/* Импорт современного читаемого шрифта */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* Цветовая палитра Slate/Blue/Emerald (комфортная для глаз) */
:root {
  --font-primary: 'Inter', sans-serif;
  --font-title: 'Outfit', sans-serif;
  
  --bg-darkest: #090d16;       /* Глубокий темный */
  --bg-dark: #0f172a;          /* Slate 900 - мягкий темно-серый фон */
  --bg-card: rgba(30, 41, 59, 0.4); /* Slate 800 с полупрозрачностью */
  --border-glass: rgba(255, 255, 255, 0.05);
  --border-active: rgba(14, 165, 233, 0.4); /* Мягкий голубой */
  
  --color-primary: #38bdf8;    /* Не-слепящий бирюзовый (Sky 400) */
  --color-secondary: #6366f1;  /* Мягкий индиго */
  --color-success: #34d399;    /* Изумрудный (Emerald 400) */
  --color-warning: #fbbf24;    /* Янтарный */
  --color-error: #f87171;      /* Мягкий красный */
  
  --text-main: #cbd5e1;        /* Slate 300 - легкий контраст для длинного текста */
  --text-title: #f8fafc;       /* Slate 50 - яркий для заголовков */
  --text-muted: #64748b;       /* Slate 500 */
  --text-light: #ffffff;
  
  --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.25);
  --shadow-active: 0 0 15px rgba(56, 189, 248, 0.15);
}

/* Сброс базовых стилей */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-dark);
  color: var(--text-main);
  background-image: 
    radial-gradient(circle at 5% 5%, rgba(56, 189, 248, 0.02) 0%, transparent 35%),
    radial-gradient(circle at 95% 95%, rgba(99, 102, 241, 0.02) 0%, transparent 35%);
  background-attachment: fixed;
  line-height: 1.7; /* Увеличенная высота строк для комфортного чтения */
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Хедер и логотип */
header {
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.logo-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  flex-shrink: 0;
  cursor: pointer;
}

.logo-title {
  font-family: var(--font-title);
  font-size: 1.35rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.1rem;
  line-height: 1.1;
  letter-spacing: -0.5px;
}

.logo-emoji {
  margin-right: 0.25rem;
  font-size: 1.25rem;
}

.logo-vb {
  color: #3b82f6; /* Синий */
}

.logo-2 {
  color: #f59e0b; /* Желтый */
}

.logo-bas {
  color: #e5e7eb; /* Серый */
}

.logo-subtitle {
  font-size: 10px;
  color: var(--text-muted);
  line-height: 1.2;
  margin-top: 2px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-family: var(--font-primary);
}

/* Навигационные вкладки */
.nav-tabs {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  scrollbar-width: none; /* Скрытие скроллбара в Firefox */
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
}

.nav-tabs::-webkit-scrollbar {
  display: none; /* Скрытие скроллбара в Chrome/Safari */
}

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 0.6rem 1.1rem;
  border-radius: 8px;
  cursor: pointer;
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 0.85rem;
  transition: var(--transition-smooth);
  white-space: nowrap; /* Важно для горизонтальной прокрутки */
  user-select: none;
}

.tab-btn:hover {
  color: var(--text-title);
  background: rgba(255, 255, 255, 0.03);
}

.tab-btn.active {
  color: var(--color-primary);
  background: rgba(56, 189, 248, 0.08);
  border-color: var(--border-active);
  box-shadow: var(--shadow-active);
}

/* Основной контейнер */
main {
  max-width: 1000px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

/* Скрытые разделы */
.tab-content {
  display: none;
  animation: fadeIn 0.3s ease-out;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Общий стиль стеклянных карточек (Glassmorphism) */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-smooth);
}

.glass-panel:hover {
  border-color: rgba(56, 189, 248, 0.15);
}

/* Поисковая строка */
.search-container {
  display: flex;
  gap: 1rem;
}

.search-input {
  flex: 1;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  color: var(--text-title);
  padding: 0.9rem 1.2rem;
  font-family: var(--font-primary);
  font-size: 1rem;
  outline: none;
  transition: var(--transition-smooth);
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-active);
}

/* Стили Интерактивного Мастера Диагностики (Wizard) */
.wizard-box {
  min-height: 250px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 1rem 0;
  width: 100%;
}

.wizard-question {
  font-family: var(--font-title);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text-title);
  text-align: center;
  max-width: 800px;
  line-height: 1.4;
}

.wizard-options {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  width: 100%;
  max-width: 650px;
}

.option-btn {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 1.1rem 1.3rem;
  border-radius: 12px;
  cursor: pointer;
  font-family: var(--font-primary);
  font-size: 0.95rem;
  font-weight: 500;
  text-align: left;
  line-height: 1.4;
  transition: var(--transition-smooth);
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 54px; /* Оптимальная высота для пальца на мобильных */
}

