:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --text: #1E293B;
    --muted: #64748B;
    --light: #F6F8FC;
    --line: #E5EAF3;
    --white: #FFFFFF;
    --soft-blue: #EFF6FF;
    --shadow: 0 18px 50px rgba(24, 44, 92, 0.10);
    --radius: 28px;
}

* {
    box-sizing: border-box;
}

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: #FFFFFF;
    line-height: 1.72;
    overflow-x: hidden;
}

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

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

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(229,234,243,0.86);
}

.nav-wrap {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

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

.logo-img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 8px 20px rgba(41,128,254,0.18);
}

.brand-text {
    font-size: 18px;
}

.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    background: var(--white);
    color: var(--text);
    border-radius: 14px;
    font-size: 22px;
    cursor: pointer;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 68px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 11px 14px;
    border-radius: 14px;
    color: #334155;
    font-size: 15px;
}

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

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #FFFFFF;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(41,128,254,0.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
    background: var(--blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(23,104,232,0.28);
}

.section {
    padding: 72px 0;
}

.section.alt,
.page-section.alt {
    background: var(--light);
}

.section-title {
    max-width: 760px;
    margin: 0 auto 34px;
    text-align: center;
}

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

.eyebrow,
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
}

.section-title h2,
.page-hero h1,
.vpn-saas-hero h1,
.content-main h1 {
    margin: 12px 0 12px;
    line-height: 1.15;
    letter-spacing: -0.04em;
}

.section-title h2 {
    font-size: clamp(28px, 4vw, 44px);
}

.section-title p,
.page-hero p,
.hero-copy p,
.card p,
.feature-copy p,
.panel p,
.faq-item p,
.content-main p,
.info-card p,
.step-card p,
.risk-card p {
    color: var(--muted);
}

.vpn-saas-hero {
    position: relative;
    overflow: hidden;
    padding: 50px 0 70px;
    color: #FFFFFF;
    background: var(--gradient);
}

.vpn-saas-hero::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 80px;
    background: #FFFFFF;
    clip-path: polygon(0 55%, 100% 8%, 100% 100%, 0 100%);
}

.hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr;
    gap: 34px;
    align-items: center;
}

.hero-copy h1 {
    font-size: clamp(36px, 8vw, 68px);
    margin: 14px 0;
}

.hero-copy p {
    color: rgba(255,255,255,0.88);
    font-size: 17px;
    max-width: 650px;
}

.hero-tags,
.float-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.hero-tags span,
.float-tags span,
.inline-tags span {
    display: inline-flex;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    border: 1px solid rgba(255,255,255,0.18);
    color: #FFFFFF;
    font-size: 13px;
    font-weight: 700;
}

.hero-actions {
    margin-top: 28px;
}

.hero-visual {
    position: relative;
    min-height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-device-card {
    position: relative;
    width: min(420px, 92%);
    padding: 20px;
    border-radius: 36px;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.26);
    box-shadow: 0 24px 80px rgba(27,34,70,0.28);
}

.hero-device-card img {
    border-radius: 28px;
    margin: 0 auto;
}

.status-card {
    position: absolute;
    background: rgba(255,255,255,0.94);
    color: #172033;
    border-radius: 18px;
    padding: 11px 14px;
    font-size: 13px;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(18,30,66,0.18);
}

.status-card.one { left: 0; top: 40px; }
.status-card.two { right: 0; top: 118px; }
.status-card.three { left: 22px; bottom: 76px; }
.status-card.four { right: 20px; bottom: 22px; }

.product-highlights {
    margin-top: -28px;
    position: relative;
    z-index: 4;
}

.highlight-grid,
.card-grid,
.risk-grid,
.faq-grid,
.process-steps,
.footer-grid,
.two-col,
.three-col {
    display: grid;
    gap: 18px;
}

.highlight-grid {
    grid-template-columns: 1fr;
}

.card,
.highlight-card,
.info-card,
.step-card,
.risk-card,
.faq-item,
.panel,
.side-panel {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 12px 34px rgba(30, 41, 59, 0.06);
}

.highlight-card,
.info-card,
.step-card,
.risk-card,
.faq-item {
    padding: 22px;
}

.highlight-card .tag {
    display: inline-block;
    margin-bottom: 14px;
    padding: 6px 10px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--blue);
    font-weight: 800;
    font-size: 12px;
}

.highlight-card h3,
.info-card h3,
.step-card h3,
.risk-card h3,
.faq-item h3,
.panel h3 {
    margin: 0 0 8px;
    line-height: 1.3;
}

.text-link {
    display: inline-flex;
    align-items: center;
    margin-top: 10px;
    color: var(--blue);
    font-weight: 800;
}

.feature-section,
.vpn-connection-section,
.high-speed-section,
.global-nodes-section,
.privacy-protection-section,
.no-log-policy-section,
.multi-device-section,
.encryption-protocol-section {
    padding: 72px 0;
}

.feature-panel {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
    align-items: center;
    padding: 24px;
    border-radius: 34px;
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

