* {
    box-sizing: border-box;
}

:root {
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --line: #e5e7eb;
    --panel: #ffffff;
    --deep: #111827;
    --soft-blue: #eef5ff;
}

html {
    scroll-behavior: smooth;
}

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;
}

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

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

p {
    margin: 0 0 16px;
}

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(229,231,235,0.9);
}

.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--deep);
}

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

.brand-name {
    font-size: 20px;
    letter-spacing: .04em;
}

.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

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

.nav-toggle-label span {
    display: block;
    height: 2px;
    background: var(--deep);
    border-radius: 10px;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 68px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: 0 18px 48px rgba(15,23,42,.12);
}

.nav-toggle:checked ~ .site-nav {
    display: flex;
}

.site-nav a {
    color: #475467;
    font-size: 15px;
    font-weight: 600;
    padding: 10px 12px;
    border-radius: 12px;
}

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

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 28px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    letter-spacing: .02em;
    box-shadow: 0 14px 28px rgba(41,128,254,.25);
    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,.28);
}

.text-link {
    color: var(--blue);
    font-weight: 700;
}

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

.badge,
.category-badge,
.mini-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    width: fit-content;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--blue);
    background: #edf5ff;
    border: 1px solid #d7e8ff;
    font-size: 13px;
    font-weight: 800;
}

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

.vpn-network-hero::before,
.vpn-network-hero::after {
    content: "";
    position: absolute;
    inset: auto;
    border-radius: 999px;
    filter: blur(8px);
    opacity: .28;
    background: rgba(255,255,255,.9);
}

.vpn-network-hero::before {
    width: 320px;
    height: 320px;
    top: -140px;
    right: -80px;
}

.vpn-network-hero::after {
    width: 220px;
    height: 220px;
    left: -70px;
    bottom: -90px;
}

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

.hero-copy h1 {
    margin: 18px 0 18px;
    font-size: clamp(34px, 9vw, 64px);
    line-height: 1.08;
    letter-spacing: -.04em;
}

.hero-copy p {
    color: rgba(255,255,255,.88);
    font-size: 17px;
    max-width: 660px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 22px 0 28px;
}

.hero-tags span {
    padding: 8px 12px;
    border: 1px solid rgba(255,255,255,.3);
    border-radius: 999px;
    color: rgba(255,255,255,.92);
    background: rgba(255,255,255,.12);
}

.hero-visual {
    position: relative;
    min-height: 320px;
    padding: 18px;
}

.network-lines {
    position: absolute;
    inset: 0;
    border-radius: 34px;
    opacity: .55;
    background:
        radial-gradient(circle at 20% 20%, rgba(255,255,255,.9) 0 3px, transparent 4px),
        radial-gradient(circle at 78% 22%, rgba(255,255,255,.9) 0 3px, transparent 4px),
        radial-gradient(circle at 68% 74%, rgba(255,255,255,.9) 0 3px, transparent 4px),
        radial-gradient(circle at 24% 70%, rgba(255,255,255,.9) 0 3px, transparent 4px),
        linear-gradient(135deg, rgba(255,255,255,.28), rgba(255,255,255,.06));
    border: 1px solid rgba(255,255,255,.22);
}

.network-lines::before {
    content: "";
    position: absolute;
    inset: 28px;
    background:
        linear-gradient(32deg, transparent 48%, rgba(255,255,255,.35) 49%, rgba(255,255,255,.35) 51%, transparent 52%),
        linear-gradient(145deg, transparent 49%, rgba(255,255,255,.22) 50%, transparent 51%);
}

.hero-device {
    position: relative;
    z-index: 1;
    width: min(420px, 92%);
    margin: 26px auto 0;
    border-radius: 30px;
    box-shadow: 0 32px 90px rgba(17,24,39,.28);
}

.status-pill {
    position: absolute;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 12px;
    border-radius: 999px;
    color: #1f2937;
    background: rgba(255,255,255,.92);
    box-shadow: 0 12px 30px rgba(17,24,39,.14);
    font-size: 13px;
    font-weight: 800;
}

