:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(42, 96, 172);
    --primary-soft: rgb(232, 243, 255);
    --primary-softer: rgb(245, 249, 255);
    --ink: rgb(24, 38, 58);
    --muted: rgb(91, 106, 128);
    --line: rgb(219, 230, 244);
    --card: rgba(255, 255, 255, .92);
    --bg: rgb(247, 251, 255);
    --radius: 18px;
    --shadow: 0 14px 40px rgba(24, 66, 120, .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%, var(--bg) 42%, #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: 100;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}
.header-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 66px;
    gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; }
.logo-img { width: 38px; height: 38px; object-fit: contain; }
.brand-text { font-size: 18px; color: var(--ink); }
.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;
    gap: 5px;
    padding: 0 10px;
}
.nav-toggle span { display: block; height: 2px; background: var(--ink); border-radius: 2px; }
.site-nav {
    position: absolute;
    top: 66px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    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: 10px 12px;
    color: var(--muted);
    border-radius: 12px;
    font-size: 15px;
}
.site-nav a.active, .site-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }

.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.narrow-container { width: min(900px, calc(100% - 32px)); margin: 0 auto; }
section { padding: 48px 0; }

.docs-hero {
    padding: 50px 0 28px;
    background:
        radial-gradient(circle at 15% 10%, rgba(70,139,223,.14), transparent 34%),
        linear-gradient(135deg, #fff 0%, #f4f9ff 100%);
}
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 26px; align-items: center; }
.eyebrow, .doc-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
    border: 1px solid rgba(70,139,223,.18);
}
h1 { margin: 14px 0 14px; line-height: 1.15; font-size: clamp(32px, 7vw, 58px); letter-spacing: -.045em; }
h2 { margin: 0 0 18px; line-height: 1.25; font-size: clamp(24px, 4vw, 34px); letter-spacing: -.03em; }
h3 { margin: 0 0 10px; line-height: 1.35; font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.lead { font-size: 17px; color: rgb(63, 78, 101); max-width: 670px; }
.hero-actions { display: flex; align-items: center; gap: 14px; margin-top: 24px; flex-wrap: wrap; }
.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 10px 24px rgba(70,139,223,.22);
    border: 1px solid rgba(20, 70, 130, .05);
    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); }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.security-tags span {
    padding: 8px 11px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,.72);
    border-radius: 999px;
    color: var(--muted);
    font-size: 13px;
}
.hero-device {
    display: grid;
    gap: 16px;
    background: rgba(255,255,255,.78);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 18px;
    box-shadow: var(--shadow);
}
.app-frame {
    border-radius: 24px;
    background: linear-gradient(180deg, #f7fbff 0%, #edf6ff 100%);
    padding: 16px;
    border: 1px solid rgba(70,139,223,.12);
}
.status-grid { display: grid; gap: 12px; }
.status-card, .security-panel, .doc-card, .category-card, .risk-item, .faq-item, .step-item, .principle-item, .info-card, .guide-card, .about-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 10px 28px rgba(24,66,120,.06);
}
.status-card { padding: 15px; }
.status-card strong { display: block; margin-bottom: 4px; color: var(--ink); }
.status-card p { margin: 0; font-size: 14px; }

.safety-strip { padding: 18px 0; }
.safety-strip .strip-inner {
    display: grid;
    gap: 10px;
    padding: 16px;
    border-radius: 20px;
    background: var(--primary-soft);
    border: 1px solid rgba(70,139,223,.16);
}
.strip-item { display: flex; gap: 10px; align-items: flex-start; color: rgb(47, 67, 94); font-size: 14px; }
.strip-dot { flex: 0 0 8px; width: 8px; height: 8px; border-radius: 50%; background: var(--primary); margin-top: 8px; }

.docs-layout { display: grid; grid-template-columns: 1fr; gap: 22px; align-items: start; }
.docs-sidebar {
    background: rgba(255,255,255,.82);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 14px;
}
.docs-sidebar h2 { font-size: 16px; margin: 0 0 10px; }
.docs-sidebar nav { display: grid; grid-template-columns: 1fr; gap: 6px; }
.docs-sidebar a {
    padding: 10px 12px;
    border-radius: 12px;
    color: var(--muted);
    font-size: 14px;
}
.docs-sidebar a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.docs-content { display: grid; gap: 28px; min-width: 0; }
.content-section { scroll-margin-top: 90px; }
.section-title { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.section-number { color: var(--primary); font-weight: 900; letter-spacing: .06em; }
.security-panel { padding: 20px; background: linear-gradient(180deg, #fff 0%, #f8fbff 100%); }
.notice-box {
    padding: 16px 18px;
    margin: 18px 0;
    border-radius: 16px;
    background: var(--primary-soft);
    border-left: 4px solid var(--primary);
    color: rgb(47, 67, 94);
}
.notice-box strong { color: var(--primary-dark); }

