* {
    box-sizing: border-box;
}
:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --soft-blue: #eef5ff;
    --line: #e5e7eb;
    --card: #ffffff;
    --deep: #111827;
    --radius: 24px;
    --shadow: 0 18px 45px rgba(31, 41, 55, 0.08);
}
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: #fff;
    line-height: 1.7;
    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: 50;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.85);
}
.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(--deep);
    white-space: nowrap;
}
.logo img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}
.site-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    padding: 12px 16px 18px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 30px rgba(31, 41, 55, 0.08);
}
.site-nav a {
    display: block;
    padding: 12px 10px;
    color: #475467;
    font-size: 15px;
    border-radius: 14px;
}
.site-nav a:hover,
.site-nav a.active {
    color: var(--blue);
    background: var(--soft-blue);
}
.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}
.nav-toggle-label {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: grid;
    place-content: center;
    gap: 5px;
    cursor: pointer;
}
.nav-toggle-label span {
    width: 20px;
    height: 2px;
    background: #344054;
    display: block;
    border-radius: 3px;
}
.nav-toggle:checked ~ .site-nav {
    display: block;
}
.section {
    padding: 64px 0;
}
.section.alt,
.high-speed-section,
.process-section {
    background: var(--light);
}
.section-title {
    margin: 0 0 14px;
    font-size: clamp(28px, 5vw, 46px);
    line-height: 1.2;
    letter-spacing: -0.04em;
    color: var(--deep);
}
.section-lead {
    margin: 0 0 28px;
    color: var(--muted);
    font-size: 17px;
}
.text-link {
    color: var(--blue);
    font-weight: 700;
}
.text-link:hover {
    color: var(--blue-hover);
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    border: 0;
    box-shadow: 0 14px 24px rgba(41, 128, 254, 0.24);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover {
    background: var(--blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 18px 30px rgba(23, 104, 232, 0.26);
}
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    color: #fff;
    background: var(--gradient);
    padding: 74px 0 54px;
}
.vpn-network-hero:before,
.vpn-network-hero:after {
    content: "";
    position: absolute;
    inset: auto;
    border-radius: 999px;
    background: rgba(255, 255, 255, .18);
    filter: blur(3px);
}
.vpn-network-hero:before {
    width: 380px;
    height: 380px;
    right: -140px;
    top: -110px;
}
.vpn-network-hero:after {
    width: 280px;
    height: 280px;
    left: -120px;
    bottom: -120px;
}
.network-lines {
    position: absolute;
    inset: 0;
    opacity: .22;
    background:
      radial-gradient(circle at 18% 28%, rgba(255,255,255,.92) 0 2px, transparent 3px),
      radial-gradient(circle at 82% 30%, rgba(255,255,255,.75) 0 2px, transparent 3px),
      radial-gradient(circle at 70% 76%, rgba(255,255,255,.9) 0 2px, transparent 3px),
      linear-gradient(120deg, transparent 0 16%, rgba(255,255,255,.45) 16% 16.3%, transparent 16.6% 100%),
      linear-gradient(30deg, transparent 0 40%, rgba(255,255,255,.38) 40% 40.2%, transparent 40.5% 100%);
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-copy h1 {
    margin: 0 0 18px;
    font-size: clamp(34px, 8vw, 64px);
    line-height: 1.08;
    letter-spacing: -0.055em;
}
.hero-copy p {
    margin: 0 0 22px;
    color: rgba(255,255,255,.88);
    font-size: 18px;
}
.hero-tags,
.panel-tags,
.service-points,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.hero-tags {
    margin-top: 18px;
}
.hero-tags span,
.panel-tags span,
.inline-tags span,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}
.hero-tags span {
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
}
.hero-visual {
    position: relative;
    min-height: 360px;
    display: grid;
    place-items: center;
}
.hero-device {
    position: relative;
    width: min(430px, 90%);
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.25);
    border-radius: 32px;
    padding: 18px;
    box-shadow: 0 30px 60px rgba(17, 24, 39, .2);
}
.hero-device img {
    border-radius: 26px;
}
.status-card {
    position: absolute;
    background: rgba(255,255,255,.92);
    color: var(--deep);
    border-radius: 18px;
    padding: 12px 14px;
