:root {
    --primary: rgb(70,139,223);
    --primary-dark: #235da9;
    --primary-soft: #eef6ff;
    --bg: #f7fbff;
    --text: #14233b;
    --muted: #64748b;
    --line: #dbe8f7;
    --card: #ffffff;
    --shadow: 0 18px 50px rgba(31, 91, 158, 0.12);
    --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #f5faff 0%, #ffffff 42%, #f7fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(100% - 32px, 1160px); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(219,232,247,.8);
}
.header-inner { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .2px; }
.logo { width: 38px; height: 38px; border-radius: 12px; }
.brand-text { color: #102a4c; font-size: 18px; }
.site-nav { display: none; flex-direction: column; position: absolute; left: 16px; right: 16px; top: 70px; padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.site-nav.is-open { display: flex; }
.site-nav a { padding: 11px 12px; color: #31506f; font-weight: 650; border-radius: 12px; }
.site-nav a.active, .site-nav a:hover { color: var(--primary); background: var(--primary-soft); }
.nav-toggle { display: inline-flex; width: 44px; height: 44px; align-items: center; justify-content: center; flex-direction: column; gap: 5px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.nav-toggle span { width: 19px; height: 2px; background: #1f3d5f; border-radius: 4px; }
.hero { padding: 46px 0 34px; }
.hero-shell {
    border: 1px solid rgba(116,166,230,.28);
    border-radius: 30px;
    padding: 22px;
    background: radial-gradient(circle at 20% 0%, rgba(70,139,223,.16), transparent 34%), linear-gradient(135deg, #ffffff 0%, #eef6ff 100%);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.hero-layout { display: grid; grid-template-columns: 1fr; gap: 26px; align-items: center; }
.eyebrow, .badge { display: inline-flex; align-items: center; gap: 8px; color: var(--primary-dark); background: rgba(70,139,223,.1); border: 1px solid rgba(70,139,223,.18); border-radius: 999px; padding: 7px 12px; font-size: 13px; font-weight: 750; }
h1 { font-size: clamp(30px, 8vw, 58px); line-height: 1.08; margin: 16px 0 16px; letter-spacing: -1.2px; color: #0e2441; }
.hero p, .section-lead, .page-lead { color: #54677f; font-size: 16px; margin: 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 24px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(70,139,223,.28);
    border: 1px solid rgba(255,255,255,.28);
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 34px rgba(70,139,223,.34); }
.inline-note { color: var(--muted); font-size: 14px; }
.hero-visual { position: relative; min-height: 420px; display: grid; place-items: center; }
.phone-card { width: min(300px, 82vw); border-radius: 36px; padding: 13px; background: rgba(255,255,255,.72); border: 1px solid rgba(255,255,255,.75); box-shadow: 0 28px 70px rgba(16,62,120,.18); }
.phone-card img { border-radius: 28px; }
.float-card { position: absolute; max-width: 220px; padding: 13px 15px; border: 1px solid rgba(205,224,245,.9); border-radius: 18px; background: rgba(255,255,255,.9); backdrop-filter: blur(12px); box-shadow: 0 16px 34px rgba(31,91,158,.12); }
.float-card strong { display: block; font-size: 14px; margin-bottom: 2px; }
.float-card span { display: block; color: var(--muted); font-size: 12px; line-height: 1.5; }
.card-a { left: 0; top: 28px; }
.card-b { right: 0; top: 100px; }
.card-c { left: 8px; bottom: 48px; }
.card-d { right: 10px; bottom: 8px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
.tag { padding: 7px 10px; border-radius: 999px; background: #fff; border: 1px solid var(--line); color: #31506f; font-size: 13px; font-weight: 700; }
.section { padding: 42px 0; }
.section-head { max-width: 760px; margin-bottom: 22px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-kicker { color: var(--primary); font-weight: 850; font-size: 14px; margin-bottom: 8px; }
h2 { font-size: clamp(24px, 5vw, 38px); line-height: 1.18; margin: 0 0 12px; color: #102a4c; letter-spacing: -.4px; }
h3 { margin: 0 0 8px; color: #142d4f; line-height: 1.35; }
.metric-strip { display: grid; grid-template-columns: 1fr; gap: 14px; }
.metric-item, .feature-card, .category-card, .scenario-card, .faq-item, .guide-card, .info-panel, .step-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 12px 36px rgba(31,91,158,.08);
}
.metric-item { padding: 18px; }
.metric-item strong { color: var(--primary-dark); font-size: 18px; display: block; }
.metric-item span { color: var(--muted); font-size: 14px; }
.steps-grid, .category-grid, .feature-grid, .scenario-grid, .recommend-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.step-card { padding: 18px; position: relative; overflow: hidden; }
.step-num { width: 34px; height: 34px; display: grid; place-items: center; background: var(--primary); color: #fff; border-radius: 12px; font-weight: 850; margin-bottom: 12px; }
.step-card p, .feature-card p, .category-card p, .scenario-card p, .guide-card p, .info-panel p { margin: 0; color: var(--muted); }
.step-card a, .category-card a, .recommend-grid a { color: var(--primary-dark); font-weight: 800; display: inline-flex; margin-top: 12px; }
.category-card { padding: 20px; min-height: 170px; background: linear-gradient(180deg, #fff 0%, #f6fbff 100%); transition: transform .2s ease, border-color .2s ease; }
