:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #eaf3ff;
    --ink: #112033;
    --muted: #66758b;
    --line: #dbe8f7;
    --bg: #f6faff;
    --card: rgba(255,255,255,.88);
    --shadow: 0 18px 45px rgba(32, 93, 158, .10);
    --radius: 22px;
    --radius-lg: 28px;
    --container: 1160px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.7;
    background:
        radial-gradient(circle at 15% 5%, rgba(70,139,223,.16), transparent 34%),
        linear-gradient(180deg, #f8fbff 0%, #ffffff 42%, #f4f9ff 100%);
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(100% - 32px, var(--container)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(219,232,247,.78);
}
.header-inner { 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: -.02em; color: #0f2541; }
.logo { width: 38px; height: 38px; border-radius: 12px; }
.nav-toggle { display: none; }
.nav-toggle-label { width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 14px; display: inline-flex; flex-direction: column; align-items: center; justify-content: center; gap: 5px; background: #fff; }
.nav-toggle-label span { width: 18px; height: 2px; border-radius: 2px; background: #31506e; }
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow);
}
.site-nav a { padding: 10px 12px; color: #52647a; border-radius: 12px; font-size: 15px; }
.site-nav a.active, .site-nav a:hover { color: var(--primary-dark); background: var(--primary-soft); }
.nav-toggle:checked ~ .site-nav { display: flex; }
.section { padding: 58px 0; }
.section-heading { max-width: 760px; margin-bottom: 26px; }
.section-heading.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,.10);
    color: var(--primary-dark);
    border: 1px solid rgba(70,139,223,.18);
    font-size: 13px;
    font-weight: 700;
}
h1, h2, h3 { line-height: 1.22; margin: 0; letter-spacing: -.035em; }
h1 { font-size: clamp(36px, 9vw, 66px); }
h2 { font-size: clamp(28px, 6vw, 42px); }
h3 { font-size: 20px; }
p { margin: 0; color: var(--muted); }
.lead { font-size: 18px; color: #52647a; }
.hero { padding: 62px 0 42px; }
.hero-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
    align-items: center;
}
.hero-copy { display: grid; gap: 20px; }
.hero-copy h1 span { color: var(--primary); }
.hero-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span, .tag-row span, .soft-tag {
    display: inline-flex;
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    color: #31506e;
    border: 1px solid var(--line);
    font-size: 13px;
    box-shadow: 0 8px 20px rgba(32,93,158,.06);
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(70,139,223,.28);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 34px rgba(70,139,223,.34); }
.hero-visual {
    position: relative;
    padding: 18px;
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 32px;
    background: linear-gradient(145deg, rgba(255,255,255,.94), rgba(232,243,255,.72));
    box-shadow: var(--shadow);
    min-height: 520px;
    overflow: hidden;
}
.hero-visual::before {
    content: "";
    position: absolute;
    inset: auto -18% -22% 12%;
    height: 250px;
    background: radial-gradient(circle, rgba(70,139,223,.24), transparent 70%);
}
.phone-wrap { position: relative; z-index: 1; width: min(285px, 84%); margin: 24px auto 12px; }
.phone-wrap img { width: 100%; filter: drop-shadow(0 28px 46px rgba(42,82,128,.20)); }
.status-card {
    position: relative;
    z-index: 2;
    margin: 10px 0;
    padding: 14px 16px;
    border-radius: 18px;
    background: rgba(255,255,255,.88);
    border: 1px solid rgba(219,232,247,.92);
    box-shadow: 0 12px 28px rgba(32,93,158,.09);
}
.status-card strong { display: block; color: #18365a; font-size: 14px; }
.status-card span { color: var(--muted); font-size: 13px; }
.status-card.floating { max-width: 260px; }
.status-card.right { margin-left: auto; }
.stats-strip {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}
.stat-item, .feature-card, .category-card, .scenario-card, .faq-item, .doc-card, .security-card, .step-card, .recommend-card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--card);
    box-shadow: 0 12px 30px rgba(32,93,158,.06);
}
.stat-item { padding: 20px; }
.stat-item small { color: var(--primary-dark); font-weight: 800; }
.stat-item h3 { margin: 8px 0 8px; }
.path-grid, .category-grid, .feature-grid, .scenario-grid, .recommend-grid, .faq-grid, .doc-grid, .guide-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.path-card, .category-card, .feature-card, .scenario-card, .recommend-card { padding: 22px; }
.path-card {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    background: linear-gradient(160deg, #ffffff, #eef7ff);
    border: 1px solid var(--line);
}
.path-number {
    display: inline-flex;
    width: 34px;
    height: 34px;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    margin-bottom: 14px;
}
.card-link { display: inline-flex; margin-top: 14px; color: var(--primary-dark); font-weight: 800; }
.category-card { min-height: 172px; display: flex; flex-direction: column; justify-content: space-between; }
.category-card.featured { background: linear-gradient(140deg, rgba(70,139,223,.12), #fff); }
.feature-grid { grid-auto-flow: dense; }
.feature-card { min-height: 190px; }
.feature-card.large { background: linear-gradient(145deg, #fff, #eef7ff); }
.feature-card h3, .category-card h3, .scenario-card h3, .doc-card h3, .security-card h3 { margin-bottom: 10px; }
