* {
    box-sizing: border-box;
}
:root {
    --brand-blue: #2980FE;
    --brand-blue-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #202636;
    --muted: #657085;
    --soft: #F5F7FB;
    --soft-blue: #F1F6FF;
    --border: #E6EAF2;
    --card: #FFFFFF;
    --shadow: 0 18px 45px rgba(30, 55, 120, 0.10);
    --radius-xl: 34px;
    --radius-lg: 26px;
    --radius-md: 18px;
}
html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    color: var(--text);
    background: #FFFFFF;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.75;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
.container {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(230, 234, 242, 0.9);
}
.nav-shell {
    width: min(100% - 28px, 1180px);
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: .02em;
}
.brand-logo, .footer-logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 10px 24px rgba(41, 128, 254, .18);
}
.brand-name {
    font-size: 19px;
}
.site-nav {
    display: none;
    position: absolute;
    left: 14px;
    right: 14px;
    top: 72px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.site-nav.is-open {
    display: grid;
    gap: 6px;
}
.nav-link {
    padding: 10px 12px;
    border-radius: 12px;
    color: #3D465B;
    font-size: 15px;
}
.nav-link:hover, .nav-link.active {
    color: var(--brand-blue);
    background: var(--soft-blue);
}
.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #fff;
    display: inline-grid;
    place-content: center;
    gap: 4px;
}
.nav-toggle span {
    width: 18px;
    height: 2px;
    background: #1F2937;
    border-radius: 999px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--brand-blue);
    color: #fff;
    font-weight: 750;
    box-shadow: 0 16px 30px rgba(41, 128, 254, .28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    border: 0;
    white-space: nowrap;
}
.download-btn:hover {
    background: var(--brand-blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(23, 104, 232, .32);
}
.vpn-saas-hero {
    position: relative;
    margin: 26px auto 0;
    width: min(100% - 28px, 1180px);
    overflow: hidden;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    background: var(--gradient);
    color: #fff;
    isolation: isolate;
}
.vpn-saas-hero::before {
    content: "";
    position: absolute;
    inset: auto -12% -28% 32%;
    height: 58%;
    background: rgba(255, 255, 255, .16);
    transform: skewY(-10deg);
    border-radius: 60px;
    z-index: -1;
}
.vpn-saas-hero::after {
    content: "";
    position: absolute;
    width: 300px;
    height: 300px;
    right: -90px;
    top: -110px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .18);
    filter: blur(4px);
    z-index: -1;
}
.hero-inner {
    display: grid;
    gap: 34px;
    padding: 54px 24px;
}
.hero-copy h1 {
    margin: 0 0 16px;
    font-size: clamp(34px, 8vw, 66px);
    line-height: 1.05;
    letter-spacing: -.045em;
}
.hero-copy p {
    margin: 0 0 24px;
    max-width: 620px;
    color: rgba(255, 255, 255, .88);
    font-size: 17px;
}
.hero-tags, .floating-tags, .tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.hero-tags span, .floating-tags span, .tag-row span {
    border-radius: 999px;
    padding: 8px 12px;
    background: rgba(255, 255, 255, .16);
    border: 1px solid rgba(255, 255, 255, .22);
    font-size: 13px;
    color: rgba(255, 255, 255, .92);
}
.hero-visual {
    position: relative;
    min-height: 310px;
    display: grid;
    place-items: center;
}
.product-orbit {
    position: relative;
    width: min(100%, 430px);
    padding: 18px;
    border-radius: 36px;
    background: rgba(255, 255, 255, .16);
    border: 1px solid rgba(255, 255, 255, .28);
    box-shadow: 0 30px 70px rgba(10, 20, 80, .20);
}
.product-orbit img {
    width: 100%;
    border-radius: 28px;
}
.float-card {
    position: absolute;
    padding: 10px 13px;
    border-radius: 16px;
    background: rgba(255, 255, 255, .94);
    color: #253047;
    box-shadow: var(--shadow);
    font-weight: 750;
    font-size: 13px;
}
.float-card.one { top: 12%; left: 0; }
.float-card.two { right: 0; top: 34%; }
.float-card.three { left: 8%; bottom: 14%; }
.float-card.four { right: 8%; bottom: -10px; }
.section {
    padding: 58px 0;
}
.section-soft {
    background: var(--soft);
}
.section-head {
    margin-bottom: 28px;
}
.section-kicker, .category-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--brand-blue);
    background: var(--soft-blue);
    font-size: 13px;
    font-weight: 760;
}
.section-head h2, .section-title {
