:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(38,98,176);
    --primary-soft: rgb(231,242,255);
    --ink: #102033;
    --muted: #607086;
    --line: #dce8f7;
    --panel: rgba(255,255,255,.88);
    --bg: #f7fbff;
    --card-shadow: 0 18px 50px rgba(33, 93, 160, .10);
    --soft-shadow: 0 10px 28px rgba(30, 89, 150, .08);
    --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-width: 320px;
    overflow-x: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    line-height: 1.75;
    background:
        radial-gradient(circle at 18% 0%, rgba(70,139,223,.15), transparent 34%),
        linear-gradient(180deg, #ffffff 0%, #f4f9ff 44%, #ffffff 100%);
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
}
.section { padding: 64px 0; }
.section-title { max-width: 760px; margin: 0 auto 28px; text-align: center; }
.section-title h2, .security-layout h2, .cta-section h2 { margin: 0 0 12px; font-size: clamp(1.75rem, 4vw, 2.55rem); line-height: 1.18; letter-spacing: -.04em; }
.section-title p, .security-layout p, .cta-section p { margin: 0; color: var(--muted); }

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.82);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220,232,247,.8);
}
.header-inner {
    width: min(100% - 28px, 1160px);
    min-height: 68px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.brand, .footer-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; }
.logo { width: 38px; height: 38px; border-radius: 12px; }
.site-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    background: rgba(255,255,255,.97);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--soft-shadow);
}
.site-nav.is-open { display: flex; }
.site-nav a {
    padding: 10px 12px;
    border-radius: 13px;
    color: #33445c;
    font-size: .96rem;
}
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.nav-toggle {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    gap: 0;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 14px;
}
.nav-toggle span { width: 18px; height: 2px; background: var(--ink); display: block; margin: 2px 0; border-radius: 4px; }

.centered-hero {
    padding: 86px 0 36px;
    text-align: center;
}
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 12px;
    border: 1px solid rgba(70,139,223,.18);
    color: var(--primary-dark);
    background: rgba(231,242,255,.78);
    border-radius: 999px;
    font-size: .85rem;
    font-weight: 700;
}
.centered-hero h1, .page-hero h1 {
    max-width: 930px;
    margin: 18px auto 16px;
    font-size: clamp(2.25rem, 8vw, 5rem);
    line-height: 1.04;
    letter-spacing: -.065em;
}
.centered-hero .lead, .page-hero .lead {
    max-width: 780px;
    margin: 0 auto 28px;
    color: var(--muted);
    font-size: clamp(1rem, 2vw, 1.18rem);
}
.download-btn {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    letter-spacing: .01em;
    box-shadow: 0 12px 26px 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 18px 36px rgba(70,139,223,.30); }
.trust-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 18px;
}
.trust-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #42546a;
    font-size: .9rem;
}

.product-bento {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 18px;
    margin-top: 34px;
    background: linear-gradient(135deg, rgba(70,139,223,.11), rgba(255,255,255,.82));
    border: 1px solid rgba(70,139,223,.15);
    border-radius: 30px;
    box-shadow: var(--card-shadow);
}
.product-device-card {
    position: relative;
    min-height: 320px;
    display: grid;
    place-items: center;
    padding: 24px;
    overflow: hidden;
    background: linear-gradient(180deg, #ffffff, #eef6ff);
    border: 1px solid rgba(220,232,247,.9);
    border-radius: 26px;
}
.product-device-card::before {
    content: "";
    position: absolute;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: rgba(70,139,223,.16);
    filter: blur(12px);
}
.product-device-card img { position: relative; max-height: 420px; filter: drop-shadow(0 28px 42px rgba(38,98,176,.20)); }
.status-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.status-card, .feature-card, .category-card, .bento-card, .principle-card, .scenario-card, .faq-card, .note-card, .doc-card, .step-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--soft-shadow);
}
.status-card { padding: 18px; }
.status-card strong, .feature-card strong, .category-card strong, .scenario-card strong { display: block; margin-bottom: 6px; color: var(--ink); }
.status-card p, .feature-card p, .category-card p, .bento-card p, .principle-card p, .scenario-card p, .faq-card p, .note-card p, .doc-card p, .step-card p { margin: 0; color: var(--muted); }

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

.roadmap {
    position: relative;
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}
.roadmap-step {
    position: relative;
    padding: 18px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--soft-shadow);
}
.roadmap-step .num {
    width: 38px;
    height: 38px;
    display: inline-grid;
    place-items: center;
    margin-bottom: 12px;
    border-radius: 13px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}
.roadmap-step h3 { margin: 0 0 8px; font-size: 1.05rem; }
.roadmap-step 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, .bento-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.category-card, .bento-card, .scenario-card, .faq-card { padding: 22px; }
.category-card small { display: block; color: var(--primary-dark); font-weight: 800; margin-bottom: 8px; }
.bento-card h3, .category-card h3, .scenario-card h3 { margin: 0 0 10px; font-size: 1.22rem; letter-spacing: -.02em; }
.bento-card.large { min-height: 230px; }
.bento-card.tall { min-height: 260px; }

