/* ============================================================
   English Guide — Shared Stylesheet
   Все стили сайта в одном файле. Изменить цвет акцента,
   шрифт или отступы — достаточно поправить переменные в :root.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============================================================
   ПЕРЕМЕННЫЕ
   ============================================================ */
:root {
  /* Фон */
  --bg:           #ffffff;
  --bg-alt:       #f8f9fc;
  --bg-alt2:      #f0f2f7;
  --surface:      #ffffff;

  /* Границы */
  --border:       #e5e7eb;
  --border-light: #f0f1f4;

  /* Текст */
  --text:           #111827;
  --text-secondary: #6b7280;
  --text-tertiary:  #9ca3af;

  /* Акцент (грамматика + общий) */
  --accent:       #4f46e5;
  --accent-hover: #4338ca;
  --accent-light: #eef2ff;
  --accent-mid:   #c7d2fe;

  /* Категория: Фонетика */
  --phonetics:       #059669;
  --phonetics-light: #ecfdf5;
  --phonetics-mid:   #a7f3d0;

  /* Категория: Грамматика */
  --grammar:       #4f46e5;
  --grammar-light: #eef2ff;
  --grammar-mid:   #c7d2fe;

  /* Категория: Лексика */
  --vocabulary:       #d97706;
  --vocabulary-light: #fffbeb;
  --vocabulary-mid:   #fde68a;

  /* Категория: Речь и письмо */
  --writing:       #dc2626;
  --writing-light: #fef2f2;
  --writing-mid:   #fecaca;

  /* Типографика */
  --font:      'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Скругления */
  --r-sm: 6px;
  --r:    10px;
  --r-lg: 16px;
  --r-xl: 24px;

  /* Тени */
  --shadow-sm:    0 1px 2px rgba(0,0,0,0.05);
  --shadow:       0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:    0 4px 12px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 28px rgba(0,0,0,0.10), 0 2px 8px rgba(0,0,0,0.05);

  /* Макет */
  --max-w:         1200px;
  --max-w-content: 860px;

  /* Переходы */
  --tr: 0.2s ease;
}

/* ============================================================
   СБРОС И БАЗА
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: clip; }

body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color var(--tr); }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ============================================================
   СЕТКА / КОНТЕЙНЕР
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}
.container--content { max-width: var(--max-w-content); }

/* ============================================================
   ШАПКА (HEADER)
   ============================================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.header__inner {
  display: flex;
  align-items: center;
  height: 62px;
  gap: 1.5rem;
}

/* Логотип */
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.logo:hover { color: var(--text); }

.logo__mark {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #5b50ea 0%, #818cf8 100%);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* Навигация */
.nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--r-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--tr);
  white-space: nowrap;
}
.nav__link:hover { color: var(--text); background: var(--bg-alt2); }
.nav__link.active { color: var(--text); background: var(--bg-alt2); }

.nav__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}
.nav__link--phonetics   .nav__dot { background: var(--phonetics); }
.nav__link--grammar     .nav__dot { background: var(--grammar); }
.nav__link--vocabulary  .nav__dot { background: var(--vocabulary); }
.nav__link--writing     .nav__dot { background: var(--writing); }

/* Группа кнопок справа */
.header__actions {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  flex-shrink: 0;
}

/* Бургер */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
  border-radius: var(--r-sm);
  transition: background var(--tr);
}
.hamburger:hover { background: var(--bg-alt2); }
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--tr);
}

/* Мобильное меню */
.mobile-menu {
  display: none;
  position: fixed;
  top: 62px;
  left: 0; right: 0; bottom: 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
  z-index: 150;
  padding: 1.5rem;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}
.mobile-menu.is-open { display: flex; }
.mobile-menu .nav__link { font-size: 1rem; padding: 10px 14px; }

/* ============================================================
   ГЕРОЯ (ГЛАВНАЯ)
   ============================================================ */
.hero {
  padding: 5rem 0 3.5rem;
  border-bottom: 1px solid var(--border-light);
  background: linear-gradient(160deg, #f5f8ff 0%, #eef1ff 40%, #fdf5ff 75%, var(--bg) 100%);
}

