:root {
  --bg: #0b1020;
  --bg2: #131a30;
  --panel: #1a2240;
  --panel2: #232c4e;
  --ink: #e7ecf6;
  --ink-dim: #9aa3c0;
  --line: #2a3258;
  --accent: #7aa2ff;
  --accent2: #ff8fb1;
  --good: #6ee7b7;
  --warn: #fbbf24;
  --bad: #f87171;
  --grad: linear-gradient(135deg,#7aa2ff,#ff8fb1);
  --mono: ui-monospace, "JetBrains Mono", "SF Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif; line-height: 1.55; font-size: 15px; }
body { display: flex; min-height: 100vh; }
a { color: var(--accent); }

/* Sidebar */
#sidebar {
  position: sticky; top: 0; height: 100vh;
  width: 270px; flex: 0 0 270px;
  background: var(--bg2);
  border-right: 1px solid var(--line);
  padding: 22px 18px;
  overflow-y: auto;
}
.brand {
  font-weight: 700; font-size: 18px; letter-spacing: .3px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  margin-bottom: 18px;
}
.brand span { font-size: 11px; letter-spacing: 2px; color: var(--ink-dim); font-weight: 500; text-transform: uppercase; -webkit-text-fill-color: var(--ink-dim); }
#toc { display: flex; flex-direction: column; gap: 2px; }
#toc a {
  color: var(--ink-dim); text-decoration: none; padding: 6px 10px;
  border-radius: 6px; font-size: 13px; border-left: 2px solid transparent;
}
#toc a:hover { color: var(--ink); background: var(--panel); }
#toc a.active { color: var(--ink); background: var(--panel); border-left-color: var(--accent); }
.legend { margin-top: 24px; font-size: 11px; color: var(--ink-dim); padding-top: 16px; border-top: 1px solid var(--line); }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--good); margin-right: 4px; }

/* Main */
#content { flex: 1; max-width: 1100px; padding: 28px 42px 80px; }
.hero { margin-bottom: 48px; padding: 32px 0 20px; border-bottom: 1px solid var(--line); }
.hero h1 {
  font-size: 38px; margin: 0 0 12px; line-height: 1.15;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede { color: var(--ink-dim); font-size: 16px; margin: 0 0 22px; max-width: 700px; }
.hero-stats { display: flex; gap: 22px; font-size: 13px; color: var(--ink-dim); }
.hero-stats b { color: var(--ink); font-weight: 700; font-size: 22px; display: block; }

section { margin: 50px 0; padding-top: 12px; scroll-margin-top: 12px; }
section h2 { font-size: 24px; margin: 0 0 12px; }
section > p { color: var(--ink-dim); max-width: 760px; }

.demo {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
  margin: 20px 0;
}
.demo h3 { margin: 0 0 6px; font-size: 16px; }
.hint { color: var(--ink-dim); font-size: 13px; margin: 0 0 14px; }

.controls { display: flex; flex-wrap: wrap; gap: 18px 22px; align-items: center; margin: 6px 0 16px; font-size: 13px; }
.controls label { display: flex; align-items: center; gap: 8px; color: var(--ink-dim); }
.controls input[type=range] { width: 130px; accent-color: var(--accent); }
.controls input[type=range] + span { color: var(--ink); font-family: var(--mono); min-width: 32px; }
.controls input[type=checkbox] { accent-color: var(--accent); }
.controls select, .controls input[type=text] {
  background: var(--bg2); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; padding: 4px 8px;
}

button {
  background: var(--panel2); color: var(--ink); border: 1px solid var(--line);
  border-radius: 7px; padding: 6px 12px; cursor: pointer; font-size: 13px;
  transition: all .15s;
}
button:hover { background: var(--accent); border-color: var(--accent); color: #0b1020; }
button.primary { background: var(--accent); color: #0b1020; border-color: var(--accent); }

