:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1d2129;
  --border: #262a33;
  --text: #e6e8ee;
  --muted: #8a92a5;
  --accent: #ffd166;
  --accent-dim: #7d6835;
  --success: #4ade80;
  --danger: #ef476f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  padding: 24px 32px;
  border-bottom: 1px solid var(--border);
}

header h1 { margin: 0; font-size: 22px; letter-spacing: -0.01em; }
header .sub { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
header code { background: var(--panel); padding: 2px 6px; border-radius: 4px; }

main { padding: 24px 32px; max-width: 1400px; margin: 0 auto; }

/* ----- Mode tabs ----- */

.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.tab {
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.tab:hover:not(:disabled) { color: var(--text); background: transparent; }

.tab.is-active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* ----- Compose form ----- */

.compose form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  background: var(--panel);
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.compose label { display: flex; flex-direction: column; font-size: 12px; color: var(--muted); gap: 4px; }
.compose .prompt-field { font-size: 12px; }

textarea, select {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
}

textarea:focus, select:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.providers {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
  background: var(--bg);
}

.providers legend { font-size: 12px; color: var(--muted); padding: 0 4px; }

.provider-check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  flex-direction: row !important;
}

.provider-check input { accent-color: var(--accent); }

/* Multi-provider rows with paired model picker (Mode A, Mode C). */
.providers-with-models {
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}
.providers-with-models .provider-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.providers-with-models .provider-check { min-width: 80px; }
.model-picker { flex: 1; min-width: 0; }

/* Phase-2 slot-grid pickers (Mode A: 10 slots, Mode B: 4, C/D: 10). */
.slot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  background: var(--bg);
}
.slot-grid legend {
  font-size: 12px;
  color: var(--muted);
  padding: 0 4px;
}
.model-slot {
  width: 100%;
  font-size: 12px;
}

.compose-actions {
  display: flex;
  gap: 12px;
  align-items: end;
  flex-wrap: wrap;
}

.saved-prompts { flex-direction: column; }
.saved-prompts select { min-width: 200px; }

/* ----- Master picker (Mode C) ----- */

.master-picker { display: flex; flex-direction: column; gap: 8px; }
.master-save-toggle { font-size: 12px; color: var(--muted); }
.master-save-toggle summary { cursor: pointer; padding: 4px 0; }
.master-save-toggle summary:hover { color: var(--text); }
.master-save-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-top: 6px;
}
.master-preview {
  white-space: pre-wrap;
  max-height: 80px;
  overflow: auto;
  margin: 6px 0 0;
  font-size: 11px;
  color: var(--muted);
  font-family: inherit;
}

button {
  font: inherit;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
  transition: opacity 0.15s ease, background 0.15s ease;
}

button:hover:not(:disabled) { background: var(--border); }
button:disabled { opacity: 0.6; cursor: wait; }

.btn-primary {
  background: var(--accent);
  color: #111;
  border: 0;
  padding: 10px 18px;
  font-weight: 600;
  min-width: 180px;
}

.btn-primary:hover:not(:disabled) { background: var(--accent); opacity: 0.88; }

.btn-secondary {
  background: var(--panel-2);
}

.btn-primary .btn-busy { display: none; align-items: center; gap: 8px; justify-content: center; }
.btn-primary .btn-idle { display: inline; }
.btn-primary:disabled .btn-busy { display: inline-flex; }
.btn-primary:disabled .btn-idle { display: none; }

.spinner {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid rgba(0,0,0,0.25);
  border-top-color: #111;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

#elapsed { font-variant-numeric: tabular-nums; opacity: 0.75; }

.htmx-indicator { display: none; }

h2 { margin: 32px 0 12px; font-size: 14px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }

/* ----- Experiments ----- */

.experiments { display: flex; flex-direction: column; gap: 24px; }

.empty { color: var(--muted); font-size: 13px; }

.experiment-row {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.row-head { display: flex; flex-direction: column; gap: 8px; }
.row-prompt {
  margin: 0;
  font-size: 14px;
  color: var(--text);
  line-height: 1.4;
}
.row-summary {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--muted);
  flex-wrap: wrap;
}
.row-summary strong { color: var(--text); font-variant-numeric: tabular-nums; }

.row-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

/* ----- Card ----- */

.card {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease;
}

.card.is-winner { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }

.card img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; background: #000; display: block; }

.card-error-box {
  padding: 12px;
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  border-bottom: 1px solid var(--border);
}
.card-error-box pre {
  white-space: pre-wrap;
  margin: 6px 0 0;
  font-size: 11px;
  color: var(--muted);
  max-height: 120px;
  overflow: auto;
}

.card .meta { padding: 10px 12px; font-size: 12px; color: var(--muted); display: flex; flex-direction: column; gap: 8px; }
.card .meta-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.card .meta-top strong { color: var(--text); text-transform: capitalize; font-size: 13px; }
.card .meta-line { margin: 0; font-variant-numeric: tabular-nums; }

.badges { display: flex; gap: 4px; flex-wrap: wrap; }
.badge {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--panel);
  color: var(--muted);
  border: 1px solid var(--border);
}
.badge-winner { background: var(--accent); color: #111; border-color: var(--accent); }

.card-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 2px;
}

.thumb, .winner-btn {
  background: transparent;
  border: 1px solid var(--border);
  padding: 4px 8px;
  font-size: 12px;
  border-radius: 4px;
  color: var(--muted);
}
.thumb:hover, .winner-btn:hover { background: var(--panel); color: var(--text); }
.thumb.is-active { background: var(--panel); color: var(--text); border-color: var(--muted); }
.winner-btn.is-active { background: var(--accent); color: #111; border-color: var(--accent); }

.card.error { border-color: var(--danger); padding: 0; }
.card.error .meta-top strong { color: var(--danger); }

/* ----- Row & card ornaments (modes B/C/D) ----- */

.row-pill {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
  text-transform: lowercase;
  letter-spacing: 0.03em;
}

.ref-strip {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.ref-strip img {
  width: 56px;
  height: 56px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: #000;
}

.model-badge {
  font-size: 10px;
  color: var(--muted);
  font-family: ui-monospace, "Cascadia Code", Menlo, monospace;
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--bg);
  border: 1px solid var(--border);
  margin-left: 6px;
  letter-spacing: 0.01em;
}

.variant-label {
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 3px;
  background: var(--accent);
  color: #111;
  font-weight: 700;
  margin-left: 4px;
  letter-spacing: 0.04em;
}

.card-prompt {
  font-size: 11px;
  color: var(--muted);
  margin: 4px 0 0;
  line-height: 1.4;
  font-style: italic;
  display: flex;
  align-items: flex-start;
  gap: 4px;
}
.card-prompt-text { flex: 1; min-width: 0; }
.copy-prompt-btn {
  background: transparent;
  border: 0;
  color: var(--muted);
  cursor: pointer;
  padding: 0 4px;
  font-size: 14px;
  line-height: 1;
  font-style: normal;
}
.copy-prompt-btn:hover { color: var(--text); }