:root {
    --gradient-main: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-hover: #1768E8;
    --text: #1E2736;
    --muted: #657084;
    --light: #F5F7FB;
    --soft-blue: #EFF5FF;
    --border: #E6EBF3;
    --white: #FFFFFF;
    --shadow: 0 18px 50px rgba(38, 62, 110, 0.12);
    --radius-lg: 32px;
    --radius-md: 24px;
    --container: 1160px;
}

* { 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: #fff;
    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(18px);
    border-bottom: 1px solid rgba(230, 235, 243, 0.78);
}
.nav-wrap {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
    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; color: var(--text); }
.brand-logo { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 22px rgba(41,128,254,0.18); }
.brand-text { font-size: 20px; letter-spacing: 0.04em; }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label {
    width: 42px;
    height: 42px;
    border: 1px solid var(--border);
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: var(--white);
}
.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
    content: "";
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 999px;
    position: relative;
}
.nav-toggle-label span::before { position: absolute; top: -6px; }
.nav-toggle-label span::after { position: absolute; top: 6px; }
.site-nav {
    position: absolute;
    top: 68px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav { display: flex; }
.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #3A4658;
    font-size: 15px;
}
.site-nav a:hover,
.site-nav a.active { color: var(--blue); background: var(--soft-blue); }
.site-main { min-height: 60vh; }

.container { width: min(100% - 32px, var(--container)); margin: 0 auto; }
.narrow-container { width: min(100% - 32px, 880px); margin: 0 auto; }
.section { padding: 70px 0; }
.section-soft { background: var(--light); }
.section-title { max-width: 760px; margin-bottom: 30px; }
.section-title.center { text-align: center; margin-left: auto; margin-right: auto; }
.eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--blue);
    background: rgba(41,128,254,0.10);
    border: 1px solid rgba(41,128,254,0.16);
    border-radius: 999px;
    padding: 5px 12px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 14px;
}
h1, h2, h3 { line-height: 1.22; margin: 0 0 14px; color: var(--text); }
h1 { font-size: clamp(34px, 8vw, 62px); letter-spacing: -0.04em; }
h2 { font-size: clamp(26px, 5vw, 42px); letter-spacing: -0.03em; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.lead { font-size: 18px; color: #EAF0FF; max-width: 620px; }
.sublead { font-size: 17px; color: #556174; }

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 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 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 18px 36px rgba(23,104,232,0.28); }
.text-link { color: var(--blue); font-weight: 700; }
.text-link:hover { color: var(--blue-hover); }
.link-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }

.vpn-saas-hero {
    width: min(100% - 24px, 1280px);
    margin: 24px auto 0;
    padding: 58px 0;
    border-radius: 38px;
    background: var(--gradient-main);
    color: #fff;
    position: relative;
    overflow: hidden;
}
.vpn-saas-hero::after {
    content: "";
    position: absolute;
    inset: auto -10% -22% 36%;
    height: 230px;
    background: rgba(255,255,255,0.18);
    transform: skewY(-8deg);
    border-radius: 60px;
}
.hero-inner {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
    display: grid;
    gap: 36px;
    align-items: center;
    position: relative;
    z-index: 2;
}
.hero-copy h1 { color: #fff; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-top: 26px; }
.hero-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.hero-tags span, .tag-row span, .mini-tag {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    padding: 5px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.20);
    font-size: 13px;
    font-weight: 700;
}
.hero-visual {
    position: relative;
    min-height: 360px;
    display: grid;
    place-items: center;
}
.app-shell {
    width: min(420px, 88vw);
    padding: 18px;
    border-radius: 36px;
    background: rgba(255,255,255,0.18);
    border: 1px solid rgba(255,255,255,0.22);
    box-shadow: 0 30px 80px rgba(14, 25, 80, 0.25);
    backdrop-filter: blur(14px);
}
.app-shell img { border-radius: 28px; width: 100%; object-fit: cover; }
.float-card {
    position: absolute;
    padding: 12px 16px;
    border-radius: 18px;
    background: rgba(255,255,255,0.94);
    color: #243047;
    box-shadow: 0 18px 40px rgba(18,34,82,0.18);
    font-weight: 800;
    font-size: 14px;
}
.float-card small { display: block; color: var(--muted); font-weight: 600; font-size: 12px; }
.float-card.one { top: 22px; left: 6px; }
.float-card.two { right: 0; top: 78px; }
.float-card.three { left: 2px; bottom: 70px; }
.float-card.four { right: 18px; bottom: 18px; }

