* {
    box-sizing: border-box;
}
:root {
    --gradient-main: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f6f8fb;
    --line: #e5e9f2;
    --panel: #ffffff;
    --soft-blue: #eef5ff;
    --radius-xl: 28px;
    --radius-lg: 22px;
    --shadow-soft: 0 18px 50px rgba(36, 52, 86, 0.11);
}
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: #ffffff;
    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: 50;
    background: rgba(255,255,255,0.96);
    border-bottom: 1px solid rgba(229,233,242,0.9);
    backdrop-filter: blur(16px);
}
.nav-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #172036;
    letter-spacing: 0.04em;
}
.logo-img, .footer-logo {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 10px 24px rgba(41,128,254,0.22);
}
.brand-text {
    font-size: 20px;
}
.nav-toggle {
    display: none;
}
.nav-toggle-label {
    width: 42px;
    height: 42px;
    display: grid;
    place-content: center;
    gap: 5px;
    border: 1px solid var(--line);
    border-radius: 14px;
    cursor: pointer;
}
.nav-toggle-label span {
    width: 20px;
    height: 2px;
    background: #344054;
    border-radius: 10px;
}
.site-nav {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 16px;
    background: #ffffff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
}
.nav-toggle:checked ~ .site-nav {
    display: flex;
}
.site-nav a {
    padding: 12px 14px;
    border-radius: 14px;
    color: #344054;
    font-size: 15px;
}
.site-nav a:hover, .site-nav a.active {
    color: var(--blue);
    background: var(--soft-blue);
}
.content-container, .section-container {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}
.section-padding {
    padding: 62px 0;
}
.section-eyebrow, .category-badge, .mini-tag, .hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--blue);
    background: #eef5ff;
    border: 1px solid #dbeafe;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    background: var(--blue);
    color: #ffffff;
    border-radius: 999px;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(41,128,254,0.28);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}
.download-btn:hover {
    background: var(--blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 18px 36px rgba(23,104,232,0.32);
}
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    background: var(--gradient-main);
    color: #ffffff;
    padding: 64px 0 52px;
}
.vpn-network-hero::before, .cta-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 16% 22%, rgba(255,255,255,0.32) 0 2px, transparent 3px),
        radial-gradient(circle at 72% 42%, rgba(255,255,255,0.25) 0 2px, transparent 3px),
        radial-gradient(circle at 48% 76%, rgba(255,255,255,0.22) 0 2px, transparent 3px),
        linear-gradient(125deg, rgba(255,255,255,0.18), transparent 38%);
    opacity: 0.82;
}
.vpn-network-hero::after {
    content: "";
    position: absolute;
    width: 620px;
    height: 620px;
    right: -230px;
    top: -170px;
    border-radius: 50%;
    background: rgba(255,255,255,0.13);
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-content h1 {
    font-size: clamp(34px, 9vw, 64px);
    line-height: 1.08;
    margin: 16px 0 18px;
    letter-spacing: -0.04em;
}
.hero-content p {
    max-width: 720px;
    color: rgba(255,255,255,0.9);
    font-size: 17px;
    margin: 0 0 22px;
}
.hero-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin: 22px 0;
}
.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.hero-tag {
    background: rgba(255,255,255,0.16);
    color: #ffffff;
    border-color: rgba(255,255,255,0.24);
}
.hero-visual {
    position: relative;
    min-height: 320px;
    display: grid;
    place-items: center;
}
.hero-visual::before {
    content: "";
    position: absolute;
    inset: 14px;
    border: 1px solid rgba(255,255,255,0.20);
    border-radius: 34px;
    transform: rotate(-2deg);
}
.hero-visual img {
    position: relative;
    z-index: 2;
    width: min(440px, 86vw);
    border-radius: 32px;
    box-shadow: 0 28px 80px rgba(16, 24, 40, 0.30);
}
.status-card {
    position: absolute;
    z-index: 3;
    background: rgba(255,255,255,0.94);
    color: #1f2937;
    border-radius: 18px;
    padding: 10px 14px;
    border: 1px solid rgba(255,255,255,0.65);
    box-shadow: 0 16px 34px rgba(16,24,40,0.16);
    font-size: 13px;
    font-weight: 800;
}
.status-card.one { left: 0; top: 42px; }
.status-card.two { right: 0; top: 78px; }
.status-card.three { left: 14px; bottom: 54px; }
