* {
    box-sizing: border-box;
}

:root {
    --brand-blue: #2980FE;
    --brand-blue-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #1F2937;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E5E7EF;
    --white: #FFFFFF;
    --soft-blue: #EEF5FF;
    --shadow: 0 18px 50px rgba(37, 60, 120, 0.12);
    --radius: 24px;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    color: var(--text);
    background: #FFFFFF;
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid rgba(229, 231, 239, 0.9);
    backdrop-filter: blur(16px);
}

.header-inner {
    width: min(1180px, calc(100% - 32px));
    min-height: 72px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #172554;
    letter-spacing: -0.02em;
}

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

.primary-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    padding: 14px;
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.primary-nav.is-open {
    display: grid;
    gap: 6px;
}

.primary-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #344054;
    font-size: 15px;
}

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

.nav-toggle {
    border: 1px solid var(--line);
    background: #FFFFFF;
    color: #344054;
    padding: 8px 12px;
    border-radius: 12px;
    font-size: 14px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--brand-blue);
    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: var(--brand-blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 18px 32px rgba(23, 104, 232, 0.3);
}

.section {
    padding: 68px 0;
}

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

.section-title {
    max-width: 720px;
    margin: 0 auto 32px;
    text-align: center;
}

.section-title .eyebrow,
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--brand-blue);
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 0.02em;
    background: var(--soft-blue);
    padding: 5px 12px;
    border-radius: 999px;
}

.section-title h2,
.feature-copy h2,
.content-main h2 {
    margin: 12px 0 12px;
    font-size: clamp(28px, 4vw, 42px);
    line-height: 1.18;
    letter-spacing: -0.04em;
    color: #111827;
}

.section-title p,
.feature-copy p,
.content-main p {
    color: var(--muted);
}

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

.vpn-network-hero::before,
.vpn-network-hero::after {
    content: "";
    position: absolute;
    inset: auto;
    pointer-events: none;
}

.vpn-network-hero::before {
    width: 520px;
    height: 520px;
    right: -160px;
    top: -170px;
    background: radial-gradient(circle, rgba(255,255,255,0.28), transparent 58%);
}

.vpn-network-hero::after {
    left: 0;
    right: 0;
    bottom: 0;
    height: 220px;
    opacity: 0.35;
    background-image:
        linear-gradient(90deg, rgba(255,255,255,.28) 1px, transparent 1px),
        linear-gradient(0deg, rgba(255,255,255,.2) 1px, transparent 1px);
    background-size: 72px 72px;
}

.hero-inner {
    position: relative;
    z-index: 1;
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 72px 0;
    display: grid;
    gap: 34px;
    align-items: center;
}

.hero-copy h1 {
    margin: 0 0 18px;
    font-size: clamp(36px, 8vw, 68px);
    line-height: 1.04;
    letter-spacing: -0.06em;
}

.hero-copy p {
    max-width: 620px;
    margin: 0 0 24px;
    color: rgba(255,255,255,.86);
    font-size: 17px;
}

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

.hero-tags {
    margin-top: 22px;
}

.hero-tags span,
.float-tags span,
.inline-tags span {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 7px 12px;
    font-size: 13px;
    font-weight: 700;
}

.hero-tags span {
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
}

.hero-visual {
    position: relative;
    min-height: 320px;
    border-radius: 34px;
    padding: 28px;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.22);
    box-shadow: 0 26px 70px rgba(22, 22, 70, 0.22);
}

.hero-visual img {
    margin: 0 auto;
    border-radius: 28px;
    filter: drop-shadow(0 30px 42px rgba(0,0,0,.18));
}

.float-tags span {
    position: absolute;
    color: #172554;
    background: rgba(255,255,255,.95);
    box-shadow: 0 12px 26px rgba(30, 41, 59, .16);
}

