* {
    box-sizing: border-box;
}
:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --line: #e5eaf3;
    --card: #ffffff;
    --shadow: 0 18px 45px rgba(30, 55, 120, 0.10);
}
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: #ffffff;
    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);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(16px);
}
.header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo,
.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: 0.02em;
    color: #111827;
}
.logo img,
.footer-brand img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}
.nav-toggle {
    display: none;
}
.nav-toggle-label {
    display: inline-flex;
    flex-direction: column;
    gap: 5px;
    padding: 9px;
    border: 1px solid var(--line);
    border-radius: 14px;
    cursor: pointer;
}
.nav-toggle-label span {
    width: 22px;
    height: 2px;
    background: #25314d;
    border-radius: 2px;
}
.main-nav {
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .main-nav {
    display: flex;
}
.main-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #344054;
    font-size: 15px;
}
.main-nav a:hover,
.main-nav a.active {
    color: var(--blue);
    background: #eef5ff;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #ffffff;
    font-weight: 700;
    box-shadow: 0 12px 24px rgba(41, 128, 254, 0.26);
    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 30px rgba(23, 104, 232, 0.28);
}
.section {
    padding: 64px 0;
}
.section-soft {
    background: var(--light);
}
.section-head {
    margin-bottom: 28px;
}
.section-head.center {
    text-align: center;
    max-width: 760px;
    margin-left: auto;
    margin-right: auto;
}
.eyebrow,
.category-badge,
.tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    color: var(--blue);
    background: #eef5ff;
    border: 1px solid #d7e7ff;
    font-size: 13px;
    font-weight: 700;
}
h1,
h2,
h3 {
    margin: 0 0 14px;
    line-height: 1.22;
    color: #101828;
}
h1 {
    font-size: clamp(34px, 7vw, 64px);
    letter-spacing: -0.05em;
}
h2 {
    font-size: clamp(26px, 4vw, 42px);
    letter-spacing: -0.035em;
}
h3 {
    font-size: 20px;
}
p {
    margin: 0 0 14px;
    color: var(--muted);
}
.vpn-lab-hero {
    position: relative;
    color: #ffffff;
    background: var(--gradient);
    overflow: hidden;
}
.vpn-lab-hero::before,
.vpn-lab-hero::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.16);
    filter: blur(2px);
}
.vpn-lab-hero::before {
    width: 240px;
    height: 240px;
    right: -70px;
    top: -60px;
}
.vpn-lab-hero::after {
    width: 180px;
    height: 180px;
    left: -55px;
    bottom: 40px;
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
    padding: 72px 0 82px;
}
.hero-copy h1,
.hero-copy p {
    color: #ffffff;
}
.hero-copy p {
    max-width: 650px;
    opacity: .92;
    font-size: 18px;
}
.hero-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    margin: 24px 0;
}
.hero-note {
    color: rgba(255, 255, 255, .86);
    font-size: 14px;
}
.hero-tags,
.status-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.hero-tags span,
.status-card,
.float-label {
    border: 1px solid rgba(255,255,255,.35);
    background: rgba(255,255,255,.13);
    color: #ffffff;
    border-radius: 999px;
    padding: 8px 12px;
    font-size: 13px;
}
.hero-visual {
    position: relative;
    min-height: 360px;
}
.hero-device {
    width: min(430px, 88%);
    margin: 0 auto;
    padding: 18px;
    border-radius: 34px;
    background: rgba(255, 255, 255, .22);
    border: 1px solid rgba(255, 255, 255, .36);
    box-shadow: 0 28px 70px rgba(20, 30, 90, .24);
}
.hero-device img {
    border-radius: 28px;
    background: #ffffff;
}
.float-label {
    position: absolute;
    background: rgba(255,255,255,.92);
    color: #25314d;
    border: 1px solid rgba(255,255,255,.6);
    box-shadow: 0 14px 30px rgba(20, 30, 90, .18);
    font-weight: 700;
}
.float-label.one { top: 22px; left: 0; }
.float-label.two { top: 76px; right: 6px; }
.float-label.three { bottom: 64px; left: 8px; }
.float-label.four { bottom: 12px; right: 28px; }
.privacy-summary {
    margin-top: -48px;
    position: relative;
    z-index: 3;
}
.summary-grid,
.card-grid,
.risk-grid,
.feature-list,
.page-card-grid {
    display: grid;
    gap: 18px;
}
.summary-card,
.security-card,
.risk-card,
.faq-item,
.info-panel,
.page-panel,
.step-card,
.tip-box,
.protocol-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 12px 32px rgba(31, 49, 95, 0.06);
}
.summary-card .tag {
    margin-bottom: 12px;
}
.summary-card a,
.text-link {
    color: var(--blue);
    font-weight: 700;
}
.two-col {
    display: grid;
    gap: 30px;
    align-items: center;
}
.two-col.reverse .visual-block {
    order: -1;
}
.visual-block {
    border-radius: 32px;
    background: #ffffff;
    border: 1px solid var(--line);
    padding: 18px;
    box-shadow: var(--shadow);
}
.visual-block img {
    border-radius: 24px;
    margin: 0 auto;
}
.point-list,
.clean-list {
    padding: 0;
    margin: 18px 0 0;
