:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(42,104,184);
    --primary-soft: rgba(70,139,223,.12);
    --ink: #112033;
    --muted: #607086;
    --line: #dce8f8;
    --surface: #ffffff;
    --soft-bg: #f4f8ff;
    --card: rgba(255,255,255,.86);
    --radius: 22px;
    --shadow: 0 18px 50px rgba(40,91,151,.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: linear-gradient(180deg, #f7fbff 0%, #ffffff 42%, #f5f9ff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220,232,248,.75);
}
.header-inner, .container, .footer-inner, .footer-bottom {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}
.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand, .footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 760;
    letter-spacing: -.02em;
}
.logo-img, .footer-brand img { width: 34px; height: 34px; border-radius: 12px; }
.brand-text { font-size: 18px; }
.site-nav { display: none; gap: 6px; align-items: center; }
.site-nav a {
    padding: 9px 12px;
    border-radius: 999px;
    color: #506278;
    font-size: 14px;
    transition: .2s ease;
}
.site-nav a:hover, .site-nav a.active { color: var(--primary-dark); background: var(--primary-soft); }
.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--ink);
    width: 42px;
    height: 42px;
    border-radius: 14px;
    font-size: 22px;
}
.site-nav.nav-open {
    display: grid;
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    border-radius: 18px;
    padding: 10px;
}
.site-nav.nav-open a { padding: 12px 14px; }
.section { padding: 56px 0; }
.section-tight { padding: 36px 0; }
.eyebrow, .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;
}
.centered-hero {
    padding: 76px 0 42px;
    text-align: center;
    position: relative;
}
.centered-hero:before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 0%, rgba(70,139,223,.18), transparent 48%);
    pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; width: min(880px, calc(100% - 32px)); margin: 0 auto; }
h1, h2, h3 { line-height: 1.18; letter-spacing: -.04em; margin: 0 0 14px; }
h1 { font-size: clamp(34px, 8vw, 64px); }
h2 { font-size: clamp(26px, 4.6vw, 42px); }
h3 { font-size: 21px; }
p { margin: 0 0 16px; color: var(--muted); }
.hero-lead { font-size: clamp(16px, 2.4vw, 20px); max-width: 760px; margin: 0 auto 24px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 760;
    box-shadow: 0 14px 26px rgba(70,139,223,.25);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    border: none;
    cursor: pointer;
}
.download-btn:hover { transform: translateY(-1px); background: var(--primary-dark); box-shadow: 0 16px 34px rgba(70,139,223,.3); }
.security-tags { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.security-tags span {
    padding: 7px 12px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,.75);
    border-radius: 999px;
    color: #51647b;
    font-size: 13px;
}
.product-bento {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    align-items: stretch;
}
.product-card, .glass-card, .content-card, .category-card, .feature-card, .scenario-card, .faq-item, .note-card, .doc-panel {
    background: var(--card);
    border: 1px solid rgba(220,232,248,.9);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.product-card {
    padding: 22px;
    display: grid;
    place-items: center;
    min-height: 440px;
    background: linear-gradient(145deg, #ffffff, #ecf5ff);
    position: relative;
    overflow: hidden;
}
.product-card:before {
    content: "";
    position: absolute;
    width: 260px;
    height: 260px;
    border-radius: 999px;
    background: rgba(70,139,223,.14);
    filter: blur(18px);
}
.product-card img { width: min(300px, 72vw); position: relative; z-index: 1; border-radius: 32px; }
.status-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.status-card { padding: 18px; }
.status-card strong { display: block; margin-bottom: 6px; font-size: 16px; }
.status-card small { color: var(--muted); }
.section-head { display: flex; flex-direction: column; gap: 12px; margin-bottom: 22px; }
.section-head p { max-width: 720px; }
.capability-grid, .scenario-grid, .guide-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.content-card, .scenario-card, .category-card, .feature-card, .note-card, .doc-panel { padding: 22px; }
.icon-dot {
    width: 36px;
    height: 36px;
