:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --lighter: #f8fbff;
    --border: #e5eaf3;
    --card: #ffffff;
    --shadow: 0 16px 45px rgba(35, 58, 135, .10);
    --radius: 24px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--text);
    background: #ffffff;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 16px; color: var(--muted); }
h1, h2, h3 { margin: 0 0 16px; line-height: 1.25; color: #111827; }
h1 { font-size: clamp(34px, 8vw, 62px); letter-spacing: -1px; }
h2 { font-size: clamp(26px, 5vw, 42px); }
h3 { font-size: 20px; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.section { padding: 64px 0; }
.section-soft { background: var(--lighter); }
.section-head { max-width: 760px; margin-bottom: 28px; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 30px;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, .10);
    color: var(--blue);
    font-weight: 700;
    font-size: 13px;
    margin-bottom: 14px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 26px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(41, 128, 254, .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 16px 34px rgba(23, 104, 232, .32); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}
.header-inner {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; color: #101828; font-size: 19px; }
.logo img { width: 42px; height: 42px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 18px rgba(53,88,242,.18); }
.nav-toggle { display: none; }
.nav-toggle-label { width: 42px; height: 42px; display: grid; place-content: center; gap: 5px; border: 1px solid var(--border); border-radius: 13px; cursor: pointer; }
.nav-toggle-label span { width: 20px; height: 2px; background: #263043; display: block; border-radius: 5px; }
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 78px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.site-nav a { padding: 10px 12px; color: #344054; border-radius: 12px; font-weight: 700; font-size: 14px; }
.site-nav a:hover, .site-nav a.active { background: rgba(41,128,254,.10); color: var(--blue); }
.nav-toggle:checked ~ .site-nav { display: flex; }
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    background: var(--gradient);
    color: #fff;
    padding: 72px 0 54px;
}
.vpn-network-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 18% 30%, rgba(255,255,255,.24), transparent 18%),
        radial-gradient(circle at 82% 18%, rgba(255,255,255,.18), transparent 16%),
        linear-gradient(115deg, transparent 0 20%, rgba(255,255,255,.12) 20% 21%, transparent 21% 49%, rgba(255,255,255,.12) 49% 50%, transparent 50%);
    opacity: .9;
}
.hero-grid { position: relative; display: grid; gap: 34px; align-items: center; }
.hero-content h1, .hero-content p { color: #fff; }
.hero-content p { font-size: 18px; max-width: 680px; opacity: .92; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 28px; }
.hero-tags span { border: 1px solid rgba(255,255,255,.35); background: rgba(255,255,255,.16); padding: 8px 12px; border-radius: 999px; color: #fff; font-weight: 700; font-size: 14px; }
.hero-visual { position: relative; min-height: 310px; display: grid; place-items: center; }
.hero-visual .product-img { width: min(420px, 90%); border-radius: 34px; box-shadow: 0 30px 80px rgba(14, 20, 66, .32); }
.floating-card {
    position: absolute;
    padding: 10px 14px;
    border-radius: 16px;
    background: rgba(255,255,255,.92);
    color: #263043;
    font-weight: 800;
    box-shadow: 0 14px 38px rgba(10, 16, 50, .16);
    border: 1px solid rgba(255,255,255,.65);
    font-size: 13px;
}
.float-one { left: 2%; top: 12%; }
.float-two { right: 4%; top: 24%; }
.float-three { left: 4%; bottom: 18%; }
.float-four { right: 1%; bottom: 10%; }
.node-overview { margin-top: -28px; position: relative; z-index: 3; }
.node-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.node-card, .service-card, .risk-card, .faq-item, .info-card, .step-card, .content-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(31, 41, 55, .05);
}
.node-card { padding: 22px; }
.node-label { display: inline-flex; padding: 4px 10px; border-radius: 999px; background: rgba(41,128,254,.10); color: var(--blue); font-weight: 800; font-size: 12px; margin-bottom: 12px; }
.text-link { color: var(--blue); font-weight: 800; }
.text-link:hover { color: var(--blue-dark); }
.split-section { display: grid; gap: 30px; align-items: center; }
.image-panel { border-radius: 32px; background: #fff; border: 1px solid var(--border); padding: 16px; box-shadow: var(--shadow); position: relative; overflow: hidden; }
.image-panel::after { content: ""; position: absolute; width: 180px; height: 180px; border-radius: 50%; background: rgba(41,128,254,.12); right: -60px; top: -60px; }
.image-panel img { position: relative; z-index: 1; border-radius: 24px; }
.feature-list { display: grid; gap: 12px; margin: 20px 0; }
.feature-list li, .check-list li { color: #344054; margin-bottom: 8px; }
.feature-list li::marker, .check-list li::marker { color: var(--blue); }
.global-nodes-section {
    position: relative;
    border-radius: 34px;
