:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fa8;
    --primary-soft: #eaf4ff;
    --primary-lighter: #f4f9ff;
    --ink: #15233b;
    --muted: #64748b;
    --line: #dce8f6;
    --card: #ffffff;
    --bg: #f7fbff;
    --radius: 18px;
    --shadow: 0 14px 40px rgba(25, 70, 120, 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, #ffffff 0%, #f4f9ff 36%, #ffffff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(16px);
}
.header-inner, .footer-inner, .container, .docs-container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}
.header-inner {
    min-height: 68px;
    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; color: var(--ink); }
.logo img { width: 34px; height: 34px; border-radius: 10px; }
.logo span { font-size: 20px; }
.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
}
.nav-toggle span { width: 18px; height: 2px; background: var(--ink); border-radius: 10px; }
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    display: none;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow);
}
.site-nav.is-open { display: grid; gap: 4px; }
.site-nav a { padding: 10px 12px; border-radius: 12px; color: #38506d; font-size: 15px; }
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }

.section { padding: 52px 0; }
.section.compact { padding: 34px 0; }
.section-title { margin: 0 0 14px; font-size: clamp(26px, 5vw, 42px); line-height: 1.18; letter-spacing: -0.02em; }
.section-lead { margin: 0 0 26px; color: var(--muted); max-width: 760px; }
.eyebrow, .doc-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 5px 11px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: var(--primary-soft);
    border: 1px solid #cfe5ff;
    font-size: 13px;
    font-weight: 700;
}
.docs-hero {
    padding: 44px 0 24px;
    background: radial-gradient(circle at 20% 0%, rgba(70,139,223,0.16), transparent 30%), linear-gradient(180deg,#ffffff 0%,#f5faff 100%);
}
.docs-hero-grid { display: grid; gap: 28px; align-items: center; }
.hero-copy h1 { margin: 18px 0 16px; font-size: clamp(34px, 8vw, 58px); line-height: 1.06; letter-spacing: -0.04em; }
.hero-copy p { color: #475569; margin: 0 0 24px; font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 22px;
    border-radius: 14px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    letter-spacing: 0.02em;
    box-shadow: 0 12px 24px rgba(70,139,223,0.25);
    border: 0;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease;
}
.download-btn:hover { transform: translateY(-1px); box-shadow: 0 16px 32px rgba(70,139,223,0.28); }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.security-tags span { padding: 7px 10px; background: #fff; border: 1px solid var(--line); border-radius: 999px; font-size: 13px; color: #38506d; }
.hero-visual {
    position: relative;
    display: grid;
    gap: 14px;
    padding: 18px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,0.76);
    border-radius: 26px;
    box-shadow: var(--shadow);
}
.app-frame {
    padding: 22px;
    border-radius: 24px;
    background: linear-gradient(145deg, #eef7ff, #ffffff);
    display: grid;
    place-items: center;
}
.app-frame img { width: min(280px, 76vw); }
.status-cards { display: grid; gap: 10px; }
.status-card, .info-card, .doc-card, .category-card, .risk-item, .faq-item, .step-card, .principle-item, .security-panel, .checklist-panel {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(25,70,120,0.04);
}
.status-card { padding: 14px; }
.status-card strong { display: block; color: var(--ink); }
.status-card span { display: block; color: var(--muted); font-size: 14px; margin-top: 3px; }
.safety-strip { padding: 16px 0; }
.safety-strip-inner {
    display: grid;
    gap: 10px;
    padding: 14px;
    border: 1px solid #cfe5ff;
    border-radius: 18px;
    background: linear-gradient(90deg, var(--primary-soft), #ffffff);
}
.safety-strip span { color: #315172; font-size: 14px; }

