/* ============================================================
   Fork Dynamics Explorer — stylesheet
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #0d1117;
  --panel:      #161b22;
  --panel2:     #1c2128;
  --border:     #30363d;
  --text:       #e6edf3;
  --muted:      #8b949e;
  --accent:     #58a6ff;

  --v27:        #3fb950;
  --v27-dim:    rgba(63,185,80,.18);
  --v26:        #f85149;
  --v26-dim:    rgba(248,81,73,.18);
  --con:        #d29922;
  --con-dim:    rgba(210,153,34,.18);

  --radius:     8px;
  --gap:        16px;
}

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
}

/* ── Layout ─────────────────────────────────────────────── */

header {
  border-bottom: 1px solid var(--border);
  padding: 18px 24px 14px;
}

header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -.3px;
}

header p {
  color: var(--muted);
  font-size: .85rem;
  margin-top: 3px;
}

header .header-meta {
  display: flex;
  gap: 20px;
  margin-top: 8px;
  font-size: .78rem;
  color: var(--muted);
}

header .header-meta span strong {
  color: var(--text);
}

main {
  display: grid;
  grid-template-columns: 300px 1fr 280px;
  grid-template-rows: auto auto;
  gap: var(--gap);
  padding: var(--gap);
  max-width: 1400px;
  margin: 0 auto;
}

/* ── Panels ─────────────────────────────────────────────── */

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.panel-title {
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  margin-bottom: 14px;
}

/* ── Parameters ─────────────────────────────────────────── */

#params-panel {
  grid-column: 1;
  grid-row: 1 / 3;
}

.param-row {
  margin-bottom: 18px;
}

.param-row:last-child { margin-bottom: 0; }

.param-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 4px;
}

.param-label {
  font-size: .82rem;
  font-weight: 500;
}

.param-value {
  font-size: .82rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  min-width: 44px;
  text-align: right;
}

.param-desc {
  font-size: .73rem;
  color: var(--muted);
  margin-bottom: 6px;
  line-height: 1.35;
}

input[type=range] {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  outline: none;
  cursor: pointer;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  transition: transform .1s;
}

input[type=range]::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

input[type=range]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  cursor: pointer;
}

/* ── Prediction ─────────────────────────────────────────── */

#prediction-panel {
  grid-column: 2;
  grid-row: 1;
}

.pred-top {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 20px;
}

.pred-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 140px;
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  transition: border-color .2s, background .2s;
}

.pred-badge.v27_dominant  { border-color: var(--v27); background: var(--v27-dim); }
.pred-badge.v26_dominant  { border-color: var(--v26); background: var(--v26-dim); }
.pred-badge.contested     { border-color: var(--con); background: var(--con-dim); }

.pred-outcome {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -.2px;
}
.pred-badge.v27_dominant .pred-outcome { color: var(--v27); }
.pred-badge.v26_dominant .pred-outcome { color: var(--v26); }
.pred-badge.contested    .pred-outcome { color: var(--con); }

.pred-conf {
  font-size: .75rem;
  color: var(--muted);
  margin-top: 3px;
}

/* Probability bars */
.prob-bars {
  flex: 1;
}

.prob-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.prob-row:last-child { margin-bottom: 0; }

.prob-label {
  font-size: .78rem;
  width: 88px;
  flex-shrink: 0;
}

.prob-track {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.prob-fill {
  height: 100%;
  border-radius: 4px;
  transition: width .25s ease;
}

.prob-fill.v27_dominant { background: var(--v27); }
.prob-fill.v26_dominant { background: var(--v26); }
.prob-fill.contested    { background: var(--con); }

.prob-pct {
  font-size: .75rem;
  font-variant-numeric: tabular-nums;
  width: 36px;
  text-align: right;
  color: var(--muted);
}

/* Metrics grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.metric-card {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
}

.metric-label {
  font-size: .7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 4px;
}

.metric-value {
  font-size: 1rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.metric-value.v27 { color: var(--v27); }
.metric-value.v26 { color: var(--v26); }
.metric-value.neutral { color: var(--text); }

