* {
    box-sizing: border-box;
}
:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --line: #e5eaf3;
    --panel: #ffffff;
    --deep: #111827;
    --radius: 28px;
    --shadow: 0 18px 50px rgba(22, 35, 80, 0.10);
}
html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", 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 {
    color: var(--muted);
    margin: 0 0 16px;
}
h1, h2, h3 {
    color: var(--deep);
    line-height: 1.22;
    margin: 0 0 16px;
}
h1 {
    font-size: clamp(34px, 7vw, 64px);
    letter-spacing: -1.5px;
}
h2 {
    font-size: clamp(26px, 4.2vw, 42px);
    letter-spacing: -0.8px;
}
h3 {
    font-size: 21px;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(229, 234, 243, 0.9);
}
.header-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #111827;
}
.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}
.brand-text {
    font-size: 20px;
}
.site-nav {
    display: none;
    gap: 4px;
    align-items: center;
}
.site-nav a {
    color: #455066;
    font-size: 15px;
    padding: 10px 12px;
    border-radius: 999px;
    transition: 0.2s ease;
}
.site-nav a:hover,
.site-nav a.active {
    color: var(--blue);
    background: #edf5ff;
}
.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: 0;
    cursor: pointer;
}
.nav-toggle-label span {
    width: 20px;
    height: 2px;
    background: #25324b;
    display: block;
    margin: 3px 0;
    border-radius: 4px;
}
.nav-toggle:checked ~ .site-nav {
    display: grid;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 70px;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
    padding: 12px;
}
.nav-toggle:checked ~ .site-nav a {
    border-radius: 14px;
}
.container,
.section-inner,
.content-container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 18px;
}
.section {
    padding: 72px 0;
}
.section-soft {
    background: linear-gradient(180deg, #f7f9ff 0%, #ffffff 100%);
}
.section-head {
    max-width: 760px;
    margin: 0 auto 34px;
    text-align: center;
}
.section-eyebrow,
.category-badge,
.card-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    color: var(--blue);
    background: #edf5ff;
    border: 1px solid #d7e8ff;
    border-radius: 999px;
    padding: 6px 12px;
    font-weight: 700;
    font-size: 13px;
    margin-bottom: 14px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #ffffff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(41, 128, 254, 0.28);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}
.download-btn:hover {
    background: var(--blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(23, 104, 232, 0.30);
}
.text-link {
    color: var(--blue);
    font-weight: 700;
}
.pill-list,
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.pill-list span,
.tag-row span {
    display: inline-flex;
    align-items: center;
    padding: 7px 12px;
    color: #ffffff;
    background: rgba(255, 255, 255, 0.17);
    border: 1px solid rgba(255, 255, 255, 0.24);
    border-radius: 999px;
    font-size: 13px;
}
.vpn-saas-hero {
    position: relative;
    padding: 46px 0 70px;
    overflow: hidden;
    background: #f6f8ff;
}
.vpn-saas-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    min-height: 72%;
    background: var(--gradient);
    clip-path: polygon(0 0, 100% 0, 100% 78%, 0 96%);
}
.hero-inner {
    position: relative;
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 18px;
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-copy {
    color: #ffffff;
}
.hero-copy h1,
.hero-copy p {
    color: #ffffff;
}
.hero-copy p {
    max-width: 650px;
    opacity: 0.92;
    font-size: 17px;
}
.hero-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    margin: 24px 0 22px;
}
.hero-note {
    color: rgba(255, 255, 255, 0.85);
    font-size: 14px;
}
.hero-product {
    position: relative;
    min-height: 340px;
}
.product-shell {
    position: relative;
    border-radius: 36px;
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.24);
    padding: 24px;
    box-shadow: 0 30px 80px rgba(34, 18, 105, 0.26);
    backdrop-filter: blur(8px);
}
.product-shell img {
    width: 100%;
    border-radius: 28px;
    background: #ffffff;
    box-shadow: 0 24px 60px rgba(18, 23, 54, 0.18);
}
.float-card {
    position: absolute;
    background: #ffffff;
    border: 1px solid var(--line);
    color: #111827;
    border-radius: 18px;
    padding: 10px 14px;
    box-shadow: var(--shadow);
