* {
    box-sizing: border-box;
}
:root {
    --brand-blue: #2980FE;
    --brand-blue-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #202A3A;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E6EAF2;
    --card: #FFFFFF;
    --soft-blue: #EEF5FF;
}
html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #FFFFFF;
    line-height: 1.75;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
a {
    color: inherit;
    text-decoration: none;
}
.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
}
.header-inner {
    min-height: 68px;
    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;
}
.logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}
.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--text);
    border-radius: 12px;
    font-size: 20px;
    width: 44px;
    height: 40px;
}
.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 68px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 20px 50px rgba(33, 43, 74, .12);
}
.site-nav.open {
    display: grid;
    gap: 6px;
}
.site-nav a {
    padding: 10px 12px;
    color: #344054;
    border-radius: 12px;
    font-size: 14px;
}
.site-nav a.active,
.site-nav a:hover {
    background: var(--soft-blue);
    color: var(--brand-blue);
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 12px 24px;
    border-radius: 999px;
    background: var(--brand-blue);
    color: #fff;
    font-weight: 700;
    box-shadow: 0 12px 24px rgba(41,128,254,.22);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover {
    background: var(--brand-blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 18px 32px rgba(41,128,254,.26);
}
.section {
    padding: 72px 0;
}
.section-title {
    font-size: clamp(28px, 4vw, 44px);
    line-height: 1.18;
    margin: 0 0 16px;
}
.section-lead {
    color: var(--muted);
    max-width: 760px;
    margin: 0 0 28px;
}
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    color: var(--brand-blue);
    background: var(--soft-blue);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 16px;
}
.gradient-background,
.vpn-network-hero {
    background: var(--gradient);
    color: #fff;
}
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    padding: 70px 0 84px;
}
.vpn-network-hero::before,
.vpn-network-hero::after {
    content: "";
    position: absolute;
    inset: auto;
    border-radius: 999px;
    background: rgba(255,255,255,.18);
    filter: blur(10px);
}
.vpn-network-hero::before {
    width: 360px;
    height: 360px;
    right: -140px;
    top: -120px;
}
.vpn-network-hero::after {
    width: 280px;
    height: 280px;
    left: -120px;
    bottom: -120px;
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 36px;
    align-items: center;
}
.hero-copy h1 {
    font-size: clamp(38px, 9vw, 68px);
    line-height: 1.08;
    margin: 0 0 18px;
    letter-spacing: -.03em;
}
.hero-copy p {
    color: rgba(255,255,255,.88);
    font-size: 17px;
    margin: 0 0 26px;
}
.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}
.hero-tags span,
.status-tag {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.14);
    border: 1px solid rgba(255,255,255,.25);
    color: #fff;
    font-size: 13px;
}
.hero-visual {
    position: relative;
    min-height: 320px;
}
.network-card {
    position: relative;
    padding: 22px;
    border-radius: 32px;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
    box-shadow: 0 28px 80px rgba(20, 24, 80, .18);
}
.network-card::before {
    content: "";
    position: absolute;
    inset: 24px;
    border: 1px dashed rgba(255,255,255,.35);
    border-radius: 28px;
    pointer-events: none;
}
.network-card img {
    position: relative;
    z-index: 1;
    width: min(460px, 100%);
    margin: 0 auto;
    border-radius: 26px;
}
.float-tags {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 16px;
}
.node-overview {
    margin-top: -46px;
    position: relative;
    z-index: 3;
}
.node-grid {
    display: grid;
    gap: 16px;
}
.node-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    box-shadow: 0 16px 40px rgba(33, 43, 74, .08);
}
.node-card .mark {
