* {
    box-sizing: border-box;
}
:root {
    --primary: #2980FE;
    --primary-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #263143;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E5EAF2;
    --white: #ffffff;
    --soft-blue: #EEF5FF;
    --radius-lg: 28px;
    --radius-md: 20px;
    --shadow: 0 18px 46px rgba(35, 54, 92, .12);
}
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: 1.7;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}
.header-inner {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand,
.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo,
.footer-logo {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 8px 20px rgba(41,128,254,.18);
}
.brand-text {
    font-weight: 800;
    font-size: 20px;
    letter-spacing: .02em;
}
.nav-toggle {
    display: none;
}
.nav-toggle-label {
    display: flex;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}
.nav-toggle-label span {
    width: 18px;
    height: 2px;
    border-radius: 10px;
    background: var(--text);
}
.main-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .main-nav {
    display: flex;
}
.main-nav a {
    padding: 10px 12px;
    color: #4B5565;
    border-radius: 12px;
    font-size: 15px;
}
.main-nav a:hover,
.main-nav a.active {
    color: var(--primary);
    background: var(--soft-blue);
}
.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}
.narrow-container {
    width: min(920px, calc(100% - 32px));
    margin: 0 auto;
}
.section {
    padding: 72px 0;
}
.section-soft {
    background: var(--light);
}
.section-title {
    font-size: clamp(28px, 5vw, 44px);
    line-height: 1.18;
    margin: 0 0 18px;
    letter-spacing: -.03em;
}
.section-subtitle {
    margin: 0 0 30px;
    color: var(--muted);
    font-size: 17px;
}
.badge,
.category-badge,
.hero-tag,
.panel-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 30px;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    color: var(--primary);
    background: rgba(41,128,254,.10);
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(41,128,254,.28);
    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 32px rgba(23,104,232,.28);
}
.text-link {
    color: var(--primary);
    font-weight: 700;
}
.text-link:hover {
    text-decoration: underline;
}
.hero-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    color: #fff;
    background: var(--gradient);
    padding: 78px 0 92px;
}
.vpn-network-hero:before,
.vpn-network-hero:after,
.global-nodes-section:before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.vpn-network-hero:before {
    background-image:
        radial-gradient(circle at 18% 32%, rgba(255,255,255,.24) 0 2px, transparent 3px),
        radial-gradient(circle at 62% 20%, rgba(255,255,255,.22) 0 2px, transparent 3px),
        radial-gradient(circle at 78% 72%, rgba(255,255,255,.22) 0 2px, transparent 3px),
        linear-gradient(120deg, transparent 0 20%, rgba(255,255,255,.14) 20.2%, transparent 20.6% 52%, rgba(255,255,255,.12) 52.2%, transparent 52.8%);
    opacity: .9;
}
.vpn-network-hero:after {
    width: 440px;
    height: 440px;
    left: -140px;
    top: -120px;
    border-radius: 50%;
    background: rgba(255,255,255,.16);
    filter: blur(10px);
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 40px;
    align-items: center;
}
.hero-content h1 {
    font-size: clamp(38px, 10vw, 68px);
    line-height: 1.05;
    margin: 16px 0 18px;
    letter-spacing: -.05em;
}
.hero-content p {
    max-width: 620px;
    margin: 0 0 26px;
    color: rgba(255,255,255,.88);
    font-size: 18px;
}
.hero-tag {
    color: #fff;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.22);
}
.hero-visual {
    position: relative;
    min-height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.hero-device {
    width: min(440px, 86vw);
    border-radius: 32px;
    background: rgba(255,255,255,.14);
    padding: 18px;
    box-shadow: 0 30px 70px rgba(25,32,74,.22);
}
.status-card {
    position: absolute;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    color: #263143;
    background: rgba(255,255,255,.92);
    border: 1px solid rgba(255,255,255,.55);
