/* ============================================
   博鱼体育 - 主样式文件 (多页面版)
   Design: Sport Arena - 红色主色调体育平台
   ============================================ */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 14px; }
body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: #f5f5f5;
  color: #333;
  min-height: 100vh;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { border: none; background: none; cursor: pointer; font-family: inherit; font-size: inherit; }
input { font-family: inherit; font-size: inherit; outline: none; }

:root {
  --red: #e53935;
  --red-dark: #c62828;
  --red-light: #ff5252;
  --dark: #1a1a2e;
  --dark2: #16213e;
  --gray-bg: #f5f5f5;
  --gray-100: #fafafa;
  --gray-200: #f0f0f0;
  --gray-300: #e0e0e0;
  --gray-400: #bdbdbd;
  --gray-500: #9e9e9e;
  --gray-600: #757575;
  --gray-700: #616161;
  --white: #ffffff;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --radius: 8px;
  --sidebar-w: 70px;
  --header-h: 60px;
  --transition: all 0.3s ease;
}

/* === Header === */
.header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-h); background: var(--white);
  display: flex; align-items: center; padding: 0 24px;
  z-index: 1000; box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
.header-logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 20px; font-weight: 900; color: var(--red);
  margin-right: 30px; flex-shrink: 0;
}
.header-logo .logo-icon {
  width: 36px; height: 36px; background: var(--red); color: var(--white);
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 900;
}
.header-logo span:last-child { color: var(--dark); }
.header-search { flex: 1; max-width: 500px; position: relative; }
.header-search input {
  width: 100%; height: 38px; border: 1px solid var(--gray-300);
  border-radius: 20px; padding: 0 16px 0 40px; font-size: 13px;
  background: var(--gray-100); transition: var(--transition);
}
.header-search input:focus { border-color: var(--red); background: var(--white); }
.header-search .search-icon {
  position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  color: var(--gray-500); font-size: 16px;
}
.header-right { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.btn-app {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 20px; background: var(--red); color: var(--white);
  border-radius: 20px; font-size: 13px; font-weight: 600; transition: var(--transition);
}
.btn-app:hover { background: var(--red-dark); }
.btn-login {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 16px; color: var(--gray-700); font-size: 13px; transition: var(--transition);
}
.btn-login:hover { color: var(--red); }

/* === Sidebar === */
.sidebar {
  position: fixed; top: var(--header-h); left: 0; width: var(--sidebar-w);
  height: calc(100vh - var(--header-h)); background: var(--white);
  display: flex; flex-direction: column; align-items: center;
  padding: 12px 0; z-index: 999; border-right: 1px solid var(--gray-200);
}
.sidebar-item {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  width: 56px; height: 56px; border-radius: 12px; color: var(--gray-600);
  font-size: 11px; gap: 4px; transition: var(--transition); margin-bottom: 4px;
}
.sidebar-item .icon { font-size: 20px; }
.sidebar-item:hover, .sidebar-item.active { background: var(--red); color: var(--white); }
.sidebar-ball {
  margin-top: auto; width: 40px; height: 40px; background: var(--red);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 20px; margin-bottom: 16px; animation: bounce 2s infinite;
}
@keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }

/* === Main Content === */
.main-content { margin-left: var(--sidebar-w); margin-top: var(--header-h); min-height: calc(100vh - var(--header-h)); }

/* === Banner === */
.banner { position: relative; width: 100%; height: 420px; overflow: hidden; }
.banner-slides { display: flex; width: 300%; height: 100%; transition: transform 0.6s ease; }
.banner-slide { width: 33.333%; height: 100%; position: relative; flex-shrink: 0; }
.banner-slide img { width: 100%; height: 100%; object-fit: cover; }
.banner-overlay {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 60px 40px 40px; background: linear-gradient(transparent, rgba(0,0,0,0.75)); color: var(--white);
}
.banner-tag {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--red); color: var(--white); padding: 5px 14px;
  border-radius: 20px; font-size: 12px; font-weight: 600; margin-bottom: 12px;
}
.banner-title { font-size: 28px; font-weight: 900; margin-bottom: 6px; }
.banner-desc { font-size: 15px; opacity: 0.85; }
.banner-dots { position: absolute; bottom: 20px; right: 30px; display: flex; gap: 8px; }
.banner-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255,255,255,0.4); cursor: pointer; transition: var(--transition);
}
.banner-dot.active { width: 28px; border-radius: 5px; background: var(--red); }

