:root {
    --primary: rgb(70,139,223);
    --primary-soft: rgba(70,139,223,.12);
    --primary-faint: rgba(70,139,223,.07);
    --text: #132238;
    --muted: #617085;
    --line: #dbe8f7;
    --card: #ffffff;
    --bg: #f6faff;
    --blue-dark: #102d55;
    --shadow: 0 18px 50px rgba(37, 78, 130, .10);
    --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #f3f8ff 0%, #ffffff 38%, #f7fbff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(18px);
    background: rgba(255,255,255,.86);
    border-bottom: 1px solid rgba(211,226,245,.75);
}
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; color: var(--blue-dark); }
.logo { width: 34px; height: 34px; border-radius: 10px; }
.site-nav { display: none; flex-direction: column; gap: 10px; position: absolute; left: 16px; right: 16px; top: 68px; padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.site-nav a { color: #40506a; font-size: 15px; padding: 10px 12px; border-radius: 12px; }
.site-nav a:hover { background: var(--primary-faint); color: var(--primary); }
.nav-toggle { display: none; }
.nav-button { width: 42px; height: 42px; display: grid; place-content: center; gap: 5px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.nav-button span { width: 18px; height: 2px; background: var(--blue-dark); border-radius: 3px; display: block; }
.nav-toggle:checked ~ .site-nav { display: flex; }
.section { padding: 58px 0; }
.section-tight { padding: 38px 0; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 700;
    font-size: 13px;
}
.center { text-align: center; }
h1, h2, h3 { line-height: 1.18; color: var(--blue-dark); margin: 0 0 14px; letter-spacing: -.04em; }
h1 { font-size: clamp(34px, 7vw, 64px); }
h2 { font-size: clamp(28px, 4.6vw, 44px); }
h3 { font-size: 21px; }
p { margin: 0 0 16px; color: var(--muted); }
.lead { font-size: clamp(17px, 2vw, 20px); color: #43546e; max-width: 760px; }
.hero-layout {
    display: grid;
    gap: 34px;
    align-items: center;
    padding: 58px 0 30px;
}
.hero-copy { display: grid; gap: 18px; }
.hero-copy .lead { max-width: 660px; }
.security-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; }
.security-tags span, .tag-row span {
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #40506a;
    font-size: 13px;
    box-shadow: 0 8px 24px rgba(70,139,223,.06);
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    min-width: 138px;
    padding: 13px 24px;
    background: var(--primary);
    color: #fff;
    border-radius: 999px;
    font-weight: 800;
    box-shadow: 0 14px 32px rgba(70,139,223,.28);
    transition: transform .2s ease, box-shadow .2s ease;
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 18px 40px rgba(70,139,223,.34); }
.hero-visual { position: relative; }
.product-panel {
    background: linear-gradient(145deg, rgba(255,255,255,.94), rgba(239,247,255,.9));
    border: 1px solid rgba(199,222,248,.95);
    border-radius: 30px;
    padding: 22px;
    box-shadow: var(--shadow);
    min-height: 520px;
    display: grid;
    place-items: center;
    position: relative;
    overflow: hidden;
}
.product-panel::before { content: ''; position: absolute; width: 340px; height: 340px; background: radial-gradient(circle, rgba(70,139,223,.20), transparent 65%); top: -90px; right: -90px; }
.app-image { width: min(270px, 75%); margin: auto; border-radius: 30px; filter: drop-shadow(0 28px 35px rgba(31,72,120,.18)); position: relative; z-index: 1; }
.float-card {
    position: relative;
    z-index: 2;
    width: 100%;
    padding: 13px 14px;
    margin-top: 10px;
    border-radius: 18px;
    background: rgba(255,255,255,.88);
    border: 1px solid rgba(211,226,245,.9);
    box-shadow: 0 12px 30px rgba(50,89,137,.09);
    color: #40506a;
    font-size: 14px;
}
.float-card strong { color: var(--blue-dark); display: block; }
.float-card.ok { border-color: rgba(70,139,223,.35); }
.metrics-bar {
    display: grid;
    gap: 14px;
    grid-template-columns: 1fr;
}
.metric, .card, .category-card, .feature-card, .scenario-card, .faq-item, .note-card, .doc-card {
    background: rgba(255,255,255,.9);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 12px 34px rgba(31,72,120,.06);
}
.metric strong { display: block; color: var(--blue-dark); font-size: 18px; margin-bottom: 6px; }
.metric span { color: var(--muted); font-size: 14px; }
.section-heading { margin-bottom: 24px; }
.section-heading p { max-width: 760px; }
.path-steps, .steps { display: grid; gap: 16px; }
.step-card {
    position: relative;
    padding: 22px;
    border-radius: 22px;
    border: 1px solid var(--line);
    background: linear-gradient(180deg, #fff, #f7fbff);
    box-shadow: 0 12px 34px rgba(31,72,120,.06);