.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.12;
  color: var(--text);
  max-width: 700px;
  margin-bottom: 1.25rem;
}
.hero__title em {
  font-style: normal;
  background: linear-gradient(120deg, #5b50ea 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.75;
  margin-bottom: 2rem;
}

.hero__stats {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
}
.hero__stat-number {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.03em;
  display: block;
}
.hero__stat-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ============================================================
   СЕКЦИИ ГЛАВНОЙ
   ============================================================ */
.section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border-light);
}
.section:last-of-type { border-bottom: none; }

.section__header {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.section__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--r);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}
.section__icon--phonetics  { background: linear-gradient(135deg, var(--phonetics-light)  0%, #d1fae5 100%); }
.section__icon--grammar    { background: linear-gradient(135deg, var(--grammar-light)    0%, #ddd6fe 100%); }
.section__icon--vocabulary { background: linear-gradient(135deg, var(--vocabulary-light) 0%, #fef3c7 100%); }
.section__icon--writing    { background: linear-gradient(135deg, var(--writing-light)    0%, #fee2e2 100%); }

.section__cat {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 3px;
}
.section__cat--phonetics  { color: var(--phonetics); }
.section__cat--grammar    { color: var(--grammar); }
.section__cat--vocabulary { color: var(--vocabulary); }
.section__cat--writing    { color: var(--writing); }

.section__title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 3px;
}

.section__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ============================================================
   КАРТОЧКИ (ГЛАВНАЯ)
   ============================================================ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.4rem;
  transition: all var(--tr);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
}
.card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: var(--r-lg) var(--r-lg) 0 0;
  opacity: 0.3;
  transition: opacity var(--tr);
}
.card--phonetics::after  { background: var(--phonetics); }
.card--grammar::after    { background: var(--grammar); }
.card--vocabulary::after { background: var(--vocabulary); }
.card--writing::after    { background: var(--writing); }

.card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}
.card:hover::after { opacity: 1; }

.card--phonetics:hover  { box-shadow: 0 8px 30px rgba(5,150,105,0.2),   0 2px 8px rgba(0,0,0,0.04); }
.card--grammar:hover    { box-shadow: 0 8px 30px rgba(79,70,229,0.2),   0 2px 8px rgba(0,0,0,0.04); }
.card--vocabulary:hover { box-shadow: 0 8px 30px rgba(217,119,6,0.2),   0 2px 8px rgba(0,0,0,0.04); }
.card--writing:hover    { box-shadow: 0 8px 30px rgba(220,38,38,0.2),   0 2px 8px rgba(0,0,0,0.04); }

.card__emoji { font-size: 1.6rem; margin-bottom: 0.75rem; }

.card__title {
  font-size: 0.975rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.375rem;
  letter-spacing: -0.01em;
}

.card__desc {
  font-size: 0.825rem;
  color: var(--text-secondary);
  line-height: 1.55;
  flex: 1;
}

.card__cta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  transition: gap var(--tr);
}
.card--phonetics  .card__cta { color: var(--phonetics); }
.card--grammar    .card__cta { color: var(--grammar); }
.card--vocabulary .card__cta { color: var(--vocabulary); }
.card--writing    .card__cta { color: var(--writing); }
.card:hover .card__cta { gap: 8px; }

/* ============================================================
   ШАПКА СТРАНИЦЫ ТЕМЫ
   ============================================================ */
.topic-hero {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-secondary); font-weight: 500; }
.breadcrumb a:hover { color: var(--text); }
.breadcrumb__sep { color: var(--border); }

.topic-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.topic-badge--phonetics  { background: var(--phonetics-light);  color: var(--phonetics); }
.topic-badge--grammar    { background: var(--grammar-light);    color: var(--grammar); }
.topic-badge--vocabulary { background: var(--vocabulary-light); color: var(--vocabulary); }
.topic-badge--writing    { background: var(--writing-light);    color: var(--writing); }

