:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #eaf4ff;
    --text: #102033;
    --muted: #5f6f85;
    --line: rgba(70,139,223,.16);
    --card: rgba(255,255,255,.92);
    --shadow: 0 16px 42px rgba(31,95,174,.12);
    --radius: 22px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 18% 8%, rgba(70,139,223,.22), transparent 32%),
        linear-gradient(180deg, #f4f9ff 0%, #ffffff 42%, #eef7ff 100%);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-shell { width: 100%; min-height: 100vh; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(255,255,255,.78);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(70,139,223,.12);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; letter-spacing: .2px; }
.logo { width: 34px; height: 34px; object-fit: contain; border-radius: 10px; }
.mobile-nav { display: flex; align-items: center; gap: 8px; font-size: 13px; color: #35506d; white-space: nowrap; }
.mobile-nav a { padding: 7px 9px; border-radius: 999px; background: rgba(70,139,223,.08); }
main { padding-bottom: 24px; }
.hero {
    padding: 26px 16px 18px;
    display: grid;
    gap: 18px;
}
.hero-card, .section, .content-page, .download-panel, .pc-gate-card, .footer-card {
    background: var(--card);
    border: 1px solid rgba(255,255,255,.78);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.hero-card { padding: 24px 18px; overflow: hidden; position: relative; }
.hero-card:before {
    content: "";
    position: absolute;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: rgba(70,139,223,.13);
    right: -60px;
    top: -70px;
}
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: var(--primary-soft);
    font-size: 12px;
    font-weight: 700;
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 12px; }
h1 { font-size: 30px; letter-spacing: -1px; }
h2 { font-size: 22px; }
h3 { font-size: 17px; }
p { margin: 0 0 12px; color: var(--muted); }
.hero-desc { font-size: 15px; color: #425873; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    margin-top: 8px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 26px rgba(70,139,223,.28);
    border: 0;
}
.desktop-notice .download-btn { display: none; }
.hero-visual {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 0 8px;
}
.app-frame {
    padding: 12px;
    border-radius: 28px;
    background: linear-gradient(145deg, #ffffff, #e9f4ff);
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: 0 18px 50px rgba(40,93,160,.16);
}
.trust-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 16px; }
.stat { padding: 12px 8px; border-radius: 16px; background: rgba(70,139,223,.08); text-align: center; }
.stat strong { display: block; color: var(--primary-dark); font-size: 17px; }
.stat span { font-size: 11px; color: var(--muted); }
.section { margin: 14px 16px; padding: 20px 16px; }
.section-title { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.card-grid, .feature-grid { display: grid; gap: 12px; }
.card {
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}
.card.soft { background: linear-gradient(180deg, #f4f9ff, #ffffff); }
.card h3 { color: #14385f; }
.list { padding-left: 18px; margin: 8px 0 0; color: var(--muted); }
.list li { margin: 6px 0; }
.faq-item {
    padding: 15px 0;
    border-bottom: 1px solid rgba(70,139,223,.12);
}
.faq-item:last-child { border-bottom: 0; }
.faq-item h3 { margin-bottom: 6px; font-size: 16px; }
.cta-band {
    margin-top: 14px;
    padding: 18px;
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.92));
    border: 1px solid var(--line);
}
.content-page { margin: 18px 16px; padding: 22px 16px; }
.content-page .download-btn { margin-top: 14px; }
.tip-box {
    margin-top: 16px;
    padding: 16px;
    border-radius: 18px;
    background: #f2f8ff;
    border: 1px solid rgba(70,139,223,.18);
}
.steps { counter-reset: step; display: grid; gap: 10px; margin-top: 14px; }
.step {
    position: relative;
    padding: 14px 14px 14px 46px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}
.step:before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 14px;
    top: 14px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: var(--primary);
    color: #fff;
    font-size: 12px;
    font-weight: 800;
}
.site-footer { padding: 16px; }
.footer-card { padding: 18px 16px; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-logo { width: 38px; height: 38px; border-radius: 12px; object-fit: contain; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0; }
.footer-links a { font-size: 13px; color: var(--primary-dark); background: var(--primary-soft); padding: 7px 10px; border-radius: 999px; }
.footer-note { font-size: 12px; margin-bottom: 0; }
.pc-gate {
    position: fixed;
    inset: 0;
    z-index: 999;
    display: grid;
    place-items: center;
    padding: 24px;
    background: linear-gradient(180deg, #f6fbff, #eaf4ff);
}
.pc-gate-card { width: min(460px, 92vw); padding: 28px; text-align: center; }
.pc-gate-logo { width: 56px; height: 56px; object-fit: contain; margin: 0 auto 12px; border-radius: 16px; }
.desktop-notice .site-shell { opacity: .04; pointer-events: none; max-height: 100vh; overflow: hidden; }
@media (min-width: 720px) {
    .site-shell { max-width: 430px; margin: 0 auto; background: rgba(255,255,255,.25); }
    body:not(.desktop-notice) { background: #edf6ff; }
}