:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --blue-50: #f3f8ff;
    --blue-100: #e7f1ff;
    --line: #dfeaf7;
    --text: #10233f;
    --muted: #5f7088;
    --soft: #f8fbff;
    --white: #ffffff;
    --radius: 22px;
    --shadow: 0 16px 46px rgba(31, 95, 174, .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(--text);
    background: linear-gradient(180deg, #f7fbff 0%, #ffffff 38%, #f8fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(100% - 32px, 1160px); margin: 0 auto; }
.container.narrow { width: min(100% - 32px, 820px); }
.section { padding: 58px 0; }
.gradient-bg { background: radial-gradient(circle at 50% 0%, rgba(70,139,223,.18), transparent 36%), linear-gradient(180deg, #f4f9ff 0%, #fff 100%); }
.soft-bg { background: linear-gradient(180deg, #f7fbff 0%, #eef6ff 100%); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.86);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(223,234,247,.78);
}
.nav-wrap {
    width: min(100% - 28px, 1160px);
    min-height: 68px;
    margin: 0 auto;
    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; }
.nav-trigger { width: 42px; height: 42px; display: grid; place-content: center; gap: 5px; cursor: pointer; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.nav-trigger span { display: block; width: 18px; height: 2px; background: var(--text); border-radius: 2px; }
.nav-menu {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.nav-menu a { display: block; padding: 12px 14px; color: var(--muted); border-radius: 12px; }
.nav-menu a:hover { color: var(--primary-dark); background: var(--blue-50); }
.nav-toggle:checked ~ .nav-menu { display: block; }
.centered-hero { padding: 82px 0 34px; text-align: center; }
.hero-inner { max-width: 930px; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .05em;
    text-transform: uppercase;
    background: rgba(70,139,223,.10);
    border: 1px solid rgba(70,139,223,.14);
    padding: 6px 12px;
    border-radius: 999px;
    margin: 0 0 16px;
}
h1, h2, h3 { line-height: 1.2; margin: 0; color: var(--text); }
h1 { font-size: clamp(34px, 9vw, 68px); letter-spacing: -.06em; }
h2 { font-size: clamp(28px, 5.5vw, 44px); letter-spacing: -.04em; }
h3 { font-size: 20px; letter-spacing: -.02em; }
p { margin: 0; color: var(--muted); }
.hero-desc { max-width: 760px; margin: 22px auto 26px; font-size: 17px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: rgb(70,139,223);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(70,139,223,.24);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
    border: none;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 36px rgba(70,139,223,.28); }
.trust-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 22px; }
.trust-tags span { padding: 8px 12px; border-radius: 999px; background: #fff; border: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.product-showcase { padding-top: 28px; }
.product-bento { display: grid; gap: 18px; }
.glass-card, .product-card, .status-card, .feature-grid article, .category-card, .bento-card, .scenario-card, .side-card, .faq-item, .principle-list div {
    background: rgba(255,255,255,.88);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    border-radius: var(--radius);
}
.product-card { min-height: 430px; display: grid; place-items: center; padding: 28px; background: linear-gradient(150deg, #fff 0%, #edf6ff 100%); }
.phone-shell { width: min(300px, 78vw); border-radius: 38px; padding: 12px; background: #10233f; box-shadow: 0 26px 70px rgba(16,35,63,.20); }
.phone-shell img { border-radius: 28px; }
.status-grid { display: grid; gap: 14px; }
.status-card { padding: 20px; }
.status-card strong { display: block; margin-bottom: 8px; font-size: 18px; }
.dot { width: 10px; height: 10px; display: inline-block; border-radius: 50%; background: var(--primary); margin-right: 8px; box-shadow: 0 0 0 6px rgba(70,139,223,.10); }
.section-head { max-width: 720px; margin-bottom: 26px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.section-head p:not(.eyebrow) { margin-top: 12px; }
.feature-grid { display: grid; gap: 16px; }
.feature-grid article { padding: 22px; }
.feature-grid article p, .bento-card p, .category-card p, .scenario-card p { margin-top: 10px; }
.roadmap { display: grid; gap: 14px; position: relative; }
.road-step { padding: 20px; border: 1px solid var(--line); border-radius: 22px; background: #fff; position: relative; box-shadow: 0 12px 30px rgba(31,95,174,.07); }
.road-step span, .mini-steps span, .principle-list span { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 12px; background: rgba(70,139,223,.12); color: var(--primary-dark); font-weight: 800; margin-bottom: 12px; }
.road-step h3 { font-size: 18px; }
.category-bento, .bento-grid, .scenario-grid { display: grid; gap: 16px; }
