:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --line: #e5eaf3;
    --white: #ffffff;
    --deep: #111827;
    --radius: 24px;
    --shadow: 0 18px 45px rgba(25, 48, 92, 0.10);
}
* { 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: #ffffff;
    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; }
.container.narrow { width: min(880px, calc(100% - 32px)); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(229,234,243,.9);
}
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--deep); letter-spacing: -.02em; }
.logo img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 20px rgba(41,128,254,.18); }
.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--deep);
    border-radius: 999px;
    padding: 8px 14px;
    font-weight: 700;
}
.site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 72px; padding: 12px; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: var(--shadow); }
.site-nav.open { display: grid; gap: 4px; }
.site-nav a { padding: 10px 12px; border-radius: 12px; color: #475467; font-size: 15px; }
.site-nav a:hover, .site-nav a.active { background: #eef5ff; color: var(--blue); }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(41,128,254,.26);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: #1768E8; transform: translateY(-2px); box-shadow: 0 18px 34px rgba(23,104,232,.30); }
.text-link { color: var(--blue); font-weight: 800; }
.pill-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.pill { display: inline-flex; align-items: center; gap: 8px; padding: 7px 12px; border-radius: 999px; background: rgba(255,255,255,.18); color: #fff; border: 1px solid rgba(255,255,255,.24); font-size: 13px; }
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    color: #fff;
    background: var(--gradient);
    padding: 56px 0 72px;
}
.vpn-network-hero:before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 18% 18%, rgba(255,255,255,.24), transparent 22%),
        radial-gradient(circle at 78% 35%, rgba(255,255,255,.18), transparent 18%),
        linear-gradient(115deg, transparent 0 24%, rgba(255,255,255,.13) 24.3% 24.8%, transparent 25.1% 48%, rgba(255,255,255,.12) 48.3% 48.8%, transparent 49%);
    opacity: .9;
}
.hero-grid { position: relative; z-index: 1; display: grid; gap: 34px; align-items: center; }
.hero-copy h1 { margin: 0 0 18px; font-size: clamp(36px, 9vw, 64px); line-height: 1.08; letter-spacing: -.05em; }
.hero-copy p { max-width: 610px; margin: 0 0 24px; color: rgba(255,255,255,.86); font-size: 17px; }
.hero-visual { position: relative; }
.product-panel { position: relative; padding: 22px; border-radius: 32px; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.26); box-shadow: 0 24px 60px rgba(8,22,60,.22); }
.product-panel img { width: 100%; max-height: 420px; object-fit: contain; filter: drop-shadow(0 25px 45px rgba(18,24,60,.22)); }
.status-card { position: static; display: inline-flex; align-items: center; gap: 8px; margin: 8px 8px 0 0; padding: 9px 12px; border-radius: 999px; background: rgba(255,255,255,.92); color: #2b3445; font-size: 13px; font-weight: 800; box-shadow: 0 12px 28px rgba(16,24,40,.14); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #31d27c; box-shadow: 0 0 0 5px rgba(49,210,124,.16); }
.section { padding: 68px 0; }
.section.alt, .high-speed-section { background: #f6f9ff; }
.section-head { display: grid; gap: 10px; margin-bottom: 28px; }
.section-eyebrow, .category-badge { display: inline-flex; width: fit-content; align-items: center; padding: 6px 11px; border-radius: 999px; color: var(--blue); background: #eef5ff; font-weight: 800; font-size: 13px; }
.section h2, .article-card h2 { margin: 0; color: var(--deep); font-size: clamp(26px, 5vw, 42px); line-height: 1.18; letter-spacing: -.03em; }
.section-head p { margin: 0; color: var(--muted); max-width: 760px; }
.node-overview { margin-top: -38px; position: relative; z-index: 3; }
.node-overview-grid { display: grid; gap: 16px; }
.node-card { background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 20px; box-shadow: 0 16px 42px rgba(25,48,92,.08); }
.node-card .tag { display: inline-block; color: #2980FE; background: #eef5ff; border-radius: 999px; padding: 4px 10px; font-size: 12px; font-weight: 800; margin-bottom: 10px; }
.node-card h3 { margin: 0 0 8px; font-size: 19px; color: var(--deep); }
.node-card p { margin: 0 0 14px; color: var(--muted); font-size: 15px; }
.node-card a { color: var(--blue); font-weight: 800; }
.vpn-connection-section, .global-nodes-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: 30px; padding: 24px; box-shadow: var(--shadow); }
.feature-panel img { border-radius: 22px; margin: 0 auto; }
.feature-list { display: grid; gap: 12px; margin: 22px 0; padding: 0; list-style: none; }
.feature-list li { position: relative; padding-left: 26px; color: #475467; }
.feature-list li:before { content: ""; position: absolute; left: 0; top: .75em; width: 9px; height: 9px; border-radius: 50%; background: #2980FE; }
.global-nodes-section { position: relative; border-radius: 34px; padding: 28px; background: radial-gradient(circle at 15% 25%, rgba(41,128,254,.12), transparent 26%), radial-gradient(circle at 80% 45%, rgba(123,78,241,.12), transparent 24%), #fff; border: 1px solid var(--line); overflow: hidden; }