    margin: 14px 0 10px;
    font-size: clamp(27px, 5vw, 42px);
    line-height: 1.18;
    letter-spacing: -.025em;
}
.section-head p, .lead, .muted {
    color: var(--muted);
}
.product-highlights {
    margin-top: -34px;
    position: relative;
    z-index: 3;
}
.highlight-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.highlight-card, .info-card, .risk-card, .faq-card, .step-card, .policy-card, .protocol-card, .side-card, .content-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 32px rgba(30, 55, 120, .07);
}
.highlight-card {
    padding: 22px;
}
.highlight-tag {
    color: var(--brand-blue);
    font-size: 13px;
    font-weight: 800;
}
.highlight-card h3, .info-card h3, .risk-card h3, .step-card h3, .policy-card h3, .protocol-card h3 {
    margin: 10px 0 8px;
    font-size: 20px;
}
.highlight-card p, .info-card p, .risk-card p, .step-card p, .policy-card p, .protocol-card p {
    color: var(--muted);
    margin: 0 0 14px;
}
.text-link {
    color: var(--brand-blue);
    font-weight: 760;
}
.split-panel, .image-panel, .privacy-panel, .device-panel, .speed-panel, .nodes-panel, .protocol-panel {
    display: grid;
    gap: 24px;
    align-items: center;
}
.feature-copy {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 28px;
    box-shadow: var(--shadow);
}
.feature-copy h2 {
    margin: 10px 0 14px;
    font-size: clamp(26px, 5vw, 42px);
    line-height: 1.18;
}
.feature-copy p {
    color: var(--muted);
}
.feature-list, .check-list, .number-list {
    padding: 0;
    margin: 18px 0;
    list-style: none;
    display: grid;
    gap: 10px;
}
.feature-list li, .check-list li, .number-list li {
    position: relative;
    padding-left: 24px;
    color: #3B4559;
}
.feature-list li::before, .check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .72em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--brand-blue);
}
.number-list {
    counter-reset: item;
}
.number-list li {
    counter-increment: item;
}
.number-list li::before {
    content: counter(item);
    position: absolute;
    left: 0;
    top: 4px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-size: 11px;
    color: #fff;
    background: var(--brand-blue);
}
.visual-card {
    position: relative;
    padding: 16px;
    border-radius: var(--radius-xl);
    background: linear-gradient(180deg, #FFFFFF, #F4F7FF);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.visual-card img {
    width: 100%;
    border-radius: 24px;
}
.high-speed-section {
    background: linear-gradient(180deg, #F6F9FF 0%, #FFFFFF 100%);
}
.speed-panel .feature-copy {
    box-shadow: none;
}
.metric-strip {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 18px;
}
.metric-item {
    padding: 16px;
    border-radius: 18px;
    background: var(--soft-blue);
    color: #30405D;
}
.metric-item strong {
    display: block;
    color: var(--brand-blue);
    font-size: 18px;
}
.nodes-panel {
    background: #fff;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    padding: 20px;
    box-shadow: var(--shadow);
}
.node-cards, .privacy-cards, .policy-grid, .protocol-grid, .risk-grid, .faq-grid, .related-grid, .mini-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.info-card, .policy-card, .protocol-card, .risk-card, .faq-card, .side-card, .content-card {
    padding: 22px;
}
.info-card {
    border-top: 4px solid var(--brand-blue);
}
.privacy-protection-section {
    background: var(--soft);
}
.privacy-panel {
    padding: 22px;
    border-radius: var(--radius-xl);
    background: #fff;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.no-log-policy-section .policy-card {
    min-height: 190px;
}
.multi-device-section {
    background: linear-gradient(180deg, #FFFFFF 0%, #F7F9FD 100%);
}
.device-panel .visual-card {
    background: var(--gradient);
}
.device-panel .visual-card img {
    background: rgba(255,255,255,.15);
}
.protocol-panel {
    border-radius: var(--radius-xl);
    padding: 22px;
    background: #101827;
    color: #fff;
}
.protocol-panel .lead, .protocol-panel p, .protocol-panel li {
    color: rgba(255,255,255,.78);
}
.protocol-grid .protocol-card {
    background: rgba(255,255,255,.08);
    border-color: rgba(255,255,255,.14);
}
.protocol-card h3 {
    color: #fff;
}
.process-steps {
    display: grid;
    gap: 16px;
}
.step-card {
    padding: 22px;
    position: relative;
    overflow: hidden;
}
.step-number {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    color: #fff;
    background: var(--brand-blue);
    font-weight: 800;
