:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #263142;
    --muted: #687386;
    --line: #E7ECF4;
    --soft: #F5F7FB;
    --soft-blue: #F1F6FF;
    --white: #FFFFFF;
    --shadow: 0 16px 45px rgba(40, 65, 130, 0.10);
    --radius: 24px;
}
* { 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: 1.75;
    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; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}
.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;
}
.brand-link { display: flex; align-items: center; gap: 10px; font-weight: 800; color: #1B2A41; flex-shrink: 0; }
.logo-img { width: 40px; height: 40px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 18px rgba(41,128,254,.18); }
.brand-text { letter-spacing: .2px; }
.nav-toggle { width: 42px; height: 42px; border: 1px solid var(--line); background: #fff; border-radius: 14px; display: inline-flex; flex-direction: column; justify-content: center; align-items: center; gap: 5px; }
.nav-toggle span { width: 18px; height: 2px; background: #28384F; border-radius: 4px; }
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    display: none;
    flex-direction: column;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.site-nav.is-open { display: flex; }
.site-nav a { padding: 10px 12px; color: #4E5C70; font-size: 15px; border-radius: 12px; }
.site-nav a.active, .site-nav a:hover { color: var(--blue); background: var(--soft-blue); }
.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: 700;
    box-shadow: 0 14px 28px rgba(41,128,254,.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 18px 36px rgba(23,104,232,.28); }
.text-link { color: var(--blue); font-weight: 700; }
.text-link:hover { color: var(--blue-dark); }
.section-kicker, .category-badge { display: inline-flex; align-items: center; gap: 8px; color: var(--blue); background: #EEF5FF; border: 1px solid #DCEAFF; border-radius: 999px; padding: 6px 12px; font-weight: 700; font-size: 13px; }
.section-title { font-size: clamp(28px, 5vw, 42px); line-height: 1.2; margin: 14px 0 12px; color: #172033; }
.section-desc { color: var(--muted); margin: 0 0 24px; font-size: 16px; }
.vpn-dashboard-hero {
    background: var(--gradient);
    color: #fff;
    padding: 48px 0 42px;
    overflow: hidden;
    position: relative;
}
.vpn-dashboard-hero::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 80% 20%, rgba(255,255,255,.28), transparent 25%), radial-gradient(circle at 20% 80%, rgba(255,255,255,.18), transparent 28%); pointer-events: none; }
.hero-grid { position: relative; display: grid; gap: 32px; align-items: center; }
.hero-copy h1 { font-size: clamp(34px, 9vw, 64px); line-height: 1.08; margin: 10px 0 18px; letter-spacing: -1.6px; }
.hero-copy p { color: rgba(255,255,255,.86); font-size: 17px; margin: 0 0 24px; max-width: 620px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.hero-tags span { border: 1px solid rgba(255,255,255,.35); background: rgba(255,255,255,.14); color: #fff; padding: 8px 12px; border-radius: 999px; font-size: 13px; }
.hero-panel { position: relative; min-height: 360px; }
.hero-visual-card { background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.22); border-radius: 30px; padding: 24px; box-shadow: 0 28px 70px rgba(22,26,79,.24); backdrop-filter: blur(16px); }
.hero-visual-card img { width: min(360px, 86%); margin: 0 auto; filter: drop-shadow(0 24px 34px rgba(20,25,70,.22)); }
.status-card { position: relative; margin: 10px 0 0; background: rgba(255,255,255,.92); color: #213047; border: 1px solid rgba(255,255,255,.6); border-radius: 18px; padding: 12px 14px; box-shadow: 0 16px 40px rgba(32,45,90,.16); font-size: 14px; }
.status-card strong { display: block; color: #15233B; }
.status-row { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; margin-top: 12px; }
.service-index { padding: 52px 0 30px; background: linear-gradient(180deg, #fff 0%, #F7FAFF 100%); }
.index-head { max-width: 720px; margin-bottom: 24px; }
.service-grid, .category-grid { display: grid; gap: 16px; }
.service-card, .info-card, .risk-card, .faq-item, .step-card, .tip-card, .content-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 10px 26px rgba(37,57,104,.06);
}
.service-card { min-height: 172px; display: flex; flex-direction: column; justify-content: space-between; }
.service-card .tag { width: fit-content; color: var(--blue); background: #EEF5FF; border-radius: 999px; padding: 5px 10px; font-size: 12px; font-weight: 700; }
.service-card h3, .info-card h3, .risk-card h3, .step-card h3 { margin: 12px 0 8px; color: #182337; font-size: 20px; line-height: 1.35; }
.service-card p, .info-card p, .risk-card p, .step-card p, .tip-card p { margin: 0; color: var(--muted); }
.feature-section { padding: 44px 0; }
.feature-section.soft { background: var(--soft); }
.feature-layout { display: grid; gap: 28px; align-items: center; }
.feature-layout.reverse .feature-media { order: -1; }
