:root {
    --bg: #f6f7fb;
    --card: #ffffff;
    --ink: #1d2733;
    --muted: #657287;
    --brand: #4f8f5f;
    --brand-dark: #24643f;
    --line: #e5eadf;
    --soft: #eef6ef;
    --warning: #fff6df;
    --shadow: 0 18px 45px rgba(39, 78, 55, 0.10);
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; border-radius: 18px; }
.site-header, .site-footer { background: #fff; }
.site-header { position: sticky; top: 0; z-index: 20; box-shadow: 0 8px 30px rgba(0,0,0,0.05); }
.topbar { max-width: 1180px; margin: 0 auto; padding: 18px 18px 12px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand, .footer-logo { display: flex; align-items: center; gap: 12px; }
.brand strong { display: block; font-size: 24px; letter-spacing: 0.04em; }
.brand em { display: block; color: var(--muted); font-style: normal; font-size: 13px; }
.domain-pill { padding: 8px 14px; border: 1px solid var(--line); background: var(--soft); border-radius: 999px; color: var(--brand-dark); font-size: 14px; }
.main-nav { max-width: 1180px; margin: 0 auto; padding: 0 18px 14px; display: flex; gap: 10px; flex-wrap: wrap; }
.main-nav a { padding: 9px 14px; border-radius: 999px; color: var(--muted); background: #f8faf7; border: 1px solid transparent; }
.main-nav a:hover, .main-nav a.is-active { color: var(--brand-dark); border-color: #d6e8d8; background: var(--soft); }
.search-strip { border-top: 1px solid var(--line); padding: 12px 18px 16px; background: linear-gradient(90deg, #fbfdf9, #f0f7f1); }
.search-box { max-width: 760px; margin: 0 auto; display: flex; gap: 10px; }
.search-box input { flex: 1; border: 1px solid #d9e1da; border-radius: 14px; padding: 12px 14px; font-size: 15px; }
.search-box button, .primary-btn, .ghost-btn { border: 0; border-radius: 14px; padding: 12px 18px; background: var(--brand); color: #fff; font-weight: 700; cursor: pointer; }
.ghost-btn { background: #fff; color: var(--brand-dark); border: 1px solid #cce1cd; }
.search-hint { max-width: 760px; margin: 8px auto 0; font-size: 13px; color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
main { max-width: 1180px; margin: 0 auto; padding: 28px 18px 56px; }
.hero { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr); gap: 24px; align-items: stretch; }
.hero-card, .card, .panel { background: var(--card); border: 1px solid var(--line); border-radius: 28px; box-shadow: var(--shadow); }
.hero-card { padding: 34px; position: relative; overflow: hidden; }
.hero-card::after { content: ""; position: absolute; inset: auto -60px -100px auto; width: 260px; height: 260px; background: radial-gradient(circle, rgba(79,143,95,0.23), transparent 70%); }
.eyebrow { color: var(--brand-dark); font-weight: 800; letter-spacing: 0.08em; font-size: 13px; text-transform: uppercase; }
h1 { font-size: clamp(32px, 5vw, 54px); line-height: 1.08; margin: 12px 0 16px; }
h2 { font-size: clamp(24px, 3vw, 34px); margin: 0 0 12px; }
h3 { margin: 0 0 8px; font-size: 20px; }
p { margin: 0 0 12px; color: var(--muted); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.hero-meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 26px; }
.hero-meta span, .stat-pill { padding: 12px; background: #f4faf3; border: 1px solid #dceadd; border-radius: 18px; color: var(--brand-dark); font-weight: 800; text-align: center; }
.hero-side { display: grid; gap: 14px; }
.video-card { position: relative; min-height: 220px; overflow: hidden; border-radius: 28px; background: #111; }
.video-card img, .video-card video { width: 100%; height: 100%; object-fit: cover; min-height: 220px; opacity: 0.92; }
.play-button { position: absolute; inset: 50% auto auto 50%; transform: translate(-50%, -50%) scale(0.85); width: 72px; height: 72px; border-radius: 50%; border: 2px solid rgba(255,255,255,0.88); background: rgba(255,255,255,0.18); color: #fff; display: grid; place-items: center; opacity: 0; transition: all .25s ease; font-weight: 900; font-size: 24px; }
.video-card:hover .play-button, .video-card:focus-within .play-button { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-caption { position: absolute; left: 18px; right: 18px; bottom: 18px; padding: 14px; border-radius: 18px; background: rgba(12, 26, 18, 0.70); color: #fff; backdrop-filter: blur(10px); }
.video-caption p, .video-caption span { color: rgba(255,255,255,0.86); }
.section { margin-top: 34px; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 16px; margin-bottom: 16px; }
.section-head p { max-width: 760px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card { padding: 20px; }
.card img { margin-bottom: 14px; aspect-ratio: 16/10; object-fit: cover; }
.meta-line { display: flex; flex-wrap: wrap; gap: 8px; color: var(--muted); font-size: 13px; margin: 10px 0; }
.meta-line span { background: #f2f6ef; border-radius: 999px; padding: 4px 8px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.tag-list a, .tag-list span { background: #f0f6f0; color: var(--brand-dark); padding: 6px 10px; border-radius: 999px; font-size: 13px; }
.news-list { display: grid; gap: 12px; }
.news-item { display: grid; grid-template-columns: 92px minmax(0, 1fr); gap: 14px; padding: 14px; border: 1px solid var(--line); border-radius: 22px; background: #fff; }
.news-item img { width: 92px; height: 78px; object-fit: cover; }
.topic-banner { padding: 24px; border-radius: 28px; background: linear-gradient(135deg, #eaf7ed, #ffffff 55%, #fff6df); border: 1px solid #dce9d8; }
.author-card { text-align: center; }
.author-avatar { width: 86px; height: 86px; margin: 0 auto 12px; border-radius: 50%; object-fit: cover; }
.faq { display: grid; gap: 12px; }
details { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 16px; }
summary { cursor: pointer; font-weight: 800; color: var(--ink); }
.comment { position: relative; padding-left: 18px; }
.comment::before { content: "“"; position: absolute; left: 0; top: -8px; font-size: 38px; color: #b8d5bd; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 24px; align-items: start; }
.article-body { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 30px; box-shadow: var(--shadow); }
.article-body h1 { font-size: clamp(30px, 4vw, 48px); }
.article-body h2 { margin-top: 28px; }
.article-body ul { padding-left: 20px; color: var(--muted); }
.sidebar { display: grid; gap: 16px; position: sticky; top: 190px; }
.breadcrumb { color: var(--muted); font-size: 14px; margin-bottom: 16px; }
.breadcrumb a { color: var(--brand-dark); }
.notice { background: var(--warning); border: 1px solid #f1dfad; padding: 14px; border-radius: 18px; color: #746028; }
.footer-grid { max-width: 1180px; margin: 0 auto; padding: 36px 18px; display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 24px; }
.footer-logo span { font-size: 22px; font-weight: 900; }
.copyright { border-top: 1px solid var(--line); padding: 16px 18px; text-align: center; color: var(--muted); }
@media (max-width: 900px) {
    .hero, .article-layout, .footer-grid { grid-template-columns: 1fr; }
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .sidebar { position: static; }
}
@media (max-width: 620px) {
    .topbar, .section-head { align-items: flex-start; flex-direction: column; }
    .grid-3, .grid-4, .hero-meta { grid-template-columns: 1fr; }
    .search-box { flex-direction: column; }
    main { padding-top: 20px; }
    .hero-card, .article-body { padding: 22px; }
}