* {
    box-sizing: border-box;
}

:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f6f8fc;
    --line: #e6eaf2;
    --white: #ffffff;
    --shadow: 0 18px 42px rgba(30, 64, 175, 0.12);
    --radius: 24px;
}

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;
}

.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(14px);
    border-bottom: 1px solid rgba(230, 234, 242, 0.9);
}

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

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #101828;
    white-space: nowrap;
}

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

.primary-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
    flex-wrap: wrap;
}

.primary-nav a {
    padding: 9px 12px;
    border-radius: 999px;
    color: #344054;
    font-size: 14px;
    transition: background .2s ease, color .2s ease;
}

.primary-nav a:hover,
.primary-nav a.active {
    background: #eef4ff;
    color: var(--blue);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 12px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #ffffff;
    font-weight: 700;
    box-shadow: 0 14px 30px rgba(41, 128, 254, 0.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    background: var(--blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 18px 36px rgba(23, 104, 232, 0.32);
}

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

.vpn-network-hero {
    position: relative;
    color: #ffffff;
    background: var(--gradient);
    padding: 76px 0 66px;
    overflow: hidden;
}

.vpn-network-hero::before,
.vpn-network-hero::after {
    content: "";
    position: absolute;
    inset: auto;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.18);
    filter: blur(4px);
    pointer-events: none;
}

.vpn-network-hero::before {
    width: 440px;
    height: 440px;
    right: -160px;
    top: -180px;
}

.vpn-network-hero::after {
    width: 280px;
    height: 280px;
    left: -120px;
    bottom: -120px;
}

.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
}

.hero-content h1 {
    margin: 0 0 18px;
    font-size: clamp(34px, 7vw, 62px);
    line-height: 1.08;
    letter-spacing: -0.04em;
}

.hero-content p {
    margin: 0 0 24px;
    color: rgba(255, 255, 255, 0.88);
    font-size: 17px;
    max-width: 650px;
}

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

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

.hero-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

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

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

.network-lines {
    position: absolute;
    inset: 0;
    border-radius: 32px;
    background:
        radial-gradient(circle at 20% 30%, rgba(255,255,255,.32) 0 3px, transparent 4px),
        radial-gradient(circle at 72% 24%, rgba(255,255,255,.28) 0 4px, transparent 5px),
        radial-gradient(circle at 62% 76%, rgba(255,255,255,.28) 0 3px, transparent 4px),
        linear-gradient(135deg, transparent 20%, rgba(255,255,255,.22) 21%, transparent 22%, transparent 52%, rgba(255,255,255,.18) 53%, transparent 54%);
    opacity: .8;
}

.product-card {
    position: relative;
    width: min(440px, 86vw);
    padding: 22px;
    border-radius: 34px;
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.26);
    box-shadow: 0 28px 80px rgba(18, 29, 88, 0.24);
    backdrop-filter: blur(14px);
}

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

.float-badge {
    position: absolute;
    z-index: 2;
    padding: 10px 14px;
    border-radius: 16px;
    color: #344054;
    background: rgba(255, 255, 255, 0.92);
    box-shadow: var(--shadow);
    font-weight: 700;
    font-size: 13px;
}

.float-badge.one { top: 10px; left: 0; }
.float-badge.two { right: 0; top: 76px; }
.float-badge.three { left: 18px; bottom: 42px; }
.float-badge.four { right: 28px; bottom: 6px; }

.section {
    padding: 72px 0;
}

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

.section-title {
    margin: 0 0 14px;
    font-size: clamp(26px, 4vw, 42px);
    line-height: 1.2;
    letter-spacing: -0.03em;
    color: #101828;
}

.section-lead {
    margin: 0 0 30px;
    color: var(--muted);
    max-width: 780px;
}

.node-overview {
    margin-top: -34px;
    position: relative;
    z-index: 4;
}

.node-overview .overview-grid,
.card-grid,
.risk-grid,
.process-steps,
.faq-grid,
.footer-grid,
.feature-grid,
.download-steps,
.about-grid {
    display: grid;
    gap: 18px;
}

.overview-card,
.node-card,
.info-card,
.risk-card,
.step-card,
.faq-item,
.page-card,
.safety-panel,
.protocol-card,
.device-card {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 12px 30px rgba(16, 24, 40, 0.06);
}

.overview-card .tag,
.node-card .tag,
.page-badge,
.info-card .tag {
    display: inline-flex;
    color: var(--blue);
    background: #eef4ff;
    border-radius: 999px;
    padding: 5px 10px;
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 12px;
}

.overview-card h3,
.node-card h3,
.info-card h3,
.risk-card h3,
.step-card h3,
.faq-item h3,
.page-card h3,
.protocol-card h3,
.device-card h3 {
    margin: 0 0 8px;
    color: #101828;
    line-height: 1.35;
}

.overview-card p,
.node-card p,
.info-card p,
.risk-card p,
.step-card p,
.faq-item p,
.page-card p,
.protocol-card p,
.device-card p,
.safety-panel p {
    margin: 0;
    color: var(--muted);
}

.text-link {
    display: inline-flex;
    margin-top: 14px;
    color: var(--blue);
    font-weight: 700;
}

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

.section-image {
    border-radius: 30px;
    background: #ffffff;
    border: 1px solid var(--line);
    padding: 18px;
    box-shadow: var(--shadow);
}

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

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

.bullet-list li,
.check-list li,
.clean-list li {
    position: relative;
    padding-left: 24px;
    color: #475467;
}

