:root {
  --bg: #0a1a2f; /* 深蓝色背景 */
  --surface: #ffffff; /* 白色卡片 */
  --text: #2c3e50; /* 深色正文 */
  --muted: #64748b; /* 浅灰次要文字 */
  --primary: #ff8c00; /* 暖橙美食主色 */
  --accent: #ff6b35; /* 橙红点缀 */
  --border: #e2e8f0; /* 浅灰边框 */
  --radius: 12px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Roboto, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* 导航栏 */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

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

.search-bar input {
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #f8fafc;
  color: #2c3e50;
  outline: none;
  width: 280px;
}

.search-bar input:focus {
  border-color: var(--primary);
}

/* 主容器 */
.container {
  max-width: 1200px;
  margin: auto;
  padding: 2rem;
}

/* 分类筛选 */
.category-filters {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
}

.chip {
  padding: 0.5rem 1rem;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
  transition: 0.2s;
}

.chip.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.chip:hover {
  background: #fff3e6;
}

/* 视频网格 */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.video-card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  transition: 0.2s;
}

.video-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 8px 20px rgba(255,140,0,0.15);
}

.thumbnail-wrapper {
  aspect-ratio: 16/9;
}

.thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-info {
  padding: 1rem;
}

.video-title {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tag-badge {
  font-size: 0.75rem;
  background: #fff3e6;
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 4px;
}

/* 视频播放页 */
.player-wrapper {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 1.5rem;
}

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

.back-link {
  color: var(--muted);
  text-decoration: none;
  margin-bottom: 1rem;
  display: inline-block;
}

.video-details {
  margin-bottom: 2rem;
}