    overflow: hidden;
    background: linear-gradient(135deg, #f5f8ff 0%, #ffffff 55%, #eef4ff 100%);
    border: 1px solid var(--border);
    padding: 28px;
}
.global-nodes-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle, rgba(41,128,254,.30) 2px, transparent 2px),
        linear-gradient(115deg, transparent 0 36%, rgba(41,128,254,.12) 36% 37%, transparent 37%);
    background-size: 70px 70px, 100% 100%;
    opacity: .45;
}
.global-nodes-section > * { position: relative; }
.speed-lines { display: grid; gap: 12px; margin-top: 18px; }
.speed-line { padding: 14px; border-radius: 18px; border: 1px solid var(--border); background: #fff; display: flex; justify-content: space-between; gap: 12px; color: #344054; font-weight: 700; }
.privacy-panel { background: #fff; border: 1px solid var(--border); border-radius: 30px; padding: 26px; box-shadow: var(--shadow); }
.panel-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.panel-tags span { background: #f1f6ff; color: var(--blue); border: 1px solid #d9e8ff; padding: 8px 12px; border-radius: 999px; font-weight: 800; font-size: 13px; }
.card-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.service-card, .info-card { padding: 22px; }
.protocol-panel { background: #fff; border: 1px solid var(--border); border-radius: 28px; padding: 22px; box-shadow: var(--shadow); }
.protocol-row { display: grid; gap: 12px; }
.protocol-row div { border-left: 4px solid var(--blue); background: #f8fbff; padding: 14px 16px; border-radius: 16px; }
.process-steps { display: grid; grid-template-columns: 1fr; gap: 16px; }
.step-card { padding: 20px; position: relative; }
.step-num { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 14px; background: var(--blue); color: #fff; font-weight: 900; margin-bottom: 12px; }
.risk-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.risk-card { padding: 20px; border-left: 4px solid var(--blue); }
.faq-grid { display: grid; gap: 14px; }
.faq-item { padding: 20px; }
.faq-item h3 { font-size: 18px; margin-bottom: 8px; }
.cta-section { background: var(--gradient); color: #fff; padding: 58px 0; text-align: center; position: relative; overflow: hidden; }
.cta-section::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 20% 20%, rgba(255,255,255,.22), transparent 20%), radial-gradient(circle at 80% 70%, rgba(255,255,255,.16), transparent 18%); }
.cta-section .container { position: relative; }
.cta-section h2, .cta-section p { color: #fff; }
.page-hero { padding: 56px 0 34px; background: linear-gradient(180deg, #f7faff 0%, #fff 100%); border-bottom: 1px solid var(--border); }
.page-hero .summary { font-size: 18px; max-width: 850px; }
.article-layout { display: grid; gap: 24px; align-items: start; padding: 40px 0 68px; }
.article-main { display: grid; gap: 18px; }
.content-card { padding: 24px; }
.side-panel { border-radius: 24px; background: #f8fbff; border: 1px solid var(--border); padding: 22px; position: sticky; top: 92px; }
.side-panel a { display: block; color: var(--blue); font-weight: 800; margin: 10px 0; }
.notice-box { background: #f7faff; border: 1px solid #dce9ff; border-left: 4px solid var(--blue); border-radius: 18px; padding: 18px; margin: 16px 0; }
.download-strip { margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--border); }
.download-page-grid { display: grid; gap: 20px; }
.download-page-card { background: #fff; border: 1px solid var(--border); border-radius: 28px; padding: 26px; box-shadow: var(--shadow); }
.site-footer { background: #111827; color: #cbd5e1; padding: 52px 0 0; }
.footer-grid { display: grid; gap: 26px; }
.footer-brand { color: #fff; font-weight: 900; font-size: 22px; margin-bottom: 10px; }
.site-footer h3 { color: #fff; font-size: 17px; }
.site-footer a { display: block; color: #cbd5e1; margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); text-align: center; margin-top: 34px; padding: 18px 12px; color: #98a2b3; font-size: 14px; }
@media (min-width: 700px) {
    .node-grid { grid-template-columns: repeat(2, 1fr); }
    .card-grid { grid-template-columns: repeat(2, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .download-page-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
}
@media (min-width: 980px) {
    .nav-toggle-label { display: none; }
    .site-nav { position: static; display: flex; flex-direction: row; gap: 2px; padding: 0; border: 0; box-shadow: none; background: transparent; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
    .site-nav a { padding: 8px 10px; font-size: 13px; }
    .hero-grid { grid-template-columns: 1.04fr .96fr; }
    .vpn-network-hero { padding: 94px 0 76px; }
    .split-section { grid-template-columns: 1fr 1fr; }
    .split-section.reverse .image-panel { order: -1; }
    .node-grid { grid-template-columns: repeat(4, 1fr); }
    .card-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .article-layout { grid-template-columns: minmax(0, 1fr) 300px; }
    .section { padding: 86px 0; }
    .global-nodes-section { padding: 46px; }
}
@media (min-width: 1180px) {
    .site-nav a { padding: 8px 12px; font-size: 14px; }
}