* {
    box-sizing: border-box;
}

:root {
    --primary: #2980FE;
    --primary-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #1f2937;
    --muted: #667085;
    --soft: #f5f8ff;
    --line: #e6eaf2;
    --card: #ffffff;
    --dark: #121a2f;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #ffffff;
    line-height: 1.75;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(16px);
}

.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: 0.02em;
}

.logo img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}

.site-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 14px 16px 18px;
    background: #ffffff;
    border-bottom: 1px solid var(--line);
}

.site-nav a {
    color: #344054;
    font-size: 15px;
    padding: 10px 12px;
    border-radius: 12px;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--primary);
    background: #eef5ff;
}

.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.nav-toggle-label {
    display: inline-flex;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle-label span {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: #2b3346;
}

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

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 700;
    box-shadow: 0 14px 30px rgba(41, 128, 254, 0.28);
    transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(23, 104, 232, 0.32);
}

.vpn-network-hero {
    position: relative;
    overflow: hidden;
    color: #ffffff;
    background: var(--gradient);
    padding: 62px 0 42px;
}

.vpn-network-hero::before,
.vpn-network-hero::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.16);
    filter: blur(4px);
}

.vpn-network-hero::before {
    width: 360px;
    height: 360px;
    right: -110px;
    top: -120px;
}

.vpn-network-hero::after {
    width: 260px;
    height: 260px;
    left: -100px;
    bottom: -130px;
}

.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 36px;
    align-items: center;
}

.eyebrow,
.category-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: #eef5ff;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
}

.vpn-network-hero .eyebrow {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.16);
    border: 1px solid rgba(255, 255, 255, 0.24);
}

.vpn-network-hero h1,
.page-hero h1 {
    margin: 16px 0 16px;
    line-height: 1.15;
    font-size: clamp(34px, 8vw, 62px);
    letter-spacing: -0.04em;
}

.vpn-network-hero p {
    max-width: 620px;
    color: rgba(255, 255, 255, 0.88);
    font-size: 17px;
    margin: 0 0 24px;
}

.hero-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    margin: 26px 0;
}

.hero-tags,
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.hero-tags span,
.tag-row span {
    display: inline-flex;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 13px;
}

.hero-visual {
    position: relative;
    min-height: 330px;
}

.network-card {
    position: relative;
    padding: 18px;
    border-radius: 32px;
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.26);
    box-shadow: 0 28px 70px rgba(20, 31, 76, 0.24);
}

.network-card img {
    width: min(390px, 100%);
    margin: 0 auto;
    border-radius: 28px;
}

.floating-status {
    position: absolute;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 13px;
    border-radius: 16px;
    color: #1f2937;
    background: rgba(255, 255, 255, 0.94);
    box-shadow: 0 16px 40px rgba(23, 43, 77, 0.2);
    font-size: 13px;
    font-weight: 700;
}

.floating-status::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: var(--primary);
}

.status-one { top: 26px; left: 4px; }
.status-two { top: 78px; right: 0; }
.status-three { bottom: 84px; left: 10px; }
.status-four { bottom: 28px; right: 12px; }

.section {
    padding: 66px 0;
}

.section-soft {
    background: linear-gradient(180deg, #f7faff 0%, #ffffff 100%);
}

.section-title {
    max-width: 740px;
    margin-bottom: 28px;
}

.section-title.center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.section-title h2,
.content-section h2 {
    margin: 0 0 12px;
    line-height: 1.2;
    font-size: clamp(26px, 5vw, 42px);
    letter-spacing: -0.03em;
    color: #121a2f;
}

.section-title p,
.content-section p,
.page-hero p,
.card p,
.step-card p,
.risk-card p,
.faq-item p,
.article-layout p,
.info-panel p {
    color: var(--muted);
}

.node-overview {
    margin-top: -34px;
    position: relative;
    z-index: 5;
}

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

.node-card,
.card,
.info-panel,
.step-card,
.risk-card,
.faq-item,
.download-panel,
.article-card,
.side-card {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 24px;
    box-shadow: 0 14px 40px rgba(30, 41, 59, 0.06);
}

.node-card {
    padding: 22px;
}

.node-label {
    display: inline-flex;
    padding: 5px 10px;
    border-radius: 999px;
    background: #eef5ff;
    color: var(--primary);
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 10px;
}

.node-card h3,
.card h3,
.info-panel h3,
.step-card h3,
.risk-card h3,
.article-card h3,
.side-card h3 {
    margin: 0 0 8px;
    color: #111827;
    line-height: 1.35;
}

.text-link {
    display: inline-flex;
    margin-top: 10px;
    color: var(--primary);
    font-weight: 700;
}

.split-section,
.vpn-connection-section,
.global-nodes-section,
.high-speed-section,
.privacy-protection-section,
.multi-device-section,
.encryption-protocol-section {
    display: grid;
    gap: 28px;
    align-items: center;
}

.visual-box {
    position: relative;
    padding: 20px;
    border-radius: 32px;
    background: linear-gradient(135deg, #eef5ff 0%, #ffffff 56%, #f8ecff 100%);
    border: 1px solid var(--line);
    overflow: hidden;
}

