:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(42,95,166);
    --primary-soft: rgba(70,139,223,.12);
    --bg: #f6f9ff;
    --panel: #ffffff;
    --text: #142033;
    --muted: #66758c;
    --line: #dfe9f7;
    --blue-50: #eef6ff;
    --blue-100: #e6f0fd;
    --shadow: 0 18px 60px rgba(31, 86, 148, .10);
    --radius: 22px;
    --max: 1160px;
}

* { 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(--text);
    background:
        radial-gradient(circle at 15% 5%, rgba(70,139,223,.12), transparent 28rem),
        linear-gradient(180deg, #ffffff 0%, var(--bg) 52%, #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: 30;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(223,233,247,.78);
}
.header-inner {
    max-width: var(--max);
    margin: 0 auto;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; }
.logo-img { width: 36px; height: 36px; border-radius: 12px; }
.brand-text { font-size: 18px; color: #11243d; }
.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
}
.nav-toggle span { width: 18px; height: 2px; background: var(--text); border-radius: 4px; }
.site-nav {
    position: absolute;
    left: 18px;
    right: 18px;
    top: 68px;
    display: none;
    flex-direction: column;
    padding: 12px;
    background: rgba(255,255,255,.98);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.site-nav.is-open { display: flex; }
.site-nav a {
    padding: 11px 12px;
    border-radius: 12px;
    color: var(--muted);
    font-size: 14px;
}
.site-nav a.active,
.site-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }

.container, .section { max-width: var(--max); margin: 0 auto; padding: 0 18px; }
.section { padding-top: 70px; padding-bottom: 10px; }
.section-head { max-width: 760px; margin-bottom: 28px; }
.section-eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    background: var(--primary-soft);
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
}
h1, h2, h3 { line-height: 1.18; margin: 0 0 14px; color: #102033; }
h1 { font-size: clamp(34px, 8vw, 72px); letter-spacing: -.05em; }
h2 { font-size: clamp(26px, 5vw, 42px); letter-spacing: -.035em; }
h3 { font-size: 20px; letter-spacing: -.015em; }
p { margin: 0 0 14px; color: var(--muted); }
.lead { font-size: 17px; color: #4d5f77; }
.center { text-align: center; margin-left: auto; margin-right: auto; }

.centered-hero { padding: 78px 18px 34px; text-align: center; max-width: 960px; margin: 0 auto; }
.centered-hero p { max-width: 760px; margin-left: auto; margin-right: auto; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    margin-top: 16px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    border: 1px solid rgba(70,139,223,.12);
    box-shadow: 0 16px 36px rgba(70,139,223,.26);
    transition: transform .18s ease, box-shadow .18s ease;
}
.download-btn:hover { transform: translateY(-1px); box-shadow: 0 20px 42px rgba(70,139,223,.32); }
.safe-tags { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }
.safe-tags span { padding: 8px 12px; border-radius: 999px; background: #fff; border: 1px solid var(--line); color: #4e6179; font-size: 13px; }

.product-bento {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    align-items: stretch;
}
.product-main, .status-card, .card, .category-card, .feature-card, .scenario-card, .doc-card, .faq-item, .security-panel, .principle-card {
    background: rgba(255,255,255,.92);
    border: 1px solid rgba(223,233,247,.94);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.product-main {
    padding: 20px;
    overflow: hidden;
    min-height: 360px;
    display: grid;
    place-items: center;
    background:
        linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.95)),
        #fff;
}
.product-main img { max-height: 520px; margin: 0 auto; filter: drop-shadow(0 26px 42px rgba(31,86,148,.16)); }
.status-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.status-card { padding: 18px; }
.status-card strong { display: block; margin-bottom: 8px; color: #1c3453; }
.status-card small { color: var(--muted); }
.status-dot { width: 10px; height: 10px; background: var(--primary); border-radius: 50%; display: inline-block; margin-right: 8px; }

.ability-grid, .scenario-grid, .faq-preview, .page-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.card, .scenario-card, .doc-card { padding: 22px; }
.card .icon, .feature-card .icon { width: 42px; height: 42px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary-dark); border-radius: 14px; margin-bottom: 14px; font-weight: 900; }

.roadmap {
    position: relative;
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}
.roadmap-step {
    position: relative;
    padding: 20px 20px 20px 72px;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: 0 12px 34px rgba(31,86,148,.07);
}
.roadmap-step::before {
    content: attr(data-step);
    position: absolute;
    left: 20px;
    top: 20px;
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    border-radius: 13px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}
.text-link { display: inline-flex; margin-top: 8px; color: var(--primary-dark); font-weight: 800; }

