:root {
    --primary: #2980FE;
    --primary-dark: #1768E8;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --text: #1f2937;
    --muted: #667085;
    --light: #f5f7fb;
    --line: #e5eaf3;
    --card: #ffffff;
    --radius: 26px;
    --shadow: 0 18px 50px rgba(38, 56, 120, .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: #fff;
    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: 50;
    background: rgba(255, 255, 255, .94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 70px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: #111827; }
.logo-img { width: 38px; height: 38px; object-fit: cover; border-radius: 12px; box-shadow: 0 8px 18px rgba(41, 128, 254, .18); }
.brand-text { font-size: 18px; letter-spacing: .2px; }
.nav-toggle { border: 1px solid var(--line); background: #fff; color: var(--text); border-radius: 999px; padding: 8px 14px; font-weight: 700; }
.site-nav { display: none; position: absolute; top: 70px; left: 16px; right: 16px; background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 10px; box-shadow: var(--shadow); }
.site-nav.open { display: grid; gap: 4px; }
.site-nav a { padding: 10px 12px; border-radius: 12px; color: var(--muted); font-size: 14px; font-weight: 700; }
.site-nav a.active, .site-nav a:hover { color: var(--primary); background: #eef5ff; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    background: var(--primary);
    color: #fff;
    border-radius: 999px;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(41, 128, 254, .24);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 18px 36px rgba(23, 104, 232, .28); }
.connection-workspace-hero { padding: 48px 0 34px; background: var(--gradient); color: #fff; position: relative; overflow: hidden; }
.connection-workspace-hero:before, .cta-section:before {
    content: "";
    position: absolute;
    inset: -120px -80px auto auto;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: rgba(255,255,255,.18);
    filter: blur(6px);
}
.hero-grid { display: grid; gap: 28px; align-items: center; position: relative; z-index: 1; }
.hero-copy h1 { margin: 0 0 14px; font-size: clamp(34px, 8vw, 64px); line-height: 1.08; letter-spacing: -1px; }
.hero-copy p { margin: 0 0 20px; color: rgba(255,255,255,.88); font-size: 17px; max-width: 640px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 0; }
.hero-tags span, .status-pill, .badge, .mini-label { display: inline-flex; align-items: center; gap: 6px; border-radius: 999px; font-weight: 800; }
.hero-tags span { padding: 7px 12px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.22); }
.workspace-visual { position: relative; min-height: 320px; }
.product-frame { background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.28); border-radius: 34px; padding: 20px; box-shadow: 0 24px 70px rgba(18, 28, 90, .26); }
.product-frame img { border-radius: 24px; margin: 0 auto; }
.status-panel { background: rgba(255,255,255,.94); color: var(--text); border-radius: 24px; padding: 18px; box-shadow: var(--shadow); border: 1px solid rgba(255,255,255,.6); }
.hero-status { margin-top: 18px; }
.status-row { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
.status-row:last-child { border-bottom: 0; }
.status-row strong { color: var(--text); }
.status-pill { background: #eaf3ff; color: var(--primary); padding: 6px 10px; font-size: 13px; }
.section { padding: 54px 0; }
.section.alt { background: var(--light); }
.section-head { margin-bottom: 24px; max-width: 760px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.section-head h2, .page-hero h1 { margin: 0 0 10px; font-size: clamp(26px, 5vw, 42px); line-height: 1.18; letter-spacing: -.5px; }
.section-head p, .page-hero p, .card p, .content-card p { color: var(--muted); margin: 0; }
.quick-task-entries, .risk-grid, .scenario-grid, .faq-grid { display: grid; gap: 16px; }
.quick-card, .card, .capability-card, .risk-card, .faq-item, .content-card, .side-panel, .step-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 12px 32px rgba(30, 44, 92, .06);
}
.quick-card, .card, .capability-card, .risk-card, .faq-item, .step-card { padding: 20px; }
.quick-card h3, .card h3, .capability-card h3, .risk-card h3, .step-card h3 { margin: 8px 0 8px; font-size: 20px; }
.mini-label { color: var(--primary); background: #eef5ff; padding: 5px 10px; font-size: 12px; }
.text-link { color: var(--primary); font-weight: 800; display: inline-flex; margin-top: 14px; }
.connection-capability-overview { display: grid; gap: 16px; }
.capability-card.featured { background: linear-gradient(180deg, #fff 0%, #f3f7ff 100%); }
.feature-grid, .split-section, .route-layout, .device-layout, .data-grid, .checkup-layout { display: grid; gap: 20px; align-items: center; }
.visual-card { border-radius: 30px; background: #f0f5ff; padding: 18px; border: 1px solid var(--line); }
.visual-card img { border-radius: 24px; margin: 0 auto; }