    border-radius: 14px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    display: grid;
    place-items: center;
    font-weight: 800;
    margin-bottom: 14px;
}
.card-link { color: var(--primary-dark); font-weight: 760; display: inline-flex; margin-top: 8px; }
.roadmap {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    counter-reset: step;
}
.step-card {
    position: relative;
    padding: 20px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
}
.step-num {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    margin-bottom: 12px;
}
.category-bento, .bento-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}
.feature-card.large, .category-card.large {
    background: linear-gradient(145deg, #fff, #edf6ff);
}
.security-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
    align-items: start;
}
.security-principles { display: grid; gap: 12px; }
.principle {
    padding: 16px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}
.principle strong { display: block; margin-bottom: 4px; }
.faq-list { display: grid; gap: 12px; }
.faq-item { padding: 20px; }
.faq-item summary { cursor: pointer; font-weight: 760; color: var(--ink); }
.faq-item p { margin-top: 12px; }
.cta-section {
    margin: 26px 0 70px;
    text-align: center;
    padding: 34px 20px;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.95));
    border: 1px solid var(--line);
}
.page-hero {
    padding: 58px 0 30px;
    background: radial-gradient(circle at top right, rgba(70,139,223,.15), transparent 42%);
}
.page-hero .container { max-width: 900px; }
.doc-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: start;
}
.doc-main { max-width: 760px; }
.doc-main .download-btn { margin-top: 14px; }
.check-list, .clean-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.check-list li, .clean-list li {
    padding: 13px 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    color: #51647b;
}
.check-list li:before { content: "✓ "; color: var(--primary-dark); font-weight: 800; }
.process-steps { display: grid; gap: 12px; margin: 20px 0; }
.process-step {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}
.process-step span {
    width: 34px;
    height: 34px;
    border-radius: 12px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    display: grid;
    place-items: center;
    font-weight: 800;
}
.site-footer {
    background: #f3f8ff;
    border-top: 1px solid var(--line);
    padding: 38px 0 18px;
}
.footer-inner { display: grid; grid-template-columns: 1fr; gap: 22px; }
.footer-brand img { width: 32px; height: 32px; }
.footer-inner p { max-width: 620px; font-size: 14px; }
.footer-links { display: grid; gap: 10px; }
.footer-links a { color: #506278; }
.footer-bottom { color: #738299; font-size: 13px; padding-top: 20px; }
.table-like { display: grid; gap: 10px; }
.info-row { display: grid; grid-template-columns: 1fr; gap: 6px; padding: 15px; background: #fff; border: 1px solid var(--line); border-radius: 16px; }
.info-row strong { color: var(--ink); }
@media (min-width: 680px) {
    .capability-grid, .scenario-grid, .guide-grid { grid-template-columns: repeat(2, 1fr); }
    .category-bento { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1.4fr .6fr; }
    .info-row { grid-template-columns: 180px 1fr; }
}
@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .site-nav { display: flex; }
    .centered-hero { padding: 104px 0 54px; }
    .product-bento { grid-template-columns: 1.35fr .65fr; gap: 20px; }
    .product-card { min-height: 520px; }
    .status-grid { grid-template-columns: 1fr; }
    .section-head { flex-direction: row; align-items: end; justify-content: space-between; }
    .roadmap { grid-template-columns: repeat(6, 1fr); gap: 10px; }
    .step-card:nth-child(even) { transform: translateY(24px); }
    .category-bento { grid-template-columns: repeat(4, 1fr); }
    .category-card.large { grid-column: span 2; }
    .bento-grid { grid-template-columns: repeat(6, 1fr); }
    .feature-card.large { grid-column: span 3; min-height: 250px; }
    .feature-card.medium { grid-column: span 2; }
    .feature-card.small { grid-column: span 1; }
    .security-layout { grid-template-columns: 1.05fr .95fr; gap: 30px; }
    .doc-layout { grid-template-columns: minmax(0, 760px) 320px; gap: 28px; }
    .doc-side { position: sticky; top: 96px; }
}