/* ============================================================
   RoboticsHub — design system
   ============================================================ */
:root {
  --bg: #0a0d13;
  --bg-2: #0e121b;
  --panel: #121826;
  --panel-2: #161d2e;
  --panel-hover: #1b2436;
  --border: #232c40;
  --border-soft: #1a2233;
  --text: #e6ebf5;
  --text-dim: #9aa6bf;
  --text-faint: #6b7790;
  --accent: #00e0c6;
  --accent-2: #6c8cff;
  --accent-3: #ff7a59;
  --warn: #ffcc55;
  --danger: #ff5c7a;
  --good: #4ee19a;
  --china: #ff5b6e;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 8px 30px rgba(0,0,0,.35);
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
}
[data-theme="light"] {
  --bg: #f4f6fb;
  --bg-2: #eef1f8;
  --panel: #ffffff;
  --panel-2: #f7f9fd;
  --panel-hover: #eef2fa;
  --border: #d9e0ee;
  --border-soft: #e6ebf5;
  --text: #131a2b;
  --text-dim: #51607c;
  --text-faint: #7e8aa3;
  --accent: #00a995;
  --accent-2: #3a5bd9;
  --shadow: 0 8px 30px rgba(60,80,120,.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: radial-gradient(1200px 600px at 80% -10%, rgba(108,140,255,.08), transparent 60%),
              radial-gradient(900px 500px at -10% 10%, rgba(0,224,198,.06), transparent 55%),
              var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15.5px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
h1,h2,h3,h4 { line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
img { max-width: 100%; }
::selection { background: rgba(0,224,198,.28); }

.skip-link { position:absolute; left:-9999px; top:0; background:var(--accent); color:#001; padding:8px 14px; z-index:1000; border-radius:0 0 8px 0; }
.skip-link:focus { left:0; }

/* ---------- Topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 60;
  display: flex; align-items: center; gap: 14px;
  padding: 10px 18px;
  background: color-mix(in srgb, var(--bg-2) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
}
.brand { display:flex; align-items:center; gap:9px; font-weight:800; font-size:18px; color:var(--text); letter-spacing:-.02em; }
.brand:hover { text-decoration:none; }
.brand-mark { display:flex; }
.brand-accent { color: var(--accent); }
.topbar-search { position: relative; flex: 1; max-width: 560px; margin: 0 auto; }
.topbar-search input {
  width: 100%; padding: 10px 14px; border-radius: 10px;
  background: var(--panel); border: 1px solid var(--border);
  color: var(--text); font-size: 14px; outline: none;
}
.topbar-search input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,224,198,.12); }
.search-results {
  position: absolute; top: 46px; left: 0; right: 0; z-index: 80;
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow); max-height: 60vh; overflow-y: auto; padding: 6px;
}
.search-results .sr-group { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); padding: 8px 10px 4px; }
.search-results a { display:block; padding: 8px 10px; border-radius: 8px; color: var(--text); }
.search-results a:hover { background: var(--panel-hover); text-decoration:none; }
.search-results a small { color: var(--text-faint); }
.topbar-actions { display:flex; align-items:center; gap:10px; }
.updated-pill { font-size: 11px; color: var(--text-faint); white-space: nowrap; }
.theme-toggle { background:var(--panel); border:1px solid var(--border); color:var(--text); width:36px; height:36px; border-radius:9px; cursor:pointer; font-size:16px; }
.theme-toggle:hover { background: var(--panel-hover); }
.nav-toggle { display:none; flex-direction:column; gap:4px; background:none; border:none; cursor:pointer; padding:6px; }
.nav-toggle span { width:22px; height:2px; background:var(--text); border-radius:2px; }

/* ---------- Layout ---------- */
.layout { display: grid; grid-template-columns: 240px 1fr; align-items: start; }
.sidebar {
  position: sticky; top: 57px; height: calc(100vh - 57px); overflow-y: auto;
  padding: 16px 12px 30px; border-right: 1px solid var(--border-soft);
  background: linear-gradient(180deg, var(--bg-2), transparent);
}
.nav-section { display:flex; flex-direction:column; gap:2px; margin-bottom: 6px; }
.nav-group-label { font-size: 10.5px; text-transform: uppercase; letter-spacing: .1em; color: var(--text-faint); padding: 12px 12px 5px; }
.nav-link {
  display:flex; align-items:center; gap:8px; padding: 8px 12px; border-radius: 9px;
  color: var(--text-dim); font-size: 14px; font-weight: 500; white-space: nowrap;
}
.nav-link:hover { background: var(--panel-hover); color: var(--text); text-decoration:none; }
.nav-link.active { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--text); box-shadow: inset 2px 0 0 var(--accent); }
.sidebar-footer { margin-top: 20px; padding: 12px; font-size: 12px; color: var(--text-faint); border-top: 1px solid var(--border-soft); }

