:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --ink: #17213a;
    --muted: #5f6d86;
    --line: #dbe3ef;
    --accent: #1c2b4a;
    --accent-soft: #edf2f9;
    --gold: #b9822b;
    --shadow: 0 18px 45px rgba(23, 33, 58, .08);
    --radius: 24px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}
.topline {
    max-width: 1180px;
    margin: 0 auto;
    padding: 16px 20px;
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    gap: 18px;
    align-items: center;
}
.brand-logo { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; }
.logo-mark {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    color: #fff;
    background: linear-gradient(135deg, #17213a, #3b4e72);
    box-shadow: var(--shadow);
}
.logo-text { display: flex; flex-direction: column; line-height: 1.1; font-size: 18px; }
.logo-text em { font-style: normal; font-size: 12px; color: var(--muted); font-weight: 600; margin-top: 4px; }
.header-domain { color: var(--muted); font-size: 14px; text-align: right; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.header-domain strong { color: var(--accent); }
.header-cta, .btn, .search-row button, .ghost-btn {
    border: 0;
    cursor: pointer;
    border-radius: 999px;
    padding: 12px 18px;
    font-weight: 800;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.header-cta, .btn, .search-row button {
    color: #fff;
    background: var(--accent);
    box-shadow: 0 12px 28px rgba(28, 43, 74, .18);
}
.ghost-btn {
    color: var(--accent);
    background: var(--accent-soft);
    border: 1px solid var(--line);
}
.header-cta:hover, .btn:hover, .search-row button:hover, .ghost-btn:hover { transform: translateY(-2px); }
.menu-toggle { display: none; border: 1px solid var(--line); background: #fff; border-radius: 12px; padding: 9px 12px; }
.main-nav {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 20px 12px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.main-nav a { padding: 8px 12px; border-radius: 999px; color: var(--muted); font-weight: 700; }
.main-nav a:hover, .main-nav a.active { background: var(--accent-soft); color: var(--accent); }
.search-panel {
    max-width: 1180px;
    margin: 0 auto 14px;
    padding: 0 20px;
}
.search-panel label { display: block; font-weight: 800; margin-bottom: 8px; }
.search-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.search-row input {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 12px 16px;
    background: #fff;
    font-size: 15px;
    outline: none;
}
.search-message { margin: 6px 0 0; color: var(--muted); font-size: 13px; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.hero {
    position: relative;
    overflow: hidden;
    padding: 72px 0 46px;
    background: radial-gradient(circle at 20% 20%, #ffffff 0, rgba(255,255,255,0) 38%), linear-gradient(135deg, #eef4fb, #f7f8fb);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 36px; align-items: center; }
.eyebrow { display: inline-flex; border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 6px 12px; color: var(--gold); font-weight: 800; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; margin: 0 0 16px; color: var(--ink); }
h1 { font-size: clamp(34px, 5vw, 64px); letter-spacing: -.04em; }
h2 { font-size: clamp(26px, 3vw, 40px); letter-spacing: -.03em; }
h3 { font-size: 21px; }
p { margin: 0 0 16px; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 28px 0; }
.hero-points { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 22px; }
.hero-points span { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 12px; font-weight: 800; color: var(--accent); }
.hero-media { position: relative; }
.hero-media figure { margin: 0; background: #fff; border: 1px solid var(--line); padding: 12px; border-radius: 32px; box-shadow: var(--shadow); }
.hero-media img { border-radius: 22px; }
.hero-media figcaption { color: var(--muted); font-size: 13px; margin: 10px 4px 0; }
.consultant-card {
    position: absolute;
    left: -18px;
    bottom: 38px;
    width: 260px;
    background: rgba(255,255,255,.94);
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 16px;
    box-shadow: var(--shadow);
}
.consultant-card strong { display: block; color: var(--accent); }
.section { padding: 64px 0; }
.section.alt { background: #fff; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 28px; }
.section-head p { max-width: 680px; }
.grid { display: grid; gap: 18px; }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.grid.four { grid-template-columns: repeat(4, 1fr); }
.card, .feature-card, .review-card, .faq-item, .process-step, .log-item, .contact-card, .article-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 12px 30px rgba(23,33,58,.05);
}
.feature-card .icon { width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); font-weight: 900; margin-bottom: 16px; }
.metric { color: var(--gold); font-weight: 900; }
.video-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.video-card { background: #fff; border: 1px solid var(--line); border-radius: 28px; overflow: hidden; box-shadow: var(--shadow); }
.video-cover { position: relative; aspect-ratio: 16/9; background: #e8eef7; overflow: hidden; }
.video-cover video { width: 100%; height: 100%; object-fit: cover; display: block; }
.video-cover::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(23,33,58,0), rgba(23,33,58,.34)); opacity: .72; transition: opacity .2s ease; }
