* {
    box-sizing: border-box;
}

:root {
    --primary: #2980FE;
    --primary-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #1F2937;
    --muted: #64748B;
    --light: #F5F7FB;
    --line: #E5EAF3;
    --white: #FFFFFF;
    --deep: #111827;
    --radius-lg: 28px;
    --radius-md: 20px;
    --shadow: 0 18px 50px rgba(31, 41, 55, 0.10);
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "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%;
    height: auto;
    display: block;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(229, 234, 243, 0.88);
}

.header-inner,
.container,
.footer-inner,
.footer-bottom {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex: 0 0 auto;
}

.brand-logo {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    object-fit: cover;
    box-shadow: 0 8px 20px rgba(41, 128, 254, 0.22);
}

.brand-name {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: 0.04em;
    color: #172033;
}

.site-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    position: absolute;
    left: 0;
    top: 72px;
    background: #FFFFFF;
    border-bottom: 1px solid var(--line);
    padding: 12px 18px 18px;
    box-shadow: 0 18px 36px rgba(15, 23, 42, 0.08);
}

.site-nav.open {
    display: flex;
}

.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #475569;
    font-size: 15px;
    font-weight: 650;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--primary);
    background: #EEF5FF;
}

.nav-toggle {
    width: 44px;
    height: 44px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #FFFFFF;
    cursor: pointer;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: #1F2937;
    border-radius: 99px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 26px;
    border-radius: 999px;
    background: #2980FE;
    color: #FFFFFF;
    font-weight: 800;
    letter-spacing: 0.02em;
    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: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 18px 36px rgba(23, 104, 232, 0.32);
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-weight: 700;
}

.text-link::after {
    content: "›";
    font-size: 18px;
    line-height: 1;
}

.pill,
.badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 6px 12px;
    border-radius: 999px;
    background: #EEF5FF;
    color: var(--primary);
    font-weight: 800;
    font-size: 13px;
}

.gradient-background,
.vpn-network-hero,
.cta-section {
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
}

.vpn-network-hero {
    position: relative;
    overflow: hidden;
    color: #FFFFFF;
    padding: 66px 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(1px);
}

.vpn-network-hero::before {
    width: 620px;
    height: 620px;
    right: -260px;
    top: -260px;
}

.vpn-network-hero::after {
    width: 420px;
    height: 420px;
    left: -220px;
    bottom: -180px;
}

.hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    gap: 36px;
    align-items: center;
}

.hero-copy h1 {
    margin: 16px 0 18px;
    font-size: clamp(34px, 8vw, 64px);
    line-height: 1.08;
    letter-spacing: -0.04em;
}

.hero-copy p {
    margin: 0 0 24px;
    color: rgba(255, 255, 255, 0.88);
    font-size: 17px;
    max-width: 660px;
}

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

.hero-tags span,
.status-row span,
.tag-row span {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.13);
    border: 1px solid rgba(255, 255, 255, 0.24);
    color: #FFFFFF;
    font-size: 13px;
    font-weight: 700;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 22px;
}

.hero-visual {
    position: relative;
    min-height: 340px;
}

.network-panel {
    position: relative;
    min-height: 340px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: 34px;
    background: rgba(255, 255, 255, 0.14);
    box-shadow: 0 24px 80px rgba(15, 23, 42, 0.24);
    overflow: hidden;
    padding: 24px;
}

.network-panel::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.38) 0 3px, transparent 4px),
        radial-gradient(circle at 72% 28%, rgba(255, 255, 255, 0.32) 0 3px, transparent 4px),
        radial-gradient(circle at 40% 70%, rgba(255, 255, 255, 0.30) 0 3px, transparent 4px),
        linear-gradient(135deg, transparent 0 20%, rgba(255,255,255,0.22) 21%, transparent 22% 48%, rgba(255,255,255,0.18) 49%, transparent 50%);
    opacity: 0.82;
}

.network-panel img {
    position: relative;
    z-index: 2;
    margin: 18px auto 0;
    max-height: 300px;
    object-fit: contain;
}

.floating-status {
    position: absolute;
    z-index: 3;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.92);
    color: #172033;
    font-size: 13px;
    font-weight: 800;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.16);
}