    display: inline-flex;
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--brand-blue);
    font-size: 12px;
    font-weight: 700;
}
.node-card h3 {
    margin: 12px 0 8px;
    font-size: 20px;
}
.node-card p {
    margin: 0 0 12px;
    color: var(--muted);
}
.text-link {
    color: var(--brand-blue);
    font-weight: 700;
}
.vpn-connection-section,
.global-nodes-section,
.high-speed-section,
.privacy-protection-section,
.no-log-policy-section,
.multi-device-section,
.encryption-protocol-section {
    overflow: hidden;
}
.split-grid {
    display: grid;
    gap: 32px;
    align-items: center;
}
.feature-media,
.feature-panel {
    border-radius: 32px;
    background: var(--light);
    border: 1px solid var(--line);
    padding: 22px;
}
.feature-media img {
    border-radius: 24px;
    margin: 0 auto;
}
.check-list,
.simple-list {
    display: grid;
    gap: 10px;
    padding: 0;
    margin: 20px 0;
    list-style: none;
}
.check-list li,
.simple-list li {
    position: relative;
    padding-left: 28px;
    color: #344054;
}
.check-list li::before,
.simple-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .74em;
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: var(--brand-blue);
}
.global-nodes-section {
    background:
        radial-gradient(circle at 15% 20%, rgba(41,128,254,.16), transparent 28%),
        radial-gradient(circle at 80% 70%, rgba(184,77,218,.12), transparent 24%),
        #F7F9FD;
}
.map-panel {
    position: relative;
    min-height: 360px;
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: 32px;
    background: #fff;
    overflow: hidden;
}
.map-panel::before {
    content: "";
    position: absolute;
    inset: 30px;
    background-image:
        radial-gradient(circle, rgba(41,128,254,.35) 2px, transparent 3px),
        linear-gradient(90deg, rgba(41,128,254,.12) 1px, transparent 1px),
        linear-gradient(rgba(41,128,254,.12) 1px, transparent 1px);
    background-size: 82px 82px, 42px 42px, 42px 42px;
    border-radius: 24px;
}
.map-panel img {
    position: relative;
    z-index: 1;
    margin: 34px auto 0;
    border-radius: 24px;
}
.speed-lanes {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}
.speed-lane {
    padding: 14px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}
.speed-lane strong {
    display: block;
    margin-bottom: 4px;
}
.privacy-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 32px;
    padding: 26px;
    box-shadow: 0 18px 50px rgba(33,43,74,.08);
}
.privacy-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0;
}
.privacy-tags span {
    background: var(--soft-blue);
    color: var(--brand-blue);
    padding: 8px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}
.info-grid {
    display: grid;
    gap: 16px;
}
.info-card {
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: #fff;
}
.info-card h3 {
    margin: 0 0 10px;
}
.info-card p {
    margin: 0;
    color: var(--muted);
}
.device-stack {
    display: grid;
    gap: 14px;
}
.device-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px;
    border-radius: 22px;
    background: #fff;
    border: 1px solid var(--line);
}
.device-card .icon {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: var(--soft-blue);
    color: var(--brand-blue);
    display: grid;
    place-items: center;
    font-weight: 800;
}
.protocol-panel {
    display: grid;
    gap: 14px;
    padding: 22px;
    border-radius: 32px;
    background: #F8FAFF;
    border: 1px solid var(--line);
}
.protocol-row {
    display: grid;
    gap: 8px;
    padding: 16px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
}
.process-steps {
    display: grid;
    gap: 16px;
    counter-reset: step;
}
.step-card {
    position: relative;
    padding: 22px;
    border-radius: 24px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 10px 30px rgba(33,43,74,.06);
}
.step-card .step-num {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: var(--brand-blue);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 800;
    margin-bottom: 12px;
}
.safety-panel {
    border-radius: 32px;