    box-shadow: var(--shadow);
    font-size: 13px;
    font-weight: 800;
    border: 1px solid rgba(255,255,255,.75);
}
.status-card small {
    display: block;
    color: var(--muted);
    font-weight: 600;
}
.card-one { left: 0; top: 42px; }
.card-two { right: 0; top: 92px; }
.card-three { left: 10px; bottom: 58px; }
.card-four { right: 18px; bottom: 20px; }
.node-overview {
    margin-top: -34px;
    position: relative;
    z-index: 2;
}
.node-grid {
    display: grid;
    gap: 16px;
}
.node-card,
.info-card,
.risk-card,
.faq-item,
.step-card,
.feature-card,
.article-card,
.tip-panel,
.protocol-card,
.policy-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.node-card {
    padding: 22px;
}
.node-card .label {
    display: inline-flex;
    padding: 5px 10px;
    border-radius: 999px;
    color: var(--blue);
    background: var(--soft-blue);
    font-size: 12px;
    font-weight: 800;
}
.node-card h2,
.node-card h3,
.info-card h3,
.feature-card h3,
.step-card h3,
.risk-card h3,
.protocol-card h3,
.policy-card h3 {
    margin: 12px 0 8px;
    color: var(--deep);
    line-height: 1.3;
}
.node-card p,
.info-card p,
.feature-card p,
.step-card p,
.risk-card p,
.policy-card p,
.protocol-card p {
    margin: 0 0 12px;
    color: var(--muted);
}
.split-grid {
    display: grid;
    gap: 30px;
    align-items: center;
}
.visual-card {
    border-radius: 32px;
    padding: 18px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.visual-card img {
    border-radius: 24px;
}
.service-points {
    margin: 18px 0 16px;
}
.service-points span {
    padding: 10px 14px;
    background: var(--soft-blue);
    color: #1d4ed8;
    border-radius: 14px;
    font-weight: 800;
    font-size: 14px;
}
.global-nodes-section {
    position: relative;
    overflow: hidden;
    background:
      radial-gradient(circle at 12% 25%, rgba(41,128,254,.12), transparent 28%),
      radial-gradient(circle at 85% 68%, rgba(184,77,218,.12), transparent 30%),
      #fff;
}
.map-panel {
    position: relative;
    min-height: 340px;
    border-radius: 32px;
    padding: 22px;
    background: linear-gradient(135deg, #f9fbff, #eef5ff);
    border: 1px solid #dbeafe;
    overflow: hidden;
}
.map-panel:before {
    content: "";
    position: absolute;
    inset: 30px;
    background:
      radial-gradient(circle at 20% 45%, #2980FE 0 5px, transparent 6px),
      radial-gradient(circle at 52% 25%, #7B4EF1 0 5px, transparent 6px),
      radial-gradient(circle at 70% 60%, #B84DDA 0 5px, transparent 6px),
      radial-gradient(circle at 40% 78%, #2980FE 0 5px, transparent 6px),
      linear-gradient(35deg, transparent 0 35%, rgba(41,128,254,.24) 35% 35.5%, transparent 36% 100%),
      linear-gradient(150deg, transparent 0 42%, rgba(123,78,241,.24) 42% 42.5%, transparent 43% 100%);
    opacity: .72;
}
.map-panel img {
    position: relative;
    z-index: 1;
    width: min(360px, 86%);
    margin: 28px auto 0;
    border-radius: 24px;
}
.node-list {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 12px;
}
.node-list div {
    background: rgba(255,255,255,.82);
    border: 1px solid rgba(255,255,255,.9);
    border-radius: 18px;
    padding: 12px;
    color: var(--text);
}
.speed-cards,
.policy-grid,
.device-grid,
.protocol-grid,
.risk-grid,
.faq-grid,
.article-grid,
.check-grid {
    display: grid;
    gap: 16px;
}
.info-card,
.feature-card,
.step-card,
.risk-card,
.protocol-card,
.policy-card,
.article-card {
    padding: 22px;
}
.info-card strong,
.risk-card strong,
.protocol-card strong {
    color: var(--blue);
}
.privacy-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 32px;
    padding: 24px;
    box-shadow: var(--shadow);
}
.privacy-panel .panel-tags span {
    color: #1d4ed8;
    background: var(--soft-blue);
}
.security-board {
    background: linear-gradient(180deg, #ffffff, #f5f7fb);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 18px;
}
.security-board img {
    border-radius: 22px;
    margin-bottom: 14px;
}
.device-stack {
    display: grid;
    gap: 14px;
}
.device-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
}
.device-card span {
    width: 40px;
    height: 40px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    color: #fff;
    font-weight: 900;
    background: var(--gradient);
}
.process-steps {
    display: grid;
    gap: 16px;
    counter-reset: step;
}
.step-card {
