:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --text: #20293A;
    --muted: #657086;
    --light: #F5F7FB;
    --soft-blue: #EEF4FF;
    --line: #E5E9F2;
    --white: #FFFFFF;
    --shadow: 0 18px 45px rgba(37, 62, 130, 0.12);
    --radius-xl: 34px;
    --radius-lg: 26px;
    --radius-md: 18px;
}

* {
    box-sizing: border-box;
}

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: 1.7;
    overflow-x: hidden;
}

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

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

p {
    margin: 0 0 16px;
    color: var(--muted);
}

h1, h2, h3 {
    margin: 0 0 16px;
    line-height: 1.22;
    color: var(--text);
}

h1 {
    font-size: clamp(34px, 8vw, 64px);
    letter-spacing: -1.6px;
}

h2 {
    font-size: clamp(27px, 5vw, 42px);
    letter-spacing: -0.8px;
}

h3 {
    font-size: 20px;
}

.container {
    width: min(100% - 32px, 1180px);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(229, 233, 242, 0.8);
}

.nav-shell {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand, .footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -0.2px;
}

.brand-logo, .footer-logo {
    width: 42px;
    height: 42px;
    object-fit: cover;
    border-radius: 12px;
}

.brand-text {
    font-size: 22px;
}

.nav-toggle {
    border: 1px solid var(--line);
    background: var(--white);
    border-radius: 14px;
    width: 44px;
    height: 44px;
    font-size: 22px;
    color: var(--text);
}

.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 74px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: var(--white);
    box-shadow: var(--shadow);
}

.site-nav.open {
    display: grid;
    gap: 4px;
}

.site-nav a {
    padding: 12px 14px;
    border-radius: 14px;
    color: var(--muted);
    font-weight: 650;
    font-size: 15px;
}

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

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 26px;
    border-radius: 999px;
    background: var(--blue);
    color: #FFFFFF;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(41, 128, 254, 0.24);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    background: var(--blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(23, 104, 232, 0.28);
}

.section {
    padding: 74px 0;
}

.section-soft {
    background: var(--light);
}

.eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--blue);
    background: var(--soft-blue);
    font-size: 14px;
    font-weight: 800;
    margin-bottom: 18px;
}

.vpn-saas-hero {
    position: relative;
    padding: 52px 0 80px;
    color: #FFFFFF;
    overflow: hidden;
}

.vpn-saas-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--gradient);
    clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

.vpn-saas-hero::after {
    content: "";
    position: absolute;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    right: -180px;
    top: 40px;
    background: rgba(255, 255, 255, 0.18);
    filter: blur(6px);
}

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

.hero-copy h1,
.hero-copy p {
    color: #FFFFFF;
}

.hero-copy p {
    font-size: 18px;
    max-width: 640px;
    opacity: 0.92;
}

.hero-tags,
.float-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0 24px;
}

.hero-tags span,
.float-tags span,
.inline-tags span {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.16);
    color: #FFFFFF;
    font-weight: 700;
    font-size: 14px;
}

.hero-device {
    position: relative;
    max-width: 520px;
    margin: 0 auto;
}

.hero-device::before {
    content: "";
    position: absolute;
    inset: 38px -10px -8px 36px;
    border-radius: 38px;
    background: rgba(255, 255, 255, 0.22);
}

.product-visual-card {
    position: relative;
    padding: 18px;
    border-radius: 36px;
    background: rgba(255, 255, 255, 0.23);
    box-shadow: 0 30px 65px rgba(29, 45, 101, 0.22);
    backdrop-filter: blur(10px);
}

.product-visual-card img {
    width: 100%;
    border-radius: 28px;
}

.status-card {
    position: absolute;
    padding: 12px 14px;
    border-radius: 18px;
    background: #FFFFFF;
    color: var(--text);
    box-shadow: var(--shadow);
    font-weight: 800;
    font-size: 14px;
}

.status-card small {
    display: block;
    font-size: 12px;
    color: var(--muted);
    font-weight: 650;
}

.status-a { left: -8px; top: 22%; }
.status-b { right: -4px; top: 8%; }
.status-c { left: 10%; bottom: -16px; }
.status-d { right: 4%; bottom: 14%; }

.product-highlights {
    margin-top: -38px;
    position: relative;
    z-index: 2;
}

.highlight-grid,
.feature-grid,
.card-grid,
.risk-grid,
.faq-grid,
.step-grid {
    display: grid;
    gap: 18px;
}

.highlight-card,
.feature-card,
.info-card,
.risk-card,
.faq-item,
.step-card,
.tip-panel,
.side-card,
.policy-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: 0 14px 30px rgba(36, 50, 83, 0.06);
}

.highlight-card .tag,
.feature-card .tag,
.risk-card .tag {
    display: inline-flex;
    margin-bottom: 12px;
    padding: 5px 10px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
}

.text-link {
    display: inline-flex;
    color: var(--blue);
    font-weight: 800;
    margin-top: 8px;
}

