* {
    box-sizing: border-box;
}
:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #263142;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E6EAF2;
    --panel: #FFFFFF;
    --soft-blue: #F0F6FF;
    --shadow: 0 18px 50px rgba(42, 64, 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: #fff;
    line-height: 1.75;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    display: block;
}
.content-container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}
.site-header,
header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
}
.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 800;
    color: #1A2540;
    white-space: nowrap;
}
.logo img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}
.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}
.mobile-nav {
    display: inline-flex;
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    color: var(--text);
    font-weight: 700;
    cursor: pointer;
    background: #fff;
}
.responsive-nav,
.desktop-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 8px;
    padding: 14px 0 18px;
}
.responsive-nav a,
.desktop-nav a {
    padding: 10px 12px;
    border-radius: 999px;
    color: #42526B;
    font-weight: 650;
    font-size: 14px;
}
.responsive-nav a.active,
.responsive-nav a:hover,
.desktop-nav a.active,
.desktop-nav a:hover {
    color: var(--blue);
    background: var(--soft-blue);
}
.nav-toggle:checked ~ .responsive-nav {
    display: flex;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    background: var(--blue);
    color: #fff;
    border-radius: 999px;
    font-weight: 800;
    letter-spacing: 0.02em;
    box-shadow: 0 12px 28px rgba(41, 128, 254, 0.24);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}
.download-btn:hover {
    background: var(--blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(23, 104, 232, 0.26);
}
.gradient-background {
    background: var(--gradient);
}
.vpn-lab-hero {
    background: var(--gradient);
    color: #fff;
    padding: 56px 0 68px;
    position: relative;
    overflow: hidden;
}
.vpn-lab-hero::before,
.vpn-lab-hero::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    filter: blur(2px);
}
.vpn-lab-hero::before {
    width: 280px;
    height: 280px;
    right: -90px;
    top: -90px;
}
.vpn-lab-hero::after {
    width: 190px;
    height: 190px;
    left: -80px;
    bottom: -60px;
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-kicker,
.category-badge,
.label-pill {
    display: inline-flex;
    align-items: center;
    width: max-content;
    max-width: 100%;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    color: #fff;
    font-size: 13px;
    font-weight: 750;
    border: 1px solid rgba(255,255,255,0.25);
}
.page-hero .category-badge,
.section-kicker,
.card-tag {
    background: var(--soft-blue);
    color: var(--blue);
    border: 1px solid #D7E8FF;
}
.hero-copy h1,
.page-hero h1 {
    margin: 18px 0 16px;
    font-size: clamp(34px, 8vw, 66px);
    line-height: 1.08;
    letter-spacing: -0.045em;
}
.hero-copy p,
.page-hero p {
    margin: 0 0 24px;
    color: rgba(255,255,255,0.88);
    font-size: 17px;
    max-width: 650px;
}
.hero-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}
.hero-tags span,
.inline-tags span {
    border-radius: 999px;
    padding: 8px 12px;
    background: rgba(255,255,255,0.14);
    border: 1px solid rgba(255,255,255,0.22);
    font-size: 13px;
    font-weight: 700;
}
.lab-visual {
    position: relative;
    min-height: 360px;
    display: grid;
    place-items: center;
}
.lab-device {
    width: min(430px, 92%);
    border-radius: 32px;
    padding: 16px;
    background: rgba(255,255,255,0.18);
    box-shadow: 0 28px 80px rgba(20, 26, 80, 0.26);
    backdrop-filter: blur(14px);
}
.lab-device img {
    border-radius: 24px;
    margin: 0 auto;