.option-btn:hover {
  background: rgba(56, 189, 248, 0.05);
  border-color: var(--color-primary);
  color: var(--text-title);
}

.option-arrow {
  color: var(--color-primary);
  font-size: 1.1rem;
  opacity: 0.5;
  transition: var(--transition-smooth);
  margin-left: 1rem;
  flex-shrink: 0;
}

.option-btn:hover .option-arrow {
  opacity: 1;
  transform: translateX(4px);
}

/* Карточка решения в мастере */
.solution-card {
  width: 100%;
  max-width: 800px;
  animation: slideUp 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.solution-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-glass);
}

.solution-title {
  font-family: var(--font-title);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-title);
  line-height: 1.3;
}

.solution-badge {
  padding: 0.25rem 0.7rem;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.badge-error { background: rgba(248, 113, 113, 0.1); color: var(--color-error); border: 1px solid rgba(248, 113, 113, 0.2); }
.badge-warning { background: rgba(251, 191, 36, 0.1); color: var(--color-warning); border: 1px solid rgba(251, 191, 36, 0.2); }
.badge-success { background: rgba(52, 211, 153, 0.1); color: var(--color-success); border: 1px solid rgba(52, 211, 153, 0.2); }

.solution-desc {
  font-size: 1rem;
  margin-bottom: 1.5rem;
  color: var(--text-title);
  border-left: 3px solid var(--color-primary);
  padding-left: 0.75rem;
}

.solution-steps {
  list-style-type: none;
  margin-top: 1rem;
}

.solution-steps li {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 1.1rem;
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.6;
}

.solution-steps li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 3px;
  width: 18px;
  height: 18px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 0.7rem;
  font-weight: bold;
}

.reset-btn {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border: none;
  color: var(--text-title);
  padding: 0.8rem 1.6rem;
  border-radius: 10px;
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  margin-top: 1.5rem;
  transition: var(--transition-smooth);
}

.reset-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.25);
}

/* Номенклатура компонентов БАС (Справочник) */
.nomenclature-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
}

.nomenclature-sidebar {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.category-link {
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  padding: 0.85rem 1rem;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: var(--transition-smooth);
  font-weight: 600;
  font-size: 0.9rem;
  min-height: 48px;
}

.category-link:hover {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-title);
}

.category-link.active {
  background: rgba(56, 189, 248, 0.05);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.component-card {
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.component-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.85rem;
  gap: 1rem;
}

.component-name {
  font-family: var(--font-title);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-title);
}

.component-code {
  font-family: monospace;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--color-primary);
  flex-shrink: 0;
}

.component-details p {
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  line-height: 1.6;
}

.component-details strong {
  color: var(--text-title);
}

/* База типовых неисправностей (Кейсы) */
.cases-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.case-card {
  border-left: 3px solid var(--color-primary);
}

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.5rem 0 1rem 0;
  font-size: 0.8rem;
}

.case-label {
  background: rgba(255, 255, 255, 0.04);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.case-sections {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 1rem;
  border-top: 1px solid var(--border-glass);
  padding-top: 1rem;
}

.case-sect-title {
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-title);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.case-sect-list {
  padding-left: 1.1rem;
  font-size: 0.88rem;
  color: var(--text-main);
  line-height: 1.6;
}

.case-sect-list li {
  margin-bottom: 0.35rem;
}

/* Редкие сбои (Edge Cases) */
.rare-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
}

.rare-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.rare-title {
  font-family: var(--font-title);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.85rem;
  line-height: 1.3;
}

.rare-physics {
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

.rare-solution {
  background: rgba(52, 211, 153, 0.03);
  border-left: 2px solid var(--color-success);
  padding: 0.85rem;
  border-radius: 0 8px 8px 0;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-title);
}

/* Анимация прокрутки */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================
   ЦЕПОЧКИ ДИАГНОСТИКИ (CHAINS) — РЕДИЗАЙН ВО ВСЮ ШИРИНУ
   ========================================== */
.chains-list-view {
  animation: fadeIn 0.3s ease-out;
}

.chains-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  width: 100%;
}

/* Стилизация кнопок-чипсов фильтрации, вынесенных наружу */
.chains-filter-bar .tab-btn {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-glass);
  padding: 0.55rem 1.1rem;
  border-radius: 20px; /* Круглые пилюли */
  font-size: 0.8rem;
  color: var(--text-main);
  transition: var(--transition-smooth);
}

.chains-filter-bar .tab-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-title);
}

.chains-filter-bar .tab-btn.active {
  color: var(--color-primary);
  background: rgba(56, 189, 248, 0.08);
  border-color: var(--border-active);
  box-shadow: var(--shadow-active);
}