.float-tags span:nth-child(1) { left: 18px; top: 24px; }
.float-tags span:nth-child(2) { right: 20px; top: 54px; }
.float-tags span:nth-child(3) { left: 28px; bottom: 46px; }
.float-tags span:nth-child(4) { right: 28px; bottom: 28px; }

.node-overview {
    margin-top: -34px;
    position: relative;
    z-index: 2;
}

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

.node-card {
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 22px;
    box-shadow: 0 14px 34px rgba(15, 23, 42, .08);
}

.node-card strong {
    display: inline-flex;
    color: var(--brand-blue);
    background: var(--soft-blue);
    border-radius: 999px;
    padding: 4px 10px;
    font-size: 13px;
}

.node-card h3 {
    margin: 14px 0 8px;
    font-size: 20px;
}

.node-card p {
    margin: 0 0 12px;
    color: var(--muted);
}

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

.feature-section,
.vpn-connection-section,
.global-nodes-section,
.high-speed-section,
.privacy-protection-section,
.multi-device-section,
.encryption-protocol-section {
    padding: 72px 0;
}

.feature-grid,
.split-grid {
    display: grid;
    gap: 28px;
    align-items: center;
}

.feature-media,
.panel-card,
.privacy-panel,
.tech-panel,
.map-panel {
    border-radius: 30px;
    background: #FFFFFF;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 24px;
}

.feature-media img,
.panel-card img,
.map-panel img {
    border-radius: 24px;
}

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

.feature-list li,
.check-list li {
    position: relative;
    padding-left: 26px;
    color: #344054;
}

.feature-list li::before,
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 11px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--brand-blue);
    box-shadow: 0 0 0 5px rgba(41, 128, 254, .12);
}

.global-nodes-section {
    background:
        radial-gradient(circle at 18% 20%, rgba(41,128,254,.12), transparent 28%),
        radial-gradient(circle at 80% 42%, rgba(123,78,241,.12), transparent 30%),
        #F8FAFF;
}

.map-panel {
    position: relative;
    overflow: hidden;
    background:
        linear-gradient(135deg, rgba(255,255,255,.94), rgba(255,255,255,.82)),
        repeating-linear-gradient(30deg, rgba(41,128,254,.08) 0 1px, transparent 1px 18px);
}

.node-lines {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.node-line {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 14px;
    background: rgba(255,255,255,.82);
    border: 1px solid var(--line);
    border-radius: 16px;
    color: #344054;
}

.node-line i {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--brand-blue);
    box-shadow: 0 0 0 6px rgba(41,128,254,.14);
}

.speed-cards,
.policy-grid,
.device-grid,
.protocol-grid,
.risk-grid,
.faq-grid,
.related-grid {
    display: grid;
    gap: 16px;
}

.speed-card,
.policy-card,
.device-card,
.protocol-card,
.risk-card,
.faq-item,
.related-card,
.tip-card,
.step-card {
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 22px;
    box-shadow: 0 12px 28px rgba(15,23,42,.06);
}

.speed-card h3,
.policy-card h3,
.device-card h3,
.protocol-card h3,
.risk-card h3,
.related-card h3,
.tip-card h3,
.step-card h3 {
    margin: 0 0 8px;
    color: #111827;
}

.speed-card p,
.policy-card p,
.device-card p,
.protocol-card p,
.risk-card p,
.related-card p,
.tip-card p,
.step-card p,
.faq-item p {
    margin: 0;
    color: var(--muted);
}

.privacy-panel {
    background:
        linear-gradient(180deg, #FFFFFF, #F7FAFF);
}

.inline-tags span {
    color: var(--brand-blue);
    background: var(--soft-blue);
}

.no-log-policy-section {
    padding: 72px 0;
    background: #FFFFFF;
}

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

.step-card {
    position: relative;
    padding-left: 76px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 22px;
    top: 22px;
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    color: #FFFFFF;
    background: var(--brand-blue);
    font-weight: 900;
}

