* {
    box-sizing: border-box;
}

:root {
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #172033;
    --muted: #667085;
    --light: #F6F8FC;
    --line: #E6EAF2;
    --panel: #FFFFFF;
    --soft-blue: #EEF5FF;
    --radius: 28px;
    --shadow: 0 18px 50px rgba(28, 43, 86, .10);
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #fff;
    line-height: 1.75;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    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, .92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(230, 234, 242, .86);
}

.header-inner {
    min-height: 72px;
    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;
    font-size: 22px;
    color: var(--text);
}

.brand img,
.footer-brand img {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 13px;
    box-shadow: 0 8px 20px rgba(41, 128, 254, .18);
}

.site-nav {
    display: none;
    align-items: center;
    gap: 2px;
}

.site-nav a {
    color: #3E4758;
    font-size: 14px;
    padding: 10px 12px;
    border-radius: 999px;
    transition: .2s ease;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--blue);
    background: var(--soft-blue);
}

.nav-toggle {
    display: none;
}

.nav-toggle-label {
    width: 44px;
    height: 44px;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 0 11px;
    cursor: pointer;
}

.nav-toggle-label span {
    display: block;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
}

.nav-toggle:checked ~ .site-nav {
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
}

.vpn-saas-hero {
    position: relative;
    overflow: hidden;
    padding: 48px 0 64px;
    background: radial-gradient(circle at 15% 10%, rgba(255,255,255,.35), transparent 28%), var(--brand-gradient);
    color: #fff;
}

.vpn-saas-hero::after {
    content: "";
    position: absolute;
    right: -12%;
    bottom: -120px;
    width: 55%;
    height: 260px;
    background: rgba(255,255,255,.18);
    transform: skewY(-8deg);
    border-radius: 60px;
}

.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
}

.eyebrow,
.category-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, .10);
    color: var(--blue);
    font-size: 13px;
    font-weight: 700;
}

.vpn-saas-hero .eyebrow {
    background: rgba(255,255,255,.18);
    color: #fff;
    border: 1px solid rgba(255,255,255,.24);
}

h1,
h2,
h3 {
    line-height: 1.22;
    margin: 0;
}

h1 {
    font-size: clamp(34px, 8vw, 62px);
    letter-spacing: -1.6px;
}

h2 {
    font-size: clamp(28px, 5vw, 42px);
    letter-spacing: -.8px;
}

h3 {
    font-size: 21px;
}

.hero-copy p,
.section-lead,
.page-summary,
.cta-section p {
    color: var(--muted);
    font-size: 16px;
}

.hero-copy p {
    color: rgba(255,255,255,.88);
    margin: 18px 0 24px;
    max-width: 620px;
}

.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;
    box-shadow: 0 14px 30px rgba(41, 128, 254, .28);
    transition: .2s ease;
}

.download-btn:hover {
    background: var(--blue-dark);
    transform: translateY(-1px);
}

.hero-tags,
.mini-tags,
.info-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.hero-tags span,
.info-tags span,
.mini-tags span {
    display: inline-flex;
    padding: 7px 11px;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
    color: #fff;
    font-size: 13px;
}

.info-tags span,
.mini-tags span {
    background: var(--soft-blue);
    border-color: rgba(41,128,254,.12);
    color: var(--blue);
}

.hero-visual {
    position: relative;
    min-height: 340px;
}

.product-card {
    position: relative;
    padding: 24px;
    border-radius: 36px;
    background: rgba(255,255,255,.18);
    border: 1px solid rgba(255,255,255,.28);
    box-shadow: 0 24px 80px rgba(28, 43, 86, .22);
}

.product-card img {
    margin: 0 auto;
    border-radius: 28px;
    max-height: 390px;
    object-fit: contain;
}

.float-tag {
    position: absolute;
    background: #fff;
    color: var(--text);
    border-radius: 18px;
    padding: 10px 13px;
    font-size: 13px;
    font-weight: 800;
    box-shadow: 0 15px 35px rgba(18, 28, 54, .16);
}

