}

.examples-text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
  white-space: pre-wrap;
  line-height: 1.6;
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  text-align: left;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.tags-section {
  margin: 1.5rem 0 0.5rem 0;
  text-align: left;
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.results-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.results-section h3 {
  margin: 0 0 1rem 0;
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: left;
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.result-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: 0.9rem;
}

.result-test {
  font-weight: 600;
  min-width: 80px;
  color: var(--text);
}

/* ========================================
   РЕДАКТОР КОДА И ПЕРЕКЛЮЧАТЕЛЬ ЯЗЫКОВ
   ======================================== */

/* Стили для CodeMirror */
.CodeMirror {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  background: var(--bg-secondary);
  color: var(--text);
  height: auto;
  min-height: 400px;
}

.CodeMirror-focused {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.CodeMirror-gutters {
  background: var(--bg);
  border-right: 1px solid var(--border);
}

.CodeMirror-linenumber {
  color: var(--text-muted);
  padding: 0 8px;
}

.CodeMirror-cursor {
  border-left: 1px solid var(--text);
}

.CodeMirror-selected {
  background: var(--primary-light);
}

.CodeMirror-matchingbracket {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: bold;
}

/* Python синтаксис - темная тема */
.cm-keyword { color: #ff79c6; font-weight: bold; }
.cm-builtin { color: #50fa7b; }
.cm-string { color: #f1fa8c; }
.cm-comment { color: #6272a4; font-style: italic; }
.cm-number { color: #bd93f9; }
.cm-def { color: #8be9fd; font-weight: bold; }
.cm-variable { color: #f8f8f2; }
.cm-variable-2 { color: #8be9fd; }
.cm-operator { color: #ff79c6; }
.cm-bracket { color: #f8f8f2; }

/* JavaScript синтаксис - темная тема */
.cm-js-keyword { color: #ff79c6; font-weight: bold; }
.cm-js-string { color: #f1fa8c; }
.cm-js-comment { color: #6272a4; font-style: italic; }
.cm-js-number { color: #bd93f9; }
.cm-js-variable { color: #f8f8f2; }
.cm-js-property { color: #8be9fd; }

/* Java/C/C++ синтаксис - темная тема */
.cm-java-keyword { color: #ff79c6; font-weight: bold; }
.cm-java-string { color: #f1fa8c; }
.cm-java-comment { color: #6272a4; font-style: italic; }
.cm-java-number { color: #bd93f9; }
.cm-java-variable { color: #f8f8f2; }
.cm-java-type { color: #8be9fd; font-weight: bold; }

/* Светлые темы - адаптация цветов */
.CodeMirror:not(.cm-s-monokai) .cm-keyword,
.CodeMirror.cm-s-default .cm-keyword,
.CodeMirror.cm-s-solarized-light .cm-keyword,
.CodeMirror.cm-s-github .cm-keyword { 
  color: #0000ff !important; 
  font-weight: bold; 
}

.CodeMirror:not(.cm-s-monokai) .cm-builtin { 
  color: #0066cc !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-string { 
  color: #008000 !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-comment { 
  color: #808080 !important; 
  font-style: italic; 
}

.CodeMirror:not(.cm-s-monokai) .cm-number { 
  color: #800080 !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-def { 
  color: #0066cc !important; 
  font-weight: bold; 
}

.CodeMirror:not(.cm-s-monokai) .cm-variable { 
  color: #000000 !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-variable-2 { 
  color: #0066cc !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-operator { 
  color: #ff0000 !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-bracket { 
  color: #000000 !important; 
}

/* Универсальные правила для всех светлых тем */
.CodeMirror.cm-s-default .cm-keyword,
.CodeMirror.cm-s-solarized-light .cm-keyword,
.CodeMirror.cm-s-github .cm-keyword { 
  color: #0000ff !important; 
  font-weight: bold; 
}

.CodeMirror.cm-s-default .cm-string,
.CodeMirror.cm-s-solarized-light .cm-string,
.CodeMirror.cm-s-github .cm-string { 
  color: #008000 !important; 
}

