* {
    box-sizing: border-box;
}
:root {
    --primary: #2980FE;
    --primary-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #202635;
    --muted: #677286;
    --light: #F5F7FB;
    --soft-blue: #F0F6FF;
    --border: #E3E9F3;
    --white: #FFFFFF;
    --shadow: 0 18px 48px rgba(30, 65, 125, 0.12);
    --radius-lg: 30px;
    --radius: 22px;
}
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: #fff;
    line-height: 1.75;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
.container {
    width: min(100% - 32px, 1180px);
    margin: 0 auto;
}
.narrow {
    width: min(100% - 32px, 840px);
}
.gradient-bg {
    background: var(--gradient);
    color: #fff;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(227,233,243,0.9);
}
.header-inner {
    width: min(100% - 28px, 1180px);
    min-height: 68px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #18223A;
    letter-spacing: -0.02em;
}
.logo img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}
.site-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 72px;
    display: none;
    flex-direction: column;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow);
}
.site-nav.is-open {
    display: flex;
}
.site-nav a {
    padding: 10px 12px;
    color: #3B465A;
    font-size: 15px;
    border-radius: 12px;
}
.site-nav a:hover {
    background: var(--soft-blue);
    color: var(--primary);
}
.nav-download {
    color: var(--primary) !important;
    font-weight: 700;
}
.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--border);
    background: #fff;
    border-radius: 14px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}
.nav-toggle span {
    width: 18px;
    height: 2px;
    background: #1F2A44;
    border-radius: 99px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 28px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    line-height: 1;
    box-shadow: 0 12px 28px rgba(41,128,254,0.26);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(23,104,232,0.32);
}
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    padding: 76px 0 64px;
}
.vpn-network-hero::before,
.vpn-network-hero::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    filter: blur(4px);
}
.vpn-network-hero::before {
    width: 360px;
    height: 360px;
    right: -120px;
    top: -80px;
}
.vpn-network-hero::after {
    width: 240px;
    height: 240px;
    left: -90px;
    bottom: -80px;
}
.hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    gap: 42px;
    align-items: center;
}
.hero-copy h1 {
    margin: 14px 0 18px;
    font-size: clamp(34px, 8vw, 66px);
    line-height: 1.08;
    letter-spacing: -0.06em;
}
.hero-copy p,
.cta-inner p {
    color: rgba(255,255,255,0.86);
    font-size: 17px;
    margin: 0 0 26px;
}
.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    color: #fff;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.04em;
}
.eyebrow.blue,
.badge {
    background: rgba(41,128,254,0.10);
    color: var(--primary);
}
.eyebrow.light {
    background: rgba(255,255,255,0.16);
    color: #fff;
}
.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}
.hero-tags span,
.node-pills span,
.privacy-tags span,
.device-cards span {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.24);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
}
.network-visual {
    position: relative;
    min-height: 340px;
    border: 1px solid rgba(255,255,255,0.22);
    border-radius: var(--radius-lg);
    background: radial-gradient(circle at 20% 20%, rgba(255,255,255,0.30), transparent 28%), rgba(255,255,255,0.14);
    box-shadow: 0 28px 80px rgba(25, 34, 76, 0.28);
    overflow: hidden;
    padding: 28px;
}
.network-visual::before {
    content: "";
    position: absolute;
    inset: 24px;
    border-radius: 26px;
    background-image: linear-gradient(rgba(255,255,255,0.12) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.12) 1px, transparent 1px);
    background-size: 42px 42px;
    opacity: .75;
}
.network-visual img {
    position: relative;
    z-index: 2;
    width: min(86%, 460px);
    margin: 20px auto 0;
    filter: drop-shadow(0 28px 40px rgba(11, 20, 50, .28));
}
.status-card {
    position: absolute;
