:root {
    --primary: rgb(70,139,223);
    --primary-dark: #236bb9;
    --primary-soft: #e9f3ff;
    --ink: #152033;
    --muted: #637083;
    --line: #dce8f7;
    --panel: #ffffff;
    --panel-soft: #f6faff;
    --bg: #f7fbff;
    --shadow: 0 16px 40px rgba(26, 84, 151, 0.10);
    --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: linear-gradient(180deg, #f3f8ff 0%, #ffffff 42%, #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: 50;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220, 232, 247, 0.9);
}

.nav-wrap {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

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

.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
}

.brand-name {
    font-size: 1.06rem;
}

.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: 99px;
    background: var(--ink);
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 78px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 20px;
    box-shadow: var(--shadow);
}

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

.nav-link {
    padding: 10px 12px;
    color: #42506a;
    border-radius: 12px;
    font-size: 0.96rem;
    transition: background .2s ease, color .2s ease;
}

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

main {
    min-height: 70vh;
}

.section {
    padding: 56px 0;
}

.section-head {
    margin-bottom: 24px;
    max-width: 760px;
}

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

.eyebrow,
.category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border: 1px solid rgba(70, 139, 223, 0.22);
    background: rgba(70, 139, 223, 0.10);
    color: var(--primary-dark);
    border-radius: 999px;
    font-size: 0.84rem;
    font-weight: 700;
}

h1,
h2,
h3 {
    line-height: 1.22;
    margin: 0 0 14px;
    letter-spacing: -0.03em;
}

h1 {
    font-size: clamp(2.1rem, 8vw, 4.8rem);
}

h2 {
    font-size: clamp(1.65rem, 4.5vw, 2.65rem);
}

h3 {
    font-size: 1.18rem;
}

p {
    margin: 0 0 14px;
    color: var(--muted);
}

.hero {
    padding: 52px 0 42px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -180px -80px auto auto;
    width: 380px;
    height: 380px;
    background: radial-gradient(circle, rgba(70,139,223,0.24), rgba(70,139,223,0));
    pointer-events: none;
}

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

.hero-copy {
    position: relative;
    z-index: 2;
}

.hero-copy h1 {
    margin-top: 14px;
}

.hero-copy .lead {
    font-size: 1.06rem;
    max-width: 660px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    margin: 26px 0;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    min-width: 148px;
    padding: 13px 22px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 26px rgba(70,139,223,0.26);
    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 30px rgba(70,139,223,0.30);
}

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

.trust-tags,
.mini-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.trust-tags span,
.mini-tags span {
    padding: 7px 11px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
    color: #42506a;
    font-size: 0.88rem;
}

.hero-visual {
    position: relative;
    min-height: 420px;
    display: grid;
    place-items: center;
}

.phone-card {
    width: min(320px, 84vw);
    border-radius: 34px;
    padding: 16px;
    background: linear-gradient(145deg, #ffffff, #eaf4ff);
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
}

.phone-card img {
    border-radius: 28px;
    width: 100%;
}

.float-card {
    position: absolute;
    padding: 14px 16px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(220, 232, 247, 0.9);
    box-shadow: var(--shadow);
    max-width: 210px;
}

.float-card strong {
    display: block;
    font-size: 0.95rem;
}

.float-card small {
    color: var(--muted);
}

.float-card.status {
    top: 18px;
    left: 0;
}

.float-card.assets {
    bottom: 34px;
    left: 6px;
}

.float-card.risk {
    right: 0;
    bottom: 108px;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    background: var(--primary);
    margin-right: 6px;
    box-shadow: 0 0 0 6px rgba(70,139,223,0.12);
}

.metric-strip {
    display: grid;
    gap: 14px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.78);
    box-shadow: var(--shadow);
}

.metric-item {
    padding: 14px;
    border-radius: 16px;
    background: var(--panel-soft);
}

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

.metric-item span {
    color: var(--muted);
    font-size: 0.92rem;
}

.card-grid,
.category-grid,
.feature-grid,
.scenario-grid,
.recommend-grid,
.faq-grid,
.guide-card-grid {
    display: grid;
    gap: 18px;
}

.card,
.category-card,
.feature-card,
.scenario-card,
.faq-item,
.guide-card,
.notice-card,
.step-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 10px 30px rgba(26, 84, 151, 0.07);
}

.category-card,
.step-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 170px;
}