.icon-dot { width: 36px; height: 36px; border-radius: 14px; background: var(--primary-soft); border: 1px solid rgba(70,139,223,.22); margin-bottom: 16px; position: relative; }
.icon-dot::after { content: ""; position: absolute; width: 12px; height: 12px; border-radius: 50%; background: var(--primary); left: 12px; top: 12px; }
.security-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: center;
    padding: 26px;
    border-radius: 30px;
    background: linear-gradient(145deg, #ffffff, #eef7ff);
    border: 1px solid var(--line);
}
.security-panel { display: grid; gap: 12px; }
.security-card { padding: 18px; background: #fff; }
.check-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 28px; color: #52647a; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--primary); font-weight: 900; }
.steps { counter-reset: step; display: grid; grid-template-columns: 1fr; gap: 14px; }
.step-card { position: relative; padding: 20px; background: #fff; }
.step-card::before { counter-increment: step; content: counter(step, decimal-leading-zero); display: inline-flex; margin-bottom: 12px; color: var(--primary); font-weight: 900; }
.faq-item { padding: 20px; }
.faq-item summary { cursor: pointer; font-weight: 800; color: #18365a; }
.faq-item p { margin-top: 10px; }
.cta-section {
    padding: 44px 22px;
    border-radius: 34px;
    text-align: center;
    background: linear-gradient(135deg, rgba(70,139,223,.12), #fff 58%, rgba(70,139,223,.10));
    border: 1px solid rgba(70,139,223,.18);
    box-shadow: var(--shadow);
}
.cta-section p { max-width: 700px; margin: 12px auto 0; }
.page-hero { padding: 54px 0 28px; }
.page-hero-inner {
    display: grid;
    gap: 16px;
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: 32px;
    background: linear-gradient(145deg, rgba(255,255,255,.94), rgba(235,246,255,.78));
    box-shadow: var(--shadow);
}
.page-layout { display: grid; grid-template-columns: 1fr; gap: 18px; align-items: start; }
.article { display: grid; gap: 18px; max-width: 780px; }
.article p { color: #52647a; }
.doc-card { padding: 22px; background: #fff; }
.side-panel { display: grid; gap: 14px; }
.note-card {
    padding: 20px;
    border-radius: var(--radius);
    background: #f3f8ff;
    border: 1px solid var(--line);
}
.warning-card {
    padding: 20px;
    border-radius: var(--radius);
    background: #fff;
    border: 1px solid #dbe8f7;
    box-shadow: 0 10px 26px rgba(32,93,158,.06);
}
.timeline { display: grid; gap: 12px; margin-top: 12px; }
.timeline-item { padding: 16px; border-left: 3px solid var(--primary); background: #fff; border-radius: 0 16px 16px 0; border-top: 1px solid var(--line); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.install-steps { display: grid; gap: 12px; }
.install-steps div { padding: 16px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.site-footer { margin-top: 60px; padding: 44px 0 24px; background: #0f2541; color: #dce9f7; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 900; color: #fff; margin-bottom: 12px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h3 { color: #fff; font-size: 16px; margin-bottom: 10px; }
.site-footer a { display: block; color: #bdd0e5; margin: 7px 0; font-size: 14px; }
.site-footer p { color: #bdd0e5; }
.footer-bottom { display: flex; flex-direction: column; gap: 8px; border-top: 1px solid rgba(255,255,255,.12); margin-top: 28px; padding-top: 18px; color: #a9bed4; font-size: 13px; }
@media (min-width: 720px) {
    .container { width: min(100% - 48px, var(--container)); }
    .stats-strip { grid-template-columns: repeat(4, 1fr); }
    .path-grid, .category-grid, .feature-grid, .scenario-grid, .recommend-grid, .faq-grid, .doc-grid, .guide-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}
@media (min-width: 980px) {
    .nav-toggle-label { display: none; }
    .site-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; border: 0; box-shadow: none; background: transparent; gap: 4px; }
    .site-nav a { font-size: 14px; }
    .hero { padding: 84px 0 54px; }
    .hero-layout { grid-template-columns: .95fr 1.05fr; gap: 46px; }
    .hero-visual { min-height: 560px; padding: 24px; }
    .status-card.floating { position: absolute; }
    .status-card.floating.one { left: 26px; top: 42px; }
    .status-card.floating.two { right: 26px; top: 128px; }
    .status-card.floating.three { left: 42px; bottom: 80px; }
    .status-card.floating.four { right: 36px; bottom: 32px; }
    .phone-wrap { margin-top: 62px; }
    .path-grid { grid-template-columns: repeat(6, 1fr); }
    .path-card { grid-column: span 2; }
    .category-grid { grid-template-columns: repeat(3, 1fr); }
    .category-card.featured { grid-column: span 2; }
    .feature-grid { grid-template-columns: repeat(3, 1fr); }
    .feature-card.large { grid-column: span 2; }
    .security-layout { grid-template-columns: .9fr 1.1fr; padding: 38px; }
    .steps { grid-template-columns: repeat(4, 1fr); }
    .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 330px; gap: 32px; }
    .doc-grid { grid-template-columns: repeat(3, 1fr); }
    .guide-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
    .download-btn { width: 100%; }
    .hero-tags span, .tag-row span { flex: 1 1 100%; justify-content: center; }
    h1 { font-size: 34px; }
    .section { padding: 44px 0; }
    .hero-visual { min-height: auto; }
}