:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fba;
    --ink: #102033;
    --muted: #607086;
    --line: #dce8f6;
    --soft: #f4f8fd;
    --soft-blue: #eaf4ff;
    --card: rgba(255,255,255,.86);
    --radius: 22px;
    --shadow: 0 20px 60px rgba(20, 72, 130, .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, #ffffff 0%, #f6fbff 34%, #ffffff 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: 30;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(211,226,243,.72);
}
.nav-shell, .container, .footer-shell {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}
.nav-shell {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo, .footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -.02em;
}
.logo img, .footer-logo img { width: 38px; height: 38px; border-radius: 12px; }
.nav-toggle { display: none; }
.mobile-nav-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--primary-dark);
    font-weight: 700;
    background: #fff;
}
.site-nav {
    position: absolute;
    top: 70px;
    left: 16px;
    right: 16px;
    display: none;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav { display: grid; gap: 4px; }
.site-nav a {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    color: #3b4b60;
    font-size: 14px;
}
.site-nav a:hover, .site-nav a.active { background: var(--soft-blue); color: var(--primary-dark); }
main { min-height: 70vh; }
.section { padding: 54px 0; }
.section-tight { padding: 34px 0; }
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 11px;
    border: 1px solid rgba(70,139,223,.22);
    border-radius: 999px;
    color: var(--primary-dark);
    background: rgba(234,244,255,.72);
    font-size: 13px;
    font-weight: 700;
}
.centered-hero {
    padding: 72px 0 30px;
    text-align: center;
    background:
        radial-gradient(circle at 50% 0%, rgba(70,139,223,.18), transparent 34%),
        linear-gradient(180deg, #fff 0%, #f5fbff 100%);
}
.centered-hero h1 {
    max-width: 940px;
    margin: 18px auto 18px;
    font-size: clamp(38px, 8vw, 78px);
    line-height: 1.05;
    letter-spacing: -.06em;
}
.hero-lead {
    max-width: 780px;
    margin: 0 auto 26px;
    color: var(--muted);
    font-size: 17px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(70,139,223,.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 16px 38px rgba(70,139,223,.32); }
.hero-tags, .tag-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 18px;
}
.hero-tags span, .tag-row span {
    padding: 7px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255,255,255,.72);
    color: #496078;
    font-size: 13px;
}
.product-bento {
    display: grid;
    gap: 16px;
    margin-top: 28px;
}
.product-stage {
    position: relative;
    overflow: hidden;
    min-height: 420px;
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 28px;
    background:
        linear-gradient(135deg, rgba(70,139,223,.16), rgba(255,255,255,.92)),
        radial-gradient(circle at 88% 20%, rgba(70,139,223,.18), transparent 28%);
    box-shadow: var(--shadow);
    display: grid;
    place-items: center;
    padding: 28px;
}
.product-stage img { max-height: 360px; filter: drop-shadow(0 28px 46px rgba(31, 83, 147, .16)); }
.status-card, .mini-card, .capability-card, .category-card, .feature-card, .scenario-card, .faq-item, .doc-card, .note-box, .step-card, .principle-card {
    border: 1px solid rgba(211,226,243,.86);
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: 0 14px 42px rgba(28,84,141,.07);
}
.status-card { padding: 18px; }
.status-card strong, .mini-card strong { display: block; margin-bottom: 4px; }
.status-card p, .mini-card p { margin: 0; color: var(--muted); font-size: 14px; }
.bento-status { display: grid; gap: 14px; }
.section-head { margin-bottom: 24px; }
.section-head h2 {
    margin: 12px 0 10px;
    font-size: clamp(28px, 4.6vw, 48px);
    line-height: 1.15;
    letter-spacing: -.04em;
}
.section-head p { margin: 0; max-width: 720px; color: var(--muted); }
.security-overview, .feature-grid, .scenario-grid, .faq-grid { display: grid; gap: 14px; }
.capability-card { padding: 22px; }
.capability-card .num, .feature-card .num, .category-card .num {
    display: inline-block;
    margin-bottom: 16px;
    color: var(--primary-dark);
    font-weight: 900;
    letter-spacing: .08em;
}
.capability-card h3, .category-card h3, .feature-card h3, .scenario-card h3 { margin: 0 0 8px; font-size: 20px; }
.capability-card p, .category-card p, .feature-card p, .scenario-card p, .faq-item p { margin: 0; color: var(--muted); }
.roadmap {
    position: relative;
    display: grid;
    gap: 14px;
}
.roadmap::before {
    content: "";
    position: absolute;
    left: 18px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: linear-gradient(var(--primary), transparent);
}
.roadmap-step {
    position: relative;
    display: grid;
    grid-template-columns: 38px 1fr;
    gap: 14px;
}
.step-index {
    width: 38px;
    height: 38px;
    border-radius: 999px;
    display: grid;
    place-items: center;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    z-index: 1;
}
.step-card { padding: 18px; }
.step-card h3 { margin: 0 0 6px; }
.step-card p { margin: 0 0 10px; color: var(--muted); }
.text-link { color: var(--primary-dark); font-weight: 800; }
.text-link:hover { text-decoration: underline; }
.category-bento { display: grid; gap: 14px; }
.category-card { padding: 20px; min-height: 154px; display: flex; flex-direction: column; justify-content: space-between; }
.category-nav { display: grid; gap: 12px; }
.bento-grid { display: grid; gap: 14px; }
.feature-card { padding: 22px; min-height: 180px; }
