/* ===== УНИВЕРСАЛЬНАЯ СИСТЕМА ЛЕЙАУТОВ ===== */
/* Объединение стилей index.html и subject_view.html */

/* ===== ОБЩИЕ ПЕРЕМЕННЫЕ ===== */
:root {
  --layout-header-height: 72px;
  --layout-sidebar-width: 320px;
  --layout-right-column-width: 280px;
  --layout-gap: 2rem;
  --layout-padding: 1.5rem;
}

/* ===== БАЗОВЫЕ КОНТЕЙНЕРЫ ===== */
/* Универсальный контейнер для всех страниц */
.page-container {
  min-height: calc(100vh - var(--layout-header-height));
  position: relative;
  overflow: hidden;
}

/* Фоны для разных типов страниц */
.page-container.hero-layout {
  /* background: var(--bg-gradient); */
}

.page-container.three-column-layout {
  /* background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); */
}

.page-container.dashboard-layout {
  /* background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%); */
}

/* ===== ДЕКОРАТИВНЫЕ ЭЛЕМЕНТЫ ===== */
.page-container::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: 
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(62, 205, 193, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(108, 92, 231, 0.1) 0%, transparent 70%);
  animation: gentle-float 20s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: 0;
}

.page-container::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.02) 50%, transparent 70%);
  animation: shimmer 15s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

/* ===== LAYOUT СИСТЕМЫ ===== */

/* 1. HERO LAYOUT (index.html style) */
.hero-layout .layout-content {
  position: relative;
  z-index: 1;
  padding: var(--layout-padding);
  max-width: 1200px;
  margin: 0 auto;
}

/* 2. THREE COLUMN LAYOUT (subject_view.html style) */
.three-column-layout .layout-content {
  display: flex;
  height: calc(100vh - var(--layout-header-height));
  position: relative;
  z-index: 1;
}

.three-column-layout .left-column {
  width: var(--layout-sidebar-width);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border-right: 1px solid rgba(255, 255, 255, 0.2);
  padding: var(--layout-padding);
  overflow-y: auto;
  flex-shrink: 0;
}

.three-column-layout .middle-column {
  flex: 1;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  padding: var(--layout-padding);
  overflow-y: auto;
}

.three-column-layout .right-column {
  width: var(--layout-right-column-width);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border-left: 1px solid rgba(255, 255, 255, 0.2);
  padding: var(--layout-padding);
  overflow-y: auto;
  flex-shrink: 0;
}

/* ===== УНИВЕРСАЛЬНЫЕ КОМПОНЕНТЫ ===== */

/* Секции */
.universal-section {
  margin-bottom: var(--layout-gap);
  padding: var(--layout-padding);
  background: var(--bg-surface-alpha);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

/* Заголовки секций */
.section-header {
  margin-bottom: 1.5rem;
}

.section-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.section-header.glass-style {
  background: rgba(255, 255, 255, 0.05);
  padding: var(--layout-padding);
  border-radius: var(--border-radius-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.section-header.glass-style h2 {
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Универсальные карточки */
.universal-card {
  background: var(--bg-surface-alpha);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--layout-padding);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.universal-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

.universal-card.glass-style {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: white;
}

.universal-card.glass-style:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.4);
}

/* Универсальные кнопки */
.universal-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--primary-gradient);
  color: white;
  border: none;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.universal-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: white;
}

.universal-button.glass-style {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.universal-button.glass-style:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* ===== НАВИГАЦИОННЫЕ ЭЛЕМЕНТЫ ===== */
.navigation-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.navigation-item {
  margin-bottom: 0.75rem;
}

.navigation-button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-lg);
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: left;
  backdrop-filter: blur(10px);
}

.navigation-button:hover {
  transform: translateY(-2px) scale(1.02);
  border-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* Цветовые варианты для навигации */
.navigation-button.blue {
  background: linear-gradient(135deg, #3498db, #2980b9);
  box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.navigation-button.purple {
  background: linear-gradient(135deg, #9b59b6, #8e44ad);
  box-shadow: 0 4px 15px rgba(155, 89, 182, 0.3);
}

.navigation-button.teal {
  background: linear-gradient(135deg, #1abc9c, #16a085);
  box-shadow: 0 4px 15px rgba(26, 188, 156, 0.3);
}

.navigation-button.red {
  background: linear-gradient(135deg, #e74c3c, #c0392b);
  box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
}

.navigation-button.orange {
  background: linear-gradient(135deg, #f39c12, #e67e22);
  box-shadow: 0 4px 15px rgba(243, 156, 18, 0.3);
}

.navigation-button.gradient {
  background: linear-gradient(135deg, #667eea, #764ba2);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

/* ===== СТАТИСТИЧЕСКИЕ ЭЛЕМЕНТЫ ===== */
.stats-container {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.stat-card {
  background: var(--bg-surface-alpha);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: all 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  flex-shrink: 0;
}

.stat-content {
  flex: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* ===== ПРОГРЕСС ЭЛЕМЕНТЫ ===== */
.progress-container {
  margin: 1rem 0;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary-gradient);
  border-radius: 4px;
  transition: width 0.3s ease;
}

.progress-circle {
  width: 120px;
  height: 120px;
  position: relative;
  margin: 0 auto;
}

.circle-background,
.circle-progress {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  position: absolute;
  top: 0;
  left: 0;
}

.circle-background {
  background: conic-gradient(from 0deg, var(--bg-secondary) 0deg, var(--bg-secondary) 360deg);
}

.circle-progress {
  background: conic-gradient(from 0deg, var(--primary-color) 0deg, transparent 0deg);
  transition: background 0.3s ease;
}

.circle-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* ===== АНИМАЦИИ ===== */
@keyframes gentle-float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(-20px, -20px) rotate(1deg); }
}

@keyframes shimmer {
  0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
  100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

/* ===== АДАПТИВНОСТЬ ===== */
@media (max-width: 1024px) {
  .three-column-layout .right-column {
    display: none;
  }
  
  .three-column-layout .middle-column {
    border-right: none;
  }
}

@media (max-width: 768px) {
  .three-column-layout .layout-content {
    flex-direction: column;
    height: auto;
  }
  
  .three-column-layout .left-column {
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  }
  
  .three-column-layout .middle-column {
    width: 100%;
    border-right: none;
  }
  
  :root {
    --layout-sidebar-width: 100%;
    --layout-right-column-width: 100%;
    --layout-padding: 1rem;
  }
}

/* ===== ТЕМЫ ===== */
[data-theme="dark"] .page-container.dashboard-layout {
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

[data-theme="gradient"] .page-container {
  background: var(--gradient-bg);
}