:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #657083;
    --light: #f5f7fb;
    --line: #e5e9f2;
    --panel: #ffffff;
    --soft-blue: #edf4ff;
    --shadow: 0 18px 45px rgba(45, 74, 150, 0.12);
    --radius: 26px;
}
* { 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: 1.72;
    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: #f7f9fd; }
.section-title { max-width: 760px; margin-bottom: 28px; }
.section-title.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 13px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--blue);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 14px;
}
h1, h2, h3 { line-height: 1.22; margin: 0 0 14px; }
h1 { font-size: clamp(34px, 8vw, 62px); letter-spacing: -1.8px; }
h2 { font-size: clamp(26px, 5vw, 42px); letter-spacing: -1px; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
ul, ol { padding-left: 20px; color: var(--muted); }
.text-link { color: var(--blue); font-weight: 700; border-bottom: 1px solid rgba(41,128,254,.28); }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 26px 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 18px 34px rgba(23,104,232,.3); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(229,233,242,.9);
}
.header-inner {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo, .footer-logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; font-size: 20px; }
.logo img, .footer-logo img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.nav-toggle { display: none; }
.nav-toggle-label {
    display: inline-flex;
    padding: 8px 13px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--text);
    font-weight: 700;
}
.site-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 72px;
    display: none;
    flex-direction: column;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav { display: flex; }
.site-nav a {
    padding: 11px 12px;
    border-radius: 14px;
    color: #4b5563;
    font-size: 15px;
    font-weight: 700;
}
.site-nav a:hover, .site-nav a.active { color: var(--blue); background: var(--soft-blue); }
.vpn-lab-hero {
    position: relative;
    overflow: hidden;
    background: var(--gradient);
    color: #fff;
    padding: 64px 0 42px;
}
.vpn-lab-hero::before, .cta-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 18% 10%, rgba(255,255,255,.22), transparent 28%), radial-gradient(circle at 85% 25%, rgba(255,255,255,.18), transparent 24%);
    pointer-events: none;
}
.hero-grid {
    position: relative;
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-copy p { color: rgba(255,255,255,.86); font-size: 17px; max-width: 680px; }
.hero-tags { display: flex; gap: 10px; flex-wrap: wrap; margin: 22px 0 24px; }
.hero-tags span, .status-chip {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
    color: #fff;
    font-weight: 700;
    font-size: 13px;
}
.hero-visual { position: relative; min-height: 300px; }
.hero-device {
    position: relative;
    padding: 18px;
    border-radius: 34px;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.28);
    box-shadow: 0 28px 70px rgba(26, 31, 70, .28);
}
.hero-device img { border-radius: 26px; background: #fff; }
.float-card {
    position: absolute;
    display: none;
    padding: 12px 14px;
    border-radius: 18px;
    color: #172033;
    background: rgba(255,255,255,.94);
    box-shadow: var(--shadow);
    font-size: 13px;
    font-weight: 800;
}
.float-card small { display: block; color: var(--muted); font-weight: 600; }
.float-card.one { left: -18px; top: 18%; }
.float-card.two { right: -10px; top: 12%; }
.float-card.three { left: 8%; bottom: -14px; }
.float-card.four { right: 4%; bottom: 12%; }
.privacy-summary { margin-top: -34px; position: relative; z-index: 5; }
.summary-grid, .card-grid, .risk-grid, .faq-grid, .policy-grid { display: grid; gap: 16px; }
.summary-card, .security-card, .risk-card, .faq-item, .policy-card, .step-card, .side-panel, .note-panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 12px 32px rgba(41, 59, 110, .06);
}
.summary-card .tag { color: var(--blue); font-size: 13px; font-weight: 900; }
.module-grid {
    display: grid;
    gap: 28px;
    align-items: center;
}
.module-image {
    border-radius: 32px;
    padding: 16px;
    background: linear-gradient(135deg, #eef4ff, #fff);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.module-image img { border-radius: 24px; }
.feature-list { display: grid; gap: 12px; margin: 20px 0; }
.feature-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 14px;
    border-radius: 18px;
    background: #f8faff;
    border: 1px solid #edf1f8;
}
.feature-dot { width: 10px; height: 10px; border-radius: 999px; background: var(--blue); margin-top: 8px; flex: 0 0 auto; }
.privacy-protection-section { background: linear-gradient(180deg, #fff 0%, #f8faff 100%); }
.boundary-panel {
    border-radius: 34px;