/* === Section === */
.section { padding: 24px 28px; }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.section-title { display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 800; }
.section-title .dot { width: 8px; height: 8px; background: var(--red); border-radius: 50%; animation: pulse 1.5s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }
.section-subtitle { color: var(--gray-500); font-size: 13px; margin-left: 10px; }
.section-more { color: var(--red); font-size: 13px; font-weight: 600; display: flex; align-items: center; gap: 4px; transition: var(--transition); }
.section-more:hover { gap: 8px; }

/* === Match Cards === */
.matches-scroll { position: relative; }
.matches-container { display: flex; gap: 14px; overflow-x: auto; padding-bottom: 8px; scrollbar-width: none; }
.matches-container::-webkit-scrollbar { display: none; }
.match-card {
  flex-shrink: 0; width: 220px; background: var(--white); border-radius: var(--radius);
  padding: 14px; box-shadow: var(--shadow); transition: var(--transition); cursor: pointer;
  border: 1px solid var(--gray-200);
}
.match-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--red); }
.match-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; font-size: 12px; }
.match-league { color: var(--gray-600); font-weight: 600; }
.match-status-live { color: var(--red); font-weight: 700; font-size: 11px; display: flex; align-items: center; gap: 4px; }
.match-status-live::before { content: ''; width: 6px; height: 6px; background: var(--red); border-radius: 50%; animation: pulse 1.5s infinite; }
.match-status-time { color: var(--gray-500); font-size: 12px; }
.match-teams { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.match-team { font-size: 14px; font-weight: 700; text-align: center; flex: 1; }
.match-score { font-size: 22px; font-weight: 900; color: var(--red); text-align: center; min-width: 70px; }
.match-vs { font-size: 13px; color: var(--gray-500); font-weight: 600; }
.match-action { display: flex; align-items: center; justify-content: center; gap: 4px; margin-top: 10px; color: var(--red); font-size: 12px; font-weight: 600; }
.match-waiting { text-align: center; margin-top: 10px; color: var(--gray-500); font-size: 12px; }
.scroll-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 32px; height: 32px; background: var(--white); border-radius: 50%;
  box-shadow: var(--shadow); display: flex; align-items: center; justify-content: center;
  z-index: 10; font-size: 16px; color: var(--gray-600); transition: var(--transition);
}
.scroll-btn:hover { background: var(--red); color: var(--white); }
.scroll-btn.left { left: -10px; }
.scroll-btn.right { right: -10px; }

/* === Video Grid === */
.video-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.video-card { background: var(--white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); cursor: pointer; display: block; }
.video-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.video-thumb { position: relative; width: 100%; height: 160px; overflow: hidden; }
.video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-badge { position: absolute; top: 8px; left: 8px; padding: 3px 10px; border-radius: 4px; font-size: 11px; font-weight: 700; color: var(--white); background: var(--red); }
.video-views { position: absolute; bottom: 8px; right: 8px; display: flex; align-items: center; gap: 4px; background: rgba(0,0,0,0.6); color: var(--white); padding: 2px 8px; border-radius: 4px; font-size: 11px; }
.video-play-icon {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 44px; height: 44px; background: rgba(229,57,53,0.85); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--white); font-size: 18px; opacity: 0; transition: var(--transition);
}
.video-card:hover .video-play-icon { opacity: 1; }
.video-info { padding: 12px; }
.video-title { font-size: 13px; font-weight: 700; margin-bottom: 6px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-meta { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--gray-500); }
.video-score { color: var(--red); font-weight: 700; }

/* === News === */
.news-list { display: flex; flex-direction: column; gap: 16px; }
.news-item { display: flex; gap: 16px; background: var(--white); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); transition: var(--transition); cursor: pointer; }
.news-item:hover { transform: translateX(4px); box-shadow: var(--shadow-lg); }
.news-thumb { width: 200px; height: 130px; border-radius: 6px; overflow: hidden; flex-shrink: 0; }
.news-thumb img { width: 100%; height: 100%; object-fit: cover; }
.news-content { flex: 1; }
.news-title { font-size: 16px; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
.news-summary { font-size: 13px; color: var(--gray-600); line-height: 1.6; margin-bottom: 10px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-footer { display: flex; justify-content: space-between; align-items: center; }
.news-date { font-size: 12px; color: var(--gray-500); }
.news-read { color: var(--red); font-size: 12px; font-weight: 600; }

