:root {
    --gradient-main: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --text: #253044;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E5EAF2;
    --card: #FFFFFF;
    --deep: #172033;
    --radius-lg: 28px;
    --radius-md: 20px;
    --shadow-soft: 0 18px 48px rgba(27, 45, 90, 0.10);
}
* { box-sizing: border-box; }
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: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 16px; color: var(--muted); }
h1, h2, h3 { margin: 0; line-height: 1.2; color: var(--deep); }
ul, ol { margin: 0; padding-left: 20px; color: var(--muted); }
.content-container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.gradient-background { background: var(--gradient-main); color: #fff; }
.section { padding: 64px 0; }
.section-light { background: var(--light); }
.section-head { max-width: 760px; margin-bottom: 28px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.section-kicker, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--blue);
    background: rgba(41, 128, 254, 0.10);
    border: 1px solid rgba(41, 128, 254, 0.16);
    padding: 6px 12px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 13px;
    margin-bottom: 12px;
}
.section-head h2, .simple-hero h1 { font-size: clamp(28px, 4vw, 46px); margin-bottom: 14px; }
.section-head p, .simple-hero p { font-size: 16px; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(229, 234, 242, 0.9);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--deep); font-size: 20px; }
.logo img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 22px rgba(41, 128, 254, 0.18); }
.mobile-nav-toggle { width: 44px; height: 44px; display: inline-flex; flex-direction: column; justify-content: center; gap: 5px; border: 1px solid var(--line); border-radius: 14px; background: #fff; cursor: pointer; }
.mobile-nav-toggle span { display: block; width: 20px; height: 2px; background: var(--deep); margin: 0 auto; border-radius: 2px; }
.site-nav { position: absolute; left: 16px; right: 16px; top: 74px; display: none; flex-direction: column; gap: 4px; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow-soft); }
.site-nav.open { display: flex; }
.site-nav a { color: #445066; font-weight: 650; padding: 10px 12px; border-radius: 12px; }
.site-nav a.active, .site-nav a:hover { color: var(--blue); background: rgba(41, 128, 254, 0.08); }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    background: var(--blue);
    color: #fff;
    border-radius: 999px;
    font-weight: 800;
    letter-spacing: 0.02em;
    box-shadow: 0 12px 28px rgba(41, 128, 254, 0.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--blue-hover); transform: translateY(-2px); box-shadow: 0 18px 34px rgba(23, 104, 232, 0.28); }
.vpn-network-hero { position: relative; overflow: hidden; padding: 72px 0 42px; background: var(--gradient-main); }
.vpn-network-hero::before, .vpn-network-hero::after { content: ""; position: absolute; border-radius: 50%; background: rgba(255,255,255,.16); filter: blur(2px); }
.vpn-network-hero::before { width: 420px; height: 420px; right: -160px; top: -110px; }
.vpn-network-hero::after { width: 300px; height: 300px; left: -120px; bottom: -120px; }
.hero-grid { position: relative; z-index: 1; display: grid; gap: 36px; align-items: center; }
.hero-copy h1 { color: #fff; font-size: clamp(34px, 7vw, 62px); margin-bottom: 18px; letter-spacing: -0.04em; }
.hero-copy p { color: rgba(255,255,255,.86); font-size: 17px; max-width: 640px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 28px; }
.hero-tags span { color: #fff; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.24); padding: 7px 12px; border-radius: 999px; font-weight: 700; font-size: 13px; }
.hero-visual { position: relative; min-height: 300px; display: grid; place-items: center; }
.hero-visual::before { content: ""; position: absolute; inset: 12%; border: 1px solid rgba(255,255,255,.22); border-radius: 48%; transform: rotate(-12deg); }
.hero-visual::after { content: ""; position: absolute; inset: 22%; border: 1px dashed rgba(255,255,255,.25); border-radius: 50%; }
.hero-visual img { position: relative; z-index: 1; max-height: 410px; object-fit: contain; filter: drop-shadow(0 28px 44px rgba(24, 24, 80, .22)); }
.status-card { position: absolute; z-index: 2; display: inline-flex; align-items: center; gap: 8px; padding: 10px 14px; color: #243044; background: rgba(255,255,255,.90); border: 1px solid rgba(255,255,255,.7); border-radius: 16px; box-shadow: 0 16px 35px rgba(25, 34, 80, .18); font-weight: 800; font-size: 13px; }
.status-card::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--blue); }
.status-card.one { top: 10px; left: 4px; }
.status-card.two { right: 0; top: 64px; }
.status-card.three { left: 16px; bottom: 58px; }
.status-card.four { right: 16px; bottom: 18px; }
.node-overview { margin-top: -18px; position: relative; z-index: 4; display: grid; gap: 16px; }
.node-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: var(--shadow-soft);
}
.node-card .tag { display: inline-block; color: var(--blue); background: rgba(41,128,254,.10); border-radius: 999px; padding: 4px 10px; font-weight: 800; font-size: 12px; margin-bottom: 12px; }
.node-card h3 { font-size: 20px; margin-bottom: 8px; }
.text-link { color: var(--blue); font-weight: 800; display: inline-flex; margin-top: 8px; }
.feature-split, .vpn-connection-section, .global-nodes-section, .high-speed-section, .privacy-protection-section, .multi-device-section, .encryption-protocol-section { display: grid; gap: 28px; align-items: center; }
.feature-panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 28px; box-shadow: var(--shadow-soft); }
.feature-panel h2 { font-size: clamp(26px, 4vw, 42px); margin-bottom: 14px; }