}
.risk-card {
    border-left: 4px solid var(--brand-blue);
}
.risk-card strong {
    display: block;
    margin: 10px 0 4px;
}
.faq-card h3 {
    margin: 0 0 8px;
    font-size: 18px;
}
.cta-section {
    padding: 70px 0;
}
.cta-box {
    text-align: center;
    border-radius: var(--radius-xl);
    background: var(--gradient);
    color: #fff;
    padding: 46px 22px;
    position: relative;
    overflow: hidden;
}
.cta-box::before {
    content: "";
    position: absolute;
    inset: -40% auto auto -12%;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: rgba(255,255,255,.16);
}
.cta-box h2 {
    margin: 0 0 12px;
    font-size: clamp(28px, 6vw, 44px);
}
.cta-box p {
    margin: 0 auto 24px;
    max-width: 720px;
    color: rgba(255,255,255,.86);
}
.page-hero {
    background: linear-gradient(180deg, #F4F7FF, #FFFFFF);
    padding: 44px 0 26px;
}
.page-hero .container {
    display: grid;
    gap: 18px;
}
.page-hero h1 {
    margin: 12px 0 10px;
    font-size: clamp(32px, 7vw, 56px);
    line-height: 1.1;
    letter-spacing: -.035em;
}
.page-hero p {
    max-width: 820px;
    color: var(--muted);
    font-size: 17px;
}
.page-layout {
    display: grid;
    gap: 22px;
    align-items: start;
}
.article-body {
    display: grid;
    gap: 18px;
}
.article-body p {
    margin: 0;
    color: #536078;
}
.article-body h2 {
    margin: 6px 0 0;
    font-size: 26px;
}
.side-stack {
    display: grid;
    gap: 16px;
}
.notice-box {
    padding: 20px;
    border-radius: var(--radius-lg);
    background: var(--soft-blue);
    border: 1px solid #DDE9FF;
    color: #3F4A61;
}
.simple-cta {
    padding: 22px;
    border-radius: var(--radius-lg);
    background: #fff;
    border: 1px solid var(--border);
    box-shadow: 0 12px 32px rgba(30,55,120,.08);
    display: grid;
    gap: 14px;
    align-items: center;
}
.download-steps {
    counter-reset: step;
    display: grid;
    gap: 16px;
}
.download-step {
    counter-increment: step;
    padding: 22px;
    border-radius: var(--radius-lg);
    background: #fff;
    border: 1px solid var(--border);
}
.download-step::before {
    content: "0" counter(step);
    display: inline-flex;
    color: var(--brand-blue);
    font-weight: 800;
    margin-bottom: 8px;
}
.site-footer {
    background: #111827;
    color: rgba(255,255,255,.78);
    padding-top: 46px;
}
.footer-grid {
    display: grid;
    gap: 24px;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
}
.site-footer h3 {
    color: #fff;
    margin: 0 0 10px;
    font-size: 16px;
}
.site-footer a {
    display: block;
    margin: 8px 0;
    color: rgba(255,255,255,.74);
}
.site-footer a:hover {
    color: #fff;
}
.footer-bottom {
    margin-top: 34px;
    padding: 18px;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,.10);
    font-size: 14px;
    color: rgba(255,255,255,.62);
}
@media (min-width: 640px) {
    .highlight-grid, .node-cards, .privacy-cards, .policy-grid, .protocol-grid, .risk-grid, .faq-grid, .related-grid, .mini-grid, .process-steps, .metric-strip {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .simple-cta {
        grid-template-columns: 1fr auto;
    }
}
@media (min-width: 960px) {
    .nav-toggle { display: none; }
    .site-nav {
        display: flex;
        position: static;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        align-items: center;
        gap: 2px;
    }
    .nav-link {
        padding: 10px 11px;
        font-size: 14px;
    }
    .hero-inner {
        grid-template-columns: 1.05fr .95fr;
        align-items: center;
        padding: 78px 62px 82px;
    }
    .highlight-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    .split-panel, .image-panel, .speed-panel, .nodes-panel, .privacy-panel, .device-panel, .protocol-panel {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .privacy-cards, .policy-grid, .protocol-grid, .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .faq-grid, .related-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .page-layout {
        grid-template-columns: minmax(0, 1fr) 330px;
    }
    .footer-grid {
        grid-template-columns: 1.4fr repeat(3, 1fr);
    }
    .section {
        padding: 78px 0;
    }
}
@media (min-width: 1160px) {
    .nav-link { padding: 10px 14px; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1160px); }
    .hero-inner { padding: 42px 18px; }
    .download-btn { width: 100%; }
    .float-card { font-size: 12px; padding: 8px 10px; }
    .feature-copy, .privacy-panel, .protocol-panel { padding: 22px; }
}