    z-index: 3;
    padding: 10px 14px;
    border-radius: 16px;
    background: rgba(255,255,255,0.92);
    color: #1E2944;
    font-weight: 800;
    font-size: 13px;
    box-shadow: 0 12px 30px rgba(21,40,90,.18);
}
.status-one { top: 28px; left: 24px; }
.status-two { top: 62px; right: 26px; }
.status-three { bottom: 70px; left: 28px; }
.status-four { right: 30px; bottom: 28px; }
.section {
    padding: 72px 0;
}
.soft-bg {
    background: var(--light);
}
.section-heading {
    text-align: center;
    margin-bottom: 32px;
}
.section-heading.compact {
    width: min(100%, 800px);
    margin-left: auto;
    margin-right: auto;
}
h1, h2, h3 {
    line-height: 1.25;
    color: #172139;
}
.gradient-bg h1,
.gradient-bg h2,
.tech-panel-section h2,
.network-map h2 {
    color: #fff;
}
h2 {
    font-size: clamp(26px, 4vw, 42px);
    margin: 12px 0 14px;
    letter-spacing: -0.04em;
}
h3 {
    margin: 0 0 8px;
    font-size: 19px;
}
p {
    color: var(--muted);
}
.node-overview {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.node-card,
.content-card,
.side-panel,
.faq-item,
.risk-grid article,
.process-steps article,
.three-cards article,
.mini-card-list article {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(40, 60, 110, 0.06);
}
.node-card {
    padding: 22px;
}
.card-tag {
    display: inline-flex;
    margin-bottom: 14px;
    padding: 5px 10px;
    border-radius: 999px;
    background: rgba(41,128,254,0.10);
    color: var(--primary);
    font-size: 12px;
    font-weight: 800;
}
.node-card a,
.text-link,
.process-steps a,
.risk-grid a,
.related-links a {
    color: var(--primary);
    font-weight: 800;
}
.split-grid,
.speed-grid,
.privacy-grid,
.device-grid,
.tech-grid,
.nodes-grid,
.article-layout,
.two-column-page,
.about-layout {
    display: grid;
    gap: 28px;
    align-items: center;
}
.split-image,
.floating-panel,
.privacy-panel,
.map-card,
.protocol-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #fff;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 18px;
}
.split-image img,
.privacy-panel img,
.map-card img,
.protocol-card img {
    width: 100%;
    border-radius: 22px;
}
.check-list {
    list-style: none;
    padding: 0;
    margin: 18px 0 22px;
}
.check-list li {
    position: relative;
    padding-left: 28px;
    margin: 10px 0;
    color: #4F5B70;
}
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .65em;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(41,128,254,0.12);
}
.network-map,
.tech-panel-section {
    background: radial-gradient(circle at 20% 20%, rgba(255,255,255,.16), transparent 28%), var(--gradient);
    color: #fff;
    overflow: hidden;
}
.network-map p,
.tech-panel-section p,
.light-link {
    color: rgba(255,255,255,0.84);
}
.map-card,
.protocol-card {
    position: relative;
    background: rgba(255,255,255,0.14);
    border-color: rgba(255,255,255,0.22);
}
.map-note {
    margin-top: 14px;
    padding: 12px 14px;
    border-radius: 16px;
    background: rgba(255,255,255,0.16);
    color: #fff;
    font-weight: 700;
}
.node-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0;
}
.speed-lines .metric-stack {
    display: grid;
    gap: 12px;
    margin: 22px 0;
}
.metric-stack div {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: #fff;
}
.metric-stack span {
    color: var(--muted);
    text-align: right;
}
.privacy-panel {
    display: grid;
    gap: 14px;
}
.privacy-tags,
.device-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.privacy-tags span,
.device-cards span {
    background: var(--soft-blue);
    color: var(--primary);
    border-color: rgba(41,128,254,0.12);
}
.three-cards,
.risk-grid,
.faq-list,
.process-steps {
    display: grid;
    gap: 16px;
}
.three-cards article,
.risk-grid article,
.process-steps article {
    padding: 22px;
}
.center-link {
    text-align: center;
    margin-top: 24px;
}
.protocol-card ul {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    list-style: none;
    padding: 0;
    margin: 16px 0 0;
}
.protocol-card li {
    padding: 10px;
    border-radius: 14px;
    background: rgba(255,255,255,0.16);
    color: #fff;
    text-align: center;
    font-weight: 800;