    font-weight: 800;
    font-size: 13px;
}
.float-card small {
    display: block;
    color: var(--muted);
    font-weight: 600;
}
.float-card.one {
    left: 4px;
    top: 22px;
}
.float-card.two {
    right: 0;
    top: 44%;
}
.float-card.three {
    left: 18px;
    bottom: 16px;
}
.float-card.four {
    right: 24px;
    bottom: -14px;
}
.product-highlights {
    margin-top: -30px;
    position: relative;
    z-index: 3;
}
.highlight-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.highlight-card {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 26px;
    padding: 24px;
    box-shadow: 0 14px 36px rgba(30, 43, 84, 0.08);
}
.highlight-card .card-badge {
    margin-bottom: 12px;
}
.feature-split,
.vpn-connection-section,
.high-speed-section,
.global-nodes-section,
.multi-device-section {
    display: grid;
    gap: 28px;
    align-items: center;
}
.feature-panel,
.visual-panel,
.privacy-panel,
.protocol-panel,
.safety-panel {
    border-radius: var(--radius);
    background: #ffffff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 26px;
}
.visual-panel {
    background: linear-gradient(180deg, #ffffff 0%, #f4f8ff 100%);
}
.visual-panel img {
    border-radius: 24px;
}
.check-list {
    display: grid;
    gap: 12px;
    margin: 22px 0;
    padding: 0;
    list-style: none;
}
.check-list li {
    position: relative;
    padding-left: 30px;
    color: #3f4b61;
}
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 9px;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 5px #e9f3ff;
}
.high-speed-section {
    border-radius: 34px;
    background: linear-gradient(135deg, #f4f7ff 0%, #ffffff 70%);
    border: 1px solid var(--line);
    padding: 26px;
}
.speed-metrics {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 18px;
}
.metric-card {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 18px;
}
.metric-card strong {
    display: block;
    font-size: 22px;
    color: var(--blue);
}
.nodes-list {
    display: grid;
    gap: 12px;
}
.node-item {
    padding: 16px;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: #ffffff;
}
.privacy-protection-section {
    border-radius: 34px;
    background: #ffffff;
    border: 1px solid var(--line);
    padding: 26px;
    box-shadow: var(--shadow);
}
.privacy-grid,
.no-log-policy-section,
.protocol-grid,
.risk-grid,
.faq-grid,
.related-grid,
.info-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.privacy-card,
.policy-card,
.protocol-card,
.risk-card,
.faq-item,
.related-card,
.info-card {
    border: 1px solid var(--line);
    border-radius: 24px;
    background: #ffffff;
    padding: 22px;
}
.privacy-card {
    background: #f8fbff;
}
.policy-card,
.protocol-card {
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}
.policy-card h3,
.protocol-card h3,
.risk-card h3 {
    display: flex;
    align-items: center;
    gap: 10px;
}
.policy-card h3::before,
.protocol-card h3::before,
.risk-card h3::before {
    content: "";
    width: 9px;
    height: 24px;
    border-radius: 9px;
    background: var(--blue);
}
.device-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}
.device-card {
    border-radius: 24px;
    padding: 22px;
    background: #ffffff;
    border: 1px solid var(--line);
}
.encryption-protocol-section {
    border-radius: 34px;
    background: linear-gradient(135deg, #f6f8ff 0%, #ffffff 60%);
    border: 1px solid var(--line);
    padding: 26px;
}
.protocol-panel {
    background:
        radial-gradient(circle at top right, rgba(41, 128, 254, 0.12), transparent 42%),
        #ffffff;
}
.process-steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    counter-reset: step;
}
.step-card {
    position: relative;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    box-shadow: 0 12px 30px rgba(30, 43, 84, 0.06);
}
.step-number {
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    background: var(--blue);
    color: #ffffff;
    border-radius: 50%;
    font-weight: 900;
    margin-bottom: 14px;
}
.risk-card {
    border-left: 4px solid var(--blue);
}
.faq-item summary {
    cursor: pointer;
    font-weight: 800;
    color: #111827;
}
.faq-item p {
    margin-top: 12px;
}
.cta-section {
    margin: 72px auto 0;
    max-width: 1180px;
    border-radius: 36px;
    background: var(--gradient);
    color: #ffffff;
    padding: 44px 22px;
    text-align: center;
    overflow: hidden;
    position: relative;
}