.topic-title {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.18;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.topic-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 620px;
  line-height: 1.7;
}

/* ============================================================
   ДВУХКОЛОНОЧНЫЙ LAYOUT СТРАНИЦЫ ТЕМЫ
   ============================================================ */
.topic-layout {
  display: grid;
  grid-template-columns: 1fr 230px;
  gap: 3rem;
  align-items: start;
  padding: 2.5rem 0 4rem;
}

/* ============================================================
   TOC (СОДЕРЖАНИЕ СПРАВА)
   ============================================================ */
.toc {
  position: sticky;
  top: 82px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.25rem;
}

.toc__title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 0.875rem;
}

.toc__list { display: flex; flex-direction: column; gap: 2px; }

.toc__link {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding: 4px 8px;
  border-radius: var(--r-sm);
  transition: all var(--tr);
  line-height: 1.45;
}
.toc__link:hover { background: var(--bg-alt2); color: var(--text); }
.toc__link.active { background: var(--bg-alt2); color: var(--text); font-weight: 500; }

/* ============================================================
   ОБЛАСТЬ КОНТЕНТА
   ============================================================ */
.content {}

.content h2 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.022em;
  color: var(--text);
  margin: 2.5rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
  scroll-margin-top: 90px;
}
.content h2:first-child { margin-top: 0; border-top: none; padding-top: 0; }

.content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin: 1.75rem 0 0.6rem;
  letter-spacing: -0.01em;
  scroll-margin-top: 90px;
}

.content p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.72;
}

.content ul { list-style: disc; padding-left: 1.5rem; margin-bottom: 1rem; }
.content ol { list-style: decimal; padding-left: 1.5rem; margin-bottom: 1rem; }
.content li { color: var(--text-secondary); margin-bottom: 5px; line-height: 1.65; }

.content strong { color: var(--text); font-weight: 600; }

/* ============================================================
   ТАБЛИЦЫ
   ============================================================ */
.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }

thead { background: var(--bg-alt); }

th {
  text-align: left;
  padding: 10px 14px;
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
  vertical-align: top;
  line-height: 1.5;
}

tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--bg-alt); }

/* ============================================================
   ФОРМУЛЫ И КОД
   ============================================================ */
.formula {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 0.875rem 1.25rem;
  margin: 0.875rem 0;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}
.formula--phonetics  { border-left-color: var(--phonetics); }
.formula--grammar    { border-left-color: var(--grammar); }
.formula--vocabulary { border-left-color: var(--vocabulary); }
.formula--writing    { border-left-color: var(--writing); }

code {
  font-family: var(--font-mono);
  font-size: 0.84em;
  background: var(--bg-alt2);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

/* ============================================================
   БЛОКИ ПРИМЕРОВ
   ============================================================ */
.example {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1rem 1.25rem;
  margin: 0.875rem 0;
}

.example__label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 7px;
}

.ex-en {
  display: block;
  color: var(--text);
  font-style: italic;
  margin-bottom: 2px;
  line-height: 1.6;
}
.ex-ru {
  display: block;
  color: var(--text-tertiary);
  font-size: 0.84rem;
  line-height: 1.5;
}

/* ============================================================
   ВЫНОСКИ (NOTE / WARNING / TIP)
   ============================================================ */
.note, .warning, .tip {
  display: flex;
  gap: 0.875rem;
  padding: 0.9rem 1.2rem;
  border-radius: var(--r);
  margin: 1.25rem 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.note    { background: var(--accent-light);     border: 1px solid var(--accent-mid);      color: #3730a3; }
.warning { background: #fffbeb;                 border: 1px solid #fde68a;                color: #92400e; }
.tip     { background: var(--phonetics-light);  border: 1px solid var(--phonetics-mid);   color: #065f46; }

