:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #20283A;
    --muted: #6B7280;
    --light: #F5F7FB;
    --line: #E4E8F0;
    --white: #FFFFFF;
    --radius: 28px;
    --shadow: 0 20px 60px rgba(24, 38, 78, 0.08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", 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: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(228, 232, 240, 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: 16px;
}
.brand, .footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    letter-spacing: -0.02em;
}
.brand-logo, .footer-logo {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    object-fit: cover;
    box-shadow: 0 10px 24px rgba(41, 128, 254, 0.18);
}
.nav-toggle {
    border: 1px solid var(--line);
    background: var(--white);
    color: var(--text);
    border-radius: 14px;
    padding: 9px 14px;
    font-weight: 700;
}
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.site-nav.is-open { display: flex; }
.site-nav a {
    color: #4B5563;
    font-size: 14px;
    font-weight: 700;
    padding: 10px 12px;
    border-radius: 12px;
}
.site-nav a.active, .site-nav a:hover { color: var(--blue); background: #EEF5FF; }
.nav-download { color: var(--blue) !important; }
.container {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}
.section {
    padding: 68px 0;
}
.section-soft { background: #F0F5FF; }
.section-title {
    max-width: 760px;
    margin: 0 0 28px;
}
.section-title.center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}
.eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--blue);
    background: #ECF4FF;
    border: 1px solid #D8E7FF;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 800;
    margin-bottom: 14px;
}
h1, h2, h3 { line-height: 1.18; margin: 0 0 14px; color: #172033; }
h1 { font-size: clamp(34px, 9vw, 64px); letter-spacing: -0.055em; }
h2 { font-size: clamp(26px, 5vw, 42px); letter-spacing: -0.035em; }
h3 { font-size: 21px; letter-spacing: -0.02em; }
p { margin: 0 0 14px; color: var(--muted); }
.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 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, 0.25);
}
.text-link {
    color: var(--blue);
    font-weight: 800;
}
.vpn-saas-hero {
    position: relative;
    overflow: hidden;
    background: var(--gradient);
    color: #fff;
    padding: 72px 0 78px;
}
.vpn-saas-hero:after {
    content: "";
    position: absolute;
    left: -8%;
    right: -8%;
    bottom: -70px;
    height: 150px;
    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: 38px;
    align-items: center;
}
.hero-copy h1, .hero-copy p { color: #fff; }
.hero-copy p { color: rgba(255,255,255,.86); font-size: 18px; max-width: 680px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin: 24px 0; }
.hero-tags, .floating-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span, .floating-tags span {
    color: #fff;
    background: rgba(255,255,255,.14);
    border: 1px solid rgba(255,255,255,.28);
    padding: 8px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}
.hero-visual {
    position: relative;
    min-height: 360px;
    border-radius: 36px;
    padding: 24px;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
    box-shadow: 0 30px 90px rgba(17, 24, 39, .22);
}
.hero-device {
    width: min(460px, 100%);
    margin: 0 auto;
    border-radius: 32px;
    background: #fff;
    box-shadow: 0 28px 70px rgba(10, 16, 45, .28);
}
.float-card {
    position: absolute;
    background: rgba(255,255,255,.94);
    color: #1F2937;
    border-radius: 18px;
    padding: 10px 14px;
    box-shadow: var(--shadow);
    font-size: 13px;
    font-weight: 800;
}
.float-card.one { top: 24px; left: 18px; }
.float-card.two { top: 120px; right: 12px; }
.float-card.three { bottom: 76px; left: 8px; }
.float-card.four { bottom: 18px; right: 28px; }
.product-highlights {
    position: relative;
    z-index: 5;
    margin-top: -46px;
    display: grid;
    gap: 16px;
}
.highlight-card, .feature-card, .risk-card, .faq-item, .step-card, .info-card, .article-card, .aside-card, .policy-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    box-shadow: 0 14px 40px rgba(28, 47, 95, 0.06);
}
.highlight-card span, .feature-card span, .risk-card span {
    display: inline-flex;
    color: var(--blue);
    background: #ECF4FF;
    border-radius: 999px;
    padding: 4px 9px;
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 12px;
}