/* ── Heatmap ─────────────────────────────────────────────── */

#heatmap-panel {
  grid-column: 2;
  grid-row: 2;
}

.heatmap-wrap {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

#heatmap-canvas {
  display: block;
  border-radius: 4px;
  cursor: crosshair;
}

.heatmap-legend {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 4px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .78rem;
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.axis-selectors {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.axis-label {
  font-size: .7rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.axis-sep {
  font-size: .78rem;
  color: var(--muted);
}

.axis-select {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-size: .75rem;
  padding: 3px 6px;
  cursor: pointer;
  outline: none;
}

.axis-select:hover  { border-color: var(--accent); }
.axis-select:focus  { border-color: var(--accent); }

.model-toggle {
  display: flex;
  gap: 2px;
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 2px;
  margin-left: 4px;
}

.model-btn {
  background: transparent;
  border: none;
  border-radius: 4px;
  color: var(--muted);
  cursor: pointer;
  font-size: .72rem;
  font-weight: 500;
  padding: 3px 10px;
  transition: background .15s, color .15s;
}

.model-btn:hover  { background: var(--border); color: var(--text); }
.model-btn.active { background: var(--accent); color: #0d1117; font-weight: 600; }

.heatmap-note {
  font-size: .72rem;
  color: var(--muted);
  margin-top: 12px;
  line-height: 1.4;
}

/* ── Nearest Scenarios ──────────────────────────────────── */

#nearest-panel {
  grid-column: 3;
  grid-row: 1 / 3;
}

.nn-item {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .15s, border-color .15s;
  margin-bottom: 8px;
}

.nn-item:last-child { margin-bottom: 0; }

.nn-item:hover {
  background: var(--panel2);
  border-color: var(--border);
}

.nn-item.selected {
  background: var(--panel2);
  border-color: var(--accent);
}

.nn-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nn-id {
  font-size: .75rem;
  font-family: monospace;
  color: var(--muted);
}

.nn-badge {
  font-size: .68rem;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 10px;
}

.nn-badge.v27_dominant { background: var(--v27-dim); color: var(--v27); }
.nn-badge.v26_dominant { background: var(--v26-dim); color: var(--v26); }
.nn-badge.contested    { background: var(--con-dim); color: var(--con); }

.nn-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.nn-chip {
  font-size: .7rem;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
}

.nn-dist {
  font-size: .68rem;
  color: var(--muted);
}

/* ── Time Series ─────────────────────────────────────────── */

#timeseries-section {
  border-top: 1px solid var(--border);
  padding: var(--gap);
  max-width: 1400px;
  margin: 0 auto;
}

.ts-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}

.ts-title {
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}

.ts-scenario-id {
  font-family: monospace;
  font-size: .82rem;
  color: var(--accent);
}

.ts-tabs {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.ts-tab {
  font-size: .78rem;
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}

.ts-tab:hover { background: var(--panel2); color: var(--text); }

.ts-tab.active {
  background: var(--panel2);
  border-color: var(--accent);
  color: var(--text);
}

.ts-chart-wrap {
  position: relative;
  height: 220px;
}

#ts-canvas { display: block; width: 100%; height: 100%; }

.ts-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 220px;
  color: var(--muted);
  font-size: .85rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

/* ── Footer ─────────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--border);
  padding: 16px 24px;
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  gap: 24px;
  font-size: .75rem;
  color: var(--muted);
}

footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* ── Loading overlay ─────────────────────────────────────── */

#loading {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  z-index: 100;
}

#loading h2 { font-size: 1rem; color: var(--text); }
#loading p  { font-size: .82rem; color: var(--muted); }

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Responsive ─────────────────────────────────────────── */

@media (max-width: 1100px) {
  main {
    grid-template-columns: 260px 1fr;
    grid-template-rows: auto auto auto;
  }
  #params-panel  { grid-column: 1; grid-row: 1 / 4; }
  #prediction-panel { grid-column: 2; grid-row: 1; }
  #heatmap-panel    { grid-column: 2; grid-row: 2; }
  #nearest-panel    { grid-column: 1 / 3; grid-row: 4; }
  .metrics-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 700px) {
  main { grid-template-columns: 1fr; }
  #params-panel     { grid-column: 1; grid-row: 1; }
  #prediction-panel { grid-column: 1; grid-row: 2; }
  #heatmap-panel    { grid-column: 1; grid-row: 3; }
  #nearest-panel    { grid-column: 1; grid-row: 4; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .heatmap-wrap { flex-direction: column; }
}