* {
    box-sizing: border-box;
}

:root {
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --soft: #f5f7fb;
    --line: #e5eaf3;
    --white: #ffffff;
    --dark: #101828;
    --radius-xl: 30px;
    --radius-lg: 24px;
    --shadow: 0 20px 55px rgba(31, 41, 55, 0.10);
    --light-shadow: 0 12px 35px rgba(31, 41, 55, 0.08);
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    color: var(--text);
    background: #ffffff;
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

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

h1, h2, h3 {
    margin: 0;
    color: var(--dark);
    line-height: 1.2;
}

ul, ol {
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(229, 234, 243, 0.85);
}

.nav-container {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand, .footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: 0.02em;
    color: #172033;
}

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

.nav-check {
    display: none;
}

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

.nav-toggle span {
    width: 18px;
    height: 2px;
    background: #253046;
    border-radius: 10px;
}

.site-nav {
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    display: none;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
}

.nav-check:checked ~ .site-nav {
    display: grid;
    gap: 4px;
}

.site-nav a {
    padding: 12px 14px;
    border-radius: 14px;
    color: #475467;
    font-size: 15px;
    font-weight: 600;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--blue);
    background: #eef5ff;
}

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

.narrow-container {
    width: min(900px, calc(100% - 32px));
    margin: 0 auto;
}

.section {
    padding: 72px 0;
}

.section-soft {
    background: linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
}

.section-title {
    text-align: center;
    margin-bottom: 30px;
}

.section-title .eyebrow,
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--blue);
    background: #eef5ff;
    border: 1px solid #d9e9ff;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-title h2 {
    font-size: clamp(28px, 5vw, 42px);
}

.section-title p {
    margin: 12px auto 0;
    max-width: 720px;
}

.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;
    box-shadow: 0 12px 28px rgba(41, 128, 254, 0.28);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    background: var(--blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(23, 104, 232, 0.32);
}

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

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

.vpn-saas-hero {
    position: relative;
    padding: 48px 0 74px;
    overflow: hidden;
}

.vpn-saas-hero::before {
    content: "";
    position: absolute;
    inset: 0 0 140px 0;
    background: var(--brand-gradient);
    clip-path: polygon(0 0, 100% 0, 100% 83%, 0 100%);
    z-index: -2;
}

.vpn-saas-hero::after {
    content: "";
    position: absolute;
    width: 420px;
    height: 420px;
    right: -160px;
    top: 40px;
    background: rgba(255, 255, 255, 0.22);
    border-radius: 50%;
    filter: blur(8px);
    z-index: -1;
}

.hero-grid {
    display: grid;
    gap: 34px;
    align-items: center;
}

.hero-copy {
    color: #fff;
    padding-top: 18px;
}

.hero-copy h1 {
    color: #fff;
    font-size: clamp(38px, 9vw, 68px);
    letter-spacing: -0.04em;
    max-width: 820px;
}

.hero-copy p {
    color: rgba(255, 255, 255, 0.86);
    margin: 18px 0 24px;
    max-width: 660px;
    font-size: 17px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.hero-tags span,
.float-card,
.status-pill {
    border: 1px solid rgba(255, 255, 255, 0.38);
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
    border-radius: 999px;
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    border-radius: 36px;
    padding: 18px;
    background: rgba(255, 255, 255, 0.16);
    border: 1px solid rgba(255, 255, 255, 0.24);
    box-shadow: var(--shadow);
}

.hero-visual img {
    width: min(480px, 100%);
    margin: 0 auto;
    border-radius: 28px;
}

.float-card {
    position: static;
    display: inline-flex;
    margin: 8px 6px 0 0;
    color: #24304b;
    background: rgba(255, 255, 255, 0.90);
    border-color: rgba(255, 255, 255, 0.85);
    box-shadow: var(--light-shadow);
}

.product-highlights {
    margin-top: -44px;
    position: relative;
    z-index: 4;
}

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

.highlight-card {
    padding: 24px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--light-shadow);
}

.highlight-card .tag {
    display: inline-block;
    color: var(--blue);
    background: #eef5ff;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 14px;
}

.highlight-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.highlight-card p {
    margin-bottom: 14px;
}

