:root {
    --primary: rgb(70,139,223);
    --primary-dark: #235fba;
    --primary-soft: #eef6ff;
    --primary-lighter: #f6fbff;
    --text: #17233c;
    --muted: #5d6b82;
    --line: #dbe7f5;
    --card: #ffffff;
    --bg: #f7fbff;
    --shadow: 0 16px 36px rgba(31, 77, 126, 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(--text);
    background: linear-gradient(180deg, #f5faff 0%, #ffffff 40%, #f8fbff 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% - 32px)); margin: 0 auto; }
.section { padding: 52px 0; }
.section-title { margin: 0 0 18px; font-size: clamp(24px, 4vw, 36px); line-height: 1.25; letter-spacing: -0.02em; }
.section-kicker, .doc-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: var(--primary-soft);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 14px;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(219, 231, 245, 0.9);
}
.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.02em; }
.logo img { width: 40px; height: 40px; border-radius: 12px; }
.nav-toggle {
    display: inline-flex;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--text);
    border-radius: 12px;
    padding: 8px 11px;
    font-size: 18px;
}
.main-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.main-nav.is-open { display: flex; }
.main-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: var(--muted);
    font-weight: 650;
    font-size: 14px;
}
.main-nav a:hover, .main-nav a.active { color: var(--primary-dark); background: var(--primary-soft); }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 14px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 10px 24px rgba(70,139,223,0.24);
    transition: transform .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-1px); background: var(--primary-dark); }
.docs-hero { padding: 48px 0 28px; }
.docs-hero-grid { display: grid; grid-template-columns: 1fr; gap: 28px; align-items: center; }
.hero-copy h1 { font-size: clamp(32px, 7vw, 56px); line-height: 1.12; margin: 10px 0 18px; letter-spacing: -0.04em; }
.hero-copy p { color: var(--muted); font-size: 17px; max-width: 680px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 26px; }
.hero-tags span, .mini-tag {
    border: 1px solid var(--line);
    color: #2d5d96;
    background: rgba(255,255,255,.75);
    border-radius: 999px;
    padding: 7px 12px;
    font-size: 13px;
    font-weight: 700;
}
.hero-device-panel {
    background: linear-gradient(155deg, #ffffff 0%, #eef7ff 100%);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 20px;
    box-shadow: var(--shadow);
}
.app-showcase { display: grid; grid-template-columns: 1fr; gap: 14px; align-items: center; }
.app-frame { padding: 18px; border-radius: 24px; background: #fff; border: 1px solid var(--line); }
.status-cards { display: grid; gap: 12px; }
.status-card { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 14px; }
.status-card strong { display: block; color: var(--primary-dark); margin-bottom: 4px; }
.safety-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: stretch;
    padding: 14px;
    margin: 18px auto 24px;
    border: 1px solid #cfe3fb;
    border-radius: 18px;
    background: #edf7ff;
}
.safety-strip span {
    flex: 1 1 220px;
    padding: 8px 10px;
    border-radius: 12px;
    color: #24476d;
    background: rgba(255,255,255,.65);
    font-size: 14px;
}
.docs-layout { display: grid; grid-template-columns: 1fr; gap: 22px; align-items: start; }
.docs-sidebar {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 16px;
    box-shadow: var(--shadow);
}
.docs-sidebar h2 { margin: 0 0 10px; font-size: 16px; }
.docs-sidebar nav { display: grid; grid-template-columns: 1fr; gap: 8px; }
.docs-sidebar a { padding: 10px 12px; border-radius: 12px; color: var(--muted); background: var(--primary-lighter); font-size: 14px; }
.docs-sidebar a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.docs-content { display: grid; gap: 28px; }
.doc-panel, .security-panel, .content-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 22px;
    box-shadow: var(--shadow);
}
.doc-panel h2, .content-card h2 { margin-top: 0; font-size: clamp(22px, 3vw, 30px); }
.notice, .tip-box {
    border-left: 4px solid var(--primary);
