:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(31,87,159);
    --primary-soft: rgba(70,139,223,0.12);
    --primary-light: rgba(70,139,223,0.08);
    --text: #142033;
    --muted: #617188;
    --surface: #ffffff;
    --surface-blue: #f2f8ff;
    --line: rgba(31,87,159,0.12);
    --shadow: 0 18px 48px rgba(24,75,132,0.10);
    --radius: 22px;
    --radius-sm: 16px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-width: 320px;
    overflow-x: hidden;
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.75;
    background:
        radial-gradient(circle at 10% 0%, rgba(70,139,223,0.14), transparent 28rem),
        radial-gradient(circle at 90% 8%, rgba(70,139,223,0.10), transparent 26rem),
        linear-gradient(180deg, #f4f9ff 0%, #ffffff 42%, #f7fbff 100%);
}

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

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

p {
    margin: 0 0 1rem;
    color: var(--muted);
}

h1, h2, h3 {
    margin: 0;
    line-height: 1.25;
    color: var(--text);
}

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}

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

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    object-fit: contain;
}

.brand-text {
    font-size: 1.05rem;
}

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
}

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

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    display: none;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255,255,255,0.96);
    box-shadow: var(--shadow);
}

.site-nav.open {
    display: grid;
    gap: 4px;
}

.site-nav a {
    padding: 11px 12px;
    border-radius: 12px;
    color: #42536a;
    font-size: 0.96rem;
}

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

.hero {
    padding: 46px 0 30px;
}

.hero-grid {
    display: grid;
    gap: 28px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    margin-bottom: 18px;
    border: 1px solid rgba(70,139,223,0.18);
    border-radius: 999px;
    color: var(--primary-dark);
    background: rgba(255,255,255,0.72);
    font-weight: 700;
    font-size: 0.82rem;
}

.hero h1,
.page-hero h1 {
    font-size: clamp(2rem, 8vw, 4.8rem);
    letter-spacing: -0.05em;
    margin-bottom: 18px;
}

.hero h1 span,
.page-hero h1 span {
    color: var(--primary);
}

.hero-lead,
.page-lead {
    max-width: 680px;
    font-size: 1.06rem;
    color: #53657c;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 24px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    border: 1px solid rgba(70,139,223,0.22);
    color: #fff;
    background: linear-gradient(135deg, var(--primary), rgb(45,112,196));
    font-weight: 800;
    font-size: 1rem;
    box-shadow: 0 14px 28px rgba(70,139,223,0.24);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(70,139,223,0.30);
}

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

.badge {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 7px 12px;
    border-radius: 999px;
    color: #25415f;
    background: #fff;
    border: 1px solid var(--line);
    font-size: 0.86rem;
    box-shadow: 0 8px 20px rgba(24,75,132,0.06);
}

.device-card {
    position: relative;
    overflow: hidden;
    padding: 18px;
    border-radius: 28px;
    background: linear-gradient(145deg, rgba(255,255,255,0.88), rgba(232,244,255,0.9));
    border: 1px solid rgba(70,139,223,0.16);
    box-shadow: var(--shadow);
}

.device-card::before {
    content: "";
    position: absolute;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    right: -80px;
    top: -60px;
    background: rgba(70,139,223,0.14);
}

.app-preview {
    position: relative;
    width: min(82%, 360px);
    margin: 0 auto;
    filter: drop-shadow(0 22px 40px rgba(39,83,140,0.18));
}

.metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 18px;
}

.metric {
    padding: 12px;
    border-radius: 16px;
    background: rgba(255,255,255,0.78);
    border: 1px solid rgba(70,139,223,0.12);
}

.metric strong {
    display: block;
    color: var(--primary-dark);
    font-size: 1rem;
}

.metric span {
    color: var(--muted);
    font-size: 0.78rem;
}

.section {
    padding: 34px 0;
}

.section-head {
    max-width: 720px;
    margin-bottom: 22px;
}

.section-head.center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.section h2 {
    font-size: clamp(1.55rem, 4vw, 2.5rem);
    letter-spacing: -0.03em;
    margin-bottom: 10px;
}