.feature-panel {
    display: grid;
    gap: 28px;
    align-items: center;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    padding: 24px;
    box-shadow: var(--light-shadow);
}

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

.feature-copy h2 {
    font-size: clamp(26px, 5vw, 40px);
    margin-bottom: 14px;
}

.feature-copy p {
    margin-bottom: 18px;
}

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

.feature-list li {
    padding: 12px 14px;
    border-radius: 16px;
    background: #f7f9fe;
    border: 1px solid #edf1f8;
    color: #344054;
}

.feature-image {
    position: relative;
    overflow: hidden;
    border-radius: 30px;
    background: linear-gradient(145deg, #f2f6ff, #ffffff);
    padding: 18px;
}

.feature-image img {
    width: 100%;
    border-radius: 24px;
}

.high-speed-section .feature-panel {
    background: linear-gradient(145deg, #f8fbff 0%, #ffffff 58%);
}

.speed-metrics,
.privacy-cards,
.policy-grid,
.device-grid,
.protocol-grid,
.risk-grid,
.faq-grid,
.cards-grid {
    display: grid;
    gap: 16px;
}

.metric-card,
.privacy-card,
.policy-card,
.device-card,
.protocol-card,
.risk-card,
.faq-item,
.info-card,
.check-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: 0 10px 28px rgba(31, 41, 55, 0.06);
}

.metric-card strong,
.risk-card strong {
    display: block;
    color: var(--blue);
    font-size: 13px;
    margin-bottom: 6px;
}

.global-nodes-section {
    background: #f7f9fd;
}

.node-board {
    display: grid;
    gap: 18px;
    align-items: center;
    background: #fff;
    border-radius: 32px;
    border: 1px solid var(--line);
    padding: 22px;
    box-shadow: var(--light-shadow);
}

.node-lines {
    display: grid;
    gap: 12px;
}

.node-line {
    padding: 16px;
    border-radius: 18px;
    background: #f7f9fe;
    border-left: 4px solid var(--blue);
}

.privacy-protection-section .privacy-wrap {
    display: grid;
    gap: 18px;
}

.privacy-visual {
    background: var(--brand-gradient);
    border-radius: 32px;
    padding: 20px;
}

.privacy-visual img {
    border-radius: 24px;
    background: #fff;
}

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

.device-showcase {
    display: grid;
    gap: 18px;
    align-items: center;
    border-radius: 32px;
    background: linear-gradient(145deg, #ffffff 0%, #f4f7ff 100%);
    border: 1px solid var(--line);
    padding: 24px;
}

.protocol-board {
    background: #172033;
    color: #fff;
    border-radius: 32px;
    padding: 24px;
    display: grid;
    gap: 16px;
}

.protocol-board h2,
.protocol-board h3 {
    color: #fff;
}

.protocol-board p,
.protocol-board li {
    color: rgba(255, 255, 255, 0.78);
}

.protocol-card {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.14);
}

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

.step-card {
    position: relative;
    padding: 22px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 30px rgba(31, 41, 55, 0.06);
}

.step-number {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--blue);
    color: #fff;
    border-radius: 14px;
    font-weight: 900;
    margin-bottom: 14px;
}

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

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

.cta-section {
    padding: 78px 0;
}

.cta-card {
    text-align: center;
    color: #fff;
    background: var(--brand-gradient);
    border-radius: 36px;
    padding: 44px 22px;
    overflow: hidden;
    position: relative;
}

.cta-card::before,
.cta-card::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.16);
}

.cta-card::before {
    width: 180px;
    height: 180px;
    left: -70px;
    top: -70px;
}

.cta-card::after {
    width: 240px;
    height: 240px;
    right: -90px;
    bottom: -110px;
}

.cta-card h2,
.cta-card p,
.cta-card .download-btn {
    position: relative;
    z-index: 2;
}

.cta-card h2 {
    color: #fff;
    font-size: clamp(28px, 6vw, 44px);
    margin-bottom: 12px;
}

.cta-card p {
    color: rgba(255, 255, 255, 0.84);
    max-width: 700px;
    margin: 0 auto 22px;
}

.inner-hero {
    padding: 64px 0 42px;
    background: linear-gradient(180deg, #f5f8ff 0%, #ffffff 100%);
}

