:root {
    --brand-blue: #2980FE;
    --brand-blue-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #202938;
    --muted: #647084;
    --light: #F5F8FC;
    --line: #E3E9F2;
    --panel: #FFFFFF;
    --deep: #111827;
    --radius-lg: 28px;
    --radius-md: 20px;
    --shadow: 0 18px 50px rgba(36, 63, 126, 0.12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "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%; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(227,233,242,0.9);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 800; color: #1B2B4B; }
.logo { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 20px rgba(41,128,254,0.18); }
.site-nav { display: none; flex-direction: column; gap: 10px; position: absolute; left: 16px; right: 16px; top: 68px; background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 16px; box-shadow: var(--shadow); }
.site-nav a { color: #334155; font-size: 15px; padding: 8px 10px; border-radius: 12px; }
.site-nav a:hover { background: #F0F6FF; color: var(--brand-blue); }
.nav-link-strong { color: var(--brand-blue) !important; font-weight: 700; }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label { display: inline-flex; padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; color: #334155; font-weight: 700; cursor: pointer; }
.nav-toggle:checked ~ .site-nav { display: flex; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    background: var(--brand-blue);
    color: #fff;
    border-radius: 999px;
    font-weight: 800;
    letter-spacing: .02em;
    box-shadow: 0 14px 30px rgba(41,128,254,.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--brand-blue-dark); transform: translateY(-2px); box-shadow: 0 18px 38px rgba(23,104,232,.32); }
.section { padding: 72px 0; }
.section-light { background: var(--light); }
.section-title { margin: 0 0 14px; font-size: clamp(28px, 4vw, 42px); line-height: 1.2; letter-spacing: -0.03em; }
.section-desc { margin: 0 0 24px; color: var(--muted); max-width: 720px; }
.badge, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--brand-blue);
    background: #EEF6FF;
    border: 1px solid #D9E9FF;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 14px;
}
.link-more { color: var(--brand-blue); font-weight: 800; }
.link-more:hover { color: var(--brand-blue-dark); }
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    color: #fff;
    background: var(--gradient);
    padding: 72px 0 58px;
}
.vpn-network-hero::before,
.vpn-network-hero::after {
    content: "";
    position: absolute;
    inset: auto;
    border-radius: 999px;
    background: rgba(255,255,255,.18);
    filter: blur(8px);
}
.vpn-network-hero::before { width: 280px; height: 280px; top: -90px; right: 10%; }
.vpn-network-hero::after { width: 360px; height: 360px; bottom: -160px; left: -70px; }
.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, 8vw, 66px); line-height: 1.05; letter-spacing: -0.06em; }
.hero-copy p { margin: 0 0 24px; font-size: 17px; color: rgba(255,255,255,.88); max-width: 650px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.hero-tags span { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.25); font-weight: 700; font-size: 13px; }
.hero-visual { position: relative; min-height: 330px; border-radius: 32px; padding: 24px; background: rgba(255,255,255,.13); border: 1px solid rgba(255,255,255,.24); box-shadow: 0 30px 80px rgba(0,0,0,.18); }
.hero-visual::before { content: ""; position: absolute; inset: 18px; border-radius: 28px; background-image: radial-gradient(circle at 15% 25%, rgba(255,255,255,.45) 0 3px, transparent 4px), radial-gradient(circle at 70% 18%, rgba(255,255,255,.34) 0 3px, transparent 4px), radial-gradient(circle at 82% 72%, rgba(255,255,255,.28) 0 4px, transparent 5px), linear-gradient(125deg, transparent 0 38%, rgba(255,255,255,.22) 39%, transparent 41%); opacity: .8; }
.hero-visual img { position: relative; z-index: 1; width: min(420px, 88%); margin: 26px auto 0; border-radius: 26px; filter: drop-shadow(0 28px 36px rgba(20,30,80,.22)); }
.status-pill { position: absolute; z-index: 2; background: rgba(255,255,255,.92); color: #1E293B; border-radius: 999px; padding: 8px 12px; font-size: 13px; font-weight: 800; box-shadow: 0 14px 36px rgba(16,24,40,.16); }
.status-a { top: 22px; left: 20px; }
.status-b { top: 78px; right: 18px; }
.status-c { bottom: 72px; left: 22px; }
.status-d { bottom: 22px; right: 32px; }
.node-overview { margin-top: -28px; position: relative; z-index: 3; }
.node-grid { display: grid; gap: 16px; }
.node-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-md); padding: 22px; box-shadow: 0 14px 38px rgba(36,63,126,.08); }
.node-card .label { display: inline-block; color: var(--brand-blue); background: #EEF6FF; border-radius: 999px; padding: 4px 10px; font-size: 12px; font-weight: 800; margin-bottom: 10px; }
.node-card h3 { margin: 0 0 8px; font-size: 20px; }
.node-card p { margin: 0 0 12px; color: var(--muted); }
.feature-split, .vpn-connection-section, .high-speed-section, .privacy-protection-section, .multi-device-section { display: grid; gap: 28px; align-items: center; }
.feature-media { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 20px; box-shadow: var(--shadow); }
.feature-media img { border-radius: 22px; margin: 0 auto; }
.feature-list { display: grid; gap: 10px; margin: 18px 0 20px; padding: 0; list-style: none; }
.feature-list li { background: #F7FAFF; border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; color: #334155; }
.global-nodes-section { position: relative; overflow: hidden; border-radius: 34px; background: #F7FAFF; border: 1px solid var(--line); padding: 26px; }
