:root {
  --bg: #fffaf6;
  --panel: #ffffff;
  --ink: #252433;
  --muted: #6d6a7c;
  --line: #ebe5dc;
  --accent: #f27154;
  --accent-2: #6f63ff;
  --soft: #fff0e8;
  --green: #247d62;
  --shadow: 0 16px 40px rgba(69, 50, 42, .10);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #fffaf6 0%, #f7fbff 100%);
  line-height: 1.72;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 250, 246, .95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.topbar, .main-nav, .search-box, main, .site-footer {
  width: min(1180px, calc(100% - 32px));
  margin-inline: auto;
}
.topbar {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  padding: 14px 0 10px;
}
.brand-logo, .footer-logo { display: inline-flex; align-items: center; }
.domain-pill {
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  font-size: 14px;
}
.domain-pill strong { color: var(--ink); }
.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 6px 0 12px;
}
.main-nav a {
  padding: 8px 12px;
  border-radius: 999px;
  color: #3a3748;
  background: #fff;
  border: 1px solid transparent;
}
.main-nav a:hover, .main-nav a:focus {
  border-color: rgba(242,113,84,.35);
  color: var(--accent);
}
.search-box {
  display: flex;
  gap: 10px;
  padding-bottom: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.search-box input {
  flex: 1 1 340px;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px 14px;
  font-size: 15px;
  outline: none;
  background: #fff;
}
.search-box input:focus { border-color: var(--accent); }
button, .btn {
  border: 0;
  cursor: pointer;
  border-radius: 14px;
  padding: 11px 16px;
  background: var(--ink);
  color: #fff;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
button:hover, .btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn.ghost, button.ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}
.search-notice {
  flex-basis: 100%;
  margin: 0;
  color: var(--green);
  font-size: 14px;
}
.hero {
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  gap: 28px;
  padding: 34px 0 24px;
  align-items: center;
}
.hero-card, .panel, .module-card, .video-card, .author-card, .comment-card, .faq-card, .article-card {
  background: rgba(255,255,255,.92);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}
.hero-card { padding: 34px; }
.eyebrow {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  color: var(--accent);
  font-weight: 800;
  background: var(--soft);
  border-radius: 999px;
  padding: 7px 12px;
  margin: 0 0 16px;
}
h1, h2, h3 { line-height: 1.26; margin: 0 0 12px; }
h1 { font-size: clamp(30px, 5vw, 54px); letter-spacing: -.04em; }
h2 { font-size: clamp(24px, 3vw, 34px); letter-spacing: -.02em; }
h3 { font-size: 20px; }
.lead { color: var(--muted); font-size: 18px; margin: 0 0 18px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 20px 0; }
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 24px;
}
.stat {
  padding: 14px;
  border-radius: 20px;
  background: #fff7f2;
}
.stat strong { font-size: 22px; display: block; }
.hero-media { overflow: hidden; }
.hero-media figure { margin: 0; }
.hero-media figcaption, .image-note {
  padding: 12px 18px 18px;
  font-size: 13px;
  color: var(--muted);
}
.section {
  padding: 28px 0;
}
.section-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 18px;
}
.section-head p { max-width: 700px; color: var(--muted); margin: 0; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.module-card, .article-card, .author-card, .comment-card, .faq-card, .panel { padding: 22px; }
.module-card ul, .article-card ul { margin: 12px 0 0; padding-left: 18px; color: var(--muted); }
.badge, .tag {
  display: inline-flex;
  border-radius: 999px;
  padding: 5px 10px;
  background: #f2f0ff;
  color: #5147cf;
  font-size: 13px;
  font-weight: 700;
  margin: 0 6px 6px 0;
}
.badge.hot { background: #fff0e8; color: #b0442b; }
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.video-card { overflow: hidden; position: relative; }
.video-thumb {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #eee;
}
.video-thumb img, .video-thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.play-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(20, 19, 31, .18);
  opacity: 0;
  transition: opacity .2s ease;
}
.video-card:hover .play-overlay, .video-card:focus-within .play-overlay { opacity: 1; }
.play-overlay span {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(255,255,255,.9);
  color: var(--accent);
  font-size: 30px;
  padding-left: 4px;
}
.video-body { padding: 18px; }
.meta, .card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  color: var(--muted);
  font-size: 13px;
}
.interactions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.interactions button {
  padding: 8px 10px;
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
  font-size: 13px;
}
.timeline {
  display: grid;
  gap: 14px;
}
.timeline-item {
  border-left: 4px solid var(--accent);
  background: #fff;
  border-radius: 18px;
  padding: 16px;
  box-shadow: 0 8px 22px rgba(69,50,42,.08);
}
.author-card { display: flex; gap: 16px; align-items: flex-start; }
.avatar {
  flex: 0 0 54px;
  width: 54px;
  height: 54px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 22px;
}
.faq-card details { margin-top: 12px; }
.faq-card summary { cursor: pointer; font-weight: 800; }
.notice {
  border: 1px dashed rgba(242,113,84,.6);
  background: #fff7f2;
  padding: 16px 18px;
  border-radius: 20px;
  color: #6a3b2c;
}
.breadcrumb {
  padding: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.breadcrumb a { color: var(--accent); }
.page-hero { padding: 28px 0; }
.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 22px;
  align-items: start;
}
.sidebar {
  display: grid;
  gap: 16px;
  position: sticky;
  top: 184px;
}
.check-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.check-list li {
  padding: 10px 0 10px 28px;
  position: relative;
  border-bottom: 1px solid var(--line);
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 900;
}
.site-footer {
  margin-top: 40px;
  padding: 32px 0 24px;
  border-top: 1px solid var(--line);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr .8fr 1fr;
  gap: 24px;
}
.site-footer a { display: block; color: var(--muted); margin: 7px 0; }
.site-footer h2 { font-size: 18px; }
.copyright {
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  border: 0;
}
@media (max-width: 920px) {
  .hero, .content-layout, .footer-grid { grid-template-columns: 1fr; }
  .grid-3, .video-grid { grid-template-columns: repeat(2, 1fr); }
  .sidebar { position: static; }
}
@media (max-width: 620px) {
  .topbar { align-items: flex-start; flex-direction: column; }
  .grid-3, .grid-2, .video-grid, .stat-row { grid-template-columns: 1fr; }
  .hero-card { padding: 24px; }
  .search-box button { width: 100%; justify-content: center; }
}