* {
    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: #F5F7FB;
    --line: #E6EAF2;
    --soft-blue: #EEF5FF;
    --white: #FFFFFF;
    --radius-lg: 32px;
    --radius-md: 24px;
    --shadow: 0 22px 55px rgba(35, 66, 126, 0.12);
    --shadow-soft: 0 14px 35px rgba(42, 64, 126, 0.08);
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #FAFBFF;
    line-height: 1.72;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

p {
    margin: 0 0 16px;
}

ul,
ol {
    padding-left: 20px;
    margin: 0;
}

li {
    margin: 8px 0;
}

.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(230, 234, 242, 0.9);
}

.nav-shell {
    max-width: 1180px;
    margin: 0 auto;
    min-height: 70px;
    padding: 0 18px;
    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;
    letter-spacing: -0.02em;
}

.brand img,
.footer-brand img {
    width: 38px;
    height: 38px;
    object-fit: cover;
    border-radius: 12px;
}

.site-nav {
    display: none;
    width: 100%;
    position: absolute;
    top: 70px;
    left: 0;
    padding: 12px 18px 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
}

.site-nav a {
    display: block;
    padding: 12px 14px;
    border-radius: 14px;
    color: #344054;
    font-size: 15px;
}

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

.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.nav-toggle-label {
    width: 42px;
    height: 42px;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    align-items: center;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
}

.nav-toggle-label span {
    width: 18px;
    height: 2px;
    background: #1D2939;
    border-radius: 999px;
}

.nav-toggle:checked ~ .site-nav {
    display: block;
}

.container {
    width: min(100% - 36px, 1180px);
    margin: 0 auto;
}

.narrow-container {
    width: min(100% - 36px, 880px);
    margin: 0 auto;
}

.page-section {
    padding: 68px 0;
}

.section-kicker,
.category-badge,
.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--blue);
    font-size: 13px;
    font-weight: 700;
}

.section-title {
    font-size: clamp(28px, 5vw, 46px);
    line-height: 1.18;
    margin: 14px 0 16px;
    letter-spacing: -0.04em;
}

.section-desc {
    max-width: 720px;
    color: var(--muted);
    font-size: 16px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 26px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(41, 128, 254, 0.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(23, 104, 232, 0.32);
}

.text-link {
    color: var(--blue);
    font-weight: 800;
}

.vpn-saas-hero {
    position: relative;
    overflow: hidden;
    color: #fff;
    background: var(--brand-gradient);
    border-radius: 0 0 42px 42px;
}

.vpn-saas-hero::after {
    content: "";
    position: absolute;
    right: -12%;
    bottom: -30%;
    width: 62%;
    height: 78%;
    background: rgba(255, 255, 255, 0.13);
    transform: skewY(-10deg);
    border-radius: 56px;
}

.hero-inner {
    position: relative;
    z-index: 1;
    width: min(100% - 36px, 1180px);
    margin: 0 auto;
    padding: 72px 0 78px;
    display: grid;
    gap: 42px;
    align-items: center;
}

.hero-copy h1 {
    font-size: clamp(38px, 8vw, 72px);
    line-height: 1.06;
    letter-spacing: -0.06em;
    margin: 16px 0 20px;
}

.hero-copy p {
    max-width: 620px;
    color: rgba(255, 255, 255, 0.88);
    font-size: 18px;
}

.hero-label {
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.24);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    margin-top: 28px;
}

.hero-note {
    color: rgba(255, 255, 255, 0.78);
    font-size: 14px;
}

.trust-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.trust-tags span,
.float-card,
.data-tag {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    font-weight: 700;
}

.trust-tags span {
    padding: 8px 12px;
    color: rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.14);
}

.hero-visual {
    position: relative;
    min-height: 360px;
    display: grid;
    place-items: center;
}

.product-frame {
    position: relative;
    width: min(420px, 92%);
    padding: 18px;
    border-radius: 34px;
    background: rgba(255, 255, 255, 0.16);
    border: 1px solid rgba(255, 255, 255, 0.28);
    box-shadow: 0 26px 70px rgba(18, 34, 74, 0.22);
    backdrop-filter: blur(14px);
}

.product-frame img {
    border-radius: 26px;
    box-shadow: 0 24px 60px rgba(12, 26, 64, 0.22);
    background: #fff;
}

.float-card {
    position: absolute;
    padding: 10px 14px;
    color: #1D2939;
    background: rgba(255, 255, 255, 0.94);
    box-shadow: var(--shadow-soft);
    font-size: 13px;
}

.float-card.one { left: 0; top: 34px; }
.float-card.two { right: 0; top: 95px; }
.float-card.three { left: 8px; bottom: 58px; }
.float-card.four { right: 20px; bottom: 10px; }