.content { min-width: 0; padding: 26px clamp(16px, 4vw, 44px) 60px; max-width: var(--maxw); margin: 0 auto; width: 100%; }
.scrim { display:none; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border-soft); background: var(--bg-2); margin-top: 30px; }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 18px 24px; display:flex; justify-content:space-between; gap:14px; flex-wrap:wrap; font-size: 13px; color: var(--text-faint); }

/* ---------- Generic UI ---------- */
.page-head { margin-bottom: 22px; }
.page-head h1 { font-size: clamp(26px, 4vw, 38px); margin: 0 0 8px; }
.page-head .lede { color: var(--text-dim); font-size: 16px; max-width: 70ch; margin: 0; }
.eyebrow { display:inline-block; font-size: 12px; text-transform: uppercase; letter-spacing: .12em; color: var(--accent); font-weight: 700; margin-bottom: 10px; }
.crumbs { font-size: 13px; color: var(--text-faint); margin-bottom: 14px; }
.crumbs a { color: var(--text-dim); }

.grid { display:grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid.auto { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }

.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; transition: border-color .15s, transform .15s, background .15s;
}
a.card:hover { text-decoration:none; border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); transform: translateY(-2px); background: var(--panel-2); }
.card h3 { margin: 0 0 6px; font-size: 17px; color: var(--text); }
.card p { margin: 0; color: var(--text-dim); font-size: 14px; }
.card .card-icon { font-size: 24px; margin-bottom: 8px; display:block; }
.card .card-meta { margin-top: 10px; font-size: 12px; color: var(--text-faint); display:flex; gap:8px; flex-wrap:wrap; }

.tag { display:inline-block; font-size: 11.5px; padding: 3px 9px; border-radius: 999px; background: var(--panel-2); border: 1px solid var(--border); color: var(--text-dim); white-space: nowrap; }
.tag.accent { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.tag.china { color: var(--china); border-color: color-mix(in srgb, var(--china) 40%, var(--border)); }
.tag.live { color: var(--good); }
.tag.sm { font-size: 10.5px; padding: 2px 7px; }

.btn { display:inline-flex; align-items:center; gap:7px; padding: 9px 15px; border-radius: 10px; background: var(--panel); border: 1px solid var(--border); color: var(--text); font-size: 14px; cursor: pointer; font-weight:600; }
.btn:hover { background: var(--panel-hover); text-decoration:none; }
.btn.primary { background: var(--accent); color: #00201c; border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn:disabled { opacity:.55; cursor: default; }

.chips { display:flex; gap:8px; flex-wrap:wrap; margin-bottom: 18px; }
.chip { padding: 7px 13px; border-radius: 999px; border:1px solid var(--border); background:var(--panel); color:var(--text-dim); font-size:13px; cursor:pointer; user-select:none; }
.chip:hover { background: var(--panel-hover); color: var(--text); }
.chip.active { background: color-mix(in srgb, var(--accent) 16%, transparent); border-color: var(--accent); color: var(--text); }

.stat-strip { display:grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 12px; margin: 18px 0 26px; }
.stat { background: var(--panel); border:1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.stat .stat-val { font-size: 24px; font-weight: 800; color: var(--text); letter-spacing:-.02em; }
.stat .stat-label { font-size: 12.5px; color: var(--text-dim); margin-top: 4px; }
.stat a { font-size: 11px; }

.section-title { font-size: 13px; text-transform: uppercase; letter-spacing: .1em; color: var(--text-faint); margin: 30px 0 14px; display:flex; align-items:center; gap:10px; }
.section-title::after { content:""; flex:1; height:1px; background: var(--border-soft); }

