:root {
    --primary: rgb(70,139,223);
    --primary-dark: #235da8;
    --primary-soft: #eaf4ff;
    --primary-softer: #f5faff;
    --ink: #13243a;
    --muted: #5f6f84;
    --line: #dce8f5;
    --card: #ffffff;
    --bg: #f7fbff;
    --shadow: 0 16px 36px rgba(26, 72, 125, .08);
    --radius: 18px;
}
* { 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, #f3f8ff 0%, #ffffff 38%, #f7fbff 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(100% - 32px, 1180px); margin: 0 auto; }
.section { padding: 52px 0; }
.section-title { margin: 0 0 18px; font-size: clamp(24px, 4vw, 38px); line-height: 1.25; }
.section-kicker { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 12px; color: var(--primary-dark); font-weight: 700; font-size: 14px; letter-spacing: .04em; }
.section-kicker::before { content: ""; width: 24px; height: 2px; background: var(--primary); border-radius: 99px; }
.lead { color: var(--muted); font-size: 17px; margin: 0 0 20px; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(220,232,245,.9);
}
.header-inner { width: min(100% - 28px, 1180px); margin: 0 auto; min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink); letter-spacing: .01em; }
.logo { width: 40px; height: 40px; border-radius: 12px; }
.nav-toggle { display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 12px; background: #fff; color: var(--ink); font-size: 20px; }
.site-nav { display: none; position: absolute; top: 68px; left: 14px; right: 14px; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.site-nav.is-open { display: grid; gap: 4px; }
.site-nav a { padding: 12px 14px; border-radius: 12px; color: var(--muted); font-weight: 650; }
.site-nav a.active, .site-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }
.docs-hero { padding: 54px 0 28px; }
.hero-grid { display: grid; gap: 28px; align-items: center; }
.hero-copy { padding: 22px 0; }
.hero-copy h1 { margin: 0 0 18px; font-size: clamp(34px, 8vw, 62px); line-height: 1.08; letter-spacing: -.04em; }
.hero-copy p { color: var(--muted); margin: 0 0 24px; font-size: 17px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.hero-tags span { padding: 8px 12px; background: #fff; border: 1px solid var(--line); border-radius: 999px; color: #34506e; font-size: 13px; box-shadow: 0 8px 18px rgba(70,139,223,.06); }
.hero-visual { position: relative; display: grid; gap: 16px; padding: 18px; border: 1px solid var(--line); border-radius: 28px; background: linear-gradient(145deg, rgba(255,255,255,.95), rgba(234,244,255,.82)); box-shadow: var(--shadow); }
.app-frame { display: grid; place-items: center; min-height: 320px; border-radius: 24px; background: radial-gradient(circle at 50% 0%, rgba(70,139,223,.24), transparent 45%), #fff; border: 1px solid rgba(220,232,245,.9); }
.app-frame img { max-height: 430px; object-fit: contain; }
.security-panel { display: grid; gap: 10px; }
.security-card { padding: 14px 16px; background: rgba(255,255,255,.88); border: 1px solid var(--line); border-radius: 16px; }
.security-card strong { display: block; margin-bottom: 4px; color: var(--ink); }
.security-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.6; }
.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 12px 24px rgba(70,139,223,.22); transition: transform .18s ease, box-shadow .18s ease, background .18s ease; }
.download-btn:hover { transform: translateY(-1px); background: var(--primary-dark); box-shadow: 0 14px 28px rgba(70,139,223,.26); }
.safety-strip { margin: 16px auto 34px; padding: 14px; border: 1px solid #cfe4fb; border-radius: 18px; background: linear-gradient(90deg, #eef7ff, #f8fbff); display: grid; gap: 10px; color: #284760; }
.safety-strip span { display: flex; align-items: flex-start; gap: 8px; }
.safety-strip span::before { content: "•"; color: var(--primary); font-weight: 900; }
.docs-layout { display: grid; gap: 24px; align-items: start; }
.docs-sidebar { border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,255,255,.94); padding: 16px; box-shadow: var(--shadow); }
.docs-sidebar h2 { margin: 0 0 12px; 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); border: 1px solid transparent; }
.docs-sidebar a:hover { color: var(--primary-dark); background: var(--primary-soft); border-color: #d8ebff; }
.docs-content { display: grid; gap: 32px; min-width: 0; }
.doc-section { padding: 24px; border: 1px solid var(--line); border-radius: 22px; background: rgba(255,255,255,.94); box-shadow: 0 12px 28px rgba(26,72,125,.06); }
.doc-section h2 { margin: 0 0 12px; font-size: clamp(22px, 3vw, 30px); }
.doc-section p { color: var(--muted); margin: 0 0 16px; }
.docs-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { display: grid; grid-template-columns: auto 1fr; gap: 14px; padding: 16px; border: 1px solid var(--line); border-radius: 16px; background: #fbfdff; }
.step-no { width: 42px; height: 42px; border-radius: 13px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary-dark); font-weight: 900; }
.step-card h3 { margin: 0 0 4px; font-size: 18px; }
.step-card p { margin: 0 0 8px; font-size: 15px; }
.text-link { color: var(--primary-dark); font-weight: 750; }
.docs-category-grid { display: grid; gap: 14px; }
.category-card, .document-card, .risk-item, .faq-item, .principle-item { border: 1px solid var(--line); border-radius: 18px; background: #fff; padding: 18px; }
