:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(36,91,164);
    --primary-soft: rgba(70,139,223,0.12);
    --ink: #142033;
    --muted: #607089;
    --line: #dce8f7;
    --bg: #f7fbff;
    --card: #ffffff;
    --soft: #edf6ff;
    --radius: 22px;
    --shadow: 0 18px 50px rgba(42, 101, 170, 0.10);
}
* { 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%, var(--bg) 48%, #ffffff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }
.readable { max-width: 820px; }
.center-text { text-align: center; }
.section { padding: 64px 0; }
.soft-section { background: linear-gradient(180deg, rgba(237,246,255,0.68), rgba(255,255,255,0.2)); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(220,232,247,0.85);
}
.header-inner {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.02em; }
.logo-img { width: 38px; height: 38px; border-radius: 12px; }
.nav-toggle { display: none; }
.nav-toggle-label { display: flex; flex-direction: column; gap: 5px; padding: 10px; cursor: pointer; }
.nav-toggle-label span { width: 24px; height: 2px; background: var(--ink); border-radius: 999px; }
.main-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 14px;
    background: rgba(255,255,255,0.96);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .main-nav { display: flex; }
.main-nav a { padding: 10px 12px; border-radius: 12px; color: var(--muted); font-size: 15px; }
.main-nav a:hover, .main-nav a.active { color: var(--primary-dark); background: var(--primary-soft); }
.centered-hero {
    position: relative;
    padding: 82px 0 36px;
    text-align: center;
    overflow: hidden;
    background:
        radial-gradient(circle at 50% 0%, rgba(70,139,223,0.20), transparent 38%),
        linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);
}
.hero-glow {
    position: absolute;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    background: rgba(70,139,223,0.12);
    filter: blur(20px);
    left: 50%;
    top: 15%;
    transform: translateX(-50%);
}
.hero-content { position: relative; max-width: 960px; }
.eyebrow, .doc-badge, .card-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    background: var(--primary-soft);
    border: 1px solid rgba(70,139,223,0.18);
    border-radius: 999px;
    padding: 7px 12px;
    font-size: 13px;
    font-weight: 700;
}
h1, h2, h3 { margin: 0 0 14px; line-height: 1.18; letter-spacing: -0.04em; }
h1 { font-size: clamp(38px, 9vw, 72px); max-width: 920px; margin-left: auto; margin-right: auto; }
h2 { font-size: clamp(28px, 5vw, 44px); }
h3 { font-size: 20px; }
p { margin: 0 0 18px; color: var(--muted); }
.hero-text { max-width: 780px; margin: 20px auto 28px; font-size: 17px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(70,139,223,0.28);
    border: 1px solid rgba(255,255,255,0.4);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 34px rgba(70,139,223,0.34); }
.trust-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 18px; }
.trust-tags span { padding: 8px 12px; border: 1px solid var(--line); color: var(--muted); background: rgba(255,255,255,0.76); border-radius: 999px; font-size: 14px; }
.product-showcase { padding-top: 34px; }
.product-bento { display: grid; grid-template-columns: 1fr; gap: 16px; }
.product-card, .feature-card, .category-card, .bento-card, .scenario-card, .principle-panel, .doc-main, .doc-aside > div, .faq-item, .cta-card {
    background: rgba(255,255,255,0.88);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.product-card { padding: 22px; overflow: hidden; }
.visual-orbit { min-height: 320px; display: grid; place-items: center; border-radius: 26px; background: linear-gradient(145deg, rgba(70,139,223,0.14), rgba(255,255,255,0.9)); border: 1px solid rgba(70,139,223,0.16); }
.app-preview { width: min(260px, 78%); filter: drop-shadow(0 18px 35px rgba(42,101,170,0.20)); }
.product-copy { padding-top: 22px; }
.status-card { padding: 18px; border-radius: 20px; border: 1px solid var(--line); background: rgba(255,255,255,0.92); box-shadow: 0 12px 34px rgba(42,101,170,0.08); }
.status-card strong { display: block; margin-bottom: 5px; }
.status-card span { color: var(--muted); font-size: 14px; }
.section-heading { margin-bottom: 24px; }
.section-heading p { max-width: 680px; }
.four-grid, .feature-grid, .scenario-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.feature-card { padding: 22px; }
.roadmap { display: grid; grid-template-columns: 1fr; gap: 16px; position: relative; }
.roadmap-step { position: relative; padding: 22px; background: #fff; border: 1px solid var(--line); border-radius: 22px; box-shadow: 0 12px 30px rgba(42,101,170,0.08); }
.roadmap-step span { display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 14px; background: var(--primary); color: #fff; font-weight: 800; margin-bottom: 14px; }
.roadmap-step a, .scenario-card a, .related-card a { color: var(--primary-dark); font-weight: 800; }
.category-bento { display: grid; grid-template-columns: 1fr; gap: 16px; }
.category-card { display: block; padding: 22px; min-height: 150px; transition: transform .2s ease, border-color .2s ease; }
.category-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,0.45); }
.bento-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.bento-card { padding: 24px; min-height: 150px; }
.bento-large { background: linear-gradient(145deg, #ffffff, #eef7ff); }
.bento-small { min-height: 118px; }
.security-layout { display: grid; grid-template-columns: 1fr; gap: 18px; align-items: center; }
.security-copy { padding: 4px; }
