* {
    box-sizing: border-box;
}

:root {
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --line: #e6eaf2;
    --panel: #ffffff;
    --soft-blue: #eef5ff;
    --shadow: 0 18px 45px rgba(31, 41, 55, .08);
    --radius: 24px;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--text);
    background: #fff;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.7;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    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: 20;
    background: rgba(255,255,255,.94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(16px);
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand,
.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: .02em;
}

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

.brand-text {
    font-size: 20px;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 4px;
    flex-wrap: wrap;
}

.site-nav a {
    padding: 8px 10px;
    color: #475467;
    font-size: 14px;
    border-radius: 999px;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--blue);
    background: var(--soft-blue);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    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, .32);
}

.kicker,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    color: var(--blue);
    background: var(--soft-blue);
    font-weight: 700;
    font-size: 13px;
}

.vpn-network-hero {
    position: relative;
    color: #fff;
    overflow: hidden;
    background: var(--gradient);
}

.vpn-network-hero::before,
.vpn-network-hero::after {
    content: "";
    position: absolute;
    inset: auto;
    border-radius: 999px;
    pointer-events: none;
}

.vpn-network-hero::before {
    width: 560px;
    height: 560px;
    right: -160px;
    top: -180px;
    background: radial-gradient(circle, rgba(255,255,255,.26), rgba(255,255,255,0) 64%);
}

.vpn-network-hero::after {
    width: 520px;
    height: 520px;
    left: -180px;
    bottom: -260px;
    background: radial-gradient(circle, rgba(255,255,255,.16), rgba(255,255,255,0) 62%);
}

.hero-grid {
    position: relative;
    z-index: 1;
    padding: 68px 0 52px;
    display: grid;
    gap: 36px;
    align-items: center;
}

.hero-copy h1 {
    margin: 14px 0 16px;
    font-size: clamp(34px, 8vw, 62px);
    line-height: 1.08;
    letter-spacing: -.05em;
}

.hero-copy p {
    margin: 0 0 24px;
    color: rgba(255,255,255,.88);
    font-size: 17px;
}

.hero-tags,
.float-tags,
.inline-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 22px;
}

.hero-tags span,
.float-tags span,
.inline-tags span {
    display: inline-flex;
    padding: 7px 11px;
    border-radius: 999px;
    background: rgba(255,255,255,.14);
    border: 1px solid rgba(255,255,255,.18);
    font-size: 13px;
}

.hero-visual {
    position: relative;
    min-height: 300px;
    border-radius: 32px;
    padding: 22px;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.2);
    box-shadow: 0 24px 80px rgba(22, 22, 80, .28);
}

.hero-visual::before {
    content: "";
    position: absolute;
    inset: 18px;
    border-radius: 28px;
    background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,.55) 0 2px, transparent 3px), radial-gradient(circle at 70% 45%, rgba(255,255,255,.45) 0 2px, transparent 3px), linear-gradient(130deg, rgba(255,255,255,.22), rgba(255,255,255,0));
    opacity: .8;
}

.hero-device {
    position: relative;
    z-index: 1;
    width: min(420px, 100%);
    margin: 0 auto;
    filter: drop-shadow(0 26px 40px rgba(18, 24, 38, .25));
}

.status-card {
    position: absolute;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-radius: 16px;
    color: #1f2937;
    background: rgba(255,255,255,.92);
    border: 1px solid rgba(255,255,255,.8);
    box-shadow: var(--shadow);
    font-weight: 700;
    font-size: 13px;
}

.status-card.one { top: 22px; left: 18px; }
.status-card.two { right: 18px; top: 72px; }
.status-card.three { left: 28px; bottom: 50px; }
.status-card.four { right: 22px; bottom: 20px; }
.status-dot {
    width: 9px;
    height: 9px;
    border-radius: 999px;
    background: var(--blue);
}

.section {
    padding: 72px 0;
}

.section.alt {
    background: var(--light);
}

.section-head {
    margin-bottom: 28px;
    max-width: 760px;
}

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

.section-head h2,
.page-title h1 {
    margin: 12px 0 12px;
    font-size: clamp(28px, 5vw, 42px);
    line-height: 1.18;
    letter-spacing: -.03em;
}

.section-head p,
.page-title p,
.card p,
.feature-copy p,
.rich-panel p,
.article-layout p {
    color: var(--muted);
}

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

.node-card,
.card,
.rich-panel,
.safety-panel,
.faq-item,
.info-box,
.step-card,
.risk-card,
.download-panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.node-card {
    padding: 22px;
}

.node-card .tag {
    display: inline-flex;
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--blue);
    font-size: 12px;
    font-weight: 800;
}

.node-card h3,
.card h3,
.info-box h3,
.step-card h3,
.risk-card h3 {
    margin: 12px 0 8px;
    font-size: 20px;
}

.text-link {
    color: var(--blue);
    font-weight: 700;
}

.text-link:hover {
    color: var(--blue-dark);
}

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

.feature-image,
.map-visual,
.device-stage,
.protocol-visual {
    border-radius: 30px;
    overflow: hidden;
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow);
}

.feature-copy h2,
.rich-panel h2 {
    margin: 10px 0 12px;
    font-size: clamp(28px, 5vw, 40px);
    line-height: 1.2;
}

.check-list,
.clean-list {
    display: grid;
    gap: 10px;
    margin: 20px 0;
    padding: 0;
    list-style: none;
}

.check-list li,
.clean-list li {
    position: relative;
    padding-left: 24px;
    color: #344054;
}

.check-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .72em;
    width: 9px;
    height: 9px;
    border-radius: 999px;
    background: var(--blue);
}

.global-nodes-wrap {
    position: relative;
    overflow: hidden;
    border-radius: 36px;
    padding: 28px;
    background: linear-gradient(135deg, #f9fbff 0%, #edf4ff 100%);
    border: 1px solid var(--line);
}

