:root {
    --bg: #f6f4ef;
    --paper: #ffffff;
    --ink: #1f2933;
    --muted: #5f6b7a;
    --line: #e4dfd3;
    --brand: #1e3a5f;
    --accent: #b9853f;
    --soft: #eef3f8;
    --shadow: 0 20px 60px rgba(31, 41, 51, .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;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.94); border-bottom: 1px solid var(--line); backdrop-filter: blur(14px); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 16px 0 10px; }
.brand-logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--brand); font-size: 1.2rem; }
.brand-logo img { width: 44px; height: 44px; border-radius: 14px; }
.main-nav { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; font-size: .95rem; }
.main-nav a { color: var(--muted); padding: 8px 10px; border-radius: 999px; }
.main-nav a:hover, .nav-cta { color: var(--brand); background: var(--soft); }
.search-wrap { padding: 0 0 14px; }
.search-form { display: flex; gap: 10px; background: var(--soft); padding: 8px; border-radius: 18px; border: 1px solid #dce6ef; }
.search-form input { flex: 1; border: 0; background: transparent; padding: 10px 12px; font-size: 1rem; outline: none; }
.search-form button, .btn { border: 0; border-radius: 999px; padding: 11px 18px; font-weight: 700; cursor: pointer; transition: transform .2s ease, box-shadow .2s ease; }
.search-form button, .btn.primary { background: var(--brand); color: #fff; }
.btn.ghost { border: 1px solid var(--line); color: var(--brand); background: #fff; }
.btn.light { background: #fff; color: var(--brand); }
.btn:hover, .search-form button:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.search-message { margin: 8px 0 0; color: var(--muted); font-size: .9rem; }
.section { padding: 76px 0; }
.section-soft { background: linear-gradient(135deg, #ffffff 0%, var(--soft) 100%); }
.hero { padding: 90px 0 76px; }
.hero-grid, .split-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 48px; align-items: center; }
.hero h1, .page-hero h1 { font-size: clamp(2.2rem, 5vw, 4.5rem); line-height: 1.08; margin: 14px 0 20px; letter-spacing: -.04em; }
.hero-subtitle { color: var(--muted); font-size: 1.12rem; max-width: 760px; }
.eyebrow { color: var(--accent); font-weight: 800; letter-spacing: .08em; text-transform: uppercase; margin: 0 0 10px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 28px 0; }
.trust-list, .check-list { padding: 0; margin: 20px 0 0; list-style: none; }
.trust-list li, .check-list li { margin: 10px 0; padding-left: 30px; position: relative; }
.trust-list li::before, .check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 900; }
.media-figure { margin: 0; background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 12px; box-shadow: var(--shadow); }
.media-figure img { border-radius: 20px; aspect-ratio: 4 / 3; object-fit: cover; width: 100%; }
.media-figure figcaption { color: var(--muted); font-size: .9rem; margin-top: 10px; }
.section-head { max-width: 780px; margin-bottom: 34px; }
.section-head h2, .split-section h2, .contact-band h2 { font-size: clamp(1.7rem, 3vw, 2.7rem); line-height: 1.18; margin: 0 0 14px; }
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-grid { grid-template-columns: repeat(3, 1fr); }
.info-card, .scenario-card, .review-card, .metric-card, .notice-box, .form-card { background: var(--paper); border: 1px solid var(--line); border-radius: 24px; padding: 24px; box-shadow: 0 8px 26px rgba(31,41,51,.06); }
.info-card h2, .info-card h3, .scenario-card h3 { margin-top: 0; color: var(--brand); }
.info-card p, .scenario-card p, .review-card p { color: var(--muted); }
.info-card a { color: var(--accent); font-weight: 800; }
.icon-dot { display: inline-flex; width: 46px; height: 46px; border-radius: 16px; background: var(--soft); align-items: center; justify-content: center; color: var(--brand); font-size: .72rem; font-weight: 800; margin-bottom: 12px; }
.scenario-grid, .review-grid, .metric-grid, .contact-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.review-grid { grid-template-columns: repeat(3, 1fr); }
.contact-list { grid-template-columns: repeat(3, 1fr); }
