:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(38,93,168);
    --primary-soft: rgba(70,139,223,.10);
    --ink: #112033;
    --muted: #607083;
    --line: #dbe8f7;
    --card: #ffffff;
    --soft-bg: #f6f9fe;
    --shadow: 0 18px 45px rgba(38, 82, 145, .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:
        radial-gradient(circle at 15% 0%, rgba(70,139,223,.14), transparent 32rem),
        linear-gradient(180deg, #ffffff 0%, #f7fbff 48%, #ffffff 100%);
    line-height: 1.75;
    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: 30;
    background: rgba(255,255,255,.84);
    border-bottom: 1px solid rgba(219,232,247,.78);
    backdrop-filter: blur(16px);
}
.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: .01em;
    color: #10243b;
}
.logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(70,139,223,.18);
}
.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 70px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.site-nav a {
    display: block;
    padding: 10px 12px;
    color: #35516d;
    font-size: 14px;
    border-radius: 12px;
}
.site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.nav-toggle { display: none; }
.nav-toggle-label {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: grid;
    place-content: center;
    gap: 5px;
    background: #fff;
}
.nav-toggle-label span {
    width: 18px;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
}
.nav-toggle:checked ~ .site-nav { display: block; }

.section { padding: 58px 0; }
.section-tight { padding: 36px 0; }
.section-head {
    max-width: 720px;
    margin-bottom: 26px;
}
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}
h1, h2, h3 { line-height: 1.18; margin: 0 0 14px; color: #0e2035; }
h1 { font-size: clamp(34px, 8vw, 64px); letter-spacing: -.04em; }
h2 { font-size: clamp(26px, 5vw, 42px); letter-spacing: -.025em; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.hero {
    padding: 46px 0 70px;
}
.hero-layout {
    display: grid;
    gap: 32px;
    align-items: center;
}
.hero-copy {
    padding-top: 18px;
}
.hero-copy p {
    font-size: 17px;
    max-width: 650px;
}
.hero-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    margin: 26px 0 18px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(70,139,223,.24);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    cursor: pointer;
    border: 0;
    white-space: nowrap;
}
.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 18px 36px rgba(70,139,223,.28);
}
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.tag-row span,
.soft-tag {
    display: inline-flex;
    padding: 7px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255,255,255,.78);
    color: #456176;
    font-size: 13px;
    font-weight: 700;
}
.hero-visual {
    position: relative;
    border: 1px solid rgba(219,232,247,.88);
    border-radius: 30px;
    padding: 20px;
    background:
        linear-gradient(145deg, rgba(255,255,255,.96), rgba(235,245,255,.82)),
        radial-gradient(circle at 70% 20%, rgba(70,139,223,.16), transparent 18rem);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.app-panel {
    display: grid;
    gap: 16px;
}
.app-card {
    border: 1px solid var(--line);
    border-radius: 26px;
    background: #fff;
    padding: 18px;
    box-shadow: 0 14px 32px rgba(19,65,130,.08);
}
.app-card img {
    width: min(280px, 76vw);
    margin: 0 auto;
    border-radius: 24px;
}
.status-stack {
    display: grid;
    gap: 12px;
}
.status-card {
    padding: 14px;
    border-radius: 18px;
    background: rgba(255,255,255,.88);
    border: 1px solid var(--line);
}
.status-card strong { display: block; color: #10243b; }
.status-card span { display: block; color: var(--muted); font-size: 13px; }
.status-dot {
    width: 10px;
    height: 10px;
    display: inline-block;
    margin-right: 7px;
    border-radius: 99px;
    background: var(--primary);
    box-shadow: 0 0 0 6px rgba(70,139,223,.13);
}
.stats-bar {
    display: grid;
    gap: 14px;
}
.stat-card,
.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 12px 30px rgba(38,82,145,.06);
}
.stat-card strong {
    display: block;
    color: #10243b;
    font-size: 18px;
    margin-bottom: 5px;
}
.stat-card span { color: var(--muted); font-size: 14px; }
.category-nav {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding: 4px 0 12px;
}
.category-nav a {
    flex: 0 0 auto;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 9px 14px;
    background: #fff;
    color: #446176;
    font-weight: 700;
    font-size: 14px;
}
.category-grid,
.feature-grid,
.scenario-grid,
.recommend-grid {
