:root {
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --purple: #7B4EF1;
    --pink: #B84DDA;
    --ink: #1F2937;
    --text: #4B5563;
    --muted: #6B7280;
    --line: #E5E7EB;
    --soft: #F6F8FC;
    --soft-blue: #EEF5FF;
    --white: #FFFFFF;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --shadow: 0 18px 50px rgba(31, 41, 55, .10);
    --radius: 24px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", 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%; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.section { padding: 64px 0; }
.section.soft { background: var(--soft); }
.section-title { margin: 0 0 14px; color: var(--ink); font-size: clamp(28px, 4vw, 42px); line-height: 1.2; letter-spacing: -.04em; }
.section-lead { margin: 0 0 26px; color: var(--muted); font-size: 16px; }
.badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: 999px; background: var(--soft-blue); color: var(--blue); font-weight: 700; font-size: 14px; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.92); backdrop-filter: blur(14px); border-bottom: 1px solid rgba(229,231,235,.9); }
.header-inner { width: min(1180px, calc(100% - 28px)); margin: 0 auto; min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; letter-spacing: -.02em; }
.brand img { width: 42px; height: 42px; border-radius: 14px; object-fit: cover; box-shadow: 0 8px 20px rgba(41,128,254,.18); }
.site-nav { display: none; position: absolute; left: 14px; right: 14px; top: 76px; padding: 12px; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: var(--shadow); }
.site-nav.is-open { display: grid; gap: 4px; }
.site-nav a { padding: 10px 12px; border-radius: 12px; color: var(--text); font-size: 14px; font-weight: 700; }
.site-nav a:hover, .site-nav a.active { background: var(--soft-blue); color: var(--blue); }
.nav-toggle { border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 12px; padding: 8px 12px; font-weight: 700; }
.download-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 12px 22px; border-radius: 999px; background: var(--blue); color: #fff; font-weight: 800; box-shadow: 0 14px 28px rgba(41,128,254,.28); transition: transform .2s ease, background .2s ease, box-shadow .2s ease; }
.download-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 18px 34px rgba(23,104,232,.32); }
.link { color: var(--blue); font-weight: 800; }
.vpn-network-hero { position: relative; overflow: hidden; color: #fff; background: var(--gradient); }
.vpn-network-hero:before { content: ""; position: absolute; inset: 0; opacity: .22; background-image: radial-gradient(circle at 20% 30%, #fff 0 2px, transparent 3px), radial-gradient(circle at 70% 20%, #fff 0 2px, transparent 3px), radial-gradient(circle at 80% 70%, #fff 0 2px, transparent 3px), linear-gradient(115deg, transparent 0 35%, rgba(255,255,255,.24) 36%, transparent 37% 100%); background-size: 190px 160px, 240px 180px, 180px 140px, 100% 100%; }
.hero-inner { position: relative; display: grid; gap: 36px; align-items: center; min-height: 680px; padding: 56px 0; }
.hero-copy h1 { margin: 0 0 18px; font-size: clamp(36px, 9vw, 66px); line-height: 1.08; letter-spacing: -.06em; color: #fff; }
.hero-copy p { margin: 0 0 24px; max-width: 640px; color: rgba(255,255,255,.88); font-size: 17px; }
.hero-tags, .floating-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span, .floating-tags span { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.24); color: #fff; font-size: 13px; font-weight: 700; }
.hero-visual { position: relative; border-radius: 34px; padding: 18px; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.22); box-shadow: 0 30px 70px rgba(31,41,55,.26); }
.hero-visual img { width: 100%; border-radius: 28px; background: rgba(255,255,255,.15); }
.status-card { position: absolute; right: 8px; bottom: 18px; width: min(260px, 82%); padding: 14px; border-radius: 20px; background: rgba(255,255,255,.94); color: var(--ink); box-shadow: 0 18px 40px rgba(31,41,55,.16); }
.status-card strong { display: block; color: var(--blue); }
.node-overview { display: grid; gap: 16px; margin-top: -42px; position: relative; z-index: 2; }
.node-card, .feature-card, .risk-card, .faq-item, .info-card, .step-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: 0 12px 35px rgba(31,41,55,.06); }
.node-card .tag { display: inline-block; margin-bottom: 12px; padding: 4px 10px; border-radius: 999px; background: var(--soft-blue); color: var(--blue); font-size: 12px; font-weight: 800; }
.node-card h3, .feature-card h3, .risk-card h3, .faq-item h3, .info-card h3, .step-card h3 { margin: 0 0 8px; color: var(--ink); line-height: 1.3; }
.node-card p, .feature-card p, .risk-card p, .faq-item p, .info-card p, .step-card p { margin: 0 0 12px; color: var(--muted); }
.split, .vpn-connection-section, .high-speed-section, .privacy-protection-section, .multi-device-section, .encryption-protocol-section { display: grid; gap: 28px; align-items: center; }
.image-panel { border-radius: 30px; padding: 14px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.image-panel img { border-radius: 24px; width: 100%; }
.points { display: grid; gap: 12px; margin: 20px 0; padding: 0; list-style: none; }
.points li { padding: 13px 14px; border-radius: 16px; background: var(--soft); border: 1px solid var(--line); color: var(--text); }
.global-nodes-section { position: relative; overflow: hidden; border-radius: 34px; background: linear-gradient(135deg, #F8FBFF, #EEF5FF); border: 1px solid var(--line); padding: 28px; }
.global-nodes-section:before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(circle at 25% 28%, rgba(41,128,254,.35) 0 5px, transparent 6px), radial-gradient(circle at 66% 48%, rgba(123,78,241,.32) 0 5px, transparent 6px), radial-gradient(circle at 82% 72%, rgba(184,77,218,.28) 0 5px, transparent 6px), linear-gradient(115deg, transparent 0 28%, rgba(41,128,254,.16) 29%, transparent 30% 100%); opacity: .9; }
