/* ================================================================
   URBAN·AI — visual system
   dark ink / ivory type / teal signal / amber counterpoint
   ================================================================ */

:root {
  --bg: #0a0c10;
  --bg-2: #0e1117;
  --panel: #11151d;
  --panel-2: #141926;
  --line: rgba(236, 234, 228, 0.09);
  --line-strong: rgba(236, 234, 228, 0.18);
  --ink: #eceae4;
  --ink-dim: #9a998f;
  --ink-faint: #62655e;
  --teal: #45d6b8;
  --teal-dim: rgba(69, 214, 184, 0.14);
  --amber: #e0a458;
  --amber-dim: rgba(224, 164, 88, 0.14);
  --violet: #9d8cff;
  --violet-dim: rgba(157, 140, 255, 0.14);
  --serif: "Newsreader", Georgia, serif;
  --sans: "Inter", -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 300;
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: var(--mono); font-size: 0.82em; letter-spacing: 0.02em; }
.dim { color: var(--ink-dim); }

::selection { background: var(--teal); color: var(--bg); }

/* ---------------- nav ---------------- */

#topnav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10, 12, 16, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 32px;
  height: 56px; display: flex; align-items: center; justify-content: space-between;
}
.brand {
  font-family: var(--mono); font-size: 14px; font-weight: 500;
  letter-spacing: 0.22em; color: var(--ink); text-decoration: none;
}
.brand span { color: var(--teal); }
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  color: var(--ink-dim); text-decoration: none; font-size: 12.5px;
  letter-spacing: 0.08em; text-transform: uppercase; transition: color 0.2s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links .nav-gh { color: var(--teal); }

/* ---------------- hero ---------------- */

.hero {
  position: relative; min-height: 92vh;
  display: flex; align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(ellipse 60% 45% at 72% 20%, rgba(69, 214, 184, 0.055), transparent),
    radial-gradient(ellipse 50% 40% at 15% 85%, rgba(157, 140, 255, 0.05), transparent),
    var(--bg);
}
#heroCanvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-inner {
  position: relative; max-width: 1180px; margin: 0 auto;
  padding: 140px 32px 90px;
}
.kicker {
  font-family: var(--mono); font-size: 11.5px; font-weight: 400;
  letter-spacing: 0.28em; text-transform: uppercase; color: var(--teal);
  margin-bottom: 22px;
}
.hero h1 {
  font-family: var(--serif); font-weight: 300; font-size: clamp(40px, 5.4vw, 66px);
  line-height: 1.12; letter-spacing: -0.01em; max-width: 850px;
}
.hero h1 em { font-style: italic; color: var(--ink); }
.lede {
  max-width: 640px; margin-top: 28px;
  color: var(--ink-dim); font-size: 16px; line-height: 1.75;
}
.hero-stats {
  display: flex; gap: 56px; margin-top: 54px; flex-wrap: wrap;
}
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong {
  font-family: var(--serif); font-weight: 300; font-size: 40px; line-height: 1;
  color: var(--ink);
}
.hero-stats span {
  margin-top: 8px; font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint);
  line-height: 1.6;
}
.hero-cta {
  display: inline-block; margin-top: 56px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--ink); text-decoration: none;
  border: 1px solid var(--line-strong); padding: 13px 26px;
  transition: all 0.25s;
}
.hero-cta:hover { border-color: var(--teal); color: var(--teal); background: var(--teal-dim); }

/* ---------------- sections ---------------- */

.section {
  max-width: 1180px; margin: 0 auto; padding: 110px 32px 40px;
}
.section-head h2 {
  font-family: var(--serif); font-weight: 300; font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.2; margin-top: 6px; max-width: 760px;
}
.section-lede { max-width: 640px; margin-top: 18px; color: var(--ink-dim); }

