:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(33,92,164);
    --primary-soft: rgba(70,139,223,.12);
    --ink: #102033;
    --muted: #607087;
    --line: #dce9f7;
    --bg: #f7fbff;
    --card: rgba(255,255,255,.92);
    --radius: 22px;
    --shadow: 0 18px 45px rgba(44, 95, 146, .10);
}
* { 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:
        radial-gradient(circle at 10% 0%, rgba(70,139,223,.16), transparent 34rem),
        linear-gradient(180deg, #ffffff 0%, #f7fbff 38%, #ffffff 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% - 32px)); margin: 0 auto; }
.narrow { width: min(850px, calc(100% - 32px)); margin: 0 auto; }
.section { padding: 58px 0; }
.section-head { margin-bottom: 24px; }
.section-kicker, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}
h1, h2, h3 { margin: 0; letter-spacing: -.035em; line-height: 1.2; }
h1 { font-size: clamp(36px, 9vw, 72px); }
h2 { font-size: clamp(26px, 5vw, 44px); }
h3 { font-size: 20px; }
p { color: var(--muted); margin: 12px 0 0; }
ul, ol { color: var(--muted); padding-left: 20px; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.82);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(202,218,236,.72);
}
.header-inner {
    width: min(1180px, calc(100% - 24px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand, .footer-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; letter-spacing: -.02em; }
.logo { width: 38px; height: 38px; border-radius: 12px; }
.site-nav { display: none; gap: 8px; align-items: center; }
.site-nav a {
    padding: 9px 12px;
    color: #31445d;
    border-radius: 999px;
    font-size: 14px;
    transition: .18s ease;
}
.site-nav a:hover, .site-nav a.active { background: var(--primary-soft); color: var(--primary-dark); }
.nav-toggle { border: 0; background: #fff; width: 42px; height: 42px; border-radius: 14px; box-shadow: 0 8px 24px rgba(34,82,132,.10); display: grid; place-content: center; gap: 4px; }
.nav-toggle span { display: block; width: 18px; height: 2px; border-radius: 4px; background: var(--ink); }
.site-nav.open {
    display: grid;
    position: absolute;
    left: 12px;
    right: 12px;
    top: 74px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: var(--shadow);
}
.centered-hero { padding: 76px 0 38px; text-align: center; }
.hero-copy { max-width: 850px; margin: 0 auto; }
.hero-copy p { font-size: 18px; max-width: 760px; margin: 18px auto 0; }
.hero-actions { margin-top: 28px; display: flex; justify-content: center; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(70,139,223,.28);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 16px 38px rgba(70,139,223,.32); }
.safe-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin: 18px 0 0; }
.safe-tags span { border: 1px solid var(--line); background: rgba(255,255,255,.76); color: #41546c; padding: 7px 12px; border-radius: 999px; font-size: 13px; }
.product-bento { display: grid; gap: 16px; margin-top: 30px; }
.product-main {
    background: linear-gradient(155deg, rgba(255,255,255,.95), rgba(235,246,255,.88));
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 22px;
    box-shadow: var(--shadow);
    min-height: 360px;
    display: grid;
    place-items: center;
    overflow: hidden;
    position: relative;
}
.product-main:before { content: ""; position: absolute; inset: 12%; border-radius: 50%; background: radial-gradient(circle, rgba(70,139,223,.18), transparent 65%); }
.product-main img { width: min(280px, 72vw); position: relative; filter: drop-shadow(0 30px 45px rgba(30,75,120,.18)); }
.status-card, .card, .category-card, .feature-card, .scenario-card, .faq-item, .tip-card, .principle-card, .doc-panel, .step-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 12px 34px rgba(44,95,146,.07);
}
.status-card strong, .card strong { display: block; color: var(--ink); }
.status-card small, .card small { color: var(--muted); }
.grid-4 { display: grid; gap: 16px; }
.category-bento, .bento-grid, .scenario-grid, .guide-grid, .download-steps { display: grid; gap: 16px; }
.card-icon, .step-num {
    width: 38px;
    height: 38px;
    border-radius: 14px;
    display: inline-grid;
    place-items: center;
    color: #fff;
    font-weight: 900;
    background: var(--primary);
    margin-bottom: 12px;
}
.category-card { position: relative; overflow: hidden; }
.category-card:after { content: ""; position: absolute; right: -42px; top: -42px; width: 112px; height: 112px; border-radius: 40px; background: var(--primary-soft); transform: rotate(18deg); }
