:root {
    --primary: rgb(70,139,223);
    --primary-dark: #2f6fb7;
    --primary-soft: #eaf4ff;
    --primary-line: #cfe4ff;
    --ink: #14233b;
    --muted: #627087;
    --bg: #f6faff;
    --card: #ffffff;
    --panel: rgba(255,255,255,.86);
    --shadow: 0 16px 42px rgba(37, 91, 155, .11);
    --radius: 22px;
    --radius-sm: 16px;
    --max: 1180px;
}
* { 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(--ink);
    background:
        radial-gradient(circle at top left, rgba(70,139,223,.16), transparent 34rem),
        linear-gradient(180deg, #f8fbff 0%, #ffffff 38%, #f6faff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(100% - 32px, var(--max)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.9);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(207,228,255,.75);
}
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink); letter-spacing: .02em; }
.brand img { width: 38px; height: 38px; border-radius: 12px; box-shadow: 0 8px 18px rgba(70,139,223,.18); }
.site-nav { display: none; width: 100%; padding: 10px 0 18px; flex-direction: column; gap: 8px; }
.site-nav a { padding: 10px 12px; color: var(--muted); border-radius: 12px; font-size: 15px; }
.site-nav a:hover, .site-nav a.active { color: var(--primary-dark); background: var(--primary-soft); }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label { width: 42px; height: 42px; display: grid; place-content: center; gap: 5px; border: 1px solid var(--primary-line); border-radius: 14px; background: #fff; }
.nav-toggle-label span { display: block; width: 18px; height: 2px; background: var(--primary-dark); border-radius: 3px; }
.nav-toggle:checked ~ .site-nav { display: flex; position: absolute; left: 16px; right: 16px; top: 72px; width: auto; background: #fff; border: 1px solid var(--primary-line); border-radius: 18px; box-shadow: var(--shadow); padding: 12px; }
.section { padding: 54px 0; }
.section-tight { padding: 36px 0; }
.section-head { max-width: 760px; margin-bottom: 24px; }
.eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    background: var(--primary-soft);
    border: 1px solid var(--primary-line);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
}
h1, h2, h3 { line-height: 1.22; margin: 0 0 12px; color: var(--ink); }
h1 { font-size: clamp(32px, 7vw, 58px); letter-spacing: -.04em; }
h2 { font-size: clamp(26px, 4vw, 38px); letter-spacing: -.03em; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.hero { padding: 42px 0 64px; }
.hero-layout { display: grid; gap: 28px; align-items: center; }
.hero-copy { position: relative; z-index: 2; }
.hero-copy p { font-size: 17px; max-width: 660px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; margin: 24px 0; }
.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;
    box-shadow: 0 14px 28px rgba(70,139,223,.25);
    border: 0;
    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,.3); }
.text-link { color: var(--primary-dark); font-weight: 700; }
.badge-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.badge-row span, .soft-tag {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.82);
    border: 1px solid var(--primary-line);
    color: #35506e;
    font-size: 13px;
    font-weight: 700;
}
.hero-visual { position: relative; min-height: 420px; }
.visual-shell {
    position: relative;
    min-height: 420px;
    border-radius: 30px;
    background:
        linear-gradient(145deg, rgba(70,139,223,.17), rgba(255,255,255,.86)),
        radial-gradient(circle at 70% 18%, rgba(70,139,223,.2), transparent 16rem);
    border: 1px solid rgba(207,228,255,.9);
    box-shadow: var(--shadow);
    overflow: hidden;
    padding: 22px;
}
.app-shot { width: min(78%, 300px); margin: 0 auto; filter: drop-shadow(0 24px 28px rgba(30,72,126,.16)); border-radius: 28px; }
.float-card, .asset-card, .risk-card {
    position: absolute;
    background: rgba(255,255,255,.92);
    border: 1px solid rgba(207,228,255,.9);
    border-radius: 18px;
    box-shadow: 0 14px 30px rgba(35,77,130,.12);
    padding: 14px;
}
.float-card { left: 16px; top: 18px; max-width: 220px; }
.asset-card { right: 16px; top: 46%; width: 190px; }
.risk-card { left: 20px; bottom: 22px; max-width: 238px; }
.status-dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; background: #34b27b; margin-right: 6px; }
.asset-line { display: flex; justify-content: space-between; gap: 10px; color: var(--muted); font-size: 13px; border-top: 1px solid #edf4ff; padding-top: 8px; margin-top: 8px; }
.stat-strip { display: grid; gap: 14px; }
