:root {
    --primary: #2980FE;
    --primary-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --soft: #f5f7fb;
    --line: #e6ebf2;
    --card: #ffffff;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --radius-lg: 30px;
    --radius-md: 22px;
    --shadow: 0 18px 45px rgba(38, 68, 122, 0.12);
}
* { 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;
    background: #f8fafc;
    color: var(--text);
    line-height: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(230,235,242,.9);
}
.nav-wrap {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 12px 0;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #172033; white-space: nowrap; }
.brand img { width: 42px; height: 42px; border-radius: 14px; object-fit: cover; box-shadow: 0 8px 18px rgba(41,128,254,.18); }
.site-nav { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 8px; font-size: 14px; }
.site-nav a { padding: 8px 11px; border-radius: 999px; color: #475467; }
.site-nav a:hover, .site-nav a.active { background: #eef5ff; color: var(--primary); }
main { background: linear-gradient(180deg, #f8fbff 0%, #ffffff 38%, #f8fafc 100%); }
.section { padding: 64px 0; }
.section-title { margin: 0 0 14px; font-size: clamp(28px, 4vw, 44px); line-height: 1.15; letter-spacing: -0.04em; }
.section-lead { margin: 0; max-width: 720px; color: var(--muted); font-size: 17px; }
.badge, .tag, .mini-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    background: #edf5ff;
    border: 1px solid #d7e8ff;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(41,128,254,.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 16px 34px rgba(23,104,232,.30); }
.link-arrow { color: var(--primary); font-weight: 800; display: inline-flex; margin-top: 12px; }
.connection-workspace-hero {
    padding: 44px 0 58px;
    background: var(--gradient);
    color: #fff;
    border-radius: 0 0 34px 34px;
    position: relative;
    overflow: hidden;
}
.connection-workspace-hero::before, .cta-section::before {
    content: "";
    position: absolute;
    inset: auto -10% -40% auto;
    width: 520px;
    height: 520px;
    background: rgba(255,255,255,.18);
    border-radius: 50%;
    filter: blur(6px);
}
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 32px; align-items: center; position: relative; z-index: 1; }
.hero-copy h1 { margin: 18px 0 16px; font-size: clamp(36px, 8vw, 66px); line-height: 1.04; letter-spacing: -0.055em; }
.hero-copy p { color: rgba(255,255,255,.88); font-size: 18px; max-width: 650px; margin: 0 0 24px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.hero-tags span { padding: 8px 13px; border-radius: 999px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.25); font-size: 13px; }
.hero-visual { position: relative; padding: 18px; }
.visual-card { background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.28); border-radius: 34px; padding: 24px; backdrop-filter: blur(12px); box-shadow: 0 30px 60px rgba(14,23,63,.22); }
.visual-card img { width: min(420px, 100%); margin: 0 auto; border-radius: 28px; }
.status-panel {
    margin-top: 16px;
    background: rgba(255,255,255,.96);
    color: #1d2939;
    border-radius: 24px;
    padding: 18px;
    box-shadow: var(--shadow);
}
.status-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 9px 0; border-bottom: 1px solid #edf1f7; }
.status-row:last-child { border-bottom: none; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 6px rgba(41,128,254,.12); }
.quick-task-entries { margin-top: -28px; position: relative; z-index: 2; }
.quick-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.quick-card, .task-card, .capability-card, .info-card, .risk-card, .faq-item, .step-card, .feature-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 10px 28px rgba(31,41,55,.06);
}
.quick-card h3, .task-card h3, .capability-card h3, .info-card h3, .risk-card h3, .step-card h3, .feature-card h3 { margin: 10px 0 8px; font-size: 20px; }
.quick-card p, .task-card p, .capability-card p, .info-card p, .risk-card p, .step-card p, .feature-card p { margin: 0; color: var(--muted); }
.connection-capability-overview { background: #fff; }
.capability-grid { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 26px; }
.capability-card.large { background: linear-gradient(180deg, #ffffff 0%, #f1f6ff 100%); border-color: #dceaff; }
.split-section { display: grid; grid-template-columns: 1fr; gap: 24px; align-items: center; }
.panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow);
}
.panel.soft { background: #f7faff; }
.panel.gradient-line { border-top: 5px solid var(--primary); }
.media-frame { background: linear-gradient(180deg, #eef4ff 0%, #ffffff 100%); border: 1px solid #dfe9f7; border-radius: 34px; padding: 22px; }
.media-frame img { border-radius: 26px; margin: 0 auto; }
.check-list, .plain-list { padding: 0; margin: 18px 0 0; list-style: none; display: grid; gap: 10px; }
.check-list li, .plain-list li { display: flex; gap: 10px; color: #475467; }
