:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(39, 88, 161);
    --primary-soft: rgba(70,139,223,0.12);
    --bg: #f6f9ff;
    --text: #172033;
    --muted: #5f6f88;
    --line: rgba(62, 100, 160, 0.14);
    --white: #ffffff;
    --radius: 22px;
    --shadow: 0 18px 50px rgba(49, 90, 150, 0.12);
}

* {
    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(--text);
    background:
        radial-gradient(circle at 15% 8%, rgba(70,139,223,0.15), transparent 30%),
        linear-gradient(180deg, #eef6ff 0%, #ffffff 44%, #f7fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

.container {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand,
.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--primary-dark);
    letter-spacing: 0.2px;
}

.logo {
    width: 38px;
    height: 38px;
    object-fit: contain;
}

.footer-logo {
    width: 34px;
    height: 34px;
    object-fit: contain;
}

.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    background: var(--white);
    border-radius: 14px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    border-radius: 2px;
    background: var(--primary-dark);
}

.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(255,255,255,0.98);
    box-shadow: var(--shadow);
}

.site-nav.open {
    display: grid;
    gap: 6px;
}

.site-nav a {
    padding: 11px 13px;
    border-radius: 14px;
    color: var(--muted);
    font-size: 15px;
}

.site-nav a.active,
.site-nav a:hover {
    color: var(--primary-dark);
    background: var(--primary-soft);
}

.hero {
    padding: 48px 0 42px;
}

.hero-grid {
    display: grid;
    gap: 30px;
    align-items: center;
}

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border: 1px solid rgba(70,139,223,0.22);
    border-radius: 999px;
    background: rgba(255,255,255,0.78);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 13px;
}

.hero h1,
.page-hero h1 {
    margin: 18px 0 14px;
    font-size: clamp(34px, 8vw, 64px);
    line-height: 1.08;
    letter-spacing: -1.8px;
}

.hero p,
.page-hero p,
.section-lead {
    margin: 0;
    color: var(--muted);
    font-size: 17px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 26px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 800;
    border: 1px solid rgba(70,139,223,0.4);
    box-shadow: 0 12px 28px rgba(70,139,223,0.26);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
    cursor: pointer;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: rgb(58, 126, 207);
    box-shadow: 0 16px 34px rgba(70,139,223,0.32);
}

.text-link {
    color: var(--primary-dark);
    font-weight: 700;
}

.trust-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.trust-pill {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,0.10);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}

.hero-device {
    position: relative;
    padding: 18px;
    border-radius: 30px;
    background:
        linear-gradient(145deg, rgba(255,255,255,0.95), rgba(226,240,255,0.78));
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
}

.hero-device:before {
    content: "";
    position: absolute;
    inset: 12% -5% auto auto;
    width: 130px;
    height: 130px;
    border-radius: 50%;
    background: rgba(70,139,223,0.14);
    filter: blur(18px);
}

.app-image {
    margin: 0 auto;
    max-height: 520px;
    object-fit: contain;
    position: relative;
    z-index: 1;
}

.stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 22px;
}

.stat-card {
    border-radius: 18px;
    background: rgba(255,255,255,0.86);
    border: 1px solid var(--line);
    padding: 16px;
}

.stat-card strong {
    display: block;
    color: var(--primary-dark);
    font-size: 22px;
    line-height: 1.2;
}

.stat-card span {
    color: var(--muted);
    font-size: 13px;
}

.section {
    padding: 38px 0;
}

.section-header {
    margin-bottom: 20px;
}

.section-header h2 {
    margin: 0 0 10px;
    font-size: clamp(26px, 5vw, 40px);
    line-height: 1.2;
    letter-spacing: -0.8px;
}

.grid,
.feature-grid,
.card-grid {
    display: grid;
    gap: 16px;
}

.card {
    padding: 22px;
    border-radius: var(--radius);
    background: rgba(255,255,255,0.86);
    border: 1px solid var(--line);
    box-shadow: 0 14px 42px rgba(49, 90, 150, 0.08);
}