/* ---------- Hero (dashboard) ---------- */
.hero {
  border: 1px solid var(--border); border-radius: 20px; padding: clamp(22px, 4vw, 40px);
  background:
    radial-gradient(700px 300px at 90% -20%, rgba(108,140,255,.16), transparent 60%),
    radial-gradient(500px 260px at -5% 120%, rgba(0,224,198,.12), transparent 60%),
    var(--panel);
  margin-bottom: 26px;
}
.hero h1 { font-size: clamp(28px, 5vw, 46px); margin: 0 0 12px; }
.hero h1 .grad { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { font-size: 17px; color: var(--text-dim); max-width: 66ch; margin: 0 0 18px; }
.hero-actions { display:flex; gap:10px; flex-wrap:wrap; }

/* ---------- Article / prose ---------- */
.prose { max-width: 74ch; }
.prose h2 { font-size: 22px; margin: 30px 0 12px; padding-bottom: 6px; border-bottom: 1px solid var(--border-soft); }
.prose h3 { font-size: 17.5px; margin: 22px 0 8px; color: var(--text); }
.prose p { margin: 0 0 14px; color: var(--text); }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 22px; color: var(--text); }
.prose li { margin: 4px 0; }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--panel-2); padding: 2px 6px; border-radius: 6px; border:1px solid var(--border-soft); }
.prose pre { background: var(--panel-2); border:1px solid var(--border); border-radius: 10px; padding: 14px; overflow:auto; }
.prose pre code { background:none; border:none; padding:0; }
.prose blockquote { margin: 0 0 16px; padding: 4px 16px; border-left: 3px solid var(--accent); color: var(--text-dim); background: var(--panel-2); border-radius: 0 8px 8px 0; }
.prose table { border-collapse: collapse; width: 100%; margin: 0 0 16px; font-size: 14px; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 11px; text-align: left; }
.prose th { background: var(--panel-2); }
.prose a { color: var(--accent-2); }

.layout-2col { display:grid; grid-template-columns: 1fr 280px; gap: 30px; align-items:start; }
.aside { position: sticky; top: 74px; }
.aside .card { padding: 16px; margin-bottom: 14px; }
.aside h4 { margin: 0 0 10px; font-size: 13px; text-transform: uppercase; letter-spacing:.08em; color: var(--text-faint); }

/* facts / takeaways */
.facts-list { list-style:none; padding:0; margin:0; }
.facts-list li { padding: 10px 0; border-bottom: 1px dashed var(--border-soft); font-size: 14px; }
.facts-list li:last-child { border-bottom: none; }
.facts-list .fact-src { display:block; font-size: 11.5px; color: var(--text-faint); margin-top: 3px; }
.takeaways { background: color-mix(in srgb, var(--accent) 8%, var(--panel)); border:1px solid color-mix(in srgb, var(--accent) 30%, var(--border)); border-radius: var(--radius); padding: 16px 18px; margin: 18px 0; }
.takeaways h4 { margin:0 0 8px; color: var(--accent); }
.takeaways ul { margin:0; padding-left: 20px; }

/* milestones */
.timeline { position: relative; margin: 10px 0; padding-left: 22px; }
.timeline::before { content:""; position:absolute; left: 6px; top: 4px; bottom: 4px; width: 2px; background: var(--border); }
.tl-item { position: relative; padding: 0 0 18px 6px; }
.tl-item::before { content:""; position:absolute; left: -22px; top: 5px; width: 11px; height: 11px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--bg); }
.tl-date { font-size: 12px; color: var(--accent); font-weight: 700; font-family: var(--mono); }
.tl-title { font-weight: 700; margin: 1px 0 2px; }
.tl-desc { font-size: 14px; color: var(--text-dim); }
.tl-desc a { font-size: 12px; }

