* {
    box-sizing: border-box;
}

:root {
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #172033;
    --muted: #657085;
    --light: #F5F7FB;
    --line: #E7ECF5;
    --card: #FFFFFF;
    --soft-blue: #EEF5FF;
    --shadow: 0 18px 50px rgba(31, 49, 92, 0.10);
    --radius: 28px;
}

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: #F7F9FD;
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

.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(231, 236, 245, 0.85);
}

.header-inner {
    width: min(1180px, calc(100% - 32px));
    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: 800;
    letter-spacing: -0.02em;
    color: #14213D;
}

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

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: #1B2742;
    border-radius: 999px;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 76px;
    display: none;
    flex-direction: column;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 12px;
    box-shadow: var(--shadow);
}

.site-nav.open {
    display: flex;
}

.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #41506B;
    font-size: 15px;
    font-weight: 600;
}

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

main {
    background: #F7F9FD;
}

.content-container {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}

.section {
    padding: 58px 0;
}

.section-title {
    max-width: 760px;
    margin: 0 auto 28px;
    text-align: center;
}

.section-title.align-left {
    margin-left: 0;
    text-align: left;
}

.eyebrow,
.category-badge,
.mini-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, 0.10);
    color: var(--blue);
    font-size: 13px;
    font-weight: 700;
}

.section-title h2,
.article-panel h2,
.side-panel h2 {
    margin: 12px 0 10px;
    font-size: clamp(26px, 4vw, 42px);
    line-height: 1.18;
    letter-spacing: -0.04em;
}

.section-title p,
.article-panel p,
.hero-copy p,
.feature-text p,
.page-hero p,
.download-panel p,
.card p,
.highlight-card p,
.faq-item p,
.risk-card p,
.side-panel p {
    color: var(--muted);
    margin: 0;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    border: 0;
    box-shadow: 0 14px 28px rgba(41, 128, 254, 0.24);
    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, 0.28);
}

.link-arrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--blue);
    font-weight: 800;
    margin-top: 14px;
}

.link-arrow::after {
    content: "→";
}

.vpn-saas-hero {
    position: relative;
    overflow: hidden;
    padding: 42px 0 58px;
    background: var(--brand-gradient);
    color: #fff;
}

.vpn-saas-hero::after {
    content: "";
    position: absolute;
    left: -5%;
    right: -5%;
    bottom: -56px;
    height: 120px;
    background: #F7F9FD;
    transform: skewY(-4deg);
    transform-origin: left top;
}

.hero-inner {
    position: relative;
    z-index: 2;
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 32px;
    align-items: center;
}

.hero-copy h1 {
    margin: 14px 0;
    max-width: 680px;
    font-size: clamp(38px, 9vw, 68px);
    line-height: 1.05;
    letter-spacing: -0.06em;
}

.hero-copy p {
    color: rgba(255, 255, 255, 0.88);
    font-size: 17px;
    max-width: 620px;
}

.hero-actions {
    margin-top: 26px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
}

.security-tags,
.hero-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.security-tags span,
.hero-tags span,
.inline-tags span {
    display: inline-flex;
    padding: 7px 12px;
    border-radius: 999px;
    color: #fff;
    background: rgba(255, 255, 255, 0.16);
    border: 1px solid rgba(255, 255, 255, 0.24);
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    min-height: 330px;
}

.product-card {
    width: min(420px, 92%);
    margin: 0 auto;
    padding: 18px;
    border-radius: 36px;
    background: rgba(255, 255, 255, 0.16);
    box-shadow: 0 26px 80px rgba(12, 22, 65, 0.22);
    border: 1px solid rgba(255, 255, 255, 0.24);
}

.product-card img {
    border-radius: 28px;
    background: #fff;
}

.float-label {
    position: absolute;
    padding: 10px 14px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.94);
    color: #172033;
    font-weight: 800;
    box-shadow: 0 16px 40px rgba(14, 28, 72, 0.14);
    font-size: 13px;
}

.float-label.one { top: 18px; left: 0; }
.float-label.two { top: 86px; right: 2px; }
.float-label.three { bottom: 74px; left: 10px; }
.float-label.four { bottom: 8px; right: 28px; }

