:root {
    --primary: rgb(70,139,223);
    --primary-dark: #2467b9;
    --primary-soft: #edf6ff;
    --text: #12213a;
    --muted: #5f6f86;
    --line: #dce8f5;
    --card: rgba(255,255,255,.86);
    --shadow: 0 18px 45px rgba(30, 81, 137, .10);
    --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(--text);
    background: linear-gradient(180deg, #f7fbff 0%, #eef7ff 36%, #ffffff 70%);
    line-height: 1.75;
    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: 30;
    background: rgba(255, 255, 255, .88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220, 232, 245, .9);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: 18px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; }
.logo img { width: 38px; height: 38px; border-radius: 12px; box-shadow: 0 8px 18px rgba(70,139,223,.18); }
.nav-toggle { border: 0; background: var(--primary-soft); color: var(--primary-dark); border-radius: 14px; width: 42px; height: 42px; font-size: 22px; cursor: pointer; }
.site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 72px; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); }
.site-nav.nav-open { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.site-nav a { padding: 10px 12px; color: #31435f; border-radius: 12px; font-size: 14px; }
.site-nav a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.section { padding: 44px 0; }
.section-tight { padding: 28px 0; }
.section-title { max-width: 720px; margin: 0 0 22px; }
.section-title.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow, .badge { display: inline-flex; align-items: center; gap: 6px; color: var(--primary-dark); background: rgba(70,139,223,.10); border: 1px solid rgba(70,139,223,.18); border-radius: 999px; padding: 6px 12px; font-size: 13px; font-weight: 700; }
h1, h2, h3 { line-height: 1.25; margin: 0; color: #10213c; }
h1 { font-size: clamp(32px, 9vw, 58px); letter-spacing: -.04em; margin-top: 14px; }
h2 { font-size: clamp(26px, 5vw, 38px); letter-spacing: -.025em; }
h3 { font-size: 20px; }
p { margin: 10px 0 0; color: var(--muted); }
.hero { padding: 42px 0 34px; background: radial-gradient(circle at 15% 10%, rgba(70,139,223,.20), transparent 28%), radial-gradient(circle at 88% 25%, rgba(110,181,255,.24), transparent 26%); }
.hero-layout { display: grid; grid-template-columns: 1fr; gap: 28px; align-items: center; }
.hero-copy p { font-size: 17px; max-width: 640px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 24px; }
.hero-visual { position: relative; min-height: 420px; padding: 18px; border-radius: 30px; background: linear-gradient(135deg, rgba(255,255,255,.86), rgba(236,247,255,.72)); border: 1px solid rgba(255,255,255,.8); box-shadow: var(--shadow); overflow: hidden; }
.phone-card { position: relative; width: min(280px, 74vw); margin: 24px auto 0; padding: 16px; border-radius: 28px; background: #fff; box-shadow: 0 28px 60px rgba(33, 85, 148, .18); }
.phone-card img { border-radius: 24px; }
.status-card { position: absolute; left: 18px; right: 18px; top: 18px; display: grid; grid-template-columns: 1fr auto; gap: 8px; padding: 14px; border-radius: 18px; background: rgba(255,255,255,.92); box-shadow: 0 12px 28px rgba(31, 76, 132, .11); border: 1px solid rgba(220,232,245,.8); }
.status-card strong { font-size: 14px; }
.status-card span { color: var(--muted); font-size: 12px; }
.float-labels { position: absolute; left: 16px; right: 16px; bottom: 18px; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.float-labels span { background: rgba(255,255,255,.92); border: 1px solid var(--line); color: #27415e; border-radius: 999px; padding: 7px 10px; font-size: 12px; box-shadow: 0 8px 18px rgba(25, 70, 128, .08); }
.download-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 24px; border-radius: 999px; background: var(--primary); color: #fff; font-weight: 800; box-shadow: 0 14px 24px 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 34px rgba(70,139,223,.32); }
.trust-bar { display: grid; gap: 12px; }
.trust-item { padding: 18px; border-radius: 20px; background: #fff; border: 1px solid var(--line); box-shadow: 0 10px 30px rgba(28, 82, 145, .07); }
.trust-item strong { display: block; font-size: 17px; }
.trust-item span { color: var(--muted); font-size: 14px; }
.card, .category-card, .scenario-card, .faq-item, .panel { background: var(--card); border: 1px solid rgba(220,232,245,.95); border-radius: var(--radius); box-shadow: var(--shadow); }