.product-highlights {
    display: grid;
    gap: 16px;
}
.highlight-card, .feature-card, .risk-card, .faq-item, .info-card, .step-card, .check-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: 0 12px 34px rgba(45, 61, 94, 0.06);
}
.highlight-card .label, .feature-card .label {
    display: inline-block;
    color: var(--blue);
    font-weight: 800;
    font-size: 13px;
    margin-bottom: 12px;
}
.highlight-card p, .feature-card p { font-size: 15px; }

.split-section, .vpn-connection-section, .high-speed-section, .global-nodes-section, .multi-device-section {
    display: grid;
    gap: 28px;
    align-items: center;
}
.feature-panel {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow);
}
.image-panel {
    border-radius: var(--radius-lg);
    padding: 18px;
    background: linear-gradient(180deg, #FFFFFF 0%, #F3F6FF 100%);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.image-panel img { width: 100%; border-radius: 24px; }
.bullet-list, .plain-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 10px; }
.bullet-list li, .plain-list li {
    color: #4A5668;
    padding-left: 24px;
    position: relative;
}
.bullet-list li::before, .plain-list li::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--blue);
    position: absolute;
    left: 0;
    top: 0.75em;
}

.high-speed-section .feature-panel { background: linear-gradient(180deg, #FFFFFF 0%, #F8FBFF 100%); }
.speed-meter {
    display: grid;
    gap: 12px;
    margin: 20px 0;
}
.speed-line { height: 12px; border-radius: 999px; background: #E9EEF8; overflow: hidden; }
.speed-line span { display: block; height: 100%; width: 72%; background: var(--blue); border-radius: inherit; }
.speed-line:nth-child(2) span { width: 58%; }
.speed-line:nth-child(3) span { width: 86%; }

.global-nodes-section .node-list { display: grid; gap: 12px; margin-top: 18px; }
.node-item { padding: 15px; border-radius: 18px; background: var(--soft-blue); color: #33445E; font-weight: 700; }

.privacy-protection-section {
    background: linear-gradient(180deg, #F7F9FE 0%, #FFFFFF 100%);
}
.privacy-grid, .no-log-grid, .protocol-grid, .risk-grid, .faq-grid, .card-grid { display: grid; gap: 16px; }
.privacy-board {
    display: grid;
    gap: 22px;
    align-items: center;
}
.privacy-board .image-panel { background: #fff; }
.no-log-policy-section .feature-card { border-top: 4px solid var(--blue); }
.protocol-panel {
    border-radius: var(--radius-lg);
    background: #101B31;
    color: #fff;
    padding: 28px;
    position: relative;
    overflow: hidden;
}
.protocol-panel::after {
    content: "";
    position: absolute;
    width: 220px;
    height: 220px;
    right: -60px;
    bottom: -80px;
    background: rgba(41,128,254,0.22);
    border-radius: 50%;
}
.protocol-panel h2, .protocol-panel h3 { color: #fff; }
.protocol-panel p { color: #D5DEF0; }
.protocol-grid .feature-card { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.12); box-shadow: none; }
.protocol-grid .feature-card p { color: #D5DEF0; }