    border-radius: 16px;
    box-shadow: 0 14px 32px rgba(37,45,84,.16);
    font-size: 14px;
    font-weight: 800;
}
.status-card:before,
.node-dot:before {
    content: "";
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(41,128,254,.14);
}
.status-one { top: 22px; left: 2px; }
.status-two { top: 86px; right: 0; }
.status-three { bottom: 74px; left: 8px; }
.status-four { bottom: 20px; right: 16px; }
.node-overview {
    margin-top: -46px;
    position: relative;
    z-index: 4;
}
.node-grid,
.card-grid,
.risk-grid,
.faq-grid,
.related-grid {
    display: grid;
    gap: 18px;
}
.node-card,
.info-card,
.risk-card,
.faq-item,
.related-card,
.step-card,
.policy-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 12px 30px rgba(29, 42, 68, .06);
}
.node-card h3,
.info-card h3,
.risk-card h3,
.faq-item h3,
.step-card h3,
.policy-card h3 {
    margin: 10px 0 8px;
    font-size: 20px;
}
.node-card p,
.info-card p,
.risk-card p,
.faq-item p,
.step-card p,
.policy-card p,
.feature-text p,
.page-summary,
.article-body p {
    color: var(--muted);
}
.node-label {
    display: inline-block;
    color: var(--primary);
    background: rgba(41,128,254,.1);
    border-radius: 999px;
    padding: 3px 9px;
    font-size: 12px;
    font-weight: 800;
}
.feature-split,
.privacy-grid,
.device-grid,
.protocol-grid,
.download-grid,
.about-grid,
.page-grid {
    display: grid;
    gap: 32px;
    align-items: center;
}
.feature-image,
.panel-image {
    border-radius: var(--radius-lg);
    background: var(--soft-blue);
    padding: 18px;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.feature-list,
.check-list,
.number-list {
    margin: 22px 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 12px;
}
.feature-list li,
.check-list li,
.number-list li {
    position: relative;
    padding-left: 28px;
    color: #435064;
}
.feature-list li:before,
.check-list li:before {
    content: "";
    position: absolute;
    left: 0;
    top: .55em;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(41,128,254,.1);
}
.global-nodes-section {
    position: relative;
    overflow: hidden;
    background: #F7FAFF;
}
.global-nodes-section:before {
    background-image:
      radial-gradient(circle at 16% 30%, rgba(41,128,254,.2) 0 2px, transparent 3px),
      radial-gradient(circle at 74% 36%, rgba(123,78,241,.18) 0 2px, transparent 3px),
      radial-gradient(circle at 52% 72%, rgba(184,77,218,.17) 0 2px, transparent 3px),
      linear-gradient(110deg, transparent 0 18%, rgba(41,128,254,.1) 18.2%, transparent 18.6% 60%, rgba(123,78,241,.1) 60.2%, transparent 60.8%);
}
.global-nodes-section .container { position: relative; z-index: 1; }
.map-panel {
    background: rgba(255,255,255,.78);
    border: 1px solid rgba(229,234,242,.9);
    border-radius: 32px;
    padding: 22px;
    box-shadow: var(--shadow);
}
.node-lines {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}
.node-line {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 12px 14px;
    border-radius: 16px;
    background: #fff;
    border: 1px solid var(--line);
}
.node-dot {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
}
.speed-panel {
    display: grid;
    gap: 14px;
    margin-top: 22px;
}
.speed-row {
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}
.speed-track {
    height: 8px;
    border-radius: 999px;
    background: #E8EEF7;
    margin-top: 10px;
    overflow: hidden;
}
.speed-fill {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: var(--primary);
}
.speed-fill.w70 { width: 70%; }
.speed-fill.w82 { width: 82%; }
.speed-fill.w58 { width: 58%; }
.privacy-panel,
.protocol-panel,
.safety-panel,
.download-panel {
    border-radius: 32px;
    background: #fff;
    border: 1px solid var(--line);
    padding: 24px;
    box-shadow: var(--shadow);
}
.privacy-wall {
    display: grid;
    gap: 12px;
    margin-top: 20px;
}
.wall-item {
    padding: 16px;
    border-radius: 18px;
    background: var(--light);
    border-left: 4px solid var(--primary);
}
.policy-row {
    display: grid;
    gap: 18px;
}
.device-card {
    position: relative;