.floating-status::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: #2AD184;
    box-shadow: 0 0 0 5px rgba(42, 209, 132, 0.16);
}

.status-one { left: 16px; top: 18px; }
.status-two { right: 18px; top: 62px; }
.status-three { left: 22px; bottom: 34px; }
.status-four { right: 20px; bottom: 68px; }

.section {
    padding: 64px 0;
}

.section.soft,
.high-speed-section,
.page-hero {
    background: #F6F8FC;
}

.section-title {
    margin: 0 0 14px;
    font-size: clamp(26px, 5vw, 42px);
    line-height: 1.2;
    letter-spacing: -0.03em;
    color: #101827;
}

.section-lead {
    margin: 0;
    color: var(--muted);
    font-size: 16px;
    max-width: 760px;
}

.section-head {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 28px;
}

.node-overview {
    display: grid;
    gap: 16px;
    margin-top: -22px;
    position: relative;
    z-index: 5;
}

.node-card,
.info-card,
.risk-card,
.step-card,
.faq-item,
.check-card,
.protocol-card,
.page-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
}

.node-card {
    padding: 22px;
}

.node-card .mini-label {
    display: inline-flex;
    margin-bottom: 14px;
    padding: 4px 10px;
    border-radius: 999px;
    background: #EEF5FF;
    color: var(--primary);
    font-size: 12px;
    font-weight: 800;
}

.node-card h3,
.info-card h3,
.risk-card h3,
.step-card h3,
.faq-item h3,
.protocol-card h3,
.page-card h3 {
    margin: 0 0 8px;
    color: #111827;
    font-size: 19px;
}

.node-card p,
.info-card p,
.risk-card p,
.step-card p,
.faq-item p,
.protocol-card p,
.page-card p {
    margin: 0 0 14px;
    color: var(--muted);
}

.vpn-connection-section,
.global-nodes-section,
.high-speed-section,
.privacy-protection-section,
.multi-device-section,
.encryption-protocol-section {
    position: relative;
}

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

.feature-media,
.device-media,
.protocol-media,
.privacy-media {
    background: linear-gradient(180deg, #FFFFFF, #F4F7FF);
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 22px;
    box-shadow: var(--shadow);
}

.feature-copy ul,
.article-body ul,
.article-body ol {
    padding-left: 20px;
    margin: 16px 0;
    color: #334155;
}

.feature-copy li,
.article-body li {
    margin: 8px 0;
}

.global-map-card {
    position: relative;
    overflow: hidden;
    background: #FFFFFF;
    border-radius: 32px;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 24px;
}

.global-map-card::before {
    content: "";
    position: absolute;
    inset: 20px;
    border-radius: 26px;
    background:
        radial-gradient(circle at 18% 32%, rgba(41,128,254,0.30) 0 5px, transparent 6px),
        radial-gradient(circle at 52% 46%, rgba(123,78,241,0.28) 0 5px, transparent 6px),
        radial-gradient(circle at 78% 28%, rgba(184,77,218,0.26) 0 5px, transparent 6px),
        linear-gradient(120deg, transparent 0 28%, rgba(41,128,254,0.13) 29%, transparent 30% 54%, rgba(123,78,241,0.12) 55%, transparent 56%);
}

.global-map-card img {
    position: relative;
    z-index: 2;
    margin: 0 auto;
}

.speed-lines {
    display: grid;
    gap: 12px;
    margin: 18px 0;
}

.speed-line {
    padding: 14px;
    border-radius: 16px;
    background: #FFFFFF;
    border: 1px solid var(--line);
}

.speed-line strong {
    display: block;
    color: #111827;
}

.speed-bar {
    display: block;
    height: 8px;
    margin-top: 10px;
    border-radius: 999px;
    background: linear-gradient(90deg, #2980FE, #9B5CF6);
}

.speed-bar.wide { width: 88%; }
.speed-bar.mid { width: 66%; }
.speed-bar.low { width: 48%; }

.privacy-panel,
.safety-panel {
    padding: 24px;
    border-radius: 28px;
    border: 1px solid var(--line);
    background: #FFFFFF;
    box-shadow: var(--shadow);
}

