:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245da5;
    --primary-soft: #eaf4ff;
    --ink: #102033;
    --muted: #5f7187;
    --line: #dbe8f7;
    --card: rgba(255,255,255,.86);
    --bg: #f6fbff;
    --shadow: 0 18px 45px rgba(54, 101, 160, .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(--ink);
    background:
        radial-gradient(circle at top left, rgba(70,139,223,.16), transparent 32rem),
        linear-gradient(180deg, #f8fcff 0%, #eef7ff 42%, #ffffff 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% - 36px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(219,232,247,.9);
}
.header-inner { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; }
.logo-img { width: 38px; height: 38px; border-radius: 12px; }
.brand-text { font-size: 1.05rem; }
.main-nav { display: none; flex-direction: column; position: absolute; left: 18px; right: 18px; top: 70px; padding: 14px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: var(--shadow); }
.main-nav a { padding: 11px 12px; border-radius: 12px; color: #40536a; font-size: .96rem; }
.main-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }
.nav-toggle { display: none; }
.nav-toggle-label { width: 42px; height: 42px; display: grid; place-content: center; gap: 5px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.nav-toggle-label span { width: 20px; height: 2px; background: var(--ink); border-radius: 4px; display: block; }
.nav-toggle:checked ~ .main-nav { display: flex; }
.section { padding: 64px 0; }
.section-title { max-width: 760px; margin-bottom: 28px; }
.kicker, .badge { display: inline-flex; align-items: center; gap: 7px; color: var(--primary-dark); background: rgba(70,139,223,.1); border: 1px solid rgba(70,139,223,.2); padding: 6px 12px; border-radius: 999px; font-weight: 700; font-size: .82rem; }
h1, h2, h3 { line-height: 1.18; margin: 0; letter-spacing: -.035em; }
h1 { font-size: clamp(2.1rem, 8vw, 5.1rem); }
h2 { font-size: clamp(1.7rem, 5.2vw, 3.1rem); }
h3 { font-size: 1.16rem; }
p { color: var(--muted); margin: 12px 0 0; }
.hero-banner { padding: 56px 0 36px; }
.hero-layout { display: grid; gap: 34px; align-items: center; }
.hero-copy { position: relative; z-index: 2; }
.hero-copy .lead { font-size: 1.08rem; max-width: 720px; margin-top: 18px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; margin-top: 26px; }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.security-tags span, .mini-tag { border: 1px solid var(--line); background: rgba(255,255,255,.78); border-radius: 999px; padding: 8px 12px; color: #344c66; font-size: .9rem; }
.product-visual { position: relative; min-height: 430px; padding: 24px; border-radius: 28px; background: linear-gradient(145deg, rgba(70,139,223,.16), rgba(255,255,255,.86)); border: 1px solid rgba(70,139,223,.18); box-shadow: var(--shadow); overflow: hidden; }
.product-visual:before { content: ""; position: absolute; width: 210px; height: 210px; border-radius: 50%; background: rgba(70,139,223,.18); right: -48px; top: -48px; }
.app-shot { width: min(280px, 72vw); margin: 12px auto; border-radius: 34px; filter: drop-shadow(0 28px 38px rgba(44,87,145,.18)); position: relative; z-index: 2; }
.status-card, .asset-card, .risk-card, .backup-card { position: relative; z-index: 3; border: 1px solid rgba(219,232,247,.9); background: rgba(255,255,255,.9); border-radius: 18px; padding: 14px 16px; box-shadow: 0 14px 30px rgba(50,100,160,.1); }
.status-card { margin-bottom: 10px; }
.asset-card { max-width: 220px; margin: -34px 0 0 auto; }
.risk-card { max-width: 230px; margin: 12px auto 0 0; }
.backup-card { max-width: 250px; margin: 12px auto 0; }
.status-line { display: flex; justify-content: space-between; gap: 16px; color: var(--muted); font-size: .92rem; }
.status-line strong { color: var(--primary-dark); }
.download-btn { display: inline-flex; justify-content: center; align-items: center; min-height: 48px; padding: 13px 24px; background: var(--primary); color: #fff; border-radius: 999px; font-weight: 800; letter-spacing: .02em; box-shadow: 0 14px 28px rgba(70,139,223,.26); border: 1px solid rgba(255,255,255,.35); }
.download-btn:hover { background: var(--primary-dark); transform: translateY(-1px); }
.overview-strip { display: grid; gap: 14px; }
.metric-card { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 20px; box-shadow: 0 10px 26px rgba(54,101,160,.08); }
.metric-card strong { display: block; font-size: 1.05rem; }
.path-steps, .steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding: 22px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); box-shadow: 0 10px 30px rgba(54,101,160,.08); }
.step-card:before { counter-increment: step; content: "0" counter(step); display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 14px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 900; margin-bottom: 14px; }
.step-card a, .category-card a, .scenario-card a, .chapter-link, .text-link { color: var(--primary-dark); font-weight: 800; display: inline-block; margin-top: 12px; }
.category-nav, .category-grid { display: grid; gap: 14px; }
.category-card { background: linear-gradient(180deg, #fff, #f6fbff); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; min-height: 170px; transition: transform .2s ease, box-shadow .2s ease; }
.category-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.category-card .num { color: var(--primary); font-weight: 900; letter-spacing: .08em; font-size: .8rem; }