.process-steps {
    display: grid;
    gap: 16px;
    counter-reset: step;
}
.step-card { position: relative; padding-top: 56px; }
.step-number {
    position: absolute;
    top: 20px;
    left: 24px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
}
.safety-panel {
    border-radius: var(--radius-lg);
    background: #fff;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 26px;
}
.risk-card { border-left: 4px solid var(--blue); }
.risk-card strong { display: block; color: var(--text); margin-bottom: 8px; }
.faq-item h3 { font-size: 18px; }

.cta-section {
    width: min(100% - 24px, 1180px);
    margin: 70px auto;
    border-radius: 38px;
    background: var(--gradient-main);
    color: #fff;
    text-align: center;
    padding: 58px 24px;
    position: relative;
    overflow: hidden;
}
.cta-section h2 { color: #fff; }
.cta-section p { color: #EDF2FF; max-width: 680px; margin-left: auto; margin-right: auto; }
.cta-section .download-btn { margin-top: 18px; background: var(--blue); }

.page-hero {
    padding: 64px 0 36px;
    background: linear-gradient(180deg, #F4F7FF 0%, #FFFFFF 100%);
}
.page-hero .narrow-container { display: grid; gap: 8px; }
.page-summary { font-size: 18px; color: #586579; }
.article-layout { display: grid; gap: 24px; align-items: start; padding: 34px 0 70px; }
.article-main {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: 0 12px 34px rgba(45,61,94,0.06);
}
.article-main h2 { font-size: 26px; margin-top: 28px; }
.article-main h2:first-child { margin-top: 0; }
.side-panel {
    background: #F7FAFF;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 22px;
}
.side-panel a { display: block; color: var(--blue); font-weight: 700; margin-top: 10px; }
.check-list { display: grid; gap: 12px; margin: 18px 0; }
.check-card { box-shadow: none; background: #FBFCFF; }
.download-area { margin-top: 28px; }

.download-page-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 34px;
    padding: 30px;
    box-shadow: var(--shadow);
}
.download-steps { display: grid; gap: 14px; margin: 26px 0; }
.download-step { display: flex; gap: 14px; padding: 16px; background: #F7FAFF; border-radius: 20px; border: 1px solid var(--border); }
.download-step span { width: 32px; height: 32px; flex: 0 0 32px; border-radius: 50%; display: grid; place-items: center; color: #fff; background: var(--blue); font-weight: 800; }

.site-footer { background: #F7F9FC; border-top: 1px solid var(--border); }
.footer-inner { width: min(100% - 32px, var(--container)); margin: 0 auto; padding: 48px 0 34px; display: grid; gap: 28px; }
.footer-brand p { max-width: 440px; margin-top: 14px; }
.footer-grid { display: grid; gap: 24px; }
.footer-grid h3 { font-size: 16px; margin-bottom: 10px; }
.footer-grid a { display: block; color: #5D697B; margin: 7px 0; font-size: 14px; }
.footer-grid a:hover { color: var(--blue); }
.footer-bottom { border-top: 1px solid var(--border); padding: 18px 16px; text-align: center; }
.footer-bottom p { margin: 0; font-size: 14px; }

@media (min-width: 680px) {
    .product-highlights, .privacy-grid, .no-log-grid, .risk-grid, .faq-grid, .card-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
    .nav-toggle-label { display: none; }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 2px;
        padding: 0;
        border: 0;
        border-radius: 0;
        box-shadow: none;
        background: transparent;
    }
    .site-nav a { font-size: 14px; padding: 9px 10px; }
    .hero-inner { grid-template-columns: 1.02fr 0.98fr; }
    .lead { font-size: 19px; }
    .product-highlights { grid-template-columns: repeat(4, 1fr); }
    .split-section, .vpn-connection-section, .high-speed-section, .global-nodes-section, .multi-device-section, .privacy-board { grid-template-columns: repeat(2, 1fr); }
    .no-log-grid, .protocol-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .article-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .footer-inner { grid-template-columns: 1fr 1.45fr; }
    .footer-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 1120px) {
    .site-nav a { padding: 9px 12px; }
    .article-main { padding: 38px; }
}