:root {
    --primary: rgb(70,139,223);
    --primary-soft: rgba(70,139,223,.12);
    --primary-mid: rgba(70,139,223,.22);
    --ink: #0f2238;
    --muted: #62748c;
    --line: #dce8f7;
    --card: rgba(255,255,255,.92);
    --soft: #f4f8fd;
    --radius: 24px;
    --shadow: 0 18px 48px rgba(37, 77, 124, .10);
}
* { 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:
        radial-gradient(circle at top left, rgba(70,139,223,.16), transparent 32rem),
        linear-gradient(180deg, #f7fbff 0%, #ffffff 36%, #f7fbff 100%);
    line-height: 1.72;
    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; }
.section { padding: 64px 0; }
.section-tight { padding: 42px 0; }
.section-title { max-width: 760px; margin: 0 auto 28px; text-align: center; }
.section-title.left { margin-left: 0; text-align: left; }
.section-kicker, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .02em;
}
h1, h2, h3 { line-height: 1.22; margin: 0 0 14px; letter-spacing: -.02em; }
h1 { font-size: clamp(34px, 8vw, 68px); }
h2 { font-size: clamp(26px, 4.8vw, 42px); }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
ul, ol { margin: 0; padding-left: 20px; color: var(--muted); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(213,228,246,.76);
}
.nav-shell {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #10263e; white-space: nowrap; }
.logo { width: 38px; height: 38px; border-radius: 12px; box-shadow: 0 8px 20px rgba(70,139,223,.18); }
.site-nav { display: none; gap: 8px; align-items: center; }
.site-nav a { padding: 10px 12px; border-radius: 999px; color: #496179; font-size: 14px; }
.site-nav a:hover { color: var(--primary); background: var(--primary-soft); }
.nav-toggle { border: 1px solid var(--line); background: #fff; border-radius: 14px; width: 42px; height: 42px; font-size: 20px; color: var(--ink); }
.site-nav.is-open {
    display: grid;
    position: absolute;
    top: 72px;
    left: 14px;
    right: 14px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.centered-hero { padding: 86px 0 42px; text-align: center; }
.hero-copy { max-width: 880px; margin: 0 auto; }
.hero-copy p { font-size: 18px; max-width: 740px; margin-left: auto; margin-right: auto; }
.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 16px 32px rgba(70,139,223,.25);
    transition: transform .18s ease, box-shadow .18s ease;
    border: 0;
    cursor: pointer;
    white-space: nowrap;
}
.download-btn:hover { transform: translateY(-1px); box-shadow: 0 20px 36px rgba(70,139,223,.32); }
.trust-tags { margin-top: 18px; display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.trust-tags span { padding: 8px 12px; border-radius: 999px; background: #fff; border: 1px solid var(--line); color: #365773; font-size: 14px; }
.product-bento {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
    align-items: stretch;
    margin-top: 36px;
}
.product-main-card {
    position: relative;
    min-height: 420px;
    border-radius: 32px;
    overflow: hidden;
    background: linear-gradient(145deg, rgba(255,255,255,.94), rgba(238,246,255,.98));
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    display: grid;
    place-items: center;
    padding: 32px;
}
.product-main-card:before {
    content: "";
    position: absolute;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(70,139,223,.28), transparent 68%);
    filter: blur(2px);
}
.product-main-card img { position: relative; max-height: 360px; object-fit: contain; filter: drop-shadow(0 24px 34px rgba(15,34,56,.16)); }
.status-stack { display: grid; gap: 14px; }
.status-card, .card, .category-card, .feature-card, .scenario-card, .principle-card, .faq-item, .doc-card, .step-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 12px 34px rgba(37, 77, 124, .06);
}
.status-card { padding: 18px; }
.status-card strong { display: block; font-size: 16px; margin-bottom: 4px; color: #10263e; }
.status-card span { color: var(--muted); font-size: 14px; }
.ability-grid, .scenario-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.card { padding: 22px; }
.icon-dot { width: 34px; height: 34px; border-radius: 12px; background: var(--primary-soft); display: grid; place-items: center; color: var(--primary); font-weight: 900; margin-bottom: 14px; }
.roadmap { position: relative; display: grid; gap: 16px; margin-top: 28px; }
.roadmap:before { content: ""; position: absolute; left: 18px; top: 18px; bottom: 18px; width: 2px; background: var(--primary-mid); }
.road-step { position: relative; display: grid; grid-template-columns: 40px 1fr; gap: 14px; }
.road-num { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; background: var(--primary); color: #fff; font-weight: 900; z-index: 1; box-shadow: 0 10px 22px rgba(70,139,223,.22); }
