:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fbb;
    --primary-soft: #eaf3ff;
    --ink: #14213d;
    --muted: #64748b;
    --line: rgba(70,139,223,.16);
    --card: rgba(255,255,255,.92);
    --shadow: 0 18px 50px rgba(31, 91, 160, .12);
    --radius: 22px;
}
* {
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}
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 10% 2%, rgba(70,139,223,.24), transparent 32%),
        linear-gradient(180deg, #f4f9ff 0%, #ffffff 48%, #eef6ff 100%);
    min-height: 100vh;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    display: block;
}
.mobile-shell {
    width: 100%;
    max-width: 520px;
    min-height: 100vh;
    margin: 0 auto;
    background:
        linear-gradient(180deg, rgba(255,255,255,.24), rgba(255,255,255,.84)),
        radial-gradient(circle at 85% 6%, rgba(70,139,223,.18), transparent 30%);
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    padding: 14px 16px 10px;
    background: rgba(246,250,255,.86);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(70,139,223,.12);
}
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    font-weight: 800;
    letter-spacing: -.02em;
}
.logo img {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    box-shadow: 0 8px 22px rgba(70,139,223,.22);
}
.header-badge, .tag, .pill {
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(70,139,223,.20);
    background: rgba(255,255,255,.72);
    color: var(--primary-dark);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    padding: 7px 10px;
    white-space: nowrap;
}
.mobile-nav {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 12px 0 2px;
    scrollbar-width: none;
}
.mobile-nav::-webkit-scrollbar {
    display: none;
}
.mobile-nav a {
    flex: 0 0 auto;
    padding: 9px 13px;
    border-radius: 999px;
    color: #456077;
    background: rgba(255,255,255,.62);
    border: 1px solid rgba(70,139,223,.10);
    font-size: 14px;
    font-weight: 700;
}
.mobile-nav a.active {
    color: #fff;
    background: var(--primary);
    box-shadow: 0 10px 24px rgba(70,139,223,.24);
}
.site-main {
    padding: 16px 16px 34px;
}
.hero, .page-hero {
    position: relative;
    overflow: hidden;
    border-radius: 30px;
    padding: 24px 20px;
    background:
        linear-gradient(145deg, rgba(255,255,255,.96) 0%, rgba(232,244,255,.92) 100%),
        radial-gradient(circle at 84% 10%, rgba(70,139,223,.22), transparent 30%);
    border: 1px solid rgba(70,139,223,.18);
    box-shadow: var(--shadow);
}
.hero:before, .page-hero:before {
    content: "";
    position: absolute;
    width: 130px;
    height: 130px;
    border-radius: 42px;
    right: -56px;
    top: -52px;
    background: rgba(70,139,223,.12);
    transform: rotate(18deg);
}
.hero-content, .page-hero-content {
    position: relative;
    z-index: 1;
}
h1, h2, h3, p {
    margin-top: 0;
}
h1 {
    margin-bottom: 12px;
    font-size: 32px;
    line-height: 1.12;
    letter-spacing: -.05em;
}
h2 {
    margin-bottom: 12px;
    font-size: 22px;
    line-height: 1.25;
    letter-spacing: -.03em;
}
h3 {
    margin-bottom: 8px;
    font-size: 17px;
}
p {
    color: var(--muted);
    font-size: 15px;
    line-height: 1.82;
}
.lead {
    color: #324b63;
    font-size: 16px;
    line-height: 1.78;
}
.hero-tags, .tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0;
}
.download-btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    min-height: 52px;
    margin: 12px 0 0;
    border-radius: 18px;
    background: var(--primary);
    color: #fff;
    font-size: 16px;
    font-weight: 800;
    letter-spacing: .02em;
    box-shadow: 0 14px 30px rgba(70,139,223,.28);
    border: 1px solid rgba(255,255,255,.28);
}
.download-btn:active {
    transform: translateY(1px);
}
.hero-visual {
    margin: 22px auto 0;
    position: relative;
    border-radius: 28px;
    padding: 14px;
    background: linear-gradient(180deg, rgba(255,255,255,.8), rgba(234,243,255,.8));
    border: 1px solid rgba(70,139,223,.16);
}
.hero-visual img {
    width: 78%;
    margin: 0 auto;
    filter: drop-shadow(0 22px 34px rgba(35, 89, 154, .16));
}
.metric-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 14px;
}
.metric {
    padding: 12px 8px;
    text-align: center;
    border-radius: 18px;
    background: rgba(255,255,255,.78);
    border: 1px solid rgba(70,139,223,.14);
}
.metric strong {