.visual-box::after {
    content: "";
    position: absolute;
    width: 120px;
    height: 120px;
    right: -40px;
    top: -40px;
    background: rgba(41, 128, 254, 0.12);
    border-radius: 999px;
}

.visual-box img {
    position: relative;
    z-index: 1;
    margin: 0 auto;
    border-radius: 24px;
}

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

.feature-list li,
.check-list li,
.simple-list li {
    position: relative;
    padding-left: 26px;
    color: #475467;
}

.feature-list li::before,
.check-list li::before,
.simple-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 11px;
    width: 9px;
    height: 9px;
    border-radius: 999px;
    background: var(--primary);
    box-shadow: 0 0 0 5px #eaf3ff;
}

.global-nodes-section {
    padding: 28px;
    border-radius: 32px;
    background: radial-gradient(circle at top right, rgba(41,128,254,0.18), transparent 28%), radial-gradient(circle at left bottom, rgba(184,77,218,0.14), transparent 30%), #f7faff;
    border: 1px solid var(--line);
}

.map-panel {
    position: relative;
    min-height: 260px;
    display: grid;
    place-items: center;
    border-radius: 28px;
    background: linear-gradient(135deg, rgba(255,255,255,0.72), rgba(255,255,255,0.92));
    overflow: hidden;
}

.map-panel::before {
    content: "";
    position: absolute;
    inset: 24px;
    background-image: linear-gradient(90deg, rgba(41,128,254,0.1) 1px, transparent 1px), linear-gradient(0deg, rgba(41,128,254,0.1) 1px, transparent 1px);
    background-size: 42px 42px;
    border-radius: 24px;
}

.map-panel img { z-index: 1; max-height: 320px; }

.speed-cards,
.no-log-policy-section,
.protocol-grid,
.risk-grid,
.faq-grid,
.article-grid,
.related-grid {
    display: grid;
    gap: 16px;
}

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

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

.info-panel {
    border-left: 4px solid var(--primary);
}

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

.step-card {
    position: relative;
    padding-top: 54px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    left: 22px;
    top: 18px;
    width: 40px;
    height: 28px;
    display: grid;
    place-items: center;
    border-radius: 999px;
    color: #ffffff;
    background: var(--primary);
    font-size: 13px;
    font-weight: 800;
}

.risk-card {
    border-top: 4px solid var(--primary);
}

.faq-item h3 {
    font-size: 17px;
}

.cta-section {
    padding: 70px 0;
    background: var(--gradient);
    color: #ffffff;
    text-align: center;
}

.cta-box {
    max-width: 760px;
    margin: 0 auto;
}

.cta-box h2 {
    margin: 0 0 12px;
    font-size: clamp(28px, 6vw, 46px);
    line-height: 1.2;
}

.cta-box p {
    color: rgba(255, 255, 255, 0.86);
    margin-bottom: 24px;
}

.page-hero {
    padding: 58px 0 36px;
    background: linear-gradient(180deg, #f4f8ff 0%, #ffffff 100%);
}

.page-hero h1 {
    color: #121a2f;
    font-size: clamp(32px, 7vw, 52px);
}

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

.article-layout {
    display: grid;
    gap: 24px;
    padding: 48px 0 70px;
}

.article-main {
    display: grid;
    gap: 20px;
}

.article-card ul,
.side-card ul,
.download-panel ol,
.download-panel ul {
    margin: 12px 0 0;
    padding-left: 20px;
    color: #475467;
}

.side-stack {
    display: grid;
    gap: 16px;
    align-content: start;
}

.download-panel {
    padding: 30px;
    max-width: 860px;
    margin: 0 auto;
}

.download-center {
    text-align: center;
    margin: 26px 0;
}

.site-footer {
    background: #111827;
    color: #cbd5e1;
    padding: 48px 0 22px;
}

.footer-grid {
    display: grid;
    gap: 28px;
}

.footer-brand {
    color: #ffffff;
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 10px;
}

.site-footer h3 {
    color: #ffffff;
    font-size: 16px;
    margin: 0 0 12px;
}

.site-footer a {
    display: block;
    color: #cbd5e1;
    margin: 8px 0;
}

.site-footer a:hover {
    color: #ffffff;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 34px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    font-size: 13px;
    color: #94a3b8;
}

@media (min-width: 640px) {
    .node-grid,
    .speed-cards,
    .protocol-grid,
    .risk-grid,
    .faq-grid,
    .article-grid,
    .related-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 900px) {
    .nav-toggle-label {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        background: transparent;
    }

    .site-nav a {
        font-size: 14px;
        padding: 8px 9px;
    }

    .hero-grid,
    .split-section,
    .vpn-connection-section,
    .global-nodes-section,
    .high-speed-section,
    .privacy-protection-section,
    .multi-device-section,
    .encryption-protocol-section {
        grid-template-columns: 1.05fr 0.95fr;
    }

    .node-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .risk-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1.4fr repeat(3, 1fr);
    }

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

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

    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (min-width: 1100px) {
    .site-nav a {
        padding: 8px 11px;
    }

    .vpn-network-hero {
        padding: 84px 0 76px;
    }
}