.road-body { padding: 18px; border-radius: 22px; background: #fff; border: 1px solid var(--line); }
.road-body a, .text-link { color: var(--primary); font-weight: 800; }
.category-bento, .bento-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.category-card, .feature-card, .scenario-card { padding: 22px; transition: transform .18s ease, border-color .18s ease; }
.category-card:hover, .scenario-card:hover { transform: translateY(-2px); border-color: rgba(70,139,223,.38); }
.category-card .arrow, .scenario-card .arrow { color: var(--primary); font-weight: 800; }
.feature-card.large { background: linear-gradient(145deg, #fff, #eef6ff); }
.feature-card.small { min-height: 150px; }
.security-layout { display: grid; gap: 22px; align-items: start; }
.principle-list { display: grid; gap: 12px; }
.principle-card { padding: 18px; display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; }
.principle-card b { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 12px; background: var(--primary-soft); color: var(--primary); }
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 20px; }
.faq-item summary { cursor: pointer; font-weight: 800; color: #10263e; }
.faq-item p { margin-top: 12px; }
.cta-section { padding: 58px 0 78px; }
.cta-card { text-align: center; padding: 34px 22px; border-radius: 32px; background: linear-gradient(145deg, rgba(70,139,223,.12), rgba(255,255,255,.94)); border: 1px solid var(--line); box-shadow: var(--shadow); }
.doc-hero { padding: 58px 0 26px; }
.doc-hero-inner { max-width: 860px; }
.doc-hero p { font-size: 17px; }
.doc-layout { display: grid; gap: 20px; align-items: start; }
.doc-content { display: grid; gap: 18px; }
.doc-card { padding: 24px; }
.doc-card h2 { font-size: 26px; }
.doc-note { padding: 20px; border-radius: 22px; background: linear-gradient(145deg, var(--primary-soft), #fff); border: 1px solid var(--line); }
.check-list { display: grid; gap: 10px; padding-left: 0; list-style: none; }
.check-list li { padding-left: 28px; position: relative; color: var(--muted); }
.check-list li:before { content: "✓"; position: absolute; left: 0; color: var(--primary); font-weight: 900; }
.process-steps { display: grid; gap: 12px; counter-reset: steps; }
.process-steps .step-card { padding: 18px; counter-increment: steps; position: relative; }
.process-steps .step-card:before { content: counter(steps); width: 30px; height: 30px; border-radius: 10px; display: inline-grid; place-items: center; margin-right: 8px; background: var(--primary); color: #fff; font-weight: 900; }
.meta-grid { display: grid; gap: 14px; }
.reader-narrow { max-width: 850px; margin: 0 auto; }
.download-panel { text-align: center; }
.site-footer { margin-top: 40px; background: #f1f7ff; border-top: 1px solid var(--line); }
.footer-grid { padding: 38px 0; display: grid; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 900; margin-bottom: 10px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h2 { font-size: 16px; margin-bottom: 10px; }
.site-footer a { display: block; color: var(--muted); margin: 6px 0; }
.footer-bottom { text-align: center; padding: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.table-like { display: grid; gap: 10px; }
.table-like div { display: grid; gap: 4px; padding: 14px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
@media (min-width: 680px) {
    .ability-grid, .scenario-grid, .meta-grid { grid-template-columns: repeat(2, 1fr); }
    .category-bento { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}
@media (min-width: 960px) {
    .nav-toggle { display: none; }
    .site-nav { display: flex; }
    .centered-hero { padding-top: 118px; }
    .product-bento { grid-template-columns: minmax(0, 1.7fr) minmax(280px, .85fr); }
    .ability-grid { grid-template-columns: repeat(4, 1fr); }
    .roadmap { grid-template-columns: repeat(6, 1fr); align-items: start; }
    .roadmap:before { left: 7%; right: 7%; top: 19px; width: auto; height: 2px; bottom: auto; }
    .road-step { grid-template-columns: 1fr; gap: 12px; }
    .road-step:nth-child(even) { margin-top: 48px; }
    .category-bento { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(155px, auto); }
    .category-card.big { grid-column: span 2; grid-row: span 2; }
    .category-card.wide { grid-column: span 2; }
    .bento-grid { grid-template-columns: repeat(6, 1fr); }
    .feature-card.large { grid-column: span 3; min-height: 260px; }
    .feature-card.medium { grid-column: span 2; }
    .feature-card.small { grid-column: span 1; }
    .security-layout { grid-template-columns: .9fr 1.1fr; }
    .doc-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .doc-aside { position: sticky; top: 96px; }
    .scenario-grid { grid-template-columns: repeat(5, 1fr); }
    .scenario-card { min-height: 210px; }
}