.product-highlights {
    position: relative;
    z-index: 4;
    margin-top: -10px;
}

.highlight-grid {
    display: grid;
    gap: 16px;
}

.highlight-card,
.card,
.risk-card,
.faq-item,
.step-card,
.info-card,
.article-panel,
.side-panel,
.download-panel {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 14px 40px rgba(31, 49, 92, 0.06);
}

.highlight-card {
    padding: 22px;
}

.highlight-card h3,
.card h3,
.risk-card h3,
.step-card h3,
.info-card h3 {
    margin: 10px 0 8px;
    font-size: 20px;
    letter-spacing: -0.02em;
}

.badge-dot {
    display: inline-flex;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    border-radius: 13px;
    background: var(--soft-blue);
    color: var(--blue);
    font-weight: 900;
}

.feature-split {
    display: grid;
    gap: 24px;
    align-items: center;
}

.feature-panel {
    padding: 24px;
    border-radius: 34px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.feature-panel.blue-soft {
    background: linear-gradient(180deg, #F8FBFF 0%, #FFFFFF 100%);
}

.feature-text h2 {
    margin: 12px 0;
    font-size: clamp(28px, 5vw, 46px);
    line-height: 1.15;
    letter-spacing: -0.04em;
}

.feature-list {
    display: grid;
    gap: 12px;
    margin: 22px 0 0;
    padding: 0;
    list-style: none;
}

.feature-list li {
    position: relative;
    padding-left: 28px;
    color: #33405A;
}

.feature-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 12px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: 0 0 0 5px rgba(41, 128, 254, 0.12);
}

.high-speed-section,
.no-log-policy-section,
.faq-section {
    background: #EEF3FA;
}

.speed-card {
    display: grid;
    gap: 18px;
    padding: 22px;
    border-radius: 34px;
    background: #fff;
    border: 1px solid var(--line);
}

.stat-row {
    display: grid;
    gap: 12px;
}

.stat-box {
    padding: 18px;
    border-radius: 22px;
    background: #F5F8FE;
    border: 1px solid var(--line);
}

.stat-box strong {
    display: block;
    color: var(--blue);
    font-size: 22px;
}

.global-layout {
    display: grid;
    gap: 20px;
}

.node-card-list {
    display: grid;
    gap: 14px;
}

.node-card {
    padding: 18px;
    border-radius: 22px;
    background: #fff;
    border: 1px solid var(--line);
}

.node-card h3 {
    margin: 0 0 6px;
}

.privacy-panel {
    display: grid;
    gap: 20px;
    padding: 24px;
    border-radius: 34px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.privacy-cards,
.no-log-grid,
.protocol-grid,
.risk-grid,
.faq-grid {
    display: grid;
    gap: 16px;
}

.info-card,
.risk-card,
.step-card,
.card {
    padding: 20px;
}

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

.device-showcase {
    display: grid;
    gap: 16px;
}

.device-card {
    min-height: 180px;
    padding: 22px;
    border-radius: 28px;
    background: #fff;
    border: 1px solid var(--line);
}

.protocol-panel {
    display: grid;
    gap: 20px;
    padding: 24px;
    border-radius: 34px;
    background: linear-gradient(135deg, #FFFFFF 0%, #F1F6FF 100%);
    border: 1px solid var(--line);
}

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

.step-card {
    position: relative;
    padding-left: 76px;
}

.step-number {
    position: absolute;
    left: 20px;
    top: 22px;
    width: 40px;
    height: 40px;
    border-radius: 15px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-gradient);
    color: #fff;
    font-weight: 900;
}

.safety-panel {
    padding: 24px;
    border-radius: 34px;
    background: #fff;
    border: 1px solid var(--line);
}

.faq-item {
    padding: 20px;
}

.faq-item h3 {
    margin: 0 0 8px;
    font-size: 18px;
}

.cta-section {
    padding: 68px 0;
    background: var(--brand-gradient);
    color: #fff;
    text-align: center;
}