/* ---------- News feed ---------- */
.news-controls { display:flex; gap:12px; align-items:center; flex-wrap:wrap; margin-bottom: 16px; }
.news-list { display:flex; flex-direction: column; gap: 10px; }
.news-item {
  display:grid; grid-template-columns: 86px 1fr; gap: 14px; align-items:start;
  background: var(--panel); border:1px solid var(--border); border-radius: 12px; padding: 14px 16px;
}
.news-item:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.news-when { font-size: 11.5px; color: var(--text-faint); font-family: var(--mono); padding-top: 2px; }
.news-body h3 { font-size: 15.5px; margin: 0 0 4px; }
.news-body h3 a { color: var(--text); }
.news-body h3 a:hover { color: var(--accent); }
.news-body .news-sum { font-size: 13.5px; color: var(--text-dim); margin: 0 0 7px; display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }
.news-meta { display:flex; gap:8px; flex-wrap:wrap; align-items:center; font-size: 12px; color: var(--text-faint); }
.news-src { color: var(--accent-2); font-weight: 600; }
.feed-note { font-size: 12.5px; color: var(--text-faint); margin: 8px 0 0; }

/* ---------- tables / directory ---------- */
.toolbar { display:flex; gap:10px; flex-wrap:wrap; align-items:center; margin-bottom: 16px; }
.toolbar input[type="search"], .toolbar select {
  padding: 9px 12px; border-radius: 9px; background: var(--panel); border:1px solid var(--border); color: var(--text); font-size: 14px;
}
.dir-table { width:100%; border-collapse: collapse; font-size: 14px; }
.dir-table th { text-align:left; font-size: 12px; text-transform: uppercase; letter-spacing:.05em; color: var(--text-faint); padding: 10px; border-bottom: 1px solid var(--border); position: sticky; top: 57px; background: var(--bg); cursor:pointer; }
.dir-table td { padding: 11px 10px; border-bottom: 1px solid var(--border-soft); vertical-align: top; }
.dir-table tr:hover td { background: var(--panel-2); }
.muted { color: var(--text-faint); }
.nowrap { white-space: nowrap; }

/* company cards */
.company-card .cc-head { display:flex; justify-content:space-between; gap:10px; align-items:baseline; }
.company-card .cc-name { font-size: 16px; font-weight: 700; }
.company-card .cc-flag { font-size: 12px; color: var(--text-faint); }

/* glossary */
.glossary-term { background: var(--panel); border:1px solid var(--border); border-radius: 11px; padding: 14px 16px; }
.glossary-term dt { font-weight: 700; font-size: 15px; }
.glossary-term dt .abbrev { color: var(--accent); font-weight: 600; font-size: 13px; margin-left:6px; }
.glossary-term dd { margin: 5px 0 0; color: var(--text-dim); font-size: 14px; }

/* china accent block */
.china-banner { border-left: 3px solid var(--china); background: color-mix(in srgb, var(--china) 7%, var(--panel)); }
.insight-card { border:1px solid var(--border); border-radius: 12px; padding: 16px; background: var(--panel); }
.insight-card h4 { margin: 0 0 7px; color: var(--text); font-size: 15.5px; }
.insight-card p { margin: 0; color: var(--text-dim); font-size: 14px; }
.insight-card .src { font-size: 11.5px; color: var(--text-faint); margin-top: 8px; display:block; }

.empty { text-align:center; color: var(--text-faint); padding: 50px 20px; border: 1px dashed var(--border); border-radius: var(--radius); }
.empty .big { font-size: 34px; margin-bottom: 10px; }
.loading { color: var(--text-faint); padding: 40px; text-align:center; }
.spinner { display:inline-block; width:18px; height:18px; border:2px solid var(--border); border-top-color: var(--accent); border-radius:50%; animation: spin .8s linear infinite; vertical-align:middle; margin-right:8px;}
@keyframes spin { to { transform: rotate(360deg); } }

.pill-row { display:flex; gap:8px; flex-wrap:wrap; margin: 6px 0 0; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0; width: 260px; height: 100vh; z-index: 90;
    transform: translateX(-100%); transition: transform .22s ease; background: var(--bg-2);
    padding-top: 64px;
  }
  body.nav-open .sidebar { transform: translateX(0); box-shadow: var(--shadow); }
  body.nav-open .scrim { display:block; position:fixed; inset:0; background:rgba(0,0,0,.5); z-index:80; }
  .nav-toggle { display:flex; }
  .layout-2col { grid-template-columns: 1fr; }
  .aside { position: static; }
  .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .topbar-search { order: 3; flex-basis: 100%; max-width: none; margin: 0; }
  .topbar { flex-wrap: wrap; }
}
@media (max-width: 560px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; }
  .news-when { order: 2; }
  .brand-text { display:none; }
}