:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #202838;
    --muted: #677184;
    --light: #F5F7FB;
    --lighter: #EEF4FF;
    --border: #E5EAF3;
    --white: #FFFFFF;
    --shadow: 0 18px 45px rgba(32, 40, 56, .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;
    background: #fff;
    color: var(--text);
    line-height: 1.75;
    overflow-x: hidden;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
a {
    color: inherit;
    text-decoration: none;
}
p {
    color: var(--muted);
    margin: 0 0 16px;
}
h1, h2, h3 {
    color: var(--text);
    line-height: 1.2;
    margin: 0 0 16px;
}
h1 {
    font-size: clamp(34px, 7vw, 64px);
    letter-spacing: -1.6px;
}
h2 {
    font-size: clamp(28px, 4.5vw, 46px);
    letter-spacing: -1px;
}
h3 {
    font-size: 21px;
}
.container {
    width: min(1120px, calc(100% - 36px));
    margin: 0 auto;
}
.section {
    padding: 72px 0;
}
.section-soft {
    background: var(--light);
}
.section-head {
    max-width: 760px;
    margin: 0 auto 34px;
    text-align: center;
}
.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, .10);
    color: var(--blue);
    font-weight: 700;
    font-size: 13px;
    margin-bottom: 14px;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, .92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(229, 234, 243, .85);
}
.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    font-size: 19px;
    font-weight: 800;
    color: #182235;
    white-space: nowrap;
}
.logo img {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    object-fit: cover;
}
.nav-toggle {
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text);
    border-radius: 14px;
    width: 44px;
    height: 44px;
    font-size: 22px;
    cursor: pointer;
}
.site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 18px;
    right: 18px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: var(--shadow);
}
.site-nav.open {
    display: grid;
    grid-template-columns: 1fr;
    gap: 6px;
}
.site-nav a {
    padding: 11px 12px;
    border-radius: 13px;
    color: #3B4658;
    font-weight: 700;
    font-size: 14px;
}
.site-nav a.active,
.site-nav a:hover {
    background: var(--lighter);
    color: var(--blue);
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(41, 128, 254, .22);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(41, 128, 254, .28);
}
.text-link {
    color: var(--blue);
    font-weight: 800;
}
.vpn-saas-hero {
    position: relative;
    padding: 48px 0 72px;
    overflow: hidden;
    background: #fff;
}
.vpn-saas-hero::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 78%;
    background: var(--gradient);
    clip-path: polygon(0 0, 100% 0, 100% 78%, 0 100%);
    z-index: 0;
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-copy {
    color: #fff;
    padding-top: 18px;
}
.hero-copy h1,
.hero-copy p {
    color: #fff;
}
.hero-copy p {
    font-size: 17px;
    opacity: .93;
}
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    margin: 24px 0;
}
.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.hero-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
    color: #fff;
    font-weight: 700;
    font-size: 13px;
}
.hero-visual {
    position: relative;
    min-height: 420px;
}
.product-card {
    position: relative;
    border-radius: 36px;
    padding: 22px;
    background: rgba(255, 255, 255, .72);
    box-shadow: var(--shadow);
    backdrop-filter: blur(12px);
}
.product-card img {
    width: 100%;
    border-radius: 28px;
    background: #fff;
}
.float-card {
    position: absolute;
    padding: 10px 14px;
    border-radius: 16px;
    background: #fff;
    color: #23304A;
    font-weight: 800;
    box-shadow: 0 14px 34px rgba(26, 40, 68, .14);
    border: 1px solid rgba(229, 234, 243, .9);
    font-size: 13px;
}
.float-card.one { left: 0; top: 10%; }
.float-card.two { right: 0; top: 22%; }