.global-nodes-section:before { content: ""; position: absolute; inset: 24px; border-radius: 28px; background-image: linear-gradient(90deg, rgba(41,128,254,.08) 1px, transparent 1px), linear-gradient(rgba(41,128,254,.08) 1px, transparent 1px); background-size: 42px 42px; pointer-events: none; }
.global-nodes-section > * { position: relative; z-index: 1; }
.speed-grid { display: grid; gap: 18px; }
.speed-card { background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 20px; }
.speed-card strong { color: var(--deep); display: block; margin-bottom: 8px; }
.speed-line { height: 8px; border-radius: 99px; background: linear-gradient(90deg, #2980FE, #7B4EF1); margin: 12px 0; }
.privacy-box { display: grid; gap: 14px; }
.boundary-card, .protocol-card, .risk-card, .faq-item, .process-card, .mini-card { background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 20px; }
.boundary-card h3, .protocol-card h3, .risk-card h3, .faq-item h3, .process-card h3, .mini-card h3 { margin: 0 0 8px; color: var(--deep); }
.boundary-card p, .protocol-card p, .risk-card p, .faq-item p, .process-card p, .mini-card p { margin: 0; color: var(--muted); }
.no-log-policy-section .card-grid, .risk-grid, .faq-grid { display: grid; gap: 16px; }
.device-grid, .protocol-grid { display: grid; gap: 16px; }
.protocol-card { background: linear-gradient(180deg, #fff, #f8fbff); }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.process-card { position: relative; padding-left: 76px; }
.process-card:before { counter-increment: step; content: counter(step, decimal-leading-zero); position: absolute; left: 20px; top: 20px; width: 40px; height: 40px; display: grid; place-items: center; border-radius: 14px; color: #fff; font-weight: 900; background: #2980FE; }
.risk-card { border-left: 4px solid #2980FE; }
.cta-section { color: #fff; background: var(--gradient); border-radius: 34px; padding: 42px 24px; text-align: center; overflow: hidden; position: relative; }
.cta-section:before { content:""; position:absolute; inset:0; background: radial-gradient(circle at 18% 0%, rgba(255,255,255,.22), transparent 28%), radial-gradient(circle at 80% 60%, rgba(255,255,255,.15), transparent 26%); }
.cta-section > * { position: relative; z-index: 1; }
.cta-section h2 { margin: 0 0 12px; font-size: clamp(28px, 6vw, 44px); line-height: 1.15; }
.cta-section p { max-width: 680px; margin: 0 auto 22px; color: rgba(255,255,255,.86); }
.subpage-hero { padding: 54px 0; background: linear-gradient(180deg, #f5f8ff 0%, #fff 100%); }
.subpage-hero h1 { margin: 14px 0 12px; color: var(--deep); font-size: clamp(32px, 7vw, 54px); line-height: 1.12; letter-spacing: -.04em; }
.subpage-hero p { margin: 0; color: var(--muted); font-size: 17px; max-width: 760px; }
.content-layout { display: grid; gap: 22px; align-items: start; padding: 30px 0 72px; }
.article-card { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.article-card p { color: #475467; margin: 14px 0; }
.article-card .download-btn { margin-top: 18px; }
.side-panel { display: grid; gap: 14px; }
.info-strip { display: grid; gap: 12px; padding: 18px; border-radius: 22px; background: #f6f9ff; border: 1px solid var(--line); }
.checklist, .step-list { display: grid; gap: 12px; margin: 20px 0; padding: 0; list-style: none; }
.checklist li, .step-list li { padding: 14px 16px; background: #f8fbff; border: 1px solid var(--line); border-radius: 16px; color: #475467; }
.step-list { counter-reset: listStep; }
.step-list li:before { counter-increment: listStep; content: counter(listStep) ". "; color: #2980FE; font-weight: 900; }
.faq-page { display: grid; gap: 16px; }
.site-footer { background: #111827; color: #d0d5dd; padding: 48px 0 24px; }
.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 12px; }
.site-footer a { display: block; color: #d0d5dd; margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); color: #98a2b3; font-size: 14px; }
@media (min-width: 640px) {
    .node-overview-grid, .no-log-policy-section .card-grid, .device-grid, .protocol-grid, .risk-grid, .faq-grid, .speed-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
}
@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .site-nav { display: flex; position: static; padding: 0; border: 0; box-shadow: none; background: transparent; align-items: center; gap: 2px; }
    .site-nav a { font-size: 14px; }
    .hero-grid, .vpn-connection-section, .privacy-protection-section, .multi-device-section { grid-template-columns: 1.02fr .98fr; }
    .global-nodes-section, .encryption-protocol-section { grid-template-columns: .95fr 1.05fr; }
    .node-overview-grid { grid-template-columns: repeat(4, 1fr); }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .content-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .status-card.one { position: absolute; left: -16px; top: 28px; }
    .status-card.two { position: absolute; right: -10px; top: 88px; }
    .status-card.three { position: absolute; left: 24px; bottom: 34px; }
    .status-card.four { position: absolute; right: 18px; bottom: 24px; }
    .section { padding: 86px 0; }
}
@media (min-width: 1080px) {
    .site-nav a { padding: 10px 13px; }
    .product-panel { padding: 30px; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1120px); }
    .download-btn { width: 100%; }
    .article-card, .feature-panel, .global-nodes-section { padding: 18px; border-radius: 22px; }
    .process-card { padding-left: 20px; padding-top: 74px; }
}