:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --soft: #f5f7fb;
    --line: #e5e9f2;
    --panel: #ffffff;
    --deep: #111827;
    --shadow: 0 18px 45px 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", "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; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, .94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(229, 233, 242, .9);
}
.nav-shell {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -.02em;
    color: var(--deep);
}
.brand img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
    border: 1px solid var(--line);
}
.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 68px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    border-radius: 18px;
}
.site-nav a {
    display: block;
    padding: 12px 14px;
    color: #344054;
    border-radius: 12px;
    font-size: 15px;
}
.site-nav a:hover, .site-nav a.active { background: #eef5ff; color: var(--blue); }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label {
    display: inline-flex;
    flex-direction: column;
    gap: 5px;
    width: 42px;
    height: 42px;
    justify-content: center;
    align-items: center;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
}
.nav-toggle-label span { width: 19px; height: 2px; background: #1f2937; border-radius: 999px; }
.nav-toggle:checked ~ .site-nav { display: block; }
.container, .section-container {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
}
.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;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(41, 128, 254, .24);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    border: 0;
    line-height: 1.2;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 18px 32px rgba(41, 128, 254, .28); }
.section-eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: #eef5ff;
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
}
.section-title { font-size: clamp(26px, 4vw, 42px); line-height: 1.18; margin: 12px 0 16px; color: var(--deep); letter-spacing: -.04em; }
.section-lead { color: var(--muted); font-size: 16px; margin: 0 0 22px; }
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    background: var(--gradient);
    color: #fff;
    padding: 58px 0 46px;
}
.vpn-network-hero:before, .vpn-network-hero:after {
    content: "";
    position: absolute;
    inset: auto auto 14% -10%;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .14);
    filter: blur(12px);
}
.vpn-network-hero:after {
    left: auto;
    right: -8%;
    top: 10%;
    width: 280px;
    height: 280px;
    background: rgba(255, 255, 255, .10);
}
.hero-grid {
    position: relative;
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-copy h1 {
    font-size: clamp(38px, 8vw, 68px);
    line-height: 1.04;
    letter-spacing: -.06em;
    margin: 12px 0 18px;
}
.hero-copy p { color: rgba(255,255,255,.86); margin: 0 0 24px; font-size: 17px; }
.hero-kicker {
    display: inline-flex;
    padding: 7px 12px;
    background: rgba(255, 255, 255, .16);
    border: 1px solid rgba(255, 255, 255, .28);
    border-radius: 999px;
    font-weight: 800;
}
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.hero-tags span, .status-pill {
    display: inline-flex;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, .15);
    border: 1px solid rgba(255, 255, 255, .24);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
}
.hero-visual {
    position: relative;
    min-height: 370px;
    padding: 20px;
    border-radius: 30px;
    background:
        radial-gradient(circle at 30% 25%, rgba(255,255,255,.22), transparent 28%),
        linear-gradient(135deg, rgba(255,255,255,.20), rgba(255,255,255,.06));
    border: 1px solid rgba(255,255,255,.26);
    box-shadow: 0 28px 70px rgba(20, 25, 70, .22);
}
.hero-visual:before {
    content: "";
    position: absolute;
    inset: 18px;
    border-radius: 26px;
    background-image:
        linear-gradient(rgba(255,255,255,.20) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.20) 1px, transparent 1px);
    background-size: 42px 42px;
    opacity: .35;
}
.hero-visual img {
    position: relative;
    width: min(330px, 78vw);
    margin: 34px auto 0;
    filter: drop-shadow(0 30px 38px rgba(15, 23, 42, .25));
}
.float-card {
    position: absolute;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 13px;
    border-radius: 16px;
    background: rgba(255, 255, 255, .90);
    color: #1f2937;
    box-shadow: 0 18px 35px rgba(15, 23, 42, .14);
    font-weight: 800;
    font-size: 13px;
}
.float-card:before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #19c37d;
    box-shadow: 0 0 0 5px rgba(25, 195, 125, .12);
}
.float-card.one { top: 26px; left: 18px; }
.float-card.two { top: 84px; right: 16px; }
