:root {
    --bg: #fffaf3;
    --surface: #ffffff;
    --ink: #1f2937;
    --muted: #64748b;
    --brand: #f97316;
    --brand-dark: #c2410c;
    --line: #fed7aa;
    --soft: #ffedd5;
    --shadow: 0 20px 60px rgba(124, 45, 18, 0.12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--ink);
    line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255, 250, 243, 0.96); backdrop-filter: blur(16px); border-bottom: 1px solid var(--line); }
.topbar { display: flex; justify-content: center; gap: 8px; padding: 8px 16px; font-size: 14px; background: var(--soft); color: var(--brand-dark); }
.main-nav { max-width: 1180px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 14px 20px; }
.brand-logo, .footer-logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 22px; color: var(--brand-dark); }
.brand-logo img, .footer-logo img { width: 42px; height: 42px; }
.nav-links { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.nav-links a { padding: 8px 10px; border-radius: 999px; font-size: 14px; color: #7c2d12; }
.nav-links a:hover, .nav-links a[aria-current="page"] { background: var(--soft); color: var(--brand-dark); }
.nav-toggle { display: none; border: 1px solid var(--line); background: var(--surface); border-radius: 10px; padding: 8px 12px; }
.search-strip { border-top: 1px solid rgba(254, 215, 170, 0.6); }
.search-strip form { max-width: 1180px; margin: 0 auto; padding: 12px 20px 16px; }
.search-strip label { display: block; font-weight: 700; margin-bottom: 8px; color: #7c2d12; }
.search-row { display: flex; gap: 10px; }
.search-row input { flex: 1; border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; font-size: 15px; background: #fff; }
.search-row button, .btn { border: none; border-radius: 14px; padding: 12px 18px; font-weight: 800; cursor: pointer; }
.search-row button, .btn.primary { background: linear-gradient(135deg, var(--brand), #fb923c); color: white; box-shadow: var(--shadow); }
.btn.ghost { background: var(--surface); color: var(--brand-dark); border: 1px solid var(--line); }
.search-note { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.hero, .page-hero { max-width: 1180px; margin: 0 auto; padding: 64px 20px; }
.hero { min-height: 520px; display: grid; align-items: center; }
.hero-content, .page-hero { background: radial-gradient(circle at top right, #ffedd5, #fff 48%, #fff7ed); border: 1px solid var(--line); border-radius: 32px; padding: 44px; box-shadow: var(--shadow); }
.breadcrumb, .eyebrow, .section-kicker { color: var(--brand-dark); font-weight: 800; letter-spacing: 0.02em; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; color: #431407; }
h1 { font-size: clamp(34px, 6vw, 64px); margin: 12px 0; }
h2 { font-size: clamp(26px, 4vw, 42px); margin: 10px 0 14px; }
h3 { font-size: 20px; margin: 10px 0; }
h4 { font-size: 18px; margin: 14px 0 8px; }
h5, h6 { font-size: 16px; margin: 12px 0 8px; }
.hero-lead, .section-intro, .page-hero p { font-size: 18px; color: #4b5563; max-width: 820px; }
.hero-actions, .contact-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.hero-stats { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 28px; }
.hero-stats span { background: white; border: 1px solid var(--line); border-radius: 18px; padding: 12px 16px; color: var(--muted); }
.hero-stats strong { display: block; color: var(--brand-dark); font-size: 20px; }
.section { max-width: 1180px; margin: 0 auto; padding: 64px 20px; }
.tinted { max-width: none; background: linear-gradient(180deg, rgba(255,237,213,0.75), rgba(255,250,243,0.4)); }
.tinted > * { max-width: 1180px; margin-left: auto; margin-right: auto; }
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 28px; }
.card, .panel, .update-list article, details, .video-card { background: var(--surface); border: 1px solid var(--line); border-radius: 24px; padding: 22px; box-shadow: 0 14px 35px rgba(124, 45, 18, 0.08); }
.card:hover, .video-card:hover { transform: translateY(-3px); transition: transform 0.2s ease; }