}
.process-steps article span {
    display: inline-flex;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
    margin-bottom: 14px;
}
.risk-grid article {
    border-left: 4px solid var(--primary);
}
.risk-grid strong {
    color: #172139;
    margin-right: 6px;
}
.risk-grid span {
    color: var(--muted);
}
.risk-grid a {
    display: inline-block;
    margin-top: 10px;
}
.faq-item {
    padding: 22px;
}
.faq-item h2,
.faq-item h3 {
    font-size: 19px;
    margin: 0 0 8px;
}
.cta-section {
    padding: 68px 0;
    text-align: center;
}
.cta-inner {
    max-width: 760px;
}
.page-hero {
    padding: 70px 0 50px;
    background: linear-gradient(180deg, #F3F7FF 0%, #FFFFFF 100%);
    text-align: center;
}
.page-hero h1 {
    font-size: clamp(34px, 6vw, 56px);
    margin: 16px 0 14px;
    letter-spacing: -0.05em;
}
.page-hero p {
    font-size: 17px;
    margin: 0 auto 24px;
    max-width: 760px;
}
.content-card,
.side-panel {
    padding: 24px;
}
.rich-text h2 {
    font-size: 26px;
    margin-top: 28px;
}
.rich-text h2:first-child {
    margin-top: 0;
}
.lead-text {
    font-size: 18px;
    color: #3E4A5F;
}
.tip-box {
    display: grid;
    gap: 6px;
    padding: 18px;
    margin: 24px 0;
    border-radius: 18px;
    background: var(--soft-blue);
    border: 1px solid rgba(41,128,254,0.18);
    color: #43506A;
}
.tip-box strong {
    color: var(--primary);
}
.mini-card-list {
    display: grid;
    gap: 12px;
}
.mini-card-list article {
    padding: 16px;
    box-shadow: none;
}
.related-links {
    display: grid;
    gap: 8px;
    margin-top: 20px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
}
.number-list {
    padding-left: 22px;
}
.number-list li {
    margin: 12px 0;
    color: var(--muted);
}
.site-footer {
    background: #F7F9FC;
    border-top: 1px solid var(--border);
    padding: 50px 0 0;
}
.footer-grid {
    display: grid;
    gap: 28px;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
.footer-brand img {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    object-fit: cover;
}
.site-footer h3 {
    font-size: 16px;
}
.site-footer a {
    display: block;
    color: var(--muted);
    margin: 8px 0;
}
.site-footer a:hover {
    color: var(--primary);
}
.footer-bottom {
    margin-top: 34px;
    padding: 18px;
    text-align: center;
    color: var(--muted);
    border-top: 1px solid var(--border);
    font-size: 14px;
}
@media (min-width: 700px) {
    .node-overview { grid-template-columns: repeat(2, 1fr); }
    .three-cards { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .faq-list { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); }
}
@media (min-width: 960px) {
    .nav-toggle { display: none; }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }
    .site-nav a {
        font-size: 14px;
        padding: 8px 9px;
    }
    .hero-grid,
    .split-grid,
    .speed-grid,
    .privacy-grid,
    .device-grid,
    .tech-grid,
    .nodes-grid {
        grid-template-columns: 1.05fr .95fr;
    }
    .hero-grid { gap: 56px; }
    .node-overview { grid-template-columns: repeat(4, 1fr); }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .article-layout,
    .about-layout,
    .two-column-page {
        grid-template-columns: minmax(0, 1fr) 340px;
        align-items: start;
    }
    .sticky-panel {
        position: sticky;
        top: 94px;
    }
    .content-card,
    .side-panel { padding: 32px; }
}
@media (min-width: 1120px) {
    .site-nav a { padding: 8px 11px; }
}
@media (max-width: 520px) {
    .container { width: min(100% - 24px, 1180px); }
    .vpn-network-hero { padding: 54px 0 44px; }
    .section { padding: 54px 0; }
    .network-visual { min-height: 280px; padding: 18px; }
    .status-card { font-size: 12px; padding: 8px 10px; }
    .status-two { top: 54px; right: 14px; }
    .status-three { bottom: 54px; left: 14px; }
    .status-four { right: 14px; }
    .metric-stack div { display: block; }
    .metric-stack span { display: block; text-align: left; margin-top: 6px; }
    .protocol-card ul { grid-template-columns: 1fr; }
    .download-btn { width: 100%; max-width: 320px; }
    .page-hero { padding: 54px 0 38px; }
}