.product-highlights {
    margin-top: -34px;
    position: relative;
    z-index: 2;
}

.highlight-grid,
.feature-grid,
.policy-grid,
.device-grid,
.protocol-grid,
.risk-grid,
.faq-grid,
.related-grid,
.check-grid {
    display: grid;
    gap: 18px;
}

.highlight-card,
.feature-card,
.policy-card,
.device-card,
.protocol-card,
.risk-card,
.faq-item,
.related-card,
.check-card,
.info-card,
.step-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-soft);
}

.highlight-card {
    padding: 24px;
}

.highlight-card .tag {
    display: inline-flex;
    padding: 5px 10px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--blue);
    font-weight: 800;
    font-size: 12px;
    margin-bottom: 16px;
}

.highlight-card h2,
.feature-card h2,
.policy-card h2,
.risk-card h2,
.step-card h2 {
    font-size: 20px;
    margin: 0 0 8px;
}

.highlight-card p,
.feature-card p,
.policy-card p,
.device-card p,
.protocol-card p,
.risk-card p,
.step-card p {
    color: var(--muted);
}

.vpn-connection-section,
.high-speed-section,
.global-nodes-section,
.multi-device-section,
.encryption-protocol-section {
    display: grid;
    gap: 28px;
    align-items: center;
}

.feature-panel {
    padding: 26px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.feature-panel h2,
.privacy-panel h2,
.cta-section h2,
.page-hero h1 {
    font-size: clamp(28px, 5vw, 48px);
    line-height: 1.15;
    margin: 12px 0 16px;
    letter-spacing: -0.04em;
}

.feature-panel p,
.privacy-panel p,
.cta-section p,
.page-hero p,
.article-content p {
    color: var(--muted);
    font-size: 16px;
}

.feature-list {
    display: grid;
    gap: 12px;
    margin: 22px 0;
}

.feature-list span,
.mini-list span {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    color: #344054;
}

.feature-list span::before,
.mini-list span::before {
    content: "";
    flex: 0 0 8px;
    height: 8px;
    border-radius: 999px;
    background: var(--blue);
    margin-top: 10px;
}

.image-card {
    padding: 18px;
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, #fff 0%, #F4F8FF 100%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.image-card img {
    border-radius: 24px;
    margin: 0 auto;
}

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

.speed-card {
    border-radius: var(--radius-lg);
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.speed-card .speed-body {
    padding: 26px;
}

.speed-metrics {
    display: grid;
    gap: 12px;
    margin-top: 20px;
}

.speed-metric {
    padding: 14px;
    border-radius: 18px;
    background: #F6F9FF;
    border: 1px solid var(--line);
}

.speed-metric strong {
    display: block;
    color: var(--text);
}

.speed-metric span {
    color: var(--muted);
    font-size: 14px;
}

.privacy-protection-section {
    background: #fff;
}

.privacy-panel {
    padding: 30px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #FFFFFF 0%, #F3F7FF 100%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.privacy-layout {
    display: grid;
    gap: 22px;
    align-items: center;
}

.data-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 20px 0;
}

.data-tag {
    padding: 8px 12px;
    background: #fff;
    color: var(--blue);
    border: 1px solid #D9E8FF;
}

.policy-grid {
    margin-top: 24px;
}

.policy-card,
.device-card,
.protocol-card,
.risk-card,
.related-card,
.check-card,
.info-card,
.step-card {
    padding: 22px;
}

.no-log-policy-section .policy-card {
    border-top: 4px solid var(--blue);
}

.device-card img,
.protocol-card img {
    border-radius: 20px;
    margin-bottom: 18px;
}

.protocol-card {
    background: linear-gradient(180deg, #fff 0%, #F8FBFF 100%);
}

.tech-lines {
    display: grid;
    gap: 10px;
    margin-top: 18px;
}

.tech-lines span {
    padding: 12px 14px;
    border-radius: 16px;
    background: #F3F7FF;
    border: 1px solid #E1EAFE;
    color: #344054;
}

.process-steps {
    display: grid;
    gap: 16px;
    margin-top: 28px;
}

.step-card {
    position: relative;
    overflow: hidden;
}

.step-number {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    background: var(--brand-gradient);
    color: #fff;
    font-weight: 900;
    margin-bottom: 16px;
}

.risk-grid {
    margin-top: 28px;
}

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

.risk-card .advice {
    margin-top: 10px;
    padding: 10px 12px;
    border-radius: 14px;
    background: #F6F9FF;
    color: #344054;
    font-size: 14px;
}