.feature-card.large { background: linear-gradient(145deg, rgba(70,139,223,.14), rgba(255,255,255,.9)); }
.feature-card.small { min-height: 136px; }
.security-layout {
    display: grid;
    gap: 18px;
    align-items: start;
    border: 1px solid rgba(70,139,223,.12);
    border-radius: 30px;
    padding: 24px;
    background: linear-gradient(135deg, #f4f9ff, #ffffff);
}
.security-panel { display: grid; gap: 12px; }
.principle-card { padding: 16px; }
.principle-card strong { display: block; margin-bottom: 4px; }
.principle-card span { color: var(--muted); font-size: 14px; }
.scenario-card { padding: 20px; }
.faq-item { padding: 20px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.cta-section {
    text-align: center;
    padding: 56px 22px;
    border: 1px solid rgba(70,139,223,.14);
    border-radius: 30px;
    background:
        radial-gradient(circle at 50% 0%, rgba(70,139,223,.18), transparent 42%),
        linear-gradient(180deg, #f3f9ff, #fff);
    box-shadow: var(--shadow);
}
.cta-section h2 { margin: 0 0 10px; font-size: clamp(28px, 5vw, 48px); letter-spacing: -.04em; }
.cta-section p { max-width: 660px; margin: 0 auto 22px; color: var(--muted); }
.page-hero {
    padding: 62px 0 26px;
    background: linear-gradient(180deg, #f5fbff, #fff);
}
.page-hero h1 { margin: 14px 0 12px; font-size: clamp(34px, 6vw, 62px); line-height: 1.1; letter-spacing: -.05em; }
.page-hero p { margin: 0; max-width: 760px; color: var(--muted); font-size: 17px; }
.doc-layout { display: grid; gap: 18px; align-items: start; }
.doc-main { display: grid; gap: 16px; }
.doc-card { padding: 22px; }
.doc-card h2 { margin: 0 0 10px; font-size: 24px; }
.doc-card p { margin: 0 0 12px; color: #44546a; }
.doc-card p:last-child { margin-bottom: 0; }
.doc-card ul, .doc-card ol { margin: 0; padding-left: 20px; color: #44546a; }
.doc-aside { display: grid; gap: 14px; }
.note-box { padding: 18px; background: linear-gradient(180deg, #fff, #f6fbff); }
.note-box h3 { margin: 0 0 8px; }
.note-box p, .note-box li { color: var(--muted); }
.note-box ul, .note-box ol { margin: 0; padding-left: 20px; }
.process-steps { display: grid; gap: 12px; counter-reset: steps; }
.process-steps li {
    list-style: none;
    position: relative;
    padding: 14px 14px 14px 48px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
    color: #44546a;
}
.process-steps li::before {
    counter-increment: steps;
    content: counter(steps);
    position: absolute;
    left: 14px;
    top: 14px;
    width: 24px;
    height: 24px;
    display: grid;
    place-items: center;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--primary-dark);
    font-weight: 800;
}
.download-panel { text-align: center; }
.download-panel .download-btn { margin-top: 10px; }
.faq-list { display: grid; gap: 14px; }
.faq-list .faq-item h2 { margin: 0 0 8px; font-size: 20px; }
.site-footer {
    margin-top: 60px;
    border-top: 1px solid var(--line);
    background: #fff;
    color: var(--muted);
}
.footer-shell { display: grid; gap: 24px; padding: 34px 0; }
.footer-shell p { margin: 12px 0 0; max-width: 520px; }
.footer-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.footer-links a { color: #40546c; font-weight: 700; }
.footer-bottom { width: min(1120px, calc(100% - 32px)); margin: 0 auto; padding: 16px 0 26px; font-size: 13px; border-top: 1px solid #eef4fb; }
@media (min-width: 720px) {
    .security-overview, .scenario-grid, .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .category-bento { grid-template-columns: repeat(2, 1fr); }
    .feature-grid, .bento-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-shell { grid-template-columns: 1.4fr 1fr; }
}
@media (min-width: 980px) {
    .mobile-nav-trigger { display: none; }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        background: transparent;
        box-shadow: none;
    }
    .site-nav a { padding: 8px 12px; }
    .centered-hero { padding-top: 96px; }
    .product-bento { grid-template-columns: 1.45fr .9fr; align-items: stretch; }
    .bento-status { grid-template-rows: repeat(4, 1fr); }
    .security-overview { grid-template-columns: repeat(4, 1fr); }
    .roadmap { grid-template-columns: repeat(6, 1fr); gap: 10px; }
    .roadmap::before { left: 7%; right: 7%; top: 19px; width: auto; height: 1px; bottom: auto; }
    .roadmap-step { grid-template-columns: 1fr; grid-template-rows: 38px 1fr; }
    .roadmap-step:nth-child(even) { margin-top: 42px; }
    .category-bento { grid-template-columns: repeat(4, 1fr); grid-auto-flow: dense; }
    .category-card.wide { grid-column: span 2; }
    .category-card.tall { grid-row: span 2; }
    .bento-grid { grid-template-columns: repeat(4, 1fr); grid-auto-flow: dense; }
    .feature-card.large { grid-column: span 2; min-height: 250px; }
    .feature-card.medium { grid-column: span 2; }
    .security-layout { grid-template-columns: 1fr 1fr; padding: 36px; }
    .scenario-grid { grid-template-columns: repeat(5, 1fr); }
    .scenario-card:nth-child(1), .scenario-card:nth-child(2) { grid-column: span 2; }
    .scenario-card:nth-child(3), .scenario-card:nth-child(4), .scenario-card:nth-child(5) { grid-column: span 1; }
    .doc-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .doc-main { max-width: 760px; }
    .footer-links { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 420px) {
    .nav-shell, .container, .footer-shell, .footer-bottom { width: min(100% - 24px, 1120px); }
    .centered-hero { padding-top: 48px; }
    .product-stage { min-height: 330px; padding: 18px; }
    .download-btn { width: 100%; max-width: 280px; }
}