.category-bento { display: grid; grid-template-columns: 1fr; gap: 16px; }
.category-card { padding: 22px; min-height: 160px; }
.category-card .meta { color: var(--primary-dark); font-size: 13px; font-weight: 800; margin-bottom: 8px; }

.bento-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.feature-card { padding: 24px; min-height: 180px; }
.feature-card.large { background: linear-gradient(135deg, rgba(70,139,223,.14), #fff 55%); }
.feature-card.small { min-height: 140px; }

.security-layout { display: grid; grid-template-columns: 1fr; gap: 20px; align-items: start; }
.security-panel { padding: 22px; }
.security-list { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.security-list li { padding: 13px 14px; border-radius: 14px; background: var(--blue-50); color: #34506c; }

.cta-section {
    margin: 70px auto;
    max-width: var(--max);
    padding: 44px 20px;
    text-align: center;
    border-radius: 28px;
    border: 1px solid rgba(70,139,223,.16);
    background: linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.96));
    box-shadow: var(--shadow);
}
.cta-section p { max-width: 680px; margin-left: auto; margin-right: auto; }

.page-hero { max-width: 920px; margin: 0 auto; padding: 72px 18px 28px; text-align: center; }
.page-hero .badge { margin-bottom: 16px; }
.reading-layout { max-width: var(--max); margin: 0 auto; padding: 20px 18px 72px; display: grid; grid-template-columns: 1fr; gap: 18px; }
.article-body { display: grid; gap: 18px; }
.article-body .doc-card { box-shadow: 0 10px 30px rgba(31,86,148,.06); }
.article-body ul, .article-body ol { margin: 10px 0 0; padding-left: 20px; color: #51647d; }
.aside-stack { display: grid; gap: 16px; }
.tip-card { background: var(--blue-50); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.step-list { display: grid; gap: 12px; margin-top: 10px; }
.step-box { padding: 16px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
.step-box strong { color: #1e3554; }

.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 18px 20px; }
details.faq-item summary { cursor: pointer; font-weight: 800; color: #1b334f; }
details.faq-item p { margin-top: 12px; }

.site-footer { border-top: 1px solid var(--line); background: rgba(255,255,255,.82); }
.footer-inner { max-width: var(--max); margin: 0 auto; padding: 34px 18px; display: grid; grid-template-columns: 1fr; gap: 24px; }
.footer-brand p { max-width: 420px; margin-top: 12px; }
.footer-links { display: grid; grid-template-columns: 1fr; gap: 18px; }
.footer-links div { display: grid; gap: 8px; }
.footer-links strong { color: #1a314d; }
.footer-links a { color: var(--muted); font-size: 14px; }
.footer-bottom { text-align: center; padding: 18px; color: var(--muted); border-top: 1px solid var(--line); font-size: 13px; }

@media (min-width: 700px) {
    .ability-grid, .scenario-grid, .faq-preview, .page-grid { grid-template-columns: repeat(2, 1fr); }
    .category-bento { grid-template-columns: repeat(2, 1fr); }
    .footer-links { grid-template-columns: repeat(3, 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;
        gap: 4px;
    }
    .site-nav a { padding: 9px 12px; }
    .centered-hero { padding-top: 110px; }
    .product-bento { grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr); }
    .status-grid { grid-template-columns: 1fr; }
    .ability-grid { grid-template-columns: repeat(4, 1fr); }
    .roadmap { grid-template-columns: repeat(3, 1fr); }
    .roadmap-step:nth-child(2), .roadmap-step:nth-child(5) { transform: translateY(22px); }
    .category-bento { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(150px, auto); }
    .category-card.wide { grid-column: span 2; }
    .bento-grid { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(150px, auto); }
    .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; gap: 36px; }
    .scenario-grid { grid-template-columns: repeat(5, 1fr); }
    .scenario-card { min-height: 210px; }
    .scenario-card:nth-child(1), .scenario-card:nth-child(2) { grid-column: span 2; }
    .faq-preview { grid-template-columns: repeat(2, 1fr); }
    .reading-layout { grid-template-columns: minmax(0, 1fr) 320px; gap: 26px; }
    .article-body { max-width: 780px; }
    .footer-inner { grid-template-columns: .9fr 1.1fr; align-items: start; }
}