* {
    box-sizing: border-box;
}

:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1F2937;
    --muted: #64748B;
    --light: #F5F7FB;
    --line: #E5EAF3;
    --card: #FFFFFF;
    --soft-blue: #EEF5FF;
    --shadow: 0 18px 50px rgba(28, 54, 114, 0.08);
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", 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;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    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: #16213E;
    white-space: nowrap;
}

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

.main-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 6px;
    padding: 12px 0 18px;
}

.main-nav a {
    color: #394150;
    font-size: 15px;
    padding: 10px 12px;
    border-radius: 12px;
}

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

.nav-download {
    color: var(--blue) !important;
    background: #EDF5FF;
    font-weight: 700;
}

.nav-toggle {
    display: none;
}

.nav-toggle-label {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 0 10px;
    cursor: pointer;
}

.nav-toggle-label span {
    height: 2px;
    background: #24324B;
    border-radius: 10px;
}

.nav-toggle:checked ~ .main-nav {
    display: flex;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    width: auto;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 12px;
}

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

.section {
    padding: 58px 0;
}

.section-light {
    background: #F6F8FC;
}

.section-title {
    max-width: 760px;
    margin-bottom: 26px;
}

.section-title.center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.section-title .eyebrow,
.eyebrow {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border-radius: 999px;
    background: #EAF3FF;
    color: var(--blue);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
}

h1, h2, h3 {
    margin: 0 0 14px;
    color: #142033;
    line-height: 1.22;
}

h1 {
    font-size: clamp(32px, 8vw, 58px);
    letter-spacing: -0.04em;
}

h2 {
    font-size: clamp(26px, 5vw, 40px);
    letter-spacing: -0.03em;
}

h3 {
    font-size: 21px;
}

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

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #FFFFFF;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(41, 128, 254, 0.24);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 18px 36px rgba(23, 104, 232, 0.28);
}

.vpn-network-hero {
    position: relative;
    overflow: hidden;
    background: var(--gradient);
    color: #fff;
    padding: 62px 0 44px;
}

.vpn-network-hero::before,
.vpn-network-hero::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    filter: blur(12px);
}

.vpn-network-hero::before {
    width: 320px;
    height: 320px;
    right: -80px;
    top: 30px;
}

.vpn-network-hero::after {
    width: 260px;
    height: 260px;
    left: -100px;
    bottom: -60px;
}

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

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

.hero-copy p {
    font-size: 18px;
    opacity: .92;
    max-width: 660px;
}

.hero-tags,
.visual-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0 26px;
}

.hero-tags span,
.visual-tags span,
.inline-tags span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.18);
    color: #fff;
    border: 1px solid rgba(255,255,255,.22);
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    min-height: 310px;
}

.hero-panel {
    position: relative;
    padding: 18px;
    border-radius: 32px;
    background: rgba(255,255,255,.18);
    border: 1px solid rgba(255,255,255,.28);
    box-shadow: 0 30px 80px rgba(22, 27, 84, .24);
}

.hero-panel img {
    border-radius: 24px;
    background: rgba(255,255,255,.18);
}

.status-card {
    position: absolute;
    background: #fff;
    color: #1D2A44;
    border-radius: 18px;
    box-shadow: 0 18px 40px rgba(31,41,55,.18);
    padding: 12px 14px;
    font-weight: 800;
    font-size: 14px;
}

.status-card small {
    display: block;
    color: var(--muted);
    font-weight: 600;
}

.card-a { top: 18px; left: 4px; }
.card-b { right: 0; top: 46%; }
.card-c { left: 24px; bottom: 18px; }
.card-d { right: 18px; bottom: -10px; }

.node-overview {
    position: relative;
    margin-top: -28px;
    z-index: 3;
}

.node-overview-grid,
.card-grid,
.risk-grid,
.faq-grid,
.policy-grid {
    display: grid;
    gap: 18px;
}

.node-card,
.info-card,
.risk-card,
.faq-item,
.step-card,
.policy-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    box-shadow: var(--shadow);
}

.node-card .tag,
.info-card .tag,
.risk-card .tag {
    display: inline-flex;
    padding: 5px 10px;
    border-radius: 999px;
    background: #EAF3FF;
    color: var(--blue);
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 10px;
}

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

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

.media-card {
    border-radius: 30px;
    overflow: hidden;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 14px;
}

.media-card img {
    border-radius: 22px;
}

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

.feature-list li {
    padding: 14px 16px;
    border-left: 4px solid var(--blue);
    border-radius: 16px;
    background: #F7FAFF;
    color: #42526A;
}

.vpn-connection-section,
.global-nodes-section,
.high-speed-section,
.privacy-protection-section,
.no-log-policy-section,
.multi-device-section,
.encryption-protocol-section {
    position: relative;
}

