:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1d5fab;
    --primary-soft: #eaf4ff;
    --primary-soft-2: #f3f8ff;
    --ink: #102033;
    --muted: #607089;
    --line: #dbe8f7;
    --card: rgba(255, 255, 255, 0.88);
    --white: #ffffff;
    --radius-lg: 24px;
    --radius-md: 18px;
    --shadow: 0 18px 48px rgba(40, 95, 160, 0.12);
    --shadow-soft: 0 10px 28px rgba(40, 95, 160, 0.08);
}
* { 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, #f5faff 0%, #ffffff 38%, #f7fbff 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(255,255,255,0.9);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(219,232,247,0.86);
}
.nav-wrap { 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: -0.02em; color: #102946; }
.logo { width: 38px; height: 38px; border-radius: 12px; }
.site-nav { display: none; flex-direction: column; position: absolute; top: 70px; left: 16px; right: 16px; background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow-soft); border-radius: 18px; padding: 12px; }
.site-nav a { padding: 12px 14px; border-radius: 12px; color: #31445f; font-size: 15px; }
.site-nav a.active, .site-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label { display: flex; flex-direction: column; gap: 5px; width: 42px; height: 42px; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.nav-toggle-label span { width: 18px; height: 2px; background: var(--ink); border-radius: 8px; }
.nav-toggle:checked ~ .site-nav { display: flex; }
.hero {
    position: relative;
    padding: 42px 0 30px;
    background:
        radial-gradient(circle at 15% 5%, rgba(70,139,223,0.18), transparent 32%),
        radial-gradient(circle at 88% 18%, rgba(70,139,223,0.12), transparent 30%);
}
.hero-layout { display: grid; grid-template-columns: 1fr; gap: 28px; align-items: center; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: rgba(70,139,223,0.11);
    font-weight: 700;
    font-size: 13px;
}
h1, h2, h3 { line-height: 1.25; color: #11243a; margin-top: 0; }
h1 { font-size: clamp(32px, 8vw, 58px); letter-spacing: -0.055em; margin: 16px 0 16px; }
h2 { font-size: clamp(25px, 5vw, 38px); letter-spacing: -0.035em; margin-bottom: 12px; }
h3 { font-size: 20px; margin-bottom: 8px; }
p { color: var(--muted); margin: 0 0 14px; }
.lead { font-size: 17px; color: #41546d; max-width: 650px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; 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 26px rgba(70,139,223,0.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    border: 0;
    cursor: pointer;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 16px 34px rgba(70,139,223,0.32); }
.assurance { font-size: 13px; color: #667992; }
.hero-visual { position: relative; min-height: 420px; display: grid; place-items: center; }
.product-shell {
    width: min(360px, 88vw);
    border-radius: 34px;
    padding: 18px;
    background: linear-gradient(145deg, rgba(255,255,255,0.96), rgba(235,245,255,0.82));
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,0.8);
}
.product-shell img { border-radius: 28px; width: 100%; }
.floating-card {
    position: absolute;
    background: rgba(255,255,255,0.92);
    border: 1px solid rgba(219,232,247,0.9);
    border-radius: 18px;
    padding: 12px 14px;
    box-shadow: var(--shadow-soft);
    color: #23405e;
    font-size: 13px;
}
.floating-card strong { display: block; color: #11243a; font-size: 15px; }
.status-card { left: 2px; top: 46px; }
.key-card { right: 0; top: 90px; }
.verify-card { left: 8px; bottom: 82px; }
.protect-card { right: 10px; bottom: 28px; }
.section { padding: 48px 0; }
.section-soft { background: linear-gradient(180deg, rgba(235,245,255,0.58), rgba(255,255,255,0)); }
.section-head { max-width: 760px; margin-bottom: 24px; }
.center { text-align: center; margin-left: auto; margin-right: auto; }
.trust-grid, .feature-grid, .category-grid, .scenario-grid, .content-grid, .info-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.trust-item, .feature-card, .category-card, .scenario-card, .info-card, .tip-card, .faq-item, .step, .panel-card {
    background: var(--card);
    border: 1px solid rgba(219,232,247,0.92);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--shadow-soft);
}
.trust-item strong { display: block; font-size: 21px; color: #11243a; margin-bottom: 4px; }
.category-card { display: block; transition: transform .2s ease, border-color .2s ease; }