.feature-image { background: radial-gradient(circle at 30% 20%, rgba(41,128,254,.16), transparent 34%), #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 18px; box-shadow: var(--shadow-soft); }
.feature-list { display: grid; gap: 10px; margin: 20px 0; }
.feature-list li { background: #F7FAFF; border: 1px solid #E7EEF9; border-radius: 14px; padding: 12px 14px; list-style: none; }
.map-card { position: relative; overflow: hidden; background: linear-gradient(135deg, #F8FAFF, #FFFFFF); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 26px; box-shadow: var(--shadow-soft); }
.map-card::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(circle, rgba(41,128,254,.28) 1px, transparent 1.5px); background-size: 30px 30px; opacity: .6; }
.map-card > * { position: relative; z-index: 1; }
.line-stat { display: grid; gap: 12px; margin-top: 18px; }
.line-stat div { display: flex; justify-content: space-between; gap: 16px; padding: 14px; border: 1px solid var(--line); border-radius: 15px; background: #fff; }
.privacy-panel, .safety-panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 26px; box-shadow: var(--shadow-soft); }
.privacy-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.privacy-tags span { border: 1px solid rgba(41,128,254,.18); background: rgba(41,128,254,.08); color: var(--blue); border-radius: 999px; padding: 6px 12px; font-weight: 800; font-size: 13px; }
.no-log-policy-section { display: grid; gap: 16px; }
.policy-card { background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 24px; box-shadow: 0 12px 30px rgba(27, 45, 90, .07); }
.device-grid { display: grid; gap: 14px; }
.device-card { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 18px; }
.tech-grid { display: grid; gap: 16px; margin-top: 18px; }
.tech-card { background: #F8FAFF; border: 1px solid #E6ECF7; border-radius: 18px; padding: 18px; }
.process-steps { display: grid; gap: 14px; }
.step-card { position: relative; background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 22px; box-shadow: 0 12px 28px rgba(27, 45, 90, .06); }
.step-card .num { width: 36px; height: 36px; display: grid; place-items: center; background: var(--blue); color: #fff; border-radius: 12px; font-weight: 900; margin-bottom: 12px; }
.risk-grid { display: grid; gap: 16px; }
.risk-card { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--blue); border-radius: 18px; padding: 20px; }
.risk-card h3, .faq-item h3 { font-size: 18px; margin-bottom: 8px; }
.faq-grid { display: grid; gap: 14px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 20px; }
.cta-section { padding: 58px 0; background: var(--gradient-main); color: #fff; text-align: center; }
.cta-section h2 { color: #fff; font-size: clamp(28px, 4vw, 44px); margin-bottom: 12px; }
.cta-section p { color: rgba(255,255,255,.86); max-width: 680px; margin: 0 auto 24px; }
.simple-hero { padding: 62px 0 36px; background: linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 100%); }
.simple-hero .content-container { display: grid; gap: 16px; }
.page-layout { padding: 34px 0 70px; }
.article-grid { display: grid; gap: 24px; }
.article-card, .side-card, .check-card { background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 26px; box-shadow: 0 12px 30px rgba(27, 45, 90, .06); }
.article-card h2, .side-card h2 { font-size: 24px; margin-bottom: 12px; }
.info-grid { display: grid; gap: 14px; margin: 20px 0; }
.info-card { background: #F8FAFF; border: 1px solid #E6ECF7; border-radius: 18px; padding: 18px; }
.download-steps { counter-reset: step; display: grid; gap: 14px; margin: 24px 0; }
.download-steps li { list-style: none; counter-increment: step; background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 18px 18px 18px 62px; position: relative; color: var(--muted); }
.download-steps li::before { content: counter(step); position: absolute; left: 18px; top: 18px; width: 30px; height: 30px; display: grid; place-items: center; background: var(--blue); color: #fff; border-radius: 10px; font-weight: 900; }
.site-footer { background: #101828; color: #fff; padding: 46px 0 22px; }
.footer-grid { display: grid; gap: 26px; }
.footer-brand { font-size: 24px; font-weight: 900; margin-bottom: 10px; }
.site-footer p { color: rgba(255,255,255,.68); }
.site-footer h3 { color: #fff; font-size: 16px; margin-bottom: 10px; }
.site-footer a { display: block; color: rgba(255,255,255,.70); margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 28px; padding-top: 18px; color: rgba(255,255,255,.58); font-size: 14px; }
@media (min-width: 680px) {
    .node-overview { grid-template-columns: repeat(2, 1fr); }
    .risk-grid, .faq-grid, .info-grid, .tech-grid, .device-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .no-log-policy-section { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 960px) {
    .mobile-nav-toggle { display: none; }
    .site-nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 2px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { font-size: 14px; }
    .hero-grid { grid-template-columns: 1.04fr .96fr; }
    .node-overview { grid-template-columns: repeat(4, 1fr); }
    .feature-split, .vpn-connection-section, .global-nodes-section, .high-speed-section, .privacy-protection-section, .multi-device-section, .encryption-protocol-section { grid-template-columns: 1fr 1fr; gap: 42px; }
    .article-grid { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .footer-grid { grid-template-columns: 1.4fr .8fr .8fr .8fr; }
    .section { padding: 88px 0; }
    .vpn-network-hero { padding: 94px 0 72px; }
}
@media (max-width: 420px) {
    .content-container { width: min(100% - 24px, 1120px); }
    .section, .page-layout { padding-left: 0; padding-right: 0; }
    .feature-panel, .article-card, .side-card, .privacy-panel, .safety-panel { padding: 22px; }
    .download-btn { width: 100%; }
    .status-card { font-size: 12px; padding: 8px 10px; }
}