.cta-section::after {
    content: "";
    position: absolute;
    width: 260px;
    height: 260px;
    right: -90px;
    bottom: -90px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.14);
}
.cta-section h2,
.cta-section p {
    color: #ffffff;
    position: relative;
    z-index: 1;
}
.cta-section .download-btn {
    position: relative;
    z-index: 1;
}
.page-hero {
    background: linear-gradient(180deg, #f5f7ff 0%, #ffffff 100%);
    padding: 54px 0 34px;
}
.page-hero-card {
    border-radius: 34px;
    background: #ffffff;
    border: 1px solid var(--line);
    padding: 28px;
    box-shadow: var(--shadow);
}
.page-hero p {
    max-width: 840px;
    font-size: 17px;
}
.page-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}
.article-card {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 26px;
    box-shadow: 0 14px 38px rgba(30, 43, 84, 0.06);
}
.article-card + .article-card {
    margin-top: 18px;
}
.side-panel {
    background: #f7faff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    height: fit-content;
}
.notice-box {
    border-radius: 24px;
    background: #f6f9ff;
    border: 1px solid #dceaff;
    padding: 20px;
    margin: 20px 0;
}
.action-row {
    margin-top: 24px;
}
.steps-list {
    margin: 0;
    padding-left: 20px;
    color: #455066;
}
.steps-list li {
    margin-bottom: 10px;
}
.download-page-grid {
    display: grid;
    gap: 24px;
    align-items: center;
}
.download-card {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 34px;
    padding: 28px;
    box-shadow: var(--shadow);
}
.safe-tips {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}
.safe-tip {
    padding: 18px;
    border-radius: 22px;
    border: 1px solid var(--line);
    background: #ffffff;
}
.about-story {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}
.site-footer {
    margin-top: 80px;
    background: #f7f8fb;
    border-top: 1px solid var(--line);
}
.footer-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 34px 18px;
    display: grid;
    gap: 22px;
}
.footer-brand {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}
.footer-brand img {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    object-fit: cover;
}
.footer-brand p {
    margin: 4px 0 0;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}
.footer-links a {
    color: #455066;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 8px 12px;
}
.footer-bottom {
    border-top: 1px solid var(--line);
    padding: 16px 18px 26px;
    text-align: center;
    color: var(--muted);
    font-size: 14px;
}
@media (min-width: 640px) {
    .highlight-grid,
    .privacy-grid,
    .no-log-policy-section,
    .protocol-grid,
    .risk-grid,
    .related-grid,
    .info-grid,
    .safe-tips {
        grid-template-columns: repeat(2, 1fr);
    }
    .speed-metrics,
    .device-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 900px) {
    .site-nav {
        display: flex;
    }
    .nav-toggle-label {
        display: none;
    }
    .hero-inner {
        grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.98fr);
    }
    .vpn-saas-hero {
        padding: 76px 0 92px;
    }
    .highlight-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .feature-split,
    .vpn-connection-section,
    .global-nodes-section,
    .multi-device-section,
    .download-page-grid,
    .about-story {
        grid-template-columns: 1fr 1fr;
    }
    .high-speed-section,
    .encryption-protocol-section {
        grid-template-columns: 1.05fr 0.95fr;
    }
    .privacy-grid,
    .no-log-policy-section,
    .protocol-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .risk-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .faq-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .page-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
    }
    .footer-inner {
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }
    .footer-links {
        justify-content: flex-end;
    }
    .section {
        padding: 96px 0;
    }
    .product-shell {
        transform: rotate(1.2deg);
    }
}
@media (min-width: 1100px) {
    .process-steps {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (max-width: 420px) {
    .hero-actions {
        align-items: stretch;
    }
    .download-btn {
        width: 100%;
    }
    .float-card {
        position: static;
        margin-top: 10px;
    }
    .product-shell {
        padding: 14px;
    }
}