:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fba;
    --primary-soft: #eaf4ff;
    --ink: #172033;
    --muted: #607086;
    --line: #dce8f6;
    --card: rgba(255, 255, 255, 0.92);
    --bg: #f6faff;
    --shadow: 0 18px 45px rgba(28, 82, 140, 0.10);
    --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(--ink);
    background: linear-gradient(180deg, #f8fbff 0%, #eef7ff 45%, #ffffff 100%);
    line-height: 1.75;
    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: 50;
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(220,232,246,0.9);
}
.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.02em; color: #14345f; }
.logo img { width: 38px; height: 38px; border-radius: 12px; box-shadow: 0 8px 20px rgba(70,139,223,.22); }
.nav-toggle { display: inline-flex; flex-direction: column; gap: 5px; border: 0; background: #edf6ff; border-radius: 12px; padding: 11px; cursor: pointer; }
.nav-toggle span { width: 22px; height: 2px; background: #23456f; border-radius: 999px; }
.main-nav { display: none; position: absolute; left: 16px; right: 16px; top: 72px; padding: 12px; background: rgba(255,255,255,.97); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.main-nav.is-open { display: grid; gap: 6px; }
.main-nav a { padding: 12px 14px; border-radius: 12px; color: #38506e; font-weight: 650; font-size: 15px; }
.main-nav a.active, .main-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.hero { padding: 48px 0 34px; }
.hero-layout { display: grid; gap: 28px; align-items: center; }
.eyebrow, .badge { display: inline-flex; align-items: center; gap: 8px; width: fit-content; padding: 6px 12px; border-radius: 999px; background: #e8f3ff; color: var(--primary-dark); font-weight: 700; font-size: 13px; }
h1 { margin: 14px 0 14px; font-size: clamp(32px, 8vw, 58px); line-height: 1.12; letter-spacing: -0.05em; color: #10223b; }
h2 { margin: 0 0 12px; font-size: clamp(24px, 4.5vw, 36px); line-height: 1.25; letter-spacing: -0.03em; color: #152642; }
h3 { margin: 0 0 8px; line-height: 1.35; color: #183252; }
p { margin: 0 0 14px; color: var(--muted); }
.lead { font-size: 17px; color: #4e6179; max-width: 680px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0; }
.hero-tags span, .pill { padding: 8px 11px; border-radius: 999px; background: #fff; color: #315274; border: 1px solid var(--line); font-size: 13px; font-weight: 650; box-shadow: 0 8px 18px rgba(31,95,186,.05); }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    letter-spacing: .02em;
    box-shadow: 0 14px 28px rgba(70,139,223,.28);
    border: 1px solid rgba(255,255,255,.45);
    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,.36); }
.hero-visual { position: relative; min-height: 420px; padding: 24px; border-radius: 30px; background: radial-gradient(circle at 20% 0%, #ffffff 0%, #eff7ff 38%, #dceeff 100%); box-shadow: var(--shadow); overflow: hidden; }
.hero-visual:before { content: ""; position: absolute; width: 260px; height: 260px; right: -80px; top: -80px; background: rgba(70,139,223,.16); border-radius: 50%; }
.app-frame { width: min(240px, 70%); margin: 22px auto 0; position: relative; z-index: 2; filter: drop-shadow(0 24px 45px rgba(25, 71, 126, .22)); }
.floating-card, .asset-card, .risk-card { position: relative; z-index: 3; background: rgba(255,255,255,.88); border: 1px solid rgba(210,226,244,.9); border-radius: 18px; box-shadow: 0 16px 35px rgba(28,82,140,.12); padding: 14px; }
.floating-card { max-width: 220px; }
.floating-card strong, .asset-card strong, .risk-card strong { display: block; color: #12335f; }
.floating-card small, .asset-card small, .risk-card small { color: #75869a; }
.asset-card { margin-top: -18px; max-width: 230px; margin-left: auto; }
.risk-card { margin-top: 16px; max-width: 260px; }
.status-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: #24b47e; margin-right: 8px; box-shadow: 0 0 0 5px rgba(36,180,126,.14); }
.visual-labels { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; position: relative; z-index: 4; }
.visual-labels span { padding: 7px 10px; border-radius: 999px; background: #eef7ff; color: #25598d; font-weight: 700; font-size: 12px; border: 1px solid #d8eafd; }
.section { padding: 38px 0; }
.section-head { margin-bottom: 22px; max-width: 760px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.metric-strip { display: grid; gap: 12px; grid-template-columns: 1fr; background: rgba(255,255,255,.78); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; box-shadow: var(--shadow); }
.metric { padding: 18px; border-radius: 18px; background: linear-gradient(180deg,#fff,#f3f9ff); border: 1px solid #e1edf9; }
.metric strong { display: block; color: var(--primary-dark); font-size: 20px; }
