:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --line: #e6eaf2;
    --card: #ffffff;
    --shadow: 0 18px 45px rgba(31, 41, 55, .08);
    --radius: 24px;
}
* { box-sizing: border-box; }
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: #fff;
    line-height: 1.75;
    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; }
.section { padding: 64px 0; }
.section-soft { background: var(--light); }
.section-title { font-size: clamp(28px, 4vw, 46px); line-height: 1.18; margin: 0 0 18px; letter-spacing: -.04em; }
.section-subtitle { margin: 0 0 28px; color: var(--muted); max-width: 760px; }
.text-link { color: var(--blue); font-weight: 700; display: inline-flex; align-items: center; gap: 6px; }
.text-link::after { content: "→"; }
.badge, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, .1);
    color: var(--blue);
    font-weight: 700;
    font-size: 13px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(41, 128, 254, .28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: #1768E8; transform: translateY(-2px); box-shadow: 0 16px 34px rgba(23, 104, 232, .34); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}
.header-inner {
    width: min(1180px, calc(100% - 24px));
    min-height: 72px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 900; letter-spacing: -.02em; }
.brand-logo { width: 40px; height: 40px; border-radius: 12px; object-fit: cover; }
.brand-text { white-space: nowrap; }
.nav-toggle { display: none; }
.nav-toggle-label { width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 14px; display: grid; place-content: center; gap: 5px; cursor: pointer; }
.nav-toggle-label span { width: 20px; height: 2px; background: var(--text); display: block; border-radius: 2px; }
.main-nav {
    position: absolute;
    top: 72px;
    left: 12px;
    right: 12px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow);
}
.main-nav a { padding: 10px 12px; border-radius: 12px; color: #344054; font-weight: 700; }
.main-nav a:hover { background: #f0f5ff; color: var(--blue); }
.nav-toggle:checked ~ .main-nav { display: flex; }
.vpn-network-hero {
    position: relative;
    overflow: hidden;
    padding: 76px 0 58px;
    background: var(--gradient);
    color: #fff;
}
.vpn-network-hero::before, .vpn-network-hero::after {
    content: "";
    position: absolute;
    inset: auto;
    border-radius: 999px;
    background: rgba(255,255,255,.22);
    filter: blur(20px);
}
.vpn-network-hero::before { width: 260px; height: 260px; right: -70px; top: -80px; }
.vpn-network-hero::after { width: 360px; height: 120px; left: 12%; bottom: -70px; }
.hero-grid { position: relative; z-index: 1; display: grid; gap: 36px; align-items: center; }
.hero-copy h1 { font-size: clamp(36px, 7vw, 66px); line-height: 1.08; margin: 14px 0 18px; letter-spacing: -.055em; }
.hero-copy p { color: rgba(255,255,255,.86); font-size: 17px; margin: 0 0 26px; max-width: 680px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.hero-tags span, .status-tag { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.16); color: #fff; border: 1px solid rgba(255,255,255,.24); font-weight: 700; font-size: 13px; }
.hero-visual { position: relative; min-height: 320px; display: grid; place-items: center; }
.hero-visual::before {
    content: "";
    position: absolute;
    width: 92%;
    height: 92%;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,.24);
    background:
      radial-gradient(circle at 30% 20%, rgba(255,255,255,.35) 0 5px, transparent 6px),
      radial-gradient(circle at 70% 35%, rgba(255,255,255,.32) 0 4px, transparent 5px),
      radial-gradient(circle at 52% 72%, rgba(255,255,255,.28) 0 6px, transparent 7px);
}
.hero-visual img { position: relative; z-index: 2; max-height: 430px; object-fit: contain; filter: drop-shadow(0 30px 60px rgba(20, 20, 80, .28)); }
.float-card { position: absolute; z-index: 3; padding: 12px 14px; border-radius: 16px; background: rgba(255,255,255,.92); color: #243047; box-shadow: 0 16px 36px rgba(16,24,40,.16); font-weight: 800; font-size: 13px; }
.float-card.one { left: 2%; top: 12%; }
.float-card.two { right: 4%; top: 24%; }
.float-card.three { left: 8%; bottom: 14%; }
.float-card.four { right: 8%; bottom: 10%; }
.node-overview { margin-top: -34px; position: relative; z-index: 2; }
.node-overview-grid { display: grid; gap: 16px; }
.node-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 22px;
    box-shadow: var(--shadow);
}
.node-card .mini-label { color: var(--blue); font-size: 12px; font-weight: 900; letter-spacing: .08em; }
.node-card h3, .feature-card h3, .risk-card h3, .policy-card h3, .step-card h3 { margin: 10px 0 8px; line-height: 1.3; }
.node-card p, .feature-card p, .risk-card p, .policy-card p, .step-card p { margin: 0 0 14px; color: var(--muted); }
.split-section, .vpn-connection-section, .global-nodes-section, .high-speed-section, .privacy-protection-section, .multi-device-section, .encryption-protocol-section {
    display: grid;
    gap: 28px;
    align-items: center;
}
.image-panel {
    border-radius: 28px;
    background: #fff;
    border: 1px solid var(--line);
    padding: 20px;
    box-shadow: var(--shadow);
    overflow: hidden;
}
.image-panel.soft { background: linear-gradient(180deg, #f7f9ff 0%, #ffffff 100%); }
.feature-list { display: grid; gap: 12px; margin: 22px 0; padding: 0; list-style: none; }
.feature-list li { display: flex; gap: 10px; color: #384252; }
.feature-list li::before { content: ""; flex: 0 0 9px; width: 9px; height: 9px; margin-top: 10px; border-radius: 50%; background: var(--blue); }
