:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #243047;
    --muted: #657086;
    --light: #F5F7FB;
    --soft: #EEF4FF;
    --border: #E5EAF2;
    --white: #FFFFFF;
    --shadow: 0 18px 50px rgba(33, 47, 90, 0.10);
    --radius: 28px;
}

* {
    box-sizing: border-box;
}

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: #FFFFFF;
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

p {
    margin: 0 0 14px;
}

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(229, 234, 242, 0.9);
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

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

.brand-text {
    white-space: nowrap;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    padding: 14px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: var(--shadow);
}

.site-nav.open {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.site-nav a {
    padding: 10px 12px;
    border-radius: 14px;
    color: #4A556A;
    font-size: 14px;
}

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

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--white);
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    width: 18px;
    height: 2px;
    background: #2B344A;
    border-radius: 999px;
    transition: 0.2s ease;
}

.nav-toggle.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.section {
    padding: 64px 0;
}

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

.section-head {
    margin-bottom: 28px;
}

.eyebrow,
.page-badge {
    display: inline-flex;
    align-items: center;
    color: var(--blue);
    background: rgba(41, 128, 254, 0.10);
    border: 1px solid rgba(41, 128, 254, 0.16);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 14px;
}

h1,
h2,
h3 {
    margin: 0;
    line-height: 1.2;
    color: #182236;
}

h1 {
    font-size: clamp(34px, 8vw, 58px);
    letter-spacing: -0.05em;
}

h2 {
    font-size: clamp(26px, 5vw, 38px);
    letter-spacing: -0.035em;
    margin-bottom: 12px;
}

h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.lead {
    font-size: 17px;
    color: #EEF4FF;
    max-width: 680px;
}

.muted {
    color: var(--muted);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    background: var(--blue);
    color: #FFFFFF;
    border-radius: 999px;
    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: 800;
}

.text-link:hover {
    color: var(--blue-dark);
}

.vpn-saas-hero {
    position: relative;
    overflow: hidden;
    padding: 58px 0 76px;
    color: #FFFFFF;
    background: var(--gradient);
}

.vpn-saas-hero::after {
    content: "";
    position: absolute;
    left: -8vw;
    right: -8vw;
    bottom: -70px;
    height: 150px;
    background: #FFFFFF;
    transform: skewY(-4deg);
    transform-origin: 0 0;
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 36px;
    align-items: center;
}

.hero-copy h1 {
    color: #FFFFFF;
    margin-bottom: 18px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin: 26px 0 22px;
}

.hero-note {
    color: rgba(255, 255, 255, 0.82);
    font-size: 14px;
}

.hero-tags,
.float-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.hero-tags span,
.float-tags span {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.16);
    border: 1px solid rgba(255, 255, 255, 0.24);
    color: rgba(255, 255, 255, 0.92);
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    min-height: 360px;
    border-radius: 34px;
    padding: 24px;
    background: rgba(255, 255, 255, 0.13);
    border: 1px solid rgba(255, 255, 255, 0.22);
    box-shadow: 0 30px 80px rgba(18, 30, 70, 0.22);
}

.hero-visual img {
    margin: 0 auto;
    border-radius: 30px;
    max-height: 420px;
    object-fit: contain;
    filter: drop-shadow(0 24px 50px rgba(21, 32, 82, 0.28));
}

.float-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.92);
    color: #1C2940;
    padding: 12px 14px;
    border-radius: 18px;
    box-shadow: var(--shadow);
    font-weight: 800;
    font-size: 13px;
}

.float-card.one {
    left: 14px;
    top: 20px;
}

.float-card.two {
    right: 14px;
    top: 88px;
}

.float-card.three {
    left: 24px;
    bottom: 78px;
}

.float-card.four {
    right: 20px;
    bottom: 22px;
}

.product-highlights {
    position: relative;
    z-index: 3;
    margin-top: -38px;
}

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

.highlight-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 22px;
    box-shadow: 0 12px 40px rgba(38, 48, 85, 0.08);
}

.highlight-card .tag,
.card-tag {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 4px 10px;
    background: rgba(41, 128, 254, 0.10);
    color: var(--blue);
    font-size: 12px;
    font-weight: 800;
    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,
.content-panel,
.privacy-panel,
.tech-panel,
.page-card,
.download-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 28px;
}

.feature-list,
.check-list,
.step-list {
    display: grid;
    gap: 12px;
    margin: 20px 0;
    padding: 0;
    list-style: none;
}

.feature-list li,
.check-list li,
.step-list li {
    position: relative;
    padding-left: 24px;
    color: #43506A;
}

.feature-list li::before,
.check-list li::before,
.step-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 11px;
    width: 8px;
    height: 8px;
    background: var(--blue);
    border-radius: 50%;
}

.image-card {
    border-radius: 32px;
    padding: 18px;
    background: linear-gradient(180deg, #F5F8FF 0%, #FFFFFF 100%);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.image-card img {
    border-radius: 24px;
    margin: 0 auto;
    max-height: 420px;
    object-fit: contain;
}