.feature-split, .vpn-connection-section, .high-speed-section, .global-nodes-section, .multi-device-section, .encryption-protocol-section {
    display: grid;
    gap: 26px;
    align-items: center;
}
.feature-panel {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
}
.feature-list { margin: 18px 0 20px; padding: 0; list-style: none; display: grid; gap: 10px; }
.feature-list li {
    position: relative;
    padding-left: 24px;
    color: #4B5563;
}
.feature-list li:before {
    content: "";
    width: 8px;
    height: 8px;
    background: var(--blue);
    border-radius: 50%;
    position: absolute;
    left: 3px;
    top: 12px;
}
.image-card {
    position: relative;
    overflow: hidden;
    border-radius: 34px;
    background: linear-gradient(145deg, #FFFFFF, #EEF4FF);
    border: 1px solid var(--line);
    padding: 22px;
    box-shadow: var(--shadow);
}
.image-card img { width: 100%; border-radius: 24px; }
.node-list, .mini-grid, .policy-grid, .risk-grid, .faq-grid, .article-grid {
    display: grid;
    gap: 16px;
}
.node-list { grid-template-columns: 1fr; }
.node-pill {
    background: #F7FAFF;
    border: 1px solid #E4ECF8;
    border-radius: 18px;
    padding: 14px;
}
.privacy-protection-section {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 34px;
    padding: 28px;
    box-shadow: var(--shadow);
}
.privacy-layout { display: grid; gap: 24px; align-items: center; }
.privacy-cards, .protocol-cards { display: grid; gap: 14px; margin-top: 18px; }
.no-log-policy-section .policy-card { border-top: 4px solid var(--blue); }
.process-steps {
    display: grid;
    gap: 16px;
}
.step-card .step-num {
    display: inline-flex;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--blue);
    color: #fff;
    font-weight: 900;
    margin-bottom: 12px;
}
.safety-panel {
    background: linear-gradient(180deg, #FFFFFF 0%, #F7FAFF 100%);
    border: 1px solid var(--line);
    border-radius: 34px;
    padding: 26px;
}
.risk-card {
    border-left: 4px solid var(--blue);
}
.risk-card strong { display: block; margin-bottom: 6px; color: #172033; }
.cta-section {
    background: var(--gradient);
    color: #fff;
    border-radius: 36px;
    padding: 42px 24px;
    text-align: center;
    overflow: hidden;
    position: relative;
}
.cta-section h2, .cta-section p { color: #fff; }
.page-hero {
    padding: 62px 0 34px;
    background: linear-gradient(180deg, #F3F7FF 0%, #F7F9FD 100%);
}
.page-hero-inner {
    width: min(920px, calc(100% - 32px));
    margin: 0 auto;
}
.content-layout {
    display: grid;
    gap: 22px;
    width: min(1100px, calc(100% - 32px));
    margin: 0 auto;
}
.content-main {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 24px;
    box-shadow: var(--shadow);
}
.content-main h2 { margin-top: 22px; }
.check-list { padding: 0; margin: 16px 0; list-style: none; display: grid; gap: 12px; }
.check-list li {
    background: #F7FAFF;
    border: 1px solid #E5ECF7;
    border-radius: 16px;
    padding: 12px 14px;
    color: #4B5563;
}
.callout {
    border-radius: 22px;
    background: #ECF4FF;
    border: 1px solid #D7E8FF;
    padding: 18px;
    margin: 18px 0;
    color: #3F4A5F;
}
.download-zone { margin-top: 24px; }
.faq-item h3 { font-size: 18px; }
.site-footer {
    background: #111827;
    color: #D1D5DB;
    padding: 40px 0;
}
.footer-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 22px;
}
.footer-brand p, .footer-note { color: #AAB2C0; margin: 6px 0 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px; }
.footer-links a {
    color: #D1D5DB;
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 999px;
    padding: 8px 12px;
    font-size: 14px;
}
@media (min-width: 680px) {
    .product-highlights, .mini-grid, .policy-grid, .risk-grid, .faq-grid, .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .privacy-cards, .protocol-cards { 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: 2px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .hero-inner { grid-template-columns: 1.04fr .96fr; }
    .product-highlights { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .feature-split, .vpn-connection-section, .high-speed-section, .global-nodes-section, .multi-device-section, .encryption-protocol-section, .privacy-layout {
        grid-template-columns: 1fr 1fr;
    }
    .content-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
    .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .footer-inner { grid-template-columns: 1.2fr .8fr; align-items: center; }
    .footer-note { grid-column: 1 / -1; }
}