.category-card a, .text-link { color: var(--primary-dark); font-weight: 800; display: inline-flex; margin-top: 14px; }
.feature-card.large, .category-card.large { min-height: 220px; }
.roadmap { display: grid; gap: 16px; counter-reset: step; }
.roadmap-item {
    position: relative;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 20px;
    box-shadow: 0 12px 34px rgba(44,95,146,.06);
}
.roadmap-item .step-num { margin-bottom: 10px; }
.security-layout { display: grid; gap: 24px; align-items: center; }
.principle-list { display: grid; gap: 12px; }
.principle-card { display: flex; gap: 12px; align-items: flex-start; }
.check { flex: 0 0 28px; width: 28px; height: 28px; border-radius: 50%; background: var(--primary-soft); color: var(--primary-dark); display: grid; place-items: center; font-weight: 900; }
.cta-section {
    width: min(1040px, calc(100% - 32px));
    margin: 0 auto 64px;
    padding: 36px 22px;
    text-align: center;
    border-radius: 30px;
    border: 1px solid var(--line);
    background: linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.95));
    box-shadow: var(--shadow);
}
.cta-section p { max-width: 670px; margin-left: auto; margin-right: auto; }
.doc-hero { padding: 54px 0 24px; }
.doc-hero .narrow { display: grid; gap: 16px; }
.doc-layout { display: grid; gap: 20px; align-items: start; }
.doc-content { display: grid; gap: 18px; }
.doc-content h2 { font-size: 26px; margin-top: 10px; }
.steps-list { display: grid; gap: 12px; margin: 18px 0; }
.step-card { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; }
.note-list { display: grid; gap: 12px; }
.note-list li { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; list-style: none; }
.reading-actions { margin-top: 8px; }
.download-page { text-align: center; }
.download-steps .step-card { text-align: left; }
.faq-list { display: grid; gap: 14px; }
.faq-item summary { cursor: pointer; font-weight: 800; color: var(--ink); }
.faq-item p { margin-top: 10px; }
.site-footer { padding: 46px 0 20px; background: #f3f8ff; border-top: 1px solid var(--line); }
.footer-grid { display: grid; gap: 26px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h3 { font-size: 15px; margin-bottom: 10px; }
.site-footer a:not(.footer-brand) { display: block; color: #51657d; margin: 8px 0; font-size: 14px; }
.footer-bottom { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); }
.footer-bottom p { font-size: 13px; }
.gradient-panel { background: linear-gradient(140deg, #ffffff, #eef7ff); }
.page-split { display: grid; gap: 16px; }
.keyword-soft { color: var(--primary-dark); font-weight: 800; }
@media (min-width: 700px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .category-bento, .scenario-grid, .guide-grid, .download-steps { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1fr; }
}
@media (min-width: 960px) {
    .site-nav { display: flex; }
    .nav-toggle { display: none; }
    .centered-hero { padding-top: 108px; }
    .product-bento { grid-template-columns: 1.35fr .9fr; grid-template-rows: repeat(2, minmax(150px, auto)); }
    .product-main { grid-row: span 2; min-height: 520px; }
    .product-main img { width: 340px; }
    .status-card:nth-child(3) { transform: translateX(34px); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .roadmap { grid-template-columns: repeat(6, 1fr); align-items: stretch; }
    .roadmap-item:nth-child(even) { margin-top: 34px; }
    .category-bento { grid-template-columns: repeat(4, 1fr); grid-auto-flow: dense; }
    .category-card.large { grid-column: span 2; }
    .bento-grid { grid-template-columns: repeat(4, 1fr); grid-auto-flow: dense; }
    .feature-card.large { grid-column: span 2; grid-row: span 2; }
    .feature-card.medium { grid-column: span 2; }
    .security-layout { grid-template-columns: .95fr 1.05fr; }
    .doc-layout { grid-template-columns: minmax(0, 1fr) 310px; }
    .doc-layout.wide-tip { grid-template-columns: 300px minmax(0, 1fr); }
    .page-split { grid-template-columns: repeat(2, 1fr); }
    .section { padding: 76px 0; }
}
@media (max-width: 420px) {
    .container, .narrow, .cta-section { width: min(100% - 24px, 1120px); }
    .status-card, .card, .category-card, .feature-card, .scenario-card, .faq-item, .tip-card, .principle-card, .doc-panel, .step-card { padding: 17px; }
    .download-btn { width: 100%; }
}