* {
    box-sizing: border-box;
}

:root {
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #202637;
    --muted: #6B7280;
    --line: #E5EAF3;
    --soft: #F6F8FC;
    --soft-blue: #F1F6FF;
    --white: #FFFFFF;
    --radius-xl: 32px;
    --radius-lg: 24px;
    --shadow: 0 18px 45px rgba(33, 52, 92, .08);
}

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: #FFFFFF;
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, .92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(229, 234, 243, .85);
}

.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: .02em;
    color: #15213A;
}

.brand-logo {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 8px 20px rgba(41,128,254,.18);
}

.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: var(--white);
    box-shadow: var(--shadow);
}

.site-nav.open {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.site-nav a {
    padding: 10px 12px;
    border-radius: 14px;
    color: #3D465C;
    font-size: 14px;
}

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

.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--white);
    color: #1F2937;
    font-size: 20px;
}

section {
    padding: 58px 0;
}

.section-head {
    max-width: 760px;
    margin-bottom: 26px;
}

.section-kicker,
.category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    padding: 6px 12px;
    border-radius: 999px;
    color: var(--blue);
    background: var(--soft-blue);
    font-weight: 700;
    font-size: 13px;
}

h1, h2, h3 {
    margin: 0;
    line-height: 1.22;
    color: #142033;
}

h1 {
    font-size: clamp(34px, 7vw, 64px);
    letter-spacing: -.045em;
}

h2 {
    font-size: clamp(28px, 4vw, 42px);
    letter-spacing: -.03em;
}

h3 {
    font-size: 20px;
}

p {
    margin: 12px 0 0;
    color: var(--muted);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 12px 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #FFFFFF;
    font-weight: 800;
    box-shadow: 0 12px 26px rgba(41,128,254,.24);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(23,104,232,.26);
}

.link-arrow {
    display: inline-flex;
    margin-top: 18px;
    color: var(--blue);
    font-weight: 800;
}

.link-arrow::after {
    content: "→";
    margin-left: 6px;
}

.network-manager-hero {
    padding: 34px 0 64px;
    background:
        radial-gradient(circle at top left, rgba(53,88,242,.08), transparent 36%),
        radial-gradient(circle at 80% 12%, rgba(184,77,218,.08), transparent 32%);
}

.hero-shell {
    position: relative;
    overflow: hidden;
    display: grid;
    gap: 30px;
    padding: 34px;
    border-radius: 34px;
    color: #FFFFFF;
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    box-shadow: 0 28px 70px rgba(65, 80, 190, .24);
}

.hero-shell::before {
    content: "";
    position: absolute;
    width: 360px;
    height: 360px;
    right: -90px;
    top: -120px;
    border-radius: 50%;
    background: rgba(255,255,255,.18);
}

.hero-copy,
.hero-visual {
    position: relative;
    z-index: 1;
}

.hero-copy h1,
.hero-copy p {
    color: #FFFFFF;
}

.hero-copy p {
    max-width: 600px;
    opacity: .9;
    font-size: 17px;
}

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

.hero-tags,
.float-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 22px;
}

.hero-tags span,
.float-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    color: #FFFFFF;
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    display: grid;
    gap: 16px;
    align-content: center;
}

.product-card {
    padding: 18px;
    border-radius: 28px;
    background: rgba(255,255,255,.86);
    box-shadow: 0 20px 50px rgba(16, 24, 40, .18);
}

.product-card img {
    width: 100%;
    max-height: 360px;
    object-fit: contain;
}

.status-card {
    display: grid;
    gap: 6px;
    padding: 16px;
    border-radius: 22px;
    background: rgba(255,255,255,.92);
    color: #1D2B48;
    box-shadow: 0 16px 40px rgba(20,32,51,.14);
}

.status-card small {
    color: #667085;
}

.status-line {
    height: 8px;
    border-radius: 999px;
    background: linear-gradient(90deg, #2980FE, #7B4EF1);
}

.daily-scenes,
.bento-feature-center,
.safe-browsing-section,
.privacy-guard-section,
.network-diagnosis-section,
.risk-grid {
    background: var(--white);
}

.scene-grid {
    display: grid;
    gap: 16px;
}

.scene-card,
.bento-card,
.info-card,
.step-card,
.risk-card,
.faq-item,
.check-card,
.tip-card {
    border: 1px solid var(--line);
    border-radius: 24px;
    background: var(--white);
    box-shadow: 0 14px 36px rgba(33,52,92,.06);
}

.scene-card {
    padding: 22px;
}

.scene-card .tag,
.bento-card .tag {
    display: inline-flex;
    margin-bottom: 12px;
    padding: 5px 10px;
    border-radius: 999px;
    color: var(--blue);
    background: var(--soft-blue);
    font-weight: 800;
    font-size: 12px;
}

.bento-grid {
    display: grid;
    gap: 16px;
}

.bento-card {
    padding: 24px;
    min-height: 190px;
}

.bento-card.featured {
    background: linear-gradient(180deg, #FFFFFF 0%, #F3F7FF 100%);
}

.split-section {
    display: grid;
    gap: 24px;
    align-items: center;
}

.feature-panel {
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    background: var(--white);
    box-shadow: var(--shadow);
}

