:root {
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #1f2937;
    --muted: #667085;
    --light: #f6f8fc;
    --line: #e6ebf3;
    --white: #ffffff;
    --shadow: 0 18px 50px rgba(39, 78, 169, .10);
    --radius-lg: 28px;
    --radius-md: 20px;
}
* { 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: 1.7;
    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.light { background: var(--light); }
.section-title { max-width: 760px; margin-bottom: 28px; }
.section-title.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-title .eyebrow, .page-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 12px;
    border-radius: 999px;
    background: rgba(41,128,254,.10);
    color: var(--blue);
    font-weight: 700;
    font-size: 13px;
    margin-bottom: 12px;
}
h1, h2, h3 { margin: 0 0 14px; line-height: 1.2; color: #111827; }
h1 { font-size: clamp(34px, 8vw, 62px); letter-spacing: -1.8px; }
h2 { font-size: clamp(26px, 5vw, 42px); letter-spacing: -1px; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
ul, ol { margin: 0; padding-left: 20px; color: var(--muted); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
}
.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo, .footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #111827;
    font-size: 20px;
}
.logo img, .footer-logo img {
    width: 42px;
    height: 42px;
    border-radius: 13px;
    object-fit: cover;
    box-shadow: 0 8px 22px rgba(41,128,254,.18);
}
.main-nav { display: none; align-items: center; gap: 8px; flex-wrap: wrap; }
.main-nav a {
    padding: 8px 11px;
    border-radius: 999px;
    color: #344054;
    font-size: 14px;
    font-weight: 650;
}
.main-nav a:hover, .main-nav a.active { background: rgba(41,128,254,.10); color: var(--blue); }
.nav-toggle {
    display: inline-flex;
    width: 42px;
    height: 42px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    color: #111827;
    font-size: 22px;
}
.main-nav.show {
    display: grid;
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff !important;
    font-weight: 800;
    letter-spacing: .2px;
    box-shadow: 0 14px 28px rgba(41,128,254,.25);
    transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 18px 34px rgba(23,104,232,.28); }
.learn-link { color: var(--blue); font-weight: 800; display: inline-flex; align-items: center; gap: 6px; }
.learn-link::after { content: "›"; font-size: 20px; }
.vpn-network-hero {
    position: relative;
    color: #fff;
    background: var(--gradient);
    overflow: hidden;
    padding: 78px 0 64px;
}
.vpn-network-hero::before, .vpn-network-hero::after {
    content: "";
    position: absolute;
    inset: auto;
    pointer-events: none;
    border-radius: 999px;
    filter: blur(2px);
}
.vpn-network-hero::before {
    width: 520px;
    height: 520px;
    right: -160px;
    top: -160px;
    background: rgba(255,255,255,.18);
}
.vpn-network-hero::after {
    width: 660px;
    height: 180px;
    left: 8%;
    bottom: 30px;
    background: radial-gradient(circle, rgba(255,255,255,.38) 1px, transparent 2px);
    background-size: 46px 28px;
    opacity: .6;
}
.hero-grid { position: relative; z-index: 1; display: grid; gap: 34px; align-items: center; }
.hero-copy h1, .hero-copy p { color: #fff; }
.hero-copy p { font-size: 18px; opacity: .92; max-width: 650px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 28px; }
.hero-tags span, .status-card, .network-pill {
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(255,255,255,.34);
    background: rgba(255,255,255,.14);
    color: #fff;
    border-radius: 999px;
    padding: 8px 12px;
    font-weight: 700;
    font-size: 13px;
    backdrop-filter: blur(10px);
}
.hero-visual { position: relative; min-height: 320px; }
.hero-device {
    position: relative;
    width: min(420px, 86vw);
    margin: 0 auto;
    border-radius: 34px;
    padding: 18px;
    background: rgba(255,255,255,.18);
    border: 1px solid rgba(255,255,255,.26);
    box-shadow: 0 30px 90px rgba(20,30,70,.24);
}
.hero-device img { border-radius: 26px; }
.status-card { position: absolute; background: rgba(255,255,255,.92); color: #1f2937; border-color: rgba(255,255,255,.6); box-shadow: 0 18px 40px rgba(18,27,70,.18); }
.status-card.one { left: 0; top: 24px; }
.status-card.two { right: 0; top: 92px; }
.status-card.three { left: 8%; bottom: 54px; }
.status-card.four { right: 7%; bottom: 10px; }
.node-overview {
    margin-top: -36px;
    position: relative;
    z-index: 3;
    display: grid;
    gap: 16px;
}
.node-card, .feature-card, .info-card, .risk-card, .faq-item, .step-card, .content-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 34px rgba(30,58,138,.06);
}
.node-card { padding: 22px; }
.node-card span, .feature-tag { color: var(--blue); font-weight: 800; font-size: 13px; }
.two-col { display: grid; gap: 30px; align-items: center; }
.visual-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 16px;
    box-shadow: var(--shadow);
}
.visual-card img { border-radius: 22px; width: 100%; }
.feature-list { display: grid; gap: 12px; margin: 22px 0; }
.feature-list li { list-style: none; padding: 14px 16px; border-left: 4px solid var(--blue); background: var(--light); border-radius: 16px; color: #344054; }
.global-nodes-section {
    background: linear-gradient(180deg, #f7f9ff 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
}
.global-nodes-section .map-panel {
