* {
    box-sizing: border-box;
}
:root {
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f8ff;
    --line: #e5eaf3;
    --white: #ffffff;
    --dark: #101828;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --shadow: 0 18px 45px rgba(28, 44, 86, .10);
    --radius: 24px;
}
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: #f8fbff;
    line-height: 1.7;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(229,234,243,.85);
}
.header-inner,
.footer-inner,
.section-inner,
.page-container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}
.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: .04em;
}
.logo img {
    width: 38px;
    height: 38px;
    object-fit: cover;
    border-radius: 12px;
}
.site-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    padding: 16px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.site-nav.open {
    display: flex;
}
.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #344054;
    font-size: 15px;
}
.site-nav a:hover,
.site-nav a.active {
    color: var(--blue);
    background: #eef5ff;
}
.nav-toggle {
    border: 0;
    background: #eef5ff;
    border-radius: 12px;
    padding: 10px;
    width: 44px;
    height: 44px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}
.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--blue);
    border-radius: 2px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 12px 24px;
    color: #fff;
    background: var(--blue);
    border-radius: 999px;
    font-weight: 700;
    box-shadow: 0 12px 24px rgba(41,128,254,.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover {
    background: var(--blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 16px 30px rgba(23,104,232,.30);
}
.text-link {
    color: var(--blue);
    font-weight: 700;
}
.badge,
.category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    color: var(--blue);
    background: #eef5ff;
    border: 1px solid #dbeafe;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}
.gradient-bg,
.vpn-network-hero,
.cta-section {
    background: var(--gradient);
}
.vpn-network-hero {
    position: relative;
    color: #fff;
    overflow: hidden;
}
.vpn-network-hero:before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 15% 25%, rgba(255,255,255,.26) 0 2px, transparent 3px), radial-gradient(circle at 78% 34%, rgba(255,255,255,.22) 0 2px, transparent 3px), radial-gradient(circle at 52% 70%, rgba(255,255,255,.18) 0 2px, transparent 3px), linear-gradient(135deg, transparent 0 48%, rgba(255,255,255,.18) 49%, transparent 51%);
    background-size: 220px 180px, 260px 200px, 210px 190px, 360px 260px;
    opacity: .75;
}
.hero-inner {
    position: relative;
    z-index: 1;
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 76px 0 56px;
    display: grid;
    gap: 34px;
}
.hero-copy h1 {
    margin: 18px 0 16px;
    font-size: clamp(34px, 8vw, 64px);
    line-height: 1.08;
    letter-spacing: -.04em;
}
.hero-copy p {
    margin: 0 0 24px;
    max-width: 650px;
    color: rgba(255,255,255,.88);
    font-size: 17px;
}
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}
.hero-tags,
.status-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}
.hero-tags span,
.status-tags span {
    padding: 8px 12px;
    border: 1px solid rgba(255,255,255,.28);
    background: rgba(255,255,255,.13);
    border-radius: 999px;
    color: #fff;
    font-size: 13px;
}
.hero-visual {
    position: relative;
    min-height: 310px;
}
.hero-card {
    position: relative;
    padding: 22px;
    border: 1px solid rgba(255,255,255,.28);
    border-radius: 32px;
    background: rgba(255,255,255,.14);
    box-shadow: 0 26px 80px rgba(22,22,70,.28);
}
.hero-card img {
    margin: 0 auto;
    border-radius: 28px;
}
.float-label {
    position: absolute;
    padding: 10px 14px;
    color: #1d2b55;
    background: #fff;
    border-radius: 999px;
    box-shadow: 0 12px 28px rgba(20,34,82,.16);
    font-size: 13px;
    font-weight: 800;
}
.float-label.one { left: 12px; top: 20px; }
.float-label.two { right: 10px; top: 64px; }
.float-label.three { left: 22px; bottom: 42px; }
