:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #6b7280;
    --light: #f5f7fb;
    --soft-blue: #eef5ff;
    --border: #e5e7eb;
    --white: #ffffff;
    --shadow: 0 18px 48px rgba(34, 56, 100, .12);
    --radius: 24px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #ffffff;
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.narrow { max-width: 860px; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(229,231,235,.78);
}
.nav-container {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 22px; color: #233165; }
.logo-img { width: 42px; height: 42px; border-radius: 13px; object-fit: cover; box-shadow: 0 8px 22px rgba(41,128,254,.18); }
.main-nav { display: none; position: absolute; left: 14px; right: 14px; top: 68px; background: #fff; border: 1px solid var(--border); border-radius: 18px; padding: 10px; box-shadow: var(--shadow); }
.main-nav a { display: block; padding: 12px 14px; color: #374151; font-weight: 650; border-radius: 12px; }
.main-nav a:hover, .main-nav a.active { color: var(--blue); background: var(--soft-blue); }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label { width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 13px; display: grid; place-content: center; gap: 5px; cursor: pointer; }
.nav-toggle-label span { display: block; width: 20px; height: 2px; background: #334155; border-radius: 2px; }
.nav-toggle:checked ~ .main-nav { display: block; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    letter-spacing: .02em;
    box-shadow: 0 14px 30px rgba(41,128,254,.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 38px rgba(23,104,232,.28); }
.vpn-dashboard-hero {
    background: var(--gradient);
    color: #fff;
    padding: 52px 0 64px;
    position: relative;
    overflow: hidden;
}
.vpn-dashboard-hero:before, .cta-section:before {
    content: "";
    position: absolute;
    inset: auto -80px -180px auto;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    background: rgba(255,255,255,.17);
    filter: blur(2px);
}
.hero-grid { display: grid; gap: 32px; align-items: center; position: relative; z-index: 1; }
.hero-copy h1 { font-size: clamp(34px, 8vw, 64px); line-height: 1.08; margin: 0 0 18px; letter-spacing: -0.04em; }
.hero-copy p { color: rgba(255,255,255,.88); font-size: 17px; margin: 0 0 24px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span, .security-chip { background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.25); color: #fff; padding: 8px 12px; border-radius: 999px; font-size: 13px; }
.hero-console {
    position: relative;
    display: grid;
    gap: 14px;
}
.product-panel {
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.22);
    border-radius: 30px;
    padding: 18px;
    backdrop-filter: blur(18px);
    box-shadow: 0 24px 60px rgba(15,23,42,.18);
}
.product-panel img { width: 100%; border-radius: 22px; background: rgba(255,255,255,.12); }
.status-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.status-card { background: rgba(255,255,255,.95); color: #1f2937; border-radius: 18px; padding: 14px; box-shadow: 0 16px 34px rgba(25,31,80,.12); }
.status-card strong { display: block; font-size: 15px; }
.status-card span { display: block; color: #6b7280; font-size: 12px; }
.section { padding: 68px 0; }
.section.light { background: var(--light); }
.section-heading { margin-bottom: 28px; }
.section-heading .eyebrow, .category-badge { display: inline-flex; color: var(--blue); background: var(--soft-blue); border: 1px solid #d8e9ff; border-radius: 999px; padding: 6px 12px; font-size: 13px; font-weight: 800; }
.section-heading h2, .page-hero h1 { margin: 12px 0 10px; line-height: 1.2; letter-spacing: -0.025em; }
.section-heading h2 { font-size: clamp(28px, 5vw, 42px); }
.section-heading p, .lead { color: var(--muted); margin: 0; }
.service-index { background: #fff; }
.service-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.service-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 14px 35px rgba(31,41,55,.06);
    transition: transform .2s ease, border-color .2s ease;
}
.service-card:hover { transform: translateY(-4px); border-color: #c9ddff; }
.service-card .tag { color: var(--blue); font-size: 13px; font-weight: 800; }
.service-card h3 { margin: 8px 0; font-size: 21px; }
.service-card p { color: var(--muted); margin: 0 0 14px; }
.text-link { color: var(--blue); font-weight: 800; }
.feature-split, .vpn-connection-section, .global-nodes-section, .high-speed-section, .multi-device-section {
    display: grid;
    gap: 24px;
    align-items: center;
}
.feature-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 24px;
    box-shadow: var(--shadow);
}
.feature-card img { border-radius: 24px; background: var(--soft-blue); }
.feature-content h2 { font-size: clamp(28px, 5vw, 42px); line-height: 1.2; margin: 0 0 12px; }
