:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1F2937;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E5EAF2;
    --white: #FFFFFF;
    --soft-blue: #F1F6FF;
    --shadow: 0 18px 48px rgba(27, 54, 120, 0.10);
    --radius: 28px;
}
* {
    box-sizing: border-box;
}
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: #FFFFFF;
    line-height: 1.75;
    overflow-x: hidden;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
a {
    color: inherit;
    text-decoration: none;
}
p {
    margin: 0 0 16px;
    color: var(--muted);
}
h1, h2, h3 {
    margin: 0;
    line-height: 1.18;
    color: #101828;
}
h1 {
    font-size: clamp(34px, 8vw, 62px);
    letter-spacing: -1.6px;
}
h2 {
    font-size: clamp(26px, 4vw, 42px);
    letter-spacing: -0.8px;
}
h3 {
    font-size: 20px;
}
.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}
.narrow {
    width: min(860px, calc(100% - 32px));
}
.section-pad {
    padding: 72px 0;
}
.soft-bg {
    background: linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 100%);
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.92);
    border-bottom: 1px solid rgba(229,234,242,0.9);
    backdrop-filter: blur(18px);
}
.nav-shell {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 70px;
    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;
    color: #101828;
    white-space: nowrap;
}
.brand img,
.footer-brand img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 8px 20px rgba(41,128,254,0.18);
}
.site-nav {
    position: absolute;
    top: 70px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
}
.site-nav a {
    padding: 11px 12px;
    border-radius: 14px;
    color: #344054;
    font-size: 15px;
    font-weight: 600;
}
.site-nav a:hover,
.site-nav a.active {
    color: var(--blue);
    background: #F2F7FF;
}
.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-items: center;
    gap: 4px;
    padding: 10px;
    cursor: pointer;
}
.nav-toggle-label span {
    width: 20px;
    height: 2px;
    background: #1F2937;
    display: block;
    border-radius: 2px;
}
.nav-toggle:checked ~ .site-nav {
    display: flex;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 28px;
    border-radius: 999px;
    background: #2980FE;
    color: #FFFFFF;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(41,128,254,0.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(23,104,232,0.3);
}
.text-link {
    display: inline-flex;
    align-items: center;
    color: var(--blue);
    font-weight: 800;
    margin-top: 10px;
}
.center-link {
    display: flex;
    width: fit-content;
    margin: 26px auto 0;
}
.vpn-saas-hero {
    position: relative;
    padding: 54px 0 72px;
    color: #fff;
    background: var(--gradient);
    overflow: hidden;
}
.vpn-saas-hero::after {
    content: "";
    position: absolute;
    left: -8%;
    right: -8%;
    bottom: -84px;
    height: 140px;
    background: #fff;
    transform: rotate(-3.5deg);
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 38px;
    align-items: center;
}
.hero-copy h1,
.hero-copy p {
    color: #fff;
}
.hero-copy p {
    font-size: 18px;
    max-width: 680px;
    color: rgba(255,255,255,0.88);
}
.eyebrow,
.section-kicker,
.page-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    margin-bottom: 14px;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--blue);
    background: #EDF5FF;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .2px;
}
.eyebrow {
    color: #fff;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.28);
}
.section-kicker.light {
    color: #fff;
    background: rgba(255,255,255,0.18);
}
.trust-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}
.trust-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    border: 1px solid rgba(255,255,255,0.28);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
}
.hero-visual {
    min-height: 360px;
    display: grid;
    place-items: center;
}
.device-card {
    position: relative;
    width: min(420px, 90vw);
    padding: 20px;
    border-radius: 36px;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.24);
    box-shadow: 0 30px 90px rgba(17,24,39,0.24);
}
.device-card img {
    border-radius: 30px;
    background: #fff;
