:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fa8;
    --primary-soft: #eaf4ff;
    --primary-pale: #f4f9ff;
    --ink: #142033;
    --muted: #627089;
    --line: #dfeaf7;
    --card: rgba(255, 255, 255, 0.86);
    --white: #ffffff;
    --shadow: 0 18px 45px rgba(33, 91, 158, 0.10);
    --radius: 20px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #f6fbff 0%, #ffffff 36%, #f8fbff 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% - 36px)); margin: 0 auto; }
.section { padding: 54px 0; }
.section-title { margin: 0 0 18px; font-size: clamp(26px, 4vw, 42px); letter-spacing: -0.04em; line-height: 1.2; }
.section-lead { max-width: 760px; margin: 0 0 30px; color: var(--muted); font-size: 16px; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(223, 234, 247, 0.9);
}
.header-inner {
    width: min(1160px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #162a45; font-size: 20px; letter-spacing: -0.02em; }
.logo { width: 38px; height: 38px; object-fit: contain; }
.site-nav { display: none; flex-direction: column; gap: 6px; position: absolute; left: 14px; right: 14px; top: 72px; padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.site-nav.is-open { display: flex; }
.site-nav a { padding: 11px 13px; border-radius: 12px; color: #536177; font-size: 14px; }
.site-nav a:hover, .site-nav a.active { color: var(--primary-dark); background: var(--primary-soft); }
.nav-toggle { width: 42px; height: 42px; display: inline-flex; flex-direction: column; justify-content: center; align-items: center; gap: 5px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.nav-toggle span { width: 18px; height: 2px; background: #244260; border-radius: 999px; }
.docs-hero { padding: 64px 0 30px; }
.hero-panel {
    display: grid;
    gap: 28px;
    align-items: center;
    padding: 28px;
    border: 1px solid rgba(223, 234, 247, .96);
    border-radius: 28px;
    background: radial-gradient(circle at 15% 0%, #eaf4ff 0%, rgba(255,255,255,.95) 34%, #fff 100%);
    box-shadow: var(--shadow);
}
.eyebrow, .doc-badge { display: inline-flex; align-items: center; width: fit-content; gap: 8px; padding: 7px 11px; border-radius: 999px; background: var(--primary-soft); color: var(--primary-dark); font-size: 13px; font-weight: 700; }
.hero-copy h1, .page-hero h1 { margin: 16px 0 14px; font-size: clamp(34px, 7vw, 62px); line-height: 1.08; letter-spacing: -0.06em; }
.hero-copy p, .page-hero p { color: var(--muted); margin: 0 0 22px; font-size: 16px; max-width: 640px; }
.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 14px 30px rgba(70,139,223,.24); transition: transform .2s ease, box-shadow .2s ease; }
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 18px 38px rgba(70,139,223,.28); }
.tag-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.security-tag { display: inline-flex; padding: 7px 11px; border-radius: 999px; border: 1px solid var(--line); background: rgba(255,255,255,.75); color: #42546c; font-size: 13px; }
.hero-visual { position: relative; display: grid; gap: 14px; }
.app-shell { padding: 18px; border-radius: 28px; border: 1px solid var(--line); background: linear-gradient(180deg, #ffffff, #f1f7ff); box-shadow: inset 0 1px 0 #fff, var(--shadow); }
.app-shell img { width: min(320px, 100%); margin: 0 auto; border-radius: 22px; }
.status-card { padding: 16px; border-radius: 18px; border: 1px solid var(--line); background: rgba(255,255,255,.92); box-shadow: 0 10px 30px rgba(33,91,158,.07); }
.status-card strong { display: block; margin-bottom: 4px; color: #173254; }
.status-card span, .status-card p { color: var(--muted); font-size: 14px; margin: 0; }
.status-grid { display: grid; gap: 12px; }
.safety-strip { margin: 20px auto 0; width: min(1120px, calc(100% - 36px)); padding: 16px; border-radius: 18px; background: #edf7ff; border: 1px solid #d9ebff; display: grid; gap: 10px; color: #31506e; }
.safety-strip span { display: flex; gap: 8px; align-items: flex-start; }
.safety-strip b { color: var(--primary-dark); }
.docs-layout { display: grid; gap: 28px; align-items: start; }
.docs-sidebar { border: 1px solid var(--line); border-radius: 20px; background: rgba(255,255,255,.86); padding: 16px; box-shadow: 0 12px 35px rgba(33,91,158,.06); }
.docs-sidebar h2 { margin: 0 0 12px; font-size: 16px; }
.docs-sidebar a { display: block; padding: 10px 12px; border-radius: 12px; color: #51627a; font-size: 14px; }
.docs-sidebar a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.docs-content { display: grid; gap: 44px; min-width: 0; }
.doc-section { scroll-margin-top: 96px; }
.doc-heading { margin: 0 0 16px; font-size: clamp(24px, 3.6vw, 36px); line-height: 1.2; letter-spacing: -0.04em; }
.doc-kicker { font-weight: 800; color: var(--primary); letter-spacing: .08em; font-size: 13px; }
.notice-box { padding: 18px; border-radius: 18px; border-left: 4px solid var(--primary); background: var(--primary-soft); color: #31506e; }
.docs-steps { display: grid; gap: 14px; }