.category-card { transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease; }
.category-card:hover { transform: translateY(-2px); border-color: #bfdcff; box-shadow: 0 16px 32px rgba(70,139,223,.1); }
.category-card h3, .document-card h3, .risk-item h3, .faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.category-card p, .document-card p, .risk-item p, .faq-item p { margin: 0 0 12px; color: var(--muted); font-size: 15px; }
.principle-list { display: grid; gap: 12px; }
.principle-item { display: grid; gap: 10px; background: linear-gradient(180deg, #fff, #fbfdff); }
.principle-item span { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--primary); color: #fff; font-weight: 900; }
.principle-item h3 { margin: 0 0 4px; }
.principle-item p { margin: 0; color: var(--muted); }
.notice-box, .safety-notice { padding: 16px 18px; border-left: 4px solid var(--primary); background: var(--primary-soft); border-radius: 14px; color: #284760; }
.notice-box strong, .safety-notice strong { color: var(--primary-dark); }
.feature-grid, .risk-grid, .faq-grid { display: grid; gap: 14px; }
.risk-item { background: linear-gradient(180deg, #fff, #f9fcff); }
.risk-item .suggestion { display: block; margin-top: 8px; padding-top: 8px; border-top: 1px dashed #cddff3; color: #2e5578; font-size: 14px; }
.cta-section { text-align: center; padding: 40px 20px; border-radius: 26px; background: linear-gradient(135deg, #eef7ff, #fff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.cta-section p { color: var(--muted); margin: 0 auto 20px; max-width: 680px; }
.page-hero { padding: 48px 0 24px; }
.page-title-wrap { max-width: 840px; }
.badge { display: inline-flex; align-items: center; padding: 7px 12px; border-radius: 999px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 800; font-size: 13px; margin-bottom: 14px; }
.page-hero h1 { margin: 0 0 14px; font-size: clamp(30px, 6vw, 48px); line-height: 1.16; letter-spacing: -.03em; }
.page-hero p { margin: 0; color: var(--muted); font-size: 17px; }
.article-layout { display: grid; gap: 22px; align-items: start; padding-bottom: 58px; }
.article-main { display: grid; gap: 18px; }
.article-card { padding: 22px; border: 1px solid var(--line); border-radius: 22px; background: rgba(255,255,255,.96); box-shadow: 0 10px 24px rgba(26,72,125,.05); }
.article-card h2 { margin: 0 0 12px; font-size: 24px; }
.article-card p { color: var(--muted); margin: 0 0 14px; }
.article-card ul, .article-card ol { margin: 0; padding-left: 20px; color: var(--muted); }
.article-card li + li { margin-top: 8px; }
.article-side { display: grid; gap: 14px; }
.side-card { padding: 18px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.side-card h3 { margin: 0 0 8px; }
.side-card p { margin: 0; color: var(--muted); font-size: 15px; }
.check-list { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.check-list li { display: grid; grid-template-columns: 24px 1fr; gap: 8px; color: var(--muted); }
.check-list li::before { content: "✓"; display: grid; place-items: center; width: 22px; height: 22px; border-radius: 7px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 900; }
.process-list { display: grid; gap: 12px; }
.process-item { padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: #fbfdff; }
.process-item strong { display: block; margin-bottom: 4px; }
.download-panel { text-align: left; }
.download-panel .download-btn { margin-top: 10px; }
.download-page .article-main { max-width: 860px; }
.faq-list { display: grid; gap: 14px; }
.faq-item h2 { margin: 0 0 8px; font-size: 20px; }
.faq-item p { margin: 0; color: var(--muted); }
.about-grid { display: grid; gap: 16px; }
.site-footer { margin-top: 40px; padding: 42px 0; background: #10243a; color: #d6e6f8; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { font-weight: 900; font-size: 20px; color: #fff; margin-bottom: 8px; }
.site-footer h3 { margin: 0 0 10px; color: #fff; font-size: 16px; }
.site-footer p { margin: 0; color: #b7c9dc; font-size: 14px; }
.site-footer a { display: block; color: #d6e6f8; margin: 6px 0; font-size: 14px; }
.site-footer a:hover { color: #fff; }
@media (min-width: 680px) {
    .docs-category-grid, .feature-grid, .risk-grid, .faq-grid, .about-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .safety-strip { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .principle-item { grid-template-columns: auto 1fr; align-items: start; }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1.2fr; }
}
@media (min-width: 960px) {
    .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; font-size: 15px; }
    .hero-grid { grid-template-columns: minmax(0, .95fr) minmax(420px, 1.05fr); }
    .hero-visual { grid-template-columns: minmax(260px, .9fr) minmax(220px, .65fr); }
    .docs-layout { grid-template-columns: 260px minmax(0, 1fr); }
    .docs-sidebar { position: sticky; top: 92px; }
    .docs-category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .feature-grid, .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .article-layout { grid-template-columns: minmax(0, 820px) 300px; }
    .article-main { min-width: 0; }
    .about-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .section { padding: 70px 0; }
}
@media (max-width: 380px) {
    .container, .header-inner { width: min(100% - 24px, 1180px); }
    .doc-section, .article-card { padding: 18px; }
    .download-btn { width: 100%; }
}