    display: block;
    color: var(--primary-dark);
    font-size: 17px;
}
.metric span {
    display: block;
    margin-top: 4px;
    color: var(--muted);
    font-size: 11px;
}
.section {
    margin-top: 22px;
}
.section-title {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
}
.section-kicker {
    color: var(--primary-dark);
    font-weight: 800;
    font-size: 13px;
}
.card, .info-card, .faq-item, .step, .download-panel {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: 0 12px 34px rgba(40, 91, 150, .08);
}
.card + .card, .info-card + .info-card, .faq-item + .faq-item, .step + .step {
    margin-top: 12px;
}
.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}
.feature-grid.two {
    grid-template-columns: repeat(2, 1fr);
}
.feature-card {
    padding: 16px;
    min-height: 132px;
}
.icon-dot {
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
    color: #fff;
    background: var(--primary);
    box-shadow: 0 8px 20px rgba(70,139,223,.24);
    font-weight: 900;
}
.soft-panel {
    padding: 18px;
    border-radius: 24px;
    background: linear-gradient(180deg, rgba(232,244,255,.86), rgba(255,255,255,.92));
    border: 1px solid rgba(70,139,223,.16);
}
.check-list, .plain-list, .steps-list {
    padding: 0;
    margin: 0;
    list-style: none;
}
.check-list li, .plain-list li, .steps-list li {
    position: relative;
    padding-left: 26px;
    margin: 10px 0;
    color: #4c647c;
    line-height: 1.72;
    font-size: 14px;
}
.check-list li:before {
    content: "";
    position: absolute;
    left: 0;
    top: 8px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 4px rgba(70,139,223,.12);
}
.steps-list {
    counter-reset: step;
}
.steps-list li:before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 0;
    top: 2px;
    width: 18px;
    height: 18px;
    border-radius: 6px;
    color: #fff;
    background: var(--primary);
    text-align: center;
    line-height: 18px;
    font-size: 12px;
    font-weight: 800;
}
.faq-item h3 {
    padding-right: 8px;
}
.faq-item p {
    margin-bottom: 0;
}
.cta-card {
    text-align: left;
    background:
        linear-gradient(145deg, rgba(70,139,223,.95), rgba(36,95,187,.95)),
        radial-gradient(circle at 90% 0%, rgba(255,255,255,.22), transparent 35%);
    color: #fff;
    border: 0;
}
.cta-card p, .cta-card .section-kicker {
    color: rgba(255,255,255,.82);
}
.cta-card .download-btn {
    background: #fff;
    color: var(--primary-dark);
    box-shadow: 0 12px 30px rgba(17, 42, 77, .18);
}
.page-hero {
    margin-bottom: 18px;
}
.content-page .card p:last-child,
.content-page .info-card p:last-child {
    margin-bottom: 0;
}
.tip-card {
    border-left: 4px solid var(--primary);
}
.download-panel {
    margin-top: 18px;
}
.site-footer {
    padding: 26px 16px 34px;
    border-top: 1px solid rgba(70,139,223,.14);
    background: rgba(247,251,255,.82);
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}
.footer-brand img {
    width: 42px;
    height: 42px;
    border-radius: 14px;
}
.footer-brand p {
    margin: 4px 0 0;
    font-size: 13px;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 14px 0;
}
.footer-links a {
    padding: 8px 11px;
    border-radius: 999px;
    border: 1px solid rgba(70,139,223,.16);
    background: #fff;
    color: #476174;
    font-size: 13px;
}
.risk-note, .copyright {
    font-size: 12px;
    line-height: 1.7;
    margin-bottom: 8px;
}
.desktop-access-notice {
    position: fixed;
    inset: 0;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 26px;
    background: rgba(244,249,255,.86);
    backdrop-filter: blur(12px);
}
.notice-card {
    width: min(420px, 92vw);
    border-radius: 28px;
    padding: 30px;
    text-align: center;
    background: #fff;
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
}
.notice-logo {
    width: 58px;
    height: 58px;
    margin: 0 auto 16px;
    border-radius: 18px;
}
.notice-card strong {
    display: block;
    font-size: 24px;
    margin-bottom: 8px;
}
.desktop-gated .mobile-shell {
    filter: blur(2px);
    pointer-events: none;
    user-select: none;
    max-height: 100vh;
    overflow: hidden;
}
.desktop-gated .download-btn {
    display: none !important;
}
@media (min-width: 560px) {
    body:not(.desktop-gated) .mobile-shell {
        border-left: 1px solid rgba(70,139,223,.12);
        border-right: 1px solid rgba(70,139,223,.12);
    }
}