* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #225fbd;
    --primary-soft: #eaf4ff;
    --ink: #132238;
    --muted: #617086;
    --line: rgba(70,139,223,.16);
    --card: rgba(255,255,255,.88);
    --radius: 20px;
    --shadow: 0 14px 38px rgba(31,82,146,.10);
}

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 14% 0%, rgba(70,139,223,.20), transparent 28%),
        radial-gradient(circle at 95% 14%, rgba(70,139,223,.16), transparent 32%),
        linear-gradient(180deg, #f5fbff 0%, #ffffff 42%, #f7fbff 100%);
    line-height: 1.7;
    min-height: 100vh;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(70,139,223,.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(70,139,223,.055) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: linear-gradient(180deg, rgba(0,0,0,.68), transparent 76%);
}

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

img {
    max-width: 100%;
    display: block;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    padding: 10px 14px 8px;
    background: rgba(246,251,255,.86);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(70,139,223,.10);
}

.header-inner {
    max-width: 480px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 9px;
    font-weight: 800;
    letter-spacing: .02em;
    color: #102844;
}

.logo img {
    width: 34px;
    height: 34px;
    border-radius: 12px;
    box-shadow: 0 8px 18px rgba(70,139,223,.22);
}

.mobile-nav {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    scrollbar-width: none;
    margin-top: 10px;
    padding-bottom: 2px;
}

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

.nav-link {
    flex: 0 0 auto;
    padding: 7px 12px;
    border-radius: 999px;
    color: #4d6077;
    font-size: 13px;
    background: rgba(255,255,255,.68);
    border: 1px solid rgba(70,139,223,.10);
}

.nav-link.active {
    color: #fff;
    background: var(--primary);
    box-shadow: 0 8px 18px rgba(70,139,223,.23);
}

.site-main {
    max-width: 480px;
    margin: 0 auto;
    padding: 18px 16px 22px;
    position: relative;
    z-index: 1;
}

.banner,
.page-hero {
    position: relative;
    overflow: hidden;
    border-radius: 28px;
    padding: 24px 18px;
    background:
        linear-gradient(145deg, rgba(255,255,255,.96), rgba(232,244,255,.86)),
        radial-gradient(circle at 75% 18%, rgba(70,139,223,.18), transparent 38%);
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.banner::after,
.page-hero::after {
    content: "";
    position: absolute;
    width: 150px;
    height: 150px;
    right: -72px;
    bottom: -80px;
    border-radius: 50%;
    background: rgba(70,139,223,.14);
}

.banner h1,
.page-hero h1 {
    position: relative;
    z-index: 1;
    margin: 12px 0 12px;
    font-size: 30px;
    line-height: 1.18;
    letter-spacing: -.04em;
    color: #102136;
}

.page-hero h1 {
    font-size: 28px;
}

.lead {
    position: relative;
    z-index: 1;
    margin: 0 0 18px;
    color: #516176;
    font-size: 15px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 10px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: rgba(70,139,223,.10);
    border: 1px solid rgba(70,139,223,.13);
    font-size: 12px;
    font-weight: 700;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-size: 16px;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(70,139,223,.28);
    border: 1px solid rgba(255,255,255,.22);
    transition: transform .2s ease, box-shadow .2s ease;
}

.download-btn:active {
    transform: translateY(1px) scale(.99);
    box-shadow: 0 8px 18px rgba(70,139,223,.22);
}

.hero-visual {
    margin-top: 22px;
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.app-frame {
    margin: 0 auto;
    width: min(250px, 86%);
    padding: 12px;
    border-radius: 34px;
    background: linear-gradient(180deg, #ffffff, #edf6ff);
    box-shadow: 0 22px 46px rgba(31,82,146,.16);
    border: 1px solid rgba(70,139,223,.16);
}

.app-frame img {
    border-radius: 26px;
}

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

.badge,
.tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    color: #265d99;
    background: rgba(70,139,223,.10);
    border: 1px solid rgba(70,139,223,.12);
}