}
.step-no { width: 34px; height: 34px; border-radius: 12px; background: var(--primary); color: #fff; display: inline-grid; place-items: center; font-weight: 800; margin-bottom: 14px; }
.step-card a, .category-card a, .scenario-card a, .doc-link { color: var(--primary); font-weight: 800; }
.category-grid, .feature-grid, .scenario-grid, .recommend-grid { display: grid; gap: 16px; }
.category-card { min-height: 168px; display: flex; flex-direction: column; justify-content: space-between; }
.feature-grid { grid-template-columns: 1fr; }
.feature-card { background: linear-gradient(145deg, #fff, #f4f9ff); }
.feature-card.large { background: linear-gradient(145deg, rgba(70,139,223,.13), #fff); }
.feature-icon { width: 42px; height: 42px; border-radius: 15px; background: var(--primary-soft); color: var(--primary); display: grid; place-items: center; font-weight: 900; margin-bottom: 18px; }
.security-layout { display: grid; gap: 24px; align-items: start; }
.security-panel { padding: 24px; border-radius: 26px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.principle-list { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.principle-list li { padding: 14px 15px; border-radius: 16px; background: var(--primary-faint); color: #334761; }
.process-strip { display: grid; gap: 14px; }
.process-item { padding: 18px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { font-size: 18px; margin-bottom: 8px; }
.cta-section {
    text-align: center;
    border-radius: 30px;
    padding: 42px 22px;
    background: linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.96));
    border: 1px solid rgba(199,222,248,.95);
    box-shadow: var(--shadow);
}
.cta-section p { max-width: 680px; margin-left: auto; margin-right: auto; }
.page-hero { padding: 54px 0 26px; }
.page-hero-inner { display: grid; gap: 18px; max-width: 850px; }
.doc-layout { display: grid; gap: 22px; align-items: start; }
.article { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: 0 14px 40px rgba(31,72,120,.06); }
.article h2 { font-size: 26px; margin-top: 28px; }
.article h2:first-child { margin-top: 0; }
.article ul, .article ol { color: var(--muted); padding-left: 22px; }
.article li { margin: 8px 0; }
.side-panel { display: grid; gap: 16px; }
.note-card strong { display: block; color: var(--blue-dark); margin-bottom: 8px; }
.table-like { display: grid; gap: 10px; }
.table-like div { display: flex; justify-content: space-between; gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
.table-like b { color: var(--blue-dark); }
.site-footer { margin-top: 60px; background: #0f2748; color: #d9e7f7; padding: 44px 0 22px; }
.site-footer p, .site-footer a { color: #b9cce3; display: block; margin: 8px 0; }
.footer-grid { display: grid; gap: 26px; }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; color: #fff; margin-bottom: 10px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h3 { color: #fff; font-size: 17px; margin-bottom: 12px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.14); margin-top: 30px; padding-top: 18px; font-size: 13px; color: #9fb6d1; }
@media (min-width: 680px) {
    .metrics-bar { grid-template-columns: repeat(2, 1fr); }
    .category-grid, .scenario-grid, .recommend-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .path-steps, .steps { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.4fr .8fr .8fr; }
}
@media (min-width: 960px) {
    .nav-button { display: none; }
    .site-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { padding: 8px 10px; }
    .hero-layout { grid-template-columns: 1.02fr .98fr; padding: 82px 0 42px; }
    .product-panel { min-height: 560px; }
    .float-card { position: absolute; width: 214px; margin: 0; }
    .float-card.one { left: 22px; top: 28px; }
    .float-card.two { right: 20px; top: 104px; }
    .float-card.three { left: 26px; bottom: 76px; }
    .float-card.four { right: 28px; bottom: 32px; }
    .metrics-bar { grid-template-columns: repeat(4, 1fr); }
    .path-steps { grid-template-columns: repeat(6, 1fr); }
    .path-steps .step-card { padding: 18px; }
    .category-grid { grid-template-columns: repeat(6, 1fr); }
    .category-card { grid-column: span 2; }
    .category-card.wide { grid-column: span 3; }
    .feature-grid { grid-template-columns: repeat(3, 1fr); }
    .feature-card.large { grid-column: span 2; min-height: 250px; }
    .security-layout { grid-template-columns: 1fr .82fr; }
    .process-strip { grid-template-columns: repeat(4, 1fr); }
    .scenario-grid { grid-template-columns: repeat(5, 1fr); }
    .scenario-card { grid-column: span 1; }
    .doc-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .article { padding: 34px; }
}