.status-card.four { right: 10px; bottom: 36px; }
.node-overview {
    margin-top: -26px;
    position: relative;
    z-index: 3;
}
.overview-grid {
    display: grid;
    gap: 16px;
}
.node-card, .feature-card, .risk-card, .faq-item, .step-card, .info-card, .text-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: 0 12px 30px rgba(16, 24, 40, 0.06);
}
.node-card h3, .feature-card h3, .risk-card h3, .step-card h3, .info-card h3 {
    margin: 12px 0 8px;
    font-size: 20px;
}
.node-card p, .feature-card p, .risk-card p, .step-card p, .info-card p, .text-card p {
    color: var(--muted);
    margin: 0 0 12px;
}
.card-link, .inline-link {
    color: var(--blue);
    font-weight: 800;
}
.card-link:hover, .inline-link:hover {
    color: var(--blue-hover);
}
.split-section, .vpn-connection-section, .global-nodes-section, .high-speed-section, .privacy-protection-section, .multi-device-section, .encryption-protocol-section {
    padding: 70px 0;
}
.split-grid, .connection-grid, .nodes-grid, .speed-grid, .privacy-grid, .device-grid, .protocol-grid, .page-layout {
    display: grid;
    gap: 28px;
    align-items: center;
}
.section-title {
    font-size: clamp(28px, 6vw, 44px);
    line-height: 1.18;
    margin: 14px 0 16px;
    letter-spacing: -0.03em;
}
.section-lead {
    color: var(--muted);
    font-size: 17px;
    margin: 0 0 22px;
}
.bullet-list, .check-list, .clean-list {
    padding: 0;
    margin: 18px 0;
    list-style: none;
    display: grid;
    gap: 10px;
}
.bullet-list li, .check-list li, .clean-list li {
    position: relative;
    padding-left: 26px;
    color: #475467;
}
.bullet-list li::before, .check-list li::before, .clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.75em;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 5px rgba(41,128,254,0.12);
}
.image-panel {
    position: relative;
    border-radius: 32px;
    padding: 18px;
    background: linear-gradient(145deg, #ffffff, #eef5ff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
}
.image-panel img {
    border-radius: 26px;
    width: 100%;
    object-fit: cover;
}
.global-nodes-section {
    background: #f6f8fb;
    position: relative;
    overflow: hidden;
}
.global-nodes-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 18% 28%, rgba(41,128,254,0.20) 0 3px, transparent 4px),
        radial-gradient(circle at 62% 42%, rgba(123,78,241,0.18) 0 3px, transparent 4px),
        radial-gradient(circle at 78% 72%, rgba(184,77,218,0.15) 0 3px, transparent 4px),
        linear-gradient(110deg, transparent 0 30%, rgba(41,128,254,0.08) 30% 31%, transparent 31% 100%);
}
.global-nodes-section > .section-container {
    position: relative;
    z-index: 1;
}
.nodes-map-panel {
    background: rgba(255,255,255,0.88);
    border: 1px solid var(--line);
    border-radius: 32px;
    padding: 24px;
    box-shadow: var(--shadow-soft);
}
.nodes-map-panel img {
    border-radius: 26px;
}
.node-lines {
    display: grid;
    gap: 10px;
    margin-top: 18px;
}
.node-line {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 14px;
    background: #f8fbff;
    border-radius: 16px;
    color: #475467;
}
.node-line span:last-child {
    color: var(--blue);
    font-weight: 800;
}
.high-speed-section {
    background: #f4f8ff;
}
.speed-card-stack, .policy-grid, .risk-grid, .faq-grid, .feature-grid, .guide-grid {
    display: grid;
    gap: 16px;
}
.speed-mini-card {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 18px;
}
.speed-mini-card strong {
    display: block;
    margin-bottom: 6px;
}
.speed-bar {
    height: 9px;
    border-radius: 99px;
    background: #e5efff;
    overflow: hidden;
    margin-top: 12px;
}
.speed-bar span {
    display: block;
    height: 100%;
    background: var(--blue);
    border-radius: 99px;
}
.privacy-protection-section .privacy-panel, .safety-panel, .protocol-panel {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 24px;
    box-shadow: var(--shadow-soft);
}
.privacy-tags, .protocol-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 16px 0 0;
}
.no-log-policy-section {
    padding: 70px 0;
    background: #ffffff;
}
.policy-grid {
    margin-top: 26px;
}
.multi-device-section {
    background: #f7f9fc;
}
.device-grid-list {
    display: grid;
    gap: 12px;
}
.device-pill {
    padding: 14px 16px;
    border: 1px solid var(--line);
    background: #ffffff;
    border-radius: 18px;
    color: #475467;
}
.encryption-protocol-section {