.CodeMirror.cm-s-default .cm-comment,
.CodeMirror.cm-s-solarized-light .cm-comment,
.CodeMirror.cm-s-github .cm-comment { 
  color: #808080 !important; 
  font-style: italic; 
}

.CodeMirror.cm-s-default .cm-number,
.CodeMirror.cm-s-solarized-light .cm-number,
.CodeMirror.cm-s-github .cm-number { 
  color: #800080 !important; 
}

.CodeMirror.cm-s-default .cm-variable,
.CodeMirror.cm-s-solarized-light .cm-variable,
.CodeMirror.cm-s-github .cm-variable { 
  color: #000000 !important; 
}

.CodeMirror.cm-s-default .cm-def,
.CodeMirror.cm-s-solarized-light .cm-def,
.CodeMirror.cm-s-github .cm-def { 
  color: #0066cc !important; 
  font-weight: bold; 
}

.CodeMirror.cm-s-default .cm-builtin,
.CodeMirror.cm-s-solarized-light .cm-builtin,
.CodeMirror.cm-s-github .cm-builtin { 
  color: #0066cc !important; 
}

.CodeMirror.cm-s-default .cm-operator,
.CodeMirror.cm-s-solarized-light .cm-operator,
.CodeMirror.cm-s-github .cm-operator { 
  color: #ff0000 !important; 
}

/* JavaScript для светлых тем */
.CodeMirror:not(.cm-s-monokai) .cm-js-keyword { 
  color: #0000ff !important; 
  font-weight: bold; 
}

.CodeMirror:not(.cm-s-monokai) .cm-js-string { 
  color: #008000 !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-js-comment { 
  color: #808080 !important; 
  font-style: italic; 
}

.CodeMirror:not(.cm-s-monokai) .cm-js-number { 
  color: #800080 !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-js-variable { 
  color: #000000 !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-js-property { 
  color: #0066cc !important; 
}

/* Java/C/C++ для светлых тем */
.CodeMirror:not(.cm-s-monokai) .cm-java-keyword { 
  color: #0000ff !important; 
  font-weight: bold; 
}

.CodeMirror:not(.cm-s-monokai) .cm-java-string { 
  color: #008000 !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-java-comment { 
  color: #808080 !important; 
  font-style: italic; 
}

.CodeMirror:not(.cm-s-monokai) .cm-java-number { 
  color: #800080 !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-java-variable { 
  color: #000000 !important; 
}

.CodeMirror:not(.cm-s-monokai) .cm-java-type { 
  color: #0066cc !important; 
  font-weight: bold; 
}

.code-editor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.editor-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.language-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.language-selector label {
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  margin: 0;
}

.language-selector select {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 0.9rem;
  min-width: 120px;
}

.language-selector select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.language-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.language-selector label {
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
}

.language-selector select {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 0.9rem;
  min-width: 150px;
}

.language-selector select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.code-editor {
  margin-bottom: 1rem;
}

.code-editor label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text);
}

.code-editor textarea {
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  resize: vertical;
  min-height: 400px;
}

.code-editor textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.code-editor textarea::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

/* Адаптивные стили для мобильных устройств */
@media (max-width: 768px) {
  .search-form {
    flex-direction: column;
    align-items: stretch;
  }
  
  .search-form input,
  .search-form select {
    width: 100%;
  }
  
  .task-tags {
    justify-content: flex-start;
  }
  
  .chip {
    font-size: 0.7rem;
  }
  
  .topics-buttons {
    justify-content: center;
  }
  
  .problem-item {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }
  
  .problem-actions {
    margin-left: 0;
    text-align: center;
  }
  
  .filter-tabs {
    flex-wrap: wrap;
  }
  
  .preview-stats {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .code-editor-header {
    flex-direction: column;
    align-items: stretch;
  }
  
  .language-selector {
    justify-content: space-between;
  }
  
  .language-selector select {
    min-width: auto;
    flex: 1;
  }
  
  .code-editor textarea {
    min-height: 300px;
  }
  
  .problem-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 0 0.5rem;
  }
  
  .problem-header h1 {
    font-size: 1.3rem;
  }
  
  .result-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .result-test {
    min-width: auto;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .task-card {
    padding: var(--spacing-md);
  }
  
