:root {
    --primary: rgb(70,139,223);
    --primary-dark: #225d9d;
    --primary-light: #edf6ff;
    --ink: #13233a;
    --muted: #617189;
    --line: #dce8f5;
    --card: #ffffff;
    --soft: #f6faff;
    --warn: #fff8ea;
    --radius: 18px;
    --shadow: 0 18px 44px rgba(36, 91, 151, 0.10);
}

* { 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, #f7fbff 0%, #ffffff 36%, #f8fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: var(--primary-dark); text-decoration: none; }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(220,232,245,0.9);
}
.header-inner, .footer-inner, .content-container {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
}
.header-inner {
    min-height: 68px;
    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); }
.logo { width: 38px; height: 38px; border-radius: 12px; }
.brand-text { letter-spacing: 0.02em; font-size: 20px; }
.nav-toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    padding: 0 11px;
}
.nav-toggle span { height: 2px; width: 100%; background: var(--ink); border-radius: 2px; }
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.site-nav.open { display: flex; }
.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #354760;
    font-weight: 650;
}
.site-nav a.active, .site-nav a:hover { background: var(--primary-light); color: var(--primary-dark); }

.section { padding: 42px 0; }
.docs-hero {
    padding: 46px 0 26px;
    background: radial-gradient(circle at 85% 15%, rgba(70,139,223,0.16), transparent 26%), linear-gradient(135deg, #ffffff 0%, #eef7ff 100%);
}
.docs-hero-grid {
    display: grid;
    gap: 26px;
    align-items: center;
}
.eyebrow, .doc-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 11px;
    border-radius: 999px;
    background: var(--primary-light);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 750;
    border: 1px solid rgba(70,139,223,0.2);
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 14px; color: var(--ink); }
h1 { font-size: clamp(31px, 7vw, 54px); letter-spacing: -0.03em; }
h2 { font-size: clamp(24px, 4.8vw, 34px); }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.hero-copy p { font-size: 17px; max-width: 640px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    min-width: 142px;
    padding: 12px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 10px 24px rgba(70,139,223,0.24);
    border: 0;
}
.download-btn:hover { color: #fff; background: var(--primary-dark); }
.hero-tags, .safety-strip, .mini-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}
.hero-tags span, .mini-tags span {
    border: 1px solid var(--line);
    background: rgba(255,255,255,0.78);
    color: #36506f;
    padding: 8px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 650;
}
.hero-panel {
    background: rgba(255,255,255,0.82);
    border: 1px solid rgba(220,232,245,0.95);
    border-radius: 26px;
    box-shadow: var(--shadow);
    padding: 18px;
}
.app-frame {
    display: grid;
    grid-template-columns: 0.8fr 1fr;
    gap: 14px;
    align-items: center;
}
.app-shot {
    background: linear-gradient(180deg, #ffffff, #edf6ff);
    border-radius: 24px;
    padding: 16px;
    border: 1px solid var(--line);
}
.security-panel { display: grid; gap: 10px; }
.status-card, .notice-card, .security-card, .doc-card, .category-card, .risk-item, .faq-item, .step-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
}
.status-card strong, .notice-card strong { color: var(--ink); display: block; margin-bottom: 4px; }
.status-dot { display: inline-block; width: 8px; height: 8px; background: var(--primary); border-radius: 50%; margin-right: 8px; }
.safety-strip-wrap { padding: 18px 0 8px; }
.safety-strip {
    background: #eff7ff;
    border: 1px solid #d4e8fb;
    border-left: 5px solid var(--primary);
    border-radius: 18px;
    padding: 14px 16px;
    color: #315174;
    justify-content: space-between;
}
.safety-strip span { flex: 1 1 210px; }