.chains-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.chain-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: 14px;
  padding: 1.25rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 140px;
  box-shadow: var(--shadow-subtle);
  animation: slideUp 0.3s ease-out;
}

.chain-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-primary);
  box-shadow: 0 8px 25px rgba(56, 189, 248, 0.12);
  background: rgba(30, 41, 59, 0.6);
}

.chain-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.85rem;
}

.chain-card-num {
  font-family: monospace;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--color-primary);
  background: rgba(56, 189, 248, 0.08);
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  border: 1px solid rgba(56, 189, 248, 0.15);
}

.chain-card-cat {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.chain-card-title {
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-title);
  line-height: 1.4;
  margin-top: auto;
}

.back-to-list-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.back-to-list-btn:hover {
  background: rgba(56, 189, 248, 0.08);
  border-color: var(--border-active);
  color: var(--color-primary);
  transform: translateX(-2px);
}

.back-to-list-btn span {
  font-size: 1.1rem;
}

.chains-detail-view {
  animation: fadeIn 0.3s ease-out;
}

.markdown-body {
  line-height: 1.8;
  color: var(--text-main);
  max-width: 850px;
  margin: 0 auto;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  font-family: var(--font-title);
  color: var(--text-title);
  margin-top: 1.5rem;
  margin-bottom: 0.85rem;
  font-weight: 700;
}

.markdown-body h1 { font-size: 1.8rem; border-bottom: 1px solid var(--border-glass); padding-bottom: 0.5rem; }
.markdown-body h2 { font-size: 1.4rem; }
.markdown-body h3 { font-size: 1.15rem; }

.markdown-body p {
  margin-bottom: 1.1rem;
}

.markdown-body ul, .markdown-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.1rem;
}

.markdown-body li {
  margin-bottom: 0.5rem;
}

.markdown-body pre {
  background: rgba(15, 23, 42, 0.7);
  padding: 1rem;
  border-radius: 10px;
  border: 1px solid var(--border-glass);
  overflow-x: auto;
  margin-bottom: 1.1rem;
}

.markdown-body code {
  font-family: monospace;
  font-size: 0.9rem;
}

.markdown-body a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px dashed rgba(56, 189, 248, 0.3);
  transition: var(--transition-smooth);
}

.markdown-body a:hover {
  color: var(--text-title);
  border-bottom-color: var(--text-title);
}

/* ==========================================
   МОБИЛЬНАЯ АДАПТАЦИЯ (RESPONSIVE DESIGN)
   ========================================== */
@media (max-width: 768px) {
  /* Заголовок сайта */
  header {
    flex-direction: column;
    padding: 0.75rem 1rem;
    align-items: stretch;
    gap: 0.75rem;
  }

  .logo-container {
    align-items: center;
    text-align: center;
  }

  .logo-title {
    justify-content: center;
    font-size: 1.2rem;
  }

  .logo-subtitle {
    font-size: 9px;
  }

  /* Меню вкладок на мобильных (перенос для наглядности) */
  .nav-tabs {
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.35rem;
    padding-bottom: 0;
  }
  
  .tab-btn {
    padding: 0.55rem 0.95rem;
    font-size: 0.82rem;
    min-height: 40px;
  }

  main {
    margin: 1rem auto;
  }

  .glass-panel {
    padding: 1.25rem;
    margin-bottom: 1rem;
    border-radius: 12px;
  }

  /* Номенклатура компонентов на мобильных */
  .nomenclature-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .nomenclature-sidebar {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.4rem;
    padding-bottom: 0;
  }

  .category-link {
    font-size: 0.8rem;
    padding: 0.6rem 0.85rem;
    min-height: 38px;
    border-radius: 8px;
  }

  /* Сетка карточек цепочек на мобильных */
  .chains-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  /* Списковые сетки */
  .case-sections {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .rare-grid {
    grid-template-columns: 1fr;
  }

  .wizard-question {
    font-size: 1.15rem;
    margin-bottom: 1.5rem;
  }

  .option-btn {
    padding: 0.9rem 1.1rem;
    font-size: 0.9rem;
    min-height: 48px;
    border-radius: 10px;
  }

  .solution-title {
    font-size: 1.15rem;
  }

  .solution-desc {
    font-size: 0.95rem;
  }
}
.share-btn { background: rgba(59, 130, 246, 0.1); color: var(--color-primary); border: 1px solid rgba(59, 130, 246, 0.3); padding: 0.6rem 1rem; border-radius: 8px; cursor: pointer; font-family: inherit; font-weight: 500; display: flex; align-items: center; gap: 0.5rem; transition: all 0.3s ease; } .share-btn:hover { background: rgba(59, 130, 246, 0.2); transform: translateY(-1px); }