.tag, .tag-list span { display: inline-flex; align-items: center; border-radius: 999px; background: var(--soft); color: var(--brand-dark); font-size: 13px; font-weight: 800; padding: 6px 10px; }
.muted { color: var(--muted); }
.video-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-top: 30px; }
.video-grid.compact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.video-card { padding: 0; overflow: hidden; }
.video-card figure { margin: 0; }
.video-thumb { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: var(--soft); }
.video-thumb img { width: 100%; height: 100%; object-fit: cover; transform: scale(1.01); transition: transform 0.25s ease, filter 0.25s ease; }
.video-card:hover img, .video-card.is-hover img { transform: scale(1.06); filter: saturate(1.05) brightness(0.92); }
.play-button { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%) scale(0.9); width: 64px; height: 64px; border-radius: 999px; border: 2px solid rgba(255,255,255,0.9); background: rgba(249, 115, 22, 0.92); color: white; font-size: 24px; opacity: 0; transition: opacity 0.2s ease, transform 0.2s ease; cursor: pointer; }
.video-card:hover .play-button, .video-card.is-hover .play-button { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.image-description { padding: 8px 14px 0; color: var(--muted); font-size: 13px; }
.video-body { padding: 18px; }
.tag-list { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0; }
.metrics { display: flex; gap: 8px; flex-wrap: wrap; margin: 0; padding: 0; list-style: none; color: #7c2d12; font-weight: 700; font-size: 13px; }
.metrics li { background: #fff7ed; border: 1px solid var(--line); border-radius: 999px; padding: 5px 8px; }
.split, .help-layout { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 28px; }
.timeline { list-style: none; margin: 28px 0 0; padding: 0; display: grid; gap: 16px; }
.timeline li { background: white; border: 1px solid var(--line); border-radius: 22px; padding: 20px; display: grid; grid-template-columns: 96px 1fr; gap: 12px; align-items: start; }
.timeline span { color: var(--brand-dark); font-weight: 900; }
.update-list { display: grid; gap: 16px; margin-top: 28px; }
.faq-list { display: grid; gap: 12px; margin-top: 28px; }
details summary { cursor: pointer; font-weight: 800; color: #431407; }
details p { color: var(--muted); }
.contact-band { background: linear-gradient(135deg, #431407, #9a3412); color: white; border-radius: 32px; margin-bottom: 64px; }
.contact-band h2, .contact-band h3, .contact-band h4, .contact-band .section-kicker, .contact-band p { color: white; }
.contact-form { display: grid; gap: 14px; max-width: 720px; margin-top: 24px; }
.contact-form label { display: grid; gap: 8px; font-weight: 800; }
.contact-form input, .contact-form textarea { border: 1px solid rgba(255,255,255,0.4); border-radius: 14px; padding: 12px; font: inherit; }
.contact-form textarea { min-height: 140px; }
.site-footer { background: #431407; color: #ffedd5; padding: 44px 20px 20px; }
.footer-grid { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 24px; }
.site-footer h6, .site-footer .footer-logo { color: white; }
.copyright { max-width: 1180px; margin: 24px auto 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.18); color: #fed7aa; }
@media (max-width: 900px) {
    .nav-toggle { display: inline-block; }
    .nav-links { display: none; width: 100%; flex-direction: column; align-items: stretch; }
    .nav-links.is-open { display: flex; }
    .main-nav { flex-wrap: wrap; }
    .search-row, .hero-actions, .contact-actions { flex-direction: column; }
    .card-grid, .video-grid, .video-grid.compact, .split, .help-layout, .footer-grid { grid-template-columns: 1fr; }
    .hero, .page-hero { padding: 32px 16px; }
    .hero-content, .page-hero { padding: 28px; border-radius: 24px; }
    .timeline li { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
    .topbar { align-items: center; text-align: center; flex-wrap: wrap; }
    h1 { font-size: 34px; }
    .section { padding: 44px 16px; }
}