* {
    box-sizing: border-box;
}

:root {
    --primary: #2980FE;
    --primary-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --line: #e5eaf2;
    --white: #ffffff;
    --shadow: 0 18px 48px rgba(38, 55, 112, 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;
}

.narrow {
    max-width: 860px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid rgba(229, 234, 242, 0.9);
    backdrop-filter: blur(18px);
}

.header-inner {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo,
.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: 0.02em;
    color: #15213d;
}

.site-logo img,
.footer-logo img {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    object-fit: cover;
}

.main-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    display: none;
    padding: 12px 16px 18px;
    background: #ffffff;
    border-bottom: 1px solid var(--line);
}

.main-nav a {
    display: block;
    padding: 11px 12px;
    color: #344054;
    font-size: 15px;
    border-radius: 12px;
}

.main-nav a.active,
.main-nav a:hover {
    color: var(--primary);
    background: #eef5ff;
}

.nav-download {
    color: var(--primary) !important;
    font-weight: 700;
}

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

.nav-toggle-label {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: grid;
    place-items: center;
    cursor: pointer;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
    display: block;
    width: 20px;
    height: 2px;
    background: #1f2937;
    border-radius: 8px;
    content: "";
    position: relative;
}

.nav-toggle-label span::before {
    position: absolute;
    top: -7px;
}

.nav-toggle-label span::after {
    position: absolute;
    top: 7px;
}

.nav-toggle:checked ~ .main-nav {
    display: block;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: #2980FE;
    color: #ffffff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(41, 128, 254, 0.25);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(23, 104, 232, 0.28);
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-weight: 800;
    margin-top: 10px;
}

.text-link::after {
    content: "→";
}

.center-link {
    display: flex;
    justify-content: center;
    width: max-content;
    margin: 26px auto 0;
}

.vpn-network-hero {
    position: relative;
    color: #ffffff;
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    overflow: hidden;
}

.hero-mesh {
    position: absolute;
    inset: 0;
    opacity: 0.25;
    background:
        radial-gradient(circle at 18% 26%, rgba(255,255,255,0.55) 0 2px, transparent 3px),
        radial-gradient(circle at 70% 18%, rgba(255,255,255,0.5) 0 2px, transparent 3px),
        radial-gradient(circle at 84% 68%, rgba(255,255,255,0.5) 0 2px, transparent 3px),
        linear-gradient(135deg, transparent 0 30%, rgba(255,255,255,0.22) 31%, transparent 32% 100%),
        linear-gradient(45deg, transparent 0 48%, rgba(255,255,255,0.2) 49%, transparent 50% 100%);
    background-size: 180px 180px, 220px 220px, 260px 260px, 100% 100%, 100% 100%;
}

.hero-grid {
    position: relative;
    padding: 72px 0 78px;
    display: grid;
    gap: 38px;
    align-items: center;
}

.eyebrow,
.section-label,
.page-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 7px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 800;
    color: #125fd0;
    background: #e9f2ff;
}

.eyebrow {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.section-label.light {
    background: rgba(255,255,255,0.18);
    color: #ffffff;
    border: 1px solid rgba(255,255,255,0.24);
}

.hero-copy h1 {
    margin: 18px 0 18px;
    font-size: clamp(34px, 8vw, 62px);
    line-height: 1.08;
    letter-spacing: -0.05em;
}

.hero-copy p {
    margin: 0 0 24px;
    max-width: 640px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 17px;
}

.hero-tags,
.badge-row,
.device-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.hero-tags span,
.badge-row span,
.device-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    border: 1px solid rgba(255,255,255,0.22);
    font-size: 13px;
    color: #ffffff;
}

.hero-visual {
    position: relative;
    min-height: 320px;
    display: grid;
    place-items: center;
}

.hero-visual img {
    width: min(460px, 92%);
    border-radius: 32px;
    box-shadow: 0 30px 80px rgba(20, 25, 80, 0.3);
}

.float-card {
    position: absolute;
    padding: 11px 15px;
    background: rgba(255,255,255,0.92);
    color: #1f2937;
    border-radius: 16px;
    font-weight: 800;
    font-size: 13px;
    box-shadow: 0 16px 34px rgba(24, 32, 78, 0.18);
}

.card-a { top: 16px; left: 12px; }
.card-b { top: 48px; right: 18px; }
.card-c { bottom: 60px; left: 0; }
.card-d { bottom: 24px; right: 28px; }

.section {
    padding: 72px 0;
}

.section:nth-of-type(odd) {
    background: #ffffff;
}

.section:nth-of-type(even) {
    background: #f7f9fd;
}

.section-heading {
    max-width: 760px;
    margin: 0 auto 34px;
    text-align: center;
}

.section-heading h2,
.content-panel h2,
.privacy-copy h2,
.protocol-copy h2,
.nodes-copy h2 {
    margin: 14px 0 12px;
    font-size: clamp(26px, 5vw, 42px);
    line-height: 1.2;
    letter-spacing: -0.03em;
}