.category-card { display: block; padding: 24px; min-height: 150px; background: linear-gradient(160deg, #fff 0%, #f4f9ff 100%); }
.category-card:hover, .scenario-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.42); }
.bento-card { padding: 24px; min-height: 150px; }
.bento-large { background: linear-gradient(160deg, #ffffff 0%, #eef6ff 100%); }
.bento-medium { background: #f9fcff; }
.security-panel { background: linear-gradient(120deg, #f4f9ff 0%, #ffffff 100%); }
.security-layout { display: grid; gap: 22px; align-items: center; }
.security-layout p + p { margin-top: 14px; }
.principle-list { display: grid; gap: 12px; }
.principle-list div { padding: 18px; display: grid; grid-template-columns: 44px 1fr; gap: 12px; align-items: start; }
.principle-list span { margin-bottom: 0; }
.scenario-card { padding: 22px; background: #fff; transition: .18s ease; }
.faq-list { display: grid; gap: 12px; }
.faq-item { padding: 18px 20px; }
.faq-item summary { cursor: pointer; font-weight: 800; color: var(--text); }
.faq-item p { margin-top: 12px; }
.cta-section { padding: 68px 0; background: radial-gradient(circle at center, rgba(70,139,223,.15), transparent 42%), linear-gradient(180deg, #fff 0%, #edf6ff 100%); }
.cta-inner { text-align: center; max-width: 780px; }
.cta-inner p:not(.eyebrow) { margin: 14px auto 24px; max-width: 620px; }
.page-hero { padding: 68px 0 34px; background: linear-gradient(180deg, #f2f8ff 0%, #fff 100%); }
.compact-hero, .doc-hero { text-align: left; }
.page-hero h1 { font-size: clamp(32px, 7vw, 54px); }
.page-hero p:not(.badge) { margin: 18px 0 24px; font-size: 17px; }
.article-section { padding-top: 34px; }
.article-layout { display: grid; gap: 24px; align-items: start; }
.article-content { background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 24px; box-shadow: 0 14px 34px rgba(31,95,174,.06); }
.article-content h2 { font-size: 25px; margin-top: 26px; }
.article-content h2:first-child { margin-top: 0; }
.article-content p, .article-content li { color: var(--muted); }
.article-content p { margin-top: 12px; }
.check-list { padding-left: 22px; margin: 14px 0 0; }
.side-card { padding: 22px; background: linear-gradient(160deg, #fff 0%, #f3f8ff 100%); }
.side-card.warning { background: linear-gradient(160deg, #fff 0%, #fff8f3 100%); }
.side-card ul { margin: 14px 0 0; padding-left: 18px; color: var(--muted); }
.mini-steps { display: grid; gap: 12px; margin-top: 16px; }
.mini-steps div { display: grid; grid-template-columns: 44px 1fr; gap: 12px; align-items: center; padding: 14px; border: 1px solid var(--line); border-radius: 18px; background: var(--blue-50); }
.mini-steps span { margin-bottom: 0; }
.site-footer { border-top: 1px solid var(--line); background: #fff; padding: 34px 0 18px; }
.footer-inner { width: min(100% - 32px, 1160px); margin: 0 auto; display: grid; gap: 22px; }
.footer-inner p { margin-top: 12px; max-width: 560px; }
.footer-links { display: grid; gap: 10px; }
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--primary-dark); }
.copyright { text-align: center; color: var(--muted); font-size: 13px; margin-top: 28px; }
@media (min-width: 720px) {
    .container { width: min(100% - 48px, 1160px); }
    .product-bento { grid-template-columns: 1.25fr .75fr; align-items: stretch; }
    .status-grid { grid-template-columns: repeat(2, 1fr); }
    .four-grid { grid-template-columns: repeat(2, 1fr); }
    .category-bento, .scenario-grid { grid-template-columns: repeat(2, 1fr); }
    .bento-grid { grid-template-columns: repeat(4, 1fr); }
    .bento-large { grid-column: span 2; min-height: 220px; }
    .bento-medium { grid-column: span 2; }
    .security-layout { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 980px) {
    .nav-trigger { display: none; }
    .nav-menu { display: flex; position: static; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .nav-menu a { padding: 10px 12px; font-size: 15px; }
    .centered-hero { padding-top: 104px; }
    .status-grid { align-content: center; }
    .feature-grid.four-grid { grid-template-columns: repeat(4, 1fr); }
    .roadmap { grid-template-columns: repeat(6, 1fr); gap: 12px; }
    .road-step:nth-child(even) { transform: translateY(24px); }
    .category-bento { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(150px, auto); }
    .category-card.large { grid-column: span 2; grid-row: span 2; }
    .article-layout { grid-template-columns: minmax(0, 1fr) 310px; }
    .article-content { padding: 34px; }
    .footer-inner { grid-template-columns: 1fr 320px; align-items: start; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1160px); }
    .section { padding: 46px 0; }
    .download-btn { width: 100%; min-height: 52px; }
    .page-hero .download-btn, .centered-hero .download-btn, .cta-section .download-btn { width: min(100%, 320px); }
    .article-content, .side-card { padding: 20px; }
}