.faq-grid {
    margin-top: 28px;
}

.faq-item {
    padding: 22px;
}

.faq-item h2,
.faq-item h3 {
    margin: 0 0 10px;
    font-size: 19px;
}

.faq-item p {
    color: var(--muted);
}

.cta-section {
    position: relative;
    overflow: hidden;
    margin: 30px auto 74px;
    width: min(100% - 36px, 1180px);
    padding: 54px 24px;
    border-radius: 36px;
    text-align: center;
    color: #fff;
    background: var(--brand-gradient);
}

.cta-section p {
    max-width: 690px;
    margin: 0 auto 24px;
    color: rgba(255, 255, 255, 0.88);
}

.cta-section .download-btn {
    background: #2980FE;
    border: 1px solid rgba(255, 255, 255, 0.28);
}

.page-hero {
    padding: 58px 0 36px;
    background: linear-gradient(180deg, #F1F6FF 0%, #FAFBFF 100%);
}

.page-hero .page-hero-card {
    padding: 30px;
    border-radius: var(--radius-lg);
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
}

.page-layout {
    display: grid;
    gap: 26px;
    align-items: start;
    padding: 40px 0 70px;
}

.article-content {
    display: grid;
    gap: 22px;
}

.article-card {
    padding: 26px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.article-card h2 {
    margin: 0 0 12px;
    font-size: 24px;
    letter-spacing: -0.02em;
}

.article-card h3 {
    margin: 18px 0 8px;
}

.side-panel {
    display: grid;
    gap: 18px;
}

.sidebar-card {
    padding: 22px;
    border-radius: var(--radius-md);
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
}

.sidebar-card h2 {
    font-size: 20px;
    margin: 0 0 12px;
}

.sidebar-card a {
    display: block;
    padding: 10px 0;
    border-bottom: 1px solid var(--line);
    color: var(--blue);
    font-weight: 700;
}

.sidebar-card a:last-child {
    border-bottom: 0;
}

.check-grid {
    margin-top: 18px;
}

.check-card {
    background: #F9FBFF;
}

.check-card strong {
    display: block;
    margin-bottom: 6px;
}

.download-steps {
    counter-reset: step;
    display: grid;
    gap: 14px;
    margin-top: 22px;
}

.download-steps li {
    list-style: none;
    position: relative;
    padding: 18px 18px 18px 64px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-soft);
}

.download-steps li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 18px;
    top: 18px;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    color: #fff;
    font-weight: 900;
    background: var(--brand-gradient);
}

.site-footer {
    background: #101828;
    color: #D0D5DD;
    padding-top: 52px;
}

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

.footer-brand {
    color: #fff;
    margin-bottom: 14px;
}

.site-footer h2 {
    color: #fff;
    font-size: 16px;
    margin: 0 0 12px;
}

.site-footer a {
    display: block;
    color: #D0D5DD;
    margin: 8px 0;
}

.site-footer a:hover {
    color: #fff;
}

.footer-bottom {
    width: min(100% - 36px, 1180px);
    margin: 32px auto 0;
    padding: 20px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: #98A2B3;
    font-size: 14px;
}

@media (min-width: 640px) {
    .highlight-grid,
    .policy-grid,
    .device-grid,
    .protocol-grid,
    .faq-grid,
    .related-grid,
    .check-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .risk-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .speed-metrics {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .nav-toggle-label {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        width: auto;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        gap: 4px;
        align-items: center;
    }

    .site-nav a {
        padding: 9px 11px;
        font-size: 14px;
        white-space: nowrap;
    }

    .hero-inner {
        grid-template-columns: 1.02fr .98fr;
        padding: 92px 0 100px;
    }

    .vpn-connection-section,
    .high-speed-section,
    .global-nodes-section,
    .multi-device-section,
    .encryption-protocol-section,
    .privacy-layout {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

    .policy-grid,
    .device-grid,
    .protocol-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

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

    .page-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
    }

    .footer-grid {
        grid-template-columns: 1.4fr repeat(3, 1fr);
    }

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

@media (min-width: 1180px) {
    .site-nav a {
        padding: 9px 13px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .container,
    .narrow-container,
    .hero-inner,
    .cta-section {
        width: min(100% - 28px, 1180px);
    }

    .page-section {
        padding: 50px 0;
    }

    .feature-panel,
    .privacy-panel,
    .article-card,
    .page-hero .page-hero-card {
        padding: 22px;
    }

    .hero-visual {
        min-height: 300px;
    }

    .float-card {
        position: static;
        margin: 10px 4px 0;
        display: inline-flex;
    }

    .product-frame {
        width: 100%;
    }

    .download-btn {
        width: 100%;
        max-width: 320px;
    }
}