.section-heading p,
.content-panel p,
.privacy-copy p,
.protocol-copy p,
.nodes-copy p {
    color: var(--muted);
    margin: 0;
}

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

.node-card,
.policy-grid article,
.info-grid article,
.faq-item,
.risk-grid article,
.content-card,
.side-panel,
.notice-box {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 10px 26px rgba(38, 55, 112, 0.06);
}

.node-card span,
.process-steps span {
    display: inline-flex;
    width: 38px;
    height: 38px;
    border-radius: 14px;
    align-items: center;
    justify-content: center;
    background: #eef5ff;
    color: var(--primary);
    font-weight: 900;
}

.node-card h3,
.policy-grid h3,
.info-grid h3,
.risk-grid h3,
.faq-item h2,
.faq-item h3 {
    margin: 14px 0 8px;
    color: #172033;
}

.node-card p,
.policy-grid p,
.info-grid p,
.risk-grid p,
.faq-item p,
.side-panel p,
.notice-box p {
    color: var(--muted);
    margin: 0;
}

.node-card a,
.process-steps a,
.risk-grid a,
.side-links a {
    display: inline-flex;
    margin-top: 14px;
    color: var(--primary);
    font-weight: 800;
}

.split-section,
.nodes-layout,
.speed-layout,
.privacy-layout,
.protocol-layout,
.page-hero-grid,
.content-two,
.article-layout {
    display: grid;
    gap: 28px;
    align-items: center;
}

.image-panel,
.map-panel,
.privacy-card,
.device-panel,
.protocol-panel,
.page-hero-image {
    position: relative;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 32px;
    padding: 18px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.image-panel img,
.map-panel img,
.privacy-card img,
.device-panel img,
.protocol-panel img,
.page-hero-image img {
    width: 100%;
    border-radius: 24px;
    object-fit: cover;
}

.feature-list,
.check-list,
.ordered-list {
    padding-left: 20px;
    color: #344054;
}

.feature-list li,
.check-list li,
.ordered-list li {
    margin: 8px 0;
}

.global-nodes-section {
    background:
        radial-gradient(circle at 20% 20%, rgba(41,128,254,0.12), transparent 30%),
        radial-gradient(circle at 80% 70%, rgba(123,78,241,0.12), transparent 34%),
        #ffffff;
}

.mini-grid {
    display: grid;
    gap: 12px;
    margin: 22px 0 0;
}

.mini-grid div {
    padding: 16px;
    border-radius: 18px;
    background: #ffffff;
    border: 1px solid var(--line);
}

.mini-grid strong,
.mini-grid span {
    display: block;
}

.mini-grid span {
    color: var(--muted);
    margin-top: 4px;
    font-size: 14px;
}

.map-dot {
    position: absolute;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 8px rgba(41,128,254,0.16);
}

.dot-one { top: 24%; left: 28%; }
.dot-two { top: 46%; left: 62%; }
.dot-three { top: 68%; left: 42%; }

.high-speed-section {
    background: #f4f8ff;
}

.speed-lines {
    display: grid;
    gap: 14px;
    margin-top: 22px;
}

.speed-lines div {
    display: grid;
    grid-template-columns: 92px 1fr;
    gap: 12px;
    align-items: center;
    color: #344054;
    font-weight: 700;
}

.speed-lines i {
    height: 10px;
    border-radius: 99px;
    background: linear-gradient(90deg, #d5e7ff, #2980FE);
}

.privacy-protection-section {
    background: #ffffff;
}

.privacy-card {
    background: linear-gradient(180deg, #ffffff, #f3f7ff);
}

.privacy-card .badge-row span {
    background: #eef5ff;
    border-color: #dbe9ff;
    color: #1f4f9f;
}

.policy-grid article {
    border-top: 4px solid #2980FE;
}

.device-panel {
    background: linear-gradient(180deg, #ffffff, #f6f3ff);
}

.device-tags span {
    background: #eef5ff;
    color: #125fd0;
    border-color: #dbe9ff;
}

.protocol-panel {
    background: #f8fbff;
}

.protocol-stack {
    display: grid;
    gap: 10px;
    margin-top: 16px;
}

.protocol-stack span {
    padding: 13px 16px;
    border-radius: 16px;
    background: #ffffff;
    border: 1px solid var(--line);
    color: #344054;
    font-weight: 800;
}

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

.process-steps article {
    position: relative;
    padding: 22px;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 22px;
}

.process-steps h3 {
    margin: 14px 0 8px;
}

.process-steps p {
    margin: 0;
    color: var(--muted);
}

.risk-grid article {
    border-left: 4px solid #2980FE;
}

.risk-grid strong {
    display: block;
    margin-top: 12px;
    color: #344054;
}

.cta-section {
    padding: 72px 0;
    background: #ffffff;
}

.cta-card {
    text-align: center;
    color: #ffffff;
    padding: 52px 22px;
    border-radius: 32px;
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    position: relative;
    overflow: hidden;
}