    position: relative;
    min-height: 360px;
    border-radius: var(--radius-lg);
    background: var(--gradient);
    padding: 18px;
    box-shadow: var(--shadow);
    overflow: hidden;
}
.map-panel::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,.7) 0 3px, transparent 4px), radial-gradient(circle at 70% 40%, rgba(255,255,255,.7) 0 3px, transparent 4px), radial-gradient(circle at 48% 72%, rgba(255,255,255,.7) 0 3px, transparent 4px), linear-gradient(115deg, transparent 20%, rgba(255,255,255,.2) 22%, transparent 24%, transparent 56%, rgba(255,255,255,.18) 58%, transparent 61%);
    opacity: .8;
}
.map-panel img { position: relative; z-index: 1; margin: 0 auto; border-radius: 24px; max-height: 340px; object-fit: cover; }
.node-note { position: relative; z-index: 2; margin-top: 14px; color: #fff; display: flex; flex-wrap: wrap; gap: 10px; }
.high-speed-section { background: #f5f8ff; }
.speed-lines { display: grid; gap: 12px; margin-top: 18px; }
.speed-line { padding: 14px; border-radius: 16px; background: #fff; border: 1px solid var(--line); }
.speed-line b { color: #111827; }
.privacy-protection-section .privacy-panel {
    padding: 22px;
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, #fff 0%, #f6f9ff 100%);
    border: 1px solid var(--line);
}
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.security-tags span { padding: 8px 12px; border-radius: 999px; color: var(--blue); background: rgba(41,128,254,.10); font-weight: 800; font-size: 13px; }
.no-log-policy-section .card-grid, .card-grid { display: grid; gap: 16px; }
.feature-card, .info-card { padding: 22px; }
.multi-device-section .device-grid { display: grid; gap: 16px; }
.device-card { padding: 18px; border-radius: 20px; background: #fff; border: 1px solid var(--line); }
.encryption-protocol-section { background: linear-gradient(180deg, #ffffff 0%, #f6f8fc 100%); }
.tech-panel { display: grid; gap: 16px; }
.tech-line { padding: 18px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.process-steps { display: grid; gap: 16px; }
.step-card { padding: 20px; position: relative; }
.step-number { width: 38px; height: 38px; border-radius: 14px; background: var(--blue); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-weight: 900; margin-bottom: 12px; }
.risk-grid { display: grid; gap: 16px; }
.risk-card { padding: 20px; border-left: 4px solid var(--blue); }
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 20px; }
.faq-item h3 { font-size: 18px; }
.cta-section {
    background: var(--gradient);
    color: #fff;
    text-align: center;
    padding: 64px 0;
}
.cta-section h2, .cta-section p { color: #fff; }
.cta-section p { max-width: 720px; margin: 0 auto 24px; opacity: .9; }
.page-hero { padding: 54px 0 34px; background: linear-gradient(180deg, #f5f8ff 0%, #fff 100%); }
.page-hero .container { max-width: 930px; }
.page-hero h1 { font-size: clamp(32px, 7vw, 52px); }
.page-layout { display: grid; gap: 28px; align-items: start; }
.article-content { display: grid; gap: 22px; }
.article-content .content-card { padding: 24px; }
.side-panel { display: grid; gap: 16px; }
.notice-box { padding: 18px; border-radius: 20px; border: 1px solid rgba(41,128,254,.20); background: rgba(41,128,254,.07); color: #344054; }
.check-list { display: grid; gap: 12px; padding: 0; }
.check-list li { list-style: none; padding: 13px 14px; border-radius: 14px; background: var(--light); color: #344054; }
.download-page-card { text-align: center; padding: 32px; }
.install-steps { counter-reset: steps; display: grid; gap: 14px; }
.install-steps li { list-style: none; counter-increment: steps; padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
.install-steps li::before { content: counter(steps); display: inline-flex; width: 30px; height: 30px; align-items: center; justify-content: center; border-radius: 10px; background: var(--blue); color: #fff; font-weight: 900; margin-right: 8px; }
.site-footer { background: #111827; color: #d0d5dd; padding: 54px 0 20px; }
.site-footer p, .site-footer a, .footer-bottom { color: #aeb7c6; }
.footer-grid { display: grid; gap: 28px; }
.site-footer h3 { color: #fff; font-size: 16px; }
.site-footer a { display: block; margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-logo { color: #fff; margin-bottom: 14px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 34px; padding-top: 18px; display: flex; flex-direction: column; gap: 8px; font-size: 13px; }
@media (min-width: 640px) {
    .node-overview, .card-grid, .risk-grid, .process-steps, .multi-device-section .device-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 920px) {
    .nav-toggle { display: none; }
    .main-nav { display: flex; }
    .hero-grid { grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); }
    .two-col { grid-template-columns: 1fr 1fr; }
    .two-col.reverse .visual-card { order: -1; }
    .node-overview { grid-template-columns: repeat(4, 1fr); }
    .no-log-policy-section .card-grid, .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; align-items: center; }
    .section { padding: 86px 0; }
}
@media (max-width: 480px) {
    .container { width: min(100% - 24px, 1120px); }
    .vpn-network-hero { padding: 54px 0 50px; }
    .hero-visual { min-height: 280px; }
    .status-card { font-size: 12px; padding: 7px 10px; }
    .download-btn { width: 100%; min-height: 52px; }
    .page-hero { padding-top: 42px; }
}