    padding: 26px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.boundary-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.boundary-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    color: var(--blue);
    background: var(--soft-blue);
    font-weight: 800;
    font-size: 13px;
}
.no-log-policy-section .policy-card { border-top: 4px solid var(--blue); }
.high-speed-section { background: #f6f9ff; }
.protocol-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 34px;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.protocol-row {
    display: grid;
    gap: 12px;
    padding: 18px 22px;
    border-bottom: 1px solid var(--line);
}
.protocol-row:last-child { border-bottom: 0; }
.protocol-code {
    display: inline-flex;
    width: fit-content;
    border-radius: 999px;
    padding: 6px 10px;
    background: var(--soft-blue);
    color: var(--blue);
    font-weight: 900;
    font-size: 13px;
}
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding-left: 68px; }
.step-card::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 22px;
    top: 24px;
    width: 32px;
    height: 32px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    background: var(--blue);
    color: #fff;
    font-weight: 900;
}
.risk-card { border-left: 4px solid var(--blue); }
.risk-card strong { display: block; margin-bottom: 6px; }
.faq-item h3 { font-size: 18px; }
.cta-section {
    position: relative;
    overflow: hidden;
    color: #fff;
    text-align: center;
    background: var(--gradient);
    border-radius: 36px;
    padding: 46px 22px;
}
.cta-section > * { position: relative; }
.cta-section p { color: rgba(255,255,255,.86); max-width: 720px; margin-left: auto; margin-right: auto; }
.page-hero {
    padding: 56px 0 30px;
    background: linear-gradient(180deg, #f6f8ff 0%, #fff 100%);
}
.page-hero .container { max-width: 940px; }
.page-layout { display: grid; gap: 26px; align-items: start; }
.article-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 26px;
    box-shadow: 0 12px 34px rgba(50, 70, 140, .06);
}
.article-card h2 { font-size: 26px; margin-top: 10px; }
.info-list { display: grid; gap: 12px; padding: 0; margin: 18px 0; list-style: none; }
.info-list li {
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #f9fbff;
    color: var(--muted);
}
.side-panel { position: static; }
.side-panel a { display: block; color: var(--blue); font-weight: 800; padding: 8px 0; }
.download-single { margin-top: 22px; }
.download-card {
    text-align: center;
    padding: 34px;
    border-radius: 32px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.download-steps { display: grid; gap: 14px; margin-top: 24px; }
.download-step {
    display: flex;
    gap: 14px;
    text-align: left;
    padding: 16px;
    border-radius: 20px;
    background: #f9fbff;
    border: 1px solid var(--line);
}
.download-step span {
    width: 30px;
    height: 30px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    background: var(--blue);
    color: #fff;
    font-weight: 900;
    flex: 0 0 auto;
}
.faq-list { display: grid; gap: 14px; }
.faq-block {
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #fff;
    padding: 20px;
}
.faq-block h2 { font-size: 21px; margin-bottom: 8px; }
.site-footer { background: #101828; color: #fff; padding: 46px 0 0; }
.site-footer p { color: rgba(255,255,255,.66); }
.footer-grid { display: grid; gap: 26px; }
.site-footer h3 { color: #fff; font-size: 16px; }
.site-footer a { display: block; color: rgba(255,255,255,.72); margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 32px; border-top: 1px solid rgba(255,255,255,.1); color: rgba(255,255,255,.62); text-align: center; padding: 18px; font-size: 14px; }
@media (min-width: 720px) {
    .section { padding: 82px 0; }
    .summary-grid { grid-template-columns: repeat(3, 1fr); }
    .card-grid, .policy-grid, .faq-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .download-steps { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.35fr 1fr 1fr 1fr; }
}
@media (min-width: 920px) {
    .nav-toggle-label { display: none; }
    .site-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { padding: 9px 11px; font-size: 14px; }
    .vpn-lab-hero { padding: 86px 0 82px; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; }
    .float-card { display: block; }
    .module-grid { grid-template-columns: 1fr 1fr; }
    .module-grid.reverse .module-image { order: 2; }
    .privacy-protection-section .module-grid { grid-template-columns: .9fr 1.1fr; }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 310px; }
    .side-panel { position: sticky; top: 96px; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1120px); }
    .summary-card, .security-card, .risk-card, .faq-item, .policy-card, .step-card, .side-panel, .article-card { padding: 20px; border-radius: 22px; }
    .download-btn { width: 100%; }
    .hero-copy .download-btn, .cta-section .download-btn, .download-card .download-btn { width: 100%; }
}