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

.feature-copy h2 {
    margin: 10px 0 12px;
    font-size: clamp(27px, 4vw, 42px);
    line-height: 1.18;
    letter-spacing: -0.035em;
}

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

.feature-list li,
.check-list li,
.clean-list li {
    position: relative;
    padding-left: 24px;
    color: #334155;
}

.feature-list li::before,
.check-list li::before,
.clean-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .72em;
    width: 9px;
    height: 9px;
    border-radius: 99px;
    background: var(--blue);
}

.feature-image {
    border-radius: 30px;
    background: linear-gradient(180deg, #F6F8FF 0%, #FFFFFF 100%);
    padding: 18px;
    min-height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.high-speed-section,
.global-nodes-section,
.multi-device-section {
    background: var(--light);
}

.privacy-board {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}

.privacy-visual-card {
    padding: 22px;
    border-radius: 34px;
    background: linear-gradient(180deg, #FFFFFF, #F8FAFF);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.no-log-panel,
.protocol-panel,
.safety-panel,
.cta-section {
    border-radius: 34px;
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 26px;
}

.no-log-panel {
    display: grid;
    gap: 18px;
}

.protocol-panel {
    background: linear-gradient(135deg, #FFFFFF 0%, #F2F6FF 100%);
}

.process-steps {
    grid-template-columns: 1fr;
}

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

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

.cta-section {
    text-align: center;
    color: #FFFFFF;
    background: var(--gradient);
    border: 0;
    overflow: hidden;
    position: relative;
}

.cta-section h2 {
    margin: 0 0 12px;
    font-size: clamp(28px, 4vw, 44px);
    letter-spacing: -0.035em;
}

.cta-section p {
    color: rgba(255,255,255,0.88);
    max-width: 680px;
    margin: 0 auto 24px;
}

.page-hero {
    padding: 64px 0 42px;
    background: linear-gradient(180deg, #F7F9FF 0%, #FFFFFF 100%);
}

.page-hero-inner {
    max-width: 860px;
}

.page-hero h1 {
    font-size: clamp(34px, 6vw, 58px);
}

.page-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 34px 0 76px;
}

.content-main {
    min-width: 0;
}

.content-block {
    padding: 26px;
    border-radius: 30px;
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: 0 12px 34px rgba(30, 41, 59, 0.06);
    margin-bottom: 18px;
}

.content-block h2 {
    margin-top: 0;
    line-height: 1.25;
}

.side-panel {
    padding: 22px;
    align-self: start;
    position: sticky;
    top: 92px;
}

.side-panel h3 {
    margin-top: 0;
}

.side-panel a {
    display: block;
    color: var(--blue);
    font-weight: 800;
    margin-top: 10px;
}

.page-download-box {
    margin-top: 22px;
}

.download-page-panel {
    display: grid;
    gap: 24px;
    align-items: center;
    padding: 28px;
    border-radius: 34px;
    background: var(--gradient);
    color: #FFFFFF;
}

.download-page-panel p,
.download-page-panel li {
    color: rgba(255,255,255,0.9);
}

.faq-list {
    display: grid;
    gap: 16px;
}

.faq-item h2,
.faq-item h3 {
    font-size: 19px;
}

.site-footer {
    background: #172033;
    color: rgba(255,255,255,0.78);
    padding: 56px 0 24px;
}

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

.footer-brand {
    color: #FFFFFF;
    font-size: 22px;
    font-weight: 900;
    margin-bottom: 10px;
}

.site-footer h3 {
    color: #FFFFFF;
    margin: 0 0 12px;
}

.site-footer a {
    display: block;
    margin: 8px 0;
    color: rgba(255,255,255,0.74);
}

.footer-bottom {
    margin-top: 34px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.12);
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 13px;
}

@media (min-width: 720px) {
    .container {
        width: min(1120px, calc(100% - 48px));
    }

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

    .card-grid,
    .risk-grid,
    .faq-grid,
    .process-steps,
    .two-col {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .privacy-board {
        grid-template-columns: 1.1fr .9fr;
    }

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

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

@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: 82px 0 120px;
    }

    .hero-grid {
        grid-template-columns: 1.05fr .95fr;
        gap: 56px;
    }

    .feature-panel {
        grid-template-columns: 1fr 1fr;
        padding: 36px;
    }

    .feature-panel.reverse .feature-image {
        order: 2;
    }

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

    .no-log-panel {
        grid-template-columns: .9fr 1.1fr;
        align-items: center;
    }

    .page-layout {
        grid-template-columns: minmax(0, 1fr) 310px;
    }

    .download-page-panel {
        grid-template-columns: 1fr .9fr;
    }
}

@media (max-width: 420px) {
    .container {
        width: min(100% - 24px, 1120px);
    }

    .download-btn {
        width: 100%;
    }

    .hero-tags span,
    .float-tags span,
    .inline-tags span {
        font-size: 12px;
    }

    .status-card {
        position: static;
        margin: 8px 6px 0 0;
        display: inline-flex;
    }

    .hero-visual {
        display: block;
        min-height: auto;
    }

    .hero-device-card {
        width: 100%;
        margin-bottom: 12px;
    }
}