.card { padding: 22px; }
.card h3 { margin-bottom: 8px; }
.category-grid, .feature-grid, .scenario-grid, .recommend-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.category-card { display: block; padding: 20px; transition: transform .2s ease, border-color .2s ease; }
.category-card:hover { transform: translateY(-3px); border-color: rgba(70,139,223,.42); }
.category-card small { display: inline-block; color: var(--primary-dark); font-weight: 800; margin-bottom: 8px; }
.category-card p { font-size: 14px; }
.path-steps, .steps { counter-reset: step; display: grid; gap: 14px; }
.step { position: relative; padding: 22px; border-radius: 22px; background: #fff; border: 1px solid var(--line); box-shadow: 0 12px 32px rgba(28,82,145,.07); }
.step:before { counter-increment: step; content: counter(step); display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 800; margin-bottom: 12px; }
.step a { color: var(--primary-dark); font-weight: 800; display: inline-block; margin-top: 10px; }
.security-layout, .split-layout { display: grid; grid-template-columns: 1fr; gap: 22px; align-items: center; }
.security-panel { padding: 24px; border-radius: 26px; background: linear-gradient(145deg, #fff, #eef7ff); border: 1px solid var(--line); box-shadow: var(--shadow); }
.security-list { display: grid; gap: 12px; margin-top: 14px; }
.security-list div { padding: 14px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
.scenario-card { padding: 20px; }
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 18px 20px; }
.faq-item h3 { font-size: 18px; }
.cta-section { margin: 32px 0 0; padding: 32px 20px; text-align: center; border-radius: 30px; background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.96)); border: 1px solid rgba(70,139,223,.18); box-shadow: var(--shadow); }
.cta-section p { max-width: 720px; margin-left: auto; margin-right: auto; }
.page-hero { padding: 48px 0 26px; background: radial-gradient(circle at 15% 0%, rgba(70,139,223,.18), transparent 32%); }
.page-hero .container { max-width: 900px; }
.article-layout { display: grid; grid-template-columns: 1fr; gap: 20px; }
.article-body { padding: 24px; border-radius: 26px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.article-body h2 { margin-top: 22px; font-size: 24px; }
.info-grid { display: grid; gap: 14px; margin-top: 18px; }
.notice { padding: 18px; border-left: 4px solid var(--primary); border-radius: 18px; background: var(--primary-soft); color: #29415d; }
ul.check-list { padding: 0; margin: 16px 0 0; list-style: none; display: grid; gap: 10px; }
ul.check-list li { position: relative; padding-left: 28px; color: #38506d; }
ul.check-list li:before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--primary-dark); font-weight: 900; }
.download-single { margin-top: 22px; }
.site-footer { margin-top: 46px; padding: 38px 0 20px; background: #0f2544; color: #d7e7fb; }
.site-footer p, .site-footer a { color: #b9cce4; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; }
.footer-brand img { width: 36px; height: 36px; border-radius: 12px; }
.site-footer h3 { color: #fff; font-size: 16px; margin-bottom: 10px; }
.site-footer a { display: block; margin: 8px 0; font-size: 14px; }
.footer-bottom { margin-top: 26px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; color: #9fb7d4; }
@media (min-width: 640px) {
    .trust-bar, .category-grid, .feature-grid, .scenario-grid, .recommend-grid, .info-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; background: transparent; border: 0; border-radius: 0; box-shadow: none; }
    .site-nav a { padding: 10px 12px; }
    .hero { padding: 72px 0 58px; }
    .hero-layout { grid-template-columns: 1.06fr .94fr; gap: 52px; }
    .hero-visual { min-height: 500px; }
    .phone-card { margin-top: 52px; width: 310px; }
    .trust-bar { grid-template-columns: repeat(4, 1fr); }
    .category-grid, .feature-grid, .scenario-grid, .recommend-grid { grid-template-columns: repeat(3, 1fr); }
    .security-layout, .split-layout { grid-template-columns: 1fr 1fr; gap: 42px; }
    .path-steps, .steps { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
    .section { padding: 62px 0; }
}
@media (min-width: 1100px) {
    .hero-layout { grid-template-columns: 1fr 480px; }
}