/* === Schedule === */
.page-section { padding: 24px 28px; }
.page-title { font-size: 20px; font-weight: 800; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
.tabs { display: flex; gap: 4px; margin-bottom: 16px; }
.tab { padding: 8px 20px; border-radius: 20px; font-size: 13px; font-weight: 600; color: var(--gray-600); background: var(--gray-200); transition: var(--transition); }
.tab:hover { background: var(--gray-300); }
.tab.active { background: var(--red); color: var(--white); }
.league-tabs { display: flex; gap: 8px; margin-bottom: 16px; overflow-x: auto; padding-bottom: 4px; scrollbar-width: none; }
.league-tabs::-webkit-scrollbar { display: none; }
.league-tab { display: flex; align-items: center; gap: 4px; padding: 6px 14px; border-radius: 16px; font-size: 12px; font-weight: 600; color: var(--gray-600); background: var(--gray-100); border: 1px solid var(--gray-300); white-space: nowrap; transition: var(--transition); }
.league-tab:hover { border-color: var(--red); color: var(--red); }
.league-tab.active { background: var(--red); color: var(--white); border-color: var(--red); }
.date-tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.date-tab { display: flex; flex-direction: column; align-items: center; padding: 8px 16px; border-radius: 8px; font-size: 13px; font-weight: 600; color: var(--gray-600); background: var(--gray-100); transition: var(--transition); }
.date-tab:hover { background: var(--gray-200); }
.date-tab.active { background: var(--red); color: var(--white); }
.date-tab small { font-size: 11px; font-weight: 400; margin-top: 2px; }
.schedule-group-title { font-size: 14px; font-weight: 700; color: var(--red); margin-bottom: 12px; margin-top: 20px; display: flex; align-items: center; gap: 8px; }
.schedule-group-title:first-of-type { margin-top: 0; }
.schedule-group-title .count { color: var(--gray-500); font-weight: 400; font-size: 13px; }
.schedule-match { display: flex; align-items: center; background: var(--white); border-radius: var(--radius); padding: 16px 20px; margin-bottom: 10px; box-shadow: var(--shadow); transition: var(--transition); }
.schedule-match:hover { box-shadow: var(--shadow-lg); }
.schedule-league { width: 80px; text-align: center; flex-shrink: 0; }
.schedule-league-flag { font-size: 24px; margin-bottom: 2px; }
.schedule-league-name { font-size: 11px; color: var(--gray-600); }
.schedule-league-time { font-size: 11px; color: var(--gray-500); }
.schedule-status { width: 60px; text-align: center; flex-shrink: 0; }
.status-badge { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 600; }
.status-badge.live { background: rgba(229,57,53,0.1); color: var(--red); }
.status-badge.upcoming { background: var(--gray-100); color: var(--gray-500); }
.status-badge.finished { background: var(--gray-100); color: var(--gray-600); }
.schedule-teams { flex: 1; display: flex; align-items: center; justify-content: center; gap: 20px; }
.schedule-team { font-size: 15px; font-weight: 700; min-width: 100px; }
.schedule-team.home { text-align: right; }
.schedule-team.away { text-align: left; }
.schedule-score-center { font-size: 22px; font-weight: 900; color: var(--red); min-width: 80px; text-align: center; }
.schedule-vs-center { font-size: 14px; color: var(--gray-400); font-weight: 700; min-width: 80px; text-align: center; }
.schedule-action { width: 100px; text-align: right; flex-shrink: 0; }
.btn-watch { display: inline-flex; align-items: center; gap: 4px; padding: 6px 16px; background: var(--red); color: var(--white); border-radius: 20px; font-size: 12px; font-weight: 600; transition: var(--transition); }
.btn-watch:hover { background: var(--red-dark); }

