* {
    box-sizing: border-box;
}
:root {
    --brand-blue: #2980FE;
    --brand-blue-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --line: #e5e9f2;
    --white: #ffffff;
    --shadow: 0 18px 45px rgba(23, 43, 77, 0.08);
    --radius-lg: 32px;
    --radius-md: 24px;
    --radius-sm: 18px;
}
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: #f7f9fd;
    line-height: 1.72;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
.container {
    width: min(1120px, calc(100% - 36px));
    margin: 0 auto;
}
.section {
    padding: 64px 0;
}
.section-title {
    margin: 0 0 12px;
    font-size: clamp(28px, 4.2vw, 44px);
    line-height: 1.18;
    letter-spacing: -0.02em;
}
.section-subtitle {
    margin: 0 0 26px;
    color: var(--muted);
    max-width: 760px;
}
.eyebrow,
.category-badge,
.card-tag {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    color: var(--brand-blue);
    background: rgba(41, 128, 254, 0.1);
    font-size: 14px;
    font-weight: 700;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(229, 233, 242, 0.82);
}
.nav-shell {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 20px;
    white-space: nowrap;
}
.brand img {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    object-fit: cover;
}
.nav-toggle {
    display: none;
}
.nav-trigger {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    border: 1px solid var(--line);
    display: grid;
    place-content: center;
    gap: 5px;
    cursor: pointer;
    background: #fff;
}
.nav-trigger span {
    width: 20px;
    height: 2px;
    background: #24324b;
    border-radius: 999px;
}
.main-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 76px;
    display: none;
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .main-nav {
    display: grid;
}
.main-nav a {
    padding: 10px 12px;
    border-radius: 14px;
    color: #3b475d;
    font-weight: 650;
    font-size: 15px;
}
.main-nav a:hover,
.main-nav a.active {
    color: var(--brand-blue);
    background: rgba(41, 128, 254, 0.09);
}
.network-manager-hero {
    padding: 34px 0 56px;
}
.hero-card {
    position: relative;
    overflow: hidden;
    border-radius: 34px;
    background: var(--gradient);
    color: #fff;
    padding: 34px 24px;
    box-shadow: 0 30px 70px rgba(53, 88, 242, 0.22);
}
.hero-card::after {
    content: "";
    position: absolute;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    right: -130px;
    top: -120px;
    background: rgba(255,255,255,0.22);
    filter: blur(6px);
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 30px;
}
.hero-copy h1 {
    margin: 16px 0 18px;
    font-size: clamp(36px, 8vw, 66px);
    line-height: 1.05;
    letter-spacing: -0.045em;
}
.hero-copy p {
    margin: 0 0 24px;
    color: rgba(255,255,255,0.88);
    font-size: 17px;
    max-width: 640px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    border-radius: 999px;
    background: var(--brand-blue);
    color: #fff !important;
    font-weight: 800;
    border: 0;
    box-shadow: 0 12px 28px rgba(41, 128, 254, 0.26);
    transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
}
.download-btn:hover {
    background: var(--brand-blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 18px 36px rgba(23, 104, 232, 0.28);
}
.hero-tags,
.soft-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}
.hero-tags span,
.soft-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.15);
    color: rgba(255,255,255,0.92);
    border: 1px solid rgba(255,255,255,0.16);
    font-size: 14px;
}
.hero-visual {
    position: relative;
    min-height: 320px;
    display: grid;
    place-items: center;
}
.hero-device {
    width: min(430px, 100%);
    padding: 18px;
    border-radius: 30px;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.24);
    backdrop-filter: blur(18px);
}
.float-pill {
    position: absolute;
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(255,255,255,0.92);
    color: #334155;
    font-weight: 800;
    font-size: 14px;
    box-shadow: 0 15px 38px rgba(31, 41, 55, 0.14);