.docs-steps { display: grid; gap: 12px; counter-reset: step; }
.step-item { display: grid; gap: 8px; padding: 18px; position: relative; overflow: hidden; }
.step-top { display: flex; align-items: center; gap: 12px; }
.step-no {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}
.step-item a, .doc-card a, .category-card a, .risk-item a, .guide-card a { color: var(--primary-dark); font-weight: 800; }

.docs-category-grid, .feature-grid, .risk-grid, .about-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.category-card, .doc-card, .info-card, .about-card { padding: 18px; }
.category-card:hover, .doc-card:hover { border-color: rgba(70,139,223,.38); transform: translateY(-1px); transition: .18s ease; }
.principle-list { display: grid; gap: 12px; }
.principle-item { display: grid; grid-template-columns: auto 1fr; gap: 14px; padding: 18px; }
.principle-no { font-weight: 900; color: var(--primary); font-size: 18px; }
.risk-item { padding: 18px; }
.risk-item .label { display: inline-block; color: var(--primary-dark); background: var(--primary-soft); border-radius: 999px; padding: 4px 10px; font-size: 12px; font-weight: 800; margin-bottom: 10px; }
.faq-list { display: grid; gap: 12px; }
.faq-item { padding: 18px; }
.faq-item h3 { font-size: 17px; }
.cta-section {
    padding: 52px 0 64px;
}
.cta-panel {
    text-align: center;
    padding: 34px 20px;
    border-radius: 28px;
    background: linear-gradient(135deg, var(--primary-soft) 0%, #ffffff 55%, #f7fbff 100%);
    border: 1px solid rgba(70,139,223,.18);
    box-shadow: var(--shadow);
}
.cta-panel p { max-width: 700px; margin-left: auto; margin-right: auto; }

.page-hero { padding: 46px 0 24px; }
.doc-header { background: linear-gradient(135deg, #fff 0%, #f3f8ff 100%); border-bottom: 1px solid var(--line); }
.page-hero h1 { max-width: 880px; }
.guide-shell { display: grid; grid-template-columns: 1fr; gap: 22px; align-items: start; padding-bottom: 56px; }
.guide-main { display: grid; gap: 20px; min-width: 0; }
.guide-card { padding: 20px; }
.guide-card h2 { font-size: 24px; }
.guide-aside { display: grid; gap: 14px; }
.aside-box {
    padding: 18px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,.9);
}
.aside-box h2 { font-size: 18px; margin-bottom: 10px; }
.check-list, .plain-list { padding-left: 0; margin: 0; display: grid; gap: 10px; list-style: none; }
.check-list li, .plain-list li {
    padding: 12px 12px 12px 36px;
    border-radius: 14px;
    background: var(--primary-softer);
    border: 1px solid var(--line);
    position: relative;
    color: var(--muted);
}
.check-list li::before {
    content: "";
    position: absolute;
    left: 14px;
    top: 20px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
}
.inline-link-list { display: flex; flex-wrap: wrap; gap: 10px; }
.inline-link-list a { padding: 8px 11px; border-radius: 999px; background: var(--primary-soft); color: var(--primary-dark); font-weight: 800; font-size: 13px; }
.download-block { padding-top: 4px; }

.download-steps { display: grid; gap: 12px; margin: 22px 0; }
.download-step { padding: 18px; border: 1px solid var(--line); border-radius: 18px; background: #fff; display: grid; gap: 4px; }
.download-step strong { color: var(--ink); }

.site-footer { background: rgb(22, 39, 62); color: #dce8f7; padding: 34px 0; }
.footer-inner { width: min(1180px, calc(100% - 32px)); margin: 0 auto; display: grid; gap: 22px; }
.footer-brand { color: #fff; font-weight: 900; font-size: 18px; margin-bottom: 8px; }
.site-footer p { color: rgba(220,232,247,.76); margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; }
.footer-links a { color: #fff; opacity: .86; padding: 8px 10px; border-radius: 999px; background: rgba(255,255,255,.08); }

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

@media (min-width: 960px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { padding: 8px 12px; }
    .docs-hero { padding: 74px 0 36px; }
    .hero-grid { grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); gap: 44px; }
    .docs-layout { grid-template-columns: 260px minmax(0, 1fr); gap: 28px; }
    .docs-sidebar { position: sticky; top: 88px; }
    .docs-sidebar nav { grid-template-columns: 1fr; }
    .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)); }
    .guide-shell { grid-template-columns: minmax(0, 760px) 300px; gap: 28px; }
    .guide-aside { position: sticky; top: 88px; }
    .footer-inner { grid-template-columns: 1fr auto; align-items: center; }
}