.float-label.four { right: 20px; bottom: 12px; }
.section {
    padding: 68px 0;
}
.section-title {
    max-width: 760px;
    margin-bottom: 26px;
}
.section-title.center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}
.section-title h2,
.page-hero h1,
.article-main h2 {
    margin: 8px 0 12px;
    color: var(--dark);
    line-height: 1.2;
}
.section-title h2 {
    font-size: clamp(28px, 5vw, 42px);
}
.section-title p,
.page-hero p,
.card p,
.feature-copy p,
.article-main p,
.faq-item p,
.cta-section p {
    color: var(--muted);
}
.node-overview {
    margin-top: -28px;
    position: relative;
    z-index: 2;
}
.node-grid,
.card-grid,
.risk-grid,
.no-log-grid,
.faq-grid,
.step-grid,
.device-grid {
    display: grid;
    gap: 18px;
}
.node-card,
.card,
.risk-card,
.step-card,
.faq-item,
.panel,
.article-card,
.check-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.node-card,
.card,
.risk-card,
.step-card,
.faq-item,
.article-card,
.check-card {
    padding: 22px;
}
.node-card strong,
.card h3,
.risk-card h3,
.step-card h3,
.faq-item h3,
.article-card h3,
.check-card h3 {
    display: block;
    margin: 0 0 8px;
    color: var(--dark);
    font-size: 19px;
}
.node-card .tag {
    display: inline-flex;
    margin-bottom: 14px;
    padding: 5px 10px;
    color: var(--blue);
    background: #eef5ff;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 800;
}
.feature-section {
    background: #fff;
}
.feature-layout {
    display: grid;
    gap: 28px;
    align-items: center;
}
.feature-copy ul,
.article-main ul,
.article-main ol,
.download-steps ol {
    padding-left: 20px;
    color: #475467;
}
.image-panel {
    padding: 18px;
    border-radius: 30px;
    background: linear-gradient(180deg, #ffffff 0%, #eef5ff 100%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.image-panel img {
    border-radius: 24px;
    margin: 0 auto;
}
.global-nodes-section {
    background: #f3f7ff;
}
.map-panel {
    position: relative;
    padding: 24px;
    border-radius: 32px;
    background: radial-gradient(circle at 18% 20%, #dbeafe 0 4px, transparent 5px), radial-gradient(circle at 78% 30%, #c7d2fe 0 5px, transparent 6px), radial-gradient(circle at 55% 70%, #e9d5ff 0 4px, transparent 5px), #ffffff;
    background-size: 180px 150px, 220px 160px, 200px 160px, auto;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.map-panel:before {
    content: "";
    position: absolute;
    inset: 24px;
    border-radius: 26px;
    background: linear-gradient(135deg, transparent 0 48%, rgba(41,128,254,.18) 49%, transparent 52%);
    pointer-events: none;
}
.high-speed-section {
    background: #f6f8fc;
}
.speed-lines {
    display: grid;
    gap: 14px;
}
.speed-line {
    padding: 14px 16px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
}
.speed-line span {
    display: flex;
    justify-content: space-between;
    color: #344054;
    font-weight: 700;
}
.speed-bar {
    height: 8px;
    margin-top: 10px;
    border-radius: 99px;
    background: #e8eef8;
    overflow: hidden;
}
.speed-bar i {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: var(--blue);
}
.privacy-protection-section {
    background: #fff;
}
.security-panel {
    padding: 24px;
    border-radius: 30px;
    background: #f8fbff;
    border: 1px solid var(--line);
}
.security-panel .mini-card {
    padding: 16px;
    margin-top: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
}
.no-log-policy-section,
.encryption-protocol-section {
    background: #f8fbff;
}
.no-log-grid .card {
    border-top: 4px solid var(--blue);
}
.multi-device-section {
    background: #fff;
}
.device-card {
    padding: 18px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 22px;
}
.tech-panel {
    padding: 24px;
    border-radius: 30px;
    background: linear-gradient(180deg, #fff 0%, #f1f5ff 100%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.tech-row {
    display: grid;
    gap: 14px;
    margin-top: 18px;
}
.tech-row span {
    padding: 14px;
    border-radius: 16px;
    background: #fff;
    border: 1px solid var(--line);
    color: #344054;
}
.process-steps {