.float-card.three { left: 8%; bottom: 12%; }
.float-card.four { right: 6%; bottom: 4%; }
.product-highlights {
    margin-top: -36px;
    position: relative;
    z-index: 2;
}
.highlight-grid {
    display: grid;
    gap: 16px;
}
.highlight-card,
.info-card,
.risk-card,
.faq-item,
.step-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 12px 30px rgba(32, 40, 56, .06);
}
.highlight-card small {
    display: inline-block;
    color: var(--blue);
    font-weight: 900;
    margin-bottom: 10px;
}
.highlight-card h3,
.info-card h3,
.risk-card h3,
.step-card h3 {
    margin-bottom: 10px;
}
.feature-split,
.vpn-connection-section,
.high-speed-section,
.global-nodes-section,
.multi-device-section {
    display: grid;
    gap: 26px;
    align-items: center;
}
.feature-panel {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 32px;
    padding: 28px;
    box-shadow: var(--shadow);
}
.feature-panel.light {
    background: linear-gradient(180deg, #fff 0%, #F7FAFF 100%);
}
.feature-image {
    background: linear-gradient(180deg, #F8FAFF 0%, #EEF4FF 100%);
    border: 1px solid var(--border);
    border-radius: 34px;
    padding: 18px;
    box-shadow: var(--shadow);
}
.feature-image img {
    border-radius: 24px;
    margin: 0 auto;
}
.feature-list,
.clean-list {
    padding: 0;
    margin: 20px 0;
    list-style: none;
    display: grid;
    gap: 12px;
}
.feature-list li,
.clean-list li {
    position: relative;
    padding-left: 28px;
    color: #465267;
}
.feature-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 5px rgba(41, 128, 254, .11);
}
.high-speed-section {
    background: #F7FAFF;
    border-radius: 36px;
    padding: 26px;
    border: 1px solid var(--border);
}
.speed-metrics {
    display: grid;
    gap: 14px;
    margin-top: 20px;
}
.metric {
    padding: 18px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--border);
}
.metric strong {
    display: block;
    color: var(--text);
    font-size: 18px;
}
.privacy-protection-section {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 36px;
    padding: 28px;
    box-shadow: var(--shadow);
}
.privacy-grid,
.no-log-policy-section,
.encryption-protocol-section,
.risk-grid,
.faq-grid,
.guide-grid,
.card-grid {
    display: grid;
    gap: 18px;
}
.no-log-policy-section .info-card {
    border-top: 4px solid var(--blue);
}
.multi-device-devices {
    display: grid;
    gap: 14px;
}
.device-pill {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 16px 18px;
    border-radius: 18px;
    background: #F7FAFF;
    border: 1px solid var(--border);
    font-weight: 800;
}
.encryption-protocol-section {
    background: #101B3D;
    color: #fff;
    border-radius: 34px;
    padding: 28px;
    overflow: hidden;
    position: relative;
}
.encryption-protocol-section h2,
.encryption-protocol-section h3,
.encryption-protocol-section p,
.encryption-protocol-section li {
    color: #fff;
}
.encryption-protocol-section::after {
    content: "";
    position: absolute;
    right: -90px;
    top: -90px;
    width: 240px;
    height: 240px;
    background: rgba(41, 128, 254, .25);
    border-radius: 50%;
}
.tech-card {
    position: relative;
    z-index: 1;
    padding: 22px;
    border: 1px solid rgba(255,255,255,.16);
    background: rgba(255,255,255,.08);
    border-radius: 22px;
}
.process-steps {
    display: grid;
    gap: 16px;
}
.step-card {
    position: relative;
}
.step-num {
    display: inline-flex;
    width: 34px;
    height: 34px;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--blue);
    color: #fff;
    font-weight: 900;
    margin-bottom: 14px;
}
.safety-panel {
    background: linear-gradient(180deg, #FFFFFF 0%, #F7FAFF 100%);
    border: 1px solid var(--border);
    border-radius: 34px;
    padding: 28px;
    box-shadow: var(--shadow);
}
.risk-card {
    border-left: 4px solid var(--blue);
}
.faq-item h3 {
