* {
    box-sizing: border-box;
}
:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #182033;
    --muted: #667085;
    --light: #F5F7FB;
    --soft-blue: #F2F6FF;
    --line: #E4EAF3;
    --white: #FFFFFF;
    --radius-lg: 32px;
    --radius-md: 24px;
    --shadow: 0 20px 60px rgba(24, 32, 51, 0.08);
}
html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    background: #FFFFFF;
    color: var(--text);
    line-height: 1.75;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    display: block;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(228,234,243,0.9);
}
.nav-shell {
    width: min(1180px, calc(100% - 32px));
    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: 0.04em;
}
.logo-img {
    width: 38px;
    height: 38px;
    object-fit: cover;
    border-radius: 12px;
}
.brand-text {
    font-size: 20px;
}
.main-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    padding: 16px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.main-nav a {
    display: block;
    padding: 12px 10px;
    color: #475467;
    font-size: 15px;
    border-radius: 12px;
}
.main-nav a:hover,
.main-nav a.active {
    color: var(--blue);
    background: #F0F6FF;
}
.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}
.nav-toggle-label {
    display: inline-flex;
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
}
.nav-toggle-label span {
    width: 20px;
    height: 2px;
    background: #263246;
    border-radius: 999px;
}
.nav-toggle:checked ~ .main-nav {
    display: block;
}
.container {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}
.section {
    padding: 64px 0;
}
.section-soft {
    background: var(--light);
}
.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--blue);
    background: #EFF6FF;
    border: 1px solid #D9E8FF;
    border-radius: 999px;
    padding: 7px 13px;
    font-size: 13px;
    font-weight: 700;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #FFFFFF;
    font-weight: 800;
    box-shadow: 0 14px 26px rgba(41, 128, 254, 0.24);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 18px 32px rgba(23, 104, 232, 0.28);
}
.link-more {
    color: var(--blue);
    font-weight: 700;
    display: inline-flex;
    margin-top: 10px;
}
.gradient-bg {
    background: var(--gradient);
    color: #fff;
}
.vpn-saas-hero {
    padding: 40px 0 76px;
    background: var(--gradient);
    color: #fff;
    position: relative;
    overflow: hidden;
    isolation: isolate;
}
.vpn-saas-hero::after {
    content: "";
    position: absolute;
    left: -10%;
    right: -10%;
    bottom: -90px;
    height: 160px;
    background: #fff;
    transform: skewY(-5deg);
    z-index: -1;
}
.hero-grid {
    display: grid;
    gap: 36px;
    align-items: center;
}
.hero-copy h1 {
    margin: 16px 0;
    font-size: clamp(34px, 9vw, 64px);
    line-height: 1.08;
    letter-spacing: -0.04em;
}
.hero-copy p {
    color: rgba(255,255,255,0.86);
    font-size: 17px;
    margin: 0 0 24px;
}
.hero-tags,
.floating-tags,
.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.hero-tags span,
.floating-tags span,
.tag-row span {
    background: rgba(255,255,255,0.14);
    border: 1px solid rgba(255,255,255,0.24);
    border-radius: 999px;
    padding: 8px 12px;
    color: rgba(255,255,255,0.9);
    font-size: 13px;
}
.hero-card {
    position: relative;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.22);
    border-radius: 36px;
    padding: 22px;
    box-shadow: 0 24px 80px rgba(20,31,82,.26);
}
.hero-card img {
    border-radius: 26px;
    margin: 0 auto;
}
.floating-tags {
    margin-top: 16px;
    justify-content: center;
}
.product-highlights {
    margin-top: -34px;
    position: relative;
    z-index: 2;
}
.highlights-grid,
.card-grid,
.risk-grid,
.faq-grid,
.info-grid,
.page-card-grid,
.footer-grid {