    box-shadow: 0 22px 60px rgba(17,24,39,0.22);
}
.float-card {
    position: absolute;
    padding: 10px 14px;
    border-radius: 16px;
    background: rgba(255,255,255,0.96);
    color: #101828;
    font-weight: 800;
    box-shadow: 0 14px 34px rgba(22, 34, 75, 0.18);
    font-size: 14px;
}
.card-one { left: -8px; top: 44px; }
.card-two { right: -10px; top: 100px; }
.card-three { left: 8px; bottom: 82px; }
.card-four { right: 22px; bottom: 30px; }
.section-head {
    text-align: center;
    max-width: 780px;
    margin: 0 auto 34px;
}
.section-head.left {
    text-align: left;
    margin-left: 0;
}
.highlight-grid {
    display: grid;
    gap: 16px;
}
.highlight-card,
.policy-grid article,
.risk-grid article,
.info-card-grid article,
.checklist-panel article,
.mini-card-list article {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 12px 36px rgba(31,41,55,0.05);
}
.highlight-card span {
    display: inline-flex;
    color: var(--blue);
    font-weight: 900;
    margin-bottom: 12px;
}
.highlight-card h3,
.policy-grid h3,
.risk-grid h3 {
    margin-bottom: 10px;
}
.highlight-card a,
.process-steps a,
.related-links a,
.side-panel a,
.risk-grid a {
    color: var(--blue);
    font-weight: 800;
}
.split-panel,
.speed-layout,
.nodes-grid,
.tech-panel,
.two-column,
.article-split,
.guide-layout {
    display: grid;
    gap: 28px;
    align-items: center;
}
.split-panel,
.tech-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}
.split-copy,
.speed-copy {
    padding: 8px;
}
.feature-list {
    padding: 0;
    margin: 18px 0;
    list-style: none;
}
.feature-list li {
    position: relative;
    padding-left: 26px;
    margin-bottom: 10px;
    color: #475467;
}
.feature-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 5px rgba(41,128,254,0.12);
}
.panel-image img,
.device-showcase img,
.large-product-card img,
.nodes-visual img,
.protocol-card img,
.privacy-content img {
    border-radius: 28px;
    background: #F8FAFF;
    border: 1px solid var(--line);
}
.large-product-card {
    position: relative;
    padding: 18px;
    border-radius: 32px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.speed-badge {
    position: absolute;
    right: 26px;
    bottom: 26px;
    padding: 10px 14px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
}
.mini-metrics {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0 8px;
}
.mini-metrics span,
.protocol-lines span {
    padding: 9px 12px;
    border-radius: 999px;
    background: #EEF5FF;
    color: var(--blue);
    font-weight: 800;
    font-size: 14px;
}
.node-card-stack {
    display: grid;
    gap: 12px;
    margin: 20px 0;
}
.node-card-stack div {
    padding: 18px;
    border-radius: 22px;
    background: #F7FAFF;
    border: 1px solid var(--line);
}
.privacy-panel {
    padding: 24px;
    border-radius: 34px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.privacy-content {
    display: grid;
    gap: 22px;
    align-items: center;
}
.privacy-cards {
    display: grid;
    gap: 12px;
}
.privacy-cards div {
    padding: 18px;
    border-radius: 22px;
    background: #F7FAFF;
    border: 1px solid var(--line);
}
.policy-grid,
.info-card-grid,
.risk-grid {
    display: grid;
    gap: 16px;
}
.tech-panel {
    background: linear-gradient(135deg, #FFFFFF 0%, #F5F8FF 100%);
}
.protocol-card {
    display: grid;
    gap: 16px;
}
.protocol-lines {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.process-steps {
    display: grid;
    gap: 16px;
}
.process-steps article {
    padding: 22px;
    border-radius: 24px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 12px 32px rgba(31,41,55,0.05);
}
.process-steps span {
    display: inline-flex;
    margin-bottom: 10px;
    color: var(--blue);
    font-weight: 900;
}
.safety-panel .risk-grid article {
    border-left: 4px solid var(--blue);
}
.faq-list {
    display: grid;
    gap: 14px;
}
.faq-list details {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 18px 20px;
    box-shadow: 0 10px 24px rgba(31,41,55,0.04);
}
.faq-list summary {
    cursor: pointer;
    font-weight: 900;
    color: #101828;
}
.faq-list p {
    margin-top: 12px;
}
.cta-section {
    padding: 80px 0;
    background: #fff;
}
.cta-card {
    text-align: center;