.global-nodes-section::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(circle at 20% 30%, rgba(41,128,254,.18) 0 3px, transparent 4px), radial-gradient(circle at 65% 25%, rgba(123,78,241,.18) 0 3px, transparent 4px), radial-gradient(circle at 80% 72%, rgba(184,77,218,.16) 0 4px, transparent 5px), linear-gradient(115deg, transparent 0 42%, rgba(41,128,254,.1) 43%, transparent 45%); pointer-events: none; }
.global-inner { position: relative; display: grid; gap: 24px; align-items: center; }
.map-cards { display: grid; gap: 14px; }
.map-card { background: rgba(255,255,255,.88); border: 1px solid var(--line); border-radius: 18px; padding: 16px; }
.speed-panel { display: grid; gap: 14px; }
.speed-card { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 18px; box-shadow: 0 12px 28px rgba(36,63,126,.07); }
.speed-line { height: 8px; border-radius: 999px; background: linear-gradient(90deg, #DBEAFE, #2980FE); margin-top: 12px; }
.privacy-panel, .tech-panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px; box-shadow: var(--shadow); }
.privacy-tags, .tech-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.privacy-tags span, .tech-tags span { background: #EEF6FF; color: var(--brand-blue); border-radius: 999px; padding: 7px 11px; font-size: 13px; font-weight: 800; }
.no-log-policy-section { display: grid; gap: 16px; }
.policy-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-md); padding: 22px; }
.device-grid { display: grid; gap: 14px; margin-top: 16px; }
.device-card { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 16px; }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 22px; box-shadow: 0 12px 30px rgba(36,63,126,.06); }
.step-card .step-no { width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; border-radius: 50%; background: var(--brand-blue); color: #fff; font-weight: 900; margin-bottom: 10px; }
.risk-grid { display: grid; gap: 16px; }
.risk-card { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--brand-blue); border-radius: 18px; padding: 18px; }
.risk-card h3, .faq-item h3, .policy-card h3, .speed-card h3, .map-card h3 { margin: 0 0 8px; }
.risk-card p, .faq-item p, .policy-card p, .speed-card p, .map-card p { margin: 0 0 10px; color: var(--muted); }
.faq-list { display: grid; gap: 14px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 20px; }
.cta-section { padding: 64px 0; background: var(--gradient); color: #fff; text-align: center; }
.cta-box { max-width: 760px; margin: 0 auto; }
.cta-box h2 { margin: 0 0 12px; font-size: clamp(28px, 5vw, 44px); line-height: 1.2; }
.cta-box p { color: rgba(255,255,255,.88); margin: 0 0 24px; }
.page-hero { background: linear-gradient(180deg, #F5F8FF 0%, #FFFFFF 100%); padding: 56px 0 28px; }
.page-hero-inner { max-width: 850px; }
.page-hero h1 { margin: 0 0 14px; font-size: clamp(34px, 6vw, 54px); line-height: 1.12; letter-spacing: -0.05em; }
.page-hero p { margin: 0; color: var(--muted); font-size: 17px; }
.page-shell { padding: 36px 0 72px; }
.content-grid { display: grid; gap: 24px; }
.article-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px; box-shadow: 0 14px 34px rgba(36,63,126,.06); }
.article-card h2 { margin: 0 0 12px; font-size: 26px; }
.article-card p { color: #465366; margin: 0 0 14px; }
.side-panel { background: #F7FAFF; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 22px; align-self: start; }
.side-panel h2, .side-panel h3 { margin-top: 0; }
.check-list, .plain-list { display: grid; gap: 10px; padding: 0; margin: 16px 0 0; list-style: none; }
.check-list li, .plain-list li { padding: 12px 14px; border-radius: 14px; background: #fff; border: 1px solid var(--line); color: #334155; }
.notice { background: #F0F6FF; border: 1px solid #D9E9FF; border-radius: 20px; padding: 18px; color: #334155; }
.download-panel { text-align: center; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow); }
.install-steps { display: grid; gap: 14px; margin-top: 20px; }
.install-step { background: #F7FAFF; border: 1px solid var(--line); border-radius: 18px; padding: 18px; }
.site-footer { background: #111827; color: #D8DEE9; padding: 52px 0 24px; }
.footer-grid { display: grid; gap: 26px; }
.footer-brand { color: #fff; font-size: 24px; font-weight: 900; margin-bottom: 8px; }
.site-footer h3 { color: #fff; margin: 0 0 12px; }
.site-footer p { margin: 0; color: #AAB4C3; }
.site-footer a { display: block; color: #C9D4E5; margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 32px; padding-top: 18px; color: #93A0B4; font-size: 14px; }
@media (min-width: 680px) {
    .node-grid { grid-template-columns: repeat(2, 1fr); }
    .no-log-policy-section { grid-template-columns: repeat(3, 1fr); }
    .device-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.3fr 1fr 1fr 1.1fr; }
}
@media (min-width: 920px) {
    .site-nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 4px; padding: 0; box-shadow: none; border: 0; background: transparent; }
    .nav-toggle-label { display: none; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; }
    .node-grid { grid-template-columns: repeat(4, 1fr); }
    .feature-split, .vpn-connection-section, .high-speed-section, .privacy-protection-section, .multi-device-section { grid-template-columns: 1fr 1fr; }
    .global-inner { grid-template-columns: 1fr .9fr; }
    .content-grid { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 520px) {
    .container { width: min(100% - 24px, 1120px); }
    .section { padding: 54px 0; }
    .vpn-network-hero { padding-top: 52px; }
    .hero-visual { min-height: 280px; padding: 14px; }
    .status-pill { font-size: 12px; padding: 7px 10px; }
    .download-btn { width: 100%; min-height: 52px; }
    .article-card, .side-panel, .download-panel { padding: 20px; border-radius: 22px; }
}