/* Cards / grid */
.card { background: var(--panel2); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; margin: 14px 0; }
.card h4 { margin: 0 0 10px; font-size: 14px; color: var(--accent); letter-spacing: .3px; text-transform: uppercase; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 14px 0; }
@media (max-width: 800px){ .grid2 { grid-template-columns: 1fr; } #sidebar{ display:none; } #content{ padding: 20px; } }

table { width: 100%; border-collapse: collapse; font-size: 13px; }
table th, table td { padding: 7px 10px; text-align: left; border-bottom: 1px solid var(--line); }
table th { color: var(--ink-dim); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .4px; }
table.mini th, table.mini td { padding: 5px 8px; font-size: 12px; }

/* Matrix display */
.matrix { display: grid; gap: 3px; margin: 8px 0; font-family: var(--mono); font-size: 12px; user-select: none; }
.cell {
  background: var(--panel2); border: 1px solid var(--line); border-radius: 5px;
  min-height: 32px; display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all .15s;
}
.cell:hover { border-color: var(--accent); transform: scale(1.05); }
.cell.head { background: transparent; border: none; color: var(--ink-dim); cursor: default; }
.cell.head:hover { transform: none; }
.cell.empty { background: transparent; border: none; }
.cell.best { box-shadow: 0 0 0 2px var(--good); }
.cell.highlight { background: rgba(122, 162, 255, .2); border-color: var(--accent); }
.cell.unrated { color: var(--ink-dim); opacity: .35; }

/* Tabs */
.tabs { display: flex; gap: 4px; margin: 10px 0 14px; border-bottom: 1px solid var(--line); }
.tabs button {
  background: transparent; border: none; border-bottom: 2px solid transparent;
  border-radius: 0; padding: 8px 14px; color: var(--ink-dim);
}
.tabs button:hover { color: var(--ink); background: transparent; }
.tabs button.active { color: var(--ink); border-bottom-color: var(--accent); }

.rec-body { min-height: 200px; padding: 8px 0; }

/* Metric cards */
.metric-cards { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 14px; }
.mc { background: var(--bg2); border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; min-width: 110px; }
.mc .lbl { font-size: 11px; color: var(--ink-dim); text-transform: uppercase; letter-spacing: .5px; }
.mc .val { font-size: 20px; font-weight: 700; font-family: var(--mono); }
.mc .val.good { color: var(--good); }
.mc .val.warn { color: var(--warn); }
.mc .val.bad { color: var(--bad); }

/* Implicit map */
.imap-row { display: grid; grid-template-columns: 130px 1fr 60px; align-items: center; gap: 12px; margin: 6px 0; }
.imap-row .label { font-size: 13px; color: var(--ink-dim); }
.imap-row .bar { height: 18px; background: var(--bg2); border-radius: 4px; position: relative; overflow: hidden; }
.imap-row .bar-fill { position: absolute; left: 0; top: 0; bottom: 0; background: var(--grad); }
.imap-row .stars { font-family: var(--mono); color: var(--warn); font-size: 14px; text-align: right; }

/* Drag list */
.rank-list { display: flex; flex-direction: column; gap: 6px; max-width: 540px; }
.rank-item {
  display: grid; grid-template-columns: 28px 1fr 70px; gap: 12px; align-items: center;
  background: var(--bg2); border: 1px solid var(--line); border-radius: 7px; padding: 8px 12px;
  cursor: grab; transition: all .15s;
}
.rank-item.dragging { opacity: .4; }
.rank-item .pos { font-family: var(--mono); color: var(--ink-dim); font-size: 13px; }
.rank-item .rel {
  font-family: var(--mono); font-size: 12px; text-align: center; padding: 2px 8px;
  border-radius: 999px; background: rgba(110, 231, 183, .15); color: var(--good);
}
.rank-item .rel[data-r="0"] { background: rgba(248, 113, 113, .15); color: var(--bad); }

