* {
    box-sizing: border-box;
}
:root {
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f6f8fc;
    --line: #e5eaf3;
    --deep: #111827;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --radius: 24px;
    --shadow: 0 18px 50px rgba(31, 41, 55, 0.08);
}
html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #ffffff;
    line-height: 1.7;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    display: block;
}
.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}
.narrow-container {
    width: min(860px, calc(100% - 32px));
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
}
.header-inner {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--deep);
    font-size: 20px;
}
.logo-img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}
.site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    padding: 14px 16px 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
}
.site-nav a {
    display: block;
    padding: 12px 8px;
    color: #344054;
    font-size: 15px;
    border-radius: 12px;
}
.site-nav a:hover {
    color: var(--blue);
    background: #f3f7ff;
}
.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}
.nav-toggle-label {
    display: inline-flex;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 14px;
    cursor: pointer;
}
.nav-toggle-label span {
    width: 22px;
    height: 2px;
    background: var(--deep);
    border-radius: 99px;
}
.nav-toggle:checked ~ .site-nav {
    display: block;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 700;
    box-shadow: 0 12px 26px rgba(41, 128, 254, 0.24);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover {
    background: var(--blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 16px 30px rgba(23, 104, 232, 0.28);
}
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    background: var(--gradient);
    color: #fff;
    padding: 72px 0 52px;
}
.hero-pattern {
    position: absolute;
    inset: 0;
    opacity: .26;
    background-image:
        radial-gradient(circle at 18% 26%, rgba(255,255,255,.5) 0 2px, transparent 3px),
        radial-gradient(circle at 72% 30%, rgba(255,255,255,.45) 0 2px, transparent 3px),
        radial-gradient(circle at 58% 72%, rgba(255,255,255,.35) 0 2px, transparent 3px),
        linear-gradient(115deg, transparent 0 20%, rgba(255,255,255,.25) 21%, transparent 22% 100%),
        linear-gradient(35deg, transparent 0 40%, rgba(255,255,255,.18) 41%, transparent 42% 100%);
}
.hero-grid {
    position: relative;
    display: grid;
    gap: 38px;
    align-items: center;
}
.eyebrow,
.section-kicker,
.page-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, .1);
    color: var(--blue);
    font-size: 13px;
    font-weight: 700;
}
.hero-copy .eyebrow {
    background: rgba(255,255,255,.16);
    color: #fff;
}
.hero-copy h1 {
    margin: 18px 0 18px;
    font-size: clamp(34px, 10vw, 60px);
    line-height: 1.08;
    letter-spacing: -1px;
}
.hero-copy p {
    margin: 0 0 28px;
    color: rgba(255,255,255,.88);
    font-size: 17px;
}
.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}
.hero-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
    font-size: 13px;
}
.hero-visual {
    position: relative;
    min-height: 340px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.hero-img {
    width: min(480px, 88vw);
    border-radius: 32px;
    box-shadow: 0 30px 90px rgba(0,0,0,.22);
}
.float-card {
    position: absolute;
    padding: 10px 14px;
    background: rgba(255,255,255,.9);
    color: #1f2937;
    border-radius: 16px;
    font-size: 13px;
    font-weight: 800;
    box-shadow: 0 16px 34px rgba(15,23,42,.16);
}
.card-a { left: 3%; top: 10%; }
.card-b { right: 0; top: 18%; }
.card-c { left: 8%; bottom: 14%; }
.card-d { right: 5%; bottom: 8%; }
.feature-section,
.node-overview-section,
.content-section {
    padding: 68px 0;
}
.section-heading {
    margin-bottom: 32px;
}
.section-heading.centered {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}
h2 {
    margin: 12px 0 12px;
    font-size: clamp(26px, 5vw, 40px);
    line-height: 1.2;
    color: var(--deep);
}
h3 {
    color: var(--deep);
}
.section-heading p,
.feature-copy p,
.main-article p,
.info-card p,
.faq-item p {
    color: var(--muted);
}
.node-overview {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.node-card,
.info-card,
.faq-item,
.side-panel,
.main-article,
.policy-grid article,
.process-steps article,
.risk-grid article,
.article-summary,
.notice-box,
.mini-card-grid article {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.node-card {
    padding: 24px;
}
.node-label {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    background: #eef5ff;
    color: var(--blue);
    font-size: 12px;
    font-weight: 800;
}
.node-card h3 {
    margin: 14px 0 8px;
}
.node-card p {
    margin: 0 0 18px;
    color: var(--muted);
}
.node-card a,
.text-link,
.policy-grid a,
.process-steps a,
.risk-grid a,
.side-panel a {
    color: var(--blue);
    font-weight: 700;
}
.split-grid,
.privacy-layout,
.protocol-layout,
.speed-layout,
.content-grid,
.two-column {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
    align-items: center;
}
.image-panel,
.security-panel,
.protocol-card {
    position: relative;
    padding: 18px;
    border-radius: 32px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.image-panel img,
.security-panel img,
.protocol-card img {
    border-radius: 24px;
    width: 100%;
    object-fit: cover;
}
.feature-copy .check-list,
.check-list {
    padding: 0;
    list-style: none;
    margin: 18px 0;
}
.check-list li {
    position: relative;
    padding-left: 28px;
    margin: 10px 0;
    color: #4b5563;
}
