:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #172033;
    --muted: #687389;
    --light: #F5F7FB;
    --soft-blue: #F0F6FF;
    --line: #E7ECF5;
    --white: #FFFFFF;
    --radius-lg: 32px;
    --radius-md: 24px;
    --shadow: 0 20px 60px rgba(28, 47, 92, 0.10);
}

* { 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: #FBFCFF;
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 16px; color: var(--muted); }
 h1, h2, h3 { margin: 0; line-height: 1.22; color: var(--text); }
 h1 { font-size: clamp(34px, 8vw, 64px); letter-spacing: -1.8px; }
 h2 { font-size: clamp(26px, 5vw, 42px); letter-spacing: -0.8px; }
 h3 { font-size: 20px; }

.container {
    width: min(1120px, calc(100% - 36px));
    margin: 0 auto;
}
.section { padding: 68px 0; }
.section.soft { background: var(--light); }
.section-heading {
    max-width: 740px;
    margin: 0 auto 28px;
    text-align: center;
}
.section-heading p { margin-top: 12px; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: fit-content;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, 0.10);
    color: #1F69D8;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 14px;
}
.text-link {
    color: #1F69D8;
    font-weight: 700;
    display: inline-flex;
    margin-top: 8px;
}
.text-link:hover { color: var(--blue-dark); }

.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(231,236,245,0.82);
}
.header-inner {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.logo, .footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--text);
}
.logo img, .footer-logo img {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    object-fit: cover;
}
.nav-toggle { display: none; }
.nav-toggle-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 9px 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    color: var(--text);
    font-size: 14px;
    font-weight: 700;
    background: var(--white);
}
.site-nav {
    position: absolute;
    top: 70px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--white);
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav { display: flex; }
.nav-link {
    padding: 10px 12px;
    border-radius: 14px;
    color: var(--muted);
    font-size: 14px;
    font-weight: 700;
}
.nav-link:hover, .nav-link.active {
    color: var(--blue);
    background: rgba(41,128,254,0.08);
}

.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;
    font-size: 16px;
    border: 0;
    box-shadow: 0 14px 32px rgba(41, 128, 254, 0.28);
    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 40px rgba(23, 104, 232, 0.30);
}

.vpn-saas-hero {
    position: relative;
    padding: 44px 0 52px;
    color: #fff;
    background: var(--gradient);
    overflow: hidden;
}
.vpn-saas-hero::after {
    content: "";
    position: absolute;
    inset: auto -10% -15% -10%;
    height: 34%;
    background: #FBFCFF;
    transform: skewY(-4deg);
    transform-origin: left top;
}
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-copy h1, .hero-copy p { color: #fff; }
.hero-copy p { font-size: 17px; max-width: 620px; opacity: .92; }
.hero-actions { margin: 26px 0 18px; }
.hero-tags, .floating-tags, .pill-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.hero-tags span, .floating-tags span, .pill-row span {
    display: inline-flex;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    border: 1px solid rgba(255,255,255,0.18);
}
.hero-visual {
    position: relative;
    border-radius: 36px;
    padding: 18px;
    background: rgba(255,255,255,0.14);
    border: 1px solid rgba(255,255,255,0.22);
    box-shadow: 0 30px 80px rgba(19, 27, 66, .22);
}
.hero-visual img {
    width: 100%;
    border-radius: 28px;
    background: rgba(255,255,255,0.2);
}
.floating-card {
    position: absolute;
    right: 12px;
    bottom: 12px;
    max-width: 220px;
    padding: 14px;
    border-radius: 20px;
    background: rgba(255,255,255,0.94);
    color: var(--text);
    box-shadow: var(--shadow);
}
.floating-card strong { display: block; margin-bottom: 4px; }
.floating-card span { display: block; color: var(--muted); font-size: 13px; line-height: 1.5; }
.floating-tags { position: absolute; left: 12px; top: 12px; }

.product-highlights {
    position: relative;
    z-index: 2;
    margin-top: -36px;
}
.highlight-grid, .feature-grid, .risk-grid, .faq-grid, .info-grid {
    display: grid;
    gap: 18px;
}
.highlight-card, .feature-card, .risk-card, .faq-item, .info-card, .step-card, .notice-card {
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--white);
    padding: 24px;
    box-shadow: 0 14px 44px rgba(21, 41, 88, 0.06);
}
.highlight-card .tag, .feature-card .tag, .risk-card .tag {
    display: inline-flex;
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
    margin-bottom: 10px;
}
.highlight-card p, .feature-card p, .risk-card p { font-size: 15px; }

.split-section {
    display: grid;
    gap: 28px;
    align-items: center;
}
.panel {
    border-radius: var(--radius-lg);
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 26px;
}
.image-panel {
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, #F4F8FF, #FFFFFF);
    padding: 18px;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.image-panel img { border-radius: 24px; width: 100%; }
.check-list {
    list-style: none;
    padding: 0;
    margin: 20px 0 0;
    display: grid;
    gap: 12px;
}
.check-list li {
    position: relative;
    padding-left: 28px;
    color: var(--muted);
}
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 7px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--blue);
    box-shadow: inset 0 0 0 4px #DDEBFF;
}