  .table th,
  .table td {
    padding: var(--spacing-md);
  }
  
  .profile-stats {
    grid-template-columns: 1fr;
  }
}

/* Стили для страницы песочницы */
.sandbox-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.sandbox-page .panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.sandbox-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.sandbox-header h1 {
  margin: 0;
  color: var(--text);
  font-size: 2rem;
  font-weight: 600;
}

.sandbox-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.language-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.language-selector label {
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  margin: 0;
}

.language-selector select {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 0.9rem;
  min-width: 120px;
}

.language-selector select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.code-editor-container {
  margin-bottom: 1.5rem;
}

.code-editor-container textarea {
  width: 100%;
  min-height: 400px;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  resize: vertical;
}

.code-editor-container textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.form-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.form-actions .btn {
  min-width: 120px;
}

.results {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.results h3 {
  margin: 0 0 1rem 0;
  color: var(--text);
  font-size: 1.25rem;
  font-weight: 600;
}

.result-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 1rem;
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.result-status {
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.result-status.success {
  background: var(--success-light);
  color: var(--success);
}

.result-status.error {
  background: var(--error-light);
  color: var(--error);
}

.result-time {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.result-output {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-x: auto;
}

.result-output pre {
  margin: 0;
  color: var(--text);
}

.error-message {
  color: var(--error);
  margin-top: 1rem;
  padding: 0.5rem;
  background: var(--error-light);
  border-radius: var(--radius-sm);
  border: 1px solid var(--error);
}

/* CodeMirror стили для песочницы */
.CodeMirror {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  background: var(--bg-secondary);
  color: var(--text);
  height: 400px;
  direction: ltr;
}

.CodeMirror-focused {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.CodeMirror-gutters {
  background: var(--bg);
  border-right: 1px solid var(--border);
}

.CodeMirror-linenumber {
  color: var(--text-muted);
  padding: 0 8px;
}

.CodeMirror-cursor {
  border-left: 1px solid var(--text);
}

.CodeMirror-selected {
  background: var(--primary-light);
}

.CodeMirror-matchingbracket {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: bold;
}

/* Темная тема для CodeMirror — чистый чёрный фон редактора */
.dark-theme .CodeMirror,
html.dark-theme .CodeMirror,
.dark-theme .CodeMirror.cm-s-monokai,
html.dark-theme .CodeMirror.cm-s-monokai {
  background: #000000 !important;
  color: #e0e0e0;
  border-color: #333333;
}

.dark-theme .CodeMirror .CodeMirror-scroll,
html.dark-theme .CodeMirror .CodeMirror-scroll,
.dark-theme .cm-s-monokai .CodeMirror-scroll,
html.dark-theme .cm-s-monokai .CodeMirror-scroll {
  background: #000000 !important;
}

.dark-theme .CodeMirror-gutters,
html.dark-theme .CodeMirror-gutters,
.dark-theme .cm-s-monokai .CodeMirror-gutters,
html.dark-theme .cm-s-monokai .CodeMirror-gutters {
  background: #000000 !important;
  border-right: 1px solid #222222 !important;
}

.dark-theme .CodeMirror-linenumber,
html.dark-theme .CodeMirror-linenumber {
  color: #a0a0a0 !important;
  padding: 0 4px;
}

.dark-theme .CodeMirror-cursor,
html.dark-theme .CodeMirror-cursor {
  border-left: 1px solid #e0e0e0;
}

.dark-theme .CodeMirror-selected,
html.dark-theme .CodeMirror-selected {
  background: rgba(255, 255, 255, 0.1);
}

.dark-theme .CodeMirror-matchingbracket,
html.dark-theme .CodeMirror-matchingbracket {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  font-weight: bold;
}

/* Полосы прокрутки для темной темы */
.dark-theme .CodeMirror-scroll,
html.dark-theme .CodeMirror-scroll {
  scrollbar-width: thin;
  scrollbar-color: #404040 #000000;
}

