:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1F2937;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E7EAF0;
    --white: #FFFFFF;
    --shadow: 0 18px 50px rgba(28, 45, 92, .10);
    --radius-lg: 32px;
    --radius-md: 24px;
    --radius-sm: 16px;
}
* { 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%; height: auto; display: block; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255,255,255,.92);
    border-bottom: 1px solid rgba(231,234,240,.9);
    backdrop-filter: blur(18px);
}
.header-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #111827; }
.logo-img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 24px rgba(41,128,254,.18); }
.brand-text { white-space: nowrap; letter-spacing: -.02em; }
.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: #25314a; border-radius: 99px; }
.site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 76px; padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
.site-nav.is-open { display: grid; gap: 6px; }
.site-nav a { color: #4B5563; padding: 10px 12px; border-radius: 12px; font-size: 14px; }
.site-nav a:hover { color: var(--blue); background: #F3F7FF; }
.content-container, .container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.section { padding: 64px 0; }
.section-soft { background: var(--light); }
.section-title { max-width: 760px; margin: 0 auto 30px; text-align: center; }
.section-title .eyebrow, .eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: 999px; background: #ECF4FF; color: var(--blue); font-weight: 700; font-size: 13px; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 14px; letter-spacing: -.03em; }
h1 { font-size: clamp(34px, 7vw, 66px); }
h2 { font-size: clamp(28px, 4vw, 44px); }
h3 { font-size: 21px; }
p { margin: 0 0 16px; color: var(--muted); }
.lead { font-size: 18px; color: #475467; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 30px rgba(41,128,254,.28);
    border: 0;
    cursor: pointer;
    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(41,128,254,.34); }
.text-link { color: var(--blue); font-weight: 700; }
.text-link:hover { color: var(--blue-dark); }
.pill-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0; }
.pill { display: inline-flex; padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.16); color: #fff; border: 1px solid rgba(255,255,255,.24); font-size: 13px; font-weight: 700; }
.pill.light { color: #344054; background: #F7F9FC; border-color: var(--line); }
.vpn-saas-hero {
    position: relative;
    margin: 18px auto 0;
    width: min(1220px, calc(100% - 24px));
    border-radius: 28px;
    overflow: hidden;
    background: var(--gradient);
    color: #fff;
}
.vpn-saas-hero:after {
    content: "";
    position: absolute;
    right: -12%;
    bottom: -24%;
    width: 65%;
    height: 62%;
    background: rgba(255,255,255,.12);
    transform: skewY(-10deg);
    border-radius: 80px 0 0 0;
}
.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    padding: 46px 22px;
}
.hero-copy p { color: rgba(255,255,255,.86); max-width: 650px; }
.hero-copy .download-btn { background: var(--blue); color: #fff; }
.hero-visual { position: relative; min-height: 340px; display: flex; align-items: center; justify-content: center; }
.product-phone {
    width: min(380px, 86%);
    padding: 18px;
    border-radius: 34px;
    background: rgba(255,255,255,.20);
    border: 1px solid rgba(255,255,255,.28);
    box-shadow: 0 28px 80px rgba(21,24,54,.25);
}
.product-phone img { border-radius: 26px; background: #fff; }
.float-card {
    position: absolute;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 18px;
    background: rgba(255,255,255,.92);
    color: #24304C;
    box-shadow: 0 14px 36px rgba(15,23,42,.16);
    font-size: 13px;
    font-weight: 800;
}
.float-card.one { top: 18px; left: 8px; }
.float-card.two { top: 80px; right: 0; }
.float-card.three { bottom: 60px; left: 0; }
.float-card.four { bottom: 6px; right: 22px; }
.product-highlights { display: grid; gap: 16px; }
.highlight-card, .card, .faq-item, .risk-card, .step-card, .info-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 32px rgba(16,24,40,.05);
}
.highlight-card { padding: 24px; }
.card { padding: 26px; }
.highlight-tag { display: inline-flex; align-items: center; color: var(--blue); background: #EFF6FF; padding: 5px 10px; border-radius: 999px; font-size: 12px; font-weight: 800; margin-bottom: 14px; }
.feature-split, .vpn-connection-section, .high-speed-section, .global-nodes-section, .multi-device-section, .encryption-protocol-section {
    display: grid;
    gap: 26px;
    align-items: center;
}
.feature-panel {
    position: relative;
    border-radius: var(--radius-lg);
    padding: 30px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.feature-panel.gradient-background { background: var(--gradient); color: #fff; }
.feature-panel.gradient-background p { color: rgba(255,255,255,.86); }