.metric span { color: var(--muted); font-size: 14px; }
.grid, .category-grid, .feature-grid, .scenario-grid, .recommend-grid { display: grid; gap: 16px; }
.category-grid { grid-template-columns: 1fr; }
.feature-grid { grid-template-columns: 1fr; }
.card, .category-card, .feature-card, .scenario-card, .faq-item, .guide-card, .notice-card, .step-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 12px 30px rgba(28,82,140,.07);
}
.category-card, .guide-card { transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease; }
.category-card:hover, .guide-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.45); box-shadow: var(--shadow); }
.card-icon { width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary-dark); font-weight: 900; margin-bottom: 12px; }
.steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; padding-left: 22px; }
.step-card:before { counter-increment: step; content: counter(step); display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 800; margin-bottom: 10px; }
.security-layout { display: grid; gap: 22px; align-items: center; }
.security-panel { background: linear-gradient(145deg, #ffffff 0%, #eef7ff 100%); border: 1px solid #dbeafb; border-radius: 28px; padding: 22px; box-shadow: var(--shadow); }
.security-list { display: grid; gap: 12px; margin-top: 14px; }
.security-list div { display: flex; gap: 10px; padding: 12px; border-radius: 15px; background: rgba(255,255,255,.76); border: 1px solid #e2eefb; }
.security-list b { color: var(--primary-dark); }
.process-line { display: grid; gap: 12px; }
.process-line .process-item { padding: 16px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.article-hero { padding: 46px 0 22px; }
.article-layout { display: grid; gap: 22px; align-items: start; }
.article-content { background: rgba(255,255,255,.9); border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.article-content h2 { font-size: clamp(22px, 4vw, 30px); margin-top: 22px; }
.article-aside { display: grid; gap: 14px; }
.check-list, .plain-list { padding: 0; margin: 14px 0 0; list-style: none; display: grid; gap: 10px; }
.check-list li, .plain-list li { padding: 12px 14px; border-radius: 14px; background: #f4f9ff; border: 1px solid #dfeefa; color: #415a75; }
.check-list li:before { content: "✓"; color: var(--primary-dark); font-weight: 900; margin-right: 8px; }
.warning { background: #fff7e8; border-color: #ffe2ae; }
.warning h3 { color: #7a4d05; }
.info-panel { background: #eef7ff; border: 1px solid #d6eafe; border-radius: 20px; padding: 18px; }
.cta-section { text-align: center; padding: 34px 20px; border-radius: 30px; background: linear-gradient(135deg, #eaf4ff, #ffffff 48%, #ddecff); border: 1px solid #d9eafb; box-shadow: var(--shadow); }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { font-size: 17px; }
.download-panel { max-width: 760px; margin: 0 auto; text-align: center; }
.download-steps { display: grid; gap: 14px; margin-top: 22px; text-align: left; }
.site-footer { margin-top: 40px; padding: 42px 0 0; background: #10233c; color: #dce9f9; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; margin-bottom: 12px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h3 { color: #fff; font-size: 16px; }
.site-footer p { color: #bfd0e6; }
.site-footer a { display: block; color: #bfd0e6; margin: 7px 0; font-size: 14px; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 30px; padding: 16px; border-top: 1px solid rgba(255,255,255,.12); text-align: center; color: #a9bdd6; font-size: 13px; }
@media (min-width: 640px) {
    .metric-strip { grid-template-columns: repeat(2, 1fr); }
    .category-grid, .feature-grid, .scenario-grid, .recommend-grid { grid-template-columns: repeat(2, 1fr); }
    .download-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .main-nav { display: flex; position: static; padding: 0; background: transparent; border: 0; border-radius: 0; box-shadow: none; gap: 4px; align-items: center; }
    .main-nav a { padding: 9px 12px; font-size: 14px; }
    .hero { padding: 72px 0 48px; }
    .hero-layout { grid-template-columns: 1.03fr .97fr; gap: 44px; }
    .metric-strip { grid-template-columns: repeat(4, 1fr); }
    .category-grid, .feature-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .recommend-grid { grid-template-columns: repeat(4, 1fr); }
    .steps { grid-template-columns: repeat(3, 1fr); }
    .security-layout { grid-template-columns: 1fr 1fr; }
    .process-line { grid-template-columns: repeat(4, 1fr); }
    .article-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .article-content { padding: 32px; }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
}
@media (min-width: 1100px) {
    .main-nav a { padding: 9px 15px; }
}