.dark-theme .CodeMirror-scroll::-webkit-scrollbar,
html.dark-theme .CodeMirror-scroll::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.dark-theme .CodeMirror-scroll::-webkit-scrollbar-track,
html.dark-theme .CodeMirror-scroll::-webkit-scrollbar-track {
  background: #000000;
}

.dark-theme .CodeMirror-scroll::-webkit-scrollbar-thumb,
html.dark-theme .CodeMirror-scroll::-webkit-scrollbar-thumb {
  background: #404040;
  border-radius: 4px;
}

.dark-theme .CodeMirror-scroll::-webkit-scrollbar-thumb:hover,
html.dark-theme .CodeMirror-scroll::-webkit-scrollbar-thumb:hover {
  background: #606060;
}

.dark-theme .code-editor-container,
html.dark-theme .code-editor-container {
  background: #000000;
}

/* Светлая тема - более контрастная полоса разделения */

/* Дополнительные стили для светлой темы */
body:not(.dark-theme) .CodeMirror-gutters,
html:not(.dark-theme) .CodeMirror-gutters {
  background: #f8f9fa !important;
  border-right: 2px solid #dee2e6 !important;
}

body:not(.dark-theme) .CodeMirror-linenumber,
html:not(.dark-theme) .CodeMirror-linenumber {
  color: #6c757d !important;
  padding: 0 4px;
}

/* Принудительные стили для светлой темы CodeMirror */
body:not(.dark-theme) .CodeMirror .CodeMirror-gutters {
  background: #f8f9fa !important;
  border-right: 2px solid #dee2e6 !important;
}

body:not(.dark-theme) .CodeMirror .CodeMirror-linenumber {
  color: #6c757d !important;
  padding: 0 4px !important;
}

/* Принудительные стили для темной темы CodeMirror */
body.dark-theme .CodeMirror .CodeMirror-gutters,
html.dark-theme .CodeMirror .CodeMirror-gutters,
body.dark-theme .cm-s-monokai .CodeMirror-gutters,
html.dark-theme .cm-s-monokai .CodeMirror-gutters {
  background: #000000 !important;
  border-right: 1px solid #222222 !important;
}

body.dark-theme .CodeMirror .CodeMirror-linenumber,
html.dark-theme .CodeMirror .CodeMirror-linenumber {
  color: #a0a0a0 !important;
  padding: 0 4px !important;
}

body.dark-theme .CodeMirror.cm-s-monokai,
html.dark-theme .CodeMirror.cm-s-monokai {
  background: #000000 !important;
}
/* Улучшенные стили для песочницы */
.editor-section {
  position: relative;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.editor-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  color: var(--text);
}

.editor-icon {
  font-size: 1.2rem;
}

.editor-label {
  font-size: 1rem;
}

.code-editor-container {
  padding: 1rem;
  background: var(--bg);
}

.code-editor-container textarea {
  width: 100%;
  min-height: 400px;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  resize: vertical;
}

.code-editor-container textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

/* Стили для результатов выполнения */
.execution-results {
  margin-top: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.results-header h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-size: 1.1rem;
  color: var(--text);
}

.results-icon {
  font-size: 1.2rem;
}

.execution-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.execution-time {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.time-icon {
  font-size: 0.9rem;
}

.execution-status {
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
}

.execution-status.success {
  background: var(--success-light);
  color: var(--success);
}

.execution-status.error {
  background: var(--error-light);
  color: var(--error);
}

/* Секции вывода и ошибок */
.output-section,
.error-section {
  border-bottom: 1px solid var(--border);
}

.output-section:last-child,
.error-section:last-child {
  border-bottom: none;
}

.output-header,
.error-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  color: var(--text);
}

.output-icon,
.error-icon {
  font-size: 1rem;
}

.output-label,
.error-label {
  font-size: 0.9rem;
}

.output-content,
.error-content {
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
}

.output-text,
.error-text {
  margin: 0;
  padding: 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-x: auto;
  color: var(--text);
}

.error-text {
  color: var(--error);
  border-color: var(--error);
  background: var(--error-light);
}