.step-card { display: grid; gap: 8px; padding: 18px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.step-card .step-number { width: 34px; height: 34px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; background: var(--primary); color: #fff; font-weight: 800; }
.step-card h3 { margin: 0; font-size: 18px; }
.step-card p { margin: 0; color: var(--muted); }
.inline-link { color: var(--primary-dark); font-weight: 800; }
.docs-category-grid, .doc-card-grid, .risk-grid, .faq-grid, .feature-grid { display: grid; gap: 16px; }
.category-card, .document-card, .risk-item, .faq-item, .feature-card, .principle-item, .scenario-card { border: 1px solid var(--line); border-radius: 20px; background: rgba(255,255,255,.92); padding: 20px; box-shadow: 0 12px 32px rgba(33,91,158,.06); }
.category-card h3, .document-card h3, .risk-item h3, .faq-item h3, .feature-card h3, .scenario-card h3 { margin: 0 0 8px; font-size: 19px; }
.category-card p, .document-card p, .risk-item p, .faq-item p, .feature-card p, .scenario-card p { margin: 0 0 12px; color: var(--muted); }
.card-link { color: var(--primary-dark); font-weight: 800; }
.principle-list { display: grid; gap: 14px; }
.principle-item { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; }
.principle-index { width: 38px; height: 38px; border-radius: 13px; background: var(--primary-soft); color: var(--primary-dark); display: inline-flex; align-items: center; justify-content: center; font-weight: 900; }
.principle-item h3 { margin: 0 0 5px; }
.principle-item p { margin: 0; color: var(--muted); }
.risk-item { background: linear-gradient(180deg, #fff, #f8fbff); }
.risk-label { color: var(--primary); font-weight: 900; font-size: 13px; }
.cta-section { text-align: center; padding: 42px 24px; border: 1px solid #d9ebff; border-radius: 28px; background: linear-gradient(135deg, #eef7ff, #ffffff 58%, #f2f8ff); }
.cta-section p { max-width: 680px; margin: 0 auto 20px; color: var(--muted); }
.page-hero { padding: 54px 0 20px; }
.page-hero-inner { border: 1px solid var(--line); border-radius: 26px; background: linear-gradient(135deg, #ffffff, #f2f8ff); padding: 28px; box-shadow: var(--shadow); }
.page-layout { display: grid; gap: 22px; align-items: start; padding: 28px 0 64px; }
.article { border: 1px solid var(--line); border-radius: 24px; background: #fff; padding: 24px; box-shadow: 0 14px 36px rgba(33,91,158,.06); }
.article h2 { margin: 28px 0 10px; font-size: 24px; letter-spacing: -0.03em; }
.article h2:first-child { margin-top: 0; }
.article p { color: #46566f; }
.article ul, .article ol { padding-left: 20px; color: #46566f; }
.side-panel { display: grid; gap: 14px; }
.side-card { border: 1px solid var(--line); border-radius: 20px; padding: 18px; background: var(--primary-pale); }
.side-card h3 { margin: 0 0 8px; }
.side-card p, .side-card li { color: var(--muted); font-size: 14px; }
.check-list { display: grid; gap: 10px; padding: 0; margin: 16px 0 0; list-style: none; }
.check-list li { padding: 12px 14px; border-radius: 14px; background: var(--primary-pale); border: 1px solid var(--line); }
.download-note { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--line); }
.faq-page { display: grid; gap: 16px; }
.faq-item details { display: block; }
.faq-item summary { cursor: pointer; font-weight: 800; color: #1c3452; }
.faq-item details p { margin: 12px 0 0; }
.site-footer { background: #f5f9ff; border-top: 1px solid var(--line); padding: 42px 0 0; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.footer-brand img { width: 34px; height: 34px; }
.site-footer h3 { margin: 0 0 10px; font-size: 16px; }
.site-footer p, .site-footer a { color: var(--muted); font-size: 14px; }
.site-footer a { display: block; margin: 7px 0; }
.footer-bottom { margin-top: 30px; padding: 18px; text-align: center; border-top: 1px solid var(--line); color: #6a7890; font-size: 13px; }
@media (min-width: 700px) {
    .safety-strip { grid-template-columns: repeat(3, 1fr); }
    .docs-category-grid, .doc-card-grid, .risk-grid, .faq-grid, .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: 1.4fr .8fr .8fr 1fr; }
}
@media (min-width: 980px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; flex-direction: row; padding: 0; border: 0; box-shadow: none; background: transparent; gap: 4px; }
    .site-nav a { padding: 9px 12px; }
    .hero-panel { grid-template-columns: 1.05fr .95fr; padding: 46px; }
    .status-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .status-card.float-one { transform: translateY(-10px); }
    .status-card.float-two { transform: translateY(10px); }
    .docs-layout { grid-template-columns: 260px minmax(0, 1fr); }
    .docs-sidebar { position: sticky; top: 94px; }
    .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .doc-card-grid, .risk-grid, .feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .page-layout { grid-template-columns: minmax(0, 760px) 300px; }
    .article { padding: 34px; }
}