* {
    box-sizing: border-box;
}

:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1E2430;
    --muted: #626B7A;
    --light: #F5F7FB;
    --lighter: #F8FAFF;
    --border: #E6EBF3;
    --white: #FFFFFF;
    --shadow: 0 18px 50px rgba(38, 64, 130, 0.12);
    --radius-lg: 32px;
    --radius-md: 24px;
    --radius-sm: 18px;
}

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: var(--white);
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

.container {
    width: min(1120px, calc(100% - 36px));
    margin: 0 auto;
}

.container.narrow {
    width: min(850px, calc(100% - 36px));
}

.section {
    padding: 72px 0;
}

.section-heading {
    text-align: center;
    margin-bottom: 34px;
}

.section-heading.left {
    text-align: left;
}

.section-kicker,
.eyebrow,
.page-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--blue);
    background: rgba(41, 128, 254, 0.10);
    border: 1px solid rgba(41, 128, 254, 0.16);
    padding: 6px 12px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 13px;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    font-size: clamp(34px, 8vw, 62px);
    line-height: 1.12;
    letter-spacing: -0.04em;
    margin: 18px 0 18px;
}

h2 {
    font-size: clamp(26px, 5vw, 40px);
    line-height: 1.22;
    letter-spacing: -0.03em;
    margin-bottom: 14px;
}

h3 {
    font-size: 19px;
    line-height: 1.35;
    margin-bottom: 8px;
}

p {
    color: var(--muted);
    margin-bottom: 18px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(230, 235, 243, 0.9);
}

.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;
}

.brand,
.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--text);
}

.brand-logo,
.footer-brand img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}

.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.nav-toggle-label {
    color: var(--blue);
    font-weight: 800;
    border: 1px solid rgba(41, 128, 254, 0.22);
    padding: 8px 12px;
    border-radius: 999px;
}

.site-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 4px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 12px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    color: #3E4655;
    font-weight: 650;
    padding: 10px 12px;
    border-radius: 14px;
}

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

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(41, 128, 254, 0.28);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    background: #1768E8;
    transform: translateY(-2px);
    box-shadow: 0 16px 36px rgba(23, 104, 232, 0.30);
}

.text-link {
    display: inline-flex;
    color: var(--blue);
    font-weight: 800;
    margin-top: 8px;
}

.center-link {
    display: flex;
    justify-content: center;
}

.vpn-saas-hero {
    position: relative;
    background: var(--gradient);
    color: #fff;
    overflow: hidden;
    padding: 68px 0 78px;
    border-bottom-left-radius: 36px;
    border-bottom-right-radius: 36px;
}

.vpn-saas-hero::after {
    content: "";
    position: absolute;
    inset: auto -10% -26% 0;
    height: 52%;
    background: rgba(255, 255, 255, 0.14);
    transform: skewY(-6deg);
    transform-origin: left;
}

.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 42px;
    align-items: center;
}

.hero-copy p,
.vpn-saas-hero p {
    color: rgba(255, 255, 255, 0.88);
    font-size: 17px;
}

.vpn-saas-hero .eyebrow {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.25);
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.hero-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.16);
    border: 1px solid rgba(255, 255, 255, 0.20);
    color: #fff;
    font-weight: 700;
    font-size: 13px;
}

.hero-visual {
    position: relative;
    min-height: 360px;
    display: grid;
    place-items: center;
}

.hero-phone {
    width: min(360px, 85vw);
    border-radius: 34px;
    box-shadow: 0 26px 70px rgba(0, 0, 0, 0.22);
}

.float-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.94);
    color: #23304A;
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: var(--shadow);
    border-radius: 18px;
    padding: 10px 14px;
    font-weight: 800;
    font-size: 14px;
}

.card-one { top: 28px; left: 10px; }
.card-two { top: 90px; right: 2px; }
.card-three { bottom: 84px; left: 0; }
.card-four { bottom: 34px; right: 16px; }

.highlight-grid,
.policy-grid,
.risk-grid,
.detail-card-grid,
.about-grid,
.privacy-grid,
.process-steps,
.faq-list.compact {
    display: grid;
    gap: 18px;
}

.highlight-card,
.content-card,
.tip-card,
.faq-item,
.article-panel,
.side-panel,
.detail-card-grid article,
.policy-grid article,
.privacy-grid article,
.risk-grid article,
.process-steps article {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: 0 10px 32px rgba(38, 64, 130, 0.07);
}

.highlight-card span,
.process-steps span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: rgba(41, 128, 254, 0.1);
    color: var(--blue);
    font-weight: 900;
    margin-bottom: 14px;
}

.highlight-card a,
.process-steps a,
.risk-grid a,
.side-links a {
    color: var(--blue);
    font-weight: 800;
}

.feature-split,
.product-highlights,
.faq-preview,
.process-section,
.compact-section {
    background: #fff;
}

.split-grid,
.two-column,
.detail-grid,
.speed-card,
.protocol-panel {
    display: grid;
    gap: 26px;
    align-items: center;
}

.feature-copy {
    padding: 8px 0;
}

.check-list,
.number-list {
    padding: 0;
    margin: 18px 0 0;
    list-style: none;
}

.check-list li,
.number-list li {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    color: #465064;
    margin-bottom: 12px;
}

.check-list li::before {
    content: "";
    width: 9px;
    height: 9px;
    flex: 0 0 9px;
    margin-top: 10px;
    border-radius: 50%;
    background: var(--blue);
}

