:root {
    --primary: rgb(70,139,223);
    --primary-dark: #235fa8;
    --primary-soft: #eaf4ff;
    --ink: #13243a;
    --muted: #66758a;
    --line: #d9e6f5;
    --surface: #ffffff;
    --surface-soft: #f6faff;
    --shadow: 0 18px 45px rgba(52, 111, 179, 0.12);
    --radius-lg: 28px;
    --radius-md: 22px;
    --radius-sm: 16px;
}
* { 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 36%, #f8fbff 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, 0.86);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(217, 230, 245, 0.72);
}
.nav-shell {
    max-width: 1180px;
    margin: 0 auto;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.02em; color: var(--ink); }
.logo img { width: 34px; height: 34px; border-radius: 12px; }
.site-nav { display: none; flex-direction: column; position: absolute; left: 16px; right: 16px; top: 66px; padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.site-nav a { padding: 10px 12px; color: #40526a; border-radius: 12px; font-size: 15px; }
.site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.nav-toggle { display: none; }
.nav-toggle-label { width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 14px; display: grid; place-content: center; gap: 5px; cursor: pointer; background: #fff; }
.nav-toggle-label span { width: 18px; height: 2px; background: var(--ink); border-radius: 2px; display: block; }
.nav-toggle:checked ~ .site-nav { display: flex; }
.container, .section-inner { width: min(100% - 36px, 1120px); margin: 0 auto; }
.narrow { width: min(100% - 36px, 820px); margin: 0 auto; }
section { padding: 58px 0; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    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 34px;
    text-align: center;
    background: radial-gradient(circle at 50% 0%, rgba(70,139,223,0.18), transparent 44%), linear-gradient(180deg, #f6fbff 0%, rgba(255,255,255,0) 100%);
}
h1 { font-size: clamp(36px, 7vw, 76px); line-height: 1.05; margin: 18px auto; letter-spacing: -0.055em; max-width: 980px; }
h2 { font-size: clamp(27px, 4vw, 44px); line-height: 1.18; margin: 0 0 14px; letter-spacing: -0.04em; }
h3 { font-size: 21px; margin: 0 0 8px; letter-spacing: -0.02em; }
p { margin: 0 0 16px; color: var(--muted); }
.lead { font-size: clamp(17px, 2.2vw, 21px); max-width: 760px; margin: 0 auto 26px; color: #53657b; }
.download-btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(70,139,223,0.24);
    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 30px rgba(70,139,223,0.28); }
.security-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 18px; }
.security-tags span { padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,0.8); color: #466079; font-size: 14px; }
.product-bento { padding-top: 24px; }
.product-stage {
    display: grid;
    gap: 16px;
    align-items: center;
    background: linear-gradient(135deg, #ffffff 0%, #edf6ff 100%);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 18px;
    box-shadow: var(--shadow);
}
.phone-card { background: linear-gradient(180deg, #eef7ff, #fff); border-radius: 28px; border: 1px solid #d7e8f8; padding: 22px; display: grid; place-items: center; min-height: 360px; }
.phone-card img { width: min(270px, 74vw); filter: drop-shadow(0 20px 45px rgba(39, 96, 152, .16)); }
.status-stack { display: grid; gap: 14px; }
.status-card, .feature-card, .category-card, .scenario-card, .faq-card, .principle-card, .info-card, .step-card, .doc-panel, .download-panel {
    background: rgba(255,255,255,0.9);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 10px 26px rgba(52,111,179,0.07);
}
.status-card strong { display: block; margin-bottom: 5px; color: var(--ink); }
.status-card p { font-size: 14px; margin: 0; }
.section-heading { display: flex; flex-direction: column; gap: 8px; margin-bottom: 24px; }
.section-heading.center { text-align: center; align-items: center; }
.capability-grid, .scenario-grid, .faq-grid { display: grid; gap: 16px; }
.feature-card .icon, .category-card .icon, .scenario-card .icon { width: 42px; height: 42px; display: grid; place-items: center; background: var(--primary-soft); color: var(--primary-dark); border-radius: 14px; font-weight: 900; margin-bottom: 14px; }
.roadmap { display: grid; gap: 14px; position: relative; }
.roadmap-step { position: relative; display: grid; grid-template-columns: 46px 1fr; gap: 14px; align-items: start; padding: 18px; border: 1px solid var(--line); background: #fff; border-radius: 20px; box-shadow: 0 10px 24px rgba(52,111,179,0.06); }
.roadmap-step .num { width: 42px; height: 42px; border-radius: 15px; background: var(--primary); color: #fff; display: grid; place-items: center; font-weight: 900; }
.roadmap-step a, .text-link { color: var(--primary-dark); font-weight: 800; }
.category-bento, .bento-grid { display: grid; gap: 16px; }
.category-card { display: flex; flex-direction: column; min-height: 168px; }
.category-card a { margin-top: auto; color: var(--primary-dark); font-weight: 800; }
.bento-grid .feature-card { min-height: 170px; }
