* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: #263242;
    background: #f5f7fb;
    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: 20;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid #e7ebf3;
}

.header-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand,
.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo,
.footer-logo {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    object-fit: cover;
    box-shadow: 0 8px 22px rgba(41, 128, 254, 0.18);
}

.brand-name {
    font-size: 17px;
    font-weight: 800;
    color: #162137;
    white-space: nowrap;
}

.nav-toggle {
    display: none;
}

.nav-toggle-label {
    display: flex;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 1px solid #dbe2ef;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: #fff;
}

.nav-toggle-label span {
    width: 18px;
    height: 2px;
    border-radius: 10px;
    background: #263242;
}

.site-nav {
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    display: none;
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 14px;
    background: #fff;
    border: 1px solid #e2e8f4;
    border-radius: 20px;
    box-shadow: 0 18px 48px rgba(20, 35, 70, 0.14);
}

.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #445166;
    font-size: 14px;
    font-weight: 650;
}

.site-nav a:hover {
    color: #2980FE;
    background: #eef5ff;
}

.nav-toggle:checked ~ .site-nav {
    display: grid;
}

.content-container,
.section-inner,
.page-container {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}

.vpn-network-hero {
    position: relative;
    overflow: hidden;
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    color: #fff;
    padding: 70px 0 78px;
}

.vpn-network-hero::before,
.cta-section::before,
.global-nodes-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 15% 20%, rgba(255,255,255,0.2) 0 3px, transparent 4px), radial-gradient(circle at 78% 30%, rgba(255,255,255,0.18) 0 2px, transparent 3px), linear-gradient(115deg, transparent 0 12%, rgba(255,255,255,0.12) 12.2%, transparent 12.5% 35%, rgba(255,255,255,0.1) 35.2%, transparent 35.5% 100%);
    opacity: 0.75;
}

.hero-grid {
    position: relative;
    display: grid;
    gap: 34px;
    align-items: center;
}

.hero-copy h1 {
    margin: 0;
    font-size: clamp(34px, 9vw, 64px);
    line-height: 1.12;
    letter-spacing: -1px;
}

.hero-copy p {
    max-width: 660px;
    margin: 18px 0 0;
    color: rgba(255,255,255,0.88);
    font-size: 16px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(41, 128, 254, 0.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    border: 0;
    white-space: nowrap;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: #1768E8;
    box-shadow: 0 18px 36px rgba(23, 104, 232, 0.3);
}

.hero-actions {
    margin-top: 26px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.hero-tags,
.service-tags,
.badge-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.hero-tags span,
.service-tags span,
.badge-row span,
.category-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.22);
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    min-height: 360px;
}

.hero-device {
    position: relative;
    z-index: 2;
    border-radius: 30px;
    padding: 14px;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.24);
    box-shadow: 0 30px 80px rgba(16, 24, 64, 0.22);
}

.hero-device img {
    border-radius: 24px;
    width: 100%;
    object-fit: cover;
}

.float-card {
    position: absolute;
    z-index: 3;
    padding: 10px 14px;
    border-radius: 16px;
    background: rgba(255,255,255,0.92);
    color: #243047;
    font-size: 13px;
    font-weight: 800;
    box-shadow: 0 18px 40px rgba(26, 34, 80, 0.18);
}

.float-card.one { top: 14px; left: 6px; }
.float-card.two { top: 18%; right: 0; }
.float-card.three { bottom: 64px; left: 0; }
.float-card.four { bottom: 20px; right: 18px; }

.section {
    padding: 72px 0;
}

.section-title {
    max-width: 760px;
    margin: 0 auto 34px;
    text-align: center;
}

.section-title.left {
    text-align: left;
    margin-left: 0;
}

.eyebrow {
    display: inline-flex;
    margin-bottom: 12px;
    padding: 6px 12px;
    border-radius: 999px;
    color: #2980FE;
    background: #eaf3ff;
    font-weight: 800;
    font-size: 13px;
}

.section-title h2,
.feature-copy h2,
.article-content h2,
.side-panel h3,
.info-panel h3 {
    margin: 0 0 12px;
    color: #172238;
    line-height: 1.25;
}

.section-title h2,
.feature-copy h2 {
    font-size: clamp(26px, 5vw, 42px);
}

.section-title p,
.feature-copy p,
.card p,
.article-content p,
.page-summary,
.faq-item p,
.footer-brand p {
    color: #637084;
    margin: 0;
}