.note p, .warning p, .tip p { margin: 0; color: inherit; }

.callout-icon { font-size: 1rem; flex-shrink: 0; margin-top: 2px; }

/* ============================================================
   ПИЛЛЫ-МАРКЕРЫ (ключевые слова времён и т.д.)
   ============================================================ */
.markers {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0.5rem 0;
}

.marker {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.77rem;
  font-weight: 500;
  font-family: var(--font-mono);
  background: var(--grammar-light);
  color: var(--grammar);
  border: 1px solid var(--grammar-mid);
}
.marker--ph { background: var(--phonetics-light);  color: var(--phonetics);  border-color: var(--phonetics-mid); }
.marker--voc { background: var(--vocabulary-light); color: var(--vocabulary); border-color: var(--vocabulary-mid); }
.marker--wr  { background: var(--writing-light);    color: var(--writing);    border-color: var(--writing-mid); }

/* ============================================================
   ВСПОМОГАТЕЛЬНЫЕ УТИЛИТЫ
   ============================================================ */
.hl      { color: var(--accent);     font-weight: 600; }
.hl--ph  { color: var(--phonetics);  font-weight: 600; }
.hl--gr  { color: var(--grammar);    font-weight: 600; }
.hl--voc { color: var(--vocabulary); font-weight: 600; }
.hl--wr  { color: var(--writing);    font-weight: 600; }

.tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-alt2);
  border-radius: 100px;
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Разделитель секций */
.divider {
  height: 1px;
  background: var(--border-light);
  margin: 2rem 0;
}

/* Сетка двух колонок для сравнений */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1rem 0;
}
.two-col .box {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1rem 1.25rem;
}
.two-col .box__label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 0.6rem;
}
.two-col .box p { margin: 0; font-size: 0.875rem; }

/* ============================================================
   ПОДВАЛ (FOOTER)
   ============================================================ */
.footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  color: var(--text);
  font-size: 0.95rem;
}
.footer__logo:hover { color: var(--text); }

.footer__copy { font-size: 0.8rem; color: var(--text-tertiary); }

.footer__links { display: flex; gap: 1.5rem; }
.footer__links a {
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: color var(--tr);
}
.footer__links a:hover { color: var(--text); }

/* ============================================================
   КНОПКА «НАВЕРХ»
   ============================================================ */
.back-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, #5b50ea 0%, #9333ea 100%);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--tr), transform var(--tr);
  z-index: 50;
  box-shadow: 0 4px 14px rgba(91,80,234,0.45), 0 2px 6px rgba(147,51,234,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-top:hover { transform: translateY(-3px); }

/* ============================================================
   КНОПКА ПЕРЕКЛЮЧЕНИЯ ТЕМЫ
   ============================================================ */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--tr);
  flex-shrink: 0;
}
.theme-toggle:hover { background: var(--bg-alt2); color: var(--text); }

/* ============================================================
   ТЁМНАЯ ТЕМА
   ============================================================ */
[data-theme="dark"] {
  --bg:           #111318;
  --bg-alt:       #1a1f28;
  --bg-alt2:      #222838;
  --surface:      #1a1f28;
  --border:       #2e3547;
  --border-light: #1e2535;

  --text:           #e2e8f0;
  --text-secondary: #94a3b8;
  --text-tertiary:  #64748b;

  --accent-light: rgba(79,70,229,0.14);
  --accent-mid:   rgba(79,70,229,0.32);

  --phonetics-light: rgba(5,150,105,0.13);
  --phonetics-mid:   rgba(5,150,105,0.30);

  --grammar-light: rgba(79,70,229,0.13);
  --grammar-mid:   rgba(79,70,229,0.30);

  --vocabulary-light: rgba(217,119,6,0.13);
  --vocabulary-mid:   rgba(217,119,6,0.30);

  --writing-light: rgba(220,38,38,0.13);
  --writing-mid:   rgba(220,38,38,0.30);

  --shadow-sm:    0 1px 2px rgba(0,0,0,0.3);
  --shadow:       0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md:    0 4px 12px rgba(0,0,0,0.35);
  --shadow-hover: 0 8px 28px rgba(0,0,0,0.45), 0 2px 8px rgba(0,0,0,0.25);
}