.feature-copy ul { padding-left: 20px; color: var(--muted); margin: 0 0 20px; }
.feature-copy li { margin: 6px 0; }
.feature-media { background: linear-gradient(180deg, #FFFFFF, #F5F8FF); border: 1px solid var(--line); border-radius: 30px; padding: 24px; box-shadow: var(--shadow); }
.feature-media img { margin: 0 auto; max-height: 330px; object-fit: contain; }
.privacy-protection-section .safety-panel, .no-log-policy-section .safety-panel, .encryption-protocol-section .safety-panel {
    display: grid;
    gap: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 20px;
    box-shadow: var(--shadow);
}
.safety-line { border-left: 4px solid var(--blue); padding: 12px 14px; background: #F7FAFF; border-radius: 14px; }
.safety-line strong { display: block; color: #172033; }
.process-section, .risk-section, .faq-summary, .cta-section { padding: 48px 0; }
.process-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; padding-left: 76px; }
.step-card::before { counter-increment: step; content: counter(step); position: absolute; left: 22px; top: 22px; width: 38px; height: 38px; display: grid; place-items: center; border-radius: 14px; background: var(--blue); color: #fff; font-weight: 800; }
.risk-grid { display: grid; gap: 14px; }
.risk-card { border-top: 4px solid var(--blue); }
.risk-card .action { margin-top: 10px; color: #35425A; background: #F4F8FF; border-radius: 12px; padding: 10px 12px; }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; color: #172033; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section { background: var(--gradient); color: #fff; text-align: center; }
.cta-section .container { max-width: 820px; }
.cta-section h2 { font-size: clamp(28px, 6vw, 44px); margin: 0 0 12px; }
.cta-section p { color: rgba(255,255,255,.86); margin: 0 auto 24px; }
.page-hero { padding: 52px 0 30px; background: linear-gradient(180deg, #F4F7FF 0%, #fff 100%); }
.page-hero h1 { font-size: clamp(32px, 7vw, 52px); line-height: 1.15; margin: 16px 0 14px; color: #172033; }
.page-hero p { color: var(--muted); max-width: 790px; margin: 0 0 22px; }
.page-layout { display: grid; gap: 24px; padding: 34px 0 56px; }
.article-main { display: grid; gap: 18px; }
.article-main h2 { font-size: 26px; margin: 0 0 4px; color: #172033; }
.article-main p { color: var(--muted); margin: 0; }
.side-panel { align-self: start; background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 22px; box-shadow: var(--shadow); }
.side-panel h3 { margin: 0 0 12px; }
.check-list { padding: 0; list-style: none; display: grid; gap: 10px; margin: 0; }
.check-list li { position: relative; padding-left: 26px; color: var(--muted); }
.check-list li::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); position: absolute; left: 0; top: .7em; }
.two-col { display: grid; gap: 16px; }
.download-page .download-card { text-align: center; }
.download-page .download-card .download-btn { margin: 8px auto 0; }
.site-footer { background: #172033; color: rgba(255,255,255,.76); padding: 44px 0 0; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { color: #fff; font-size: 22px; font-weight: 800; margin-bottom: 10px; }
.site-footer h3 { color: #fff; margin: 0 0 10px; font-size: 16px; }
.site-footer a { display: block; margin: 7px 0; color: rgba(255,255,255,.72); }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 34px; padding: 18px; text-align: center; border-top: 1px solid rgba(255,255,255,.10); color: rgba(255,255,255,.58); font-size: 14px; }
@media (min-width: 640px) {
    .service-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .risk-grid, .two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .status-row { grid-template-columns: repeat(3, minmax(0,1fr)); }
}
@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; background: transparent; border: 0; box-shadow: none; gap: 2px; }
    .site-nav a { font-size: 14px; padding: 9px 10px; }
    .vpn-dashboard-hero { padding: 72px 0 64px; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; gap: 46px; }
    .hero-panel { min-height: 430px; }
    .status-card { position: absolute; width: 190px; margin: 0; }
    .status-card.one { top: 24px; right: 0; }
    .status-card.two { bottom: 96px; left: 0; }
    .status-card.three { bottom: 20px; right: 40px; }
    .status-card.four { top: 128px; left: -10px; }
    .status-card.five { top: 206px; right: -6px; }
    .service-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
    .service-card.featured { grid-column: span 2; }
    .feature-layout { grid-template-columns: 1fr 1fr; gap: 44px; }
    .feature-layout.reverse .feature-media { order: 2; }
    .process-steps { grid-template-columns: repeat(3, minmax(0,1fr)); }
    .risk-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .footer-grid { grid-template-columns: 1.4fr .8fr .8fr .8fr; }
}
@media (min-width: 1120px) {
    .site-nav a { padding: 9px 12px; }
    .feature-section { padding: 64px 0; }
}