.global-nodes-section > * { position: relative; }
.speed-lines { display: grid; gap: 12px; }
.speed-line { padding: 14px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.speed-line span { display: block; height: 8px; margin-top: 10px; border-radius: 999px; background: linear-gradient(90deg, var(--blue), #9AC3FF); }
.privacy-panel { background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 26px; box-shadow: var(--shadow); }
.privacy-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.privacy-tags span { border: 1px solid var(--line); border-radius: 999px; padding: 8px 12px; background: var(--soft-blue); color: var(--blue); font-weight: 800; font-size: 13px; }
.card-grid { display: grid; gap: 16px; }
.no-log-policy-section .card-grid { margin-top: 22px; }
.device-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.device-card { padding: 18px; border-radius: 22px; background: #fff; border: 1px solid var(--line); box-shadow: 0 10px 24px rgba(31,41,55,.05); }
.tech-panel { border: 1px solid var(--line); border-radius: 30px; background: #fff; padding: 24px; box-shadow: var(--shadow); }
.protocol-list { display: grid; gap: 12px; margin-top: 14px; }
.protocol-list div { border-left: 4px solid var(--blue); padding: 12px 14px; background: var(--soft); border-radius: 14px; }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding-left: 72px; }
.step-card:before { counter-increment: step; content: counter(step); position: absolute; left: 20px; top: 24px; width: 36px; height: 36px; border-radius: 12px; display: grid; place-items: center; background: var(--blue); color: #fff; font-weight: 900; }
.risk-grid { display: grid; gap: 16px; }
.risk-card { border-left: 4px solid var(--blue); }
.faq-list { display: grid; gap: 14px; }
.cta-section { text-align: center; color: #fff; background: var(--gradient); border-radius: 36px; padding: 46px 20px; position: relative; overflow: hidden; }
.cta-section:before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 22% 25%, rgba(255,255,255,.26), transparent 28%), radial-gradient(circle at 82% 72%, rgba(255,255,255,.20), transparent 30%); }
.cta-section > * { position: relative; }
.cta-section h2 { margin: 0 0 12px; color: #fff; font-size: clamp(26px, 5vw, 42px); }
.cta-section p { margin: 0 auto 22px; max-width: 690px; color: rgba(255,255,255,.88); }
.page-hero { padding: 54px 0 28px; background: linear-gradient(180deg, #F7FAFF, #fff); }
.page-hero .container { display: grid; gap: 14px; }
.page-hero h1 { margin: 0; color: var(--ink); font-size: clamp(34px, 7vw, 56px); line-height: 1.12; letter-spacing: -.05em; }
.page-hero p { margin: 0; max-width: 820px; color: var(--muted); font-size: 17px; }
.article-layout { display: grid; gap: 24px; align-items: start; }
.article-main { background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 24px; box-shadow: 0 12px 36px rgba(31,41,55,.06); }
.article-main h2 { color: var(--ink); margin-top: 0; }
.aside-panel { background: var(--soft); border: 1px solid var(--line); border-radius: 26px; padding: 22px; }
.aside-panel h3 { color: var(--ink); margin-top: 0; }
.check-list { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 10px; }
.check-list li { padding: 12px 14px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
.download-page-panel { text-align: center; max-width: 820px; margin: 0 auto; }
.download-page-panel .download-btn { margin: 22px 0; }
.numbered { counter-reset: item; list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 12px; }
.numbered li { counter-increment: item; display: grid; grid-template-columns: 38px 1fr; gap: 12px; align-items: start; padding: 14px; background: var(--soft); border: 1px solid var(--line); border-radius: 18px; }
.numbered li:before { content: counter(item); width: 32px; height: 32px; display: grid; place-items: center; border-radius: 10px; background: var(--blue); color: #fff; font-weight: 900; }
.site-footer { background: #111827; color: #D1D5DB; padding: 46px 0 0; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { color: #fff; font-size: 22px; font-weight: 900; margin-bottom: 10px; }
.site-footer h3 { color: #fff; margin: 0 0 10px; }
.site-footer a { display: block; color: #D1D5DB; margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 32px; padding: 18px 16px; text-align: center; border-top: 1px solid rgba(255,255,255,.1); color: #9CA3AF; }
@media (min-width: 640px) {
    .node-overview, .card-grid, .risk-grid, .process-steps { grid-template-columns: repeat(2, 1fr); }
    .device-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; align-items: center; gap: 2px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .hero-inner { grid-template-columns: 1.04fr .96fr; }
    .split, .vpn-connection-section, .high-speed-section, .privacy-protection-section, .multi-device-section, .encryption-protocol-section { grid-template-columns: 1fr 1fr; }
    .node-overview { grid-template-columns: repeat(4, 1fr); }
    .card-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .article-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .article-main { padding: 34px; }
    .footer-grid { grid-template-columns: 1.4fr .8fr .8fr; }
}
@media (max-width: 480px) {
    .container { width: min(100% - 24px, 1120px); }
    .section { padding: 46px 0; }
    .hero-inner { min-height: auto; padding: 46px 0 78px; }
    .download-btn { width: 100%; }
    .status-card { position: static; width: 100%; margin-top: 12px; }
    .node-overview { margin-top: -34px; }
    .global-nodes-section, .cta-section { border-radius: 26px; }
}