.cta-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 20%, rgba(255,255,255,0.24), transparent 28%),
        radial-gradient(circle at 80% 65%, rgba(255,255,255,0.18), transparent 30%);
}

.cta-card > * {
    position: relative;
}

.cta-card h2 {
    margin: 14px auto 10px;
    max-width: 760px;
    font-size: clamp(26px, 5vw, 42px);
    line-height: 1.2;
}

.cta-card p {
    margin: 0 auto 24px;
    max-width: 700px;
    color: rgba(255,255,255,0.88);
}

.page-hero {
    padding: 64px 0;
    background:
        radial-gradient(circle at 15% 20%, rgba(41,128,254,0.12), transparent 28%),
        radial-gradient(circle at 88% 24%, rgba(184,77,218,0.12), transparent 32%),
        #f7f9fd;
}

.simple-hero {
    text-align: center;
}

.page-hero h1 {
    margin: 16px 0 12px;
    font-size: clamp(34px, 7vw, 54px);
    line-height: 1.12;
    letter-spacing: -0.04em;
}

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

.simple-hero .download-btn {
    margin-top: 24px;
}

.article-layout {
    align-items: start;
}

.article-main {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: 0 10px 26px rgba(38, 55, 112, 0.06);
}

.article-main h2 {
    margin: 0 0 10px;
    color: #172033;
}

.article-main h2:not(:first-child) {
    margin-top: 28px;
}

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

.article-main .download-btn {
    margin-top: 20px;
}

.side-panel h2,
.content-card h2,
.notice-box h2 {
    margin: 0 0 12px;
}

.side-links {
    display: grid;
    gap: 10px;
    margin-top: 14px;
}

.side-links a {
    padding: 12px 14px;
    background: #f3f7ff;
    border-radius: 14px;
}

.notice-box {
    background: #f8fbff;
    margin-top: 22px;
}

.content-two {
    align-items: start;
}

.single-action {
    text-align: center;
    margin-top: 28px;
}

.site-footer {
    background: #101828;
    color: #d0d5dd;
    padding-top: 56px;
}

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

.footer-logo {
    color: #ffffff;
    margin-bottom: 12px;
}

.footer-brand p {
    color: #98a2b3;
    max-width: 360px;
}

.site-footer h3 {
    margin: 0 0 14px;
    color: #ffffff;
    font-size: 16px;
}

.site-footer a {
    display: block;
    color: #d0d5dd;
    margin: 8px 0;
}

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

.footer-bottom {
    margin-top: 38px;
    border-top: 1px solid rgba(255,255,255,0.12);
    text-align: center;
    padding: 20px;
    color: #98a2b3;
}

@media (min-width: 640px) {
    .node-card-grid,
    .policy-grid,
    .info-grid,
    .faq-list.compact {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

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

@media (min-width: 900px) {
    .nav-toggle-label {
        display: none;
    }

    .main-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0;
        background: transparent;
        border: 0;
    }

    .main-nav a {
        display: inline-flex;
        padding: 9px 12px;
    }

    .hero-grid,
    .split-section,
    .nodes-layout,
    .speed-layout,
    .privacy-layout,
    .protocol-layout,
    .page-hero-grid,
    .content-two {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

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

    .article-layout.alt-b .article-main {
        order: 2;
    }

    .article-layout.alt-b .side-panel {
        order: 1;
    }

    .article-layout.alt-c .article-main {
        background: linear-gradient(180deg, #ffffff, #f8fbff);
    }

    .article-layout.alt-d .side-panel {
        border-top: 4px solid #2980FE;
    }

    .reverse .content-panel {
        order: 2;
    }

    .reverse .device-panel {
        order: 1;
    }

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

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

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

    .footer-grid {
        grid-template-columns: 1.6fr 1fr 1fr 1fr;
    }

    .sticky-panel {
        position: sticky;
        top: 92px;
    }

    .hero-grid {
        padding: 92px 0 100px;
    }

    .section {
        padding: 88px 0;
    }
}

@media (max-width: 520px) {
    .container {
        width: min(100% - 24px, 1120px);
    }

    .download-btn {
        width: 100%;
        min-height: 52px;
    }

    .hero-tags span,
    .badge-row span,
    .device-tags span {
        flex: 1 1 auto;
        text-align: center;
    }

    .float-card {
        font-size: 12px;
        padding: 9px 12px;
    }

    .card-a { top: 0; left: 0; }
    .card-b { top: 22px; right: 0; }
    .card-c { bottom: 42px; left: 0; }
    .card-d { bottom: 0; right: 0; }

    .node-card,
    .policy-grid article,
    .info-grid article,
    .faq-item,
    .risk-grid article,
    .content-card,
    .side-panel,
    .notice-box,
    .article-main {
        padding: 20px;
        border-radius: 20px;
    }

    .page-hero,
    .section,
    .cta-section {
        padding: 52px 0;
    }
}