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 9px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 5px #eaf2ff;
}
.gradient-soft {
    background: linear-gradient(180deg, #f8fbff 0%, #fff 100%);
}
.pale-section {
    background: #f6f8fc;
}
.node-map-card {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    margin: 22px 0;
    padding: 20px;
    border-radius: 22px;
    background: #fff;
    border: 1px solid var(--line);
}
.node-map-card span {
    color: var(--muted);
    font-size: 13px;
}
.speed-cards,
.device-list,
.privacy-tags,
.protocol-lines {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 22px 0;
}
.speed-cards div {
    flex: 1 1 150px;
    padding: 16px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--line);
}
.speed-cards b,
.speed-cards span {
    display: block;
}
.speed-cards span {
    color: var(--muted);
    font-size: 14px;
}
.device-list span,
.privacy-tags span,
.protocol-lines span {
    padding: 9px 13px;
    border-radius: 999px;
    background: #eef5ff;
    color: var(--blue);
    font-weight: 700;
    font-size: 13px;
}
.security-panel .panel-note {
    margin-top: 14px;
    padding: 16px;
    border-radius: 18px;
    background: #f7f9fd;
    color: var(--muted);
}
.policy-grid,
.process-steps,
.risk-grid,
.mini-card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.policy-grid article,
.process-steps article,
.risk-grid article,
.mini-card-grid article {
    padding: 22px;
}
.process-steps b {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: var(--blue);
    color: #fff;
}
.risk-grid article {
    border-left: 4px solid var(--blue);
}
.risk-grid strong,
.risk-grid span {
    display: block;
}
.risk-grid span {
    color: var(--muted);
    margin-bottom: 10px;
}
.faq-list {
    display: grid;
    gap: 14px;
}
.faq-item {
    padding: 22px;
    box-shadow: none;
}
.faq-item h2,
.faq-item h3 {
    margin: 0 0 8px;
    font-size: 20px;
}
.center-action {
    text-align: center;
    margin-top: 26px;
}
.cta-section {
    padding: 72px 0;
    background: var(--gradient);
    color: #fff;
    text-align: center;
}
.cta-inner {
    width: min(780px, calc(100% - 32px));
}
.cta-section h2 {
    color: #fff;
}
.cta-section p {
    color: rgba(255,255,255,.86);
    margin-bottom: 26px;
}
.page-hero {
    padding: 68px 0 46px;
    background: linear-gradient(180deg, #f7f9ff 0%, #ffffff 100%);
    text-align: center;
}
.page-hero h1 {
    margin: 16px 0 14px;
    font-size: clamp(32px, 8vw, 52px);
    color: var(--deep);
    line-height: 1.16;
}
.page-hero p {
    color: var(--muted);
    margin: 0 auto;
    max-width: 760px;
}
.content-grid {
    align-items: start;
}
.main-article {
    padding: 24px;
}
.main-article h2 {
    font-size: 26px;
    margin-top: 28px;
}
.main-article .download-btn,
.page-hero .download-btn {
    margin-top: 24px;
}
.article-summary {
    padding: 18px;
    background: #f8fbff;
    color: #344054;
    font-weight: 700;
    border-color: #dbe8ff;
    box-shadow: none;
}
.article-cards {
    margin-top: 28px;
}
.notice-box {
    margin: 24px 0;
    padding: 18px;
    background: #f9fafb;
    box-shadow: none;
}
.notice-box p {
    margin: 8px 0 0;
}
.side-panel {
    padding: 22px;
    box-shadow: none;
    position: sticky;
    top: 96px;
}
.side-panel h3 {
    margin-top: 0;
}
.side-panel a {
    display: block;
    padding: 11px 0;
    border-bottom: 1px solid var(--line);
}
.info-card {
    padding: 24px;
}
.step-list {
    padding: 0;
    list-style: none;
    counter-reset: item;
}
.step-list li {
    position: relative;
    padding: 14px 0 14px 54px;
    border-bottom: 1px solid var(--line);
}
.step-list li::before {
    counter-increment: item;
    content: counter(item);
    position: absolute;
    left: 0;
    top: 14px;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    background: var(--blue);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 800;
}
.step-list strong,
.step-list span {
    display: block;
}
.step-list span {
    color: var(--muted);
}
.site-footer {
    background: #101828;
    color: #d0d5dd;
    padding: 54px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}
.footer-brand {
    color: #fff;
    font-size: 24px;
    font-weight: 800;
}
.site-footer h3 {
    color: #fff;
    margin: 0 0 12px;
}
.site-footer a {
    display: block;
    color: #d0d5dd;
    padding: 5px 0;
}
.site-footer a:hover {
    color: #fff;
}
.footer-bottom {
    margin-top: 34px;
    padding: 20px 16px;
    border-top: 1px solid rgba(255,255,255,.08);
    text-align: center;
    color: #98a2b3;
    font-size: 14px;
}
@media (min-width: 640px) {
    .node-overview,
    .policy-grid,
    .mini-card-grid,
    .risk-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 920px) {
    .nav-toggle-label {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .site-nav a {
        padding: 8px 10px;
        font-size: 14px;
    }
    .hero-grid {
        grid-template-columns: 1.02fr .98fr;
    }
    .vpn-network-hero {
        padding: 96px 0 82px;
    }
    .split-grid,
    .privacy-layout,
    .protocol-layout,
    .speed-layout,
    .two-column {
        grid-template-columns: 1fr 1fr;
    }
    .content-grid {
        grid-template-columns: minmax(0, 1fr) 280px;
    }
    .reversed .feature-copy {
        order: 2;
    }
    .reversed .image-panel {
        order: 1;
    }
    .node-overview {
        grid-template-columns: repeat(4, 1fr);
    }
    .policy-grid,
    .risk-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1.4fr .8fr .8fr .8fr;
    }
    .main-article {
        padding: 34px;
    }
}
@media (min-width: 1100px) {
    .process-steps {
        grid-template-columns: repeat(3, 1fr);
    }
    .hero-copy p {
        max-width: 620px;
    }
}