* {
    box-sizing: border-box;
}

:root {
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --text: #202636;
    --muted: #6B7280;
    --soft: #F5F7FB;
    --soft-blue: #F0F5FF;
    --line: #E5EAF3;
    --white: #FFFFFF;
    --radius-lg: 30px;
    --radius-md: 22px;
    --shadow: 0 18px 48px rgba(24, 44, 91, 0.10);
}

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: 1.75;
    overflow-x: hidden;
}

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

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(229, 234, 243, 0.86);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 14px 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 18px;
    color: #18223C;
    white-space: nowrap;
}

.logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 8px 22px rgba(41, 128, 254, 0.18);
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 14px;
}

.site-nav a {
    padding: 8px 12px;
    border-radius: 999px;
    color: #3B4252;
}

.site-nav a:hover,
.site-nav a.active {
    background: #EEF4FF;
    color: var(--blue);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #FFFFFF;
    font-weight: 800;
    line-height: 1;
    box-shadow: 0 12px 28px rgba(41, 128, 254, 0.30);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    background: var(--blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(23, 104, 232, 0.34);
}

.section {
    padding: 64px 0;
}

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

.section-head {
    max-width: 780px;
    margin-bottom: 28px;
}

.eyebrow,
.category-badge {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 7px 12px;
    background: #ECF4FF;
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
    margin-bottom: 14px;
}

h1,
h2,
h3 {
    line-height: 1.24;
    margin: 0 0 14px;
    color: #172033;
}

h1 {
    font-size: clamp(34px, 7vw, 60px);
    letter-spacing: -1.5px;
}

h2 {
    font-size: clamp(26px, 4vw, 40px);
    letter-spacing: -0.8px;
}

h3 {
    font-size: 20px;
}

p {
    margin: 0 0 14px;
    color: var(--muted);
}

.gradient-bg {
    background: var(--brand-gradient);
}

.vpn-saas-hero {
    position: relative;
    color: #FFFFFF;
    background: var(--brand-gradient);
    overflow: hidden;
}

.vpn-saas-hero::after {
    content: "";
    position: absolute;
    left: -10%;
    right: -10%;
    bottom: -68px;
    height: 136px;
    background: #FFFFFF;
    transform: skewY(-4deg);
    transform-origin: left top;
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr;
    gap: 34px;
    padding: 72px 0 120px;
}

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

.hero-copy p {
    max-width: 640px;
    color: rgba(255, 255, 255, 0.86);
    font-size: 17px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin: 26px 0 20px;
}

.hero-tags,
.floating-tags,
.inline-tags {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.hero-tags span,
.floating-tags span,
.inline-tags span {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 7px 11px;
    font-size: 13px;
    font-weight: 700;
}

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

.hero-visual {
    position: relative;
    min-height: 360px;
}

.product-card {
    border-radius: 34px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.17);
    border: 1px solid rgba(255, 255, 255, 0.25);
    box-shadow: 0 30px 70px rgba(19, 31, 81, 0.25);
}

.product-card img {
    width: 100%;
    border-radius: 26px;
    background: rgba(255,255,255,.08);
}

.floating-status {
    position: absolute;
    right: 8px;
    bottom: 14px;
    display: grid;
    gap: 8px;
    width: min(220px, 60%);
}

.floating-status span {
    padding: 10px 14px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.94);
    color: #23304C;
    font-weight: 800;
    box-shadow: var(--shadow);
}

.product-highlights {
    position: relative;
    z-index: 3;
    margin-top: -70px;
}

.highlight-grid,
.card-grid,
.risk-grid,
.faq-grid,
.process-steps,
.page-card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}

.highlight-card,
.info-card,
.risk-card,
.faq-item,
.step-card,
.page-panel,
.tip-box,
.check-card {
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 12px 30px rgba(24, 44, 91, 0.06);
}

.highlight-card .tag,
.info-card .tag {
    display: inline-block;
    margin-bottom: 12px;
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
}

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

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

.feature-split,
.vpn-connection-section,
.high-speed-section,
.global-nodes-section,
.multi-device-section,
.encryption-protocol-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 26px;
    align-items: center;
}

.feature-panel {
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow);
}

.feature-image {
    border-radius: var(--radius-lg);
    background: linear-gradient(145deg, #F5F8FF 0%, #FFFFFF 100%);
    border: 1px solid var(--line);
    padding: 18px;
    box-shadow: var(--shadow);
}

.feature-image img {
    border-radius: 22px;
    margin: auto;
}

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

.feature-list li,
.clean-list li {
    position: relative;
    padding-left: 28px;
    color: #424B5F;
}