}
.float-pill:nth-of-type(2) { top: 12px; left: 4px; }
.float-pill:nth-of-type(3) { right: 0; top: 76px; }
.float-pill:nth-of-type(4) { left: 18px; bottom: 48px; }
.float-pill:nth-of-type(5) { right: 18px; bottom: 12px; }
.daily-scenes,
.bento-feature-center,
.risk-grid,
.faq-grid,
.card-grid,
.process-steps,
.tip-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}
.scene-card,
.bento-card,
.info-card,
.risk-card,
.faq-item,
.step-card,
.tip-card,
.check-card,
.article-card,
.safety-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 12px 34px rgba(25, 35, 54, 0.05);
}
.scene-card {
    min-height: 185px;
}
.scene-card h3,
.bento-card h3,
.info-card h3,
.risk-card h3,
.step-card h3,
.tip-card h3,
.check-card h3 {
    margin: 12px 0 8px;
    font-size: 21px;
}
.scene-card p,
.bento-card p,
.info-card p,
.risk-card p,
.step-card p,
.tip-card p,
.check-card p,
.article-card p,
.safety-panel p {
    color: var(--muted);
    margin: 0 0 12px;
}
.text-link {
    color: var(--brand-blue);
    font-weight: 800;
}
.bento-feature-center .bento-card {
    min-height: 210px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.bento-card.large {
    background: linear-gradient(135deg, #ffffff 0%, #eef5ff 100%);
}
.feature-split,
.safe-browsing-section,
.smart-route-section,
.multi-device-section,
.network-diagnosis-section,
.account-security-section,
.article-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    align-items: center;
}
.feature-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 26px;
    box-shadow: var(--shadow);
}
.feature-panel h2,
.public-wifi-section h2,
.privacy-guard-section h2,
.cta-section h2 {
    margin: 12px 0 14px;
    font-size: clamp(28px, 4.5vw, 46px);
    line-height: 1.15;
}
.feature-panel p,
.public-wifi-section p,
.privacy-guard-section p,
.cta-section p,
.article-hero p {
    color: var(--muted);
}
.feature-list,
.check-list,
.clean-list {
    list-style: none;
    padding: 0;
    margin: 18px 0 0;
    display: grid;
    gap: 10px;
}
.feature-list li,
.check-list li,
.clean-list li {
    padding: 12px 14px;
    border-radius: 16px;
    background: #f6f9ff;
    color: #344054;
    border: 1px solid #e7eefc;
}
.image-card {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #eef5ff 0%, #ffffff 100%);
    border: 1px solid var(--line);
    padding: 22px;
    min-height: 280px;
    display: grid;
    place-items: center;
}
.image-card.gradient-background {
    background: var(--gradient);
}
.image-card img {
    border-radius: 26px;
    filter: drop-shadow(0 18px 30px rgba(31, 41, 55, 0.12));
}
.public-wifi-section,
.privacy-guard-section,
.cta-section {
    border-radius: var(--radius-lg);
    padding: 30px 22px;
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow);
}
.public-wifi-section .wifi-layout {
    display: grid;
    gap: 20px;
}
.privacy-guard-section {
    background: linear-gradient(135deg, #ffffff 0%, #f5f8ff 100%);
}
.privacy-cards,
.wifi-cards {
    display: grid;
    gap: 16px;
    grid-template-columns: 1fr;
}
.wifi-cards .info-card,
.privacy-cards .info-card {
    box-shadow: none;
}
.process-steps {
    counter-reset: step;
}
.step-card {
    position: relative;
    padding-top: 28px;
}
.step-number {
    display: inline-grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 14px;
    background: var(--brand-blue);
    color: #fff;
    font-weight: 900;
}
.risk-card {
    border-left: 4px solid var(--brand-blue);
}
.faq-item h3 {
    margin: 0 0 8px;
    font-size: 18px;
}
.faq-item p {
    margin: 0;
    color: var(--muted);
}
.cta-section {
    text-align: center;
    color: #fff;
    background: var(--gradient);
    border: 0;
    overflow: hidden;
}
.cta-section p {
    color: rgba(255,255,255,0.86);
    margin-left: auto;
    margin-right: auto;
    max-width: 680px;
}
.cta-section .download-btn {
    margin-top: 10px;
    background: var(--brand-blue);
}
.page-hero,
.article-hero {
    padding: 46px 0 24px;
}
.article-hero .hero-inner,
.page-hero .hero-inner {
