/* ====== 全局重置 & 变量 ====== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-card: #212121;
  --bg-card-hover: #2a2a2a;
  --text-primary: #f1f1f1;
  --text-secondary: #aaaaaa;
  --text-muted: #717171;
  --accent: #3ea6ff;
  --accent-hover: #65b8ff;
  --border: #303030;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.2s ease;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-hover);
}

img {
  max-width: 100%;
  display: block;
}

/* ====== 布局 ====== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ====== 头部 ====== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 15, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.header .container {
  display: flex;
  align-items: center;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 700;
  white-space: nowrap;
}

.logo svg {
  color: var(--accent);
}

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

.search-bar {
  flex: 1;
  max-width: 600px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 8px 16px;
  transition: border-color var(--transition);
}

.search-bar:focus-within {
  border-color: var(--accent);
}

.search-bar svg {
  color: var(--text-muted);
  flex-shrink: 0;
}

.search-bar input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font);
}

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

.back-link {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-left: auto;
  white-space: nowrap;
}

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

/* ====== 主内容区 ====== */
.main {
  flex: 1;
  padding: 32px 0;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-primary);
}

/* ====== 视频网格 ====== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.video-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  background: var(--bg-card-hover);
}

.video-card .thumbnail {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 */
  background: var(--bg-secondary);
  overflow: hidden;
}

.video-card .thumbnail img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-card .thumbnail .duration-badge {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: 4px;
}

.video-card .thumbnail .play-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0);
  transition: background var(--transition);
}

.video-card:hover .play-overlay {
  background: rgba(0, 0, 0, 0.3);
}

.video-card .play-overlay svg {
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--transition);
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.5));
}

.video-card:hover .play-overlay svg {
  opacity: 1;
  transform: scale(1);
}

.video-card .card-body {
  padding: 12px 16px 16px;
}

.video-card .card-title {
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 6px;
}

.video-card .card-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ====== 加载状态 ====== */
.loading {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 60px 0;
  color: var(--text-muted);
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 80px 0;
  color: var(--text-muted);
  font-size: 1rem;
}

/* ====== 播放器页面 ====== */
.player-page .main {
  padding-top: 0;
}

.player-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 0 0 var(--radius) var(--radius);
  overflow: hidden;
}

.player-container .video-js {
  width: 100%;
  height: 100%;
}

/* video.js 暗色主题覆盖 */
.video-js .vjs-control-bar {
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
}

.video-js .vjs-big-play-button {
  background: rgba(62, 166, 255, 0.9);
  border: none;
  border-radius: 50%;
  width: 64px;
  height: 64px;
  line-height: 64px;
  font-size: 2rem;
  transition: transform 0.2s ease;
}

.video-js .vjs-big-play-button:hover {
  background: rgba(62, 166, 255, 1);
  transform: scale(1.1);
}

.video-js .vjs-play-progress,
.video-js .vjs-volume-level {
  background: var(--accent);
}

.video-info {
  padding: 24px 0;
}

.video-title {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.3;
}

.video-meta {
  display: flex;
  gap: 20px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ====== 调试面板 ====== */
.debug-panel {
  margin-top: 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
}

.debug-panel summary {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.debug-panel pre {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 300px;
  overflow-y: auto;
}

/* ====== 底部 ====== */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ====== 响应式 ====== */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .header .container {
    flex-wrap: wrap;
  }

  .search-bar {
    order: 3;
    max-width: 100%;
    flex-basis: 100%;
  }

  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
  }

  .player-container {
    border-radius: 0;
  }

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

@media (max-width: 480px) {
  .video-grid {
    grid-template-columns: 1fr;
  }
}