.node-overview {
    margin-top: -44px;
    position: relative;
    z-index: 4;
    padding-bottom: 40px;
}

.node-overview-grid {
    display: grid;
    gap: 16px;
}

.node-card,
.card,
.risk-card,
.faq-item,
.step-card,
.policy-card,
.info-panel,
.side-panel,
.article-card {
    background: #fff;
    border: 1px solid #e4eaf3;
    border-radius: 24px;
    box-shadow: 0 16px 44px rgba(30, 45, 80, 0.06);
}

.node-card {
    padding: 22px;
}

.node-label {
    display: inline-flex;
    padding: 5px 10px;
    border-radius: 999px;
    background: #eaf3ff;
    color: #2980FE;
    font-size: 12px;
    font-weight: 900;
    margin-bottom: 12px;
}

.node-card h3,
.card h3,
.risk-card h3,
.step-card h3,
.policy-card h3,
.article-card h3 {
    margin: 0 0 8px;
    color: #172238;
}

.related-link,
.inline-link {
    display: inline-flex;
    margin-top: 14px;
    color: #2980FE;
    font-weight: 800;
}

.feature-split,
.device-layout,
.privacy-layout,
.speed-layout,
.protocol-layout,
.article-layout {
    display: grid;
    gap: 28px;
    align-items: center;
}

.feature-media,
.speed-media,
.privacy-media,
.protocol-media {
    border-radius: 30px;
    padding: 16px;
    background: linear-gradient(180deg, #fff, #eef5ff);
    border: 1px solid #e3eaf7;
    box-shadow: 0 20px 60px rgba(41, 128, 254, 0.09);
}

.feature-media img,
.speed-media img,
.privacy-media img,
.protocol-media img {
    border-radius: 24px;
    width: 100%;
}

.feature-list,
.check-list,
.clean-list,
.number-list {
    margin: 18px 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 10px;
}

.feature-list li,
.check-list li,
.clean-list li,
.number-list li {
    position: relative;
    padding-left: 24px;
    color: #445166;
}

.feature-list li::before,
.check-list li::before,
.clean-list li::before,
.number-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 12px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #2980FE;
}

.global-nodes-section {
    position: relative;
    overflow: hidden;
    background: #eef4ff;
}

.global-nodes-section::before {
    background-image: radial-gradient(circle at 18% 22%, rgba(41,128,254,.2) 0 3px, transparent 4px), radial-gradient(circle at 72% 35%, rgba(123,78,241,.18) 0 3px, transparent 4px), radial-gradient(circle at 62% 72%, rgba(184,77,218,.14) 0 3px, transparent 4px), linear-gradient(125deg, transparent 0 20%, rgba(41,128,254,.08) 20.2%, transparent 20.8% 44%, rgba(123,78,241,.08) 44.2%, transparent 44.8% 100%);
}

.global-nodes-section .section-inner {
    position: relative;
}

.nodes-panel {
    display: grid;
    gap: 18px;
}

.nodes-panel .card {
    padding: 22px;
}

.high-speed-section,
.process-section,
.faq-summary-section,
.simple-page-hero {
    background: #f0f5fb;
}

.speed-cards,
.policy-grid,
.risk-grid,
.faq-grid,
.article-grid {
    display: grid;
    gap: 18px;
}

.card,
.policy-card,
.risk-card,
.step-card,
.faq-item,
.article-card {
    padding: 22px;
}

.privacy-protection-section {
    background: #fff;
}

.safety-panel {
    background: linear-gradient(180deg, #f8fbff, #ffffff);
    border: 1px solid #dfe8f5;
    border-radius: 28px;
    padding: 24px;
}

.security-meter {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.security-meter div {
    padding: 14px;
    border-radius: 18px;
    background: #eef5ff;
    border-left: 4px solid #2980FE;
    color: #344259;
    font-weight: 700;
}

.no-log-policy-section,
.multi-device-section,
.encryption-protocol-section {
    background: #fff;
}

.device-card-stack {
    display: grid;
    gap: 14px;
}

.device-card {
    padding: 18px;
    border-radius: 22px;
    background: #f7f9fd;
    border: 1px solid #e2e8f4;
}