.status-pill::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--blue);
}

.pill-one { top: 28px; left: 8px; }
.pill-two { top: 78px; right: 0; }
.pill-three { bottom: 80px; left: 0; }
.pill-four { bottom: 24px; right: 20px; }

.section {
    padding: 68px 0;
}

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

.section-heading {
    max-width: 760px;
    margin-bottom: 28px;
}

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

.section-heading h2,
.page-title h1,
.article-main h1 {
    margin: 10px 0 14px;
    color: var(--deep);
    line-height: 1.18;
    letter-spacing: -.03em;
}

.section-heading h2 {
    font-size: clamp(28px, 5vw, 42px);
}

.section-heading p,
.page-title p,
.article-main p,
.card p,
.feature-card p,
.risk-card p,
.faq-item p {
    color: var(--muted);
}

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

.node-card,
.card,
.feature-card,
.risk-card,
.faq-item,
.step-card,
.side-panel,
.info-panel,
.download-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    box-shadow: 0 14px 38px rgba(15,23,42,.06);
}

.node-card {
    padding: 22px;
}

.node-card .tag {
    display: inline-block;
    margin-bottom: 10px;
    color: var(--blue);
    font-size: 12px;
    font-weight: 900;
    letter-spacing: .06em;
}

.node-card h3,
.feature-card h3,
.risk-card h3,
.step-card h3,
.card h3,
.info-panel h3 {
    margin: 0 0 9px;
    color: var(--deep);
}

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

.visual-card {
    position: relative;
    overflow: hidden;
    border-radius: 32px;
    padding: 22px;
    background: linear-gradient(145deg, #f7faff, #eef3ff);
    border: 1px solid #dde8ff;
}

.visual-card img {
    margin: 0 auto;
    border-radius: 26px;
}

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

.point-list li,
.clean-list li {
    position: relative;
    padding-left: 28px;
    color: #475467;
}

.point-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .72em;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 5px rgba(41,128,254,.12);
}

.global-nodes-section {
    position: relative;
    overflow: hidden;
    border-radius: 34px;
    padding: 28px;
    background:
        radial-gradient(circle at 18% 20%, rgba(41,128,254,.18) 0 4px, transparent 5px),
        radial-gradient(circle at 74% 36%, rgba(123,78,241,.18) 0 4px, transparent 5px),
        radial-gradient(circle at 62% 78%, rgba(184,77,218,.15) 0 4px, transparent 5px),
        linear-gradient(135deg, #ffffff, #f1f6ff);
    border: 1px solid #dfe8f7;
}

.global-inner {
    display: grid;
    gap: 26px;
    align-items: center;
}

.node-panel {
    display: grid;
    gap: 12px;
}

.node-panel .node-line {
    padding: 14px 16px;
    border-radius: 18px;
    background: rgba(255,255,255,.78);
    border: 1px solid rgba(220,228,240,.9);
}

.speed-grid,
.no-log-grid,
.risk-grid,
.faq-grid,
.feature-grid,
.guide-grid,
.related-grid {
    display: grid;
    gap: 16px;
}

.speed-card,
.feature-card,
.card,
.risk-card,
.faq-item,
.step-card {
    padding: 22px;
}

.speed-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
}

.speed-meter {
    height: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: #e7edf7;
    margin: 14px 0 8px;
}

.speed-meter span {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: var(--blue);
}

.privacy-panel {
    padding: 26px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 30px;
    box-shadow: 0 18px 45px rgba(15,23,42,.08);
}

.privacy-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.privacy-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: #f2f6fb;
    color: #344054;
    font-size: 13px;
    font-weight: 700;
}

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

.device-cards {
    display: grid;
    gap: 14px;
}

.device-card {
    padding: 18px;
    border-radius: 22px;
    background: #fff;
    border: 1px solid var(--line);
}