.bullet-list, .check-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 10px; }
.bullet-list li, .check-list li { position: relative; padding-left: 28px; color: #344054; }
.bullet-list li:before, .check-list li:before { content: ""; position: absolute; left: 0; top: .62em; width: 10px; height: 10px; background: var(--primary); border-radius: 50%; box-shadow: 0 0 0 5px #eaf3ff; }
.tunnel-panel { background: #fff; border: 1px solid var(--line); border-radius: 34px; padding: 22px; box-shadow: var(--shadow); }
.tunnel-cards { display: grid; gap: 14px; margin-top: 18px; }
.route-status { display: grid; gap: 12px; }
.route-line { padding: 16px; border-radius: 18px; background: #fff; border: 1px solid var(--line); display: flex; justify-content: space-between; gap: 16px; align-items: center; }
.progress { width: 110px; height: 8px; background: #e8eef9; border-radius: 999px; overflow: hidden; }
.progress span { display: block; height: 100%; background: var(--primary); border-radius: inherit; }
.device-stack { display: grid; gap: 14px; }
.device-card { background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 16px; }
.data-card { padding: 22px; }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding-top: 26px; }
.step-number { width: 36px; height: 36px; border-radius: 50%; background: var(--primary); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-weight: 900; margin-bottom: 10px; }
.risk-card { border-top: 4px solid var(--primary); }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.cta-section { position: relative; overflow: hidden; background: var(--gradient); color: #fff; padding: 48px 0; border-radius: 36px; margin: 30px auto 64px; }
.cta-inner { position: relative; z-index: 1; text-align: center; max-width: 720px; margin: 0 auto; padding: 0 18px; }
.cta-inner h2 { font-size: clamp(26px, 5vw, 42px); line-height: 1.2; margin: 0 0 12px; }
.cta-inner p { color: rgba(255,255,255,.88); margin: 0 0 20px; }
.page-hero { padding: 48px 0; background: linear-gradient(180deg, #f3f7ff 0%, #fff 100%); }
.page-hero-inner { max-width: 820px; }
.badge { color: var(--primary); background: #eef5ff; padding: 7px 12px; font-size: 13px; margin-bottom: 14px; }
.content-layout { display: grid; gap: 22px; padding: 48px 0 70px; }
.content-card, .side-panel { padding: 24px; }
.content-card h2, .side-panel h2 { margin: 0 0 12px; font-size: 24px; }
.long-form p + p { margin-top: 14px; }
.info-grid { display: grid; gap: 14px; margin-top: 22px; }
.info-box { background: #f8fafc; border: 1px solid var(--line); border-radius: 20px; padding: 16px; }
.info-box h3 { margin: 0 0 6px; }
.page-actions { margin-top: 22px; }
.download-page-steps { display: grid; gap: 14px; margin-top: 24px; }
.download-step { display: flex; gap: 14px; align-items: flex-start; padding: 16px; border-radius: 20px; background: #f8fafc; border: 1px solid var(--line); }
.download-step span { flex: 0 0 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 900; }
.site-footer { background: #101828; color: #d0d5dd; padding: 46px 0 24px; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { font-size: 22px; color: #fff; font-weight: 900; margin-bottom: 8px; }
.site-footer h3 { color: #fff; margin: 0 0 10px; font-size: 16px; }
.site-footer a { display: block; color: #d0d5dd; margin: 8px 0; }
.site-footer p { margin: 0; color: #98a2b3; }
.footer-bottom { margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); display: flex; flex-direction: column; gap: 8px; color: #98a2b3; font-size: 14px; }
@media (min-width: 680px) {
    .quick-task-entries, .risk-grid, .scenario-grid, .faq-grid, .info-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.3fr 1fr 1fr 1fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}
@media (min-width: 920px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; align-items: center; gap: 2px; padding: 0; box-shadow: none; border: 0; background: transparent; }
    .site-nav a { padding: 9px 10px; }
    .connection-workspace-hero { padding: 70px 0 58px; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; gap: 40px; }
    .hero-status { position: absolute; right: 2px; bottom: -22px; width: 280px; margin: 0; }
    .quick-task-entries { grid-template-columns: repeat(4, 1fr); margin-top: -28px; position: relative; z-index: 2; }
    .connection-capability-overview { grid-template-columns: repeat(4, 1fr); }
    .capability-card.featured { grid-column: span 2; min-height: 220px; }
    .split-section, .route-layout, .device-layout, .checkup-layout { grid-template-columns: 1fr 1fr; gap: 34px; }
    .feature-grid { grid-template-columns: 1.2fr .8fr; gap: 24px; }
    .tunnel-cards { 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(3, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .content-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
    .content-card, .side-panel { padding: 30px; }
}