[data-theme="dark"] .header {
  background: rgba(17,19,24,0.92);
}

[data-theme="dark"] .hero {
  background: linear-gradient(160deg, #13151f 0%, #14192e 40%, #160f20 75%, var(--bg) 100%);
}

[data-theme="dark"] code {
  background: var(--bg-alt2);
  color: #a5b4fc;
}

[data-theme="dark"] .note {
  background: rgba(79, 70, 229, 0.18);
  border-color: rgba(99, 90, 255, 0.40);
  color: #c4b5fd;
}
[data-theme="dark"] .warning {
  background: rgba(217, 119, 6, 0.18);
  border-color: rgba(217, 119, 6, 0.40);
  color: #fbbf24;
}
[data-theme="dark"] .tip {
  background: rgba(5, 150, 105, 0.18);
  border-color: rgba(5, 150, 105, 0.40);
  color: #6ee7b7;
}

/* ============================================================
   СТИЛИ ДЛЯ ПЕЧАТИ
   ============================================================ */
@media print {
  .header, .footer, .toc, .back-top, .theme-toggle,
  .hamburger, .mobile-menu { display: none !important; }

  body { font-size: 11pt; color: #000; background: #fff; }

  .container, .container--content { max-width: 100%; padding: 0; }

  .topic-layout { grid-template-columns: 1fr; }

  .topic-hero { border-bottom: 1px solid #ccc; padding: 1rem 0; }

  .topic-title { font-size: 18pt; }

  .content h2 { page-break-after: avoid; font-size: 14pt; border-top: 1px solid #ccc; }

  .content h3 { page-break-after: avoid; }

  .table-wrap { box-shadow: none; border: 1px solid #ccc; }

  table { font-size: 9pt; }

  .formula { border: 1px solid #ccc; background: #f8f8f8; }

  .example { border: 1px solid #ddd; background: #f8f8f8; }

  .note, .warning, .tip { border: 1px solid #ccc; background: #f8f8f8; color: #000; }

  .two-col { grid-template-columns: 1fr 1fr; }

  a { color: #000; text-decoration: none; }

  @page { margin: 1.5cm; }
}

/* ============================================================
   АДАПТИВНОСТЬ
   ============================================================ */
@media (max-width: 1024px) {
  .topic-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
}

@media (max-width: 768px) {
  .container { padding: 0 1.25rem; }

  .nav { display: none; }
  .hamburger { display: flex; }

  .hero { padding: 3rem 0 2rem; }
  .hero__stats { gap: 1.5rem; }

  .cards-grid { grid-template-columns: 1fr 1fr; }
  .section__header { flex-direction: column; gap: 0.875rem; }

  .two-col { grid-template-columns: 1fr; }

  /* Контентная колонка: не растягивать грид за пределы экрана */
  .content { min-width: 0; }

  /* Таблицы на мобильном: компактнее */
  th {
    font-size: 0.7rem;
    padding: 7px 10px;
    white-space: normal;
  }
  td {
    font-size: 0.78rem;
    padding: 7px 10px;
  }

  /* Fade-индикатор: таблица шире экрана */
  .table-wrap.is-scrollable {
    box-shadow:
      inset -56px 0 28px -16px rgba(255,255,255,0.97),
      var(--shadow-sm);
  }
  [data-theme="dark"] .table-wrap.is-scrollable {
    box-shadow:
      inset -56px 0 28px -16px rgba(17,19,24,0.97),
      var(--shadow-sm);
  }
}

@media (max-width: 480px) {
  .cards-grid { grid-template-columns: 1fr; }
  .footer__inner { flex-direction: column; align-items: flex-start; }
  .hero__stats { gap: 1.25rem; }
}

/* ============================================================
   ПОИСК
   ============================================================ */
.search-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--tr);
  flex-shrink: 0;
}
.search-btn:hover { background: var(--bg-alt2); color: var(--text); }

