/* UltraThink Design System - 超薄精緻設計美學 */

/* ========== 設計哲學 ========== */
/* 
 * UltraThink: 極致輕薄、精緻細膩、現代優雅
 * - 超薄邊框與線條
 * - 微妙的漸層與陰影
 * - 精心設計的負空間
 * - 流暢的微動畫
 * - 高級感的色彩系統
 */

/* ========== CSS Reset & Base ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ========== 設計系統變數 ========== */
:root {
  /* 色彩系統 - 精緻漸層色板 */
  --ultra-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --ultra-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --ultra-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --ultra-success: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  --ultra-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  
  /* 單色系統 */
  --color-primary: #667eea;
  --color-primary-light: #a5b4fc;
  --color-primary-dark: #4c1d95;
  --color-accent: #4facfe;
  --color-text: #1a1a2e;
  --color-text-light: #64748b;
  --color-text-lighter: #94a3b8;
  
  /* 背景系統 - 微妙漸層 */
  --bg-main: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  --bg-card: linear-gradient(145deg, #ffffff, #fafbff);
  --bg-hover: linear-gradient(145deg, #f8f9ff, #ffffff);
  --bg-glass: rgba(255, 255, 255, 0.7);
  
  /* 超薄邊框 */
  --border-ultra-thin: 0.5px;
  --border-thin: 1px;
  --border-color: rgba(148, 163, 184, 0.2);
  --border-color-hover: rgba(102, 126, 234, 0.3);
  
  /* 精緻陰影 */
  --shadow-ultra: 0 0.5px 1px rgba(0, 0, 0, 0.04);
  --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-large: 0 10px 40px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.15);
  
  /* 間距系統 - 黃金比例 */
  --space-xs: 0.382rem;
  --space-sm: 0.618rem;
  --space-md: 1rem;
  --space-lg: 1.618rem;
  --space-xl: 2.618rem;
  --space-2xl: 4.236rem;
  
  /* 圓角系統 */
  --radius-sm: 0.382rem;
  --radius-md: 0.618rem;
  --radius-lg: 1rem;
  --radius-xl: 1.618rem;
  --radius-2xl: 2.618rem;
  --radius-full: 9999px;
  
  /* 動畫時間 */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --duration-slower: 600ms;
  
  /* 動畫曲線 */
  --ease-spring: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ========== 全域樣式 ========== */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-weight: 400;
  line-height: 1.618;
  color: var(--color-text);
  background: var(--bg-main);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 選取文字樣式 */
::selection {
  background: var(--color-primary-light);
  color: white;
}

/* ========== UltraThink 導航欄 ========== */
.ultra-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: var(--border-ultra-thin) solid var(--border-color);
  z-index: 1000;
  transition: all var(--duration-normal) var(--ease-smooth);
}

.ultra-nav.scrolled {
  box-shadow: var(--shadow-soft);
  background: rgba(255, 255, 255, 0.9);
}

.ultra-nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.ultra-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 600;
  background: var(--ultra-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: all var(--duration-normal) var(--ease-smooth);
}

.ultra-logo:hover {
  transform: translateX(2px);
}

.ultra-logo-icon {
  width: 32px;
  height: 32px;
  background: var(--ultra-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
  box-shadow: var(--shadow-soft);
}

/* 搜尋欄 */
.ultra-search {
  flex: 0 1 500px;
  margin: 0 var(--space-xl);
}

.ultra-search-box {
  position: relative;
}

.ultra-search-input {
  width: 100%;
  padding: var(--space-sm) var(--space-lg);
  padding-left: 2.5rem;
  background: rgba(249, 250, 251, 0.8);
  border: var(--border-thin) solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  color: var(--color-text);
  transition: all var(--duration-normal) var(--ease-smooth);
}

.ultra-search-input:focus {
  outline: none;
  background: white;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1), var(--shadow-soft);
}

.ultra-search-icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-lighter);
  pointer-events: none;
}