.card,
.info-panel,
.faq-item,
.step-card {
    border: 1px solid rgba(70,139,223,0.13);
    border-radius: var(--radius);
    background: rgba(255,255,255,0.86);
    box-shadow: 0 12px 34px rgba(24,75,132,0.07);
}

.card {
    padding: 22px;
}

.card h3,
.step-card h3,
.info-panel h3 {
    margin-bottom: 8px;
    font-size: 1.12rem;
}

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

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

.feature-grid.three,
.card-grid.three {
    grid-template-columns: 1fr;
}

.info-panel {
    padding: 24px;
    background: linear-gradient(145deg, #ffffff, #f2f8ff);
}

.split {
    display: grid;
    gap: 18px;
    align-items: start;
}

.check-list {
    display: grid;
    gap: 12px;
    padding: 0;
    margin: 16px 0 0;
    list-style: none;
}

.check-list li {
    position: relative;
    padding-left: 30px;
    color: #52657d;
}

.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(70,139,223,0.12);
}

.page-hero {
    padding: 42px 0 18px;
}

.page-card {
    padding: 24px;
    border-radius: 28px;
    background: rgba(255,255,255,0.72);
    border: 1px solid rgba(70,139,223,0.12);
    box-shadow: var(--shadow);
}

.article {
    max-width: 900px;
}

.article p {
    font-size: 1rem;
}

.tip-box {
    padding: 18px;
    margin: 20px 0;
    border-radius: 18px;
    color: #2e4e70;
    background: var(--primary-light);
    border: 1px solid rgba(70,139,223,0.16);
}

.tip-box strong {
    color: var(--primary-dark);
}

.steps {
    display: grid;
    gap: 14px;
    counter-reset: step;
}

.step-card {
    position: relative;
    padding: 20px 20px 20px 68px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 20px;
    top: 20px;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
}

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

.faq-item {
    padding: 20px;
}

.faq-item h2,
.faq-item h3 {
    margin-bottom: 8px;
    font-size: 1.08rem;
}

.cta-panel {
    padding: 26px;
    border-radius: 28px;
    color: #fff;
    background: linear-gradient(135deg, rgb(70,139,223), rgb(38,97,176));
    box-shadow: 0 18px 40px rgba(70,139,223,0.23);
}

.cta-panel h2,
.cta-panel p {
    color: #fff;
}

.cta-panel .download-btn {
    margin-top: 12px;
    background: #fff;
    color: var(--primary-dark);
    box-shadow: none;
}

.site-footer {
    margin-top: 38px;
    padding: 34px 0 22px;
    background: #0f2540;
    color: rgba(255,255,255,0.84);
}

.site-footer p,
.site-footer a,
.site-footer span {
    color: rgba(255,255,255,0.72);
}

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

.footer-brand {
    font-size: 1.2rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: #fff;
}

.site-footer h3 {
    margin-bottom: 10px;
    color: #fff;
    font-size: 1rem;
}

.site-footer a {
    display: block;
    margin-bottom: 8px;
    font-size: 0.94rem;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding-top: 22px;
    margin-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 0.88rem;
}

@media (min-width: 640px) {
    .container {
        width: min(100% - 48px, 1160px);
    }

    .feature-grid.two,
    .card-grid.two {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
    }
}

@media (min-width: 900px) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 3px;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }

    .site-nav a {
        padding: 9px 12px;
    }

    .hero {
        padding: 82px 0 58px;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.9fr);
        gap: 50px;
    }

    .section {
        padding: 52px 0;
    }

    .feature-grid.three,
    .card-grid.three {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .split {
        grid-template-columns: minmax(0, 1fr) minmax(320px, 0.75fr);
        gap: 28px;
    }

    .page-hero {
        padding: 66px 0 28px;
    }

    .page-card {
        padding: 38px;
    }

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

@media (min-width: 1180px) {
    .hero h1 {
        font-size: 4.7rem;
    }
}