.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.48);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 8vh 1rem 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
}
.search-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.search-modal {
  width: 100%;
  max-width: 600px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-hover);
  overflow: hidden;
  max-height: 76vh;
  display: flex;
  flex-direction: column;
  transform: translateY(-10px) scale(0.99);
  transition: transform 0.15s ease;
}
.search-overlay.is-open .search-modal {
  transform: translateY(0) scale(1);
}

.search-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.search-header-icon { font-size: 1rem; color: var(--text-tertiary); flex-shrink: 0; }

.search-input {
  flex: 1;
  border: none;
  background: none;
  font-family: var(--font);
  font-size: 1rem;
  color: var(--text);
  outline: none;
}
.search-input::placeholder { color: var(--text-tertiary); }

.search-close {
  width: 28px;
  height: 28px;
  border: none;
  background: var(--bg-alt2);
  border-radius: var(--r-sm);
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--tr);
  flex-shrink: 0;
}
.search-close:hover { background: var(--border); color: var(--text); }

.search-results {
  overflow-y: auto;
  flex: 1;
  padding: 0.5rem;
}

.search-result {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  padding: 0.7rem 0.875rem;
  border-radius: var(--r);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: background var(--tr);
}
.search-result:hover, .search-result.focused { background: var(--bg-alt); }

.search-result__emoji {
  font-size: 1.3rem;
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-result__body { flex: 1; min-width: 0; }

.search-result__top {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2px;
  flex-wrap: wrap;
}

.search-result__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.search-result__cat {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 1px 7px;
  border-radius: 100px;
  flex-shrink: 0;
}
.search-result__cat--phonetics  { background: var(--phonetics-light);  color: var(--phonetics); }
.search-result__cat--grammar    { background: var(--grammar-light);    color: var(--grammar); }
.search-result__cat--vocabulary { background: var(--vocabulary-light); color: var(--vocabulary); }
.search-result__cat--writing    { background: var(--writing-light);    color: var(--writing); }

.search-result__desc {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  line-height: 1.45;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-empty {
  padding: 3rem 1rem;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.9rem;
}
.search-empty-icon { font-size: 2rem; margin-bottom: 0.5rem; }

.search-hint {
  padding: 0.5rem 1.25rem;
  font-size: 0.7rem;
  color: var(--text-tertiary);
  border-top: 1px solid var(--border-light);
  flex-shrink: 0;
  letter-spacing: 0.01em;
}

@media (max-width: 640px) {
  .search-overlay { padding-top: 0; align-items: flex-start; }
  .search-modal { border-radius: 0 0 var(--r-xl) var(--r-xl); max-height: 85vh; }
  .search-hint { display: none; }
}

/* ============================================================
   ПОХОЖИЕ ТЕМЫ
   ============================================================ */
.related-topics {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--border-light);
  background: var(--bg);
}

.related-topics__title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 1rem;
}

.related-topics__grid {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.related-topic-card {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--r);
  text-decoration: none;
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--tr);
}
.related-topic-card--phonetics:hover  { border-color: var(--phonetics);  color: var(--phonetics);  background: var(--phonetics-light); }
.related-topic-card--grammar:hover    { border-color: var(--grammar);    color: var(--grammar);    background: var(--grammar-light); }
.related-topic-card--vocabulary:hover { border-color: var(--vocabulary); color: var(--vocabulary); background: var(--vocabulary-light); }
.related-topic-card--writing:hover    { border-color: var(--writing);    color: var(--writing);    background: var(--writing-light); }