.global-nodes-section {
    position: relative;
    padding: 32px;
    border-radius: 30px;
    background:
      radial-gradient(circle at 20% 28%, rgba(41,128,254,.18), transparent 24%),
      radial-gradient(circle at 76% 64%, rgba(123,78,241,.14), transparent 25%),
      #fff;
    border: 1px solid var(--line);
    overflow: hidden;
}
.global-nodes-section::before {
    content: "";
    position: absolute;
    inset: 28px;
    border-radius: 26px;
    border: 1px dashed rgba(41,128,254,.24);
    pointer-events: none;
}
.global-nodes-section > * { position: relative; z-index: 1; }
.speed-lines { display: grid; gap: 12px; margin: 20px 0; }
.speed-line { padding: 14px 16px; background: #fff; border: 1px solid var(--line); border-radius: 16px; display: flex; justify-content: space-between; gap: 16px; font-weight: 800; }
.speed-line span { color: var(--muted); font-weight: 600; }
.privacy-panel, .tech-panel, .safety-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
}
.panel-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.panel-tags span { padding: 8px 12px; border-radius: 999px; background: #eef5ff; color: #1e63d6; font-weight: 800; font-size: 13px; }
.no-log-policy-section { display: grid; gap: 16px; }
.policy-card, .feature-card, .step-card, .risk-card, .faq-item, .help-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 22px;
}
.card-grid { display: grid; gap: 16px; }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding-top: 58px; }
.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    top: 18px;
    left: 22px;
    color: var(--blue);
    font-weight: 900;
    letter-spacing: .08em;
}
.risk-grid { display: grid; gap: 16px; }
.risk-card { border-left: 4px solid var(--blue); }
.risk-card strong { display: block; color: #344054; margin-top: 10px; }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin: 0 0 8px; line-height: 1.35; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section {
    padding: 70px 0;
    background: var(--gradient);
    color: #fff;
    text-align: center;
    overflow: hidden;
}
.cta-box { width: min(820px, calc(100% - 32px)); margin: 0 auto; }
.cta-section h2 { font-size: clamp(28px, 5vw, 46px); line-height: 1.18; margin: 0 0 14px; letter-spacing: -.04em; }
.cta-section p { color: rgba(255,255,255,.86); margin: 0 auto 26px; max-width: 660px; }
.page-hero {
    padding: 58px 0 40px;
    background: linear-gradient(180deg, #f4f7ff 0%, #fff 100%);
}
.page-hero h1 { font-size: clamp(32px, 5vw, 54px); line-height: 1.15; margin: 14px 0 14px; letter-spacing: -.045em; }
.page-hero p { color: var(--muted); max-width: 760px; margin: 0; font-size: 17px; }
.content-layout { display: grid; gap: 24px; align-items: start; }
.article-panel { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.article-panel h2 { margin-top: 0; font-size: 24px; }
.article-panel p { color: #4b5565; }
.side-panel { background: #f7f9ff; border: 1px solid var(--line); border-radius: 24px; padding: 22px; }
.side-panel a { display: block; padding: 11px 0; color: var(--blue); font-weight: 800; border-bottom: 1px solid var(--line); }
.side-panel a:last-child { border-bottom: 0; }
.check-list, .plain-list { margin: 14px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.check-list li, .plain-list li { padding: 12px 14px; border-radius: 14px; background: #f7f9ff; color: #4b5565; }
.download-panel { text-align: center; background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 30px; box-shadow: var(--shadow); }
.download-steps { display: grid; gap: 14px; margin-top: 24px; text-align: left; }
.download-steps div { padding: 16px; border-radius: 18px; background: #f7f9ff; border: 1px solid var(--line); }
.site-footer { background: #101828; color: #d0d5dd; padding-top: 46px; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { color: #fff; font-size: 20px; font-weight: 900; margin-bottom: 10px; }
.site-footer h3 { color: #fff; margin: 0 0 10px; font-size: 16px; }
.site-footer a { display: block; color: #d0d5dd; padding: 5px 0; }
.footer-bottom { margin-top: 34px; padding: 18px 16px; text-align: center; border-top: 1px solid rgba(255,255,255,.12); font-size: 14px; color: #98a2b3; }
@media (min-width: 680px) {
    .node-overview-grid, .card-grid, .risk-grid, .process-steps, .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .no-log-policy-section { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 940px) {
    .nav-toggle-label { display: none; }
    .main-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; border: 0; box-shadow: none; background: transparent; gap: 2px; }
    .main-nav a { font-size: 14px; padding: 9px 10px; }
    .hero-grid, .split-section, .vpn-connection-section, .high-speed-section, .privacy-protection-section, .multi-device-section, .encryption-protocol-section, .content-layout { grid-template-columns: 1.02fr .98fr; }
    .global-nodes-section { grid-template-columns: 1fr 1fr; }
    .node-overview-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: 1.25fr .75fr .75fr .75fr; }
    .article-panel { padding: 34px; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1120px); }
    .vpn-network-hero { padding: 54px 0 46px; }
    .section { padding: 50px 0; }
    .float-card { position: static; margin: 8px; display: inline-flex; }
    .hero-visual { display: block; text-align: center; }
    .hero-visual img { margin: 0 auto 10px; max-height: 300px; }
    .global-nodes-section { padding: 22px; }
}