    display: grid;
    gap: 16px;
}
.category-card,
.feature-card,
.scenario-card,
.faq-item,
.step-card,
.tip-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 12px 30px rgba(38,82,145,.06);
}
.category-card {
    min-height: 164px;
    display: flex;
    flex-direction: column;
}
.category-card a,
.card-link {
    margin-top: auto;
    color: var(--primary-dark);
    font-weight: 800;
}
.feature-card.primary {
    background: linear-gradient(145deg, rgba(70,139,223,.12), #fff 68%);
}
.icon-box {
    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: 14px;
}
.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: 20px;
    top: 22px;
    width: 30px;
    height: 30px;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 900;
}
.security-layout {
    display: grid;
    gap: 22px;
    align-items: start;
}
.security-panel {
    border-radius: 28px;
    border: 1px solid var(--line);
    background: linear-gradient(160deg, #fff, #eef6ff);
    padding: 24px;
    box-shadow: var(--shadow);
}
.principle-list {
    display: grid;
    gap: 12px;
    padding: 0;
    margin: 0;
    list-style: none;
}
.principle-list li {
    padding: 14px;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,.8);
    color: #365069;
}
.process-steps {
    display: grid;
    gap: 16px;
}
.process-step {
    border-left: 3px solid var(--primary);
    padding: 10px 0 10px 18px;
}
.faq-list {
    display: grid;
    gap: 14px;
}
.faq-item h3 { font-size: 18px; }
.cta-section {
    text-align: center;
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 34px 22px;
    background:
        radial-gradient(circle at 20% 20%, rgba(70,139,223,.16), transparent 16rem),
        linear-gradient(145deg, #ffffff, #eff7ff);
    box-shadow: var(--shadow);
}
.page-hero {
    padding: 52px 0 32px;
}
.page-hero-inner {
    max-width: 820px;
}
.doc-layout {
    display: grid;
    gap: 22px;
    align-items: start;
}
.doc-main {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}
.doc-main h2 { font-size: 26px; margin-top: 30px; }
.doc-main ul,
.doc-main ol {
    color: #51667b;
    padding-left: 22px;
}
.doc-main li { margin: 8px 0; }
.doc-side {
    display: grid;
    gap: 14px;
}
.note {
    border-radius: 20px;
    border: 1px solid var(--line);
    background: #f7fbff;
    padding: 18px;
}
.check-list {
    display: grid;
    gap: 12px;
    margin: 18px 0;
}
.check-item {
    padding: 14px;
    border-radius: 16px;
    border: 1px solid var(--line);
    background: #fbfdff;
}
.download-zone {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--line);
}
.site-footer {
    margin-top: 50px;
    background: #0f2338;
    color: #d9e7f8;
    padding: 44px 0 20px;
}
.footer-grid {
    display: grid;
    gap: 24px;
}
.footer-brand {
    font-weight: 900;
    font-size: 22px;
    margin-bottom: 10px;
    color: #fff;
}
.site-footer p { color: #b8cbe2; }
.site-footer h3 {
    color: #fff;
    font-size: 16px;
}
.site-footer a {
    display: block;
    color: #c6d7eb;
    padding: 5px 0;
    font-size: 14px;
}
.footer-bottom {
    margin-top: 30px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.12);
    color: #9cb2c9;
    font-size: 13px;
}
@media (min-width: 640px) {
    .stats-bar { grid-template-columns: repeat(2, 1fr); }
    .category-grid, .scenario-grid, .recommend-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 920px) {
    .nav-toggle-label { display: none; }
    .site-nav {
        display: flex;
        position: static;
        padding: 0;
        background: transparent;
        border: 0;
        box-shadow: none;
        gap: 4px;
        align-items: center;
    }
    .site-nav a { padding: 8px 12px; }
    .hero { padding: 70px 0 88px; }
    .hero-layout { grid-template-columns: 1.02fr .98fr; gap: 52px; }
    .app-panel { grid-template-columns: 1.2fr .8fr; align-items: center; }
    .stats-bar { grid-template-columns: repeat(4, 1fr); }
    .category-grid { grid-template-columns: repeat(3, 1fr); }
    .category-card.wide { grid-column: span 2; }
    .feature-grid { grid-template-columns: repeat(3, 1fr); }
    .feature-card.wide { grid-column: span 2; }
    .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .steps { grid-template-columns: repeat(3, 1fr); }
    .security-layout { grid-template-columns: 1fr .88fr; gap: 40px; }
    .doc-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .doc-main { padding: 34px; }
    .footer-grid { grid-template-columns: 1.6fr .7fr .7fr; }
}
@media (min-width: 1120px) {
    .feature-card.tall { min-height: 270px; }
    .hero-visual { transform: translateY(10px); }
}