.metric-card strong { display: block; color: var(--brand); font-size: 2.4rem; line-height: 1; }
.metric-card span { color: var(--muted); }
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.video-card { background: #fff; border: 1px solid var(--line); border-radius: 26px; overflow: hidden; box-shadow: var(--shadow); }
.video-poster { position: relative; overflow: hidden; }
.video-poster img { width: 100%; aspect-ratio: 16/10; object-fit: cover; transition: transform .35s ease, filter .35s ease; }
.play-button { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%) scale(.88); width: 68px; height: 68px; border: 0; border-radius: 999px; background: rgba(255,255,255,.92); color: var(--brand); font-size: 1.6rem; opacity: 0; cursor: pointer; box-shadow: var(--shadow); transition: opacity .25s ease, transform .25s ease; }
.video-card:hover .play-button, .video-card:focus-within .play-button { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.video-card:hover img { transform: scale(1.05); filter: brightness(.84); }
.video-body { padding: 20px; }
.video-body h3 { margin: 0 0 8px; color: var(--brand); }
.video-body p { color: var(--muted); }
.video-stats, .tag-row { display: flex; flex-wrap: wrap; gap: 8px; font-size: .88rem; color: var(--muted); }
.tag-row span, .pill { background: var(--soft); color: var(--brand); padding: 5px 10px; border-radius: 999px; display: inline-block; font-weight: 700; }
.timeline { display: grid; gap: 16px; }
.timeline article { background: #fff; border-left: 4px solid var(--accent); border-radius: 18px; padding: 20px 24px; box-shadow: 0 8px 24px rgba(31,41,51,.06); }
.timeline time { color: var(--accent); font-weight: 900; }
.timeline h2, .timeline h3 { color: var(--brand); margin: 6px 0; }
.faq-list { display: grid; gap: 14px; }
details { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 18px 22px; }
summary { cursor: pointer; font-weight: 800; color: var(--brand); }
details p { color: var(--muted); }
.contact-band { background: var(--brand); color: #fff; }
.contact-band .eyebrow, .contact-band p { color: rgba(255,255,255,.78); }
.contact-grid { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; }
.breadcrumb { width: min(1160px, calc(100% - 32px)); margin: 22px auto 0; color: var(--muted); display: flex; gap: 8px; flex-wrap: wrap; font-size: .92rem; }
.breadcrumb a { color: var(--brand); font-weight: 700; }
.page-hero { padding: 70px 0; }
.contact-form { display: grid; gap: 16px; }
.contact-form label { display: grid; gap: 8px; color: var(--brand); font-weight: 700; }
.contact-form input, .contact-form select, .contact-form textarea { border: 1px solid var(--line); border-radius: 14px; padding: 12px; font: inherit; }
.contact-form textarea { min-height: 120px; resize: vertical; }
.site-footer { background: #111827; color: #e8eef5; padding: 54px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 30px; }
.footer-grid p, .footer-grid a, .footer-bottom { color: #b7c3d1; }
.footer-grid h2 { font-size: 1rem; color: #fff; }
.footer-grid ul { list-style: none; padding: 0; }
.footer-grid li { margin: 8px 0; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 34px; padding-top: 18px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-logo { color: #fff; margin-bottom: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
@media (max-width: 920px) {
    .header-inner, .hero-grid, .split-grid, .contact-grid, .footer-grid { grid-template-columns: 1fr; display: grid; }
    .main-nav { font-size: .9rem; }
    .card-grid, .feature-grid, .scenario-grid, .review-grid, .metric-grid, .video-grid, .contact-list { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { text-align: left; }
}
@media (max-width: 640px) {
    .container { width: min(100% - 22px, 1160px); }
    .section { padding: 52px 0; }
    .hero { padding: 62px 0; }
    .search-form { flex-direction: column; }
    .card-grid, .feature-grid, .scenario-grid, .review-grid, .metric-grid, .video-grid, .contact-list { grid-template-columns: 1fr; }
    .main-nav { gap: 6px; }
    .main-nav a { padding: 7px 8px; }
}