}
.float-card {
    position: absolute;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 18px;
    background: rgba(255,255,255,0.94);
    color: #1E2B45;
    box-shadow: 0 18px 40px rgba(24, 31, 90, 0.16);
    font-size: 13px;
    font-weight: 800;
}
.float-card::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--blue);
}
.float-one { top: 18px; left: 12px; }
.float-two { top: 72px; right: 0; }
.float-three { bottom: 56px; left: 0; }
.float-four { bottom: 8px; right: 30px; }
section {
    padding: 58px 0;
}
.section-head {
    max-width: 780px;
    margin-bottom: 28px;
}
.section-head.center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}
.section-kicker,
.card-tag {
    display: inline-flex;
    padding: 5px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 12px;
}
.section-head h2,
.panel-copy h2,
.content-card h2,
.page-body h2 {
    margin: 0 0 12px;
    font-size: clamp(26px, 4vw, 42px);
    line-height: 1.18;
    letter-spacing: -0.035em;
}
.section-head p,
.panel-copy p,
.content-card p,
.page-body p,
.faq-item p {
    color: var(--muted);
    margin: 0 0 14px;
}
.privacy-summary {
    margin-top: -34px;
    position: relative;
    z-index: 4;
    padding-top: 0;
}
.summary-grid,
.security-card-grid,
.card-grid,
.risk-grid,
.faq-grid {
    display: grid;
    gap: 18px;
}
.security-card,
.summary-card,
.feature-card,
.risk-card,
.faq-item,
.tip-card,
.step-card,
.content-card,
.info-panel,
.checklist,
.side-panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    box-shadow: var(--shadow);
}
.summary-card {
    min-height: 178px;
}
.summary-card h3,
.security-card h3,
.feature-card h3,
.risk-card h3,
.step-card h3,
.tip-card h3,
.side-panel h3,
.faq-item h3 {
    margin: 0 0 10px;
    font-size: 19px;
    line-height: 1.35;
}
.summary-card p,
.security-card p,
.feature-card p,
.risk-card p,
.step-card p,
.tip-card p,
.side-panel p {
    margin: 0 0 14px;
    color: var(--muted);
}
.text-link {
    color: var(--blue);
    font-weight: 800;
}
.text-link:hover {
    color: var(--blue-dark);
}
.vpn-connection-section,
.global-nodes-section,
.multi-device-section {
    background: #fff;
}
.high-speed-section,
.no-log-policy-section,
.encryption-protocol-section,
.page-muted {
    background: var(--light);
}
.lab-section-grid,
.split-grid,
.page-grid {
    display: grid;
    gap: 28px;
    align-items: center;
}
.panel-visual {
    border-radius: 32px;
    background: linear-gradient(145deg, #F7FAFF, #FFFFFF);
    border: 1px solid var(--line);
    padding: 22px;
    box-shadow: var(--shadow);
}
.panel-visual img {
    margin: 0 auto;
    border-radius: 24px;
}
.feature-list,
.clean-list {
    padding: 0;
    list-style: none;
    margin: 18px 0;
    display: grid;
    gap: 10px;
}
.feature-list li,
.clean-list li {
    position: relative;
    padding-left: 26px;
    color: #435069;
}
.feature-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 12px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--blue);
}
.safety-panel {
    border-radius: 30px;
    background: #fff;
    border: 1px solid var(--line);
    padding: 26px;
    box-shadow: var(--shadow);
}
.safety-panel .panel-row {
    display: grid;
    gap: 16px;
}
.no-log-row,
.protocol-row {
    display: grid;
    gap: 18px;
}
.process-steps {
    display: grid;
    gap: 14px;
}
.step-card {
    position: relative;
    overflow: hidden;
}
.step-number {
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--blue);
    color: #fff;
    font-weight: 900;
    margin-bottom: 12px;
}
.risk-grid {
    grid-template-columns: 1fr;
}
.risk-card {
    border-left: 4px solid var(--blue);
    box-shadow: none;
}
.risk-card strong {
    display: block;
    color: #1E2B45;
    margin-top: 8px;
}
.faq-item {
    box-shadow: none;
}
.cta-section {
    color: #fff;
