:root {
    --bg: #f6f8fb;
    --panel: #ffffff;
    --text: #1d2733;
    --muted: #627083;
    --brand: #da3743;
    --brand-dark: #a82430;
    --line: #e6eaf0;
    --soft: #fff1f2;
    --accent: #1d5b93;
    --shadow: 0 18px 45px rgba(28, 45, 68, .08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--brand); }
img { max-width: 100%; height: auto; display: block; }
.site-header, .site-footer { background: var(--panel); }
.topbar {
    display: flex;
    gap: 18px;
    justify-content: center;
    flex-wrap: wrap;
    padding: 8px 16px;
    font-size: 14px;
    color: var(--muted);
    border-bottom: 1px solid var(--line);
}
.brand-row {
    max-width: 1180px;
    margin: 0 auto;
    padding: 22px 18px 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}
.logo, .footer-logo { display: flex; align-items: center; gap: 14px; font-weight: 800; color: var(--text); }
.logo span { font-size: 26px; }
.logo img, .footer-logo img { border-radius: 16px; box-shadow: var(--shadow); }
.brand-slogan { margin: 0; color: var(--muted); }
.site-nav {
    max-width: 1180px;
    margin: 0 auto;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    padding: 0 18px 16px;
}
.site-nav a {
    padding: 9px 14px;
    background: #f1f4f8;
    border-radius: 999px;
    font-weight: 700;
}
.search-box {
    max-width: 1180px;
    margin: 0 auto 18px;
    padding: 14px 18px 24px;
    display: grid;
    grid-template-columns: minmax(120px, 180px) 1fr auto;
    gap: 10px;
    align-items: center;
}
.search-box label { font-weight: 800; }
.search-box input {
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 12px 14px;
    font-size: 16px;
    background: #fff;
}
.search-box button, .primary-btn, .small-btn {
    border: 0;
    border-radius: 14px;
    background: var(--brand);
    color: #fff;
    padding: 12px 18px;
    font-weight: 800;
    cursor: pointer;
}
.search-tip { grid-column: 2 / 4; margin: 0; color: var(--muted); font-size: 14px; }
main { max-width: 1180px; margin: 0 auto; padding: 0 18px 36px; }
.hero {
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    gap: 26px;
    align-items: center;
    background: linear-gradient(135deg, #ffffff 0%, #fff3f4 100%);
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 28px;
    box-shadow: var(--shadow);
}
.breadcrumb, .eyebrow { color: var(--brand); font-weight: 800; }
.hero h1 { margin: 10px 0 12px; font-size: clamp(30px, 4vw, 54px); line-height: 1.14; }
.hero p { color: var(--muted); margin: 0 0 16px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 18px 0; }
.primary-btn { display: inline-flex; align-items: center; }
.secondary-btn {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 11px 18px;
    font-weight: 800;
    background: #fff;
}
.stats { display: flex; gap: 12px; flex-wrap: wrap; color: var(--muted); font-size: 14px; }
.hero figure, .media-figure { margin: 0; position: relative; }
.hero img, .card img, .article-cover img { border-radius: 24px; border: 1px solid var(--line); }
figcaption { color: var(--muted); font-size: 13px; margin-top: 8px; }
.section { margin-top: 28px; }
.section-head { display: flex; justify-content: space-between; gap: 16px; align-items: end; margin-bottom: 14px; }
.section h2 { margin: 0; font-size: 28px; }
.section-head p { margin: 0; color: var(--muted); }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card, .article-card, .author-card, .faq-item, .comment-card, .contact-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 18px;
    box-shadow: var(--shadow);
}
.card h3, .article-card h3 { margin: 10px 0 8px; font-size: 21px; line-height: 1.35; }
.card p, .article-card p, .author-card p, .comment-card p { color: var(--muted); margin: 0; }
.meta, .tag-list, .metrics { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; color: var(--muted); font-size: 14px; }
.tag-list span, .tag-list a { background: #f1f4f8; padding: 4px 9px; border-radius: 999px; }
.video-card { position: relative; overflow: hidden; padding: 0; }
.video-shell { position: relative; }
.video-shell video, .video-shell img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 24px 24px 0 0; }
.play-button {
    position: absolute;
    left: 50%; top: 50%;
    transform: translate(-50%, -50%);
    width: 68px; height: 68px;
    border-radius: 50%;
    background: rgba(218,55,67,.92);
    display: grid; place-items: center;
    color: #fff;
    font-size: 28px;
    opacity: 0;
    transition: opacity .2s ease, transform .2s ease;
}
.video-card:hover .play-button, .video-card:focus-within .play-button { opacity: 1; transform: translate(-50%, -50%) scale(1.05); }
.video-content { padding: 16px; }
.timeline { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.timeline li { display: grid; grid-template-columns: 120px 1fr; gap: 10px; padding: 14px; background: var(--panel); border-radius: 18px; border: 1px solid var(--line); }
.rank-list { counter-reset: rank; list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.rank-list li { counter-increment: rank; background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 13px 14px; }
.rank-list li::before { content: counter(rank); display: inline-grid; place-items: center; width: 28px; height: 28px; margin-right: 10px; border-radius: 50%; color: #fff; background: var(--brand); font-weight: 800; }
.faq-item h3 { margin: 0 0 8px; }
.cta { background: var(--text); color: #fff; border-radius: 28px; padding: 28px; display: grid; gap: 8px; }
.cta p { color: #dce4ee; margin: 0; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 22px; align-items: start; }
.article-main, .sidebar-box { background: var(--panel); border: 1px solid var(--line); border-radius: 24px; padding: 22px; box-shadow: var(--shadow); }
.article-main h1 { margin: 8px 0 12px; font-size: clamp(28px, 4vw, 46px); line-height: 1.18; }
.article-body p { font-size: 18px; color: #344256; }
.sidebar { display: grid; gap: 18px; }
.related a, .footer-grid a { display: block; margin: 7px 0; color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); }
.footer-grid { max-width: 1180px; margin: 0 auto; padding: 30px 18px; display: grid; grid-template-columns: 1.3fr .8fr .9fr; gap: 24px; }
.footer-grid h2 { font-size: 18px; margin: 0 0 8px; }
.footer-grid p { color: var(--muted); }
.copyright { border-top: 1px solid var(--line); padding: 14px 18px; display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; color: var(--muted); font-size: 14px; }
.notice { color: var(--muted); font-size: 14px; }
@media (max-width: 900px) {
    .brand-row, .section-head { align-items: flex-start; flex-direction: column; }
    .hero, .article-layout, .footer-grid, .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .search-box { grid-template-columns: 1fr; }
    .search-tip { grid-column: auto; }
    .timeline li { grid-template-columns: 1fr; }
}