.category-card:hover,
.step-card:hover,
.feature-card:hover {
    border-color: rgba(70,139,223,0.45);
    transform: translateY(-2px);
    transition: all .2s ease;
}

.card-number,
.step-number {
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: inline-grid;
    place-items: center;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
    box-shadow: 0 10px 22px rgba(70,139,223,0.20);
}

.category-card .arrow,
.step-card .arrow {
    margin-top: auto;
    color: var(--primary-dark);
    font-weight: 800;
}

.feature-card .icon,
.scenario-card .icon,
.guide-card .icon {
    width: 44px;
    height: 44px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
    margin-bottom: 14px;
}

.security-layout,
.split-layout,
.guide-layout,
.download-layout {
    display: grid;
    gap: 24px;
    align-items: start;
}

.security-panel {
    border-radius: 28px;
    padding: 24px;
    background: linear-gradient(145deg, #ffffff, #eef7ff);
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
}

.security-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
}

.security-row:last-child {
    border-bottom: 0;
}

.security-row span {
    color: var(--muted);
}

.security-row strong {
    color: var(--primary-dark);
    white-space: nowrap;
}

.steps {
    display: grid;
    gap: 16px;
    counter-reset: steps;
}

.process-step {
    position: relative;
    padding: 20px 20px 20px 66px;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: #fff;
}

.process-step::before {
    counter-increment: steps;
    content: counter(steps);
    position: absolute;
    left: 18px;
    top: 20px;
    width: 32px;
    height: 32px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}

.cta-section {
    padding: 54px 0 70px;
}

.cta-panel {
    text-align: center;
    border-radius: 30px;
    padding: 34px 22px;
    background: linear-gradient(135deg, #eaf4ff, #ffffff 58%, #f5faff);
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
}

.page-hero {
    padding: 54px 0 28px;
}

.page-hero .inner {
    border-radius: 30px;
    padding: 34px 22px;
    background: linear-gradient(135deg, #eef7ff, #ffffff 62%, #f9fcff);
    border: 1px solid rgba(70,139,223,0.18);
}

.page-hero h1 {
    margin-top: 14px;
    max-width: 860px;
}

.page-hero p {
    max-width: 780px;
    font-size: 1.03rem;
}

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

.article-block h2,
.article-block h3 {
    margin-top: 14px;
}

.check-list,
.clean-list {
    list-style: none;
    padding: 0;
    margin: 12px 0 0;
    display: grid;
    gap: 10px;
}

.check-list li,
.clean-list li {
    position: relative;
    padding-left: 30px;
    color: #42506a;
}

.check-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.68em;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(70,139,223,0.12);
}

.notice-band {
    padding: 18px;
    border-radius: 20px;
    border: 1px solid rgba(70,139,223,0.24);
    background: var(--primary-soft);
}

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

.faq-item h2,
.faq-item h3 {
    font-size: 1.08rem;
}

.download-main-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 28px;
    box-shadow: var(--shadow);
}

.download-side {
    display: grid;
    gap: 16px;
}

.footer-grid {
    display: grid;
    gap: 22px;
    padding: 42px 0 24px;
}

.site-footer {
    background: #10213b;
    color: #dbe8fb;
    margin-top: 28px;
}

.site-footer p,
.site-footer a {
    color: #b9c7dc;
}

.site-footer a {
    display: block;
    padding: 4px 0;
}

.site-footer h2,
.site-footer h3 {
    color: #fff;
}

.footer-logo {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    margin-bottom: 12px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.12);
    padding: 18px 0 26px;
}

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

    .metric-strip,
    .category-grid,
    .feature-grid,
    .scenario-grid,
    .recommend-grid,
    .faq-grid,
    .guide-card-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .page-hero .inner,
    .cta-panel {
        padding: 42px;
    }
}

@media (min-width: 920px) {
    .nav-toggle {
        display: none;
    }

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

    .hero {
        padding: 78px 0 54px;
    }

    .hero-layout {
        grid-template-columns: minmax(0, 1.02fr) minmax(380px, 0.98fr);
        gap: 54px;
    }

    .metric-strip {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

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

    .security-layout,
    .split-layout,
    .guide-layout,
    .download-layout {
        grid-template-columns: minmax(0, 1fr) 380px;
        gap: 34px;
    }

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

    .footer-grid {
        grid-template-columns: 1.4fr 0.8fr 0.8fr 0.8fr;
    }
}

@media (min-width: 1120px) {
    .float-card.status {
        left: -18px;
    }

    .float-card.risk {
        right: -18px;
    }
}