/* Улучшенные кнопки для песочницы */
.action-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.action-buttons .btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 140px;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.btn-icon {
  font-size: 1rem;
}

.action-buttons .btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.action-buttons .btn {
  opacity: 1 !important;
}

.action-buttons .btn.primary {
  background: var(--primary);
  color: white;
  border: none;
  opacity: 1 !important;
}

.action-buttons .btn.primary:hover {
  background: var(--primary) !important;
  border: 2px solid var(--primary) !important;
  box-shadow: 0 0 0 2px var(--focus-ring) !important;
  transform: none !important;
  opacity: 1 !important;
}

.action-buttons .btn.secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}

.action-buttons .btn.secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--border-hover);
}

/* Стили для пагинации и загрузки */
.loading-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top: 2px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.load-more-container {
  display: flex;
  justify-content: center;
  padding: 2rem;
}

.load-more-container .btn {
  min-width: 150px;
}

@media (max-width: 768px) {
  .loading-indicator {
    padding: 1rem;
    font-size: 0.8rem;
  }
  .load-more-container {
    padding: 1rem;
  }
  .load-more-container .btn {
    width: 100%;
    max-width: 200px;
  }
}

/* Кнопка 'Наверх' */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 20px;
  font-weight: bold;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.back-to-top:active {
  transform: translateY(0);
}

/* Адаптивность для кнопки 'Наверх' */
@media (max-width: 768px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    font-size: 18px;
  }
}
/* ========================================
   HIGH-PRIORITY UX: nav, judge, examples
   ======================================== */

.nav-burger {
  display: none;
  margin-left: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-left: auto;
  flex-wrap: wrap;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 0.35rem);
  min-width: 180px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.12);
  padding: 0.4rem;
  z-index: 200;
}

.nav-dropdown-menu.is-open {
  display: grid;
  gap: 0.15rem;
}

.nav-dropdown-menu a {
  display: block;
  padding: 0.55rem 0.75rem;
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.92rem;
}

.nav-dropdown-menu a:hover {
  background: var(--bg);
}

.nav-dropdown-menu .nav-logout {
  color: var(--danger);
}

@media (max-width: 900px) {
  .nav-burger {
    display: inline-flex;
  }

  .nav-menu {
    display: none;
    width: 100%;
    margin-left: 0;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
  }

  .nav-menu.is-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .nav-menu .search,
  .nav-menu .btn {
    width: 100%;
  }

  .nav-dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    padding: 0;
  }

  .nav-inner {
    flex-wrap: wrap;
  }
}

.examples-section,
.constraints-section,
.tags-section {
  margin-top: 1.5rem;
}

.examples-section h4,
.constraints-section h4 {
  margin-bottom: 0.75rem;
  font-size: 1rem;
  color: var(--text);
}

.example-item {
  margin-bottom: 0.75rem;
  padding: 0.75rem;
  background: var(--bg);
  border-left: 3px solid var(--primary);
  border-radius: 4px;
  border: 1px solid var(--border);
  border-left-width: 3px;
  border-left-color: var(--primary);
}

.example-row {
  margin-bottom: 0.4rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.example-label {
  min-width: 100px;
  font-size: 0.85em;
  color: var(--text-muted);
}

.example-code {
  flex: 1;
  padding: 0.35rem 0.6rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  display: inline-block;
  color: var(--text);
  word-break: break-word;
}

.example-explanation {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85em;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.4;
}

.constraints-text {
  white-space: pre-line;
  padding: 0.75rem;
  background: var(--bg);
  border-left: 3px solid var(--warning);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  line-height: 1.6;
  color: var(--text);
  border: 1px solid var(--border);
  border-left-width: 3px;
  border-left-color: var(--warning);
}

.login-required-box {
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
}

.login-required-box h3 {
  margin-bottom: 1rem;
  color: var(--text);
}

.login-required-box p {
  margin-bottom: 1.5rem;
}

.judge-panel {
  margin-top: 1rem;
}

.judge-loading {
  padding: 1rem;
  border-radius: 10px;
  background: var(--bg);
  border: 1px dashed var(--border);
  color: var(--text-muted);
  text-align: center;
}