.card.soft {
    background: linear-gradient(180deg, rgba(234,244,255,0.92), rgba(255,255,255,0.88));
}

.card h2,
.card h3 {
    margin-top: 0;
    line-height: 1.28;
}

.card p {
    color: var(--muted);
    margin-bottom: 0;
}

.icon-bubble {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 14px;
}

.page-hero {
    padding: 46px 0 24px;
}

.page-hero-inner {
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: 28px;
    background:
        linear-gradient(135deg, rgba(255,255,255,0.96), rgba(232,243,255,0.85));
    box-shadow: var(--shadow);
}

.article-layout {
    display: grid;
    gap: 18px;
    padding-bottom: 48px;
}

.article-content {
    display: grid;
    gap: 18px;
}

.info-list {
    display: grid;
    gap: 12px;
    margin: 18px 0 0;
    padding: 0;
    list-style: none;
}

.info-list li {
    padding: 14px 16px;
    border-radius: 16px;
    background: rgba(70,139,223,0.08);
    color: #2b405d;
}

.steps {
    counter-reset: step;
    display: grid;
    gap: 14px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.steps li {
    counter-increment: step;
    position: relative;
    padding: 18px 18px 18px 62px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--white);
}

.steps li:before {
    content: counter(step);
    position: absolute;
    left: 18px;
    top: 18px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
}

.faq-list {
    display: grid;
    gap: 14px;
}

.faq-item {
    padding: 20px;
    border-radius: 20px;
    background: rgba(255,255,255,0.88);
    border: 1px solid var(--line);
}

.faq-item h2,
.faq-item h3 {
    margin: 0 0 8px;
    font-size: 19px;
}

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

.cta-panel {
    display: grid;
    gap: 18px;
    align-items: center;
    padding: 26px;
    border-radius: 28px;
    background:
        radial-gradient(circle at 88% 15%, rgba(70,139,223,0.24), transparent 32%),
        linear-gradient(135deg, rgb(235,246,255), #ffffff);
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
}

.cta-panel h2,
.cta-panel p {
    margin: 0;
}

.cta-panel p {
    color: var(--muted);
}

.site-footer {
    margin-top: 36px;
    padding: 38px 0 24px;
    background: #f1f7ff;
    border-top: 1px solid var(--line);
}

.footer-grid {
    display: grid;
    gap: 22px;
}

.site-footer h3 {
    margin: 0 0 10px;
    color: var(--primary-dark);
    font-size: 16px;
}

.site-footer p,
.footer-bottom {
    color: var(--muted);
    font-size: 14px;
}

.site-footer a {
    display: block;
    color: var(--muted);
    margin: 7px 0;
    font-size: 14px;
}

.site-footer a:hover {
    color: var(--primary-dark);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
}

.download-box {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
}

.download-box .download-btn {
    margin-top: 18px;
}

.notice {
    border-left: 4px solid var(--primary);
}

@media (min-width: 640px) {
    .stats {
        grid-template-columns: repeat(3, 1fr);
    }

    .feature-grid,
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cta-panel {
        grid-template-columns: 1fr auto;
    }
}

@media (min-width: 920px) {
    .container {
        width: min(100% - 56px, 1160px);
    }

    .nav-toggle {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        justify-content: flex-end;
        gap: 4px;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }

    .site-nav a {
        font-size: 14px;
        padding: 8px 10px;
    }

    .hero {
        padding: 76px 0 62px;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
        gap: 54px;
    }

    .section {
        padding: 52px 0;
    }

    .feature-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .card-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .article-layout {
        grid-template-columns: minmax(0, 1fr) 330px;
        align-items: start;
    }

    .article-sidebar {
        position: sticky;
        top: 96px;
    }

    .footer-grid {
        grid-template-columns: 1.5fr repeat(3, 1fr);
    }

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

@media (min-width: 1120px) {
    .site-nav a {
        padding: 9px 13px;
    }
}