:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #202635;
    --muted: #667085;
    --soft: #F5F7FB;
    --soft-blue: #F1F6FF;
    --line: #E5EAF3;
    --card: #FFFFFF;
    --radius: 26px;
    --shadow: 0 18px 55px rgba(24, 44, 88, .10);
}
* { 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; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(229,234,243,.9);
}
.nav-shell {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand, .footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #111827;
    letter-spacing: .2px;
}
.logo { width: 40px; height: 40px; border-radius: 12px; object-fit: cover; }
.site-nav { display: none; align-items: center; gap: 2px; }
.site-nav a {
    padding: 10px 12px;
    color: #4B5563;
    font-size: 14px;
    border-radius: 999px;
    transition: .2s ease;
}
.site-nav a:hover, .site-nav a.active { color: var(--blue); background: #EEF5FF; }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 0 10px;
    cursor: pointer;
    background: #fff;
}
.nav-toggle-label span { display: block; height: 2px; background: #2B3445; border-radius: 2px; }
.nav-toggle:checked ~ .site-nav {
    display: flex;
    position: absolute;
    top: 72px;
    left: 14px;
    right: 14px;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
    padding: 10px;
}
.nav-toggle:checked ~ .site-nav a { padding: 12px 14px; }
.section { padding: 62px 0; }
.section.soft { background: var(--soft); }
.section-title { margin: 0 0 14px; font-size: clamp(28px, 5vw, 46px); line-height: 1.15; letter-spacing: -1px; }
.section-lead { margin: 0 0 28px; color: var(--muted); font-size: 16px; max-width: 760px; }
.kicker, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--blue);
    background: #EEF5FF;
    border: 1px solid #DDEAFF;
    border-radius: 999px;
    padding: 7px 12px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 16px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    background: var(--blue);
    color: #fff;
    border-radius: 999px;
    font-weight: 800;
    box-shadow: 0 14px 24px rgba(41,128,254,.22);
    transition: .2s ease;
    border: 0;
    white-space: nowrap;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-1px); }
.text-link { color: var(--blue); font-weight: 800; }
.text-link:hover { color: var(--blue-dark); }
.vpn-lab-hero {
    color: #fff;
    background: var(--gradient);
    padding: 58px 0 44px;
    position: relative;
    overflow: hidden;
}
.vpn-lab-hero:before, .vpn-lab-hero:after {
    content: "";
    position: absolute;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    background: rgba(255,255,255,.12);
    filter: blur(6px);
}
.vpn-lab-hero:before { top: -160px; left: -80px; }
.vpn-lab-hero:after { bottom: -180px; right: -90px; }
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-copy h1 { margin: 0 0 18px; font-size: clamp(36px, 9vw, 68px); line-height: 1.03; letter-spacing: -2px; }
.hero-copy p { margin: 0 0 24px; color: rgba(255,255,255,.86); font-size: 17px; max-width: 650px; }
.hero-tags, .floating-tags, .tag-row { display: flex; gap: 10px; flex-wrap: wrap; }
.hero-tags { margin-top: 22px; }
.hero-tags span, .floating-tags span, .tag-row span {
    border-radius: 999px;
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 700;
    border: 1px solid rgba(255,255,255,.22);
    background: rgba(255,255,255,.12);
}
.hero-visual {
    position: relative;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
    border-radius: 34px;
    padding: 18px;
    box-shadow: 0 28px 80px rgba(19, 32, 72, .25);
}
.hero-visual img { width: 100%; border-radius: 28px; background: rgba(255,255,255,.2); }
.status-card {
    background: rgba(255,255,255,.92);
    color: #202635;
    border-radius: 22px;
    padding: 14px 16px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,.7);
}
.status-card strong { display: block; color: #101828; }
.status-card small { color: #667085; }
.status-card.one { margin-top: 14px; }
.status-card.two { margin-top: 10px; }
.floating-tags { margin-top: 14px; }
.floating-tags span { background: rgba(255,255,255,.88); color: #2B3445; border-color: rgba(255,255,255,.75); }
.privacy-summary { margin-top: -28px; position: relative; z-index: 2; }
.summary-grid { display: grid; gap: 16px; }
.summary-card, .security-card, .info-card, .risk-card, .faq-item, .step-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 12px 34px rgba(15,23,42,.05);
}
.summary-card { padding: 24px; }
.summary-card span, .mini-label {
    display: inline-flex;
    color: var(--blue);
    background: #EEF5FF;
    border-radius: 999px;
    padding: 5px 10px;
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 10px;
}
.summary-card h3, .info-card h3, .risk-card h3, .step-card h3 { margin: 0 0 8px; font-size: 20px; }
.summary-card p, .info-card p, .risk-card p, .step-card p { margin: 0 0 12px; color: var(--muted); }
.split-section { display: grid; gap: 26px; align-items: center; }
.visual-card {
    border-radius: 34px;
    background: linear-gradient(145deg, #FFFFFF 0%, #F3F7FF 100%);
    border: 1px solid var(--line);
    padding: 18px;
    box-shadow: var(--shadow);
}
.visual-card img { border-radius: 26px; width: 100%; }
.point-list { display: grid; gap: 12px; margin: 22px 0; padding: 0; list-style: none; }
.point-list li {
    display: flex;
    gap: 10px;
    color: #3B4558;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 12px 14px;
}