/* 導航選單 */
.ultra-nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.ultra-nav-link {
  position: relative;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: all var(--duration-normal) var(--ease-smooth);
  overflow: hidden;
}

.ultra-nav-link::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: var(--ultra-primary);
  border-radius: var(--radius-full);
  transform: translate(-50%, -50%);
  transition: all var(--duration-slow) var(--ease-smooth);
  opacity: 0.1;
}

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

.ultra-nav-link:hover::before {
  width: 100%;
  height: 100%;
}

/* ========== 主要內容區 ========== */
.ultra-main {
  padding-top: 60px;
  min-height: 100vh;
}

.ultra-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
}

/* ========== 英雄區塊 ========== */
.ultra-hero {
  padding: var(--space-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.ultra-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(102, 126, 234, 0.05) 0%, transparent 70%);
  animation: rotate 30s linear infinite;
}

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

.ultra-hero-title {
  font-size: 3rem;
  font-weight: 300;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
  background: var(--ultra-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  z-index: 1;
}

.ultra-hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-light);
  font-weight: 300;
  position: relative;
  z-index: 1;
}

/* ========== 影片網格 ========== */
.ultra-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

/* 影片卡片 */
.ultra-card {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: var(--border-ultra-thin) solid var(--border-color);
  transition: all var(--duration-slow) var(--ease-smooth);
  cursor: pointer;
  transform-style: preserve-3d;
}

.ultra-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-large);
  border-color: var(--border-color-hover);
}

.ultra-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--ultra-accent);
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-smooth);
  z-index: 1;
}

.ultra-card:hover::before {
  opacity: 0.03;
}

/* 縮圖區域 */
.ultra-thumbnail {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.ultra-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slower) var(--ease-smooth);
}

.ultra-card:hover .ultra-thumbnail img {
  transform: scale(1.1);
}

/* 播放按鈕 */
.ultra-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 60px;
  height: 60px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-large);
  transition: all var(--duration-normal) var(--ease-spring);
  z-index: 2;
}

.ultra-card:hover .ultra-play {
  transform: translate(-50%, -50%) scale(1);
}

.ultra-play-icon {
  width: 0;
  height: 0;
  border-left: 18px solid var(--color-primary);
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 4px;
}

/* 時長標籤 */
.ultra-duration {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-sm);
  padding: 4px 8px;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  backdrop-filter: blur(10px);
  z-index: 2;
}

/* 品質標籤 */
.ultra-quality {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  padding: 4px 8px;
  background: var(--ultra-secondary);
  color: white;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-soft);
  z-index: 2;
}

/* 卡片內容 */
.ultra-card-content {
  padding: var(--space-lg);
  position: relative;
  z-index: 2;
}

.ultra-card-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--duration-normal) var(--ease-smooth);
}

.ultra-card:hover .ultra-card-title {
  color: var(--color-primary);
}

.ultra-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.8125rem;
  color: var(--color-text-lighter);
}

.ultra-meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.ultra-meta-icon {
  width: 14px;
  height: 14px;
  opacity: 0.6;
}

/* ========== 播放器頁面 ========== */
.ultra-player-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-xl);
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
}

.ultra-player-main {
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: var(--border-ultra-thin) solid var(--border-color);
  box-shadow: var(--shadow-soft);
}

.ultra-video-player {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  position: relative;
}

.ultra-video-player iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.ultra-player-info {
  padding: var(--space-xl);
}

.ultra-player-title {
  font-size: 1.75rem;
  font-weight: 300;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.ultra-player-stats {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: var(--border-ultra-thin) solid var(--border-color);
  margin-bottom: var(--space-lg);
}

.ultra-stat {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

/* 動作按鈕 */
.ultra-actions {
  display: flex;
  gap: var(--space-md);
}

.ultra-action-btn {
  flex: 1;
  padding: var(--space-sm) var(--space-lg);
  background: white;
  border: var(--border-thin) solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--color-text);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-smooth);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  position: relative;
  overflow: hidden;
}