/* ---------------- console ---------------- */

.console {
  margin-top: 44px; border: 1px solid var(--line); background: var(--panel);
}
.preset-row {
  display: flex; flex-wrap: wrap; gap: 8px; padding: 16px 18px 0;
}
.preset-chip {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em;
  color: var(--ink-dim); background: transparent;
  border: 1px solid var(--line); padding: 6px 13px; cursor: pointer;
  transition: all 0.2s;
}
.preset-chip:hover { color: var(--teal); border-color: var(--teal); }
#challengeInput {
  width: 100%; background: transparent; border: none; outline: none;
  color: var(--ink); font-family: var(--serif); font-size: 19px; font-weight: 300;
  line-height: 1.6; padding: 20px 20px 8px; resize: vertical; min-height: 96px;
}
#challengeInput::placeholder { color: var(--ink-faint); font-style: italic; }
.console-foot {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 18px 16px;
}
.hint { color: var(--ink-faint); font-size: 11px; }
#runBtn {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--bg); background: var(--teal);
  border: none; padding: 12px 30px; cursor: pointer; transition: all 0.2s;
}
#runBtn:hover:not(:disabled) { background: #63e6cb; }
#runBtn:disabled { background: var(--panel-2); color: var(--ink-faint); cursor: not-allowed; }

/* ---------------- agent rail ---------------- */

.agent-rail {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-top: none;
  margin-bottom: 44px;
}
.agent-cell {
  background: var(--bg-2); padding: 15px 16px 13px; position: relative;
  transition: background 0.35s;
}
.agent-cell .a-idx {
  font-family: var(--mono); font-size: 10px; color: var(--ink-faint);
  letter-spacing: 0.14em;
}
.agent-cell .a-name {
  display: block; font-size: 12.5px; font-weight: 500; letter-spacing: 0.03em;
  margin-top: 3px; color: var(--ink-dim); transition: color 0.3s;
}
.agent-cell .a-status {
  display: block; font-family: var(--mono); font-size: 10px; margin-top: 7px;
  color: var(--ink-faint); min-height: 14px;
}
.agent-cell::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0%;
  background: var(--teal); transition: width 0.5s ease;
}
.agent-cell.running { background: var(--panel-2); }
.agent-cell.running .a-name { color: var(--ink); }
.agent-cell.running .a-status { color: var(--amber); }
.agent-cell.running::after { width: 55%; background: var(--amber); }
.agent-cell.done .a-name { color: var(--ink); }
.agent-cell.done .a-status { color: var(--teal); }
.agent-cell.done::after { width: 100%; }

/* ---------------- results panels ---------------- */

.results {
  display: grid; grid-template-columns: 1fr 1fr; gap: 22px;
}
.panel {
  border: 1px solid var(--line); background: var(--panel); padding: 26px 28px;
  opacity: 0; transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.panel.visible { opacity: 1; transform: none; }
.panel-wide { grid-column: 1 / -1; }
.panel h3 {
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.22em; text-transform: uppercase; color: var(--ink-dim);
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 20px;
}
.panel h3 .ms { color: var(--ink-faint); letter-spacing: 0.05em; }

/* scenario panel */
.scen-top { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 18px; }
.badge {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 5px 12px;
  background: var(--teal-dim); color: var(--teal); border: 1px solid rgba(69,214,184,0.3);
}
.badge.amber { background: var(--amber-dim); color: var(--amber); border-color: rgba(224,164,88,0.3); }
.scen-grid { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; font-size: 13.5px; }
.scen-grid dt { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-faint); padding-top: 3px; }
.scen-grid dd { color: var(--ink-dim); }
.chip-set { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-size: 12px; padding: 3px 10px; border: 1px solid var(--line);
  color: var(--ink-dim); background: var(--bg-2);
}
.dial-row { display: flex; align-items: center; gap: 20px; margin-top: 20px; }
.dial-row svg { flex-shrink: 0; }
.dial-cap { font-size: 12.5px; color: var(--ink-dim); line-height: 1.6; }