.judge-success {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.1rem 1.25rem;
  border-radius: 10px;
  background: var(--accent-light);
  border: 1px solid #86efac;
  color: #166534;
}

.dark-theme .judge-success {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.35);
  color: #bbf7d0;
}

.judge-success-icon {
  font-size: 1.8rem;
  line-height: 1;
}

.judge-success-title {
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.judge-success-meta {
  font-size: 0.92rem;
  opacity: 0.9;
}

.judge-points {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  background: rgba(22, 163, 74, 0.15);
  font-weight: 600;
}

.judge-fail {
  padding: 1rem 1.1rem;
  border-radius: 10px;
  background: var(--danger-light);
  border: 1px solid #fca5a5;
  color: #991b1b;
}

.dark-theme .judge-fail {
  background: rgba(239, 68, 68, 0.14);
  border-color: rgba(239, 68, 68, 0.35);
  color: #fecaca;
}

.judge-fail-title {
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.judge-kv {
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

.judge-kv span {
  display: block;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.judge-kv code,
.judge-trace pre {
  display: block;
  padding: 0.5rem;
  border-radius: 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-mono);
  white-space: pre-wrap;
  word-break: break-word;
}

.judge-msg {
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

.judge-hint {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  opacity: 0.85;
}

.judge-actions .btn:disabled {
  opacity: 0.65;
  cursor: wait;
}

.performance-charts {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.performance-chart {
  padding: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.perf-chart-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  gap: 1rem;
}

.perf-chart-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.perf-chart-value {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
}

.perf-percentile {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}

.perf-chart-canvas {
  position: relative;
  height: 180px;
}

.status.solved {
  color: #166534;
  background: #dcfce7;
  border: 1px solid #86efac;
}

.status.attempted {
  color: #92400e;
  background: #fef3c7;
  border: 1px solid #fcd34d;
}

.dark-theme .status.solved {
  color: #bbf7d0;
  background: rgba(16, 185, 129, 0.18);
  border-color: rgba(16, 185, 129, 0.35);
}

.dark-theme .status.attempted {
  color: #fde68a;
  background: rgba(245, 158, 11, 0.18);
  border-color: rgba(245, 158, 11, 0.35);
}

.auth-panel {
  max-width: 420px;
  margin: 0 auto;
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-header h1 {
  margin-bottom: 0.5rem;
}

.auth-footer {
  text-align: center;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.field-hint {
  margin: -0.35rem 0 0.85rem;
  font-size: 0.82rem;
  line-height: 1.35;
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.profile-page-header {
  margin-bottom: 1.25rem;
}

.profile-page-header h1 {
  margin-bottom: 0.25rem;
}

.profile-password-panel {
  margin-top: 1.25rem;
}

.profile-password-lead {
  margin: -0.25rem 0 1rem;
  font-size: 0.92rem;
}

.form-error-inline {
  color: var(--danger);
  font-size: 0.9rem;
}

/* ===== Activity calendar (GitHub-like) ===== */
.activity-panel {
  margin-top: 1.25rem;
  margin-bottom: 0.25rem;
}

.activity-panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-bottom: 1rem;
}

.activity-panel-head h2 {
  margin: 0;
  font-size: 1.15rem;
}

.activity-panel-head .muted {
  margin: 0;
  font-size: 0.9rem;
}

.activity-graph-wrap {
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.activity-graph {
  --cell: 11px;
  --gap: 3px;
  min-width: max-content;
}

.activity-months {
  display: grid;
  grid-template-columns: repeat(var(--weeks), var(--cell));
  column-gap: var(--gap);
  margin: 0 0 0.35rem calc(1.6rem + var(--gap));
  height: 1rem;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.activity-month {
  grid-row: 1;
  white-space: nowrap;
  line-height: 1;
}

.activity-body {
  display: flex;
  align-items: flex-start;
  gap: var(--gap);
}

.activity-wdays {
  display: grid;
  grid-template-rows: repeat(7, var(--cell));
  row-gap: var(--gap);
  width: 1.6rem;
  font-size: 0.65rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.activity-wday {
  display: flex;
  align-items: center;
  height: var(--cell);
  line-height: 1;
}

