:root {
    --primary: rgb(70,139,223);
    --primary-deep: #225d9f;
    --primary-soft: #eef6ff;
    --primary-mid: #dceeff;
    --ink: #102033;
    --muted: #5f7188;
    --line: rgba(70,139,223,.16);
    --card: rgba(255,255,255,.92);
    --shadow: 0 14px 36px rgba(34, 93, 159, .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(--ink);
    background:
        radial-gradient(circle at 18% 0%, rgba(70,139,223,.20), transparent 32%),
        linear-gradient(180deg, #f2f8ff 0%, #ffffff 42%, #f7fbff 100%);
    min-height: 100vh;
    line-height: 1.72;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

.page-shell {
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
    min-height: 100vh;
    background: linear-gradient(180deg, rgba(255,255,255,.64), rgba(255,255,255,.98));
}

.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,.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(70,139,223,.10);
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 118px;
    font-weight: 800;
    letter-spacing: -.02em;
    color: #17324d;
}

.logo {
    width: 34px;
    height: 34px;
    border-radius: 12px;
    box-shadow: 0 8px 18px rgba(70,139,223,.18);
}

.mobile-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    white-space: nowrap;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}

.mobile-nav::-webkit-scrollbar {
    display: none;
}

.mobile-nav a {
    font-size: 13px;
    color: var(--muted);
    padding: 7px 10px;
    border-radius: 999px;
    background: rgba(70,139,223,.06);
}

.mobile-nav a.active,
.mobile-nav a:hover {
    color: #fff;
    background: var(--primary);
}

.site-main {
    padding: 16px;
}

.banner,
.hero {
    position: relative;
    overflow: hidden;
    border-radius: 28px;
    padding: 24px 18px;
    background:
        linear-gradient(145deg, rgba(70,139,223,.18), rgba(255,255,255,.94) 48%, rgba(220,238,255,.86)),
        #fff;
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.banner::after,
.hero::after {
    content: "";
    position: absolute;
    right: -40px;
    top: -40px;
    width: 150px;
    height: 150px;
    border-radius: 999px;
    background: rgba(70,139,223,.12);
}

.banner h1,
.hero h1,
.page-title h1 {
    position: relative;
    margin: 0 0 12px;
    font-size: 30px;
    line-height: 1.15;
    letter-spacing: -.05em;
    color: #102846;
}

.banner p,
.hero p,
.page-title p {
    position: relative;
    margin: 0 0 18px;
    color: var(--muted);
    font-size: 15px;
}

.banner-grid {
    position: relative;
    display: grid;
    gap: 20px;
}

.product-visual {
    position: relative;
    margin: 4px auto 0;
    width: min(86%, 330px);
    border-radius: 34px;
}

.product-visual img {
    display: block;
    filter: drop-shadow(0 22px 28px rgba(33,76,126,.18));
}

.badge-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 14px 0 18px;
}

.badge,
.tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border-radius: 999px;
    padding: 7px 10px;
    font-size: 12px;
    font-weight: 700;
    color: var(--primary-deep);
    background: rgba(70,139,223,.10);
    border: 1px solid rgba(70,139,223,.12);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 22px;
    border-radius: 999px;
    background: rgb(70,139,223);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(70,139,223,.24);
    border: 0;
    cursor: pointer;
    transition: transform .18s ease, box-shadow .18s ease;
}

.download-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 26px rgba(70,139,223,.28);
}

.section {
    margin-top: 18px;
    padding: 20px 0 0;
}

.section-header {
    margin-bottom: 12px;
}

.section-kicker {
    display: inline-block;
    margin-bottom: 6px;
    color: var(--primary);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.section h2 {
    margin: 0;
    font-size: 23px;
    letter-spacing: -.035em;
    color: #12263d;
}

.section p {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 15px;
}

.card {
    margin-top: 12px;
    padding: 16px;
    border-radius: var(--radius);
    background: var(--card);
    border: 1px solid var(--line);
    box-shadow: 0 10px 28px rgba(38,82,130,.07);
}