.docs-layout {
    display: grid;
    gap: 22px;
    padding: 32px 0 56px;
}
.docs-sidebar {
    background: rgba(255,255,255,0.86);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 14px;
    box-shadow: 0 10px 30px rgba(36,91,151,0.06);
}
.docs-sidebar strong { display: block; margin: 4px 8px 10px; }
.docs-sidebar nav { display: grid; gap: 6px; }
.docs-sidebar a {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    color: #3e5570;
    font-weight: 650;
}
.docs-sidebar a:hover { background: var(--primary-light); }
.docs-content { min-width: 0; }
.doc-section {
    padding: 26px 0;
    border-bottom: 1px solid var(--line);
}
.doc-section:last-child { border-bottom: none; }
.section-kicker { color: var(--primary-dark); font-size: 14px; font-weight: 850; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 6px; }
.docs-steps { display: grid; gap: 12px; counter-reset: step; }
.step-card { display: grid; gap: 8px; position: relative; }
.step-card .step-no {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 900;
}
.step-card a { font-weight: 800; }
.docs-category-grid, .feature-grid, .risk-grid, .faq-grid {
    display: grid;
    gap: 14px;
}
.category-card, .doc-card { transition: transform .18s ease, border-color .18s ease; }
.category-card:hover, .doc-card:hover { transform: translateY(-2px); border-color: rgba(70,139,223,0.42); }
.category-card a, .doc-card a { font-weight: 850; }
.principle-list { display: grid; gap: 12px; }
.principle-item {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 12px;
    align-items: start;
    padding: 16px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 18px;
}
.principle-item span:first-child {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 12px;
    color: #fff;
    background: var(--primary);
    font-weight: 900;
}
.callout, .safety-notice {
    border-left: 5px solid var(--primary);
    border-radius: 16px;
    background: var(--primary-light);
    padding: 16px;
    margin: 18px 0;
}
.callout.warn { background: var(--warn); border-left-color: #e5aa35; }
.check-list, .plain-list { padding-left: 0; list-style: none; display: grid; gap: 10px; margin: 14px 0; }
.check-list li, .plain-list li {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 12px 14px;
}
.check-list li::before { content: '✓'; color: var(--primary); font-weight: 900; margin-right: 8px; }
.risk-item strong, .faq-item strong { display: block; color: var(--ink); margin-bottom: 8px; }
.cta-section {
    text-align: center;
    background: linear-gradient(135deg, #eef7ff 0%, #ffffff 100%);
    border: 1px solid var(--line);
    border-radius: 26px;
    padding: 34px 20px;
    margin-top: 14px;
}

.page-hero {
    padding: 42px 0 30px;
    background: linear-gradient(135deg, #ffffff 0%, #f1f8ff 100%);
    border-bottom: 1px solid var(--line);
}
.page-hero.compact h1 { max-width: 850px; }
.page-hero p { max-width: 780px; font-size: 17px; }
.doc-page-layout {
    display: grid;
    gap: 24px;
    padding: 34px 0 58px;
}
.doc-article {
    background: rgba(255,255,255,0.86);
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 22px;
}
.doc-article section { margin-bottom: 24px; }
.doc-article section:last-child { margin-bottom: 0; }
.doc-aside {
    display: grid;
    gap: 14px;
    align-content: start;
}
.side-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 16px;
}
.side-card a { display: block; padding: 7px 0; font-weight: 750; }
.process-list { display: grid; gap: 12px; margin: 16px 0; }
.process-item {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 14px;
}
.process-item b {
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    color: var(--primary-dark);
}
.table-note { overflow: hidden; border: 1px solid var(--line); border-radius: 16px; }
.table-note div { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 10px; padding: 12px; border-bottom: 1px solid var(--line); }
.table-note div:last-child { border-bottom: none; }
.table-note strong { color: var(--ink); }
.faq-list { display: grid; gap: 14px; }
.faq-item h2, .faq-item h3 { font-size: 19px; margin-bottom: 8px; }

.site-footer {
    background: #eef5fd;
    border-top: 1px solid var(--line);
    padding: 30px 0 18px;
}
.footer-inner { display: grid; gap: 24px; }
.footer-brand { display: flex; gap: 14px; align-items: flex-start; }
.footer-logo { width: 42px; height: 42px; border-radius: 14px; }
.footer-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.footer-links a { color: #3b5470; font-weight: 700; }
.footer-bottom { width: min(1160px, calc(100% - 32px)); margin: 22px auto 0; color: #6b7b90; font-size: 13px; }

@media (min-width: 700px) {
    .docs-category-grid, .feature-grid, .risk-grid, .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .docs-hero-grid { grid-template-columns: 1.05fr 0.95fr; }
    .footer-inner { grid-template-columns: 1.4fr 1fr; align-items: start; }
    .footer-links { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 980px) {
    .nav-toggle { display: none; }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 4px;
        padding: 0;
        background: transparent;
        border: 0;
        box-shadow: none;
    }
    .site-nav a { padding: 8px 12px; }
    .docs-layout { grid-template-columns: 260px minmax(0, 1fr); align-items: start; }
    .docs-sidebar { position: sticky; top: 88px; }
    .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .feature-grid, .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .docs-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .doc-page-layout { grid-template-columns: minmax(0, 780px) 300px; align-items: start; }
    .doc-aside { position: sticky; top: 88px; }
    .doc-article { padding: 32px; }
    .section { padding: 58px 0; }
}

@media (max-width: 520px) {
    .header-inner, .footer-inner, .content-container, .footer-bottom { width: min(100% - 22px, 1160px); }
    .app-frame { grid-template-columns: 1fr; }
    .download-btn { width: 100%; }
    .hero-copy .download-btn, .cta-section .download-btn, .page-hero .download-btn { width: auto; min-width: 160px; }
    .table-note div { grid-template-columns: 1fr; }
    .process-item, .principle-item { grid-template-columns: 1fr; }
}