.number-list li {
    flex-direction: column;
    padding: 16px;
    background: var(--lighter);
    border: 1px solid var(--border);
    border-radius: 18px;
}

.number-list strong {
    color: var(--text);
}

.number-list span {
    color: var(--muted);
}

.glass-panel,
.node-panel,
.device-panel,
.feature-media,
.speed-card,
.protocol-panel,
.privacy-panel {
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, #FFFFFF 0%, #F5F8FF 100%);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 24px;
}

.feature-media img {
    margin: 0 auto;
    border-radius: 26px;
}

.soft-section {
    background: linear-gradient(180deg, #F8FAFF 0%, #FFFFFF 100%);
}

.speed-card img,
.protocol-panel img {
    border-radius: 26px;
    margin: 0 auto;
}

.mini-stats,
.device-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 18px 0 8px;
}

.mini-stats span,
.device-chips span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, 0.1);
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
}

.info-row {
    display: grid;
    gap: 4px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.info-row strong {
    color: var(--text);
}

.info-row span {
    color: var(--muted);
}

.privacy-panel {
    padding: 28px;
}

.privacy-grid img {
    border-radius: 26px;
    align-self: stretch;
    object-fit: cover;
    min-height: 240px;
}

.no-log-policy-section {
    background: #fff;
}

.policy-grid article {
    border-top: 4px solid var(--blue);
}

.process-steps article {
    position: relative;
}

.safety-panel {
    background: var(--lighter);
}

.risk-grid article {
    border-left: 4px solid var(--blue);
}

.risk-grid strong {
    display: block;
    margin-top: 12px;
    color: var(--text);
}

.risk-grid span {
    display: block;
    color: var(--muted);
}

.faq-item h2,
.faq-item h3 {
    margin-bottom: 8px;
}

.cta-section {
    padding: 82px 0;
    color: #fff;
    background: var(--gradient);
    border-top-left-radius: 36px;
    border-top-right-radius: 36px;
}

.cta-inner {
    text-align: center;
}

.cta-inner p {
    color: rgba(255, 255, 255, 0.88);
}

.page-hero {
    padding: 76px 0 54px;
    background: linear-gradient(180deg, #F7F9FF 0%, #FFFFFF 100%);
    text-align: center;
}

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

.detail-section {
    background: #fff;
}

.detail-grid {
    align-items: start;
}

.article-panel p:last-child,
.content-card p:last-child,
.tip-card p:last-child,
.faq-item p:last-child {
    margin-bottom: 0;
}

.side-panel {
    background: var(--lighter);
}

.side-links {
    display: grid;
    gap: 12px;
}

.side-links a {
    display: block;
    padding: 14px 16px;
    border-radius: 16px;
    background: #fff;
    border: 1px solid var(--border);
}

.detail-card-grid article {
    min-height: 150px;
}

.about-grid {
    align-items: stretch;
}

.wide-card {
    grid-column: 1 / -1;
}

.site-footer {
    background: #111827;
    color: #fff;
    padding-top: 58px;
}

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

.footer-grid {
    display: grid;
    gap: 28px;
}

.site-footer h3 {
    font-size: 16px;
    color: #fff;
}

.site-footer a {
    display: block;
    color: rgba(255, 255, 255, 0.72);
    margin-bottom: 8px;
}

.footer-brand {
    color: #fff;
    margin-bottom: 12px;
}

.footer-bottom {
    margin-top: 36px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    padding: 18px;
}

.footer-bottom p {
    margin: 0;
    font-size: 14px;
}

@media (min-width: 640px) {
    .highlight-grid,
    .policy-grid,
    .risk-grid,
    .detail-card-grid,
    .process-steps,
    .faq-list.compact,
    .about-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .privacy-grid img {
        grid-column: 1 / -1;
    }
}

@media (min-width: 900px) {
    .nav-toggle-label {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 2px;
        background: transparent;
        border: 0;
        box-shadow: none;
        padding: 0;
        width: auto;
    }

    .site-nav a {
        font-size: 14px;
        padding: 8px 10px;
    }

    .vpn-saas-hero {
        padding: 94px 0 106px;
        border-bottom-left-radius: 58px;
        border-bottom-right-radius: 58px;
    }

    .hero-grid,
    .split-grid,
    .speed-card,
    .protocol-panel,
    .two-column,
    .detail-grid {
        grid-template-columns: 1.05fr 0.95fr;
    }

    .reverse .split-grid {
        grid-template-columns: 0.95fr 1.05fr;
    }

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

    .risk-grid,
    .detail-card-grid,
    .policy-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

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

    .privacy-grid img {
        grid-column: span 1;
        grid-row: span 1;
    }

    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
    }

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

    .section {
        padding: 92px 0;
    }

    .page-hero {
        padding: 92px 0 70px;
    }
}

@media (min-width: 1120px) {
    .site-nav a {
        padding: 8px 12px;
    }

    .hero-visual {
        min-height: 460px;
    }

    .hero-phone {
        width: 420px;
    }

    .card-one { left: 36px; }
    .card-two { right: 24px; }
    .card-three { left: 18px; }
    .card-four { right: 54px; }
}

@media (max-width: 420px) {
    .container,
    .container.narrow {
        width: min(100% - 26px, 1120px);
    }

    .download-btn {
        width: 100%;
    }

    .hero-copy .download-btn,
    .cta-inner .download-btn,
    .page-hero .download-btn {
        width: 100%;
    }

    .float-card {
        font-size: 12px;
        padding: 8px 10px;
    }

    .section {
        padding: 58px 0;
    }
}