    background: var(--primary-soft);
    color: #294766;
    border-radius: 14px;
    padding: 14px 16px;
    margin: 16px 0;
}
.docs-steps { display: grid; gap: 14px; counter-reset: step; }
.step-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 14px;
    padding: 16px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: #fff;
}
.step-number {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    color: #fff;
    font-weight: 800;
    background: var(--primary);
}
.step-item h3 { margin: 0 0 4px; font-size: 18px; }
.step-item p { margin: 0 0 8px; color: var(--muted); }
.text-link { color: var(--primary-dark); font-weight: 800; }
.docs-category-grid, .risk-grid, .feature-grid, .faq-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.category-card, .document-card, .risk-item, .faq-item, .feature-card {
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    padding: 18px;
}
.category-card h3, .risk-item h3, .feature-card h3, .faq-item h3 { margin: 0 0 8px; }
.category-card p, .risk-item p, .feature-card p, .faq-item p { margin: 0 0 10px; color: var(--muted); }
.principle-list { display: grid; gap: 12px; }
.principle-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 14px;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
}
.principle-item:last-child { border-bottom: 0; }
.principle-index {
    font-weight: 900;
    color: var(--primary);
    font-size: 20px;
}
.cta-section {
    text-align: center;
    background: linear-gradient(135deg, #eef7ff, #ffffff);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}
.cta-box { max-width: 760px; margin: 0 auto; }
.cta-box p { color: var(--muted); }
.page-hero { padding: 44px 0 22px; }
.page-hero-card {
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 24px;
    background: linear-gradient(135deg, #ffffff, #eef7ff);
    box-shadow: var(--shadow);
}
.page-hero h1 { margin: 0 0 12px; font-size: clamp(30px, 6vw, 46px); line-height: 1.18; }
.page-hero p { color: var(--muted); max-width: 780px; }
.doc-page-layout { display: grid; grid-template-columns: 1fr; gap: 22px; align-items: start; }
.article-body { max-width: 820px; }
.article-body p { color: #3d4a5f; }
.side-note {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 18px;
    box-shadow: var(--shadow);
}
.side-note h3 { margin-top: 0; }
.check-list, .simple-list { padding: 0; margin: 14px 0; list-style: none; display: grid; gap: 10px; }
.check-list li, .simple-list li {
    padding: 12px 14px;
    border-radius: 14px;
    background: var(--primary-lighter);
    border: 1px solid var(--line);
}
.download-flow { display: grid; gap: 14px; margin: 20px 0; }
.flow-row { padding: 16px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.about-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.site-footer { margin-top: 48px; padding: 38px 0 18px; background: #10233f; color: #dce8f7; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.footer-brand { font-size: 20px; font-weight: 900; color: #fff; margin-bottom: 8px; }
.site-footer h3 { color: #fff; margin: 0 0 10px; }
.site-footer a { display: block; color: #c5d5e8; margin: 7px 0; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.14); margin-top: 26px; padding-top: 16px; color: #aebed1; font-size: 13px; }

@media (min-width: 700px) {
    .docs-category-grid, .risk-grid, .feature-grid, .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .app-showcase { grid-template-columns: .9fr 1.1fr; }
    .footer-grid { grid-template-columns: 1.6fr 1fr 1fr; }
    .about-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 980px) {
    .nav-toggle { display: none; }
    .main-nav {
        position: static;
        display: flex;
        flex-direction: row;
        width: auto;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        gap: 4px;
    }
    .docs-hero { padding: 70px 0 32px; }
    .docs-hero-grid { grid-template-columns: minmax(0, 1fr) minmax(420px, .9fr); gap: 46px; }
    .docs-layout { grid-template-columns: 250px minmax(0, 1fr); gap: 30px; }
    .docs-sidebar { position: sticky; top: 94px; }
    .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .doc-page-layout { grid-template-columns: minmax(0, 1fr) 300px; }
    .page-hero-card { padding: 34px; }
}