.ultra-action-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--ultra-primary);
  transform: translateY(100%);
  transition: transform var(--duration-normal) var(--ease-smooth);
  z-index: -1;
}

.ultra-action-btn:hover {
  color: white;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.ultra-action-btn:hover::before {
  transform: translateY(0);
}

.ultra-action-btn.primary {
  background: var(--ultra-primary);
  border: none;
  color: white;
}

/* ========== 側邊欄 ========== */
.ultra-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.ultra-sidebar-section {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  border: var(--border-ultra-thin) solid var(--border-color);
  box-shadow: var(--shadow-soft);
}

.ultra-sidebar-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: var(--border-ultra-thin) solid var(--border-color);
  position: relative;
}

.ultra-sidebar-title::after {
  content: '';
  position: absolute;
  bottom: -0.5px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--ultra-primary);
  border-radius: var(--radius-full);
}

/* 相關影片 */
.ultra-related-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.ultra-related-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--duration-normal) var(--ease-smooth);
  position: relative;
}

.ultra-related-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-hover);
  border-radius: var(--radius-lg);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-smooth);
  z-index: -1;
}

.ultra-related-item:hover::before {
  opacity: 1;
}

.ultra-related-item:hover {
  transform: translateX(4px);
}

.ultra-related-thumb {
  width: 120px;
  height: 68px;
  border-radius: var(--radius-md);
  overflow: hidden;
  flex-shrink: 0;
  position: relative;
}

.ultra-related-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-smooth);
}

.ultra-related-item:hover .ultra-related-thumb img {
  transform: scale(1.05);
}

.ultra-related-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.ultra-related-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 4px;
}

.ultra-related-meta {
  font-size: 0.75rem;
  color: var(--color-text-lighter);
}

/* ========== 載入動畫 ========== */
.ultra-loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-full);
  border-top-color: var(--color-primary);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ========== 頁腳 ========== */
.ultra-footer {
  margin-top: var(--space-2xl);
  padding: var(--space-2xl) 0;
  background: linear-gradient(180deg, transparent 0%, rgba(249, 250, 251, 0.8) 100%);
  border-top: var(--border-ultra-thin) solid var(--border-color);
}

.ultra-footer-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  text-align: center;
}

.ultra-footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.ultra-footer-link {
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 400;
  transition: all var(--duration-normal) var(--ease-smooth);
  position: relative;
}

.ultra-footer-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--ultra-primary);
  transition: width var(--duration-normal) var(--ease-smooth);
}

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

.ultra-footer-link:hover::after {
  width: 100%;
}

.ultra-footer-copy {
  font-size: 0.875rem;
  color: var(--color-text-lighter);
  font-weight: 300;
}

/* ========== 響應式設計 ========== */
@media (max-width: 1024px) {
  .ultra-player-layout {
    grid-template-columns: 1fr;
  }
  
  .ultra-sidebar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    font-size: 15px;
  }
  
  .ultra-hero-title {
    font-size: 2rem;
  }
  
  .ultra-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
  }
  
  .ultra-nav-menu {
    display: none;
  }
  
  .ultra-search {
    margin: 0 var(--space-md);
  }
}

@media (max-width: 480px) {
  .ultra-grid {
    grid-template-columns: 1fr;
  }
  
  .ultra-search {
    display: none;
  }
  
  .ultra-container {
    padding: var(--space-xl) var(--space-md);
  }
}

/* ========== 特殊效果 ========== */
/* 漸現動畫 */
.fade-in {
  animation: fadeIn var(--duration-slow) var(--ease-smooth) both;
}

@keyframes fadeIn {
  from { 
    opacity: 0;
    transform: translateY(20px);
  }
  to { 
    opacity: 1;
    transform: translateY(0);
  }
}

/* 脈動效果 */
.pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.9;
  }
}

/* 滾動視差 */
.parallax {
  transform: translateZ(0);
  will-change: transform;
}

/* 確保無遮罩 */
body > *:not(.ultra-nav):not(.ultra-main):not(.ultra-footer) {
  display: none !important;
}