.bullet-list li::before,
.check-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .75em;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--blue);
}

.map-panel {
    min-height: 330px;
    border-radius: 32px;
    padding: 26px;
    border: 1px solid rgba(41, 128, 254, 0.18);
    background:
        radial-gradient(circle at 20% 28%, rgba(41,128,254,.18) 0 4px, transparent 5px),
        radial-gradient(circle at 72% 34%, rgba(123,78,241,.18) 0 5px, transparent 6px),
        radial-gradient(circle at 52% 74%, rgba(184,77,218,.16) 0 4px, transparent 5px),
        linear-gradient(135deg, #ffffff 0%, #f2f6ff 100%);
    box-shadow: var(--shadow);
    display: grid;
    align-content: end;
}

.map-panel img {
    margin: auto;
    max-height: 220px;
}

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

.speed-line {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 14px;
}

.speed-line span {
    display: block;
    height: 8px;
    border-radius: 999px;
    margin-top: 10px;
    background: linear-gradient(90deg, #dbeafe, var(--blue));
}

.privacy-panel {
    background: #ffffff;
    border-radius: 30px;
    border: 1px solid var(--line);
    padding: 24px;
    box-shadow: var(--shadow);
}

.privacy-panel img {
    margin: 0 auto 20px;
    border-radius: 20px;
}

.no-log-policy-section .card-grid,
.encryption-protocol-section .card-grid,
.device-grid {
    margin-top: 20px;
}

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

.step-card {
    position: relative;
    padding-top: 54px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    left: 22px;
    top: 18px;
    color: var(--blue);
    font-weight: 900;
    font-size: 18px;
}

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

.risk-card .suggestion {
    margin-top: 10px;
    color: #344054;
    font-weight: 700;
}

.faq-item {
    box-shadow: none;
}

.cta-section {
    padding: 70px 0;
    background: var(--gradient);
    color: #ffffff;
    text-align: center;
}

.cta-section h2 {
    margin: 0 0 12px;
    font-size: clamp(28px, 4vw, 44px);
    letter-spacing: -0.03em;
}

.cta-section p {
    margin: 0 auto 22px;
    color: rgba(255,255,255,.86);
    max-width: 700px;
}

.page-hero {
    padding: 58px 0;
    background: linear-gradient(180deg, #f5f8ff 0%, #ffffff 100%);
    border-bottom: 1px solid var(--line);
}

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

.page-hero h1 {
    margin: 0 0 12px;
    font-size: clamp(30px, 5vw, 50px);
    line-height: 1.16;
    letter-spacing: -0.03em;
}

.page-hero p {
    margin: 0;
    color: var(--muted);
    max-width: 760px;
}

.page-layout {
    display: grid;
    gap: 24px;
    padding: 58px 0;
}

.article-panel {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: 0 12px 34px rgba(16, 24, 40, .06);
}

.article-panel h2 {
    margin: 0 0 12px;
    color: #101828;
}

.article-panel p {
    color: #475467;
}

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

.notice-box {
    padding: 18px;
    border-radius: 22px;
    background: #f6f8fc;
    border: 1px solid var(--line);
}

.notice-box strong {
    display: block;
    color: #101828;
    margin-bottom: 8px;
}

.download-page-card {
    text-align: center;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 32px;
    padding: 34px 24px;
    box-shadow: var(--shadow);
}

.download-page-card h1 {
    margin-top: 0;
}

.download-steps {
    margin-top: 28px;
}

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

.site-footer {
    background: #111827;
    color: #d1d5db;
    padding: 54px 0 24px;
}

.site-footer a {
    display: block;
    color: #d1d5db;
    margin: 8px 0;
}

.site-footer h3 {
    color: #ffffff;
    margin: 0 0 12px;
}

.footer-logo,
.footer-logo span {
    color: #ffffff;
}

.footer-brand p {
    color: #9ca3af;
}

.footer-bottom {
    margin-top: 28px;
    border-top: 1px solid rgba(255,255,255,.12);
    padding-top: 18px;
    color: #9ca3af;
    font-size: 14px;
}

@media (max-width: 760px) {
    .container {
        width: min(100% - 24px, 1120px);
    }

    .header-inner {
        align-items: flex-start;
        padding: 12px 0;
        flex-direction: column;
    }

    .primary-nav {
        justify-content: flex-start;
        width: 100%;
        gap: 4px;
    }

    .primary-nav a {
        padding: 8px 10px;
        font-size: 13px;
    }

    .vpn-network-hero {
        padding: 46px 0 54px;
    }

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

    .float-badge {
        position: static;
        display: inline-flex;
        margin: 6px;
    }

    .product-card {
        margin-top: 10px;
    }

    .section {
        padding: 52px 0;
    }

    .page-layout {
        padding: 42px 0;
    }
}

@media (min-width: 680px) {
    .overview-grid,
    .card-grid,
    .risk-grid,
    .process-steps,
    .faq-grid,
    .download-steps,
    .about-grid,
    .feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 920px) {
    .hero-grid,
    .vpn-connection-section,
    .global-nodes-section,
    .high-speed-section,
    .privacy-protection-section,
    .multi-device-section,
    .encryption-protocol-section,
    .download-main {
        grid-template-columns: 1.02fr .98fr;
    }

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

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

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

    .footer-grid {
        grid-template-columns: 1.35fr repeat(3, minmax(0, .75fr));
    }

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

    .no-log-policy-section .card-grid,
    .encryption-protocol-section .card-grid,
    .device-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}