.card h3 {
    margin: 0 0 8px;
    font-size: 17px;
    color: #132c49;
}

.card p,
.card li {
    color: var(--muted);
    font-size: 14px;
}

.card ul,
.card ol {
    margin: 10px 0 0;
    padding-left: 20px;
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.feature-card {
    padding: 16px;
    border-radius: 20px;
    background: linear-gradient(180deg, #fff, #f3f9ff);
    border: 1px solid rgba(70,139,223,.14);
    box-shadow: 0 10px 24px rgba(70,139,223,.06);
}

.feature-card .icon {
    width: 38px;
    height: 38px;
    display: inline-grid;
    place-items: center;
    margin-bottom: 10px;
    border-radius: 14px;
    background: rgba(70,139,223,.12);
    color: var(--primary-deep);
    font-weight: 900;
}

.feature-card h3 {
    margin: 0 0 6px;
    font-size: 16px;
}

.feature-card p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.data-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 14px;
}

.data-block {
    padding: 12px 8px;
    border-radius: 18px;
    background: rgba(255,255,255,.78);
    border: 1px solid rgba(70,139,223,.14);
    text-align: center;
}

.data-block strong {
    display: block;
    color: var(--primary-deep);
    font-size: 18px;
}

.data-block span {
    display: block;
    color: var(--muted);
    font-size: 11px;
}

.faq-item {
    padding: 16px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid rgba(70,139,223,.14);
    box-shadow: 0 8px 22px rgba(33,76,126,.06);
}

.faq-item + .faq-item {
    margin-top: 12px;
}

.faq-item h3 {
    margin: 0 0 8px;
    font-size: 16px;
    color: #12263d;
}

.faq-item p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.steps {
    display: grid;
    gap: 12px;
    counter-reset: step;
}

.step {
    position: relative;
    padding: 16px 16px 16px 58px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid rgba(70,139,223,.14);
}

.step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 16px;
    top: 16px;
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}

.step h3 {
    margin: 0 0 4px;
    font-size: 16px;
}

.step p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.notice {
    padding: 15px;
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(70,139,223,.10), rgba(255,255,255,.88));
    border: 1px solid rgba(70,139,223,.16);
}

.notice strong {
    color: var(--primary-deep);
}

.link-grid {
    display: grid;
    gap: 10px;
}

.link-card {
    padding: 14px;
    border-radius: 18px;
    background: rgba(70,139,223,.08);
    border: 1px solid rgba(70,139,223,.13);
    color: #1c4b7c;
    font-weight: 700;
}

.desktop-gate {
    padding: 18px 16px 0;
}

.gate-card {
    padding: 18px;
    border-radius: 24px;
    background: #fff;
    border: 1px solid rgba(70,139,223,.18);
    box-shadow: var(--shadow);
}

.gate-card h1 {
    margin: 10px 0 8px;
    font-size: 24px;
}

.gate-card p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.desktop-limited .download-btn {
    display: none !important;
}

.desktop-limited .site-main {
    max-height: 520px;
    overflow: hidden;
}

.desktop-limited .site-main::after {
    content: "";
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: 170px;
    background: linear-gradient(180deg, rgba(247,251,255,0), #f7fbff 74%);
    pointer-events: none;
}

.site-footer {
    padding: 4px 16px 24px;
}

.footer-card {
    padding: 18px;
    border-radius: 24px;
    background: #102846;
    color: rgba(255,255,255,.78);
}

.footer-logo {
    width: 38px;
    height: 38px;
    border-radius: 14px;
}

.footer-card p {
    margin: 10px 0;
    font-size: 13px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin: 14px 0;
}

.footer-links a {
    padding: 10px;
    border-radius: 14px;
    background: rgba(255,255,255,.08);
    color: #fff;
    font-size: 13px;
}

.copyright {
    color: rgba(255,255,255,.54);
}

@media (min-width: 521px) {
    body {
        background:
            radial-gradient(circle at 20% 4%, rgba(70,139,223,.18), transparent 28%),
            linear-gradient(180deg, #eff7ff, #ffffff);
    }

    .page-shell {
        box-shadow: 0 0 80px rgba(32,86,150,.10);
    }
}