.feature-panel.soft {
    background: #F7FAFF;
}

.feature-media {
    padding: 18px;
    border-radius: var(--radius-xl);
    background: linear-gradient(180deg, #F8FBFF 0%, #EDF3FF 100%);
    border: 1px solid var(--line);
}

.feature-media img {
    margin: 0 auto;
    max-height: 360px;
    object-fit: contain;
}

.bullet-list,
.check-list {
    display: grid;
    gap: 10px;
    padding: 0;
    margin: 20px 0 0;
    list-style: none;
}

.bullet-list li,
.check-list li {
    display: flex;
    gap: 10px;
    color: #3D465C;
}

.bullet-list li::before,
.check-list li::before {
    content: "";
    width: 9px;
    height: 9px;
    flex: 0 0 auto;
    margin-top: 10px;
    border-radius: 50%;
    background: var(--blue);
}

.smart-route-section,
.multi-device-section,
.account-security-section,
.page-hero,
.download-page {
    background: var(--soft);
}

.public-wifi-section {
    background: #F9FBFF;
}

.wifi-panel {
    display: grid;
    gap: 18px;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    background: var(--white);
    box-shadow: var(--shadow);
}

.info-grid,
.privacy-grid,
.risk-grid-inner,
.faq-grid,
.related-grid,
.guide-grid,
.download-steps {
    display: grid;
    gap: 16px;
}

.info-card,
.step-card,
.risk-card,
.check-card,
.tip-card {
    padding: 22px;
}

.process-steps {
    background: #F8FAFE;
}

.step-number {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    border-radius: 14px;
    color: #FFFFFF;
    background: var(--blue);
    font-weight: 800;
}

.risk-card {
    border-left: 4px solid var(--blue);
}

.faq-item {
    padding: 22px;
}

.faq-item h3 {
    font-size: 18px;
}

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

.cta-box {
    text-align: center;
    color: #FFFFFF;
    padding: 34px;
    border-radius: var(--radius-xl);
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    box-shadow: 0 24px 60px rgba(53, 88, 242, .18);
}

.cta-box h2,
.cta-box p {
    color: #FFFFFF;
}

.cta-box .download-btn {
    margin-top: 22px;
}

.page-hero {
    padding: 48px 0 36px;
}

.page-hero-card {
    padding: 30px;
    border-radius: var(--radius-xl);
    background: #FFFFFF;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.page-layout {
    display: grid;
    gap: 24px;
    padding: 46px 0 64px;
}

.article-card {
    padding: 26px;
    border-radius: var(--radius-xl);
    background: #FFFFFF;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.article-card + .article-card {
    margin-top: 18px;
}

.side-panel {
    display: grid;
    gap: 16px;
    align-content: start;
}

.side-panel .tip-card {
    background: #F8FBFF;
}

.download-wrap {
    display: grid;
    gap: 22px;
    padding: 34px;
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    background: #FFFFFF;
    box-shadow: var(--shadow);
}

.download-steps .step-card {
    background: #F8FBFF;
}

.site-footer {
    padding: 42px 0 24px;
    color: #D7DFEF;
    background: #172033;
}

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

.footer-brand {
    color: #FFFFFF;
    font-size: 22px;
    font-weight: 900;
}

.site-footer h3 {
    color: #FFFFFF;
    font-size: 16px;
    margin-bottom: 10px;
}

.site-footer p {
    color: #B8C2D6;
}

.site-footer a {
    display: block;
    color: #B8C2D6;
    margin: 7px 0;
    font-size: 14px;
}

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

.footer-bottom {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.12);
    color: #AAB5CC;
    font-size: 13px;
}

@media (min-width: 700px) {
    .container {
        width: min(1120px, calc(100% - 48px));
    }

    .scene-grid,
    .info-grid,
    .privacy-grid,
    .download-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .risk-grid-inner,
    .faq-grid,
    .related-grid,
    .guide-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

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

@media (min-width: 960px) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }

    .site-nav a {
        font-size: 14px;
        white-space: nowrap;
    }

    .hero-shell {
        grid-template-columns: 1.06fr .94fr;
        padding: 54px;
        min-height: 560px;
    }

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

    .bento-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        grid-auto-rows: minmax(190px, auto);
    }

    .bento-card.featured {
        grid-column: span 2;
    }

    .bento-card.tall {
        grid-row: span 2;
    }

    .split-section {
        grid-template-columns: 1fr 1fr;
    }

    .wifi-panel {
        grid-template-columns: 1.1fr .9fr;
        align-items: center;
        padding: 34px;
    }

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

    .process-grid {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 16px;
    }

    .page-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
        align-items: start;
    }

    .guide-grid.three,
    .info-grid.three,
    .privacy-grid.three {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .download-wrap {
        grid-template-columns: 1fr .8fr;
        align-items: center;
    }
}

@media (max-width: 520px) {
    .hero-shell,
    .page-hero-card,
    .feature-panel,
    .wifi-panel,
    .article-card,
    .download-wrap,
    .cta-box {
        border-radius: 24px;
        padding: 24px;
    }

    .site-nav.open {
        grid-template-columns: 1fr;
    }

    .download-btn {
        width: 100%;
    }

    section {
        padding: 44px 0;
    }
}