.category-card:hover { transform: translateY(-4px); border-color: rgba(70,139,223,0.45); }
.category-card .arrow { color: var(--primary-dark); font-weight: 800; margin-top: 12px; display: inline-flex; }
.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: 14px;
}
.security-layout, .split-layout { display: grid; grid-template-columns: 1fr; gap: 24px; align-items: center; }
.security-panel {
    background: linear-gradient(145deg, #ffffff, #eef7ff);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: var(--shadow);
}
.security-row { display: flex; justify-content: space-between; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.security-row:last-child { border-bottom: 0; }
.security-row span { color: var(--muted); }
.security-row strong { color: #163b64; text-align: right; }
.steps { display: grid; grid-template-columns: 1fr; gap: 16px; counter-reset: step; }
.step { position: relative; }
.step::before {
    counter-increment: step;
    content: counter(step);
    width: 32px; height: 32px; border-radius: 50%;
    display: grid; place-items: center;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    margin-bottom: 12px;
}
.cta-section {
    padding: 40px 22px;
    border-radius: var(--radius-lg);
    background:
        radial-gradient(circle at 10% 10%, rgba(70,139,223,0.18), transparent 26%),
        linear-gradient(135deg, #eef7ff, #ffffff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
    text-align: center;
}
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { font-size: 18px; margin-bottom: 8px; }
.page-hero { padding: 46px 0 18px; }
.page-hero .lead { max-width: 760px; }
.article-layout { display: grid; grid-template-columns: 1fr; gap: 24px; }
.article-card {
    background: rgba(255,255,255,0.88);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-soft);
}
.article-card h2 { font-size: 26px; }
.article-card ul, .article-card ol { color: var(--muted); padding-left: 20px; margin: 0 0 16px; }
.article-card li { margin: 8px 0; }
.side-panel { display: grid; gap: 14px; align-content: start; }
.note { border-left: 4px solid var(--primary); background: var(--primary-soft-2); padding: 16px; border-radius: 14px; color: #405775; }
.download-panel { margin-top: 22px; padding: 20px; border-radius: 20px; background: linear-gradient(135deg, #f0f7ff, #fff); border: 1px solid var(--line); }
.page-actions { margin-top: 22px; }
.site-footer { background: #f1f7ff; border-top: 1px solid var(--line); margin-top: 36px; padding-top: 36px; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer-logo { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h3 { font-size: 16px; margin-bottom: 10px; }
.site-footer a { display: block; color: #53667f; margin: 7px 0; }
.site-footer a:hover { color: var(--primary-dark); }
.footer-bottom { border-top: 1px solid var(--line); margin-top: 28px; padding: 18px 0; display: flex; flex-direction: column; gap: 8px; color: #6c7c92; font-size: 13px; }
.kv-list { display: grid; gap: 12px; }
.kv { display: flex; gap: 10px; align-items: flex-start; }
.kv b { min-width: 88px; color: #183858; }
.table-like { display: grid; gap: 10px; }
.table-like div { display: grid; gap: 6px; padding: 14px; background: #f7fbff; border: 1px solid var(--line); border-radius: 14px; }
.table-like strong { color: #153658; }
@media (min-width: 640px) {
    .trust-grid, .category-grid, .info-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .content-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
}
@media (min-width: 900px) {
    .nav-toggle-label { display: none; }
    .site-nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 4px; background: transparent; border: 0; box-shadow: none; padding: 0; }
    .site-nav a { padding: 9px 12px; }
    .hero { padding: 76px 0 54px; }
    .hero-layout { grid-template-columns: 1.03fr 0.97fr; gap: 44px; }
    .hero-visual { min-height: 520px; }
    .section { padding: 68px 0; }
    .feature-grid, .category-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .trust-grid { grid-template-columns: repeat(4, 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) 330px; align-items: start; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}
@media (max-width: 380px) {
    .container { width: min(100% - 24px, 1120px); }
    .floating-card { position: static; margin: 8px 0 0; width: 100%; }
    .hero-visual { display: block; min-height: auto; }
    .product-shell { margin: 0 auto 12px; }
}