:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --line: #e6eaf2;
    --white: #ffffff;
    --deep: #111827;
    --radius-lg: 28px;
    --radius-md: 20px;
    --shadow: 0 18px 45px rgba(37, 71, 170, 0.10);
}

* { box-sizing: border-box; }
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: #fff;
    line-height: 1.7;
    overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.section { padding: 68px 0; }
.section-light { background: var(--light); }
.section-title { margin: 0 0 14px; font-size: clamp(28px, 5vw, 44px); line-height: 1.18; color: var(--deep); }
.section-lead { margin: 0 0 28px; color: var(--muted); max-width: 760px; }
.eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, 0.10);
    color: var(--blue);
    font-weight: 700;
    font-size: 14px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    letter-spacing: 0.02em;
    box-shadow: 0 12px 28px rgba(41, 128, 254, 0.26);
    transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: #1768E8; transform: translateY(-2px); box-shadow: 0 16px 34px rgba(23, 104, 232, 0.30); }
.text-link { color: var(--blue); font-weight: 700; }
.text-link:hover { color: var(--blue-hover); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(230,234,242,0.9);
}
.header-inner { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; color: var(--deep); }
.brand-logo { width: 40px; height: 40px; border-radius: 12px; object-fit: cover; }
.brand-name { font-size: 22px; letter-spacing: .03em; }
.nav-toggle {
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #fff;
    color: var(--deep);
    padding: 9px 15px;
    font-weight: 700;
}
.main-nav {
    position: absolute;
    top: 70px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.main-nav.is-open { display: flex; }
.main-nav a { padding: 10px 12px; border-radius: 12px; color: #344054; font-weight: 700; font-size: 14px; }
.main-nav a:hover, .main-nav a.active { color: var(--blue); background: rgba(41,128,254,0.08); }

.vpn-network-hero {
    position: relative;
    overflow: hidden;
    padding: 68px 0 74px;
    color: #fff;
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
}
.vpn-network-hero::before, .vpn-network-hero::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: rgba(255,255,255,0.18);
    filter: blur(10px);
}
.vpn-network-hero::before { width: 280px; height: 280px; right: -60px; top: -70px; }
.vpn-network-hero::after { width: 340px; height: 340px; left: -160px; bottom: -140px; }
.network-lines {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 20% 35%, rgba(255,255,255,.35) 0 2px, transparent 3px), radial-gradient(circle at 80% 40%, rgba(255,255,255,.25) 0 2px, transparent 3px), linear-gradient(120deg, transparent 0 28%, rgba(255,255,255,.18) 28% 28.2%, transparent 28.2% 100%), linear-gradient(35deg, transparent 0 54%, rgba(255,255,255,.16) 54% 54.2%, transparent 54.2% 100%);
    opacity: .95;
}
.hero-grid { position: relative; z-index: 1; display: grid; gap: 34px; align-items: center; }
.hero-copy h1 { margin: 18px 0 16px; font-size: clamp(36px, 9vw, 64px); line-height: 1.06; letter-spacing: -0.04em; }
.hero-copy p { margin: 0 0 24px; color: rgba(255,255,255,.88); font-size: 17px; max-width: 680px; }
.hero-tags { margin: 22px 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags li { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.22); font-weight: 700; font-size: 14px; }
.hero-visual { position: relative; min-height: 300px; display: grid; place-items: center; }
.device-frame { position: relative; width: min(390px, 92%); padding: 18px; border-radius: 36px; background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.28); box-shadow: 0 28px 70px rgba(24, 35, 97, .25); }
.device-frame img { border-radius: 26px; }
.status-card { position: absolute; background: rgba(255,255,255,.93); color: #1d2939; border-radius: 16px; padding: 10px 14px; box-shadow: 0 14px 34px rgba(23,43,109,.18); font-size: 13px; font-weight: 800; }
.status-card.one { left: 0; top: 34px; }
.status-card.two { right: 0; top: 90px; }
.status-card.three { left: 8px; bottom: 58px; }
.status-card.four { right: 14px; bottom: 20px; }