.protocol-panel {
    display: grid;
    gap: 14px;
}

.protocol-row {
    padding: 16px;
    border-radius: 18px;
    background: #f7f9fd;
    border: 1px solid #e4eaf3;
}

.process-steps {
    display: grid;
    gap: 16px;
    counter-reset: step;
}

.step-card {
    position: relative;
}

.step-number {
    display: inline-flex;
    width: 36px;
    height: 36px;
    border-radius: 14px;
    align-items: center;
    justify-content: center;
    background: #2980FE;
    color: #fff;
    font-weight: 900;
    margin-bottom: 12px;
}

.risk-card {
    border-left: 4px solid #2980FE;
}

.faq-item h3 {
    margin: 0 0 8px;
    color: #172238;
}

.cta-section {
    position: relative;
    overflow: hidden;
    padding: 74px 0;
    color: #fff;
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
}

.cta-section .section-inner {
    position: relative;
    text-align: center;
    max-width: 780px;
}

.cta-section h2 {
    margin: 0 0 12px;
    font-size: clamp(28px, 6vw, 46px);
    line-height: 1.25;
}

.cta-section p {
    margin: 0 auto 24px;
    color: rgba(255,255,255,0.86);
}

.simple-page-hero {
    padding: 62px 0 48px;
}

.simple-page-hero .page-container {
    max-width: 980px;
}

.simple-page-hero .category-badge {
    background: #eaf3ff;
    border-color: #d8e8ff;
    color: #2980FE;
}

.simple-page-hero h1 {
    margin: 14px 0 12px;
    color: #172238;
    font-size: clamp(32px, 7vw, 52px);
    line-height: 1.2;
}

.page-summary {
    font-size: 17px;
    max-width: 780px;
}

.article-section {
    padding: 56px 0 78px;
}

.article-layout {
    align-items: start;
}

.article-content,
.side-panel {
    background: #fff;
    border: 1px solid #e4eaf3;
    border-radius: 28px;
    box-shadow: 0 16px 44px rgba(30, 45, 80, 0.06);
}

.article-content {
    padding: 26px;
}

.article-content p + p {
    margin-top: 14px;
}

.article-content .download-btn {
    margin-top: 26px;
}

.side-panel {
    padding: 22px;
}

.info-panel {
    padding: 20px;
    margin-top: 22px;
    background: #f8fbff;
}

.download-steps {
    display: grid;
    gap: 16px;
    margin: 24px 0;
}

.download-step {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    padding: 18px;
    border-radius: 22px;
    background: #fff;
    border: 1px solid #e3eaf7;
}

.download-step span {
    width: 34px;
    height: 34px;
    flex: 0 0 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 13px;
    background: #2980FE;
    color: #fff;
    font-weight: 900;
}

.site-footer {
    background: #111a2c;
    color: #dfe7f3;
    padding: 42px 0 24px;
}

.footer-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 24px;
}

.footer-brand p {
    max-width: 520px;
    color: #aebbd1;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-links a {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.08);
    color: #e8eef8;
    font-size: 14px;
}

.footer-bottom {
    width: min(1180px, calc(100% - 32px));
    margin: 28px auto 0;
    color: #9eabc0;
    font-size: 13px;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 18px;
}

@media (min-width: 680px) {
    .node-overview-grid,
    .policy-grid,
    .risk-grid,
    .faq-grid,
    .speed-cards,
    .article-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 980px) {
    .nav-toggle-label {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        border-radius: 0;
        box-shadow: none;
        background: transparent;
    }

    .site-nav a {
        font-size: 13px;
        padding: 9px 10px;
    }

    .hero-grid,
    .feature-split,
    .speed-layout,
    .privacy-layout,
    .protocol-layout,
    .device-layout {
        grid-template-columns: 1.06fr .94fr;
    }

    .feature-split.reverse,
    .speed-layout {
        grid-template-columns: .94fr 1.06fr;
    }

    .hero-visual {
        min-height: 460px;
    }

    .node-overview-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .risk-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .policy-grid,
    .speed-cards {
        grid-template-columns: repeat(3, 1fr);
    }

    .process-steps {
        grid-template-columns: repeat(3, 1fr);
    }

    .article-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
    }

    .footer-inner {
        grid-template-columns: 1fr auto;
        align-items: center;
    }
}

@media (min-width: 1180px) {
    .site-nav a {
        font-size: 14px;
        padding: 10px 12px;
    }
}