/* === Video Player === */
.player-page { padding: 24px 28px; }
.player-back { display: inline-flex; align-items: center; gap: 6px; color: var(--gray-600); font-size: 13px; margin-bottom: 16px; transition: var(--transition); }
.player-back:hover { color: var(--red); }
.player-layout { display: grid; grid-template-columns: 1fr 320px; gap: 24px; }
.player-video { width: 100%; border-radius: var(--radius); overflow: hidden; background: #000; aspect-ratio: 16/9; }
.player-video video { width: 100%; height: 100%; object-fit: contain; }
.player-info { padding: 16px 0; }
.player-title { font-size: 20px; font-weight: 800; margin-bottom: 10px; }
.player-meta { display: flex; align-items: center; gap: 16px; font-size: 13px; color: var(--gray-500); margin-bottom: 16px; }
.player-meta .league-badge { background: var(--red); color: var(--white); padding: 2px 10px; border-radius: 4px; font-size: 12px; font-weight: 600; }
.player-actions { display: flex; gap: 20px; padding: 12px 0; border-top: 1px solid var(--gray-200); border-bottom: 1px solid var(--gray-200); }
.player-action-btn { display: flex; align-items: center; gap: 6px; color: var(--gray-600); font-size: 13px; transition: var(--transition); }
.player-action-btn:hover { color: var(--red); }
.match-info-box { background: var(--white); border-radius: var(--radius); padding: 20px; margin-top: 16px; box-shadow: var(--shadow); }
.match-info-box h3 { font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.match-info-teams { display: flex; align-items: center; justify-content: center; gap: 30px; }
.match-info-team { text-align: center; }
.match-info-team .team-icon { width: 48px; height: 48px; background: var(--gray-200); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 24px; margin: 0 auto 6px; }
.match-info-team .team-name { font-size: 14px; font-weight: 700; }
.match-info-score { text-align: center; }
.match-info-score .score { font-size: 28px; font-weight: 900; color: var(--red); }
.match-info-score .league { font-size: 12px; color: var(--gray-500); margin-top: 4px; }

/* === Related Videos === */
.related-videos h3 { font-size: 15px; font-weight: 700; margin-bottom: 14px; }
.related-item { display: flex; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--gray-200); cursor: pointer; transition: var(--transition); }
.related-item:hover { background: var(--gray-100); margin: 0 -8px; padding: 10px 8px; border-radius: 6px; }
.related-thumb { width: 120px; height: 70px; border-radius: 6px; overflow: hidden; flex-shrink: 0; position: relative; }
.related-thumb img { width: 100%; height: 100%; object-fit: cover; }
.related-thumb .badge { position: absolute; top: 4px; left: 4px; padding: 1px 6px; border-radius: 3px; font-size: 10px; font-weight: 700; color: var(--white); background: var(--red); }
.related-info { flex: 1; }
.related-title { font-size: 12px; font-weight: 600; line-height: 1.4; margin-bottom: 4px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.related-score { font-size: 12px; color: var(--red); font-weight: 700; }
.related-meta { font-size: 11px; color: var(--gray-500); margin-top: 2px; }

/* === Activity === */
.activity-banner { text-align: center; padding: 40px 0 30px; background: linear-gradient(135deg, var(--red), var(--red-dark)); color: var(--white); border-radius: var(--radius); margin-bottom: 24px; }
.activity-banner h2 { font-size: 24px; font-weight: 900; margin-bottom: 6px; }
.activity-banner p { font-size: 14px; opacity: 0.8; }
.activity-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 30px; }
.activity-card { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.activity-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.activity-card-header { padding: 24px 20px; color: var(--white); }
.activity-card-header.red { background: linear-gradient(135deg, #e53935, #c62828); }
.activity-card-header.orange { background: linear-gradient(135deg, #f59e0b, #ea580c); }
.activity-card-header.green { background: linear-gradient(135deg, #10b981, #15803d); }
.activity-card-header h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; }
.activity-card-header .date { font-size: 12px; opacity: 0.8; }
.activity-card-body { padding: 16px 20px; background: var(--white); }
.activity-card-body p { font-size: 13px; color: var(--gray-600); line-height: 1.6; margin-bottom: 14px; }
.btn-join { display: block; width: 100%; padding: 10px; background: var(--red); color: var(--white); border-radius: 6px; font-size: 14px; font-weight: 700; text-align: center; transition: var(--transition); }
.btn-join:hover { background: var(--red-dark); }
.activity-rules { background: var(--white); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.activity-rules h3 { font-size: 16px; font-weight: 700; margin-bottom: 14px; }
.activity-rules ol { list-style: decimal; padding-left: 20px; }
.activity-rules li { font-size: 13px; color: var(--gray-600); line-height: 2; }