.check-list li::before { content: ""; width: 9px; height: 9px; margin-top: 10px; flex: 0 0 9px; border-radius: 50%; background: var(--primary); }
.encrypted-tunnel-section { background: #f4f7fb; }
.security-grid, .data-grid, .scenario-grid, .risk-grid, .faq-grid { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 24px; }
.route-optimization-section .route-board { background: linear-gradient(135deg, #ffffff 0%, #f1f6ff 100%); }
.route-lines { display: grid; gap: 12px; margin-top: 18px; }
.route-line { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: center; padding: 12px 14px; background: #fff; border-radius: 16px; border: 1px solid var(--line); }
.progress { height: 8px; border-radius: 999px; background: #e8eef8; overflow: hidden; }
.progress span { display: block; height: 100%; background: var(--primary); border-radius: 999px; }
.device-protection-section { background: #fff; }
.device-stack { display: grid; grid-template-columns: 1fr; gap: 14px; }
.device-card { border-radius: 22px; padding: 18px; background: #f7faff; border: 1px solid #e2ebf7; }
.data-boundary-section { background: #f8fafc; }
.process-steps { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 26px; }
.step-num { display: inline-flex; width: 38px; height: 38px; align-items: center; justify-content: center; border-radius: 14px; background: #eef5ff; color: var(--primary); font-weight: 900; }
.risk-card { border-left: 4px solid var(--primary); }
.risk-card strong { display: block; margin-top: 10px; color: #344054; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section { position: relative; overflow: hidden; background: var(--gradient); color: #fff; border-radius: 34px; padding: 44px 24px; text-align: center; margin: 42px auto 70px; }
.cta-section h2 { margin: 0 0 12px; font-size: clamp(28px, 5vw, 44px); }
.cta-section p { margin: 0 auto 24px; max-width: 650px; color: rgba(255,255,255,.88); }
.page-hero { padding: 58px 0 30px; background: linear-gradient(180deg, #eef5ff 0%, #ffffff 100%); }
.page-hero.compact .container, .page-hero .container { display: grid; gap: 18px; }
.page-hero h1 { margin: 6px 0 0; font-size: clamp(34px, 7vw, 58px); line-height: 1.08; letter-spacing: -0.045em; }
.page-hero p { margin: 0; max-width: 780px; color: var(--muted); font-size: 17px; }
.page-layout { display: grid; grid-template-columns: 1fr; gap: 24px; padding: 42px 0 72px; }
.article-panel { background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 26px; box-shadow: var(--shadow); }
.article-panel h2 { margin-top: 0; font-size: 28px; }
.article-panel p { color: #475467; }
.sidebar { display: grid; gap: 16px; align-content: start; }
.tip-box { background: #f7faff; border: 1px solid #dfe9f7; border-radius: 24px; padding: 20px; }
.tip-box h3 { margin-top: 0; }
.faq-page-list { display: grid; gap: 16px; }
.download-steps { counter-reset: step; display: grid; gap: 14px; margin-top: 24px; }
.download-step { position: relative; padding: 18px 18px 18px 62px; background: #fff; border: 1px solid var(--line); border-radius: 22px; }
.download-step::before { counter-increment: step; content: counter(step); position: absolute; left: 18px; top: 18px; width: 30px; height: 30px; display: grid; place-items: center; border-radius: 12px; background: #eef5ff; color: var(--primary); font-weight: 900; }
.site-footer { background: #101828; color: rgba(255,255,255,.76); padding: 44px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 26px; }
.footer-brand { color: #fff; font-weight: 900; font-size: 22px; margin-bottom: 10px; }
.site-footer h3 { color: #fff; margin: 0 0 10px; font-size: 16px; }
.site-footer a { display: block; color: rgba(255,255,255,.72); margin: 7px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; }
@media (min-width: 640px) {
    .quick-grid, .security-grid, .data-grid, .scenario-grid, .risk-grid, .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .capability-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: 920px) {
    .hero-grid { grid-template-columns: minmax(0, 1.06fr) minmax(380px, .94fr); }
    .quick-grid { grid-template-columns: repeat(4, 1fr); }
    .capability-grid { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(172px, auto); }
    .capability-card.large { grid-column: span 2; grid-row: span 2; }
    .split-section { grid-template-columns: 1fr 1fr; }
    .security-grid { grid-template-columns: repeat(3, 1fr); }
    .data-grid { grid-template-columns: repeat(3, 1fr); }
    .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); }
}
@media (max-width: 760px) {
    .nav-wrap { align-items: flex-start; flex-direction: column; }
    .site-nav { justify-content: flex-start; gap: 6px; }
    .site-nav a { padding: 7px 9px; font-size: 13px; }
    .section { padding: 46px 0; }
    .panel, .article-panel { padding: 22px; border-radius: 24px; }
    .download-btn { width: 100%; }
    .cta-section .download-btn, .hero-copy .download-btn, .page-hero .download-btn { width: auto; min-width: 160px; }
    .hero-visual { padding: 0; }
}