.feature-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 9px;
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: var(--blue);
    box-shadow: 0 0 0 5px rgba(41, 128, 254, 0.10);
}

.speed-metrics {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 20px;
}

.metric {
    padding: 18px;
    border-radius: 20px;
    background: #F5F8FF;
    border: 1px solid #E4ECFF;
}

.metric strong {
    display: block;
    color: #172033;
    font-size: 18px;
}

.global-nodes-section .node-board {
    display: grid;
    gap: 14px;
}

.node-line {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    border-radius: 18px;
    background: #FFFFFF;
    border: 1px solid var(--line);
}

.node-line span:last-child {
    color: var(--blue);
    font-weight: 800;
}

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

.privacy-board {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: center;
}

.privacy-cards,
.no-log-policy-section,
.protocol-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}

.inline-tags span {
    background: #EFF5FF;
    color: var(--blue);
}

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

.device-stack {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

.device-card {
    padding: 18px;
    border-radius: 22px;
    background: #F8FAFF;
    border: 1px solid #E6ECF7;
}

.protocol-panel {
    background: #FFFFFF;
    border-radius: var(--radius-lg);
    border: 1px solid var(--line);
    padding: 28px;
    box-shadow: var(--shadow);
}

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

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

.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    top: 18px;
    left: 22px;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    background: var(--blue);
    color: #FFFFFF;
    font-weight: 900;
    font-size: 13px;
}

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

.risk-card strong {
    display: block;
    margin: 8px 0 4px;
    color: #172033;
}

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

.cta-section {
    margin: 20px 0 72px;
}

.cta-panel {
    text-align: center;
    color: #FFFFFF;
    background: var(--brand-gradient);
    border-radius: 34px;
    padding: 46px 24px;
    overflow: hidden;
    position: relative;
}

.cta-panel::before,
.cta-panel::after {
    content: "";
    position: absolute;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.13);
}

.cta-panel::before {
    top: -70px;
    left: -40px;
}

.cta-panel::after {
    bottom: -80px;
    right: -50px;
}

.cta-panel h2,
.cta-panel p,
.cta-panel a {
    position: relative;
    z-index: 1;
}

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

.page-hero {
    padding: 56px 0 34px;
    background: linear-gradient(180deg, #F3F7FF 0%, #FFFFFF 100%);
}

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

.page-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 34px 0 72px;
}

.article-body {
    min-width: 0;
}

.article-body .page-panel + .page-panel {
    margin-top: 20px;
}

.sidebar {
    display: grid;
    gap: 18px;
    align-self: start;
}

.page-panel h2 {
    font-size: 26px;
}

.notice-panel {
    background: #F7FAFF;
    border: 1px solid #DDE8FF;
    border-radius: var(--radius-md);
    padding: 20px;
}

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

.download-page-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.site-footer {
    background: #111827;
    color: #D1D5DB;
    padding: 48px 0 26px;
}

.site-footer p,
.site-footer a,
.footer-bottom {
    color: #AEB6C7;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.footer-brand {
    color: #FFFFFF;
    font-weight: 900;
    font-size: 22px;
    margin-bottom: 10px;
}

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

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

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.10);
    margin-top: 28px;
    padding-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 13px;
}

@media (min-width: 640px) {
    .highlight-grid,
    .card-grid,
    .risk-grid,
    .faq-grid,
    .process-steps,
    .page-card-grid,
    .privacy-cards,
    .protocol-grid,
    .speed-metrics,
    .device-stack {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 860px) {
    .header-inner {
        flex-wrap: nowrap;
    }

    .hero-inner,
    .feature-split,
    .vpn-connection-section,
    .high-speed-section,
    .global-nodes-section,
    .multi-device-section,
    .encryption-protocol-section,
    .privacy-board,
    .download-page-grid {
        grid-template-columns: 1.02fr .98fr;
    }

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

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

    .no-log-policy-section,
    .protocol-grid {
        grid-template-columns: repeat(3, minmax(0, 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 (max-width: 760px) {
    .header-inner {
        align-items: flex-start;
        flex-direction: column;
    }

    .site-nav {
        justify-content: flex-start;
        width: 100%;
    }

    .site-nav a {
        padding: 7px 10px;
        font-size: 13px;
    }

    .hero-inner {
        padding: 52px 0 108px;
    }

    .floating-status {
        position: static;
        width: 100%;
        margin-top: 14px;
    }

    .section {
        padding: 46px 0;
    }

    .feature-panel,
    .protocol-panel,
    .page-panel {
        padding: 22px;
    }
}