.activity-wday.is-empty {
  visibility: hidden;
}

.activity-weeks {
  display: flex;
  gap: var(--gap);
}

.activity-week {
  display: grid;
  grid-template-rows: repeat(7, var(--cell));
  row-gap: var(--gap);
}

.activity-cell {
  width: var(--cell);
  height: var(--cell);
  border-radius: 2px;
  background: var(--activity-0);
  outline: 1px solid rgba(27, 31, 35, 0.06);
  box-sizing: border-box;
}

.activity-cell.is-future {
  opacity: 0;
  pointer-events: none;
  outline: none;
}

.activity-legend {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.25rem;
  margin-top: 0.75rem;
  margin-left: calc(1.6rem + var(--gap));
  font-size: 0.75rem;
}

.activity-legend .activity-cell {
  outline: 1px solid rgba(27, 31, 35, 0.06);
}

:root {
  --activity-0: #ebedf0;
  --activity-1: #9be9a8;
  --activity-2: #40c463;
  --activity-3: #30a14e;
  --activity-4: #216e39;
}

html.dark-theme,
.dark-theme {
  --activity-0: #21262d;
  --activity-1: #0e4429;
  --activity-2: #006d32;
  --activity-3: #26a641;
  --activity-4: #39d353;
}

.activity-level-0 { background: var(--activity-0); }
.activity-level-1 { background: var(--activity-1); }
.activity-level-2 { background: var(--activity-2); }
.activity-level-3 { background: var(--activity-3); }
.activity-level-4 { background: var(--activity-4); }
.activity-level--1 { background: transparent; outline: none; }

html.dark-theme .activity-cell,
.dark-theme .activity-cell {
  outline-color: rgba(240, 246, 252, 0.08);
}

@media (max-width: 640px) {
  .activity-graph {
    --cell: 10px;
    --gap: 2px;
  }
}

.nav-logout-form {
  margin: 0;
  padding: 0;
}

.nav-logout-form .nav-logout {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 0.55rem 0.75rem;
  border-radius: 6px;
  color: var(--danger);
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
}

.nav-logout-form .nav-logout:hover {
  background: var(--bg);
}

.problem-top-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  margin-bottom: 1rem;
}

.problem-top-nav .back {
  margin: 0;
}

.topic-progress {
  font-size: 0.9rem;
}

.problem-siblings {
  display: flex;
  gap: 0.5rem;
  margin-left: auto;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
}

.btn-sm.is-disabled,
span.btn.is-disabled {
  opacity: 0.45;
  pointer-events: none;
  cursor: default;
}

/* ========================================
   РЕДАКТОР РЕШЕНИЯ (страница задачи)
   ======================================== */

.code-editor-heading {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.code-editor-heading h2 {
  margin: 0;
}

.editor-lang-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-sm);
}

.editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.editor-hint {
  font-size: 0.78rem;
  margin-left: auto;
}

#code-editor-wrap {
  resize: vertical;
  overflow: hidden;
  min-height: 360px;
  max-height: 75vh;
  height: 520px;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
}

#code-editor-wrap .CodeMirror {
  min-height: 100%;
  height: 100% !important;
  border: none;
  border-radius: 0;
}

.code-editor-container .CodeMirror,
.code-editor-container .CodeMirror .CodeMirror-code {
  user-select: text !important;
  -webkit-user-select: text !important;
}

.CodeMirror-selected {
  background: rgba(99, 102, 241, 0.28) !important;
}

.dark-theme .CodeMirror-selected,
html.dark-theme .CodeMirror-selected {
  background: rgba(129, 140, 248, 0.35) !important;
}

.editor-toast {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 10000;
  padding: 0.65rem 1rem;
  background: var(--text);
  color: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
  pointer-events: none;
}

.judge-kv code,
.judge-trace pre,
.judge-msg {
  user-select: text;
  cursor: text;
}

@media (max-width: 768px) {
  .editor-hint {
    margin-left: 0;
    width: 100%;
  }