.panel-list {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.panel-list div {
    padding: 14px;
    border-radius: 16px;
    background: #F6F8FC;
    border-left: 4px solid var(--primary);
}

.no-log-policy-section .card-grid,
.card-grid,
.risk-grid,
.faq-grid,
.related-grid {
    display: grid;
    gap: 16px;
}

.info-card,
.risk-card,
.step-card,
.protocol-card,
.page-card,
.check-card {
    padding: 22px;
}

.device-list {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.device-list div {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 15px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #FFFFFF;
}

.device-list span,
.step-num {
    flex: 0 0 auto;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #EEF5FF;
    color: var(--primary);
    font-weight: 800;
}

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

.step-card {
    position: relative;
}

.step-card h3 {
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.faq-item {
    padding: 20px;
}

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

.cta-section {
    color: #FFFFFF;
    padding: 58px 0;
    text-align: center;
    overflow: hidden;
    position: relative;
}

.cta-section::before {
    content: "";
    position: absolute;
    inset: -160px auto auto 50%;
    width: 520px;
    height: 520px;
    transform: translateX(-50%);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.14);
}

.cta-inner {
    position: relative;
    z-index: 2;
    max-width: 760px;
    margin: 0 auto;
}

.cta-section h2 {
    margin: 0 0 12px;
    font-size: clamp(26px, 5vw, 42px);
    letter-spacing: -0.03em;
}

.cta-section p {
    margin: 0 auto 24px;
    color: rgba(255, 255, 255, 0.88);
}

.page-hero {
    padding: 54px 0 40px;
    border-bottom: 1px solid var(--line);
}

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

.page-hero h1 {
    margin: 14px 0 14px;
    font-size: clamp(30px, 6vw, 52px);
    line-height: 1.16;
    letter-spacing: -0.035em;
}

.page-hero p {
    margin: 0;
    color: var(--muted);
    font-size: 17px;
}

.article-body {
    max-width: 900px;
    margin: 0 auto;
}

.article-body p {
    color: #334155;
}

.article-body h2 {
    margin: 34px 0 12px;
    font-size: 26px;
    color: #111827;
}

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

.sidebar {
    display: grid;
    gap: 16px;
}

.sidebar .page-card {
    position: sticky;
    top: 96px;
}

.check-list {
    display: grid;
    gap: 12px;
    margin: 18px 0;
}

.check-card {
    border-left: 4px solid var(--primary);
}

.download-block {
    margin-top: 28px;
    padding: 24px;
    border-radius: 24px;
    background: #F6F8FC;
    border: 1px solid var(--line);
}

.site-footer {
    background: #101827;
    color: #D1D5DB;
    padding-top: 52px;
}

.footer-inner {
    display: grid;
    gap: 30px;
}

.footer-brand p {
    margin: 16px 0 0;
    color: #AAB3C2;
    max-width: 420px;
}

.footer-logo .brand-name {
    color: #FFFFFF;
}

.footer-links {
    display: grid;
    gap: 22px;
}

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

.footer-links a {
    display: block;
    margin: 8px 0;
    color: #AAB3C2;
    font-size: 14px;
}

.footer-links a:hover {
    color: #FFFFFF;
}

.footer-bottom {
    margin-top: 36px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 18px 0;
    color: #9CA3AF;
    font-size: 14px;
}

.footer-bottom p {
    margin: 0;
}

@media (min-width: 640px) {
    .node-overview,
    .card-grid,
    .risk-grid,
    .related-grid,
    .faq-grid,
    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .footer-links {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (min-width: 900px) {
    .nav-toggle {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: flex-end;
        width: auto;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        gap: 2px;
    }
    .site-nav a {
        padding: 8px 10px;
    }
    .hero-grid,
    .feature-grid,
    .split-grid,
    .privacy-grid,
    .device-grid,
    .protocol-grid,
    .page-layout {
        grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    }
    .page-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
    }
    .node-overview {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    .no-log-policy-section .card-grid,
    .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .footer-inner {
        grid-template-columns: 1fr 1.45fr;
        align-items: start;
    }
    .section {
        padding: 84px 0;
    }
    .vpn-network-hero {
        padding: 92px 0 64px;
    }
    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (min-width: 1100px) {
    .site-nav a {
        padding: 9px 13px;
    }
}