:root {
    --primary: rgb(70,139,223);
    --primary-deep: #2769bd;
    --primary-soft: #eef6ff;
    --ink: #15243a;
    --muted: #5f6f86;
    --line: rgba(70, 139, 223, 0.16);
    --card: rgba(255, 255, 255, 0.92);
    --shadow: 0 18px 45px rgba(43, 103, 178, 0.11);
    --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 top left, rgba(70,139,223,0.20), transparent 34rem),
        linear-gradient(180deg, #f4f9ff 0%, #ffffff 38%, #f6fbff 100%);
    line-height: 1.76;
    overflow-x: hidden;
}

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

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.86);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(18px);
}

.header-inner {
    min-height: 72px;
    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;
}

.brand-logo {
    width: 42px;
    height: 42px;
    border-radius: 14px;
}

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

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    display: grid;
    place-content: center;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--ink);
    border-radius: 999px;
    display: block;
}

.site-nav {
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
    display: none;
    flex-direction: column;
}

.site-nav.open {
    display: flex;
}

.site-nav a {
    padding: 12px 14px;
    border-radius: 14px;
    color: var(--muted);
    font-weight: 650;
}

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

.hero,
.page-hero {
    padding: 54px 0 34px;
}

.hero-grid {
    display: grid;
    gap: 34px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255,255,255,0.74);
    color: var(--primary-deep);
    font-weight: 750;
    font-size: 0.88rem;
}

h1,
h2,
h3 {
    line-height: 1.24;
    margin: 0 0 14px;
    letter-spacing: -0.03em;
}

h1 {
    font-size: clamp(2.08rem, 9vw, 4.35rem);
    max-width: 860px;
}

h2 {
    font-size: clamp(1.55rem, 5vw, 2.55rem);
}

h3 {
    font-size: 1.18rem;
}

.lead {
    font-size: 1.05rem;
    color: var(--muted);
    max-width: 760px;
}

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

.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-weight: 800;
    box-shadow: 0 14px 30px rgba(70,139,223,0.28);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-deep);
    box-shadow: 0 18px 38px rgba(70,139,223,0.32);
}

.security-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.security-tags span,
.badge {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,0.10);
    color: var(--primary-deep);
    font-weight: 700;
    font-size: 0.9rem;
}

.product-panel {
    position: relative;
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 32px;
    background: linear-gradient(145deg, rgba(255,255,255,0.88), rgba(235,246,255,0.88));
    box-shadow: var(--shadow);
}

.product-panel::before {
    content: "";
    position: absolute;
    inset: 18px -10px auto auto;
    width: 130px;
    height: 130px;
    border-radius: 40px;
    background: rgba(70,139,223,0.15);
    z-index: -1;
}

.app-image {
    width: min(100%, 420px);
    margin: 0 auto;
    filter: drop-shadow(0 22px 32px rgba(42,91,151,0.18));
}

.metric-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 18px;
}

.metric {
    padding: 14px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}

.metric strong {
    display: block;
    color: var(--primary-deep);
    font-size: 1.35rem;
}

.section {
    padding: 36px 0;
}

.section-head {
    margin-bottom: 22px;
    max-width: 780px;
}

.section-head p,
.card p,
.article-body p,
.faq-item p,
.steps li,
.notice-list li {
    color: var(--muted);
}

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

.card {
    padding: 22px;
    border-radius: var(--radius);
    background: var(--card);
    border: 1px solid var(--line);
    box-shadow: 0 12px 30px rgba(35, 86, 143, 0.07);
}

.card-icon {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: var(--primary-soft);
    color: var(--primary-deep);
    font-weight: 900;
    margin-bottom: 14px;
}

.split {
    display: grid;
    gap: 18px;
}

.info-box,
.notice-box,
.cta-box {
    border-radius: 28px;
    border: 1px solid var(--line);
    background: linear-gradient(145deg, #ffffff, #edf6ff);
    padding: 24px;
    box-shadow: var(--shadow);
}

.cta-box {
    text-align: center;
}

.cta-box p {
    color: var(--muted);
    margin-inline: auto;
    max-width: 720px;
}

.steps,
.notice-list {
    margin: 0;
    padding-left: 20px;
}

.steps li,
.notice-list li {
    margin: 9px 0;
}

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

.faq-item {
    padding: 18px 20px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: 0 10px 24px rgba(35, 86, 143, 0.06);
}

.faq-item h3 {
    font-size: 1rem;
    margin-bottom: 6px;
}

.page-hero .lead {
    max-width: 820px;
}

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

.article-body {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 28px;
    background: #fff;
    box-shadow: var(--shadow);
}

.article-body .download-btn {
    margin-top: 14px;
}

.side-card {
    padding: 22px;
    border-radius: 24px;
    border: 1px solid var(--line);
    background: var(--primary-soft);
}

.side-card ul {
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
}

.table-card {
    overflow-x: auto;
}

.safe-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 560px;
}

.safe-table th,
.safe-table td {
    text-align: left;
    padding: 14px 12px;
    border-bottom: 1px solid var(--line);
}

.safe-table th {
    color: var(--primary-deep);
    background: var(--primary-soft);
}

.site-footer {
    margin-top: 42px;
    padding: 42px 0 24px;
    background: #0f243d;
    color: rgba(255,255,255,0.82);
}

.footer-grid {
    display: grid;
    gap: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    margin-bottom: 10px;
}

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

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

.site-footer a {
    display: block;
    margin: 7px 0;
    color: rgba(255,255,255,0.72);
}

.site-footer a:hover {
    color: #fff;
}

.footer-bottom {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.14);
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.64);
}

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

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

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

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

    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        box-shadow: none;
        border: 0;
        padding: 0;
        background: transparent;
    }

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

    .hero {
        padding: 82px 0 54px;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
    }

    .metric-row {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

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

    .split,
    .article-layout {
        grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.8fr);
    }

    .section {
        padding: 54px 0;
    }

    .article-body,
    .info-box,
    .notice-box,
    .cta-box {
        padding: 34px;
    }

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

@media (min-width: 1180px) {
    .site-nav a {
        padding-inline: 15px;
    }

    .hero-grid {
        gap: 56px;
    }
}