    padding: 28px;
    background: #F7F9FD;
    border: 1px solid var(--line);
}
.risk-grid {
    display: grid;
    gap: 16px;
}
.risk-card {
    background: #fff;
    border: 1px solid var(--line);
    border-left: 4px solid var(--brand-blue);
    border-radius: 22px;
    padding: 18px;
}
.risk-card h3 {
    margin: 0 0 6px;
}
.risk-card p {
    margin: 0 0 8px;
    color: var(--muted);
}
.faq-list {
    display: grid;
    gap: 14px;
}
.faq-item {
    padding: 20px;
    border-radius: 22px;
    border: 1px solid var(--line);
    background: #fff;
}
.faq-item h3 {
    margin: 0 0 8px;
    font-size: 18px;
}
.faq-item p {
    margin: 0;
    color: var(--muted);
}
.cta-section {
    padding: 70px 0;
    background: var(--gradient);
    color: #fff;
    text-align: center;
}
.cta-card {
    width: min(780px, 100%);
    margin: 0 auto;
}
.cta-card h2 {
    font-size: clamp(28px, 5vw, 44px);
    margin: 0 0 14px;
}
.cta-card p {
    margin: 0 auto 24px;
    color: rgba(255,255,255,.88);
    max-width: 640px;
}
.page-hero {
    padding: 70px 0 44px;
    background:
        radial-gradient(circle at 20% 20%, rgba(41,128,254,.12), transparent 26%),
        linear-gradient(180deg, #F8FAFF 0%, #FFFFFF 100%);
}
.page-hero h1 {
    font-size: clamp(32px, 7vw, 54px);
    line-height: 1.14;
    margin: 0 0 16px;
}
.page-hero p {
    max-width: 780px;
    color: var(--muted);
    margin: 0;
}
.content-wrap {
    display: grid;
    gap: 28px;
}
.article-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
}
.article-panel h2 {
    margin-top: 0;
}
.article-panel p {
    color: #475467;
}
.aside-box {
    padding: 22px;
    border-radius: 24px;
    background: #F7F9FD;
    border: 1px solid var(--line);
}
.action-area {
    margin-top: 26px;
}
.guide-checklist,
.timeline-list {
    display: grid;
    gap: 12px;
    padding: 0;
    list-style: none;
}
.guide-checklist li,
.timeline-list li {
    padding: 14px 16px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}
.download-steps {
    display: grid;
    gap: 14px;
}
.download-step {
    padding: 18px;
    border-radius: 22px;
    border: 1px solid var(--line);
    background: #fff;
}
.download-step strong {
    color: var(--brand-blue);
}
.site-footer {
    padding: 50px 0 24px;
    background: #101828;
    color: #D0D5DD;
}
.footer-grid {
    display: grid;
    gap: 28px;
}
.footer-brand {
    color: #fff;
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 8px;
}
.site-footer h3 {
    color: #fff;
    margin: 0 0 12px;
}
.site-footer a {
    display: block;
    color: #D0D5DD;
    margin: 8px 0;
}
.site-footer a:hover {
    color: #fff;
}
.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 34px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.14);
    font-size: 14px;
    color: #98A2B3;
}
@media (min-width: 640px) {
    .node-grid,
    .info-grid,
    .risk-grid,
    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .float-tags {
        position: absolute;
        inset: auto 8px 8px auto;
        width: min(360px, 92%);
    }
}
@media (min-width: 900px) {
    .nav-toggle {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        border-radius: 0;
        box-shadow: none;
        background: transparent;
    }
    .site-nav a {
        padding: 8px 10px;
    }
    .hero-grid,
    .split-grid {
        grid-template-columns: 1.05fr .95fr;
    }
    .node-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    .info-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .content-wrap {
        grid-template-columns: minmax(0, 1fr) 310px;
        align-items: start;
    }
    .footer-grid {
        grid-template-columns: 1.4fr .8fr .8fr;
    }
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}
@media (min-width: 1120px) {
    .site-nav a {
        padding: 8px 12px;
    }
}
@media (max-width: 420px) {
    .container {
        width: min(100% - 24px, 1120px);
    }
    .section {
        padding: 54px 0;
    }
    .vpn-network-hero {
        padding: 56px 0 74px;
    }
    .download-btn {
        width: 100%;
    }
}