.feature-card.large { background: linear-gradient(135deg, #ffffff 0%, #eef7ff 100%); }
.security-layout { display: grid; gap: 18px; align-items: center; }
.principle-list { display: grid; gap: 12px; }
.principle-card { display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; }
.principle-card span { width: 34px; height: 34px; border-radius: 12px; background: var(--primary-soft); color: var(--primary-dark); display: grid; place-items: center; font-weight: 900; }
.cta-section { padding: 64px 0; }
.cta-box { text-align: center; border-radius: var(--radius-lg); padding: 38px 20px; border: 1px solid var(--line); background: linear-gradient(135deg, #edf7ff 0%, #fff 70%); box-shadow: var(--shadow); }
.page-hero { padding: 64px 0 26px; background: linear-gradient(180deg, #f2f8ff, #fff); }
.page-hero h1 { text-align: left; margin-left: 0; font-size: clamp(34px, 6vw, 58px); max-width: 860px; }
.page-hero .lead { margin-left: 0; max-width: 760px; }
.doc-layout { display: grid; gap: 18px; align-items: start; }
.doc-content { display: grid; gap: 18px; }
.doc-panel h2 { font-size: 26px; }
.doc-panel ul, .doc-panel ol { margin: 10px 0 0; padding-left: 20px; color: var(--muted); }
.doc-panel li { margin: 7px 0; }
.tip-list { display: grid; gap: 10px; padding: 0; list-style: none; }
.tip-list li { padding: 12px 14px; background: var(--surface-soft); border-radius: 14px; border: 1px solid var(--line); color: #4b5f76; }
.process-steps { display: grid; gap: 12px; counter-reset: step; }
.process-steps .process-item { border: 1px solid var(--line); border-radius: 18px; background: #fff; padding: 18px; }
.process-item strong { display: block; color: var(--ink); margin-bottom: 6px; }
.download-panel { text-align: center; }
.faq-list { display: grid; gap: 14px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 18px 20px; }
.faq-item summary { cursor: pointer; font-weight: 800; color: var(--ink); }
.faq-item p { margin-top: 12px; }
.footer-inner { width: min(100% - 36px, 1120px); margin: 0 auto; padding: 38px 0; display: grid; gap: 24px; }
.site-footer { background: #f2f7fd; border-top: 1px solid var(--line); margin-top: 30px; }
.footer-brand { display: flex; gap: 14px; align-items: flex-start; }
.footer-brand img { width: 42px; height: 42px; border-radius: 14px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; }
.footer-links a { padding: 8px 12px; background: #fff; border: 1px solid var(--line); border-radius: 999px; color: #52677f; font-size: 14px; }
.footer-bottom { border-top: 1px solid var(--line); text-align: center; padding: 16px 18px 24px; color: #718096; font-size: 13px; }
.table-like { display: grid; gap: 10px; }
.table-like div { padding: 12px 14px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface-soft); }
.note { padding: 16px; background: #f4f9ff; border: 1px solid var(--line); border-radius: 18px; color: #4b5f76; }
@media (min-width: 700px) {
    .capability-grid, .scenario-grid, .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .category-bento { grid-template-columns: repeat(2, 1fr); }
    .product-stage { padding: 28px; }
}
@media (min-width: 960px) {
    .nav-toggle-label { display: none; }
    .site-nav { display: flex; flex-direction: row; position: static; padding: 0; background: transparent; border: 0; box-shadow: none; align-items: center; gap: 4px; }
    .site-nav a { font-size: 14px; }
    .centered-hero { padding: 106px 0 48px; }
    .product-stage { grid-template-columns: 1.3fr .9fr; gap: 24px; }
    .status-stack { grid-template-columns: 1fr 1fr; }
    .status-card:nth-child(2), .status-card:nth-child(4) { transform: translateY(18px); }
    .capability-grid { grid-template-columns: repeat(4, 1fr); }
    .roadmap { grid-template-columns: repeat(6, 1fr); align-items: stretch; }
    .roadmap:before { content: ''; position: absolute; left: 7%; right: 7%; top: 38px; height: 2px; background: linear-gradient(90deg, transparent, rgba(70,139,223,0.35), transparent); }
    .roadmap-step { grid-template-columns: 1fr; padding: 16px; min-height: 230px; }
    .roadmap-step:nth-child(even) { transform: translateY(28px); }
    .category-bento { grid-template-columns: repeat(4, 1fr); }
    .category-card.big { grid-column: span 2; min-height: 220px; }
    .bento-grid { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(170px, auto); }
    .bento-grid .large { grid-column: span 2; grid-row: span 2; }
    .bento-grid .medium { grid-column: span 2; }
    .security-layout { grid-template-columns: 1.05fr .95fr; gap: 34px; }
    .doc-layout { grid-template-columns: minmax(0, 1fr) 320px; gap: 24px; }
    .doc-sidebar { position: sticky; top: 94px; }
    .footer-inner { grid-template-columns: 1fr auto; align-items: center; }
}
@media (max-width: 420px) {
    .container, .section-inner, .narrow { width: min(100% - 28px, 1120px); }
    section { padding: 44px 0; }
    .status-card, .feature-card, .category-card, .scenario-card, .faq-card, .principle-card, .info-card, .step-card, .doc-panel, .download-panel { padding: 18px; }
    .download-btn { width: 100%; }
}