    background: var(--gradient);
    text-align: center;
    padding: 58px 0;
}
.cta-box {
    max-width: 760px;
    margin: 0 auto;
}
.cta-box h2 {
    font-size: clamp(28px, 5vw, 46px);
    line-height: 1.18;
    margin: 0 0 14px;
    letter-spacing: -0.035em;
}
.cta-box p {
    color: rgba(255,255,255,0.88);
    margin: 0 0 24px;
}
.page-hero {
    padding: 56px 0 34px;
    background: var(--gradient);
    color: #fff;
}
.page-hero p {
    color: rgba(255,255,255,0.88);
}
.page-section {
    padding: 44px 0 64px;
}
.page-body {
    min-width: 0;
}
.page-body .lead {
    font-size: 18px;
    color: #4A556A;
}
.article-block {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 12px 38px rgba(42,64,120,0.07);
}
.article-block h2 {
    font-size: 25px;
}
.side-panel {
    align-self: start;
    position: relative;
}
.side-panel a {
    display: block;
    color: var(--blue);
    font-weight: 800;
    margin-top: 10px;
}
.download-area {
    margin-top: 26px;
}
.download-only-panel {
    max-width: 860px;
    margin: 0 auto;
    text-align: center;
}
.download-steps {
    display: grid;
    gap: 14px;
    margin: 26px 0;
    text-align: left;
}
.download-step {
    padding: 18px;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: #fff;
}
.site-footer,
footer {
    background: #111827;
    color: #E5E7EB;
    padding: 46px 0 22px;
}
.footer-grid {
    display: grid;
    gap: 24px;
}
.footer-brand {
    font-size: 22px;
    font-weight: 900;
    margin-bottom: 10px;
}
.footer p {
    color: #B9C1D0;
    margin: 0;
}
.footer h3 {
    font-size: 15px;
    margin: 0 0 12px;
    color: #fff;
}
.footer a {
    display: block;
    color: #B9C1D0;
    margin: 8px 0;
}
.footer a:hover {
    color: #fff;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.12);
    margin-top: 28px;
    padding-top: 18px;
    font-size: 14px;
}
@media (min-width: 640px) {
    .summary-grid,
    .security-card-grid,
    .card-grid,
    .faq-grid,
    .download-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .risk-grid,
    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}
@media (min-width: 860px) {
    .mobile-nav {
        display: none;
    }
    .responsive-nav,
    .desktop-nav {
        display: flex;
        width: auto;
        flex-direction: row;
        align-items: center;
        padding: 0;
        gap: 4px;
    }
    .hero-grid,
    .lab-section-grid,
    .split-grid,
    .page-grid {
        grid-template-columns: 1.05fr 0.95fr;
    }
    .page-grid {
        grid-template-columns: minmax(0, 1fr) 320px;
        align-items: start;
    }
    .summary-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .security-card-grid,
    .card-grid,
    .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .footer-grid {
        grid-template-columns: 1.6fr repeat(3, 1fr);
    }
    section {
        padding: 78px 0;
    }
    .vpn-lab-hero {
        padding: 82px 0 104px;
    }
    .privacy-summary {
        margin-top: -54px;
    }
    .safety-panel .panel-row,
    .no-log-row,
    .protocol-row {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}
@media (min-width: 1120px) {
    .hero-copy h1 {
        font-size: 68px;
    }
    .lab-visual {
        min-height: 470px;
    }
}
@media (max-width: 859px) {
    .header-inner {
        flex-wrap: wrap;
    }
    .hero-copy .download-btn,
    .cta-box .download-btn,
    .download-area .download-btn,
    .download-only-panel .download-btn {
        width: 100%;
    }
    .float-card {
        position: static;
        margin: 8px;
    }
    .lab-visual {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        min-height: auto;
    }
    .lab-device {
        order: -1;
        width: 100%;
    }
    .page-hero h1,
    .hero-copy h1 {
        letter-spacing: -0.03em;
    }
}