.feature-panel img { border-radius: 26px; margin: 0 auto; }
.bullet-grid { display: grid; gap: 12px; margin: 22px 0; }
.bullet-grid span, .mini-item { padding: 13px 15px; border: 1px solid var(--line); border-radius: 16px; background: #FBFCFF; color: #344054; font-weight: 700; }
.high-speed-section { background: #F6F9FF; border-radius: var(--radius-lg); padding: 28px; }
.speed-lines { display: grid; gap: 12px; }
.speed-line { padding: 16px; border-radius: 18px; background: #fff; border: 1px solid #E6EEFF; }
.privacy-protection-section { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 28px; box-shadow: var(--shadow); }
.privacy-grid, .no-log-policy-section, .risk-grid, .faq-grid, .related-grid, .check-grid { display: grid; gap: 16px; }
.privacy-card { padding: 20px; border-radius: 22px; background: #F8FAFF; border: 1px solid #E6EEFF; }
.no-log-policy-section .info-card { padding: 24px; }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { padding: 22px; position: relative; overflow: hidden; }
.step-number { width: 42px; height: 42px; border-radius: 16px; background: var(--blue); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-weight: 900; margin-bottom: 12px; }
.risk-card { padding: 22px; border-left: 4px solid var(--blue); }
.faq-item { padding: 22px; }
.faq-item h3 { font-size: 18px; }
.cta-section {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto 64px;
    padding: 44px 24px;
    text-align: center;
    color: #fff;
    border-radius: var(--radius-lg);
    background: var(--gradient);
    position: relative;
    overflow: hidden;
}
.cta-section p { color: rgba(255,255,255,.86); max-width: 680px; margin-left: auto; margin-right: auto; }
.page-hero { padding: 58px 0 28px; background: linear-gradient(180deg, #F6F9FF 0%, #FFFFFF 100%); }
.page-hero .content-container { display: grid; gap: 18px; }
.category-badge { display: inline-flex; width: fit-content; padding: 7px 14px; border-radius: 999px; color: var(--blue); background: #ECF4FF; font-weight: 800; font-size: 13px; }
.page-layout { display: grid; gap: 22px; padding: 34px 0 72px; }
.article-main { min-width: 0; }
.article-card { padding: 26px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow); margin-bottom: 20px; }
.side-panel { padding: 24px; background: #F8FAFF; border: 1px solid #E6EEFF; border-radius: var(--radius-md); align-self: start; }
.side-panel a { display: block; padding: 10px 0; color: var(--blue); font-weight: 700; }
.operation-list { display: grid; gap: 12px; padding: 0; margin: 20px 0 0; list-style: none; }
.operation-list li { padding: 14px 16px; background: #F8FAFF; border: 1px solid #E6EEFF; border-radius: 16px; color: #344054; }
.download-panel { text-align: center; padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.download-steps { display: grid; gap: 16px; margin: 26px 0; }
.download-step { padding: 20px; border-radius: 20px; background: #F8FAFF; border: 1px solid #E6EEFF; }
.safety-panel { padding: 24px; border-radius: var(--radius-md); background: #F6F9FF; border: 1px solid #E6EEFF; }
.site-footer { background: #101828; color: #fff; padding-top: 48px; }
.footer-inner { width: min(1180px, calc(100% - 32px)); margin: 0 auto; display: grid; gap: 30px; }
.footer-logo { width: 44px; height: 44px; border-radius: 14px; object-fit: cover; margin-bottom: 14px; }
.footer-brand p { color: rgba(255,255,255,.68); max-width: 420px; }
.footer-links { display: grid; gap: 24px; }
.footer-links h3 { font-size: 16px; color: #fff; }
.footer-links a { display: block; color: rgba(255,255,255,.68); margin: 8px 0; font-size: 14px; }
.footer-links a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.10); margin-top: 38px; padding: 20px 16px; text-align: center; }
.footer-bottom p { color: rgba(255,255,255,.58); margin: 0; font-size: 14px; }
@media (min-width: 680px) {
    .product-highlights, .privacy-grid, .no-log-policy-section, .risk-grid, .faq-grid, .related-grid, .check-grid, .download-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .hero-inner { padding: 58px 42px; }
    .bullet-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 980px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { font-size: 14px; }
    .hero-inner { grid-template-columns: 1.02fr .98fr; padding: 78px 64px; }
    .product-highlights { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .feature-split, .vpn-connection-section, .high-speed-section, .global-nodes-section, .multi-device-section, .encryption-protocol-section { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .privacy-protection-section { padding: 42px; }
    .privacy-grid, .no-log-policy-section { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 310px; align-items: start; }
    .footer-inner { grid-template-columns: .9fr 1.4fr; }
    .footer-links { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 1180px) {
    .hero-inner { padding: 86px 72px; }
    .section { padding: 86px 0; }
}