    border-radius: var(--radius-lg);
    padding: 30px 24px;
    background: linear-gradient(135deg, #ffffff 0%, #eef5ff 100%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.article-hero h1,
.page-hero h1 {
    margin: 14px 0 12px;
    font-size: clamp(32px, 6vw, 58px);
    line-height: 1.12;
    letter-spacing: -0.03em;
}
.article-main {
    padding: 28px 0 70px;
}
.article-content {
    display: grid;
    gap: 18px;
}
.article-card h2,
.safety-panel h2 {
    margin: 0 0 10px;
    font-size: 25px;
}
.article-card ul,
.safety-panel ul,
.article-card ol,
.safety-panel ol {
    padding-left: 20px;
    color: #4b5563;
}
.article-card li,
.safety-panel li {
    margin: 8px 0;
}
.aside-stack {
    display: grid;
    gap: 16px;
}
.aside-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 20px;
}
.aside-card h3 {
    margin: 0 0 10px;
}
.aside-card a {
    display: block;
    padding: 9px 0;
    color: var(--brand-blue);
    font-weight: 760;
}
.download-area {
    margin-top: 18px;
}
.download-page-card {
    max-width: 840px;
    margin: 0 auto;
    text-align: center;
}
.download-page-card .download-btn {
    margin: 12px 0 22px;
}
.site-footer {
    background: #101827;
    color: #d7deea;
    padding: 46px 0 22px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 26px;
}
.footer-brand {
    font-size: 24px;
    font-weight: 900;
    color: #fff;
    margin-bottom: 8px;
}
.site-footer p {
    color: #aeb8ca;
    margin: 0;
}
.site-footer h3 {
    color: #fff;
    margin: 0 0 12px;
    font-size: 16px;
}
.site-footer a {
    display: block;
    color: #aeb8ca;
    padding: 6px 0;
}
.site-footer a:hover {
    color: #fff;
}
.footer-bottom {
    margin-top: 32px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #9aa6ba;
    font-size: 14px;
}
@media (min-width: 720px) {
    .daily-scenes,
    .card-grid,
    .risk-grid,
    .faq-grid,
    .tip-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .privacy-cards,
    .wifi-cards {
        grid-template-columns: repeat(3, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 980px) {
    .nav-trigger { display: none; }
    .main-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .main-nav a {
        font-size: 14px;
        padding: 9px 10px;
    }
    .hero-card {
        padding: 58px 58px 46px;
        border-radius: 42px;
    }
    .hero-grid {
        grid-template-columns: 1.05fr .95fr;
        align-items: center;
    }
    .daily-scenes {
        grid-template-columns: repeat(3, 1fr);
    }
    .bento-feature-center {
        grid-template-columns: repeat(6, 1fr);
        grid-auto-rows: minmax(210px, auto);
    }
    .bento-card { grid-column: span 2; }
    .bento-card.large { grid-column: span 3; }
    .bento-card.tall { grid-row: span 2; }
    .safe-browsing-section,
    .smart-route-section,
    .multi-device-section,
    .network-diagnosis-section,
    .account-security-section,
    .feature-split {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .public-wifi-section,
    .privacy-guard-section {
        padding: 44px;
    }
    .public-wifi-section .wifi-layout {
        grid-template-columns: 1.05fr .95fr;
        align-items: center;
    }
    .process-steps {
        grid-template-columns: repeat(3, 1fr);
    }
    .risk-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .article-layout {
        grid-template-columns: minmax(0, 1fr) 330px;
        align-items: start;
    }
    .footer-grid {
        grid-template-columns: 1.4fr repeat(3, 1fr);
    }
}
@media (min-width: 1180px) {
    .main-nav a { padding: 9px 12px; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 26px, 1120px); }
    .hero-card { padding: 28px 18px; border-radius: 28px; }
    .float-pill { position: static; margin: 7px; display: inline-flex; }
    .hero-visual { min-height: auto; display: block; }
    .hero-device { margin-top: 18px; }
    .public-wifi-section,
    .privacy-guard-section,
    .cta-section { padding: 24px 16px; }
    .download-btn { width: 100%; }
}