.point-list li:before {
    content: "";
    width: 9px;
    height: 9px;
    margin-top: 9px;
    border-radius: 999px;
    background: var(--blue);
    flex: 0 0 auto;
}
.privacy-protection-section .security-card, .no-log-policy-section .security-card, .encryption-protocol-section .security-card {
    padding: 28px;
}
.security-card h3 { margin-top: 0; font-size: 23px; }
.security-card p { color: var(--muted); }
.panel-grid { display: grid; gap: 16px; margin-top: 22px; }
.info-card { padding: 22px; }
.info-card.highlight { background: linear-gradient(135deg, #FFFFFF 0%, #F1F6FF 100%); border-left: 4px solid var(--blue); }
.high-speed-section { background: var(--soft-blue); }
.multi-device-section .device-grid { display: grid; gap: 14px; margin-top: 18px; }
.device-tile { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 16px; }
.tech-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 24px;
    box-shadow: var(--shadow);
}
.protocol-row {
    display: grid;
    gap: 12px;
    margin: 0;
}
.protocol-row div {
    border: 1px solid var(--line);
    background: #F8FAFF;
    border-radius: 18px;
    padding: 16px;
}
.protocol-row dt { font-weight: 800; margin-bottom: 4px; }
.protocol-row dd { margin: 0; color: var(--muted); }
.process-steps { display: grid; gap: 14px; margin-top: 28px; }
.step-card { padding: 20px; position: relative; overflow: hidden; }
.step-number {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--blue);
    color: #fff;
    border-radius: 14px;
    font-weight: 900;
    margin-bottom: 12px;
}
.risk-grid { display: grid; gap: 14px; margin-top: 24px; }
.risk-card { padding: 20px; border-left: 4px solid var(--blue); }
.risk-card strong { display: block; margin: 8px 0 4px; }
.faq-list { display: grid; gap: 14px; margin-top: 22px; }
.faq-item { padding: 20px; }
.faq-item h3 { margin: 0 0 8px; font-size: 19px; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section {
    background: var(--gradient);
    color: #fff;
    text-align: center;
    border-radius: 34px;
    padding: 46px 22px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}
.cta-section p { color: rgba(255,255,255,.86); max-width: 680px; margin: 0 auto 24px; }
.page-hero {
    background: linear-gradient(135deg, #F4F7FF 0%, #FFFFFF 55%, #F8F2FF 100%);
    padding: 54px 0 34px;
    border-bottom: 1px solid var(--line);
}
.page-hero h1 { margin: 0 0 14px; font-size: clamp(32px, 7vw, 54px); line-height: 1.12; letter-spacing: -1.4px; }
.page-hero p { margin: 0; color: var(--muted); max-width: 780px; }
.content-layout { display: grid; gap: 24px; align-items: start; }
.content-main { display: grid; gap: 18px; }
.article-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 24px;
    box-shadow: 0 10px 34px rgba(15,23,42,.04);
}
.article-panel h2 { margin-top: 0; font-size: 24px; }
.article-panel p { color: #536072; }
.side-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 22px;
    box-shadow: var(--shadow);
}
.side-panel h2, .side-panel h3 { margin-top: 0; }
.check-list, .number-list { margin: 0; padding-left: 20px; color: #536072; }
.check-list li, .number-list li { margin: 10px 0; }
.note-box {
    background: #F7FAFF;
    border: 1px solid #DDEAFF;
    border-left: 4px solid var(--blue);
    border-radius: 20px;
    padding: 16px;
    color: #4B5563;
}
.download-panel { text-align: center; padding: 28px; }
.download-panel .download-btn { margin-top: 10px; }
.download-page .download-panel { margin-top: 12px; }
.site-footer {
    background: #F6F7FB;
    border-top: 1px solid var(--line);
    margin-top: 64px;
    color: #536072;
}
.footer-grid { display: grid; gap: 24px; padding: 42px 0; }
.footer-brand { color: #111827; margin-bottom: 12px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.site-footer h3 { color: #202635; margin: 0 0 12px; font-size: 16px; }
.site-footer a { display: block; color: #536072; margin: 8px 0; }
.site-footer a:hover { color: var(--blue); }
.footer-bottom { border-top: 1px solid var(--line); text-align: center; padding: 18px 14px; font-size: 13px; }
@media (min-width: 720px) {
    .summary-grid { grid-template-columns: repeat(3, 1fr); }
    .panel-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .multi-device-section .device-grid { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
}
@media (min-width: 960px) {
    .nav-toggle-label { display: none; }
    .site-nav { display: flex; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; }
    .vpn-lab-hero { padding: 86px 0 76px; }
    .status-card.one { position: absolute; left: -18px; top: 32px; margin: 0; max-width: 180px; }
    .status-card.two { position: absolute; right: -12px; bottom: 34px; margin: 0; max-width: 190px; }
    .split-section { grid-template-columns: 1fr 1fr; gap: 52px; }
    .split-section.reverse .visual-card { order: 2; }
    .split-section.reverse .split-copy { order: 1; }
    .content-layout { grid-template-columns: minmax(0, 1fr) 330px; gap: 28px; }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .section { padding: 82px 0; }
}
@media (max-width: 520px) {
    .container { width: min(100% - 24px, 1120px); }
    .download-btn { width: 100%; }
    .hero-copy .download-btn, .cta-section .download-btn, .download-panel .download-btn { width: auto; min-width: 180px; }
    .section { padding: 48px 0; }
    .article-panel, .security-card, .side-panel { padding: 20px; border-radius: 24px; }
}