.float-card.three { bottom: 76px; left: 14px; }
.float-card.four { bottom: 24px; right: 24px; }
.node-overview { margin-top: -26px; position: relative; z-index: 4; }
.node-overview-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}
.node-card, .info-card, .risk-card, .faq-item, .step-card, .policy-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 14px 35px rgba(31, 41, 55, .06);
}
.node-card { padding: 22px; }
.node-card .tag { color: var(--blue); font-size: 13px; font-weight: 900; }
.node-card h3, .info-card h3, .risk-card h3, .step-card h3, .policy-card h3 { margin: 8px 0 8px; color: var(--deep); line-height: 1.28; }
.node-card p, .info-card p, .risk-card p, .step-card p, .policy-card p { color: var(--muted); margin: 0 0 12px; }
.text-link { color: var(--blue); font-weight: 800; }
.text-link:hover { text-decoration: underline; }
.feature-section { padding: 74px 0; }
.feature-grid, .split-grid, .privacy-grid, .device-grid, .protocol-grid, .page-grid, .about-grid {
    display: grid;
    gap: 26px;
    align-items: center;
}
.visual-card {
    position: relative;
    overflow: hidden;
    border-radius: 30px;
    background: #f3f6ff;
    border: 1px solid var(--line);
    padding: 26px;
    min-height: 280px;
}
.visual-card:before {
    content: "";
    position: absolute;
    inset: -20% -10% auto auto;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(53,88,242,.20), rgba(184,77,218,.16));
}
.visual-card img { position: relative; margin: 0 auto; max-height: 340px; object-fit: contain; }
.check-list { display: grid; gap: 10px; margin: 18px 0 20px; padding: 0; list-style: none; }
.check-list li {
    position: relative;
    padding-left: 28px;
    color: #344054;
}
.check-list li:before {
    content: "";
    position: absolute;
    left: 0;
    top: .62em;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 5px rgba(41,128,254,.12);
}
.global-nodes-section {
    background: #f7f9fd;
    position: relative;
}
.map-panel {
    border-radius: 32px;
    padding: 26px;
    background:
        radial-gradient(circle at 20% 30%, rgba(41,128,254,.14), transparent 24%),
        radial-gradient(circle at 78% 20%, rgba(123,78,241,.14), transparent 24%),
        linear-gradient(180deg, #fff, #f2f6ff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.node-lines {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}
.node-line {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    background: rgba(255,255,255,.88);
    border: 1px solid var(--line);
    border-radius: 16px;
    color: #344054;
}
.high-speed-section { background: #f4f7fb; }
.speed-card-grid { display: grid; gap: 14px; margin-top: 18px; }
.speed-card {
    padding: 18px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}
.speed-meter {
    height: 8px;
    border-radius: 999px;
    background: #e8eef7;
    overflow: hidden;
    margin-top: 10px;
}
.speed-meter span { display: block; height: 100%; background: var(--blue); border-radius: 999px; }
.privacy-protection-section { background: #fff; }
.safety-panel {
    padding: 26px;
    border-radius: 30px;
    background: linear-gradient(180deg, #f8fbff, #fff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.safety-panel .panel-row {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
}
.safety-panel .panel-row:last-child { border-bottom: 0; }
.panel-dot {
    flex: 0 0 30px;
    height: 30px;
    border-radius: 50%;
    background: #eef5ff;
    position: relative;
}
.panel-dot:after {
    content: "";
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--blue);
    top: 10px;
    left: 10px;
}
.no-log-policy-section { background: #f7f9fd; }
.policy-grid { display: grid; gap: 14px; margin-top: 26px; }
.policy-card { padding: 20px; }
.multi-device-section { background: #fff; }
.device-stack { display: grid; grid-template-columns: 1fr; gap: 14px; }
.device-item {
    padding: 18px;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: 0 14px 30px rgba(31, 41, 55, .06);
}
.encryption-protocol-section { background: #f5f7fb; }
.protocol-panel {
    padding: 24px;
    border-radius: 28px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.protocol-list { display: grid; gap: 12px; margin-top: 18px; }
.protocol-item {
    padding: 16px;
    border-radius: 18px;
    background: #f8fbff;
    border-left: 4px solid var(--blue);
}
.process-section { padding: 74px 0; background: #fff; }
.process-steps { display: grid; gap: 14px; margin-top: 26px; }
.step-card { padding: 20px; position: relative; overflow: hidden; }
.step-num {
    width: 38px;
    height: 38px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #eef5ff;
    color: var(--blue);
    font-weight: 900;
}
.risk-section { padding: 74px 0; background: #f7f9fd; }