    background: #ffffff;
}
.protocol-panel {
    display: grid;
    gap: 14px;
}
.protocol-row {
    padding: 16px;
    border-radius: 18px;
    background: #f8fbff;
    border: 1px solid #e4efff;
}
.process-section {
    padding: 70px 0;
    background: #f6f8fb;
}
.process-steps {
    display: grid;
    gap: 16px;
    margin-top: 26px;
}
.step-number {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    color: #ffffff;
    background: var(--blue);
    font-weight: 900;
}
.safety-section {
    padding: 70px 0;
}
.risk-card {
    border-left: 4px solid var(--blue);
}
.risk-card .advice {
    margin-top: 12px;
    padding: 10px 12px;
    background: #f4f8ff;
    border-radius: 12px;
    color: #344054;
}
.faq-section {
    padding: 70px 0;
    background: #f7f9fc;
}
.faq-item h3 {
    margin: 0 0 8px;
    font-size: 18px;
}
.faq-item p {
    color: var(--muted);
    margin: 0;
}
.cta-section {
    position: relative;
    overflow: hidden;
    margin: 70px auto;
    width: min(1180px, calc(100% - 32px));
    background: var(--gradient-main);
    color: #ffffff;
    border-radius: 34px;
    padding: 42px 24px;
    text-align: center;
}
.cta-section > * {
    position: relative;
    z-index: 1;
}
.cta-section h2 {
    margin: 0 0 12px;
    font-size: clamp(26px, 7vw, 42px);
}
.cta-section p {
    max-width: 680px;
    margin: 0 auto 22px;
    color: rgba(255,255,255,0.9);
}
.page-hero {
    background: linear-gradient(180deg, #f4f8ff 0%, #ffffff 100%);
    padding: 54px 0 28px;
}
.page-hero h1 {
    font-size: clamp(32px, 8vw, 52px);
    line-height: 1.15;
    margin: 16px 0 14px;
    letter-spacing: -0.035em;
}
.page-hero p {
    color: var(--muted);
    font-size: 17px;
    margin: 0;
    max-width: 760px;
}
.page-body {
    padding: 42px 0 70px;
}
.article-card {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: 0 12px 30px rgba(16,24,40,0.05);
}
.article-card h2 {
    margin-top: 0;
    font-size: 26px;
}
.article-card p {
    color: #475467;
}
.side-panel {
    background: #f7f9fc;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 22px;
    align-self: start;
}
.side-panel h3 {
    margin-top: 0;
}
.download-wrap {
    margin-top: 24px;
}
.download-page-card {
    max-width: 880px;
    margin: 0 auto;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 26px;
    box-shadow: var(--shadow-soft);
}
.site-footer {
    background: #101828;
    color: #d0d5dd;
    padding: 46px 0;
}
.footer-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 24px;
}
.footer-brand {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}
.footer-brand strong {
    color: #ffffff;
    font-size: 20px;
}
.footer-brand p, .footer-note {
    margin: 6px 0 0;
    color: #98a2b3;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 18px;
}
.footer-links a {
    color: #d0d5dd;
}
.footer-links a:hover {
    color: #ffffff;
}
@media (min-width: 640px) {
    .overview-grid, .policy-grid, .risk-grid, .faq-grid, .feature-grid, .guide-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    .download-page-card, .article-card {
        padding: 34px;
    }
}
@media (min-width: 900px) {
    .nav-toggle-label {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0;
        background: transparent;
        border: 0;
        box-shadow: none;
        gap: 3px;
    }
    .site-nav a {
        padding: 8px 10px;
        font-size: 14px;
    }
    .hero-grid, .connection-grid, .nodes-grid, .speed-grid, .privacy-grid, .device-grid, .protocol-grid, .split-grid {
        grid-template-columns: 1.05fr 0.95fr;
    }
    .page-layout {
        grid-template-columns: minmax(0, 1fr) 330px;
    }
    .overview-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .risk-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .faq-grid, .policy-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .feature-grid, .guide-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(3, 1fr);
    }
    .vpn-network-hero {
        padding: 88px 0 76px;
    }
    .section-padding, .split-section, .vpn-connection-section, .global-nodes-section, .high-speed-section, .privacy-protection-section, .multi-device-section, .encryption-protocol-section, .no-log-policy-section, .process-section, .safety-section, .faq-section {
        padding: 90px 0;
    }
}
@media (min-width: 1120px) {
    .site-nav a {
        padding: 9px 14px;
        font-size: 15px;
    }
    .process-steps {
        grid-template-columns: repeat(6, 1fr);
    }
}