    border-radius: 28px;
    padding: 24px;
    background: var(--gradient);
    color: #fff;
    overflow: hidden;
}
.device-card p { color: rgba(255,255,255,.86); }
.protocol-stack {
    display: grid;
    gap: 14px;
}
.protocol-item {
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}
.process-steps {
    display: grid;
    gap: 16px;
    counter-reset: step;
}
.step-card {
    position: relative;
    padding-top: 54px;
}
.step-number {
    position: absolute;
    left: 22px;
    top: 18px;
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: var(--primary);
    border-radius: 50%;
    font-weight: 800;
}
.risk-card {
    border-top: 4px solid var(--primary);
}
.risk-card strong {
    color: #29364A;
}
.cta-section {
    position: relative;
    overflow: hidden;
    color: #fff;
    background: var(--gradient);
    text-align: center;
    padding: 72px 0;
}
.cta-section p {
    max-width: 720px;
    margin: 0 auto 24px;
    color: rgba(255,255,255,.88);
}
.cta-section .download-btn {
    background: var(--primary);
}
.page-hero {
    background: linear-gradient(180deg, #F4F8FF 0%, #fff 100%);
    padding: 58px 0 36px;
}
.page-hero h1 {
    font-size: clamp(32px, 7vw, 54px);
    line-height: 1.12;
    margin: 14px 0 14px;
    letter-spacing: -.04em;
}
.page-summary {
    max-width: 760px;
    font-size: 18px;
    margin: 0;
}
.article-body {
    padding: 34px 0 72px;
}
.article-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: 0 12px 30px rgba(29,42,68,.05);
}
.article-card h2 {
    margin-top: 0;
    font-size: 26px;
}
.sidebar-card {
    background: var(--light);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
}
.sidebar-card h3 { margin-top: 0; }
.sidebar-card a {
    display: block;
    color: var(--primary);
    font-weight: 700;
    padding: 7px 0;
}
.download-grid .download-panel {
    text-align: center;
}
.download-steps {
    display: grid;
    gap: 16px;
}
.download-step {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    padding: 18px;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: #fff;
}
.download-step span {
    flex: 0 0 34px;
    height: 34px;
    border-radius: 50%;
    color: #fff;
    background: var(--primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
}
.faq-list {
    display: grid;
    gap: 16px;
}
.faq-item h2,
.faq-item h3 {
    margin-top: 0;
    font-size: 20px;
}
.site-footer {
    background: #101828;
    color: #fff;
    padding: 44px 0;
}
.footer-inner {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 24px;
}
.footer-brand p,
.footer-note {
    color: rgba(255,255,255,.68);
    margin: 4px 0 0;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 18px;
}
.footer-links a {
    color: rgba(255,255,255,.82);
}
.footer-links a:hover { color: #fff; }
@media (min-width: 680px) {
    .node-grid { grid-template-columns: repeat(2, 1fr); }
    .card-grid,
    .risk-grid,
    .related-grid,
    .policy-row { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
    .nav-toggle-label { display: none; }
    .main-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        background: transparent;
        box-shadow: none;
    }
    .main-nav a { font-size: 14px; padding: 8px 10px; }
    .hero-grid,
    .feature-split,
    .privacy-grid,
    .device-grid,
    .protocol-grid,
    .download-grid,
    .about-grid { grid-template-columns: 1.05fr .95fr; }
    .page-grid { grid-template-columns: minmax(0, 1fr) 300px; align-items: start; }
    .node-grid { grid-template-columns: repeat(4, 1fr); }
    .card-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .policy-row { grid-template-columns: repeat(3, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .section { padding: 92px 0; }
}
@media (max-width: 420px) {
    .container,
    .narrow-container,
    .header-inner,
    .footer-inner { width: min(100% - 24px, 1120px); }
    .download-btn { width: 100%; }
    .hero-visual { min-height: 310px; }
    .status-card { font-size: 12px; padding: 8px 10px; }
    .status-one { top: 10px; }
    .status-two { top: 58px; }
    .status-three { bottom: 56px; }
    .status-four { bottom: 8px; }
}