.stat-item, .card, .category-card, .feature-card, .scenario-card, .faq-item, .note-card, .step-card {
    background: var(--card);
    border: 1px solid rgba(207,228,255,.88);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.stat-item { padding: 18px; }
.stat-item strong { display: block; color: var(--primary-dark); font-size: 22px; margin-bottom: 4px; }
.card { padding: 22px; }
.grid, .feature-grid, .category-grid, .scenario-grid, .recommend-grid { display: grid; gap: 16px; }
.category-card, .feature-card, .scenario-card, .step-card { padding: 20px; }
.category-card { min-height: 168px; transition: transform .2s ease, border-color .2s ease; }
.category-card:hover, .step-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.5); }
.category-card .meta, .step-card .meta { color: var(--primary-dark); font-size: 13px; font-weight: 800; margin-bottom: 10px; }
.category-card a, .step-card a, .recommend-card a { color: var(--primary-dark); font-weight: 800; }
.feature-card .icon, .category-card .icon, .scenario-card .icon {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 12px;
}
.security-layout { display: grid; gap: 22px; align-items: center; }
.security-panel {
    padding: 22px;
    border-radius: 28px;
    background: linear-gradient(145deg, rgba(255,255,255,.95), rgba(234,244,255,.9));
    border: 1px solid var(--primary-line);
    box-shadow: var(--shadow);
}
.security-row { display: flex; justify-content: space-between; gap: 14px; padding: 12px 0; border-bottom: 1px solid #e8f2ff; color: var(--muted); }
.security-row:last-child { border-bottom: 0; }
.security-row strong { color: var(--ink); }
.steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; padding-left: 64px; }
.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 18px;
    top: 20px;
    width: 32px;
    height: 32px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}
.article-hero { padding: 46px 0 26px; }
.article-layout { display: grid; gap: 22px; align-items: start; }
.article-body { background: rgba(255,255,255,.82); border: 1px solid var(--primary-line); border-radius: 28px; box-shadow: var(--shadow); padding: 24px; }
.article-body p { font-size: 16px; }
.info-list { display: grid; gap: 12px; padding: 0; list-style: none; margin: 16px 0 0; }
.info-list li {
    padding: 14px 16px;
    border-radius: 16px;
    background: #f4f9ff;
    border: 1px solid #dbeeff;
    color: #425571;
}
.split-list { display: grid; gap: 14px; }
.alert-box { border-left: 4px solid var(--primary); background: #f3f8ff; border-radius: 18px; padding: 16px; color: #486078; }
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 18px; }
.faq-item h3 { font-size: 18px; }
.cta-section {
    text-align: center;
    padding: 44px 24px;
    border-radius: 30px;
    background: linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.95));
    border: 1px solid var(--primary-line);
    box-shadow: var(--shadow);
}
.cta-section p { max-width: 680px; margin-left: auto; margin-right: auto; }
.site-footer { margin-top: 42px; padding: 42px 0 22px; background: #0f223b; color: #dbe8f8; }
.site-footer p, .site-footer a { color: #b9cce4; }
.footer-grid { display: grid; gap: 24px; }
.footer-grid a { display: block; margin: 8px 0; }
.footer-grid h3 { color: #fff; font-size: 16px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; margin-bottom: 12px; }
.footer-brand img { width: 36px; height: 36px; border-radius: 12px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 24px; padding-top: 18px; color: #9fb5ce; font-size: 13px; }
@media (min-width: 640px) {
    .stat-strip { grid-template-columns: repeat(2, 1fr); }
    .category-grid, .feature-grid, .scenario-grid, .recommend-grid { grid-template-columns: repeat(2, 1fr); }
    .split-list { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
    .nav-toggle-label { display: none; }
    .site-nav { display: flex; width: auto; flex-direction: row; padding: 0; gap: 4px; align-items: center; }
    .site-nav a { padding: 9px 12px; }
    .hero { padding-top: 72px; }
    .hero-layout { grid-template-columns: minmax(0, 1.02fr) minmax(360px, .98fr); gap: 44px; }
    .security-layout { grid-template-columns: 1fr 1fr; }
    .article-layout { grid-template-columns: minmax(0, 1fr) 330px; }
    .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); }
    .stat-strip { grid-template-columns: repeat(4, 1fr); }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
    .article-body { padding: 34px; }
}
@media (min-width: 1120px) {
    .site-nav a { padding: 10px 15px; }
    .section { padding: 70px 0; }
}