.related-topic-card__emoji { font-size: 1rem; flex-shrink: 0; }

/* ============================================================
   ШАПКА ТЕМЫ — ГРАДИЕНТ ПО КАТЕГОРИИ
   ============================================================ */
.topic-hero:has(.topic-badge--phonetics)  { background: linear-gradient(160deg, var(--phonetics-light)  0%, #f0fdf8 55%, var(--bg) 100%); }
.topic-hero:has(.topic-badge--grammar)    { background: linear-gradient(160deg, var(--grammar-light)    0%, #f0f2ff 55%, var(--bg) 100%); }
.topic-hero:has(.topic-badge--vocabulary) { background: linear-gradient(160deg, var(--vocabulary-light) 0%, #fefce8 55%, var(--bg) 100%); }
.topic-hero:has(.topic-badge--writing)    { background: linear-gradient(160deg, var(--writing-light)    0%, #fff1f2 55%, var(--bg) 100%); }

[data-theme="dark"] .topic-hero:has(.topic-badge--phonetics)  { background: linear-gradient(160deg, rgba(5,150,105,0.10)  0%, rgba(5,150,105,0.04)  55%, var(--bg) 100%); }
[data-theme="dark"] .topic-hero:has(.topic-badge--grammar)    { background: linear-gradient(160deg, rgba(79,70,229,0.10)  0%, rgba(79,70,229,0.04)  55%, var(--bg) 100%); }
[data-theme="dark"] .topic-hero:has(.topic-badge--vocabulary) { background: linear-gradient(160deg, rgba(217,119,6,0.10)  0%, rgba(217,119,6,0.04)  55%, var(--bg) 100%); }
[data-theme="dark"] .topic-hero:has(.topic-badge--writing)    { background: linear-gradient(160deg, rgba(220,38,38,0.10)  0%, rgba(220,38,38,0.04)  55%, var(--bg) 100%); }

/* ============================================================
   КАРТОЧКИ — ЛЁГКИЙ ФОН КАТЕГОРИИ
   ============================================================ */
.card--phonetics  { background: linear-gradient(175deg, rgba(5,150,105,0.05)  0%, var(--surface) 50%); }
.card--grammar    { background: linear-gradient(175deg, rgba(79,70,229,0.05)  0%, var(--surface) 50%); }
.card--vocabulary { background: linear-gradient(175deg, rgba(217,119,6,0.05)  0%, var(--surface) 50%); }
.card--writing    { background: linear-gradient(175deg, rgba(220,38,38,0.05)  0%, var(--surface) 50%); }

/* ============================================================
   БЛОКИ ПРИМЕРОВ — ЦВЕТНАЯ ЛЕВАЯ ГРАНИЦА ПО КАТЕГОРИИ
   ============================================================ */
body:has(.topic-badge--phonetics)  .example { border-left: 3px solid var(--phonetics); }
body:has(.topic-badge--grammar)    .example { border-left: 3px solid var(--grammar); }
body:has(.topic-badge--vocabulary) .example { border-left: 3px solid var(--vocabulary); }
body:has(.topic-badge--writing)    .example { border-left: 3px solid var(--writing); }

/* ============================================================
   TOC — АКТИВНЫЙ ПУНКТ С ЦВЕТОМ КАТЕГОРИИ
   ============================================================ */
body:has(.topic-badge--phonetics)  .toc__link.active { box-shadow: inset 2px 0 0 var(--phonetics);  color: var(--phonetics);  background: var(--phonetics-light); }
body:has(.topic-badge--grammar)    .toc__link.active { box-shadow: inset 2px 0 0 var(--grammar);    color: var(--grammar);    background: var(--grammar-light); }
body:has(.topic-badge--vocabulary) .toc__link.active { box-shadow: inset 2px 0 0 var(--vocabulary); color: var(--vocabulary); background: var(--vocabulary-light); }
body:has(.topic-badge--writing)    .toc__link.active { box-shadow: inset 2px 0 0 var(--writing);    color: var(--writing);    background: var(--writing-light); }

/* ============================================================
   АНИМАЦИЯ КАРТОЧЕК (управляется флагом ANIMATE_CARDS в components.js)
   ============================================================ */
@keyframes card-in {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
.card-animate { opacity: 0; }
.card-animate.is-visible {
  animation: card-in 0.4s ease forwards;
  animation-delay: var(--card-delay, 0s);
}