:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #eaf3ff;
    --text: #10233f;
    --muted: #5c6f89;
    --line: rgba(70,139,223,.16);
    --white: #ffffff;
    --shadow: 0 14px 36px rgba(31, 95, 174, .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, #f4f9ff 0%, #ffffff 42%, #edf6ff 100%);
    line-height: 1.72;
    font-size: 16px;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-shell { min-height: 100vh; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    padding: 12px 16px 10px;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(70,139,223,.10);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: #0b2a52; }
.logo { width: 34px; height: 34px; object-fit: contain; border-radius: 10px; }
.mobile-nav { margin-top: 12px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.mobile-nav a { text-align: center; padding: 8px 6px; border-radius: 999px; background: #f1f7ff; color: #315678; font-size: 13px; border: 1px solid rgba(70,139,223,.10); }
.mobile-nav .nav-download { background: var(--primary); color: white; }
.banner { padding: 26px 18px 22px; }
.hero-card { border-radius: 28px; padding: 24px 18px; background: radial-gradient(circle at 20% 10%, rgba(70,139,223,.20), transparent 36%), linear-gradient(145deg, #ffffff, #eef7ff); box-shadow: var(--shadow); border: 1px solid rgba(70,139,223,.16); overflow: hidden; }
.eyebrow, .badge { display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; color: var(--primary-dark); background: rgba(70,139,223,.10); border: 1px solid rgba(70,139,223,.14); border-radius: 999px; font-size: 12px; font-weight: 700; }
h1 { margin: 14px 0 12px; font-size: 30px; line-height: 1.18; letter-spacing: -0.6px; color: #0a2447; }
h2 { margin: 0 0 12px; font-size: 22px; line-height: 1.25; color: #102b52; }
h3 { margin: 0 0 8px; font-size: 17px; color: #14335c; }
p { margin: 0 0 12px; color: var(--muted); }
.hero-text { font-size: 16px; color: #3f5876; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 18px; }
.download-btn { display: inline-flex; justify-content: center; align-items: center; width: 100%; min-height: 48px; padding: 13px 20px; border-radius: 999px; background: var(--primary); color: #fff; font-weight: 800; box-shadow: 0 10px 24px rgba(70,139,223,.28); border: 0; }
.hero-visual { margin-top: 24px; position: relative; }
.phone-frame { padding: 14px; border-radius: 30px; background: linear-gradient(180deg, #dfefff, #ffffff); border: 1px solid rgba(70,139,223,.18); box-shadow: 0 18px 48px rgba(31, 95, 174, .12); }
.hero-visual img { width: 86%; margin: 0 auto; border-radius: 24px; }
.float-card { margin-top: -18px; margin-left: auto; width: 72%; padding: 12px; border-radius: 18px; background: rgba(255,255,255,.94); box-shadow: var(--shadow); border: 1px solid rgba(70,139,223,.12); font-size: 13px; color: #315678; }
section { padding: 18px; }
.section-head { margin-bottom: 14px; }
.section-head p { font-size: 15px; }
.card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); margin-bottom: 14px; }
.card.soft { background: linear-gradient(145deg, #f6fbff, #ffffff); }
.feature-grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
.feature-card { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 16px; box-shadow: 0 10px 26px rgba(31, 95, 174, .07); }
.feature-icon { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 12px; background: var(--primary-soft); color: var(--primary-dark); margin-bottom: 10px; font-weight: 800; }
.data-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 14px; }
.data-box { padding: 12px 8px; border-radius: 18px; background: #f3f8ff; text-align: center; border: 1px solid rgba(70,139,223,.12); }
.data-box strong { display: block; color: var(--primary-dark); font-size: 18px; }
.data-box span { font-size: 12px; color: var(--muted); }
.faq-item { padding: 16px; border-radius: 18px; background: #fff; border: 1px solid var(--line); margin-bottom: 12px; box-shadow: 0 8px 20px rgba(31,95,174,.06); }
.faq-item h3 { font-size: 16px; }
.notice { padding: 14px; border-radius: 18px; background: #eef7ff; border: 1px solid rgba(70,139,223,.18); color: #315678; margin: 14px 0; }
.steps { counter-reset: step; display: grid; gap: 12px; }
.step { position: relative; padding: 15px 15px 15px 48px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: 0 8px 20px rgba(31,95,174,.06); }
.step:before { counter-increment: step; content: counter(step); position: absolute; left: 14px; top: 15px; width: 24px; height: 24px; border-radius: 50%; background: var(--primary); color: white; display: grid; place-items: center; font-size: 13px; font-weight: 800; }
.cta-panel { padding: 20px; border-radius: 26px; background: linear-gradient(145deg, var(--primary), #7db5f2); color: white; box-shadow: 0 16px 38px rgba(70,139,223,.22); }
.cta-panel h2, .cta-panel p { color: white; }
.cta-panel .download-btn { background: white; color: var(--primary-dark); box-shadow: none; }
.site-footer { padding: 20px 18px 32px; }
.footer-card { background: #0d2748; color: #d7e8ff; border-radius: 24px; padding: 20px; }
.footer-card p, .footer-card small { color: #b9cce3; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.footer-brand img { width: 30px; height: 30px; border-radius: 10px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; margin: 12px 0; }
.footer-links a { color: #fff; font-size: 13px; padding: 6px 10px; background: rgba(255,255,255,.10); border-radius: 999px; }
.desktop-gate { position: fixed; inset: 0; z-index: 999; display: grid; place-items: center; padding: 24px; background: linear-gradient(180deg, #f4f9ff, #ffffff); }
.desktop-gate-card { max-width: 420px; padding: 34px; background: #fff; border-radius: 28px; box-shadow: var(--shadow); text-align: center; border: 1px solid rgba(70,139,223,.16); }
.gate-logo { width: 54px; height: 54px; margin: 0 auto 12px; border-radius: 16px; }
.desktop-locked .site-shell { opacity: .02; pointer-events: none; }
.desktop-locked .download-btn, .desktop-locked .nav-download { display: none; }
@media (min-width: 720px) {
    body { max-width: 520px; margin: 0 auto; background: #f4f9ff; }
    .site-shell { background: linear-gradient(180deg, #f4f9ff 0%, #ffffff 44%, #edf6ff 100%); }
}