  #code-editor-wrap {
    height: 420px;
    min-height: 280px;
  }
}

.consent-row {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  font-weight: 400;
  line-height: 1.45;
  font-size: 0.92rem;
}

.consent-row input[type="checkbox"] {
  width: auto;
  margin-top: 0.2rem;
  flex-shrink: 0;
}

.consent-row a {
  color: var(--primary);
}

.legal-panel {
  max-width: 760px;
  margin: 0 auto;
}

.legal-panel h1 {
  font-size: 1.6rem;
  margin-bottom: 0.35rem;
}

.legal-panel h2 {
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.legal-panel ul {
  padding-left: 1.25rem;
  margin: 0.5rem 0 0;
}

.legal-panel li {
  margin-bottom: 0.35rem;
}

.legal-note {
  padding: 0.75rem 1rem;
  margin: 1rem 0 1.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-footer {
  margin-top: 2.5rem;
  padding: 1.25rem 0 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
}

.site-footer .container {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

/* Engagement: streak / favorites / tracks / share */
.daily-streak-note {
  margin: 0.65rem 0 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.daily-streak-note strong {
  color: var(--text);
}

.home-engage {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.5rem auto 0;
  max-width: 1100px;
  padding: 0 1.25rem;
}

.home-engage-panel {
  margin: 0;
}

.home-engage-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.home-engage-head h2 {
  margin: 0;
  font-size: 1.15rem;
}

.home-engage-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.home-engage-list li + li {
  margin-top: 0.4rem;
}

.home-engage-list a,
.home-engage-list a:link,
.home-engage-list a:visited {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
  padding: 0.45rem 0.35rem;
  border-radius: 8px;
}

.home-engage-list a:hover {
  background: rgba(0, 0, 0, 0.04);
}

.dark-theme .home-engage-list a:hover {
  background: rgba(255, 255, 255, 0.06);
}

.home-engage-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.profile-diff-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1.25rem;
}

.diff-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  font-size: 0.9rem;
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.diff-pill span {
  font-weight: 700;
}

.diff-pill.Easy { color: #15803d; background: rgba(34, 197, 94, 0.12); }
.diff-pill.Medium { color: #b45309; background: rgba(245, 158, 11, 0.14); }
.diff-pill.Hard { color: #b91c1c; background: rgba(239, 68, 68, 0.12); }

.dark-theme .diff-pill {
  border-color: rgba(255, 255, 255, 0.1);
}

.problem-header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.favorite-btn.is-active {
  color: #b45309;
  border-color: rgba(245, 158, 11, 0.45);
}

.judge-streak {
  margin-top: 0.4rem;
  font-size: 0.92rem;
  opacity: 0.95;
}

.page-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.page-header-row h1 {
  margin: 0 0 0.35rem;
}

.tracks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.track-card,
.track-card:link,
.track-card:visited {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease;
}

.track-card:hover {
  transform: translateY(-2px);
}

.track-card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
}

.track-progress-meta {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.85rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.track-progress-bar {
  margin-top: 0.55rem;
  height: 8px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.dark-theme .track-progress-bar {
  background: rgba(255, 255, 255, 0.12);
}

.track-progress-bar-wide {
  max-width: 420px;
}

.track-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #0ea5e9, #22c55e);
  border-radius: inherit;
}

.track-problem-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.track-problem-list.numbered {
  counter-reset: track-item;
}

.track-problem-item {
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 10px;
  margin-bottom: 0.55rem;
  background: var(--panel, #fff);
}

.dark-theme .track-problem-item {
  border-color: rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.03);
}

.track-problem-item a,
.track-problem-item a:link,
.track-problem-item a:visited {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.9rem;
  text-decoration: none;
  color: inherit;
}

.track-problem-title {
  flex: 1;
  min-width: 0;
}

.track-status {
  width: 1.5rem;
  text-align: center;
  font-weight: 700;
  color: var(--text-muted);
}

.track-problem-item.is-solved .track-status {
  color: #16a34a;
}

.track-problem-item.is-attempted .track-status {
  color: #dc2626;
}