* {
    box-sizing: border-box;
}
:root {
    --primary: rgb(70,139,223);
    --primary-dark: #2468b7;
    --primary-soft: #eaf4ff;
    --text: #18304f;
    --muted: #607086;
    --line: rgba(70,139,223,.18);
    --white: #ffffff;
    --shadow: 0 18px 45px rgba(38, 91, 153, .10);
    --radius: 22px;
}
html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    line-height: 1.75;
    background: linear-gradient(180deg, #f4f9ff 0%, #ffffff 42%, #f7fbff 100%);
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    display: block;
}
.container {
    width: min(100% - 36px, 1160px);
    margin: 0 auto;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(70,139,223,.12);
}
.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #14365f;
    letter-spacing: .2px;
}
.logo-img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
}
.brand-text {
    font-size: 18px;
}
.nav-check {
    display: none;
}
.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    background: #fff;
}
.nav-toggle span {
    width: 18px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}
.site-nav {
    position: absolute;
    left: 18px;
    right: 18px;
    top: 74px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255,255,255,.98);
    box-shadow: var(--shadow);
}
.nav-check:checked ~ .site-nav {
    display: flex;
}
.site-nav a {
    padding: 11px 13px;
    border-radius: 12px;
    color: #38516e;
    font-size: 15px;
}
.site-nav a.active,
.site-nav a:hover {
    background: var(--primary-soft);
    color: var(--primary-dark);
}
.hero {
    position: relative;
    padding: 54px 0 34px;
    overflow: hidden;
}
.hero::before,
.soft-bg::before {
    content: "";
    position: absolute;
    width: 420px;
    height: 420px;
    border-radius: 999px;
    background: radial-gradient(circle, rgba(70,139,223,.23), rgba(70,139,223,0) 68%);
    right: -140px;
    top: 10px;
    pointer-events: none;
}
.hero-grid {
    position: relative;
    display: grid;
    gap: 34px;
    align-items: center;
}
.kicker,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border: 1px solid rgba(70,139,223,.22);
    background: rgba(255,255,255,.78);
    color: var(--primary-dark);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}
h1 {
    margin: 18px 0 16px;
    font-size: clamp(32px, 7vw, 58px);
    line-height: 1.12;
    letter-spacing: -1.2px;
    color: #102b4d;
}
h2 {
    margin: 0 0 14px;
    font-size: clamp(24px, 4vw, 36px);
    line-height: 1.25;
    color: #153557;
}
h3 {
    margin: 0 0 10px;
    font-size: 19px;
    color: #153557;
}
p {
    margin: 0 0 14px;
    color: var(--muted);
}
.lead {
    font-size: 17px;
    color: #4f6278;
    max-width: 690px;
}
.hero-actions,
.section-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: 0 26px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    font-size: 16px;
    box-shadow: 0 14px 28px rgba(70,139,223,.24);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 18px 34px rgba(70,139,223,.28);
}
.ghost-link {
    display: inline-flex;
    align-items: center;
    min-height: 46px;
    color: var(--primary-dark);
    font-weight: 700;
}
.hero-visual {
    position: relative;
    padding: 18px;
    border-radius: 30px;
    background: linear-gradient(145deg, rgba(255,255,255,.92), rgba(232,244,255,.88));
    box-shadow: var(--shadow);
    border: 1px solid rgba(70,139,223,.15);
}
.hero-visual .app-img {
    width: min(100%, 420px);
    margin: 0 auto;
    border-radius: 28px;
}
.security-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}
.security-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: #fff;
    color: #2d609c;
    border: 1px solid var(--line);
    font-size: 13px;
    font-weight: 700;
}
.section {
    padding: 44px 0;
}
.section-head {
    margin-bottom: 24px;
    max-width: 780px;
}
.card,
.info-card,
.faq-item,
.article-card,
.download-panel {
    background: rgba(255,255,255,.92);
    border: 1px solid rgba(70,139,223,.13);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
}
.card-soft {
    background: linear-gradient(145deg, #ffffff, #edf6ff);
}
.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.card-icon {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 12px;
}
.split {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
    align-items: start;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}
.stat {
    padding: 18px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}
.stat strong {
    display: block;
    color: var(--primary-dark);
    font-size: 22px;
}
.stat span {
    display: block;
    color: var(--muted);
    font-size: 13px;
}
.faq-list {
    display: grid;
    gap: 14px;
}
.faq-item h3 {
    font-size: 18px;
}
.page-hero {
    position: relative;
    padding: 48px 0 28px;
}
.page-hero .container {
    position: relative;
}
.article-layout {
    display: grid;
    gap: 18px;
}
.article-body {
    display: grid;
    gap: 18px;
}
.note-list,
.steps {
    padding-left: 20px;
    color: var(--muted);
    margin: 12px 0 0;
}
.note-list li,
.steps li {
    margin: 9px 0;
}
.alert-box {
    padding: 18px;
    border-radius: 20px;
    background: #f0f7ff;
    border: 1px solid rgba(70,139,223,.20);
    color: #3b5876;
}
.download-panel {
    text-align: center;
    background: linear-gradient(135deg, #ffffff, #eaf4ff);
}
.download-panel .download-btn {
    margin-top: 10px;
}
.site-footer {
    margin-top: 42px;
    padding: 38px 0 22px;
    background: #102b4d;
    color: #dfeeff;
}
.footer-grid {
    display: grid;
    gap: 22px;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
.footer-logo {
    width: 34px;
    height: 34px;
    border-radius: 10px;
}
.site-footer p,
.site-footer a {
    color: #b9cce0;
}
.site-footer a {
    display: block;
    margin: 8px 0;
}
.site-footer h3 {
    color: #fff;
    font-size: 16px;
}
.footer-bottom {
    margin-top: 26px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.12);
    color: #9eb5cc;
    font-size: 13px;
}
@media (min-width: 720px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .split,
    .article-layout {
        grid-template-columns: 1.2fr .8fr;
    }
    .footer-grid {
        grid-template-columns: 1.5fr .8fr .8fr;
    }
    .page-hero {
        padding-top: 66px;
    }
}
@media (min-width: 980px) {
    .container {
        width: min(100% - 56px, 1160px);
    }
    .nav-toggle {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        gap: 4px;
    }
    .site-nav a {
        padding: 9px 12px;
        font-size: 14px;
    }
    .hero {
        padding: 78px 0 60px;
    }
    .hero-grid {
        grid-template-columns: 1.08fr .92fr;
        gap: 60px;
    }
    .feature-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }
    .section {
        padding: 60px 0;
    }
    .article-body {
        gap: 22px;
    }
    .card,
    .info-card,
    .faq-item,
    .article-card,
    .download-panel {
        padding: 28px;
    }
}
@media (max-width: 420px) {
    .container {
        width: min(100% - 28px, 1160px);
    }
    .hero-actions,
    .section-actions {
        align-items: stretch;
        flex-direction: column;
    }
    .download-btn,
    .ghost-link {
        width: 100%;
        justify-content: center;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
}