.float-tag.one { top: 18px; left: 10px; }
.float-tag.two { top: 68px; right: 2px; }
.float-tag.three { bottom: 70px; left: 0; }
.float-tag.four { bottom: 24px; right: 22px; }

section {
    padding: 68px 0;
}

.section-heading {
    display: grid;
    gap: 12px;
    margin-bottom: 28px;
    max-width: 760px;
}

.product-highlights,
.high-speed-section,
.no-log-policy-section,
.process-section,
.faq-preview,
.page-soft-bg {
    background: var(--light);
}

.highlight-grid {
    display: grid;
    gap: 16px;
}

.highlight-card,
.feature-card,
.risk-card,
.faq-item,
.step-card,
.page-card,
.tip-box,
.check-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 12px 35px rgba(28, 43, 86, .05);
}

.highlight-card .tag {
    display: inline-flex;
    padding: 5px 10px;
    border-radius: 999px;
    color: var(--blue);
    background: var(--soft-blue);
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 12px;
}

.highlight-card p,
.feature-card p,
.risk-card p,
.step-card p,
.page-card p,
.tip-box p,
.check-card p,
.faq-item p {
    color: var(--muted);
    margin-bottom: 0;
}

.text-link {
    display: inline-flex;
    margin-top: 14px;
    color: var(--blue);
    font-weight: 800;
}

.split-section,
.feature-panel,
.privacy-panel,
.devices-panel,
.protocol-panel,
.download-panel,
.page-layout {
    display: grid;
    gap: 28px;
    align-items: center;
}

.feature-panel,
.privacy-panel,
.devices-panel,
.protocol-panel,
.download-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 36px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.feature-panel.alt {
    background: linear-gradient(180deg, #FFFFFF 0%, #F6F9FF 100%);
}

.feature-image img,
.panel-image img,
.page-image img {
    border-radius: 30px;
    background: var(--soft-blue);
    border: 1px solid rgba(41,128,254,.10);
}

.bullet-list,
.clean-list {
    padding: 0;
    margin: 18px 0 0;
    list-style: none;
    display: grid;
    gap: 10px;
}

.bullet-list li,
.clean-list li {
    position: relative;
    padding-left: 28px;
    color: #3E4758;
}

.bullet-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .72em;
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: var(--blue);
    box-shadow: 0 0 0 5px rgba(41,128,254,.10);
}

.nodes-layout,
.privacy-grid,
.no-log-grid,
.devices-grid,
.protocol-grid,
.risk-grid,
.faq-grid,
.related-grid,
.cards-grid {
    display: grid;
    gap: 16px;
}

.nodes-card {
    padding: 22px;
    border-radius: 28px;
    background: #fff;
    border: 1px solid var(--line);
}

.nodes-card strong {
    color: var(--blue);
}

.privacy-protection-section {
    background: linear-gradient(180deg, #FFFFFF 0%, #F5F8FF 100%);
}

.privacy-card,
.protocol-card,
.device-card {
    background: rgba(255,255,255,.9);
    border: 1px solid var(--line);
    border-radius: 26px;
    padding: 22px;
}

.no-log-card {
    background: #fff;
    border: 1px solid var(--line);
    border-top: 4px solid var(--blue);
    border-radius: 26px;
    padding: 22px;
}

.process-steps {
    display: grid;
    gap: 16px;
    counter-reset: steps;
}

.step-card {
    position: relative;
    padding-top: 52px;
}

.step-card::before {
    counter-increment: steps;
    content: counter(steps, decimal-leading-zero);
    position: absolute;
    top: 20px;
    left: 24px;
    color: var(--blue);
    font-weight: 900;
    letter-spacing: .08em;
}

.safety-panel {
    padding: 28px;
    border-radius: 36px;
    background: linear-gradient(135deg, #F8FBFF 0%, #FFFFFF 100%);
    border: 1px solid var(--line);
}