/* === News Page === */
.news-page-layout { display: grid; grid-template-columns: 1fr 320px; gap: 24px; }
.sidebar-card { background: var(--white); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); margin-bottom: 16px; }
.sidebar-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 14px; }
.sidebar-activity { padding: 14px; border-radius: 8px; color: var(--white); margin-bottom: 10px; cursor: pointer; transition: var(--transition); }
.sidebar-activity:hover { transform: translateX(4px); }
.sidebar-activity.red { background: linear-gradient(135deg, #e53935, #c62828); }
.sidebar-activity.orange { background: linear-gradient(135deg, #f59e0b, #ea580c); }
.sidebar-activity.green { background: linear-gradient(135deg, #10b981, #15803d); }
.sidebar-activity h4 { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.sidebar-activity p { font-size: 11px; opacity: 0.85; line-height: 1.4; }
.sidebar-activity .date { font-size: 10px; opacity: 0.7; margin-top: 4px; }
.hot-video-item { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--gray-200); cursor: pointer; }
.hot-video-item:last-child { border-bottom: none; }
.hot-rank { width: 22px; height: 22px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; color: var(--white); flex-shrink: 0; }
.hot-rank.r1 { background: var(--red); }
.hot-rank.r2 { background: #f59e0b; }
.hot-rank.r3 { background: #10b981; }
.hot-video-info { flex: 1; }
.hot-video-title { font-size: 13px; font-weight: 600; }
.hot-video-score { font-size: 12px; color: var(--red); font-weight: 700; }

/* === Playback Grid === */
.playback-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* === App Download === */
.app-download { background: linear-gradient(135deg, var(--dark), var(--dark2)); padding: 40px 28px; display: flex; align-items: center; justify-content: center; gap: 40px; }
.app-download-text { color: var(--white); }
.app-download-text h3 { font-size: 22px; font-weight: 800; margin-bottom: 8px; }
.app-download-text p { font-size: 14px; opacity: 0.7; }
.btn-download { padding: 12px 36px; background: var(--red); color: var(--white); border-radius: 8px; font-size: 15px; font-weight: 700; transition: var(--transition); }
.btn-download:hover { background: var(--red-light); transform: scale(1.05); }

/* === Footer === */
.footer { background: var(--dark); color: rgba(255,255,255,0.6); padding: 30px 28px; }
.footer-content { display: flex; justify-content: space-between; margin-bottom: 20px; }
.footer-brand { max-width: 300px; }
.footer-brand .logo { font-size: 18px; font-weight: 900; color: var(--red); margin-bottom: 8px; }
.footer-brand p { font-size: 12px; line-height: 1.6; }
.footer-links h4, .footer-contact h4 { color: var(--white); font-size: 14px; font-weight: 700; margin-bottom: 10px; }
.footer-links a { display: block; font-size: 12px; margin-bottom: 6px; transition: var(--transition); }
.footer-links a:hover { color: var(--red); }
.footer-contact p { font-size: 12px; margin-bottom: 4px; }
.footer-bottom { text-align: center; padding-top: 16px; border-top: 1px solid rgba(255,255,255,0.1); font-size: 12px; }

/* === Responsive === */
@media (max-width: 1200px) { .video-grid, .playback-grid { grid-template-columns: repeat(3, 1fr); } .activity-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 900px) { .video-grid, .playback-grid { grid-template-columns: repeat(2, 1fr); } .news-page-layout, .player-layout { grid-template-columns: 1fr; } .activity-grid { grid-template-columns: 1fr; } .banner { height: 300px; } }
@media (max-width: 600px) { .sidebar { display: none; } .main-content { margin-left: 0; } .video-grid, .playback-grid { grid-template-columns: 1fr; } .banner { height: 220px; } .banner-title { font-size: 20px; } }