:root {
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --deep: #172033;
    --text: #334155;
    --muted: #667085;
    --light: #F6F8FC;
    --soft: #EEF4FF;
    --border: #E3E8F2;
    --white: #FFFFFF;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --shadow: 0 18px 44px rgba(25, 42, 90, .10);
    --radius: 26px;
}
* { 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: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.content-container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.gradient-bg { background: var(--gradient); color: #fff; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(227,232,242,.9);
}
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.logo { display: inline-flex; align-items: center; gap: 10px; color: var(--deep); font-weight: 800; font-size: 18px; }
.logo img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.primary-nav { display: none; flex-direction: column; gap: 8px; width: 100%; padding: 14px 0 18px; }
.primary-nav a { padding: 9px 12px; border-radius: 999px; color: #475467; font-size: 14px; }
.primary-nav a:hover, .primary-nav a.active { color: var(--blue); background: #EEF4FF; }
.nav-toggle { display: none; }
.mobile-nav { width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 14px; display: grid; place-content: center; gap: 5px; cursor: pointer; }
.mobile-nav span { width: 18px; height: 2px; background: var(--deep); display: block; border-radius: 2px; }
.nav-toggle:checked ~ .primary-nav { display: flex; position: absolute; left: 0; top: 72px; background: #fff; padding-left: 16px; padding-right: 16px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow); }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(41,128,254,.26);
    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 32px rgba(41,128,254,.32); }
.section { padding: 72px 0; }
.section-alt { background: var(--light); }
.section-kicker { color: var(--blue); font-weight: 800; letter-spacing: .04em; font-size: 13px; margin-bottom: 10px; }
.section-title { color: var(--deep); font-size: clamp(28px, 4vw, 44px); line-height: 1.2; margin: 0 0 16px; letter-spacing: -.03em; }
.section-lead { color: var(--muted); font-size: 16px; margin: 0 0 28px; max-width: 760px; }
.text-link { color: var(--blue); font-weight: 800; }
.text-link:hover { color: var(--blue-dark); }
.vpn-lab-hero {
    position: relative;
    padding: 76px 0 48px;
    background: var(--gradient);
    color: #fff;
    overflow: hidden;
}
.vpn-lab-hero::before, .vpn-lab-hero::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    filter: blur(6px);
}
.vpn-lab-hero::before { width: 280px; height: 280px; right: -90px; top: 40px; }
.vpn-lab-hero::after { width: 180px; height: 180px; left: 10%; bottom: -70px; }
.lab-hero-grid { position: relative; z-index: 1; display: grid; gap: 34px; align-items: center; }
.hero-copy h1 { font-size: clamp(34px, 8vw, 62px); line-height: 1.08; margin: 0 0 18px; letter-spacing: -.045em; }
.hero-copy p { color: rgba(255,255,255,.86); font-size: 17px; margin: 0 0 24px; max-width: 650px; }
.hero-tags, .status-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span, .status-tags span, .tag-row span, .category-badge {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.14);
    color: #fff;
    border: 1px solid rgba(255,255,255,.22);
    font-size: 13px;
    font-weight: 700;
}
.hero-copy .download-btn { margin-bottom: 18px; background: var(--blue); }
.lab-visual { position: relative; min-height: 360px; display: grid; place-items: center; }
.lab-device-card {
    position: relative;
    width: min(420px, 92%);
    padding: 18px;
    border-radius: 34px;
    background: rgba(255,255,255,.17);
    border: 1px solid rgba(255,255,255,.30);
    box-shadow: 0 30px 80px rgba(18,29,69,.22);
    backdrop-filter: blur(18px);
}
.lab-device-card img { border-radius: 24px; background: #fff; width: 100%; }
.float-card {
    position: absolute;
    min-width: 130px;
    padding: 12px 14px;
    border-radius: 18px;
    background: rgba(255,255,255,.92);
    color: var(--deep);
    box-shadow: 0 16px 36px rgba(21,31,69,.16);
    font-size: 13px;
    font-weight: 800;
}
.float-card small { display: block; color: var(--muted); font-weight: 600; margin-top: 2px; }
.float-card.one { left: 0; top: 28px; }
.float-card.two { right: 0; top: 86px; }
.float-card.three { left: 8px; bottom: 54px; }
.float-card.four { right: 18px; bottom: 8px; }
.privacy-summary { margin-top: -38px; position: relative; z-index: 3; }
.summary-grid, .card-grid, .risk-grid, .faq-grid, .feature-list, .related-grid { display: grid; gap: 18px; }
.security-card, .service-card, .risk-card, .faq-item, .info-panel, .step-card, .page-card, .notice-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.security-card { padding: 26px; }
.security-card .mini-label, .mini-label { display: inline-flex; align-items: center; color: var(--blue); background: #EEF4FF; border-radius: 999px; padding: 4px 10px; font-size: 12px; font-weight: 800; margin-bottom: 14px; }
.security-card h2, .security-card h3, .service-card h3, .risk-card h3, .faq-item h3, .info-panel h3, .step-card h3, .notice-card h3 { margin: 0 0 10px; color: var(--deep); line-height: 1.3; }
.security-card p, .service-card p, .risk-card p, .faq-item p, .info-panel p, .step-card p, .notice-card p { margin: 0 0 14px; color: var(--muted); }
.module-grid, .module-grid.reverse { display: grid; gap: 28px; align-items: center; }