.category-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.42); }
.icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 15px; background: rgba(70,139,223,.1); color: var(--primary); font-weight: 900; margin-bottom: 12px; }
.feature-card { padding: 22px; }
.security-layout, .split-layout { display: grid; grid-template-columns: 1fr; gap: 22px; align-items: center; }
.security-panel { padding: 20px; border-radius: 28px; background: linear-gradient(135deg, #edf6ff, #ffffff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.panel-row { display: flex; justify-content: space-between; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.panel-row:last-child { border-bottom: 0; }
.panel-row span { color: var(--muted); }
.panel-row strong { color: var(--primary-dark); text-align: right; }
.process { counter-reset: process; display: grid; gap: 14px; }
.process li { list-style: none; position: relative; padding: 18px 18px 18px 62px; background: #fff; border: 1px solid var(--line); border-radius: 18px; color: var(--muted); }
.process li:before { counter-increment: process; content: counter(process); position: absolute; left: 18px; top: 18px; width: 30px; height: 30px; display: grid; place-items: center; border-radius: 11px; background: var(--primary); color: #fff; font-weight: 850; }
.scenario-card { padding: 20px; }
.faq-list { display: grid; gap: 12px; }
.faq-item { padding: 18px; }
.faq-item p { color: var(--muted); margin: 6px 0 0; }
.cta-section { margin: 42px 0; padding: 34px 20px; border-radius: 30px; background: radial-gradient(circle at 15% 20%, rgba(70,139,223,.18), transparent 30%), linear-gradient(135deg, #eef6ff, #ffffff); border: 1px solid var(--line); text-align: center; box-shadow: var(--shadow); }
.cta-section p { color: var(--muted); max-width: 680px; margin: 0 auto 20px; }
.page-hero { padding: 44px 0 20px; }
.page-card { padding: 24px; border-radius: 30px; background: linear-gradient(135deg, #fff, #f1f8ff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.content-layout { display: grid; grid-template-columns: 1fr; gap: 18px; }
.article-body { background: #fff; border: 1px solid var(--line); border-radius: 26px; padding: 22px; box-shadow: 0 12px 36px rgba(31,91,158,.07); }
.article-body p { color: #4b5f78; margin: 0 0 16px; }
.article-body ul, .article-body ol { padding-left: 20px; color: #4b5f78; }
.article-body li { margin: 8px 0; }
.side-panel { display: grid; gap: 14px; }
.info-panel { padding: 18px; }
.notice { border-left: 4px solid var(--primary); padding: 14px 16px; background: var(--primary-soft); border-radius: 16px; color: #31506f; }
.download-steps { display: grid; gap: 14px; margin: 24px 0; }
.download-steps .step-card { display: flex; gap: 14px; align-items: flex-start; }
.download-steps .step-num { flex: 0 0 auto; margin-bottom: 0; }
.site-footer { margin-top: 44px; padding: 42px 0 22px; background: #102a4c; color: rgba(255,255,255,.78); }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 26px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; margin-bottom: 12px; }
.footer-brand img { width: 36px; height: 36px; border-radius: 12px; }
.site-footer h3 { color: #fff; font-size: 16px; }
.site-footer a { display: block; color: rgba(255,255,255,.72); margin: 7px 0; }
.footer-bottom { display: flex; flex-direction: column; gap: 8px; border-top: 1px solid rgba(255,255,255,.12); margin-top: 28px; padding-top: 18px; font-size: 13px; color: rgba(255,255,255,.58); }
@media (min-width: 640px) {
    .metric-strip { grid-template-columns: repeat(2, 1fr); }
    .category-grid, .feature-grid, .scenario-grid, .recommend-grid, .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .download-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 920px) {
    .container { width: min(100% - 48px, 1160px); }
    .nav-toggle { display: none; }
    .site-nav { display: flex; position: static; flex-direction: row; align-items: center; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { padding: 9px 12px; }
    .hero { padding: 64px 0 48px; }
    .hero-shell { padding: 42px; }
    .hero-layout { grid-template-columns: minmax(0, 1.04fr) minmax(380px, .96fr); gap: 42px; }
    .metric-strip { grid-template-columns: repeat(4, 1fr); }
    .category-grid, .feature-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .steps-grid { grid-template-columns: repeat(3, 1fr); }
    .security-layout, .split-layout { grid-template-columns: 1fr .92fr; gap: 38px; }
    .content-layout { grid-template-columns: minmax(0, 1fr) 320px; gap: 24px; align-items: start; }
    .article-body, .page-card { padding: 34px; }
    .process { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: 1.5fr .8fr .8fr .8fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}
@media (min-width: 1100px) {
    .category-grid { grid-template-columns: repeat(4, 1fr); }
    .recommend-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 440px) {
    .container { width: min(100% - 24px, 1160px); }
    .hero-shell, .page-card { border-radius: 24px; padding: 18px; }
    .hero-visual { min-height: 380px; }
    .float-card { max-width: 178px; padding: 10px 12px; }
    .card-a { left: -2px; top: 8px; }
    .card-b { right: -2px; top: 92px; }
    .card-c { left: -2px; bottom: 48px; }
    .card-d { right: -2px; bottom: 0; }
    .download-btn { width: 100%; }
}