:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fbc;
    --primary-soft: #eaf4ff;
    --ink: #11243d;
    --muted: #5f7188;
    --line: #dbe8f8;
    --card: #ffffff;
    --bg: #f7fbff;
    --shadow: 0 18px 45px rgba(34, 98, 171, 0.12);
    --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #f2f8ff 0%, #ffffff 38%, #f7fbff 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% - 32px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(219,232,248,0.85);
}
.nav-shell { min-height: 72px; 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: .2px; color: #12345b; }
.brand-logo { width: 38px; height: 38px; object-fit: contain; border-radius: 12px; }
.brand-text { font-size: 18px; }
.nav-toggle { display: none; }
.nav-button { width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 14px; display: grid; place-content: center; gap: 5px; background: #fff; }
.nav-button span { width: 18px; height: 2px; background: var(--ink); border-radius: 99px; display: block; }
.site-nav {
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav { display: flex; }
.site-nav a { padding: 10px 12px; border-radius: 12px; color: #445872; font-weight: 600; }
.site-nav a.active, .site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.section { padding: 52px 0; }
.section-title { max-width: 760px; margin-bottom: 24px; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,0.1);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}
h1, h2, h3 { line-height: 1.22; margin: 0 0 14px; color: #10233c; }
h1 { font-size: clamp(34px, 9vw, 58px); letter-spacing: -1.8px; }
h2 { font-size: clamp(26px, 6vw, 38px); letter-spacing: -1px; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.hero { padding: 54px 0 36px; position: relative; }
.hero::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 360px;
    background: radial-gradient(circle at 18% 18%, rgba(70,139,223,.22), transparent 32%), radial-gradient(circle at 85% 8%, rgba(118,183,255,.22), transparent 28%);
    pointer-events: none;
}
.hero-layout { position: relative; display: grid; gap: 32px; align-items: center; }
.hero-copy { max-width: 670px; }
.hero-copy p { font-size: 17px; }
.hero-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 24px; }
.tag { padding: 8px 12px; border: 1px solid rgba(70,139,223,.18); color: #29435f; border-radius: 999px; background: rgba(255,255,255,.72); font-size: 13px; font-weight: 700; }
.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;
    border: 0;
    box-shadow: 0 12px 28px rgba(70,139,223,.28);
    cursor: pointer;
    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 32px rgba(70,139,223,.32); }
.hero-device { position: relative; min-height: 380px; display: grid; place-items: center; }
.device-card {
    width: min(360px, 88vw);
    border-radius: 34px;
    padding: 22px;
    background: linear-gradient(145deg, rgba(255,255,255,.96), rgba(236,246,255,.92));
    border: 1px solid rgba(255,255,255,.92);
    box-shadow: var(--shadow);
}
.device-card img { margin: 0 auto; border-radius: 26px; }
.float-card {
    position: absolute;
    background: rgba(255,255,255,.92);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 14px 36px rgba(28,87,151,.12);
    padding: 12px 14px;
    font-size: 13px;
    font-weight: 800;
    color: #17365f;
}
.float-card.status { top: 18px; left: 0; }
.float-card.key { right: 0; top: 80px; }
.float-card.check { bottom: 86px; left: 8px; }
.float-card.asset { right: 6px; bottom: 28px; }
.stats-grid, .category-grid, .feature-grid, .scenario-grid, .info-grid { display: grid; gap: 16px; }
.stat, .category-card, .feature-card, .scenario-card, .info-card, .faq-item, .page-card {
    background: var(--card);
    border: 1px solid rgba(219,232,248,.95);
    border-radius: var(--radius);
    box-shadow: 0 12px 35px rgba(34,98,171,.08);
}
.stat { padding: 20px; }
.stat strong { display: block; color: var(--primary-dark); font-size: 18px; margin-bottom: 6px; }
.category-card, .feature-card, .scenario-card, .info-card, .page-card { padding: 22px; }
.category-card { transition: transform .2s ease, border-color .2s ease; }
.category-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.45); }
.category-card .arrow { color: var(--primary-dark); font-weight: 800; margin-top: 12px; display: inline-block; }
.split-layout, .security-layout, .page-layout { display: grid; gap: 24px; align-items: center; }
.security-panel {
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, #f4f9ff, #ffffff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.security-row { display: flex; align-items: flex-start; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.security-row:last-child { border-bottom: 0; }
.security-dot { width: 12px; height: 12px; margin-top: 8px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 6px rgba(70,139,223,.12); flex: none; }
.steps { display: grid; gap: 14px; counter-reset: step; }
.step {
    position: relative;
    padding: 22px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 10px 28px rgba(34,98,171,.07);
}
.step::before {
    counter-increment: step;
    content: counter(step);
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
    margin-bottom: 12px;
}
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 20px; }
.faq-item h3 { font-size: 18px; }
.cta-section {
    padding: 42px 22px;
    border-radius: 30px;
    background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.86));
    border: 1px solid var(--line);
    text-align: center;
    box-shadow: var(--shadow);
}
.cta-section p { max-width: 680px; margin-left: auto; margin-right: auto; }
.page-hero { padding: 54px 0 28px; }
.page-hero .page-intro { max-width: 820px; font-size: 17px; }
.notice-list { margin: 14px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.notice-list li { padding: 12px 14px; border-radius: 14px; background: var(--primary-soft); color: #27425f; }
.content-block { margin: 22px 0; }
.kv-card { display: grid; grid-template-columns: 1fr; gap: 12px; }
.kv-card div { padding: 16px; border-radius: 18px; background: #f5faff; border: 1px solid var(--line); }
.site-footer { margin-top: 54px; padding: 44px 0 22px; background: #10233c; color: #dceaff; }
.site-footer p, .site-footer a { color: #b8cbe2; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { font-size: 20px; font-weight: 900; color: #fff; margin-bottom: 10px; }
.site-footer h3 { color: #fff; font-size: 16px; }
.site-footer a { display: block; margin: 8px 0; }
.footer-bottom { margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); color: #9fb5d0; font-size: 13px; }
@media (min-width: 640px) {
    .category-grid, .stats-grid, .info-grid, .scenario-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .kv-card { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (min-width: 900px) {
    .nav-button { 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: 9px 12px; }
    .hero { padding: 82px 0 48px; }
    .hero-layout, .split-layout, .security-layout, .page-layout { grid-template-columns: 1.06fr .94fr; gap: 48px; }
    .feature-grid, .category-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
    .stats-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
    .steps { grid-template-columns: repeat(4, minmax(0,1fr)); }
    .scenario-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
    .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1fr; }
    .section { padding: 70px 0; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1120px); }
    .float-card { position: static; margin-top: 10px; width: 100%; }
    .hero-device { display: block; min-height: auto; }
    .device-card { width: 100%; }
    .download-btn { width: 100%; }
}