.cta-box {
    width: min(850px, calc(100% - 32px));
    margin: 0 auto;
}

.cta-box h2 {
    margin: 0 0 12px;
    font-size: clamp(30px, 6vw, 48px);
    line-height: 1.16;
    letter-spacing: -0.04em;
}

.cta-box p {
    color: rgba(255,255,255,.86);
    margin: 0 auto 24px;
    max-width: 680px;
}

.page-hero {
    padding: 52px 0 36px;
    background: linear-gradient(180deg, #EFF5FF 0%, #F7F9FD 100%);
}

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

.page-hero h1 {
    margin: 14px 0 12px;
    font-size: clamp(34px, 8vw, 58px);
    line-height: 1.08;
    letter-spacing: -0.05em;
}

.page-actions {
    margin-top: 24px;
}

.two-column-layout {
    display: grid;
    gap: 22px;
    padding: 42px 0 70px;
}

.article-panel {
    padding: 24px;
}

.article-panel h2 {
    font-size: clamp(24px, 4vw, 34px);
}

.article-panel h3 {
    margin: 28px 0 10px;
    font-size: 22px;
}

.article-panel p + p {
    margin-top: 14px;
}

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

.check-list li,
.number-list li {
    padding: 14px 16px;
    border-radius: 18px;
    background: #F6F8FC;
    border: 1px solid var(--line);
    color: #34415B;
}

.number-list {
    counter-reset: item;
}

.number-list li {
    counter-increment: item;
}

.number-list li::before {
    content: counter(item, decimal-leading-zero);
    display: inline-flex;
    margin-right: 10px;
    color: var(--blue);
    font-weight: 900;
}

.side-panel {
    padding: 22px;
    height: fit-content;
}

.side-panel h2 {
    font-size: 24px;
}

.side-panel a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
    color: var(--blue);
    font-weight: 800;
}

.download-hero {
    padding-bottom: 58px;
}

.download-panel {
    margin-top: 30px;
    padding: 24px;
    display: grid;
    gap: 22px;
}

.download-note-grid {
    display: grid;
    gap: 14px;
}

.about-grid {
    display: grid;
    gap: 16px;
}

.site-footer {
    background: #10192C;
    color: #DDE6F8;
    padding-top: 48px;
}

.footer-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 30px;
}

.footer-brand p {
    color: #AAB7D1;
    max-width: 450px;
}

.footer-logo {
    color: #fff;
}

.footer-links {
    display: grid;
    gap: 22px;
}

.footer-links h3 {
    color: #fff;
    margin: 0 0 10px;
}

.footer-links a {
    display: block;
    color: #AAB7D1;
    padding: 5px 0;
}

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

.footer-bottom {
    width: min(1180px, calc(100% - 32px));
    margin: 34px auto 0;
    padding: 20px 0;
    border-top: 1px solid rgba(255,255,255,.12);
    color: #AAB7D1;
}

@media (min-width: 700px) {
    .highlight-grid,
    .privacy-cards,
    .no-log-grid,
    .protocol-grid,
    .risk-grid,
    .faq-grid,
    .download-note-grid,
    .about-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .stat-row {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .process-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-links {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (min-width: 980px) {
    .nav-toggle {
        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;
    }

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

    .vpn-saas-hero {
        padding: 76px 0 112px;
    }

    .hero-inner {
        grid-template-columns: 1.05fr .95fr;
        gap: 60px;
    }

    .hero-actions {
        flex-direction: row;
        align-items: center;
    }

    .highlight-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .feature-split,
    .global-layout,
    .privacy-panel,
    .protocol-panel,
    .speed-card,
    .device-showcase {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .feature-split.reverse .feature-text {
        order: 2;
    }

    .feature-split.reverse .feature-panel {
        order: 1;
    }

    .privacy-cards,
    .no-log-grid,
    .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .protocol-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .process-steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .two-column-layout {
        grid-template-columns: minmax(0, 1fr) 330px;
        align-items: start;
    }

    .article-panel {
        padding: 34px;
    }

    .footer-inner {
        grid-template-columns: 1fr 1.4fr;
        align-items: start;
    }
}

@media (min-width: 1180px) {
    .site-nav a {
        padding: 8px 13px;
    }
}