    font-size: 18px;
}
.cta-section {
    text-align: center;
    padding: 72px 0;
    background: var(--gradient);
    color: #fff;
}
.cta-section h2,
.cta-section p {
    color: #fff;
}
.cta-inner {
    width: min(760px, calc(100% - 36px));
    margin: 0 auto;
}
.page-hero {
    padding: 58px 0 42px;
    background:
        radial-gradient(circle at 10% 15%, rgba(41,128,254,.14), transparent 28%),
        linear-gradient(180deg, #F7FAFF 0%, #fff 100%);
}
.page-hero .container {
    max-width: 900px;
}
.page-hero h1 {
    font-size: clamp(34px, 6vw, 56px);
}
.content-layout {
    display: grid;
    gap: 24px;
    align-items: start;
}
.article-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 26px;
    box-shadow: var(--shadow);
}
.sidebar-card {
    background: #F7FAFF;
    border: 1px solid var(--border);
    border-radius: 26px;
    padding: 22px;
}
.sidebar-card a {
    display: block;
    padding: 10px 0;
    color: var(--blue);
    font-weight: 800;
}
.checklist {
    display: grid;
    gap: 12px;
    margin: 22px 0;
}
.check-item {
    padding: 16px;
    border-radius: 18px;
    border: 1px solid var(--border);
    background: #fff;
}
.note-box {
    border-radius: 22px;
    background: #EEF4FF;
    border: 1px solid #DCE8FF;
    padding: 18px;
    color: #3B4658;
    margin: 20px 0;
}
.download-panel {
    background: #F7FAFF;
    border: 1px solid var(--border);
    border-radius: 32px;
    padding: 28px;
    text-align: center;
    box-shadow: var(--shadow);
}
.download-steps {
    counter-reset: item;
    display: grid;
    gap: 14px;
    margin: 28px 0;
}
.download-steps li {
    list-style: none;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 16px 18px;
    color: #465267;
}
.site-footer {
    background: #172033;
    color: #C9D2E2;
    padding: 54px 0 26px;
}
.site-footer p,
.site-footer a,
.site-footer span {
    color: #C9D2E2;
}
.footer-grid {
    display: grid;
    gap: 24px;
}
.footer-logo {
    color: #fff;
    font-weight: 900;
    font-size: 22px;
    margin-bottom: 14px;
}
.site-footer h3 {
    color: #fff;
    font-size: 16px;
}
.site-footer a {
    display: block;
    margin: 8px 0;
}
.footer-bottom {
    margin-top: 32px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.12);
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 13px;
}
@media (min-width: 680px) {
    .highlight-grid,
    .privacy-grid,
    .risk-grid,
    .faq-grid,
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    .speed-metrics {
        grid-template-columns: repeat(3, 1fr);
    }
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}
@media (min-width: 920px) {
    .nav-toggle {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .hero-grid,
    .feature-split,
    .vpn-connection-section,
    .global-nodes-section,
    .multi-device-section,
    .content-layout {
        grid-template-columns: 1.05fr .95fr;
    }
    .highlight-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .no-log-policy-section,
    .encryption-protocol-section,
    .risk-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(3, 1fr);
    }
    .section {
        padding: 94px 0;
    }
    .vpn-saas-hero {
        padding: 72px 0 96px;
    }
    .feature-panel,
    .privacy-protection-section,
    .safety-panel {
        padding: 38px;
    }
    .high-speed-section {
        grid-template-columns: .9fr 1.1fr;
        padding: 38px;
    }
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}
@media (max-width: 420px) {
    .container {
        width: min(100% - 28px, 1120px);
    }
    .download-btn {
        width: 100%;
    }
    .hero-actions .download-btn {
        width: auto;
    }
    .float-card {
        position: static;
        display: inline-flex;
        margin: 6px;
    }
    .hero-visual {
        min-height: auto;
    }
    .product-card {
        margin-bottom: 12px;
    }
}