.risk-grid { display: grid; gap: 14px; margin-top: 26px; }
.risk-card { padding: 18px; border-left: 4px solid var(--blue); }
.faq-section { padding: 74px 0; background: #fff; }
.faq-list { display: grid; gap: 14px; margin-top: 22px; }
.faq-item { padding: 20px; }
.faq-item h3 { margin: 0 0 8px; line-height: 1.35; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section {
    padding: 72px 0;
    background: var(--gradient);
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.cta-box {
    width: min(820px, calc(100% - 32px));
    margin: 0 auto;
    position: relative;
}
.cta-box h2 { font-size: clamp(28px, 5vw, 44px); line-height: 1.15; margin: 0 0 14px; letter-spacing: -.04em; }
.cta-box p { color: rgba(255,255,255,.86); margin: 0 auto 24px; max-width: 680px; }
.page-hero {
    padding: 56px 0 36px;
    background: linear-gradient(180deg, #f7f9ff, #fff);
    border-bottom: 1px solid var(--line);
}
.page-hero h1 { font-size: clamp(32px, 6vw, 54px); line-height: 1.12; margin: 14px 0; letter-spacing: -.05em; color: var(--deep); }
.page-hero p { color: var(--muted); max-width: 780px; margin: 0; }
.content-section { padding: 58px 0 76px; }
.article-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: 0 16px 38px rgba(31, 41, 55, .06);
}
.article-panel h2 { margin-top: 0; color: var(--deep); }
.article-panel p { color: #4b5563; }
.side-panel {
    background: #f7f9fd;
    border: 1px solid var(--line);
    border-radius: 26px;
    padding: 22px;
}
.side-panel h3 { margin-top: 0; }
.note-box {
    padding: 18px;
    border-radius: 20px;
    background: #eef5ff;
    color: #344054;
    border: 1px solid #d6e7ff;
    margin: 18px 0;
}
.feature-list, .number-list { padding-left: 20px; color: #4b5563; }
.feature-list li, .number-list li { margin: 8px 0; }
.download-area { margin-top: 22px; }
.download-page-card {
    padding: 28px;
    border-radius: 30px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.download-steps { counter-reset: step; display: grid; gap: 14px; margin: 22px 0; }
.download-step {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 14px;
    align-items: start;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #f8fbff;
}
.download-step span {
    width: 38px;
    height: 38px;
    border-radius: 14px;
    background: var(--blue);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
}
.about-grid { align-items: start; }
.about-card {
    padding: 22px;
    border-radius: 24px;
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: 0 14px 30px rgba(31, 41, 55, .06);
}
.site-footer { background: #101828; color: #d0d5dd; padding: 54px 0 24px; }
.footer-grid {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 28px;
}
.footer-grid h3 { color: #fff; margin: 0 0 12px; }
.footer-grid a { display: block; color: #d0d5dd; padding: 5px 0; }
.footer-grid a:hover { color: #fff; }
.footer-brand p { max-width: 360px; color: #98a2b3; }
.footer-logo { color: #fff; }
.footer-bottom {
    width: min(1160px, calc(100% - 32px));
    margin: 30px auto 0;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,.12);
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: #98a2b3;
    font-size: 14px;
}
@media (min-width: 700px) {
    .node-overview-grid { grid-template-columns: repeat(2, 1fr); }
    .policy-grid, .risk-grid, .process-steps, .speed-card-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}
@media (min-width: 980px) {
    .nav-toggle-label { display: none; }
    .site-nav {
        display: flex;
        position: static;
        padding: 0;
        border: 0;
        box-shadow: none;
        border-radius: 0;
        background: transparent;
        align-items: center;
        gap: 4px;
    }
    .site-nav a { padding: 9px 12px; font-size: 14px; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; }
    .vpn-network-hero { padding: 78px 0 72px; }
    .node-overview-grid { grid-template-columns: repeat(4, 1fr); }
    .feature-grid, .split-grid, .privacy-grid, .device-grid, .protocol-grid, .about-grid { grid-template-columns: 1fr 1fr; }
    .page-grid { grid-template-columns: minmax(0, 1.6fr) minmax(280px, .7fr); align-items: start; }
    .policy-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .content-section { padding-top: 72px; }
    .article-panel { padding: 34px; }
}
@media (max-width: 420px) {
    .container, .section-container, .nav-shell { width: min(100% - 24px, 1160px); }
    .download-btn { width: 100%; padding-left: 18px; padding-right: 18px; }
    .hero-visual { min-height: 320px; padding: 16px; }
    .float-card { font-size: 12px; padding: 8px 10px; }
    .float-card.two { top: 70px; }
    .float-card.three { bottom: 64px; }
    .feature-section, .process-section, .risk-section, .faq-section { padding: 54px 0; }
}