.principle-panel { padding: 24px; background: linear-gradient(145deg, #ffffff, #f1f8ff); }
.principle-panel ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.principle-panel li { position: relative; padding-left: 26px; color: var(--muted); }
.principle-panel li:before { content: ''; position: absolute; left: 0; top: 10px; width: 10px; height: 10px; border-radius: 50%; background: var(--primary); }
.scenario-card { padding: 22px; }
.faq-preview { display: grid; grid-template-columns: 1fr; gap: 20px; }
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 18px 20px; }
.faq-item summary { cursor: pointer; font-weight: 800; color: var(--ink); }
.faq-item p { margin-top: 12px; margin-bottom: 0; }
.faq-cta { text-align: center; padding-top: 18px; }
.cta-section { padding-top: 46px; }
.cta-card { text-align: center; padding: 34px 22px; background: linear-gradient(135deg, #ffffff, #edf6ff); }
.cta-card p { max-width: 640px; margin-left: auto; margin-right: auto; }
.page-hero { background: linear-gradient(180deg, #ffffff, #f4f9ff); }
.slim-hero { padding: 72px 0 44px; }
.doc-layout { display: grid; grid-template-columns: 1fr; gap: 20px; align-items: start; }
.doc-main { padding: 24px; }
.doc-main h2 { font-size: 25px; margin-top: 26px; }
.doc-main h2:first-child { margin-top: 0; }
.doc-aside { display: grid; gap: 16px; }
.note-card, .warning-card, .related-card { padding: 20px; }
.warning-card { background: #fff9f2 !important; border-color: #ffe0ba !important; }
.related-card { display: grid; gap: 10px; }
.process-list { display: grid; gap: 12px; margin: 18px 0; }
.process-list div { display: grid; grid-template-columns: 42px 1fr; gap: 12px; padding: 16px; background: var(--bg); border: 1px solid var(--line); border-radius: 18px; }
.process-list span, .check-panel li span { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 12px; background: var(--primary); color: #fff; font-weight: 800; }
.process-list p { margin: 0; }
.check-panel { margin: 28px 0; padding: 20px; border-radius: 22px; background: var(--bg); border: 1px solid var(--line); }
.check-panel ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.check-panel li { display: grid; grid-template-columns: 38px 1fr; align-items: center; gap: 10px; color: var(--muted); }
.site-footer { margin-top: 30px; padding: 42px 0 24px; background: #f2f8ff; border-top: 1px solid var(--line); }
.footer-inner { width: min(1120px, calc(100% - 36px)); margin: 0 auto; display: grid; grid-template-columns: 1fr; gap: 24px; }
.footer-brand { display: grid; grid-template-columns: 48px 1fr; gap: 14px; align-items: start; }
.footer-logo { width: 48px; height: 48px; border-radius: 14px; }
.footer-links { display: grid; gap: 10px; }
.footer-links a { color: var(--muted); }
.footer-bottom { width: min(1120px, calc(100% - 36px)); margin: 24px auto 0; color: var(--muted); font-size: 13px; }
@media (min-width: 720px) {
    .container { width: min(1120px, calc(100% - 56px)); }
    .section { padding: 82px 0; }
    .four-grid, .feature-grid, .scenario-grid { grid-template-columns: repeat(2, 1fr); }
    .category-bento { grid-template-columns: repeat(2, 1fr); }
    .product-bento { grid-template-columns: repeat(2, 1fr); }
    .large-card { grid-column: span 2; }
    .faq-preview { grid-template-columns: .9fr 1.1fr; }
    .footer-inner { grid-template-columns: 1.4fr 1fr; }
}
@media (min-width: 980px) {
    .nav-toggle-label { display: none; }
    .main-nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 3px; padding: 0; background: transparent; border: 0; box-shadow: none; }
    .main-nav a { padding: 9px 11px; }
    .centered-hero { padding: 112px 0 44px; }
    .product-bento { grid-template-columns: 1.4fr .8fr .8fr; grid-auto-rows: minmax(130px, auto); align-items: stretch; }
    .large-card { grid-column: span 2; grid-row: span 2; display: grid; grid-template-columns: 1fr .8fr; gap: 26px; align-items: center; padding: 30px; }
    .product-copy { padding-top: 0; }
    .visual-orbit { min-height: 460px; }
    .app-preview { width: 300px; }
    .lift-one { transform: translateY(20px); }
    .lift-two { transform: translateY(-4px); }
    .lift-three { transform: translateY(12px); }
    .lift-four { transform: translateY(-12px); }
    .four-grid { grid-template-columns: repeat(4, 1fr); }
    .roadmap { grid-template-columns: repeat(6, 1fr); gap: 12px; }
    .roadmap:before { content: ''; position: absolute; left: 8%; right: 8%; top: 42px; height: 2px; background: var(--line); }
    .roadmap-step { padding: 18px; }
    .roadmap-step:nth-child(even) { margin-top: 42px; }
    .category-bento { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(150px, auto); }
    .category-card.wide { grid-column: span 2; }
    .category-card.tall { grid-row: span 2; }
    .bento-grid { grid-template-columns: repeat(6, 1fr); grid-auto-rows: minmax(150px, auto); }
    .bento-large { grid-column: span 3; grid-row: span 2; }
    .bento-mid { grid-column: span 3; }
    .bento-small { grid-column: span 2; }
    .security-layout { grid-template-columns: 1.1fr .9fr; gap: 34px; }
    .scenario-grid { grid-template-columns: repeat(5, 1fr); }
    .doc-layout { grid-template-columns: minmax(0, 760px) 300px; gap: 28px; }
    .doc-aside { position: sticky; top: 92px; }
    .doc-main { padding: 34px; }
}
@media (max-width: 520px) {
    .download-btn { width: 100%; max-width: 320px; }
    .hero-text { font-size: 15px; }
    .status-card, .feature-card, .category-card, .bento-card, .scenario-card, .doc-main { padding: 20px; }
    .centered-hero { padding-top: 68px; }
}