:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(34,93,168);
    --primary-soft: rgba(70,139,223,.12);
    --text: #102033;
    --muted: #5f6f83;
    --line: #dbe8f7;
    --card: rgba(255,255,255,.86);
    --bg: #f5f9ff;
    --shadow: 0 18px 50px rgba(47, 102, 173, .12);
    --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    background: linear-gradient(180deg, #eef6ff 0%, #ffffff 42%, #f6faff 100%);
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; 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,.82);
    border-bottom: 1px solid rgba(205,224,246,.72);
    backdrop-filter: blur(16px);
}
.header-inner {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    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: .2px; }
.logo-img { width: 38px; height: 38px; border-radius: 12px; }
.brand-text { font-size: 18px; color: #12345a; }
.nav-toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 14px;
    cursor: pointer;
}
.nav-toggle span { width: 18px; height: 2px; background: #24527e; margin: 0 auto; border-radius: 999px; }
.site-nav {
    position: absolute;
    top: 70px;
    left: 14px;
    right: 14px;
    display: none;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.site-nav.is-open { display: grid; gap: 8px; }
.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #35516f;
    font-weight: 600;
}
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.section { padding: 58px 0; }
.section-tight { padding: 38px 0; }
.section-title { margin: 0 0 12px; font-size: clamp(26px, 4vw, 42px); line-height: 1.18; letter-spacing: -0.02em; }
.section-lead { margin: 0 auto 28px; color: var(--muted); max-width: 720px; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 13px;
}
.hero {
    padding: 48px 0 38px;
    background:
        radial-gradient(circle at 12% 4%, rgba(70,139,223,.18), transparent 34%),
        radial-gradient(circle at 88% 22%, rgba(87,179,255,.20), transparent 36%);
}
.hero-layout { display: grid; gap: 32px; align-items: center; }
.hero-copy h1 { margin: 18px 0 16px; font-size: clamp(34px, 9vw, 64px); line-height: 1.05; letter-spacing: -0.045em; }
.hero-copy p { margin: 0 0 22px; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.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 14px 28px rgba(70,139,223,.28);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
    border: 0;
    cursor: pointer;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 32px rgba(70,139,223,.32); }
.hero-note { color: #6c7d91; font-size: 14px; }
.hero-visual {
    position: relative;
    min-height: 480px;
    display: grid;
    place-items: center;
}
.product-shell {
    width: min(410px, 92vw);
    padding: 16px;
    border-radius: 34px;
    background: linear-gradient(145deg, rgba(255,255,255,.86), rgba(232,243,255,.68));
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,.9);
}
.product-shell img { border-radius: 28px; margin: auto; }
.float-card, .status-card {
    position: absolute;
    background: rgba(255,255,255,.88);
    border: 1px solid rgba(214,229,248,.85);
    box-shadow: 0 16px 38px rgba(34, 91, 155, .13);
    border-radius: 18px;
    backdrop-filter: blur(14px);
}
.status-card {
    left: 0;
    top: 34px;
    width: 208px;
    padding: 16px;
}
.status-card strong { display: block; font-size: 15px; }
.status-card span { color: #62809e; font-size: 13px; }
.status-line { display: flex; justify-content: space-between; margin-top: 12px; color: var(--primary-dark); font-weight: 800; }
.float-card { padding: 10px 13px; color: #315174; font-size: 13px; font-weight: 700; }
.float-one { right: 4px; top: 78px; }
.float-two { left: 12px; bottom: 118px; }
.float-three { right: 6px; bottom: 42px; }
.trust-strip { display: grid; grid-template-columns: 1fr; gap: 14px; }
.trust-item {
    padding: 18px;
    border-radius: 18px;
    background: var(--card);
    border: 1px solid rgba(213,229,247,.8);
    box-shadow: 0 10px 24px rgba(42,91,153,.07);
}
.trust-item strong { display: block; margin-bottom: 4px; }
.trust-item span { color: var(--muted); font-size: 14px; }
.category-grid, .feature-grid, .scenario-grid, .article-grid, .info-grid {
    display: grid;
    gap: 16px;
}
.category-card, .feature-card, .scenario-card, .article-card, .faq-item, .tip-card, .content-card, .step, .download-panel {
    border: 1px solid rgba(213,229,247,.82);
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: 0 12px 28px rgba(42,91,153,.07);
}
.category-card, .feature-card, .scenario-card, .article-card, .tip-card, .content-card { padding: 22px; }
.category-card { display: block; transition: transform .18s ease, border-color .18s ease; }
.category-card:hover { transform: translateY(-4px); border-color: rgba(70,139,223,.42); }
.category-card h3, .feature-card h3, .scenario-card h3, .article-card h3 { margin: 0 0 8px; font-size: 20px; }