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

.faq-item h3 {
    margin: 0 0 8px;
    font-size: 18px;
}

.cta-section {
    padding: 72px 0;
    background: var(--gradient);
    color: #FFFFFF;
    text-align: center;
}

.cta-section p {
    max-width: 680px;
    margin: 0 auto 24px;
    color: rgba(255,255,255,.86);
}

.cta-section h2 {
    margin: 0 0 12px;
    font-size: clamp(30px, 5vw, 48px);
    letter-spacing: -0.04em;
}

.page-hero {
    padding: 58px 0 34px;
    background:
        radial-gradient(circle at 12% 15%, rgba(41,128,254,.18), transparent 28%),
        radial-gradient(circle at 88% 20%, rgba(184,77,218,.16), transparent 26%),
        #F8FAFF;
}

.page-hero-inner {
    width: min(980px, calc(100% - 32px));
    margin: 0 auto;
}

.page-hero h1 {
    margin: 14px 0 14px;
    font-size: clamp(34px, 6vw, 56px);
    line-height: 1.12;
    letter-spacing: -0.05em;
    color: #111827;
}

.page-hero p {
    max-width: 780px;
    margin: 0;
    color: var(--muted);
    font-size: 17px;
}

.content-layout {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 44px 0 72px;
    display: grid;
    gap: 24px;
}

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

.content-main h2 {
    font-size: clamp(24px, 4vw, 34px);
}

.content-main h3 {
    margin: 24px 0 8px;
    font-size: 22px;
}

.content-main p {
    margin: 0 0 16px;
}

.side-panel {
    display: grid;
    gap: 16px;
    align-content: start;
}

.badge {
    display: inline-flex;
    width: fit-content;
    color: var(--brand-blue);
    background: var(--soft-blue);
    border-radius: 999px;
    padding: 6px 13px;
    font-weight: 800;
    font-size: 14px;
}

.action-box {
    margin-top: 24px;
    padding: 24px;
    border-radius: 24px;
    background: #F7FAFF;
    border: 1px solid var(--line);
}

.download-steps {
    display: grid;
    gap: 16px;
    margin: 28px 0;
}

.download-steps .step-card {
    box-shadow: none;
}

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

.footer-grid {
    display: grid;
    gap: 26px;
}

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

.site-footer h3 {
    color: #FFFFFF;
    margin: 0 0 12px;
    font-size: 16px;
}

.site-footer a {
    display: block;
    color: #D1D5DB;
    margin: 8px 0;
}

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

.footer-bottom {
    margin-top: 34px;
    padding: 18px 16px;
    border-top: 1px solid rgba(255,255,255,.12);
    text-align: center;
    color: #9CA3AF;
    font-size: 14px;
}

@media (min-width: 680px) {
    .node-grid,
    .policy-grid,
    .device-grid,
    .protocol-grid,
    .risk-grid,
    .faq-grid,
    .related-grid,
    .speed-cards {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .process-steps,
    .download-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1.4fr 1fr 1fr 1fr;
    }
}

@media (min-width: 960px) {
    .nav-toggle {
        display: none;
    }

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

    .primary-nav a {
        white-space: nowrap;
    }

    .hero-inner {
        grid-template-columns: 1.02fr .98fr;
        padding: 96px 0 110px;
    }

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

    .feature-grid,
    .split-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .feature-grid.reverse .feature-copy {
        order: 2;
    }

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

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

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

    .content-main {
        padding: 40px;
    }

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

@media (max-width: 420px) {
    .container,
    .header-inner,
    .hero-inner,
    .content-layout,
    .page-hero-inner {
        width: min(100% - 24px, 1120px);
    }

    .hero-visual {
        min-height: 260px;
        padding: 18px;
    }

    .float-tags span {
        position: static;
        margin: 6px 6px 0 0;
    }

    .float-tags {
        margin-top: 16px;
    }

    .content-main {
        padding: 22px;
    }

    .download-btn {
        width: 100%;
    }
}