/* ============================================================
   Pathfinding Analyzer — style.css
   Pastel Green · Brown · Blue  |  DM Mono + Fraunces
   ============================================================ */

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

:root {
  /* ── Greens ── */
  --g50:  #edf5de; --g100: #c6de9a; --g200: #97c459;
  --g400: #5f9a1f; --g600: #3b6d11; --g800: #234208;

  /* ── Browns / Ambers ── */
  --b50:  #faeeda; --b100: #f8d49a; --b200: #efac42;
  --b400: #c07818; --b600: #854f0b; --b800: #5a3206;

  /* ── Blues ── */
  --bl50:  #e5f0fb; --bl100: #afd0f4; --bl200: #78b0ec;
  --bl400: #3480d4; --bl600: #175da6; --bl800: #0c3e76;

  /* ── Neutrals ── */
  --cream: #fdfaf4; --sand: #f4f0e6; --stone: #e8e2d4;
  --ink:   #252018; --ink2: #4a4435; --muted: #8a8270;

  /* ── Canvas colours (used by JS too) ── */
  --start:     #3b6d11;
  --end:       #854f0b;
  --wall:      #252018;
  --w5:        #b8d97a;
  --w10:       #f5c86a;
  --visited:   #afd0f4;
  --visited-b: #f8d49a;
  --path:      #efac42;
  --empty:     #fdfaf4;
  --grid-line: #e2ddd1;
}

/* ── Base ─────────────────────────────────────────────────── */
html, body { height: 100%; }
body {
  font-family: 'DM Mono', monospace;
  background: var(--cream);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.5;
}

/* ── App shell ───────────────────────────────────────────── */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ── Top bar ─────────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 52px;
  background: var(--sand);
  border-bottom: 1px solid var(--stone);
  flex-shrink: 0;
}
.topbar-left { display: flex; align-items: center; gap: 10px; }
.logo { font-size: 20px; color: var(--g600); line-height: 1; }
h1 {
  font-family: 'Fraunces', serif;
  font-size: 17px;
  font-weight: 600;
  color: var(--g800);
  letter-spacing: -0.3px;
}
.tagline {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.5px;
  padding: 2px 8px;
  background: var(--g50);
  border-radius: 20px;
  border: 1px solid var(--g100);
}
.mode-pills { display: flex; gap: 4px; }
.mode-pill {
  padding: 5px 14px;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  border: 1px solid var(--g200);
  background: white;
  color: var(--g600);
  border-radius: 20px;
  cursor: pointer;
  transition: all .15s;
}
.mode-pill.active { background: var(--g600); color: white; border-color: var(--g600); }
.mode-pill:hover:not(.active) { background: var(--g50); }

/* ── Main layout ─────────────────────────────────────────── */
.layout {
  display: grid;
  grid-template-columns: 210px 1fr 200px;
  flex: 1;
  overflow: hidden;
}

/* ── Panels ──────────────────────────────────────────────── */
.panel {
  background: var(--sand);
  overflow-y: auto;
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.panel-left  { border-right: 1px solid var(--stone); }
.panel-right { border-left:  1px solid var(--stone); }

.panel-section { display: flex; flex-direction: column; gap: 6px; }

.panel-label {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 1.8px;
  color: var(--muted);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--stone);
  margin-bottom: 2px;
}
.label-note { text-transform: none; letter-spacing: 0; font-size: 9px; }

/* Algorithm grid */
.algo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
}
.algo-btn {
  padding: 5px 2px;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  border: 1px solid var(--g100);
  background: white;
  color: var(--g600);
  border-radius: 5px;
  cursor: pointer;
  transition: all .12s;
  text-align: center;
}
.algo-btn.active { background: var(--g600); color: white; border-color: var(--g600); }
.algo-btn:hover:not(.active) { background: var(--g50); }

/* Heuristic radios */
.radio-group { display: flex; flex-direction: column; gap: 4px; }
.radio-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--ink2);
  cursor: pointer;
}
.radio-row input { accent-color: var(--g600); cursor: pointer; }

/* Compare select */
.select-field {
  width: 100%;
  padding: 5px 8px;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  border: 1px solid var(--g100);
  background: white;
  color: var(--ink);
  border-radius: 5px;
  cursor: pointer;
  outline: none;
}
.select-field:focus { border-color: var(--g400); }

/* Draw pills */
.draw-pills { display: flex; gap: 4px; }
.draw-pill {
  flex: 1;
  padding: 5px 2px;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  border: 1px solid var(--b200);
  background: white;
  color: var(--b600);
  border-radius: 5px;
  cursor: pointer;
  transition: all .12s;
  text-align: center;
}
.draw-pill.active { background: var(--b600); color: white; border-color: var(--b600); }
.draw-pill:hover:not(.active) { background: var(--b50); }

/* Toggle */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.toggle-label { font-size: 10px; color: var(--muted); }
.toggle-row input { accent-color: var(--g600); cursor: pointer; }