.tech-panel {
    padding: 24px;
    border-radius: 30px;
    background: #101828;
    color: #fff;
}

.tech-panel p {
    color: rgba(255,255,255,.75);
}

.protocol-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 13px 0;
    border-bottom: 1px solid rgba(255,255,255,.12);
}

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

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

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

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

.risk-card .suggestion {
    display: block;
    margin-top: 8px;
    color: #344054;
    font-weight: 700;
}

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

.cta-section {
    padding: 58px 0;
    color: #fff;
    background: var(--gradient);
}

.cta-box {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
}

.cta-box h2 {
    margin: 0 0 14px;
    font-size: clamp(28px, 6vw, 44px);
    line-height: 1.2;
}

.cta-box p {
    color: rgba(255,255,255,.86);
    margin-bottom: 24px;
}

.page-hero {
    padding: 52px 0 42px;
    background: linear-gradient(180deg, #f7faff 0%, #ffffff 100%);
}

.page-title {
    max-width: 840px;
}

.page-title h1 {
    font-size: clamp(32px, 7vw, 52px);
}

.page-layout {
    display: grid;
    gap: 28px;
    align-items: start;
}

.article-main {
    max-width: 780px;
}

.article-card {
    padding: 24px;
    margin-bottom: 18px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 26px;
}

.article-card h2 {
    margin-top: 0;
    color: var(--deep);
}

.side-panel {
    padding: 22px;
}

.side-panel h3 {
    margin-top: 0;
}

.side-panel a {
    display: block;
    padding: 10px 0;
    color: var(--blue);
    font-weight: 700;
    border-bottom: 1px solid var(--line);
}

.notice-box {
    padding: 18px;
    border-radius: 22px;
    background: #f7fbff;
    border: 1px solid #dcecff;
    color: #475467;
}

.download-panel {
    padding: 28px;
    text-align: center;
    background: linear-gradient(180deg, #fff, #f7faff);
}

.steps-list {
    display: grid;
    gap: 12px;
    margin: 22px 0;
    padding: 0;
    list-style: none;
    counter-reset: item;
}

.steps-list li {
    counter-increment: item;
    padding: 16px 16px 16px 56px;
    position: relative;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    color: #475467;
}

.steps-list li::before {
    content: counter(item);
    position: absolute;
    left: 16px;
    top: 15px;
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
}

.site-footer {
    padding: 50px 0 26px;
    background: #111827;
    color: rgba(255,255,255,.78);
}

.footer-grid {
    display: grid;
    gap: 28px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    color: #fff;
}

.footer-logo {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    object-fit: cover;
}

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

.site-footer a {
    display: block;
    color: rgba(255,255,255,.72);
    padding: 5px 0;
}

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

.footer-bottom {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,.12);
    font-size: 14px;
}

@media (min-width: 700px) {
    .node-overview,
    .no-log-grid,
    .feature-grid,
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

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

    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
    }
}

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

    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }

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

    .hero-grid,
    .split-section,
    .vpn-connection-section,
    .high-speed-section,
    .multi-device-section,
    .encryption-protocol-section,
    .privacy-protection-section,
    .global-inner,
    .page-layout {
        grid-template-columns: 1.05fr .95fr;
    }

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

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

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

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

    .speed-grid {
        grid-template-columns: 1fr 1fr;
    }

    .section {
        padding: 88px 0;
    }

    .vpn-network-hero {
        padding: 82px 0 96px;
    }
}

@media (max-width: 420px) {
    .container {
        width: min(100% - 24px, 1120px);
    }

    .download-btn {
        width: 100%;
        padding-left: 18px;
        padding-right: 18px;
    }

    .status-pill {
        position: static;
        margin: 8px 6px 0 0;
    }

    .hero-visual {
        min-height: auto;
        display: flex;
        flex-wrap: wrap;
        align-items: center;
    }

    .hero-device {
        order: -1;
        width: 100%;
        margin-top: 12px;
    }
}