.vpn-connection-section .panel,
.high-speed-section .panel,
.global-nodes-section .panel,
.multi-device-section .panel,
.encryption-protocol-section .panel { min-height: 100%; }
.high-speed-section { background: linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 100%); }
.global-nodes-section .node-card {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}
.node-card span {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    padding: 12px 14px;
    border-radius: 16px;
    background: var(--soft-blue);
    color: var(--muted);
}
.privacy-protection-section .privacy-board {
    display: grid;
    gap: 18px;
    align-items: center;
}
.privacy-mini-grid {
    display: grid;
    gap: 14px;
    margin-top: 20px;
}
.privacy-mini {
    padding: 16px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: #fff;
}
.no-log-policy-section .policy-strip {
    border-radius: var(--radius-lg);
    border: 1px solid var(--line);
    background: var(--white);
    box-shadow: var(--shadow);
    padding: 24px;
}
.protocol-grid {
    display: grid;
    gap: 14px;
    margin-top: 18px;
}
.protocol-item {
    padding: 16px;
    border-radius: 20px;
    background: #F6F9FF;
    border-left: 4px solid var(--blue);
}

.process-steps {
    display: grid;
    gap: 16px;
    counter-reset: steps;
}
.step-card {
    position: relative;
    padding-left: 72px;
}
.step-card::before {
    counter-increment: steps;
    content: counter(steps, decimal-leading-zero);
    position: absolute;
    left: 22px;
    top: 24px;
    width: 34px;
    height: 34px;
    border-radius: 12px;
    background: var(--gradient);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 900;
    font-size: 13px;
}
.risk-card {
    border-top: 4px solid var(--blue);
}
.risk-card strong { display: block; margin-bottom: 8px; }
.risk-card em { display: block; font-style: normal; color: var(--muted); font-size: 14px; }
.faq-item h3 { margin-bottom: 8px; font-size: 18px; }
.cta-section {
    padding: 72px 0;
    background: var(--gradient);
    color: #fff;
    text-align: center;
}
.cta-box {
    width: min(820px, calc(100% - 36px));
    margin: 0 auto;
}
.cta-box h2, .cta-box p { color: #fff; }
.cta-box p { opacity: .92; }
.cta-box .download-btn { margin-top: 12px; }

.page-hero {
    background: linear-gradient(180deg, #F4F8FF 0%, #FFFFFF 100%);
    padding: 54px 0 36px;
    border-bottom: 1px solid var(--line);
}
.page-hero-inner {
    width: min(920px, calc(100% - 36px));
    margin: 0 auto;
}
.page-hero h1 { font-size: clamp(32px, 6vw, 52px); }
.page-summary { font-size: 17px; margin-top: 16px; }
.content-layout {
    width: min(1120px, calc(100% - 36px));
    margin: 0 auto;
    padding: 44px 0 70px;
    display: grid;
    gap: 24px;
}
.article-panel h2 { margin: 8px 0 12px; }
.article-panel {
    border-radius: var(--radius-lg);
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 26px;
}
.sidebar-card {
    border-radius: var(--radius-lg);
    background: #F7FAFF;
    border: 1px solid var(--line);
    padding: 24px;
}
.sidebar-card ul, .article-panel ul, .article-panel ol {
    margin: 12px 0 0;
    padding-left: 20px;
    color: var(--muted);
}
.sidebar-card li, .article-panel li { margin-bottom: 8px; }
.action-panel {
    margin-top: 22px;
    padding: 22px;
    border-radius: 24px;
    background: var(--soft-blue);
    border: 1px solid #DCEAFF;
}
.download-page .download-focus {
    text-align: center;
    padding: 32px;
    border-radius: var(--radius-lg);
    background: var(--white);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.download-page .download-focus .download-btn { margin-top: 12px; }
.steps-list {
    display: grid;
    gap: 14px;
    margin-top: 20px;
}
.steps-list .step-line {
    display: grid;
    grid-template-columns: 38px 1fr;
    gap: 12px;
    align-items: start;
    padding: 16px;
    border-radius: 18px;
    background: #F8FAFE;
    border: 1px solid var(--line);
}
.step-num {
    width: 38px;
    height: 38px;
    border-radius: 14px;
    background: var(--blue);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 900;
}

.site-footer {
    background: #111827;
    color: #D8DEE9;
    padding-top: 52px;
}
.site-footer p, .site-footer a { color: #AEB7C7; }
.site-footer a { display: block; margin-top: 8px; }
.site-footer h3 { color: #fff; font-size: 16px; margin-bottom: 12px; }
.footer-logo span { color: #fff; }
.footer-grid {
    display: grid;
    gap: 28px;
}
.footer-bottom {
    margin-top: 36px;
    padding: 18px;
    border-top: 1px solid rgba(255,255,255,.08);
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: center;
    text-align: center;
    color: #AEB7C7;
    font-size: 13px;
}

@media (min-width: 700px) {
    .highlight-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .feature-grid, .risk-grid, .faq-grid, .info-grid, .privacy-mini-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 980px) {
    .nav-toggle-label { display: none; }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: flex-end;
        gap: 2px;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }
    .hero-grid, .split-section, .privacy-board, .content-layout {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    }
    .hero-grid { gap: 54px; }
    .vpn-saas-hero { padding: 82px 0 112px; }
    .product-highlights { margin-top: -76px; }
    .highlight-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .feature-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .content-layout { align-items: start; }
    .article-panel { padding: 34px; }
    .sidebar-card { position: sticky; top: 98px; }
    .section { padding: 88px 0; }
}