    background: #fff;
}
.step-card .step-num {
    display: inline-flex;
    width: 38px;
    height: 38px;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    color: #fff;
    background: var(--blue);
    border-radius: 14px;
    font-weight: 800;
}
.risk-section {
    background: #f6f8fc;
}
.risk-card {
    border-left: 4px solid var(--blue);
}
.cta-section {
    color: #fff;
    text-align: center;
    padding: 72px 0;
}
.cta-section h2 {
    margin: 0 0 12px;
    font-size: clamp(28px, 5vw, 44px);
}
.cta-section p {
    max-width: 640px;
    margin: 0 auto 24px;
    color: rgba(255,255,255,.86);
}
.page-hero {
    padding: 62px 0 36px;
    background: linear-gradient(180deg, #eef5ff 0%, #ffffff 100%);
}
.page-hero h1 {
    font-size: clamp(32px, 6vw, 52px);
}
.page-layout {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 42px 0 72px;
    display: grid;
    gap: 24px;
}
.article-main,
.sidebar {
    min-width: 0;
}
.article-main {
    display: grid;
    gap: 22px;
}
.article-card.highlight {
    background: linear-gradient(180deg, #ffffff 0%, #f4f8ff 100%);
}
.sidebar {
    display: grid;
    align-content: start;
    gap: 18px;
}
.sidebar .panel {
    padding: 20px;
}
.sidebar a,
.card a,
.node-card a,
.step-card a,
.risk-card a,
.article-card a {
    color: var(--blue);
    font-weight: 700;
}
.download-page .download-card {
    text-align: center;
    padding: 32px;
}
.download-steps,
.safety-panel {
    padding: 24px;
    border-radius: var(--radius);
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.safety-panel {
    background: #f8fbff;
}
.site-footer {
    background: #101828;
    color: #d0d5dd;
}
.footer-inner {
    padding: 52px 0 36px;
    display: grid;
    gap: 28px;
}
.footer-logo span {
    color: #fff;
}
.footer-brand p {
    max-width: 420px;
    color: #a7b0c0;
}
.footer-links {
    display: grid;
    gap: 20px;
}
.footer-links h3 {
    margin: 0 0 12px;
    color: #fff;
    font-size: 16px;
}
.footer-links a {
    display: block;
    margin: 8px 0;
    color: #a7b0c0;
}
.footer-links a:hover {
    color: #fff;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.10);
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 18px 0 26px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: #98a2b3;
    font-size: 14px;
}
@media (min-width: 680px) {
    .node-grid,
    .card-grid,
    .risk-grid,
    .step-grid,
    .device-grid,
    .no-log-grid,
    .faq-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .footer-links {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}
@media (min-width: 960px) {
    .nav-toggle {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .site-nav a {
        font-size: 14px;
        padding: 8px 10px;
    }
    .hero-inner {
        grid-template-columns: 1.02fr .98fr;
        align-items: center;
        padding: 100px 0 84px;
    }
    .node-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    .feature-layout,
    .page-layout {
        grid-template-columns: 1fr 1fr;
    }
    .page-layout {
        grid-template-columns: minmax(0, 1fr) 330px;
        align-items: start;
    }
    .feature-layout.reverse .feature-copy {
        order: 2;
    }
    .feature-layout.reverse .image-panel,
    .feature-layout.reverse .map-panel,
    .feature-layout.reverse .tech-panel {
        order: 1;
    }
    .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .no-log-grid,
    .card-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .step-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .footer-inner {
        grid-template-columns: .9fr 1.3fr;
    }
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}
@media (max-width: 420px) {
    .header-inner,
    .footer-inner,
    .section-inner,
    .page-container,
    .hero-inner,
    .page-layout {
        width: min(100% - 24px, 1120px);
    }
    .section {
        padding: 52px 0;
    }
    .download-btn {
        width: 100%;
    }
    .float-label {
        position: static;
        display: inline-flex;
        margin: 8px 6px 0 0;
    }
    .hero-card {
        padding: 14px;
    }
}