* {
    box-sizing: border-box;
}

:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #202637;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E6EAF2;
    --panel: #FFFFFF;
    --soft-blue: #EEF5FF;
    --radius: 24px;
    --shadow: 0 18px 45px rgba(20, 38, 78, 0.09);
}

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;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

p {
    margin: 0 0 14px;
    color: var(--muted);
}

h1, h2, h3 {
    margin: 0;
    line-height: 1.25;
    color: var(--text);
}

ul, ol {
    margin: 0;
    padding-left: 20px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid rgba(230, 234, 242, 0.9);
    backdrop-filter: blur(16px);
}

.header-inner {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #15213A;
    white-space: nowrap;
}

.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: 10px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: #fff;
    cursor: pointer;
}

.nav-toggle-label span {
    width: 22px;
    height: 2px;
    background: #26344F;
    border-radius: 99px;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
}

.nav-toggle:checked ~ .site-nav {
    display: flex;
}

.site-nav a {
    color: #40506B;
    font-size: 15px;
    padding: 10px 12px;
    border-radius: 14px;
}

.site-nav a.active,
.site-nav a:hover {
    color: var(--blue);
    background: var(--soft-blue);
}

.nav-download {
    font-weight: 700;
}

.content-container,
.section-inner,
.page-container {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
}

.vpn-lab-hero {
    background: var(--gradient);
    color: #fff;
    padding: 54px 0 42px;
    position: relative;
    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(4px);
}

.vpn-lab-hero::before {
    width: 220px;
    height: 220px;
    right: -70px;
    top: 30px;
}

.vpn-lab-hero::after {
    width: 160px;
    height: 160px;
    left: -60px;
    bottom: 20px;
}

.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
}

.hero-copy h1 {
    color: #fff;
    font-size: clamp(34px, 8vw, 64px);
    letter-spacing: -0.04em;
    margin-bottom: 18px;
}

.hero-copy p {
    color: rgba(255, 255, 255, 0.86);
    font-size: 17px;
    max-width: 620px;
}

.hero-tags,
.status-tags,
.badge-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.hero-tags span,
.status-tags span,
.badge-row span,
.category-badge {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 7px 12px;
    font-size: 13px;
    font-weight: 700;
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.hero-visual {
    position: relative;
    padding: 20px;
}

.hero-device-card {
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 34px;
    padding: 20px;
    box-shadow: 0 30px 60px rgba(22, 35, 95, 0.2);
    backdrop-filter: blur(18px);
}

.hero-device-card img {
    border-radius: 26px;
    margin: 0 auto;
}

.float-card {
    position: static;
    margin-top: 10px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #1B2A45;
    background: #fff;
    border-radius: 16px;
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(17, 31, 75, 0.14);
}

.float-card::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--blue);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    border: 0;
    box-shadow: 0 12px 24px rgba(41, 128, 254, 0.28);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
    margin-top: 20px;
}

.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 16px 30px rgba(23, 104, 232, 0.32);
}

.section {
    padding: 58px 0;
}

.section.soft {
    background: var(--light);
}

.section-heading {
    margin-bottom: 26px;
}

.section-heading .eyebrow,
.eyebrow {
    display: inline-flex;
    color: var(--blue);
    background: var(--soft-blue);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 12px;
}

.section-heading h2 {
    font-size: clamp(26px, 5vw, 42px);
    margin-bottom: 10px;
    letter-spacing: -0.03em;
}

.section-heading p {
    max-width: 760px;
}

.privacy-summary {
    margin-top: -22px;
    position: relative;
    z-index: 2;
}

.summary-grid,
.info-grid,
.risk-grid,
.faq-grid,
.point-grid {
    display: grid;
    gap: 16px;
}

.summary-card,
.info-card,
.security-card,
.risk-card,
.faq-item,
.step-card,
.notice-panel,
.side-panel,
.download-panel,
.policy-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 14px 34px rgba(29, 46, 92, 0.06);
}

.summary-card .label,
.info-card .label,
.security-card .label,
.risk-card .label {
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
    margin-bottom: 8px;
}

.summary-card h3,
.info-card h3,
.security-card h3,
.risk-card h3,
.step-card h3,
.policy-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.text-link {
    color: var(--blue);
    font-weight: 800;
}

.text-link:hover {
    color: var(--blue-dark);
}

.split-section,
.feature-layout {
    display: grid;
    gap: 26px;
    align-items: center;
}

.feature-image,
.lab-panel {
    background: linear-gradient(180deg, #FFFFFF 0%, #F2F6FF 100%);
    border: 1px solid var(--line);
    border-radius: 32px;
    padding: 22px;
    box-shadow: var(--shadow);
}

.feature-image img {
    border-radius: 24px;
    margin: 0 auto;
}

.feature-copy h2 {
    font-size: clamp(26px, 5vw, 42px);
    margin-bottom: 14px;
    letter-spacing: -0.03em;
}

.feature-copy .lead {
    font-size: 17px;
}

.feature-list {
    display: grid;
    gap: 10px;
    margin: 20px 0;
    padding: 0;
    list-style: none;
}

.feature-list li {
    display: flex;
    gap: 10px;
    color: #40506B;
}

.feature-list li::before {
    content: "";
    width: 8px;
    height: 8px;
    margin-top: 10px;
    border-radius: 50%;
    background: var(--blue);
    flex: 0 0 auto;
}

.privacy-protection-section .notice-panel,
.encryption-protocol-section .notice-panel {
    border-left: 5px solid var(--blue);
}