.speed-grid,
.nodes-grid,
.privacy-grid,
.no-log-grid,
.device-grid,
.protocol-grid,
.risk-grid,
.faq-grid,
.info-grid,
.related-grid {
    display: grid;
    gap: 16px;
}

.info-card,
.risk-card,
.faq-item,
.step-card,
.protocol-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 20px;
}

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

.risk-card strong,
.step-card strong {
    color: #182236;
}

.privacy-protection-section {
    background: linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 100%);
}

.privacy-combo {
    display: grid;
    gap: 18px;
}

.privacy-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.privacy-tags span {
    padding: 8px 11px;
    border-radius: 999px;
    background: #F2F6FE;
    color: #3D4A62;
    font-weight: 700;
    font-size: 13px;
}

.no-log-policy-section {
    background: #FBFCFF;
}

.multi-device-section .device-stack {
    display: grid;
    gap: 14px;
}

.device-pill {
    border-radius: 20px;
    background: #F6F9FF;
    border: 1px solid var(--border);
    padding: 16px;
}

.encryption-protocol-section {
    background: radial-gradient(circle at 20% 0%, rgba(41,128,254,0.12), transparent 30%), #FFFFFF;
}

.tech-panel {
    position: relative;
    overflow: hidden;
}

.tech-panel::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 6px;
    background: var(--gradient);
}

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

.step-card {
    position: relative;
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 12px;
    background: var(--blue);
    color: #FFFFFF;
    font-weight: 900;
    margin-bottom: 12px;
}

.cta-section {
    padding: 72px 0;
}

.cta-card {
    border-radius: 36px;
    padding: 38px 24px;
    background: var(--gradient);
    color: #FFFFFF;
    text-align: center;
    overflow: hidden;
    position: relative;
}

.cta-card h2 {
    color: #FFFFFF;
}

.cta-card p {
    color: rgba(255, 255, 255, 0.86);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.page-hero {
    padding: 56px 0 34px;
    background: linear-gradient(180deg, #F5F8FF 0%, #FFFFFF 100%);
}

.page-hero .container {
    max-width: 920px;
}

.page-hero h1 {
    margin-bottom: 16px;
}

.page-layout {
    display: grid;
    gap: 22px;
    align-items: start;
}

.article-body {
    display: grid;
    gap: 20px;
}

.side-panel {
    background: #F7FAFF;
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 22px;
}

.side-panel a {
    display: block;
    color: var(--blue);
    font-weight: 800;
    margin-top: 10px;
}

.download-page {
    padding: 62px 0;
}

.download-card {
    text-align: center;
}

.download-steps {
    display: grid;
    gap: 14px;
    margin: 28px 0;
    text-align: left;
}

.download-steps div {
    padding: 16px;
    border-radius: 18px;
    background: #F7FAFF;
    border: 1px solid var(--border);
}

.faq-list {
    display: grid;
    gap: 16px;
}

.faq-item h2,
.faq-item h3 {
    font-size: 18px;
}

.site-footer {
    background: #121A2B;
    color: rgba(255, 255, 255, 0.74);
    padding: 52px 0 24px;
}

.footer-grid {
    display: grid;
    gap: 24px;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #FFFFFF;
    font-weight: 900;
    margin-bottom: 12px;
}

.footer-brand img {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    object-fit: cover;
}

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

.site-footer a {
    display: block;
    margin: 8px 0;
    color: rgba(255, 255, 255, 0.74);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    margin-top: 32px;
    padding-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 13px;
}

@media (min-width: 640px) {
    .highlight-grid,
    .speed-grid,
    .nodes-grid,
    .privacy-grid,
    .no-log-grid,
    .device-grid,
    .protocol-grid,
    .risk-grid,
    .faq-grid,
    .info-grid,
    .related-grid,
    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .download-steps {
        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;
        box-shadow: none;
        background: transparent;
    }

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

    .hero-inner,
    .feature-split,
    .vpn-connection-section,
    .high-speed-section,
    .global-nodes-section,
    .multi-device-section,
    .page-layout {
        grid-template-columns: 1.02fr 0.98fr;
    }

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

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

    .footer-grid {
        grid-template-columns: 1.4fr 0.8fr 0.8fr 0.8fr;
    }

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

    .section {
        padding: 82px 0;
    }

    .vpn-saas-hero {
        padding: 76px 0 106px;
    }
}

@media (min-width: 1100px) {
    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .site-nav a {
        padding: 9px 12px;
    }
}

@media (max-width: 380px) {
    .container {
        width: min(100% - 24px, 1120px);
    }

    .site-nav.open {
        grid-template-columns: 1fr;
    }

    .download-btn {
        width: 100%;
    }

    .hero-actions {
        align-items: stretch;
        flex-direction: column;
    }
}