/* Maze buttons */
.maze-btn {
  width: 100%;
  padding: 5px 8px;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  border: 1px solid var(--bl200);
  background: white;
  color: var(--bl600);
  border-radius: 5px;
  cursor: pointer;
  transition: all .12s;
  text-align: left;
}
.maze-btn:hover { background: var(--bl50); }
.maze-btn:disabled { opacity: .4; cursor: not-allowed; }

/* Speed */
.speed-row { display: flex; align-items: center; gap: 6px; }
.speed-label { font-size: 9px; color: var(--muted); white-space: nowrap; }
input[type="range"] {
  -webkit-appearance: none;
  flex: 1;
  height: 3px;
  border-radius: 2px;
  background: var(--g200);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--g600);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--g600);
  cursor: pointer;
  border: none;
}

/* Action buttons */
.actions-section { gap: 5px !important; }
.btn-primary {
  width: 100%;
  padding: 8px;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  font-weight: 500;
  border: none;
  background: var(--g600);
  color: white;
  border-radius: 6px;
  cursor: pointer;
  transition: all .15s;
}
.btn-primary:hover   { background: var(--g800); }
.btn-primary:disabled { background: var(--g100); color: var(--g400); cursor: not-allowed; }
.btn-secondary {
  width: 100%;
  padding: 7px;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  border: 1px solid var(--stone);
  background: white;
  color: var(--ink2);
  border-radius: 6px;
  cursor: pointer;
  transition: all .15s;
}
.btn-secondary:hover { background: var(--g50); }

/* ── Canvas area ─────────────────────────────────────────── */
.canvas-area {
  overflow: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  background: var(--cream);
}

.canvas-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.algo-label {
  font-family: 'Fraunces', serif;
  font-size: 14px;
  color: var(--g800);
}
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  transition: background .3s;
}
.status-dot.idle    { background: var(--stone); }
.status-dot.running { background: var(--g400); animation: pulse 1s infinite; }
.status-dot.done    { background: var(--b400); }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.3} }

canvas {
  border: 1px solid var(--stone);
  border-radius: 6px;
  cursor: crosshair;
  display: block;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}

.status-bar {
  font-size: 10px;
  color: var(--muted);
  margin-top: 4px;
}

/* Compare layout */
.compare-row { display: flex; gap: 12px; align-items: flex-start; flex-wrap: wrap; }
.compare-col { display: flex; flex-direction: column; }

/* Compare metric cards */
.cmp-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.cmp-card {
  background: white;
  border: 1px solid var(--stone);
  border-radius: 8px;
  padding: 10px 12px;
}
.cmp-card-title {
  font-size: 11px;
  font-weight: 500;
  color: var(--g600);
  text-transform: uppercase;
  letter-spacing: .8px;
  margin-bottom: 6px;
}
.cmp-card-title.blue { color: var(--bl600); }
.cmp-row {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 2px;
}
.cmp-row span:last-child { color: var(--ink); font-weight: 500; }

/* ── Right panel metrics ──────────────────────────────────── */
.metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.metric-card {
  background: white;
  border: 1px solid var(--stone);
  border-radius: 7px;
  padding: 8px 6px;
  text-align: center;
}
.metric-val {
  font-family: 'Fraunces', serif;
  font-size: 18px;
  font-weight: 600;
  color: var(--g600);
  line-height: 1.1;
}
.metric-val.accent-brown { color: var(--b600); }
.metric-val.accent-blue  { color: var(--bl600); }
.metric-val.accent-green { color: var(--g400); }
.metric-name { font-size: 9px; color: var(--muted); margin-top: 2px; }

/* Legend */
.legend { display: flex; flex-direction: column; gap: 5px; }
.legend-row { display: flex; align-items: center; gap: 7px; font-size: 10px; color: var(--muted); }
.legend-dot { width: 12px; height: 12px; border-radius: 2px; flex-shrink: 0; border: 1px solid rgba(0,0,0,.06); }

/* Algo info box */
.algo-info-box {
  background: white;
  border: 1px solid var(--stone);
  border-radius: 7px;
  padding: 10px;
  font-size: 10px;
  color: var(--ink2);
  line-height: 1.6;
}
.info-title {
  font-family: 'Fraunces', serif;
  font-size: 13px;
  color: var(--g800);
  margin-bottom: 4px;
}
.info-body { color: var(--muted); margin-bottom: 6px; }
.info-tags { display: flex; gap: 4px; flex-wrap: wrap; }
.tag {
  font-size: 9px;
  padding: 2px 6px;
  border-radius: 10px;
  font-weight: 500;
}
.tag.green { background: var(--g50);  color: var(--g600);  border: 1px solid var(--g100); }
.tag.blue  { background: var(--bl50); color: var(--bl600); border: 1px solid var(--bl100); }
.tag.brown { background: var(--b50);  color: var(--b600);  border: 1px solid var(--b100); }

/* ── Scrollbars ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--stone); border-radius: 3px; }