/* entity cards */
.card-list { display: flex; flex-direction: column; gap: 12px; }
.ecard {
  border: 1px solid var(--line); background: var(--bg-2); padding: 14px 16px;
  position: relative;
}
.ecard-top { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.ecard-name { font-family: var(--serif); font-size: 16.5px; font-weight: 400; line-height: 1.35; }
.ecard-score { font-family: var(--mono); font-size: 13px; color: var(--teal); white-space: nowrap; }
.ecard-meta {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-faint); margin-top: 5px;
}
.ecard-body { font-size: 12.5px; color: var(--ink-dim); margin-top: 8px; line-height: 1.6; }
.scorebar { height: 2px; background: var(--line); margin-top: 12px; position: relative; overflow: hidden; }
.scorebar i {
  position: absolute; left: 0; top: 0; bottom: 0; background: var(--teal);
  width: 0; transition: width 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}
.ecard .tag {
  display: inline-block; font-family: var(--mono); font-size: 9.5px;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--amber);
  border: 1px solid rgba(224,164,88,0.3); padding: 1px 7px; margin: 6px 6px 0 0;
}
.capbars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px 14px; margin-top: 10px; }
.capbar { font-family: var(--mono); font-size: 9.5px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.05em; }
.capbar .cb-track { height: 2px; background: var(--line); margin-top: 4px; }
.capbar .cb-fill { height: 100%; background: var(--violet); }

/* validation panel */
.val-grid { display: grid; grid-template-columns: 220px 1fr 240px; gap: 36px; align-items: start; }
.val-block h4 {
  font-family: var(--mono); font-size: 10px; font-weight: 400; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--ink-faint); margin-bottom: 14px;
}
.conf-num {
  font-family: var(--serif); font-weight: 300; font-size: 56px; line-height: 1;
}
.conf-sub { font-family: var(--mono); font-size: 10.5px; color: var(--ink-faint); margin-top: 8px; letter-spacing: 0.08em; }
.issues { margin-top: 18px; }
.issues li {
  list-style: none; font-size: 12.5px; color: var(--ink-dim);
  padding: 7px 0 7px 18px; position: relative; border-top: 1px solid var(--line);
}
.issues li::before { content: "▲"; position: absolute; left: 0; font-size: 8px; color: var(--amber); top: 11px; }
.issues li.ok::before { content: "●"; color: var(--teal); }

/* ---------------- graph ---------------- */

.graph-wrap {
  margin-top: 44px; border: 1px solid var(--line); background: var(--panel);
  position: relative;
}
#graphViz { width: 100%; height: 620px; }
#graphViz svg { display: block; }
.graph-legend {
  position: absolute; top: 14px; left: 16px; display: flex; gap: 18px;
  font-size: 10px; color: var(--ink-dim); letter-spacing: 0.08em;
  text-transform: uppercase; pointer-events: none; flex-wrap: wrap;
}
.graph-legend .dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 6px; vertical-align: -1px; }
.dot-theory { background: var(--amber); }
.dot-algo { background: var(--teal); }
.dot-data { background: var(--violet); }
.graph-legend .edge { display: inline-block; width: 18px; height: 0; border-top: 1px solid var(--ink-dim); margin-right: 6px; vertical-align: 3px; }
.edge-cooc { border-top-style: dashed !important; }
.graph-empty {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  color: var(--ink-faint); font-size: 12px; letter-spacing: 0.15em; pointer-events: none;
}
.graph-tip {
  position: absolute; pointer-events: none; z-index: 10;
  background: var(--bg); border: 1px solid var(--line-strong);
  padding: 10px 14px; font-size: 12px; max-width: 280px; line-height: 1.5;
  color: var(--ink-dim); display: none;
}
.graph-tip strong { display: block; color: var(--ink); font-weight: 500; margin-bottom: 3px; }