.global-nodes-wrap::before {
    content: "";
    position: absolute;
    inset: 24px;
    border-radius: 28px;
    background-image: radial-gradient(circle at 18% 30%, #2980FE 0 3px, transparent 4px), radial-gradient(circle at 68% 42%, #7B4EF1 0 3px, transparent 4px), radial-gradient(circle at 48% 72%, #B84DDA 0 3px, transparent 4px), linear-gradient(120deg, transparent 0 35%, rgba(41,128,254,.18) 36%, transparent 38% 60%, rgba(123,78,241,.18) 62%, transparent 64%);
    opacity: .58;
}

.map-visual,
.map-content {
    position: relative;
    z-index: 1;
}

.speed-lines {
    display: grid;
    gap: 14px;
    margin-top: 20px;
}

.speed-line {
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}

.speed-bar {
    height: 8px;
    margin-top: 12px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--blue), #7B4EF1);
}

.privacy-panel {
    padding: 24px;
}

.privacy-cards,
.no-log-cards,
.protocol-cards,
.card-grid,
.risk-grid,
.faq-grid,
.related-grid {
    display: grid;
    gap: 16px;
}

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

.no-log-policy-section .card {
    border-top: 4px solid var(--blue);
}

.device-stage {
    padding: 22px;
    background: linear-gradient(135deg, #ffffff, #f3f7ff);
}

.device-card-row {
    display: grid;
    gap: 12px;
    margin-top: 16px;
}

.device-mini {
    padding: 15px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}

.protocol-visual {
    padding: 24px;
    background: #fff;
}

.protocol-stack {
    display: grid;
    gap: 12px;
}

.protocol-layer {
    padding: 16px;
    border-radius: 18px;
    background: var(--light);
    border-left: 4px solid var(--blue);
}

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

.step-card {
    position: relative;
    padding-top: 56px;
}

.step-number {
    position: absolute;
    left: 20px;
    top: 20px;
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: #fff;
    background: var(--blue);
    font-weight: 800;
}

.risk-card {
    border-left: 4px solid var(--blue);
}

.risk-card strong {
    display: block;
    margin-top: 8px;
    color: var(--text);
}

.faq-item h3,
.faq-item summary {
    margin: 0 0 8px;
    font-size: 18px;
    font-weight: 800;
    cursor: pointer;
}

.faq-item p {
    margin: 0;
}

.cta-section {
    color: #fff;
    background: var(--gradient);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: "";
    position: absolute;
    width: 420px;
    height: 420px;
    right: -140px;
    top: -160px;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
}

.cta-section .container {
    position: relative;
    z-index: 1;
}

.cta-section h2 {
    margin: 0 0 12px;
    font-size: clamp(28px, 5vw, 42px);
}

.cta-section p {
    color: rgba(255,255,255,.88);
    margin: 0 auto 24px;
    max-width: 720px;
}

.page-hero {
    padding: 64px 0 36px;
    background: linear-gradient(180deg, #f6f9ff 0%, #ffffff 100%);
}

.page-title {
    max-width: 820px;
}

.article-layout {
    display: grid;
    gap: 24px;
    align-items: start;
    padding: 36px 0 72px;
}

.article-main {
    min-width: 0;
}

.article-main h2 {
    margin-top: 34px;
    font-size: 26px;
}

.article-main .download-wrap {
    margin-top: 28px;
}

.side-panel {
    display: grid;
    gap: 16px;
}

.info-box img {
    margin-top: 16px;
    border-radius: 18px;
    border: 1px solid var(--line);
}

.download-panel {
    padding: 28px;
    background: linear-gradient(135deg, #ffffff 0%, #f3f7ff 100%);
}

.numbered-list {
    padding-left: 20px;
    color: var(--muted);
}

.numbered-list li {
    margin: 10px 0;
}

.site-footer {
    padding: 52px 0 24px;
    background: #f7f9fc;
    border-top: 1px solid var(--line);
}

.footer-grid {
    display: grid;
    gap: 24px;
}

.site-footer p {
    color: var(--muted);
    margin-bottom: 0;
}

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

.site-footer a {
    display: block;
    color: var(--muted);
    margin: 8px 0;
}

.site-footer a:hover {
    color: var(--blue);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 24px;
    margin-top: 28px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 14px;
}

@media (min-width: 680px) {
    .node-overview,
    .privacy-cards,
    .no-log-cards,
    .protocol-cards,
    .card-grid,
    .risk-grid,
    .related-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

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

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

@media (min-width: 920px) {
    .hero-grid,
    .feature-grid,
    .global-nodes-section,
    .high-speed-section,
    .privacy-protection-section,
    .multi-device-section,
    .encryption-protocol-section,
    .article-layout {
        grid-template-columns: 1.05fr .95fr;
    }

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

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

    .faq-grid,
    .no-log-cards,
    .protocol-cards {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

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

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

    .hero-grid {
        padding: 86px 0 76px;
    }

    .site-nav a {
        padding: 9px 12px;
    }
}

@media (max-width: 720px) {
    .header-inner {
        align-items: flex-start;
        flex-direction: column;
        padding: 14px 0;
    }

    .site-nav {
        justify-content: flex-start;
        width: 100%;
    }

    .site-nav a {
        background: #f7f9fc;
    }

    .section {
        padding: 52px 0;
    }

    .download-btn {
        width: 100%;
        max-width: 320px;
    }

    .status-card {
        position: relative;
        left: auto !important;
        right: auto !important;
        top: auto !important;
        bottom: auto !important;
        margin: 8px 6px 0 0;
    }

    .float-tags {
        display: block;
    }

    .hero-visual {
        min-height: auto;
    }
}