:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fba;
    --primary-soft: #eaf4ff;
    --ink: #142033;
    --muted: #66748a;
    --line: rgba(70,139,223,.16);
    --card: rgba(255,255,255,.92);
    --shadow: 0 14px 38px rgba(34, 82, 138, .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:
        radial-gradient(circle at 18% 0%, rgba(70,139,223,.20), transparent 34%),
        linear-gradient(180deg, #f3f9ff 0%, #ffffff 42%, #f7fbff 100%);
    line-height: 1.72;
    font-size: 16px;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-shell { width: 100%; max-width: 720px; margin: 0 auto; min-height: 100vh; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    background: rgba(247,251,255,.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(70,139,223,.12);
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 800; color: #123057; letter-spacing: .2px; }
.logo { width: 34px; height: 34px; border-radius: 10px; object-fit: contain; }
.mobile-nav { display: flex; align-items: center; gap: 4px; padding: 4px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.76); }
.mobile-nav a { padding: 6px 9px; border-radius: 999px; font-size: 13px; color: var(--muted); white-space: nowrap; }
.mobile-nav a.active { color: #fff; background: var(--primary); }
main { padding: 10px 16px 28px; }
.banner {
    position: relative;
    overflow: hidden;
    padding: 24px 18px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,.96), rgba(232,244,255,.96));
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,.8);
}
.banner:before {
    content: "";
    position: absolute;
    width: 180px;
    height: 180px;
    right: -70px;
    top: -60px;
    border-radius: 50%;
    background: rgba(70,139,223,.16);
}
.banner h1, .page-hero h1 { margin: 8px 0 12px; font-size: 30px; line-height: 1.16; letter-spacing: -.8px; }
.banner p, .page-hero p { margin: 0 0 18px; color: var(--muted); }
.badge-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.badge { display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; border-radius: 999px; background: rgba(70,139,223,.10); color: #245fba; font-size: 12px; font-weight: 700; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 12px 22px;
    border-radius: 999px;
    color: #fff;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    box-shadow: 0 12px 24px rgba(70,139,223,.26);
    border: 0;
}
.pc-view .download-btn { display: none; }
.hero-device { margin-top: 18px; padding: 12px; border-radius: 28px; background: linear-gradient(180deg, rgba(255,255,255,.8), rgba(232,244,255,.82)); border: 1px solid rgba(70,139,223,.14); }
.hero-device img { width: 78%; max-width: 280px; margin: 0 auto; filter: drop-shadow(0 18px 24px rgba(26,70,130,.16)); }
.section { margin-top: 22px; padding: 20px 0 0; }
.section-title { margin: 0 0 10px; font-size: 23px; line-height: 1.28; letter-spacing: -.3px; }
.section-lead { margin: 0 0 14px; color: var(--muted); }
.card {
    background: var(--card);
    border: 1px solid rgba(70,139,223,.12);
    border-radius: var(--radius);
    padding: 17px;
    box-shadow: 0 10px 28px rgba(30,76,126,.08);
    margin: 12px 0;
}
.card h2, .card h3 { margin: 0 0 8px; line-height: 1.32; }
.card p { margin: 0 0 10px; color: var(--muted); }
.card p:last-child { margin-bottom: 0; }
.feature-grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
.feature-card { background: #fff; border-radius: 20px; padding: 16px; border: 1px solid var(--line); box-shadow: 0 8px 22px rgba(30,76,126,.07); }
.feature-card strong { display: block; margin-bottom: 5px; font-size: 17px; }
.feature-card span { color: var(--muted); font-size: 14px; }
.data-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 16px 0; }
.data-block { padding: 13px; background: rgba(70,139,223,.08); border-radius: 18px; border: 1px solid rgba(70,139,223,.12); }
.data-block strong { display: block; color: var(--primary-dark); font-size: 19px; }
.data-block span { color: var(--muted); font-size: 12px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 15px; margin: 10px 0; }
.faq-item h2, .faq-item h3 { margin: 0 0 6px; font-size: 17px; }
.faq-item p { margin: 0; color: var(--muted); }
.page-hero { padding: 24px 18px; border-radius: 28px; background: linear-gradient(145deg, #fff, #edf6ff); border: 1px solid rgba(70,139,223,.12); box-shadow: var(--shadow); }
.steps { counter-reset: step; padding: 0; margin: 12px 0; list-style: none; }
.steps li { position: relative; padding: 14px 14px 14px 48px; margin: 10px 0; background: #fff; border: 1px solid var(--line); border-radius: 18px; color: var(--muted); }
.steps li:before { counter-increment: step; content: counter(step); position: absolute; left: 14px; top: 13px; width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; background: var(--primary); color: #fff; font-weight: 800; font-size: 13px; }
.notice { padding: 15px; border-radius: 20px; background: rgba(70,139,223,.10); border: 1px solid rgba(70,139,223,.16); color: #24445f; }
.cta-panel { text-align: center; padding: 22px 17px; border-radius: 26px; background: linear-gradient(145deg, rgba(70,139,223,.12), rgba(255,255,255,.95)); border: 1px solid rgba(70,139,223,.15); margin-top: 18px; }
.site-footer { padding: 8px 16px 28px; }
.footer-card { padding: 18px; border-radius: 24px; background: #fff; border: 1px solid var(--line); color: var(--muted); }
.footer-brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.footer-logo { width: 36px; height: 36px; border-radius: 10px; object-fit: contain; }
.footer-brand p, .footer-note { margin: 2px 0 0; font-size: 13px; color: var(--muted); }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0; }
.footer-links a { color: var(--primary-dark); font-size: 13px; background: var(--primary-soft); padding: 6px 10px; border-radius: 999px; }
.pc-notice { position: fixed; inset: 0; z-index: 999; display: grid; place-items: center; padding: 22px; background: rgba(244,249,255,.94); backdrop-filter: blur(8px); }
.pc-notice-card { width: min(420px, 92vw); text-align: center; padding: 28px; border-radius: 28px; background: #fff; box-shadow: var(--shadow); border: 1px solid var(--line); }
.pc-notice-logo { width: 54px; height: 54px; margin: 0 auto 10px; border-radius: 16px; object-fit: contain; }
.pc-notice-card h1 { margin: 0 0 10px; font-size: 25px; }
.pc-notice-card p { margin: 0; color: var(--muted); }
@media (min-width: 721px) {
    .site-shell { max-width: 720px; }
}