/* ---------------- explorer ---------------- */

.explorer { margin-top: 44px; border: 1px solid var(--line); background: var(--panel); }
.explorer-controls {
  display: flex; justify-content: space-between; align-items: center;
  border-bottom: 1px solid var(--line); padding: 0 18px; flex-wrap: wrap; gap: 10px;
}
.tab-row { display: flex; }
.tab {
  background: none; border: none; color: var(--ink-faint); cursor: pointer;
  font-family: var(--sans); font-size: 13px; font-weight: 400;
  padding: 16px 18px; border-bottom: 2px solid transparent; transition: all 0.2s;
}
.tab .mono { color: var(--ink-faint); margin-left: 6px; font-size: 10.5px; }
.tab:hover { color: var(--ink-dim); }
.tab.active { color: var(--ink); border-bottom-color: var(--teal); }
#explorerSearch {
  background: var(--bg-2); border: 1px solid var(--line); color: var(--ink);
  font-family: var(--mono); font-size: 12.5px; padding: 8px 14px; width: 240px;
  outline: none;
}
#explorerSearch:focus { border-color: var(--line-strong); }
.explorer-body { display: grid; grid-template-columns: 1fr 1.1fr; min-height: 460px; }
.explorer-list {
  list-style: none; max-height: 520px; overflow-y: auto;
  border-right: 1px solid var(--line);
}
.explorer-list li {
  padding: 12px 20px; cursor: pointer; border-bottom: 1px solid var(--line);
  transition: background 0.15s;
}
.explorer-list li:hover { background: var(--panel-2); }
.explorer-list li.active { background: var(--panel-2); box-shadow: inset 2px 0 0 var(--teal); }
.explorer-list .el-name { font-size: 13.5px; font-weight: 400; }
.explorer-list .el-meta { font-family: var(--mono); font-size: 10px; color: var(--ink-faint); margin-top: 2px; letter-spacing: 0.06em; text-transform: uppercase; }
.explorer-detail { padding: 26px 30px; max-height: 520px; overflow-y: auto; }
.explorer-detail h4 { font-family: var(--serif); font-weight: 400; font-size: 21px; line-height: 1.3; margin-bottom: 6px; }
.explorer-detail .ed-meta { font-family: var(--mono); font-size: 10.5px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 18px; }
.explorer-detail dl { display: grid; grid-template-columns: auto 1fr; gap: 7px 16px; font-size: 13px; }
.explorer-detail dt { font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); padding-top: 3px; }
.explorer-detail dd { color: var(--ink-dim); }
.explorer-detail ul { margin: 4px 0 0 16px; color: var(--ink-dim); font-size: 12.5px; }

/* ---------------- method ---------------- */

.method-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 44px;
}
.method-card { border: 1px solid var(--line); background: var(--panel); padding: 26px 26px 28px; }
.method-card h3 {
  font-size: 14.5px; font-weight: 500; margin-bottom: 12px; letter-spacing: 0.02em;
}
.method-card h3 .mono { color: var(--teal); margin-right: 10px; font-size: 11px; }
.method-card p { font-size: 13px; color: var(--ink-dim); line-height: 1.7; }

/* ---------------- footer ---------------- */

footer { border-top: 1px solid var(--line); margin-top: 110px; }
.foot-inner { max-width: 1180px; margin: 0 auto; padding: 44px 32px 60px; }
.foot-inner .mono { font-size: 11px; letter-spacing: 0.16em; color: var(--ink-dim); }
.foot-inner .dim { font-size: 12.5px; margin-top: 10px; color: var(--ink-faint); max-width: 560px; }

/* ---------------- responsive ---------------- */

@media (max-width: 900px) {
  .results { grid-template-columns: 1fr; }
  .val-grid { grid-template-columns: 1fr; gap: 28px; }
  .method-grid { grid-template-columns: 1fr; }
  .agent-rail { grid-template-columns: 1fr; }
  .explorer-body { grid-template-columns: 1fr; }
  .explorer-list { border-right: none; max-height: 300px; }
  .nav-links a:not(.nav-gh) { display: none; }
  .hero-stats { gap: 32px; }
}