    display: grid;
    gap: 18px;
}
.highlight-card,
.feature-card,
.risk-card,
.faq-item,
.info-card,
.page-card,
.step-card,
.note-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 12px 38px rgba(24,32,51,0.05);
}
.highlight-card strong,
.feature-card h3,
.risk-card h3,
.faq-item h3,
.info-card h3,
.page-card h3,
.step-card h3 {
    display: block;
    margin: 0 0 8px;
    color: #182033;
    font-size: 18px;
}
.highlight-card span {
    display: inline-flex;
    margin-bottom: 12px;
    color: var(--blue);
    font-size: 13px;
    font-weight: 800;
}
.highlight-card p,
.feature-card p,
.risk-card p,
.faq-item p,
.info-card p,
.page-card p,
.step-card p,
.note-panel p {
    color: var(--muted);
    margin: 0;
}
.section-title {
    margin: 0 auto 28px;
    max-width: 760px;
    text-align: center;
}
.section-title h2 {
    margin: 12px 0 10px;
    font-size: clamp(28px, 6vw, 44px);
    line-height: 1.2;
    letter-spacing: -0.03em;
}
.section-title p {
    color: var(--muted);
    margin: 0;
}
.split-panel {
    display: grid;
    gap: 28px;
    align-items: center;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}
.split-panel.soft {
    background: linear-gradient(180deg, #fff 0%, #F7FAFF 100%);
}
.split-copy h2 {
    margin: 10px 0;
    font-size: clamp(26px, 6vw, 42px);
    line-height: 1.18;
}
.split-copy p {
    color: var(--muted);
}
.check-list,
.clean-list {
    list-style: none;
    padding: 0;
    margin: 18px 0;
    display: grid;
    gap: 10px;
}
.check-list li,
.clean-list li {
    position: relative;
    padding-left: 26px;
    color: #344054;
}
.check-list li::before,
.clean-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 #EAF3FF;
}
.image-card {
    border-radius: 28px;
    background: var(--soft-blue);
    padding: 18px;
    border: 1px solid #DDE9FF;
}
.image-card img {
    border-radius: 22px;
    margin: auto;
}
.high-speed-section {
    background: linear-gradient(180deg, #F6F9FF 0%, #FFFFFF 100%);
}
.speed-card {
    display: grid;
    gap: 18px;
}
.speed-metrics {
    display: grid;
    gap: 14px;
}
.metric {
    padding: 18px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
}
.metric b {
    display: block;
    color: var(--blue);
    margin-bottom: 6px;
}
.privacy-protection-section .privacy-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}
.policy-strip {
    display: grid;
    gap: 18px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 22px;
}
.device-showcase {
    background: var(--gradient);
    color: #fff;
    border-radius: var(--radius-lg);
    padding: 24px;
    overflow: hidden;
}
.device-showcase p {
    color: rgba(255,255,255,0.84);
}
.protocol-panel {
    background: #10182A;
    color: #fff;
    border-radius: var(--radius-lg);
    padding: 26px;
    display: grid;
    gap: 18px;
}
.protocol-panel p,
.protocol-panel li {
    color: rgba(255,255,255,0.78);
}
.protocol-panel .info-card {
    background: rgba(255,255,255,0.08);
    border-color: rgba(255,255,255,0.14);
}
.protocol-panel .info-card h3 {
    color: #fff;
}
.process-steps {
    display: grid;
    gap: 16px;
    counter-reset: steps;
}
.step-card {
    position: relative;
    padding-top: 54px;
}
.step-card::before {
    counter-increment: steps;
    content: counter(steps, decimal-leading-zero);
    position: absolute;
    top: 18px;
    left: 22px;
    color: var(--blue);
    font-weight: 900;
    font-size: 20px;
}
.risk-card {
    border-left: 4px solid var(--blue);
}
.cta-section {
    padding: 72px 0;
}
.cta-box {
    text-align: center;
    background: var(--gradient);
    color: #fff;
    border-radius: 36px;
    padding: 42px 22px;
    position: relative;
    overflow: hidden;
}
.cta-box::before {
    content: "";