    position: relative;
    overflow: hidden;
}
.step-card .step-num {
    width: 42px;
    height: 42px;
    border-radius: 16px;
    background: var(--blue);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 900;
}
.risk-card {
    border-left: 4px solid var(--blue);
}
.faq-item {
    padding: 20px;
}
.faq-item h3 {
    margin: 0 0 8px;
    color: var(--deep);
}
.faq-item p {
    margin: 0;
    color: var(--muted);
}
.cta-section {
    padding: 70px 0;
    color: #fff;
    text-align: center;
    background: var(--gradient);
    position: relative;
    overflow: hidden;
}
.cta-section:before {
    content: "";
    position: absolute;
    inset: 0;
    opacity: .18;
    background:
      radial-gradient(circle at 22% 35%, #fff 0 2px, transparent 3px),
      radial-gradient(circle at 68% 65%, #fff 0 2px, transparent 3px),
      radial-gradient(circle at 84% 30%, #fff 0 2px, transparent 3px);
}
.cta-section .container {
    position: relative;
    z-index: 1;
}
.cta-section h2 {
    margin: 0 0 14px;
    font-size: clamp(28px, 6vw, 46px);
}
.cta-section p {
    margin: 0 auto 24px;
    max-width: 700px;
    color: rgba(255,255,255,.88);
}
.page-hero {
    padding: 62px 0 36px;
    background: linear-gradient(180deg, #f6f9ff 0%, #ffffff 100%);
}
.page-hero .badge {
    color: var(--blue);
    background: var(--soft-blue);
    margin-bottom: 12px;
}
.page-hero h1 {
    margin: 0 0 14px;
    font-size: clamp(30px, 7vw, 54px);
    line-height: 1.15;
    letter-spacing: -0.045em;
    color: var(--deep);
}
.page-hero p {
    margin: 0;
    max-width: 760px;
    color: var(--muted);
    font-size: 18px;
}
.content-layout {
    display: grid;
    gap: 24px;
    padding: 34px 0 70px;
}
.article-card h2 {
    margin: 0 0 12px;
    color: var(--deep);
}
.article-card p,
.article-card li {
    color: var(--muted);
}
.article-card ul,
.article-card ol {
    margin: 12px 0 0;
    padding-left: 20px;
}
.tip-panel {
    padding: 22px;
    background: linear-gradient(180deg, #ffffff, #f7fbff);
}
.tip-panel h2,
.tip-panel h3 {
    margin-top: 0;
}
.aside-links {
    display: grid;
    gap: 10px;
}
.aside-links a {
    display: block;
    padding: 12px 14px;
    border-radius: 14px;
    background: var(--soft-blue);
    color: #1d4ed8;
    font-weight: 700;
}
.download-page .download-wrap {
    max-width: 820px;
    margin: 0 auto;
    text-align: center;
}
.steps-list {
    display: grid;
    gap: 14px;
    margin-top: 26px;
    text-align: left;
}
.steps-list div {
    padding: 18px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
}
.site-footer {
    background: #111827;
    color: #d1d5db;
    padding: 48px 0 22px;
}
.footer-grid {
    display: grid;
    gap: 26px;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    margin-bottom: 12px;
}
.footer-brand img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}
.site-footer h2 {
    color: #fff;
    margin: 0 0 12px;
    font-size: 16px;
}
.site-footer a {
    display: block;
    color: #d1d5db;
    margin: 8px 0;
}
.site-footer a:hover {
    color: #fff;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.12);
    margin-top: 34px;
    padding-top: 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: #9ca3af;
    font-size: 14px;
}
@media (min-width: 680px) {
    .node-grid,
    .policy-grid,
    .device-grid,
    .protocol-grid,
    .risk-grid,
    .faq-grid,
    .check-grid,
    .speed-cards {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}
@media (min-width: 960px) {
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .site-nav a {
        display: inline-flex;
        padding: 9px 10px;
        font-size: 14px;
    }
    .nav-toggle-label {
        display: none;
    }
    .vpn-network-hero {
        padding: 96px 0 76px;
    }
    .hero-grid,
    .split-grid,
    .content-layout {
        grid-template-columns: 1.05fr .95fr;
    }
    .node-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    .policy-grid,
    .protocol-grid,
    .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .device-grid,
    .speed-cards,
    .faq-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .footer-grid {
        grid-template-columns: 1.3fr 1fr 1fr 1fr;
    }
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
    .section {
        padding: 88px 0;
    }
}
@media (min-width: 1160px) {
    .site-nav a {
        padding: 10px 13px;
    }
}