.play-badge { position: absolute; left: 50%; top: 50%; z-index: 2; transform: translate(-50%, -50%) scale(.88); width: 70px; height: 70px; border: 0; border-radius: 999px; color: #fff; background: rgba(28,43,74,.92); cursor: pointer; opacity: 0; transition: opacity .2s ease, transform .2s ease; box-shadow: 0 16px 40px rgba(0,0,0,.25); }
.video-card:hover .play-badge { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.duration { position: absolute; right: 14px; bottom: 14px; z-index: 2; background: rgba(0,0,0,.62); color: #fff; border-radius: 999px; padding: 4px 10px; font-size: 13px; }
.video-body { padding: 22px; }
.tag { display: inline-flex; background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 4px 10px; font-size: 13px; font-weight: 800; margin-bottom: 12px; }
.video-stats { display: flex; flex-wrap: wrap; gap: 8px; color: var(--muted); font-size: 13px; }
.video-stats span { background: #f7f9fc; border: 1px solid var(--line); border-radius: 999px; padding: 4px 8px; }
.scenario { position: relative; overflow: hidden; }
.scenario img { border-radius: 18px; margin-bottom: 16px; }
.process { counter-reset: step; }
.process-step { position: relative; padding-left: 72px; }
.process-step::before { counter-increment: step; content: counter(step); position: absolute; left: 22px; top: 24px; width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; background: var(--accent); color: #fff; font-weight: 900; }
.log-item { display: grid; grid-template-columns: 88px 1fr; gap: 18px; align-items: start; }
.log-version { font-weight: 900; color: var(--gold); }
.faq-list { display: grid; gap: 14px; }
.faq-item summary { cursor: pointer; font-weight: 900; color: var(--accent); }
.faq-item p { margin-top: 12px; }
.review-card .stars { color: var(--gold); font-weight: 900; letter-spacing: 2px; margin-bottom: 10px; }
.review-meta { color: var(--muted); font-size: 14px; }
.contact-panel { display: grid; grid-template-columns: .9fr 1.1fr; gap: 24px; align-items: stretch; }
.contact-list { display: grid; gap: 12px; }
.contact-list li { list-style: none; border: 1px solid var(--line); background: #fff; border-radius: 18px; padding: 12px 14px; }
.contact-form { display: grid; gap: 12px; }
.contact-form input, .contact-form textarea, .contact-form select {
    width: 100%; border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; font: inherit; background: #fff;
}
.contact-form textarea { min-height: 130px; resize: vertical; }
.breadcrumb { max-width: 1180px; margin: 24px auto 0; padding: 0 20px; display: flex; gap: 8px; color: var(--muted); font-size: 14px; flex-wrap: wrap; }
.breadcrumb a { color: var(--accent); font-weight: 800; }
.page-hero { padding: 50px 0 28px; background: #fff; border-bottom: 1px solid var(--line); }
.article-content { display: grid; grid-template-columns: 1fr 330px; gap: 28px; align-items: start; }
.sidebar { position: sticky; top: 190px; display: grid; gap: 14px; }
.article-card img { border-radius: 18px; margin-bottom: 16px; }
.pill-list { display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 18px 0 0; }
.pill-list li { list-style: none; background: var(--accent-soft); color: var(--accent); border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; font-weight: 800; }
.site-footer { background: #121a2c; color: #fff; padding: 52px 0 22px; margin-top: 54px; }
.site-footer p, .site-footer a, .site-footer .copyright { color: rgba(255,255,255,.72); }
.footer-grid { max-width: 1180px; margin: 0 auto; padding: 0 20px; display: grid; grid-template-columns: 1.2fr .8fr 1fr; gap: 24px; }
.footer-grid h2 { color: #fff; font-size: 18px; }
.footer-grid a { display: block; margin: 7px 0; }
.footer-logo .logo-mark { background: #fff; color: #121a2c; }
.footer-logo .logo-text { color: #fff; }
.copyright { max-width: 1180px; margin: 28px auto 0; padding: 20px 20px 0; border-top: 1px solid rgba(255,255,255,.16); font-size: 13px; }
.update-time { color: #fff !important; font-weight: 800; }
.share-row { display: flex; flex-wrap: wrap; gap: 10px; }
.share-row button { border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 9px 12px; cursor: pointer; font-weight: 800; }
.notice { border-left: 4px solid var(--gold); background: #fff8ed; padding: 14px 16px; border-radius: 14px; color: #644316; }
@media (max-width: 920px) {
    .topline { grid-template-columns: 1fr auto; }
    .header-domain, .header-cta { display: none; }
    .menu-toggle { display: inline-flex; }
    .main-nav { display: none; flex-direction: column; }
    .main-nav.open { display: flex; }
    .search-row, .hero-grid, .grid.three, .grid.two, .grid.four, .video-grid, .contact-panel, .article-content, .footer-grid { grid-template-columns: 1fr; }
    .hero-points { grid-template-columns: 1fr; }
    .consultant-card { position: static; width: auto; margin-top: 14px; }
    .section-head { display: block; }
    .sidebar { position: static; }
}
@media (max-width: 560px) {
    .hero { padding-top: 42px; }
    .section { padding: 42px 0; }
    .card, .feature-card, .review-card, .faq-item, .process-step, .log-item, .contact-card, .article-card { padding: 18px; }
    .log-item { grid-template-columns: 1fr; }
    .process-step { padding-left: 18px; padding-top: 64px; }
}