.node-overview { margin-top: -38px; position: relative; z-index: 3; }
.overview-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.node-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 22px;
    box-shadow: var(--shadow);
}
.node-card .tag { display: inline-flex; color: #2980FE; background: rgba(41,128,254,.09); padding: 5px 10px; border-radius: 999px; font-weight: 800; font-size: 13px; }
.node-card h3 { margin: 14px 0 8px; color: var(--deep); font-size: 20px; }
.node-card p { margin: 0 0 12px; color: var(--muted); }

.split-section { display: grid; gap: 26px; align-items: center; }
.visual-card { border-radius: var(--radius-lg); background: #fff; border: 1px solid var(--line); padding: 18px; box-shadow: var(--shadow); }
.visual-card img { border-radius: 22px; width: 100%; }
.feature-list { margin: 20px 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.feature-list li { padding-left: 22px; position: relative; color: #344054; }
.feature-list li::before { content: ""; position: absolute; left: 0; top: 12px; width: 8px; height: 8px; border-radius: 999px; background: var(--blue); }
.vpn-connection-section, .global-nodes-section, .high-speed-section, .privacy-protection-section, .no-log-policy-section, .multi-device-section, .encryption-protocol-section { position: relative; }
.global-nodes-section { background: #f7f9ff; overflow: hidden; }
.map-panel {
    position: relative;
    border-radius: 32px;
    padding: 24px;
    min-height: 320px;
    background: radial-gradient(circle at 22% 20%, rgba(41,128,254,.16), transparent 32%), radial-gradient(circle at 78% 60%, rgba(184,77,218,.14), transparent 34%), #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.map-panel::before { content: ""; position: absolute; inset: 28px; border: 1px dashed rgba(41,128,254,.28); border-radius: 28px; }
.map-point { position: absolute; width: 12px; height: 12px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 8px rgba(41,128,254,.12); }
.map-point.p1 { left: 22%; top: 28%; }
.map-point.p2 { right: 24%; top: 34%; }
.map-point.p3 { left: 48%; bottom: 24%; }
.map-panel img { position: relative; z-index: 1; width: min(370px, 92%); margin: 24px auto 0; }
.speed-cards, .privacy-tags, .policy-grid, .device-grid, .protocol-grid, .risk-grid, .faq-grid, .article-grid, .safety-panel, .info-grid { display: grid; gap: 16px; }
.speed-card, .policy-card, .device-card, .protocol-card, .risk-card, .faq-item, .info-card, .safety-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 10px 28px rgba(29, 41, 57, .06);
}
.speed-card strong, .risk-card strong { display: block; color: var(--deep); margin-bottom: 6px; }
.speed-meter { height: 8px; border-radius: 999px; background: #e8eefb; overflow: hidden; margin-top: 12px; }
.speed-meter span { display: block; height: 100%; width: 72%; background: var(--blue); border-radius: inherit; }
.privacy-panel { background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 24px; box-shadow: var(--shadow); }
.privacy-tags { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 16px; }
.privacy-tags span { padding: 12px; border-radius: 16px; color: var(--blue); background: rgba(41,128,254,.08); font-weight: 800; text-align: center; }
.policy-grid, .protocol-grid, .device-grid, .info-grid { grid-template-columns: 1fr; }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.process-step { position: relative; padding: 22px 20px 20px 72px; background: #fff; border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 10px 28px rgba(29,41,57,.05); }
.process-step::before { counter-increment: step; content: counter(step); position: absolute; left: 20px; top: 20px; width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; color: #fff; background: var(--blue); font-weight: 900; }
.process-step h3, .risk-card h3, .faq-item h3 { margin: 0 0 8px; color: var(--deep); }
.process-step p, .risk-card p, .faq-item p { margin: 0 0 10px; color: var(--muted); }
.risk-card { border-left: 4px solid var(--blue); }
.cta-section {
    padding: 64px 0;
    color: #fff;
    background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    text-align: center;
}
.cta-section h2 { margin: 0 0 12px; font-size: clamp(28px, 6vw, 44px); }
.cta-section p { color: rgba(255,255,255,.86); max-width: 720px; margin: 0 auto 24px; }
.cta-section .download-btn { background: #2980FE; color: #fff; }