.category-card p, .feature-card p, .scenario-card p, .article-card p, .content-card p { color: var(--muted); margin: 0; }
.link-arrow { margin-top: 14px; display: inline-block; color: var(--primary-dark); font-weight: 800; }
.security-layout, .split-layout { display: grid; gap: 24px; align-items: center; }
.security-panel { padding: 24px; border-radius: 28px; background: linear-gradient(145deg, #ffffff, #eaf4ff); border: 1px solid rgba(213,229,247,.9); box-shadow: var(--shadow); }
.security-row { display: flex; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.security-row:last-child { border-bottom: 0; }
.check-dot { flex: 0 0 26px; height: 26px; border-radius: 50%; background: var(--primary); color: #fff; display: grid; place-items: center; font-size: 14px; font-weight: 900; }
.steps { display: grid; gap: 16px; counter-reset: step; }
.step { padding: 22px; position: relative; overflow: hidden; }
.step:before { counter-increment: step; content: counter(step); display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 12px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 900; margin-bottom: 12px; }
.step h3 { margin: 0 0 8px; }
.step p { margin: 0; color: var(--muted); }
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 20px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section { padding: 64px 0; }
.download-panel { padding: 34px 22px; text-align: center; background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.92)); }
.download-panel p { color: var(--muted); max-width: 660px; margin: 10px auto 22px; }
.page-hero { padding: 54px 0 34px; background: radial-gradient(circle at 15% 5%, rgba(70,139,223,.18), transparent 32%); }
.page-hero h1 { margin: 14px 0 12px; font-size: clamp(30px, 7vw, 50px); line-height: 1.12; }
.page-hero p { color: var(--muted); max-width: 760px; margin: 0; }
.article-layout { display: grid; gap: 24px; align-items: start; }
.article-main { display: grid; gap: 18px; }
.content-card h2 { margin-top: 0; }
.content-card ul, .content-card ol { margin: 12px 0 0; padding-left: 22px; color: var(--muted); }
.tip-card { background: linear-gradient(145deg, #fff, #eef7ff); }
.tip-card h3 { margin-top: 0; }
.tip-card ul { margin: 0; padding-left: 20px; color: var(--muted); }
.callout {
    padding: 16px 18px;
    border-left: 4px solid var(--primary);
    background: rgba(70,139,223,.08);
    border-radius: 14px;
    color: #34536f;
}
.timeline { display: grid; gap: 14px; }
.timeline-item { display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; }
.timeline-num { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 12px; background: var(--primary); color: #fff; font-weight: 900; }
.notice-list { display: grid; gap: 12px; }
.notice-list div { padding: 14px 16px; border-radius: 16px; background: #f4f9ff; border: 1px solid var(--line); }
.site-footer { margin-top: 40px; padding: 44px 0 0; background: #0f2740; color: #dbeaff; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { color: #fff; font-size: 22px; font-weight: 900; margin-bottom: 10px; }
.site-footer p { color: #acc4dc; margin: 0; }
.site-footer h3 { color: #fff; margin: 0 0 10px; font-size: 16px; }
.site-footer a { display: block; color: #bdd4ea; padding: 3px 0; font-size: 14px; }
.footer-bottom { margin-top: 34px; padding: 18px; text-align: center; border-top: 1px solid rgba(255,255,255,.12); color: #9fb9d4; font-size: 14px; }
.center { text-align: center; }
@media (min-width: 640px) {
    .trust-strip { grid-template-columns: repeat(2, 1fr); }
    .category-grid, .feature-grid, .scenario-grid, .article-grid, .info-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; background: transparent; border: 0; box-shadow: none; }
    .site-nav a { font-size: 14px; }
    .hero { padding: 76px 0 62px; }
    .hero-layout { grid-template-columns: 1.02fr .98fr; gap: 56px; }
    .hero-copy p { font-size: 18px; max-width: 600px; }
    .trust-strip { grid-template-columns: repeat(4, 1fr); }
    .category-grid, .feature-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .article-grid, .info-grid { grid-template-columns: repeat(3, 1fr); }
    .security-layout, .split-layout { grid-template-columns: 1fr 1fr; gap: 44px; }
    .steps { grid-template-columns: repeat(4, 1fr); }
    .article-layout { grid-template-columns: minmax(0, 1fr) 320px; gap: 28px; }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
}
@media (max-width: 520px) {
    .container { width: min(100% - 24px, 1120px); }
    .hero-visual { min-height: 430px; }
    .status-card { left: 0; top: 18px; width: 182px; }
    .float-one { right: 0; top: 86px; }
    .float-two { left: 0; bottom: 90px; }
    .float-three { right: 0; bottom: 22px; }
    .download-btn { width: 100%; }
    .hero-note { width: 100%; text-align: center; }
}