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

.large-panel {
    border-radius: var(--radius-xl);
    padding: 30px;
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.visual-panel {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, #F7FAFF 0%, #EEF4FF 100%);
    padding: 22px;
    border: 1px solid var(--line);
}

.visual-panel img {
    border-radius: 26px;
    margin: 0 auto;
}

.point-list,
.check-list {
    list-style: none;
    padding: 0;
    margin: 20px 0 0;
    display: grid;
    gap: 10px;
}

.point-list li,
.check-list li {
    position: relative;
    padding-left: 28px;
    color: var(--muted);
}

.point-list li::before,
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 11px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 5px rgba(41, 128, 254, 0.12);
}

.high-speed-section .large-panel,
.global-nodes-section .large-panel {
    background: linear-gradient(180deg, #FFFFFF 0%, #F8FBFF 100%);
}

.privacy-protection-section {
    border-radius: var(--radius-xl);
    background: var(--white);
    border: 1px solid var(--line);
    padding: 26px;
    box-shadow: var(--shadow);
}

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

.privacy-cards,
.policy-grid,
.protocol-grid {
    display: grid;
    gap: 16px;
}

.no-log-policy-section {
    background: linear-gradient(135deg, #F7FAFF 0%, #FFFFFF 100%);
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    padding: 28px;
}

.process-steps {
    counter-reset: step;
}

.step-card {
    position: relative;
    padding-top: 62px;
}

.step-number {
    position: absolute;
    top: 20px;
    left: 22px;
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--blue);
    color: #FFFFFF;
    font-weight: 900;
}

.safety-panel {
    border-radius: var(--radius-xl);
    padding: 28px;
    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;
}

.cta-section {
    position: relative;
    overflow: hidden;
    padding: 64px 0;
    background: var(--gradient);
    color: #FFFFFF;
    text-align: center;
}

.cta-section h2,
.cta-section p {
    color: #FFFFFF;
}

.cta-section p {
    max-width: 720px;
    margin: 0 auto 22px;
    opacity: 0.92;
}

.page-hero {
    padding: 64px 0 38px;
    background: linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 100%);
}

.page-hero .summary {
    max-width: 780px;
    font-size: 18px;
}

.content-layout {
    display: grid;
    gap: 24px;
    align-items: start;
}

.article-body {
    max-width: 820px;
}

.article-section {
    margin-bottom: 24px;
}

.article-section h2 {
    font-size: 28px;
}

.note-box {
    margin: 24px 0;
    padding: 22px;
    border-radius: 22px;
    background: var(--soft-blue);
    border: 1px solid #DCE8FF;
}

.side-card {
    position: sticky;
    top: 94px;
}

.side-card a {
    display: block;
    padding: 10px 0;
    color: var(--blue);
    font-weight: 800;
    border-bottom: 1px solid var(--line);
}

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

.download-page-card {
    text-align: center;
    max-width: 820px;
    margin: 0 auto;
}

.download-page-card .download-btn {
    margin: 10px 0 24px;
}

.steps-list {
    display: grid;
    gap: 14px;
    padding: 0;
    list-style: none;
    margin: 24px 0 0;
}

.steps-list li {
    display: grid;
    grid-template-columns: 38px 1fr;
    gap: 12px;
    align-items: start;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #FFFFFF;
}

.steps-list span {
    width: 38px;
    height: 38px;
    border-radius: 14px;
    background: var(--soft-blue);
    color: var(--blue);
    font-weight: 900;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.site-footer {
    padding: 52px 0 24px;
    background: #111827;
    color: #D1D5DB;
}

.site-footer p,
.site-footer a {
    color: #AEB7C8;
}

.site-footer h3 {
    color: #FFFFFF;
    font-size: 16px;
}

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

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

.footer-bottom {
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
    color: #8D97AA;
}

@media (min-width: 640px) {
    .highlight-grid,
    .card-grid,
    .privacy-cards,
    .policy-grid,
    .protocol-grid,
    .faq-grid,
    .step-grid,
    .risk-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

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

    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }

    .site-nav a {
        padding: 9px 10px;
        font-size: 14px;
    }

    .hero-grid,
    .split-section,
    .vpn-connection-section,
    .high-speed-section,
    .global-nodes-section,
    .multi-device-section,
    .encryption-protocol-section,
    .privacy-layout,
    .content-layout {
        grid-template-columns: 1.05fr 0.95fr;
    }

    .hero-copy p {
        font-size: 19px;
    }

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

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

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

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

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

@media (min-width: 1120px) {
    .site-nav a {
        padding: 9px 13px;
        font-size: 15px;
    }

    .vpn-saas-hero {
        padding: 76px 0 112px;
    }

    .section {
        padding: 90px 0;
    }
}

@media (max-width: 480px) {
    .container {
        width: min(100% - 24px, 1180px);
    }

    .download-btn {
        width: 100%;
    }

    .status-card {
        position: static;
        margin-top: 10px;
    }

    .float-tags span,
    .hero-tags span {
        font-size: 13px;
    }

    .large-panel,
    .privacy-protection-section,
    .no-log-policy-section,
    .safety-panel {
        padding: 22px;
    }
}