.page-hero { padding: 58px 0 36px; background: linear-gradient(180deg, #f7f9ff 0%, #fff 100%); }
.page-hero h1 { margin: 16px 0 12px; font-size: clamp(34px, 8vw, 54px); line-height: 1.12; color: var(--deep); }
.page-summary { max-width: 820px; color: var(--muted); font-size: 17px; margin: 0 0 22px; }
.page-shell { background: #fff; }
.content-layout { display: grid; gap: 24px; padding: 42px 0 76px; }
.content-card, .side-card, .download-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 12px 34px rgba(29,41,57,.06);
}
.content-card h2 { margin-top: 0; color: var(--deep); }
.content-card p { color: #475467; }
.check-list { padding: 0; margin: 16px 0; list-style: none; display: grid; gap: 10px; }
.check-list li { padding: 12px 14px; border-radius: 14px; background: #f7f9ff; border: 1px solid #e9eefb; }
.side-card h3 { margin-top: 0; }
.side-card a { display: block; color: var(--blue); font-weight: 800; margin-top: 10px; }
.notice-box { margin: 18px 0; padding: 18px; border-radius: 18px; background: rgba(41,128,254,.08); border: 1px solid rgba(41,128,254,.16); color: #344054; }
.download-panel { text-align: center; background: var(--gradient); color: #fff; }
.download-panel p { color: rgba(255,255,255,.86); }
.steps-list { counter-reset: item; list-style: none; padding: 0; display: grid; gap: 14px; }
.steps-list li { counter-increment: item; position: relative; padding: 16px 16px 16px 58px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.steps-list li::before { content: counter(item); position: absolute; left: 16px; top: 16px; width: 30px; height: 30px; border-radius: 50%; background: var(--blue); color: #fff; display: grid; place-items: center; font-weight: 900; }
.faq-page .faq-item { box-shadow: none; }
.about-values { display: grid; gap: 16px; }
.site-footer { padding: 52px 0 24px; background: #101828; color: #d0d5dd; }
.footer-grid { display: grid; gap: 28px; }
.footer-brand { color: #fff; font-size: 24px; font-weight: 900; margin-bottom: 12px; }
.site-footer h3 { color: #fff; margin: 0 0 12px; }
.site-footer a { display: block; color: #d0d5dd; margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 30px; border-top: 1px solid rgba(255,255,255,.12); padding-top: 18px; color: #98a2b3; }

@media (min-width: 700px) {
    .overview-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .policy-grid, .protocol-grid, .device-grid, .risk-grid, .info-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
}

@media (min-width: 980px) {
    .container { width: min(1180px, calc(100% - 48px)); }
    .nav-toggle { display: none; }
    .main-nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 2px; padding: 0; box-shadow: none; border: 0; background: transparent; }
    .main-nav a { padding: 8px 10px; }
    .vpn-network-hero { padding: 92px 0 118px; }
    .hero-grid, .split-section { grid-template-columns: 1.05fr .95fr; }
    .split-section.reverse .visual-card, .split-section.reverse .map-panel { order: -1; }
    .overview-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .speed-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .policy-grid, .protocol-grid, .device-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .content-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
    .content-layout.full { grid-template-columns: 1fr; }
    .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .about-values { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1120px); }
    .section { padding: 52px 0; }
    .status-card { position: static; margin-top: 10px; width: 100%; text-align: center; }
    .hero-visual { min-height: auto; }
    .download-btn { width: 100%; }
    .privacy-tags { grid-template-columns: 1fr; }
}