.feature-grid { display: grid; gap: 16px; }
.feature-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: 0 10px 30px rgba(54,101,160,.08); }
.feature-card .icon { width: 42px; height: 42px; border-radius: 15px; background: var(--primary-soft); color: var(--primary-dark); display: grid; place-items: center; font-weight: 900; margin-bottom: 16px; }
.security-layout, .split-section { display: grid; gap: 24px; align-items: center; }
.security-panel, .risk-panel { background: linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.88)); border: 1px solid rgba(70,139,223,.18); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.security-list, .check-list { display: grid; gap: 12px; padding: 0; margin: 18px 0 0; list-style: none; }
.security-list li, .check-list li { background: rgba(255,255,255,.78); border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; color: #40536a; }
.scenario-story-grid, .scenario-grid { display: grid; gap: 16px; }
.scenario-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: 0 10px 30px rgba(54,101,160,.08); }
.faq-list { display: grid; gap: 14px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 20px; }
.faq-item h3 { font-size: 1.05rem; }
.cta-section { text-align: center; background: linear-gradient(135deg, rgba(70,139,223,.16), rgba(255,255,255,.95)); border: 1px solid rgba(70,139,223,.18); border-radius: 30px; padding: 38px 22px; box-shadow: var(--shadow); }
.cta-section p { margin-left: auto; margin-right: auto; max-width: 680px; }
.page-hero { padding: 54px 0 28px; }
.page-hero-inner { display: grid; gap: 22px; }
.page-summary { font-size: 1.05rem; max-width: 780px; }
.article-layout { display: grid; gap: 24px; align-items: start; }
.article-card { background: #fff; border: 1px solid var(--line); border-radius: 26px; padding: 24px; box-shadow: 0 14px 34px rgba(54,101,160,.08); }
.article-card h2 { font-size: 1.55rem; margin-top: 8px; }
.article-card + .article-card { margin-top: 18px; }
.side-panel { background: linear-gradient(180deg, #f4faff, #fff); border: 1px solid var(--line); border-radius: 24px; padding: 22px; position: sticky; top: 92px; }
.note-box { background: var(--primary-soft); border: 1px solid rgba(70,139,223,.22); border-radius: 20px; padding: 18px; margin-top: 18px; }
.info-row { display: grid; gap: 14px; margin-top: 20px; }
.info-panel { padding: 18px; border-radius: 20px; border: 1px solid var(--line); background: rgba(255,255,255,.88); }
.story-timeline { position: relative; display: grid; gap: 16px; }
.timeline-item { display: grid; gap: 12px; padding: 22px; background: #fff; border: 1px solid var(--line); border-radius: 22px; box-shadow: 0 10px 28px rgba(54,101,160,.08); }
.timeline-num { color: var(--primary); font-size: .85rem; font-weight: 900; letter-spacing: .12em; }
.brand-statement { background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 34px 24px; box-shadow: var(--shadow); }
.brand-statement .quote { color: var(--ink); font-size: clamp(1.5rem, 5vw, 3rem); line-height: 1.25; font-weight: 900; letter-spacing: -.04em; margin: 12px 0; }
.chapter-index { display: grid; gap: 24px; align-items: start; }
.chapter-list { display: grid; gap: 10px; }
.chapter-item { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 18px; }
.chapter-item .num { color: var(--primary); font-weight: 900; }
.site-footer { margin-top: 40px; padding: 42px 0 22px; background: #eef7ff; border-top: 1px solid var(--line); }
.footer-grid { display: grid; gap: 24px; }
.footer-grid h3 { font-size: 1rem; margin-bottom: 8px; }
.footer-grid a { display: block; color: #4c6077; margin-top: 7px; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand img { width: 34px; border-radius: 10px; }
.footer-bottom { margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
@media (min-width: 700px) {
    .overview-strip { grid-template-columns: repeat(2, 1fr); }
    .category-grid, .category-nav { grid-template-columns: repeat(2, 1fr); }
    .feature-grid, .scenario-grid, .scenario-story-grid, .info-row { grid-template-columns: repeat(2, 1fr); }
    .path-steps, .steps { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
}
@media (min-width: 980px) {
    .nav-toggle-label { display: none; }
    .main-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .main-nav a { padding: 9px 11px; }
    .hero-banner { padding: 76px 0 50px; }
    .hero-layout { grid-template-columns: 1.05fr .95fr; gap: 54px; }
    .overview-strip { grid-template-columns: repeat(4, 1fr); }
    .category-grid { grid-template-columns: repeat(4, 1fr); }
    .feature-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .path-steps { grid-template-columns: repeat(3, 1fr); }
    .security-layout, .split-section { grid-template-columns: .95fr 1.05fr; gap: 42px; }
    .article-layout { grid-template-columns: minmax(0, 1fr) 310px; }
    .article-card { padding: 34px; }
    .page-hero { padding: 74px 0 34px; }
    .chapter-index { grid-template-columns: .78fr 1.22fr; }
    .story-timeline { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .timeline-item:nth-child(even) { transform: translateY(28px); }
    .scenario-story-grid { grid-template-columns: 1.2fr .8fr 1fr; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 26px, 1120px); }
    .product-visual { min-height: 390px; padding: 18px; }
    .download-btn { width: 100%; }
    .hero-actions { width: 100%; }
}