.section {
    margin-top: 24px;
}

.section h2 {
    margin: 0 0 12px;
    font-size: 22px;
    line-height: 1.28;
    letter-spacing: -.02em;
}

.section p {
    margin: 0 0 12px;
    color: #53637a;
    font-size: 15px;
}

.card,
.info-card,
.faq-item,
.step-card {
    background: var(--card);
    border: 1px solid rgba(70,139,223,.12);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: 0 12px 28px rgba(31,82,146,.07);
}

.card + .card,
.info-card + .info-card,
.faq-item + .faq-item,
.step-card + .step-card {
    margin-top: 12px;
}

.card h3,
.info-card h3,
.step-card h3 {
    margin: 0 0 8px;
    font-size: 17px;
}

.card p,
.info-card p,
.step-card p {
    margin: 0;
}

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

.feature-card {
    min-height: 120px;
    background: linear-gradient(180deg, #ffffff, #f0f7ff);
}

.data-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0,1fr));
    gap: 12px;
}

.data-block {
    padding: 14px;
    border-radius: 18px;
    background: rgba(70,139,223,.09);
    border: 1px solid rgba(70,139,223,.12);
}

.data-block strong {
    display: block;
    color: var(--primary-dark);
    font-size: 20px;
    line-height: 1;
    margin-bottom: 7px;
}

.data-block span {
    color: #59708a;
    font-size: 12px;
}

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

.faq-item p {
    margin: 0;
    color: #53637a;
}

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

.step-card {
    position: relative;
    padding-left: 54px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 16px;
    top: 18px;
    width: 26px;
    height: 26px;
    border-radius: 9px;
    display: grid;
    place-items: center;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
    font-size: 13px;
}

.notice {
    padding: 16px;
    border-radius: 20px;
    color: #315879;
    background: linear-gradient(180deg, rgba(70,139,223,.11), rgba(70,139,223,.06));
    border: 1px solid rgba(70,139,223,.14);
}

.notice strong {
    display: block;
    color: #17426d;
    margin-bottom: 5px;
}

.cta-panel {
    text-align: center;
    padding: 20px 16px;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(70,139,223,.13), rgba(255,255,255,.94));
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.cta-panel .download-btn {
    margin-top: 8px;
}

.breadcrumb {
    margin: 4px 0 12px;
    color: #6b7c91;
    font-size: 12px;
}

.site-footer {
    max-width: 480px;
    margin: 10px auto 0;
    padding: 24px 16px 32px;
    color: #617086;
    position: relative;
    z-index: 1;
}

.footer-brand {
    padding: 16px;
    border-radius: 22px;
    background: rgba(255,255,255,.68);
    border: 1px solid rgba(70,139,223,.10);
}

.footer-brand img {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    margin-bottom: 8px;
}

.footer-brand p {
    margin: 6px 0 0;
    font-size: 13px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    padding: 16px 2px 10px;
    font-size: 13px;
}

.footer-links a {
    color: #345c86;
}

.copyright {
    margin: 0;
    font-size: 12px;
}

.pc-access-panel {
    display: none;
}

.desktop-visitor {
    overflow: hidden;
}

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

.desktop-visitor .pc-access-panel {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(245,251,255,.94);
    backdrop-filter: blur(10px);
}

.pc-access-card {
    max-width: 360px;
    width: 100%;
    text-align: center;
    padding: 28px 22px;
    border-radius: 26px;
    background: #fff;
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}

.pc-access-card .pc-logo {
    width: 56px;
    height: 56px;
    margin: 0 auto 12px;
    border-radius: 18px;
}

.pc-access-card h1 {
    margin: 0 0 8px;
    font-size: 24px;
}

.pc-access-card p {
    margin: 0;
    color: #5e7186;
}

.desktop-visitor .site-header,
.desktop-visitor .site-main,
.desktop-visitor .site-footer {
    filter: blur(2px);
    opacity: .16;
    pointer-events: none;
    user-select: none;
}

@media (min-width: 520px) {
    body {
        background: #f5fbff;
    }
}