    padding: 42px 22px;
    border-radius: 36px;
    color: #fff;
    background: var(--gradient);
    box-shadow: 0 24px 70px rgba(53,88,242,0.25);
}
.cta-card h2,
.cta-card p {
    color: #fff;
}
.cta-card p {
    max-width: 640px;
    margin: 14px auto 24px;
    color: rgba(255,255,255,0.88);
}
.page-hero {
    padding: 74px 0 64px;
    background: linear-gradient(180deg, #F4F8FF 0%, #FFFFFF 100%);
    text-align: center;
}
.page-hero.simple {
    background: linear-gradient(135deg, #F2F7FF 0%, #FFFFFF 80%);
}
.page-hero p {
    font-size: 18px;
    max-width: 760px;
    margin: 16px auto 24px;
}
.download-hero {
    background: var(--gradient);
}
.download-hero h1,
.download-hero p {
    color: #fff;
}
.download-hero .page-badge {
    color: #fff;
    background: rgba(255,255,255,0.18);
}
.content-section {
    padding: 64px 0 84px;
}
.rich-content {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 26px;
    box-shadow: var(--shadow);
}
.rich-content h2 {
    font-size: 26px;
    margin: 22px 0 12px;
}
.rich-content h2:first-child {
    margin-top: 0;
}
.side-panel,
.checklist-panel,
.related-panel,
.step-panel,
.safety-note {
    background: #F8FAFF;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
}
.side-panel ul {
    margin: 14px 0 20px;
    padding-left: 20px;
    color: #475467;
}
.mini-card-list,
.checklist-panel,
.download-layout {
    display: grid;
    gap: 16px;
}
.related-panel {
    margin-top: 26px;
}
.related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 14px;
}
.related-links a {
    padding: 10px 14px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line);
}
.info-card-grid.wide {
    margin-top: 22px;
}
.number-list {
    margin: 18px 0 0;
    padding-left: 24px;
    color: #475467;
}
.number-list li {
    margin-bottom: 14px;
}
.site-footer {
    background: #101828;
    color: #D0D5DD;
    padding: 58px 0 0;
}
.footer-grid {
    display: grid;
    gap: 30px;
}
.site-footer h3,
.footer-brand span {
    color: #fff;
}
.site-footer p {
    color: #AAB4C4;
}
.site-footer a {
    display: block;
    color: #C8D1E2;
    margin: 8px 0;
}
.site-footer a:hover {
    color: #fff;
}
.footer-bottom {
    margin-top: 36px;
    padding: 18px 16px;
    text-align: center;
    color: #98A2B3;
    border-top: 1px solid rgba(255,255,255,0.08);
}
@media (min-width: 700px) {
    .highlight-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .policy-grid,
    .info-card-grid,
    .risk-grid,
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1.4fr 1fr 1fr 1fr;
    }
}
@media (min-width: 960px) {
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 2px;
        padding: 0;
        background: transparent;
        border: 0;
        border-radius: 0;
        box-shadow: none;
    }
    .site-nav a {
        padding: 9px 10px;
        font-size: 14px;
    }
    .nav-toggle-label {
        display: none;
    }
    .vpn-saas-hero {
        padding: 84px 0 120px;
    }
    .hero-grid {
        grid-template-columns: 1.04fr .96fr;
        min-height: 560px;
    }
    .highlight-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .split-panel,
    .speed-layout,
    .nodes-grid,
    .tech-panel,
    .two-column,
    .article-split,
    .guide-layout,
    .download-layout {
        grid-template-columns: 1fr 1fr;
    }
    .split-panel {
        padding: 38px;
    }
    .reverse .split-copy {
        order: 2;
    }
    .reverse .split-image {
        order: 1;
    }
    .privacy-content {
        grid-template-columns: .86fr 1.14fr;
    }
    .risk-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(3, 1fr);
    }
    .policy-grid,
    .info-card-grid.wide {
        grid-template-columns: repeat(3, 1fr);
    }
    .page-hero {
        padding: 96px 0 82px;
    }
}
@media (min-width: 1120px) {
    .site-nav a {
        padding: 9px 12px;
    }
}
@media (max-width: 420px) {
    .container,
    .narrow {
        width: min(100% - 24px, 1120px);
    }
    .section-pad {
        padding: 52px 0;
    }
    .float-card {
        position: static;
        display: inline-flex;
        margin: 8px 6px 0 0;
    }
    .device-card {
        padding: 14px;
    }
    .download-btn {
        width: 100%;
    }
}