    position: absolute;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: rgba(255,255,255,0.12);
    right: -90px;
    top: -120px;
}
.cta-box h2 {
    margin: 0 0 10px;
    font-size: clamp(28px, 7vw, 42px);
}
.cta-box p {
    max-width: 680px;
    margin: 0 auto 22px;
    color: rgba(255,255,255,0.86);
}
.page-hero {
    background: linear-gradient(180deg, #F5F8FF 0%, #FFFFFF 100%);
    padding: 56px 0 32px;
}
.page-hero-inner {
    max-width: 860px;
}
.page-hero h1 {
    margin: 14px 0 12px;
    font-size: clamp(32px, 7vw, 56px);
    line-height: 1.15;
    letter-spacing: -0.04em;
}
.page-hero p {
    color: var(--muted);
    font-size: 17px;
}
.page-layout {
    display: grid;
    gap: 24px;
    align-items: start;
}
.article-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}
.article-panel h2 {
    margin-top: 0;
    font-size: 26px;
}
.article-panel p {
    color: #4B5565;
}
.sidebar-panel {
    background: #F7FAFF;
    border: 1px solid #DDE9FF;
    border-radius: var(--radius-md);
    padding: 22px;
}
.sidebar-panel h3 {
    margin-top: 0;
}
.sidebar-panel a {
    display: block;
    color: var(--blue);
    font-weight: 700;
    padding: 8px 0;
}
.download-steps {
    display: grid;
    gap: 14px;
    margin: 24px 0;
}
.download-step {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 12px;
    align-items: start;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 16px;
}
.download-step b {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: #EAF3FF;
    color: var(--blue);
}
.faq-list {
    display: grid;
    gap: 16px;
}
.faq-list .faq-item {
    box-shadow: none;
}
.site-footer {
    background: #101828;
    color: #D0D5DD;
    padding-top: 48px;
}
.footer-grid {
    grid-template-columns: 1fr;
}
.footer-brand {
    color: #fff;
    font-size: 24px;
    font-weight: 900;
    margin-bottom: 10px;
}
.site-footer h3 {
    color: #fff;
    margin: 0 0 10px;
}
.site-footer a {
    display: block;
    color: #D0D5DD;
    padding: 5px 0;
}
.site-footer a:hover {
    color: #fff;
}
.footer-bottom {
    margin-top: 34px;
    padding: 20px 16px;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #98A2B3;
}
@media (min-width: 700px) {
    .highlights-grid,
    .card-grid,
    .risk-grid,
    .faq-grid,
    .page-card-grid,
    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .info-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .speed-card {
        grid-template-columns: 1.2fr .8fr;
        align-items: center;
    }
    .footer-grid {
        grid-template-columns: 1.4fr repeat(3, 1fr);
    }
}
@media (min-width: 980px) {
    .nav-toggle-label {
        display: none;
    }
    .main-nav {
        display: flex;
        position: static;
        padding: 0;
        background: transparent;
        border: 0;
        box-shadow: none;
        gap: 4px;
        align-items: center;
        justify-content: flex-end;
    }
    .main-nav a {
        display: inline-flex;
        padding: 9px 12px;
    }
    .hero-grid,
    .split-panel,
    .page-layout,
    .policy-strip {
        grid-template-columns: 1.05fr .95fr;
    }
    .highlights-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .section {
        padding: 86px 0;
    }
    .article-panel,
    .privacy-protection-section .privacy-panel {
        padding: 34px;
    }
    .page-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
    }
}
@media (max-width: 420px) {
    .container,
    .nav-shell {
        width: min(100% - 24px, 1180px);
    }
    .download-btn {
        width: 100%;
    }
    .hero-tags span,
    .floating-tags span,
    .tag-row span {
        font-size: 12px;
    }
    .highlight-card,
    .feature-card,
    .risk-card,
    .faq-item,
    .info-card,
    .page-card,
    .step-card,
    .article-panel,
    .split-panel {
        padding: 18px;
    }
}