.security-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 26px;
    border: 1px solid rgba(70,139,223,.14);
    border-radius: 30px;
    background: linear-gradient(135deg, #ffffff, #eef7ff);
    box-shadow: var(--card-shadow);
}
.principle-stack { display: grid; gap: 12px; }
.principle-card { padding: 18px; }
.principle-card strong { display: block; margin-bottom: 4px; }

.faq-list { display: grid; gap: 12px; }
.faq-item {
    padding: 20px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--soft-shadow);
}
.faq-item h2, .faq-item h3 { margin: 0 0 8px; font-size: 1.06rem; }
.faq-item p { margin: 0; color: var(--muted); }

.cta-section {
    width: min(100% - 32px, 1080px);
    margin: 40px auto 76px;
    padding: 42px 22px;
    text-align: center;
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 30px;
    background: linear-gradient(135deg, rgba(231,242,255,.96), rgba(255,255,255,.96));
    box-shadow: var(--card-shadow);
}
.cta-section .download-btn { margin-top: 22px; }

.page-hero {
    padding: 58px 0 28px;
    text-align: center;
}
.page-hero h1 { font-size: clamp(2rem, 6vw, 4rem); }
.article-wrap {
    width: min(100% - 32px, 1040px);
    margin: 0 auto 72px;
}
.doc-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
    align-items: start;
}
.doc-main, .doc-aside {
    display: grid;
    gap: 18px;
}
.doc-card { padding: 24px; }
.doc-card h2, .note-card h2, .doc-card h3, .note-card h3 { margin: 0 0 12px; line-height: 1.25; letter-spacing: -.02em; }
.doc-card p + p { margin-top: 12px; }
.doc-card ul, .doc-card ol, .note-card ul, .note-card ol { margin: 10px 0 0; padding-left: 1.2em; color: var(--muted); }
.doc-card li, .note-card li { margin: 6px 0; }
.note-card { padding: 20px; background: linear-gradient(180deg, #fff, #f4f9ff); }
.step-list { display: grid; gap: 12px; margin-top: 14px; }
.step-card { padding: 18px; }
.step-card .num { color: var(--primary-dark); font-weight: 900; }
.cta-inline { text-align: center; margin-top: 18px; }
.split-two { display: grid; grid-template-columns: 1fr; gap: 16px; }
.checklist { display: grid; gap: 10px; padding: 0; margin: 14px 0 0; list-style: none; }
.checklist li { padding: 12px 14px; border-radius: 14px; background: var(--primary-soft); color: #344960; }

.site-footer {
    background: #0f253f;
    color: rgba(255,255,255,.82);
    padding: 46px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 28px; }
.footer-logo { width: 34px; height: 34px; border-radius: 11px; }
.site-footer h2 { margin: 0 0 10px; color: #fff; font-size: 1rem; }
.site-footer a { display: block; color: rgba(255,255,255,.76); margin: 6px 0; }
.site-footer p { color: rgba(255,255,255,.66); margin-bottom: 0; }
.footer-bottom { margin-top: 36px; padding: 18px 16px; text-align: center; border-top: 1px solid rgba(255,255,255,.1); font-size: .9rem; color: rgba(255,255,255,.58); }

@media (min-width: 680px) {
    .security-grid, .scenario-grid, .faq-summary-grid, .process-grid { grid-template-columns: repeat(2, 1fr); }
    .category-bento { grid-template-columns: repeat(2, 1fr); }
    .split-two { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 920px) {
    .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;
    }
    .site-nav a { padding: 8px 10px; }
    .centered-hero { padding-top: 118px; }
    .product-bento { grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr); gap: 18px; padding: 24px; }
    .status-grid { grid-template-columns: 1fr; align-content: center; }
    .security-grid { grid-template-columns: repeat(4, 1fr); }
    .roadmap { grid-template-columns: repeat(6, 1fr); align-items: stretch; }
    .roadmap-step:nth-child(even) { transform: translateY(24px); }
    .category-bento { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(150px, auto); }
    .category-card.big { grid-column: span 2; }
    .bento-grid { grid-template-columns: repeat(6, 1fr); grid-auto-rows: minmax(150px, auto); }
    .bento-card.large { grid-column: span 3; grid-row: span 2; }
    .bento-card.medium { grid-column: span 2; }
    .bento-card.small { grid-column: span 1; }
    .security-layout { grid-template-columns: minmax(0, .9fr) minmax(360px, .7fr); padding: 42px; }
    .scenario-grid { grid-template-columns: repeat(5, 1fr); }
    .faq-summary-grid { grid-template-columns: repeat(4, 1fr); }
    .doc-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .footer-grid { grid-template-columns: 1.6fr 1fr 1fr; }
}

@media (min-width: 1120px) {
    .site-nav a { padding: 9px 14px; }
    .product-device-card { min-height: 520px; }
}