* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f1115;
  --card: #171a21;
  --accent: #c81d25;
  --accent-soft: #e64a53;
  --text: #f2f3f5;
  --muted: #a7b0bd;
  --line: #2a2f3a;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

header {
  background: linear-gradient(160deg, #0f1115 0%, #1b1f29 45%, #24131a 100%);
  border-bottom: 1px solid var(--line);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 1px;
}

.brand-badge {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #ff6b6b);
  display: grid;
  place-items: center;
  font-size: 18px;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
  font-size: 15px;
  color: var(--muted);
}

nav a:hover {
  color: var(--text);
}

.hero {
  padding: 60px 0 50px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: center;
}

.hero h1 {
  font-size: 36px;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero p {
  color: var(--muted);
  margin-bottom: 22px;
}

.hero-actions {
  display: flex;
  gap: 14px;
}

.btn {
  padding: 12px 20px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

.btn.secondary {
  background: transparent;
  border-color: var(--accent-soft);
}

.hero-visual {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
}

main {
  padding: 40px 0 70px;
}

section {
  margin-bottom: 50px;
}

section h2 {
  font-size: 26px;
  margin-bottom: 12px;
}

section h3 {
  font-size: 19px;
  margin: 18px 0 10px;
  color: var(--accent-soft);
}

.lead {
  color: var(--muted);
  margin-bottom: 14px;
}

.grid {
  display: grid;
  gap: 22px;
}

.grid.cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card-body {
  padding: 16px;
}

.card-body h4 {
  margin-bottom: 8px;
  font-size: 18px;
}

.meta {
  color: var(--muted);
  font-size: 13px;
}

.badge-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.badge {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--muted);
}

.split {
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr 1fr;
}

.list {
  display: grid;
  gap: 16px;
}

.list-item {
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #141720;
}

footer {
  border-top: 1px solid var(--line);
  padding: 30px 0 40px;
  color: var(--muted);
}

.footer-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: 2fr 1fr 1fr;
}

.video-wall {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.video-card {
  border-radius: 18px;
  overflow: hidden;
  background: #f8fafc;
  color: #1f2937;
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.12);
  border: 1px solid #e2e8f0;
}

.video-thumb {
  position: relative;
  padding: 22px 22px 0;
}

.video-thumb img {
  width: 100%;
  border-radius: 14px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.play-btn {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  display: grid;
  place-items: center;
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.2);
}

.play-btn::before {
  content: "";
  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 16px solid #3b82f6;
  margin-left: 4px;
}

.duration {
  position: absolute;
  right: 34px;
  bottom: 12px;
  background: rgba(17, 24, 39, 0.8);
  color: #f9fafb;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 13px;
}

.video-info {
  padding: 18px 22px 22px;
}

.video-info h4 {
  font-size: 18px;
  margin-bottom: 8px;
}

.video-desc {
  color: #64748b;
  font-size: 14px;
  margin-bottom: 14px;
}

.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid #e2e8f0;
  color: #64748b;
  font-size: 13px;
}

.author {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #111827;
  position: relative;
}

.avatar::after {
  content: "";
  position: absolute;
  inset: 8px 10px auto;
  width: 14px;
  height: 14px;
  background: #f8fafc;
  border-radius: 50%;
  top: 7px;
  left: 10px;
  box-shadow: 0 12px 0 2px #f8fafc;
}

.stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.tag-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.tag {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid #e2e8f0;
  font-size: 12px;
  color: #64748b;
  background: #fff;
}

.stat {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.stat-card {
  background: #141821;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}

.stat-card strong {
  display: block;
  font-size: 20px;
  margin-bottom: 6px;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .grid.cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .video-wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  nav ul {
    flex-wrap: wrap;
    gap: 12px;
  }
}

@media (max-width: 640px) {
  .grid.cards {
    grid-template-columns: 1fr;
  }

  .video-wall {
    grid-template-columns: 1fr;
  }

  .stat {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 28px;
  }
}