.risk-card {
    border-left: 4px solid var(--blue);
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.cta-section {
    padding: 70px 0;
}

.cta-box {
    text-align: center;
    padding: 42px 22px;
    border-radius: 36px;
    color: #fff;
    background: radial-gradient(circle at 20% 20%, rgba(255,255,255,.26), transparent 24%), var(--brand-gradient);
    box-shadow: var(--shadow);
}

.cta-box p {
    color: rgba(255,255,255,.86);
    max-width: 680px;
    margin: 14px auto 22px;
}

.page-hero {
    padding: 54px 0 34px;
    background: linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 100%);
}

.page-hero-inner {
    display: grid;
    gap: 14px;
    max-width: 850px;
}

.page-summary {
    margin: 0;
    max-width: 780px;
}

.page-content {
    padding: 38px 0 70px;
}

.page-layout {
    align-items: start;
}

.article-body {
    display: grid;
    gap: 18px;
}

.article-body p {
    color: #3E4758;
    margin: 0;
}

.article-body h2 {
    font-size: 26px;
    margin-top: 12px;
}

.aside-panel {
    display: grid;
    gap: 16px;
}

.notice-box {
    padding: 20px;
    border-radius: 24px;
    background: var(--soft-blue);
    color: #2D4B78;
    border: 1px solid rgba(41,128,254,.14);
}

.page-download {
    margin-top: 22px;
}

.steps-list {
    display: grid;
    gap: 12px;
    list-style: none;
    padding: 0;
    margin: 0;
    counter-reset: pageSteps;
}

.steps-list li {
    counter-increment: pageSteps;
    padding: 16px 16px 16px 54px;
    position: relative;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
}

.steps-list li::before {
    content: counter(pageSteps);
    position: absolute;
    left: 16px;
    top: 15px;
    width: 26px;
    height: 26px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
}

.download-page .download-panel {
    align-items: start;
}

.site-footer {
    background: #121A2C;
    color: rgba(255,255,255,.78);
    padding: 52px 0 26px;
}

.footer-grid {
    display: grid;
    gap: 28px;
}

.footer-brand {
    color: #fff;
    margin-bottom: 12px;
}

.site-footer h3 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 12px;
}

.site-footer a {
    display: block;
    color: rgba(255,255,255,.72);
    margin: 7px 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;
    font-size: 13px;
}

@media (min-width: 680px) {
    .highlight-grid,
    .privacy-grid,
    .no-log-grid,
    .devices-grid,
    .protocol-grid,
    .risk-grid,
    .faq-grid,
    .related-grid,
    .cards-grid,
    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1.4fr 1fr 1fr 1fr;
    }

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

@media (min-width: 980px) {
    .nav-toggle-label {
        display: none;
    }

    .site-nav {
        display: flex;
    }

    .hero-grid,
    .split-section,
    .feature-panel,
    .privacy-panel,
    .devices-panel,
    .protocol-panel,
    .download-panel,
    .page-layout {
        grid-template-columns: 1.04fr .96fr;
    }

    .highlight-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .no-log-grid,
    .risk-grid,
    .protocol-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .page-layout {
        grid-template-columns: minmax(0, 1fr) 340px;
    }

    .vpn-saas-hero {
        padding: 72px 0 88px;
    }

    .feature-panel,
    .privacy-panel,
    .devices-panel,
    .protocol-panel,
    .download-panel {
        padding: 38px;
    }
}

@media (max-width: 420px) {
    .container {
        width: min(100% - 24px, 1120px);
    }

    .nav-toggle:checked ~ .site-nav {
        grid-template-columns: 1fr;
        left: 12px;
        right: 12px;
    }

    .float-tag {
        position: static;
        display: inline-flex;
        margin: 6px 6px 0 0;
    }

    .hero-visual {
        min-height: auto;
    }

    section {
        padding: 52px 0;
    }
}