.map-panel {
    position: relative;
    overflow: hidden;
    border-radius: 32px;
    padding: 28px;
    background:
        radial-gradient(circle at 20% 30%, rgba(41,128,254,.18), transparent 28%),
        radial-gradient(circle at 80% 65%, rgba(184,77,218,.16), transparent 30%),
        #F7FAFF;
    border: 1px solid var(--line);
}

.map-dots {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.map-dots span {
    display: block;
    padding: 12px 14px;
    border-radius: 16px;
    background: #fff;
    border: 1px solid var(--line);
    color: #334155;
    font-weight: 700;
}

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

.speed-line {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 15px;
}

.speed-line b {
    display: block;
    color: #16213E;
}

.speed-line span {
    display: block;
    height: 8px;
    border-radius: 999px;
    background: linear-gradient(90deg, #2980FE, #9A6BFF);
    margin-top: 10px;
}

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

.privacy-panel ul,
.tech-panel ul,
.check-list {
    margin: 18px 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 12px;
}

.privacy-panel li,
.tech-panel li,
.check-list li {
    padding: 13px 14px;
    border-radius: 16px;
    background: #F8FAFD;
    color: #475569;
}

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

.step-card {
    position: relative;
    padding-left: 72px;
}

.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 22px;
    top: 24px;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--blue);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 900;
}

.risk-card {
    border-left: 5px solid var(--blue);
}

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

.cta-section {
    padding: 60px 0;
    background: var(--gradient);
    color: #fff;
    text-align: center;
}

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

.cta-box {
    width: min(820px, calc(100% - 32px));
    margin: 0 auto;
}

.page-hero {
    background:
        radial-gradient(circle at 14% 20%, rgba(41,128,254,.16), transparent 28%),
        radial-gradient(circle at 86% 18%, rgba(184,77,218,.15), transparent 25%),
        #F7FAFF;
    padding: 52px 0 36px;
    border-bottom: 1px solid var(--line);
}

.page-hero p {
    max-width: 760px;
    font-size: 17px;
}

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

.article-card,
.side-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 26px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.article-card + .article-card {
    margin-top: 20px;
}

.callout {
    background: #F4F8FF;
    border: 1px solid #DCEAFF;
    border-left: 5px solid var(--blue);
    border-radius: 20px;
    padding: 18px;
    margin: 18px 0;
}

.download-strip {
    margin-top: 22px;
    padding: 22px;
    border-radius: 24px;
    background: #F7FAFF;
    border: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
}

.simple-list {
    display: grid;
    gap: 12px;
    padding: 0;
    margin: 18px 0;
    list-style: none;
}

.simple-list li {
    padding: 14px 16px;
    border-radius: 16px;
    background: #F8FAFD;
    border: 1px solid var(--line);
}

.site-footer {
    background: #111827;
    color: #E5E7EB;
    padding: 42px 0;
}

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

.footer-brand {
    display: flex;
    gap: 14px;
    align-items: center;
}

.footer-brand img {
    width: 48px;
    height: 48px;
    border-radius: 16px;
}

.footer-brand p,
.footer-note {
    color: #AAB4C5;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 24px 0;
}

.footer-links a {
    color: #DCE5F5;
    padding: 8px 10px;
    border-radius: 12px;
    background: rgba(255,255,255,.06);
}

@media (min-width: 720px) {
    .node-overview-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .card-grid,
    .risk-grid,
    .faq-grid,
    .policy-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .download-strip {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

@media (min-width: 980px) {
    .site-header {
        position: sticky;
    }

    .header-inner {
        min-height: 78px;
    }

    .nav-toggle-label {
        display: none;
    }

    .main-nav {
        display: flex;
        width: auto;
        flex-direction: row;
        align-items: center;
        gap: 2px;
        padding: 0;
    }

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

    .hero-grid {
        grid-template-columns: 1.04fr .96fr;
        min-height: 540px;
    }

    .vpn-network-hero {
        padding: 70px 0 70px;
    }

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

    .split-section {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 48px;
    }

    .split-section.reverse .media-card {
        order: 2;
    }

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

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

    .faq-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .section {
        padding: 82px 0;
    }
}

@media (min-width: 1180px) {
    .main-nav a {
        padding: 10px 12px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .header-inner,
    .content-container,
    .footer-inner {
        width: min(100% - 24px, 1120px);
    }

    .vpn-network-hero {
        padding-top: 42px;
    }

    .hero-tags span,
    .visual-tags span,
    .inline-tags span {
        font-size: 12px;
    }

    .status-card {
        position: static;
        display: inline-block;
        margin: 8px 8px 0 0;
    }

    .hero-visual {
        min-height: auto;
    }

    .download-btn {
        width: 100%;
    }

    .article-card,
    .side-card,
    .node-card,
    .info-card,
    .risk-card,
    .faq-item,
    .step-card,
    .policy-card {
        border-radius: 20px;
        padding: 18px;
    }
}