/* Confusion matrix */
.cm { display: grid; grid-template-columns: 80px 1fr 1fr; gap: 6px; max-width: 480px; }
.cm .cm-head { color: var(--ink-dim); font-size: 12px; text-align: center; padding: 8px; }
.cm .cm-cell {
  border-radius: 8px; padding: 18px; text-align: center; cursor: pointer;
  font-family: var(--mono); transition: all .15s;
}
.cm .cm-cell .v { font-size: 26px; font-weight: 700; }
.cm .cm-cell .l { font-size: 11px; color: var(--ink-dim); margin-top: 4px; }
.cm .tp { background: rgba(110, 231, 183, .12); border: 1px solid var(--good); }
.cm .tn { background: rgba(110, 231, 183, .12); border: 1px solid var(--good); }
.cm .fp { background: rgba(251, 191, 36, .12); border: 1px solid var(--warn); }
.cm .fn { background: rgba(248, 113, 113, .12); border: 1px solid var(--bad); }
.cm .cm-cell:hover { transform: scale(1.03); }

/* Cosine demo canvas */
.canvas-wrap { display: block; background: var(--bg2); border-radius: 10px; padding: 8px; border: 1px solid var(--line); }
canvas { display: block; max-width: 100%; }

/* Funnel */
.funnel-stage {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px; margin: 6px auto; border-radius: 10px;
  background: var(--panel2); border: 1px solid var(--line);
  transition: all .25s; cursor: pointer;
}
.funnel-stage:hover { border-color: var(--accent); }
.funnel-stage.active { background: rgba(122,162,255,.15); border-color: var(--accent); }
.funnel-stage .name { font-weight: 600; }
.funnel-stage .count { font-family: var(--mono); color: var(--ink-dim); font-size: 13px; }

/* Loop diagram */
.loop {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px; max-width: 560px; margin: 14px 0;
}
.loop .node {
  background: var(--bg2); border: 1px solid var(--line); border-radius: 10px;
  padding: 14px; text-align: center; position: relative;
}
.loop .node .icon { font-size: 24px; }
.loop .node .name { font-weight: 600; margin-top: 4px; }
.loop .node .bias { font-size: 11px; color: var(--warn); margin-top: 4px; }

/* HPO panel */
.hpo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.hpo-grid h5 { margin: 0 0 6px; font-size: 13px; color: var(--ink-dim); }
.hpo-grid .stats { font-size: 12px; font-family: var(--mono); color: var(--ink-dim); padding: 6px 0; }

/* TF-IDF panel */
.doc-input { width: 100%; background: var(--bg2); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; padding: 8px 12px; margin: 4px 0; font-family: inherit; font-size: 13px; }
.tfidf-table { font-family: var(--mono); font-size: 11px; overflow-x: auto; }
.tfidf-table table { min-width: 100%; }
.tfidf-table .v0 { color: var(--ink-dim); opacity: .35; }
.tfidf-table .vlow { color: var(--accent); }
.tfidf-table .vhigh { color: var(--accent2); font-weight: 700; }

/* Beta dist canvas */
.arm-card { background: var(--bg2); border: 1px solid var(--line); border-radius: 8px; padding: 10px; }
.arm-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 10px; margin: 12px 0; }
.arm-card h5 { margin: 0 0 6px; font-size: 13px; }
.arm-card .ab { font-family: var(--mono); font-size: 11px; color: var(--ink-dim); }
.arm-card .ctr { font-family: var(--mono); font-size: 12px; }
.arm-card.best { border-color: var(--good); }

footer { margin-top: 80px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 12px; color: var(--ink-dim); }
.mt { margin-top: 14px; }

/* helper classes */
.pill { display: inline-block; padding: 1px 7px; border-radius: 999px; font-size: 11px; font-family: var(--mono); }
.pill.cf { background: rgba(122,162,255,.18); color: var(--accent); }
.pill.cb { background: rgba(255, 143, 177, .18); color: var(--accent2); }
.pill.ok { background: rgba(110,231,183,.18); color: var(--good); }
.pill.warn { background: rgba(251,191,36,.18); color: var(--warn); }