.module-image { border-radius: 32px; background: linear-gradient(135deg, #F4F7FF, #FFFFFF); padding: 18px; border: 1px solid var(--border); box-shadow: var(--shadow); }
.module-image img { border-radius: 24px; width: 100%; }
.module-content .points { margin: 20px 0; display: grid; gap: 12px; padding: 0; list-style: none; }
.module-content .points li { position: relative; padding-left: 26px; color: #475467; }
.module-content .points li::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); position: absolute; left: 0; top: .72em; box-shadow: 0 0 0 5px #EEF4FF; }
.privacy-protection-section .privacy-panel, .no-log-policy-section .policy-grid, .encryption-protocol-section .protocol-panel {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 32px;
    padding: 28px;
    box-shadow: var(--shadow);
}
.privacy-panel { display: grid; gap: 20px; }
.policy-grid, .protocol-grid { display: grid; gap: 16px; }
.policy-item, .protocol-item { background: #F8FAFF; border: 1px solid var(--border); border-radius: 22px; padding: 20px; }
.policy-item strong, .protocol-item strong { display: block; color: var(--deep); margin-bottom: 8px; }
.safety-panel {
    border-radius: 34px;
    padding: 30px;
    border: 1px solid var(--border);
    background: linear-gradient(135deg, #FFFFFF 0%, #F5F8FF 100%);
    box-shadow: var(--shadow);
}
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { padding: 22px; position: relative; overflow: hidden; }
.step-number { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 14px; color: #fff; font-weight: 900; background: var(--blue); margin-bottom: 14px; }
.risk-grid { margin-top: 24px; }
.risk-card { padding: 22px; border-left: 4px solid var(--blue); box-shadow: none; }
.faq-grid { margin-top: 24px; }
.faq-item { padding: 24px; box-shadow: none; }
.cta-section { padding: 70px 0; background: var(--gradient); color: #fff; text-align: center; }
.cta-section h2 { margin: 0 0 14px; font-size: clamp(28px, 5vw, 46px); line-height: 1.2; }
.cta-section p { max-width: 720px; margin: 0 auto 24px; color: rgba(255,255,255,.86); }
.page-hero { padding: 64px 0 34px; background: linear-gradient(180deg, #F8FAFF 0%, #FFFFFF 100%); }
.page-hero .category-badge { background: #EEF4FF; color: var(--blue); border-color: #D9E7FF; }
.page-hero h1 { color: var(--deep); font-size: clamp(32px, 6vw, 54px); line-height: 1.15; margin: 16px 0; letter-spacing: -.04em; }
.page-hero p { max-width: 820px; color: var(--muted); font-size: 17px; margin: 0; }
.page-layout { display: grid; gap: 24px; padding: 46px 0 72px; }
.article-body { display: grid; gap: 22px; }
.page-card { padding: 26px; box-shadow: none; }
.page-card h2 { margin: 0 0 12px; color: var(--deep); }
.page-card p { margin: 0 0 14px; color: var(--text); }
.check-list, .number-list { margin: 14px 0 0; padding-left: 20px; color: #475467; }
.check-list li, .number-list li { margin: 8px 0; }
.aside-panel { display: grid; gap: 16px; align-content: start; }
.notice-card { padding: 22px; box-shadow: none; background: #F8FAFF; }
.download-panel { text-align: center; padding: 28px; background: #fff; border: 1px solid var(--border); border-radius: 28px; box-shadow: var(--shadow); }
.download-page-grid { display: grid; gap: 24px; }
.install-steps { display: grid; gap: 14px; margin-top: 20px; }
.install-step { display: flex; gap: 14px; align-items: flex-start; background: #F8FAFF; border: 1px solid var(--border); border-radius: 20px; padding: 18px; }
.install-step span { flex: 0 0 34px; height: 34px; border-radius: 12px; display: grid; place-items: center; background: var(--blue); color: #fff; font-weight: 900; }
.site-footer { padding: 52px 0 24px; background: #111827; color: #D0D5DD; }
.footer-grid { display: grid; gap: 26px; }
.footer-brand { color: #fff; font-weight: 900; font-size: 22px; margin-bottom: 10px; }
.site-footer h3 { color: #fff; margin: 0 0 12px; font-size: 15px; }
.site-footer a { display: block; color: #D0D5DD; margin: 8px 0; font-size: 14px; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 32px; padding-top: 18px; display: flex; flex-direction: column; gap: 8px; font-size: 13px; color: #98A2B3; }
@media (min-width: 720px) {
    .content-container { width: min(1120px, calc(100% - 56px)); }
    .summary-grid { grid-template-columns: repeat(3, 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: 1.05fr .95fr; align-items: start; }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}
@media (min-width: 980px) {
    .mobile-nav { display: none; }
    .desktop-nav { display: flex; flex-direction: row; align-items: center; width: auto; padding: 0; gap: 4px; }
    .nav-toggle:checked ~ .primary-nav { position: static; box-shadow: none; border: 0; padding: 0; }
    .lab-hero-grid { grid-template-columns: 1.02fr .98fr; }
    .module-grid { grid-template-columns: 1fr 1fr; }
    .module-grid.reverse .module-image { order: 2; }
    .privacy-panel { grid-template-columns: .9fr 1.1fr; }
    .policy-grid { grid-template-columns: repeat(3, 1fr); }
    .protocol-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
    .page-hero { padding-top: 82px; }
}
@media (max-width: 520px) {
    .content-container { width: min(100% - 24px, 1120px); }
    .vpn-lab-hero { padding-top: 52px; }
    .float-card { position: static; margin: 8px; display: inline-block; }
    .lab-visual { display: block; min-height: auto; }
    .lab-device-card { margin: 0 auto 10px; }
    .download-btn { width: 100%; }
    .section { padding: 54px 0; }
}