.docs-layout { display: grid; gap: 22px; align-items: start; }
.docs-sidebar {
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: var(--shadow);
}
.docs-sidebar strong { display: block; margin: 0 0 8px; color: var(--ink); }
.docs-sidebar nav { display: grid; grid-template-columns: 1fr; gap: 7px; }
.docs-sidebar a { padding: 10px 12px; border-radius: 12px; color: #46617f; background: #f8fbff; border: 1px solid transparent; }
.docs-sidebar a:hover { color: var(--primary-dark); border-color: #cfe5ff; background: var(--primary-soft); }
.docs-content { display: grid; gap: 28px; min-width: 0; }
.content-block { padding: 22px; background: #fff; border: 1px solid var(--line); border-radius: 24px; }
.content-block h2, .doc-section h2 { margin: 0 0 14px; font-size: clamp(22px, 4vw, 30px); line-height: 1.25; }
.content-block p { color: #51657d; margin: 0 0 14px; }
.docs-steps { display: grid; gap: 12px; counter-reset: step; }
.step-card { padding: 16px; display: grid; gap: 8px; }
.step-no { color: var(--primary); font-weight: 900; font-size: 13px; letter-spacing: 0.08em; }
.step-card h3 { margin: 0; font-size: 18px; }
.step-card p { margin: 0; color: var(--muted); }
.step-card a, .text-link { color: var(--primary-dark); font-weight: 700; }
.docs-category-grid, .risk-grid, .feature-grid, .faq-grid { display: grid; gap: 14px; }
.category-card, .doc-card, .risk-item, .info-card { padding: 18px; }
.category-card h3, .doc-card h3, .risk-item h3, .info-card h3 { margin: 0 0 8px; font-size: 18px; }
.category-card p, .doc-card p, .risk-item p, .info-card p { margin: 0 0 12px; color: var(--muted); }
.card-link { color: var(--primary-dark); font-weight: 800; }
.principle-list { display: grid; gap: 12px; }
.principle-item { padding: 16px; display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: start; }
.principle-item .num { width: 34px; height: 34px; border-radius: 12px; background: var(--primary-soft); color: var(--primary-dark); display: grid; place-items: center; font-weight: 900; }
.principle-item h3 { margin: 0 0 4px; font-size: 17px; }
.principle-item p { margin: 0; color: var(--muted); }
.notice, .warning, .suggestion {
    padding: 16px 18px;
    border-radius: 16px;
    border-left: 4px solid var(--primary);
    background: var(--primary-soft);
    color: #35506a;
}
.warning { background: #fff7ed; border-left-color: #f59e0b; }
.suggestion { background: #f6fbff; }
.cta-section { text-align: center; padding: 34px 20px; border-radius: 26px; border: 1px solid #cfe5ff; background: linear-gradient(135deg, #eef7ff 0%, #ffffff 100%); }
.cta-section h2 { margin: 0 0 10px; font-size: clamp(24px, 5vw, 36px); }
.cta-section p { margin: 0 auto 20px; color: var(--muted); max-width: 680px; }

.page-hero { padding: 46px 0 22px; background: linear-gradient(180deg, #f5faff 0%, #ffffff 100%); }
.page-title-wrap { max-width: 840px; }
.page-title-wrap h1 { margin: 14px 0 12px; font-size: clamp(32px, 7vw, 50px); line-height: 1.1; letter-spacing: -0.03em; }
.page-title-wrap p { color: var(--muted); margin: 0; font-size: 17px; }
.doc-page-layout { display: grid; gap: 20px; align-items: start; }
.article { display: grid; gap: 18px; }
.doc-section { padding: 22px; background: #fff; border: 1px solid var(--line); border-radius: 22px; }
.doc-section p { color: #51657d; margin: 0 0 12px; }
.doc-section p:last-child { margin-bottom: 0; }
.doc-list, .checklist { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.doc-list li, .checklist li {
    padding: 12px 14px;
    border-radius: 14px;
    background: #f8fbff;
    border: 1px solid var(--line);
    color: #405872;
}
.side-panel { display: grid; gap: 14px; }
.security-panel, .checklist-panel { padding: 18px; }
.security-panel h3, .checklist-panel h3 { margin: 0 0 10px; }
.security-panel p, .checklist-panel p { margin: 0; color: var(--muted); }
.download-block { margin-top: 6px; }
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 18px; }
.faq-item h2, .faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.faq-item p { margin: 0; color: #51657d; }
.about-grid { display: grid; gap: 16px; }
.kpi-row { display: grid; gap: 12px; }
.kpi { padding: 18px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.kpi strong { display: block; font-size: 24px; color: var(--primary-dark); }
.kpi span { color: var(--muted); font-size: 14px; }

.site-footer { margin-top: 60px; background: #eff6ff; border-top: 1px solid var(--line); }
.footer-inner { padding: 34px 0; display: grid; gap: 24px; }
.footer-brand p { color: var(--muted); margin: 12px 0 0; max-width: 460px; }
.footer-links { display: grid; gap: 18px; }
.footer-links div { display: grid; gap: 8px; }
.footer-links strong { color: var(--ink); }
.footer-links a { color: #536b86; font-size: 14px; }
.footer-bottom { padding: 14px; border-top: 1px solid var(--line); text-align: center; color: #64748b; font-size: 13px; }

@media (min-width: 680px) {
    .docs-category-grid, .risk-grid, .feature-grid, .faq-grid, .about-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .safety-strip-inner { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .kpi-row { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { padding: 9px 12px; }
    .docs-hero { padding: 70px 0 34px; }
    .docs-hero-grid { grid-template-columns: minmax(0, 1.04fr) minmax(340px, .86fr); gap: 42px; }
    .docs-layout { grid-template-columns: 260px minmax(0, 1fr); gap: 28px; }
    .docs-sidebar { position: sticky; top: 92px; }
    .doc-page-layout { grid-template-columns: minmax(0, 760px) 300px; gap: 28px; }
    .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid, .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .footer-inner { grid-template-columns: 1.1fr 1fr; align-items: start; }
    .footer-links { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .content-block, .doc-section { padding: 28px; }
}