* {
    box-sizing: border-box;
}
:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1e5ea8;
    --primary-soft: #eaf3ff;
    --text: #102033;
    --muted: #65758b;
    --line: rgba(70,139,223,.16);
    --card: rgba(255,255,255,.92);
    --shadow: 0 12px 34px rgba(36, 91, 160, .10);
    --radius: 22px;
}
html {
    background: #eef6ff;
    -webkit-text-size-adjust: 100%;
}
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% 0%, rgba(70,139,223,.22), transparent 30%),
        linear-gradient(180deg, #f7fbff 0%, #edf6ff 44%, #ffffff 100%);
    min-height: 100vh;
    line-height: 1.72;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    display: block;
}
.site-shell {
    width: 100%;
    max-width: 560px;
    margin: 0 auto;
    min-height: 100vh;
    overflow: hidden;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px 12px;
    background: rgba(248, 252, 255, .92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(70,139,223,.12);
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 116px;
    font-weight: 800;
    color: #18395e;
    letter-spacing: .2px;
}
.logo img {
    width: 34px;
    height: 34px;
    border-radius: 10px;
}
.mobile-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px;
    border: 1px solid rgba(70,139,223,.12);
    border-radius: 999px;
    background: #fff;
    box-shadow: 0 8px 20px rgba(70,139,223,.06);
}
.mobile-nav a {
    padding: 6px 9px;
    border-radius: 999px;
    color: #33506d;
    font-size: 13px;
    white-space: nowrap;
}
.mobile-nav a:active {
    background: var(--primary-soft);
}
.banner {
    position: relative;
    padding: 24px 16px 18px;
}
.hero-card {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(70,139,223,.15);
    border-radius: 30px;
    padding: 26px 18px 20px;
    background:
        linear-gradient(135deg, rgba(255,255,255,.96), rgba(235,246,255,.9)),
        radial-gradient(circle at 86% 12%, rgba(70,139,223,.20), transparent 36%);
    box-shadow: var(--shadow);
}
.hero-card::after {
    content: "";
    position: absolute;
    width: 156px;
    height: 156px;
    right: -66px;
    top: -54px;
    border-radius: 50%;
    background: rgba(70,139,223,.16);
}
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 6px 10px;
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 999px;
    background: rgba(255,255,255,.72);
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 700;
}
h1, h2, h3 {
    margin: 0;
    line-height: 1.28;
    color: #102033;
}
h1 {
    margin-top: 14px;
    font-size: 30px;
    letter-spacing: -.5px;
}
h2 {
    font-size: 22px;
    margin-bottom: 12px;
}
h3 {
    font-size: 17px;
    margin-bottom: 7px;
}
.lead {
    margin: 14px 0 0;
    color: #4d6178;
    font-size: 15.5px;
}
.hero-visual {
    margin-top: 18px;
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    gap: 12px;
    align-items: center;
}
.badge-stack {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.security-badge {
    display: inline-flex;
    width: fit-content;
    align-items: center;
    gap: 6px;
    border-radius: 14px;
    padding: 8px 10px;
    background: rgba(70,139,223,.10);
    color: #1f5f9f;
    font-size: 12.5px;
    font-weight: 700;
}
.app-shot {
    width: 142px;
    justify-self: end;
    filter: drop-shadow(0 18px 22px rgba(35, 92, 158, .18));
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    margin-top: 18px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    font-size: 16px;
    box-shadow: 0 14px 26px rgba(70,139,223,.28);
    border: 0;
    appearance: none;
}
.download-btn:active {
    transform: translateY(1px);
}
.section {
    padding: 18px 16px;
}
.section.soft {
    background: linear-gradient(180deg, rgba(234,243,255,.36), rgba(255,255,255,0));
}
.card {
    border: 1px solid rgba(70,139,223,.13);
    border-radius: var(--radius);
    background: var(--card);
    box-shadow: var(--shadow);
    padding: 18px;
    margin-bottom: 12px;
}
.card.blue {
    background: linear-gradient(135deg, #eef7ff, #ffffff);
}
.card p, .section p {
    margin: 0 0 11px;
    color: #52677d;
    font-size: 15px;
}
.card p:last-child, .section p:last-child {
    margin-bottom: 0;
}
.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}
.feature-card {
    padding: 16px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 8px 24px rgba(70,139,223,.08);
}
.feature-card .icon {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
    margin-bottom: 10px;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 9px;
    margin-top: 14px;
}
.stat {
    padding: 13px 8px;
    text-align: center;
    border-radius: 18px;
    background: #f4f9ff;
    border: 1px solid rgba(70,139,223,.12);
}
.stat strong {
    display: block;
    color: var(--primary-dark);
    font-size: 19px;
    line-height: 1.2;
}
.stat span {
    color: #6b7c8f;
    font-size: 12px;
}
.steps {
    counter-reset: step;
    display: grid;
    gap: 10px;
}
.step {
    position: relative;
    padding: 15px 15px 15px 48px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid rgba(70,139,223,.12);
}
.step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 14px;
    top: 16px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: grid;
    place-items: center;
    font-size: 13px;
    font-weight: 800;
}
.notice {
    border-left: 4px solid var(--primary);
    background: #f2f8ff;
    border-radius: 18px;
    padding: 15px;
    color: #496276;
}
.faq-item {
    padding: 16px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid rgba(70,139,223,.13);
    box-shadow: 0 8px 24px rgba(70,139,223,.07);
    margin-bottom: 12px;
}
.faq-item h3 {
    font-size: 16px;
    color: #163858;
}
.faq-item p {
    color: #5a6f82;
    margin: 0;
}
.cta-card {
    margin: 18px 16px 22px;
    padding: 22px 18px;
    text-align: center;
    border-radius: 26px;
    background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.96));
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}
.page-hero {
    padding: 24px 16px 10px;
}
.page-hero .card {
    margin-bottom: 0;
}
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}
.tag {
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(70,139,223,.10);
    color: #1f609c;
    font-size: 12px;
    font-weight: 700;
}
.site-footer {
    padding: 22px 16px 30px;
    border-top: 1px solid rgba(70,139,223,.12);
    background: rgba(255,255,255,.76);
}
.footer-brand {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}
.footer-brand img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
}
.footer-brand p {
    margin: 2px 0 0;
    color: var(--muted);
    font-size: 13px;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 14px;
    margin: 16px 0;
}
.footer-links a {
    color: #42617e;
    font-size: 13px;
}
.copyright {
    color: #7a8a9b;
    font-size: 12px;
    margin: 0;
}
.desktop-access-tip {
    display: none;
}
.desktop-human {
    background: #f3f8ff;
}
.desktop-human .desktop-access-tip {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 28px;
    text-align: center;
    background: linear-gradient(180deg, #f7fbff, #e9f4ff);
}
.desktop-human .desktop-access-tip img {
    width: 64px;
    height: 64px;
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.desktop-human .desktop-access-tip h1 {
    margin-top: 6px;
    font-size: 26px;
}
.desktop-human .desktop-access-tip p {
    max-width: 420px;
    margin: 0;
    color: #5f7286;
}
.desktop-human .site-shell {
    display: none;
}
.desktop-human .download-btn {
    display: none;
}
@media (min-width: 420px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    h1 {
        font-size: 34px;
    }
    .app-shot {
        width: 158px;
    }
}