    list-style: none;
    display: grid;
    gap: 10px;
}
.point-list li,
.clean-list li {
    position: relative;
    padding-left: 26px;
    color: #475467;
}
.point-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--blue);
}
.privacy-protection-section .info-panel,
.encryption-protocol-section .info-panel {
    background: linear-gradient(180deg, #ffffff 0%, #f7faff 100%);
}
.no-log-policy-section .card-grid,
.encryption-protocol-section .card-grid {
    margin-top: 20px;
}
.high-speed-section {
    background: #f3f7ff;
}
.device-strip {
    display: grid;
    gap: 14px;
    margin-top: 20px;
}
.device-strip span {
    padding: 14px 16px;
    border-radius: 18px;
    background: #f4f7fb;
    color: #344054;
    font-weight: 700;
}
.process-steps {
    display: grid;
    gap: 16px;
    counter-reset: steps;
}
.step-card {
    position: relative;
    padding-top: 54px;
}
.step-card::before {
    counter-increment: steps;
    content: counter(steps, decimal-leading-zero);
    position: absolute;
    top: 18px;
    left: 22px;
    color: var(--blue);
    font-weight: 900;
    letter-spacing: .08em;
}
.risk-card {
    border-top: 4px solid var(--blue);
}
.risk-card strong {
    display: block;
    margin: 10px 0 5px;
    color: #111827;
}
.faq-list {
    display: grid;
    gap: 14px;
}
.faq-item h3 {
    font-size: 18px;
}
.cta-section {
    padding: 70px 0;
    background: var(--gradient);
    color: #ffffff;
    text-align: center;
}
.cta-section h2,
.cta-section p {
    color: #ffffff;
}
.cta-section p {
    max-width: 680px;
    margin: 0 auto 24px;
    opacity: .9;
}
.page-hero {
    padding: 62px 0 46px;
    background: linear-gradient(180deg, #f6f8ff 0%, #ffffff 100%);
}
.page-hero .container {
    max-width: 920px;
}
.page-hero p {
    font-size: 18px;
}
.page-layout {
    display: grid;
    gap: 22px;
    align-items: start;
}
.article-body {
    display: grid;
    gap: 22px;
}
.article-body .page-panel h2 {
    font-size: 26px;
}
.sidebar {
    display: grid;
    gap: 16px;
}
.side-card {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 20px;
    box-shadow: 0 10px 26px rgba(31, 49, 95, .05);
}
.side-card a {
    display: block;
    color: var(--blue);
    font-weight: 700;
    margin-top: 8px;
}
.download-focus {
    max-width: 880px;
    margin: 0 auto;
    text-align: center;
}
.download-steps {
    display: grid;
    gap: 16px;
    margin-top: 30px;
    text-align: left;
}
.number-item {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 14px;
    align-items: start;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #ffffff;
}
.number-item span {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: #eef5ff;
    color: var(--blue);
    font-weight: 900;
}
.site-footer {
    background: #101828;
    color: #d0d5dd;
    padding: 48px 0 24px;
}
.site-footer p,
.site-footer a,
.footer-bottom span {
    color: #aab3c2;
}
.footer-grid {
    display: grid;
    gap: 26px;
}
.site-footer h3 {
    color: #ffffff;
    font-size: 16px;
}
.site-footer a {
    display: block;
    margin: 8px 0;
}
.footer-brand {
    color: #ffffff;
    margin-bottom: 12px;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.12);
    margin-top: 28px;
    padding-top: 20px;
    font-size: 14px;
}
@media (min-width: 720px) {
    .summary-grid,
    .card-grid,
    .page-card-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .risk-grid,
    .download-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    .device-strip {
        grid-template-columns: repeat(3, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
    }
}
@media (min-width: 940px) {
    .nav-toggle-label {
        display: none;
    }
    .main-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .main-nav a {
        font-size: 14px;
        padding: 8px 10px;
    }
    .hero-grid {
        grid-template-columns: 1.08fr .92fr;
    }
    .two-col,
    .page-layout {
        grid-template-columns: 1.05fr .95fr;
    }
    .two-col.reverse .visual-block {
        order: 2;
    }
    .privacy-protection-section .two-col,
    .encryption-protocol-section .two-col {
        grid-template-columns: .8fr 1.2fr;
    }
    .risk-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .process-steps {
        grid-template-columns: repeat(3, 1fr);
    }
    .page-layout {
        grid-template-columns: minmax(0, 1fr) 310px;
    }
    .section {
        padding: 84px 0;
    }
}
@media (max-width: 520px) {
    .container {
        width: min(100% - 24px, 1120px);
    }
    .hero-grid {
        padding: 52px 0 70px;
    }
    .hero-visual {
        min-height: 310px;
    }
    .float-label {
        position: static;
        display: inline-flex;
        margin: 8px 6px 0 0;
    }
    .hero-device {
        width: 100%;
    }
    .download-btn {
        width: 100%;
    }
    .summary-card,
    .security-card,
    .risk-card,
    .faq-item,
    .info-panel,
    .page-panel,
    .step-card,
    .tip-box,
    .protocol-card {
        padding: 20px;
        border-radius: 20px;
    }
}