.no-log-policy-section .point-grid,
.encryption-protocol-section .point-grid {
    margin-top: 18px;
}

.high-speed-section {
    background: linear-gradient(180deg, #F6F9FF 0%, #FFFFFF 100%);
}

.device-stack {
    display: grid;
    gap: 14px;
}

.device-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 18px;
}

.device-card strong {
    color: #1D2B49;
}

.process-steps {
    display: grid;
    gap: 16px;
    counter-reset: steps;
}

.step-card {
    position: relative;
    padding-left: 74px;
}

.step-card .step-num {
    position: absolute;
    left: 20px;
    top: 22px;
    width: 38px;
    height: 38px;
    border-radius: 14px;
    background: var(--blue);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
}

.risk-card {
    border-top: 4px solid var(--blue);
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.cta-section {
    padding: 62px 0;
    background: var(--gradient);
    color: #fff;
    text-align: center;
}

.cta-section h2 {
    color: #fff;
    font-size: clamp(28px, 6vw, 46px);
    margin-bottom: 10px;
}

.cta-section p {
    color: rgba(255,255,255,0.86);
    max-width: 680px;
    margin: 0 auto;
}

.page-hero {
    padding: 52px 0 34px;
    background: linear-gradient(180deg, #F4F7FF 0%, #FFFFFF 100%);
}

.page-hero-inner {
    width: min(980px, calc(100% - 32px));
    margin: 0 auto;
}

.category-badge {
    background: var(--soft-blue);
    border-color: #D7E7FF;
    color: var(--blue);
    margin-bottom: 14px;
}

.page-hero h1 {
    font-size: clamp(32px, 7vw, 54px);
    letter-spacing: -0.04em;
    margin-bottom: 14px;
}

.page-hero p {
    font-size: 17px;
    max-width: 760px;
}

.page-content {
    padding: 42px 0 64px;
}

.content-layout {
    width: min(1080px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 22px;
}

.article-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    box-shadow: 0 16px 36px rgba(28, 45, 87, 0.06);
}

.article-panel h2 {
    font-size: 26px;
    margin: 20px 0 10px;
}

.article-panel h2:first-child {
    margin-top: 0;
}

.article-panel h3 {
    margin-bottom: 8px;
}

.check-list {
    display: grid;
    gap: 12px;
    padding: 0;
    margin: 20px 0;
    list-style: none;
}

.check-list li {
    background: var(--light);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 14px 16px;
    color: #45546E;
}

.side-panel {
    position: relative;
}

.side-panel h2,
.side-panel h3 {
    margin-bottom: 10px;
}

.side-panel .mini-links {
    display: grid;
    gap: 10px;
    margin-top: 16px;
}

.side-panel .mini-links a {
    padding: 11px 13px;
    background: var(--light);
    border: 1px solid var(--line);
    border-radius: 14px;
    color: #40506B;
    font-weight: 700;
}

.side-panel .mini-links a:hover {
    color: var(--blue);
    background: var(--soft-blue);
}

.download-panel {
    background: linear-gradient(180deg, #FFFFFF 0%, #F3F7FF 100%);
    text-align: left;
}

.download-panel.center {
    text-align: center;
}

.table-like {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.table-like div {
    display: grid;
    gap: 6px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
}

.table-like strong {
    color: #1D2B49;
}

.site-footer {
    background: #101828;
    color: #fff;
    padding: 44px 0 20px;
}

.footer-inner {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 28px;
}

.footer-brand {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.footer-brand img {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    object-fit: cover;
}

.footer-brand p,
.footer-bottom {
    color: rgba(255,255,255,0.68);
}

.footer-links {
    display: grid;
    gap: 20px;
}

.footer-links h3 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 10px;
}

.footer-links a {
    display: block;
    color: rgba(255,255,255,0.72);
    margin: 8px 0;
    font-size: 14px;
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    width: min(1160px, calc(100% - 32px));
    margin: 28px auto 0;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 14px;
}

@media (min-width: 720px) {
    .summary-grid,
    .faq-grid,
    .point-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .risk-grid,
    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 980px) {
    .nav-toggle-label {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }

    .hero-grid,
    .split-section,
    .feature-layout {
        grid-template-columns: 1.06fr 0.94fr;
    }

    .feature-layout.reverse,
    .split-section.reverse {
        grid-template-columns: 0.94fr 1.06fr;
    }

    .float-card {
        position: absolute;
        margin-top: 0;
    }

    .float-card.one {
        top: 18px;
        left: 0;
    }

    .float-card.two {
        right: 0;
        top: 42%;
    }

    .float-card.three {
        left: 8%;
        bottom: 22px;
    }

    .float-card.four {
        right: 10%;
        bottom: 8px;
    }

    .content-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
        align-items: start;
    }

    .side-panel {
        position: sticky;
        top: 98px;
    }

    .risk-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .footer-inner {
        grid-template-columns: 1fr 1.35fr;
    }
}

@media (max-width: 420px) {
    .content-container,
    .section-inner,
    .page-container,
    .content-layout,
    .page-hero-inner,
    .footer-inner,
    .footer-bottom {
        width: min(100% - 24px, 1160px);
    }

    .article-panel,
    .summary-card,
    .info-card,
    .security-card,
    .risk-card,
    .faq-item,
    .step-card,
    .notice-panel,
    .side-panel,
    .download-panel,
    .policy-card {
        padding: 18px;
        border-radius: 20px;
    }

    .step-card {
        padding-left: 64px;
    }

    .download-btn {
        width: 100%;
    }
}