.inner-hero-card {
    display: grid;
    gap: 22px;
    border-radius: 34px;
    padding: 26px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--light-shadow);
}

.inner-hero h1 {
    font-size: clamp(32px, 7vw, 56px);
    letter-spacing: -0.03em;
    margin-bottom: 14px;
}

.category-badge {
    display: inline-flex;
    color: var(--blue);
    background: #eef5ff;
    border: 1px solid #d9e9ff;
    padding: 7px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 14px;
}

.content-grid {
    display: grid;
    gap: 22px;
    align-items: start;
}

.article-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 24px;
    box-shadow: 0 12px 32px rgba(31, 41, 55, 0.06);
}

.article-panel h2 {
    font-size: 26px;
    margin: 22px 0 12px;
}

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

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

.side-panel {
    display: grid;
    gap: 16px;
}

.side-card {
    border-radius: 24px;
    padding: 20px;
    background: #f7f9fe;
    border: 1px solid var(--line);
}

.side-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.notice-box {
    padding: 18px;
    border-radius: 22px;
    background: #eef5ff;
    border: 1px solid #d9e9ff;
    color: #344054;
    margin-top: 20px;
}

.download-page .download-focus {
    text-align: center;
    max-width: 780px;
    margin: 0 auto;
}

.download-page .download-focus .download-btn {
    margin: 26px 0;
}

.install-steps {
    display: grid;
    gap: 14px;
    margin-top: 24px;
}

.install-step {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 14px;
    align-items: start;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 16px;
}

.install-step span {
    width: 36px;
    height: 36px;
    background: #eef5ff;
    color: var(--blue);
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
}

.site-footer {
    background: #101828;
    color: #fff;
    padding: 54px 0 24px;
}

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

.footer-brand p {
    color: rgba(255, 255, 255, 0.66);
    margin-top: 14px;
    max-width: 420px;
}

.footer-logo span {
    color: #fff;
}

.site-footer h3 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 12px;
}

.site-footer a {
    display: block;
    color: rgba(255, 255, 255, 0.66);
    padding: 5px 0;
}

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

.footer-bottom {
    width: min(1160px, calc(100% - 32px));
    margin: 28px auto 0;
    padding-top: 20px;
    color: rgba(255, 255, 255, 0.52);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    font-size: 14px;
}

@media (min-width: 720px) {
    .highlight-grid,
    .privacy-cards,
    .policy-grid,
    .device-grid,
    .protocol-grid,
    .risk-grid,
    .faq-grid,
    .cards-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

    .footer-grid {
        grid-template-columns: 1.6fr 1fr 1fr 1fr;
    }
}

@media (min-width: 960px) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 3px;
        padding: 0;
        background: transparent;
        border: 0;
        box-shadow: none;
        border-radius: 0;
    }

    .site-nav a {
        padding: 9px 10px;
        font-size: 14px;
    }

    .hero-grid {
        grid-template-columns: 1.08fr 0.92fr;
        min-height: 620px;
    }

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

    .float-card.one {
        left: -8px;
        top: 42px;
    }

    .float-card.two {
        right: -4px;
        top: 120px;
    }

    .float-card.three {
        left: 24px;
        bottom: 88px;
    }

    .float-card.four {
        right: 28px;
        bottom: 42px;
    }

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

    .feature-panel,
    .node-board,
    .device-showcase,
    .inner-hero-card {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        padding: 34px;
    }

    .feature-panel.reverse .feature-image {
        order: initial;
    }

    .privacy-protection-section .privacy-wrap {
        grid-template-columns: 1.1fr 0.9fr;
        align-items: center;
    }

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

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

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

    .article-panel {
        padding: 34px;
    }

    .section {
        padding: 92px 0;
    }
}

@media (min-width: 1180px) {
    .site-nav a {
        padding: 10px 13px;
    }
}

@media (max-width: 420px) {
    .container,
    .narrow-container,
    .nav-container,
    .footer-grid,
    .footer-bottom {
        width: min(100% - 24px, 1160px);
    }

    .download-btn {
        width: 100%;
    }

    .hero-copy p {
        font-size: 15px;
    }

    .section {
        padding: 56px 0;
    }

    .cta-card {
        border-radius: 28px;
    }
}