.feature-content p { color: var(--muted); margin: 0 0 14px; }
.point-list { display: grid; gap: 10px; padding: 0; margin: 20px 0; list-style: none; }
.point-list li { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 12px 14px; color: #374151; }
.light .point-list li { background: #fff; }
.privacy-protection-section, .no-log-policy-section, .encryption-protocol-section, .safety-panel {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 24px;
    box-shadow: var(--shadow);
}
.info-grid, .category-grid { display: grid; gap: 16px; }
.info-card, .risk-card, .faq-item, .step-card, .side-panel, .article-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 20px;
    box-shadow: 0 12px 30px rgba(31,41,55,.05);
}
.info-card h3, .risk-card h3, .faq-item h3, .step-card h3 { margin: 0 0 8px; }
.info-card p, .risk-card p, .faq-item p, .step-card p, .side-panel p, .article-card p { color: var(--muted); margin: 0; }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding-top: 52px; }
.step-card:before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    top: 18px;
    left: 20px;
    color: var(--blue);
    background: var(--soft-blue);
    border-radius: 999px;
    padding: 3px 10px;
    font-size: 12px;
    font-weight: 900;
}
.risk-grid { display: grid; gap: 16px; }
.risk-card { border-left: 4px solid var(--blue); }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { font-size: 18px; }
.cta-section {
    position: relative;
    overflow: hidden;
    background: var(--gradient);
    color: #fff;
    text-align: center;
    padding: 62px 0;
}
.cta-section p { color: rgba(255,255,255,.86); max-width: 700px; margin: 0 auto 24px; }
.cta-section .download-btn { background: var(--blue); color: #fff; }
.page-hero { background: linear-gradient(180deg, #f5f8ff 0%, #fff 100%); padding: 54px 0 34px; }
.page-hero h1 { font-size: clamp(32px, 6vw, 50px); }
.content-page { padding: 38px 0 72px; }
.article-layout { display: grid; gap: 22px; align-items: start; }
.article-card h2 { font-size: 26px; margin: 4px 0 12px; }
.article-card h3 { margin-top: 26px; }
.article-card ul, .article-card ol { color: #4b5563; padding-left: 20px; }
.article-card .download-btn { margin-top: 22px; }
.notice-box, .checklist-box {
    margin-top: 20px;
    background: #f8fbff;
    border: 1px solid #dbeafe;
    border-radius: 20px;
    padding: 18px;
}
.notice-box h3, .checklist-box h3 { margin: 0 0 10px; }
.side-panel { position: static; }
.side-panel a { display: block; color: var(--blue); font-weight: 800; margin-top: 10px; }
.download-steps { display: grid; gap: 14px; margin: 24px 0; }
.download-step { display: flex; gap: 14px; align-items: flex-start; padding: 16px; background: #fff; border: 1px solid var(--border); border-radius: 18px; }
.download-step span { flex: 0 0 auto; width: 32px; height: 32px; border-radius: 50%; background: var(--blue); color: #fff; display: grid; place-items: center; font-weight: 900; }
.site-footer { background: #101827; color: #d1d5db; padding-top: 52px; }
.footer-grid { display: grid; gap: 28px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 900; font-size: 22px; }
.footer-brand img { width: 40px; height: 40px; border-radius: 12px; object-fit: cover; }
.site-footer h3 { color: #fff; margin: 0 0 12px; }
.site-footer a { display: block; color: #d1d5db; margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 36px; padding: 18px; text-align: center; color: #9ca3af; }
@media (min-width: 640px) {
    .service-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .info-grid, .category-grid, .risk-grid, .process-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 900px) {
    .nav-toggle-label { display: none; }
    .main-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .main-nav a { padding: 9px 11px; font-size: 14px; }
    .vpn-dashboard-hero { padding: 78px 0 86px; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; }
    .feature-split, .vpn-connection-section, .global-nodes-section, .high-speed-section, .multi-device-section { grid-template-columns: 1fr 1fr; }
    .feature-split.reverse .feature-card, .high-speed-section .feature-card { order: 2; }
    .service-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .service-card.large { grid-column: span 2; }
    .info-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .article-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .side-panel { position: sticky; top: 92px; }
    .footer-grid { grid-template-columns: 1.3fr repeat(3, 1fr); }
}
@media (min-width: 1100px) {
    .main-nav a { padding: 10px 14px; font-size: 15px; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1120px); }
    .status-grid { grid-template-columns: 1fr; }
    .download-btn { width: 100%; }
    .hero-tags span { flex: 1 1 auto; text-align: center; }
}