/* ===== RESET & VARS ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0a0f;
  --surface: #111118;
  --surface2: #1a1a24;
  --border: #2a2a3a;
  --border-bright: #3a3a55;
  --accent: #00f5c4;
  --accent2: #7c5cfc;
  --accent3: #ff6b6b;
  --accent4: #ffd166;
  --text: #e8e8f0;
  --text-muted: #6b6b8a;
  --text-dim: #3a3a55;
  --path-color: #00f5c4;
  --visited-color: #1f2d45;
  --visited-border: #1a3a5c;
  --wall-color: #0d0d14;
  --agent-color: #7c5cfc;
  --goal-color: #ff6b6b;
  --weight-color: #2a2010;
  --weight-border: #ffd166;
  --font-mono: 'Space Mono', monospace;
  --font-display: 'Syne', sans-serif;
  --cell: 44px;
  --gap: 3px;
  --radius: 8px;
  --transition: 0.15s ease;
}

/* ===== NOISE OVERLAY ===== */
.noise {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  opacity: 0.4;
}

/* ===== BASE ===== */
html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== LAYOUT ===== */
.layout {
  display: flex;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  padding-bottom: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.brand-icon {
  font-size: 28px;
  color: var(--accent);
  animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { text-shadow: 0 0 8px var(--accent); opacity: 1; }
  50% { text-shadow: 0 0 20px var(--accent), 0 0 40px var(--accent); opacity: 0.8; }
}

.brand-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 3px;
  color: var(--text);
}

.brand-sub {
  font-size: 9px;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-top: 2px;
}

/* ===== PANELS ===== */
.panel {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.panel-label {
  font-size: 9px;
  letter-spacing: 3px;
  color: var(--text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
}

/* ===== ALGO CARDS ===== */
.algo-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.algo-opt input { display: none; }

.algo-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--surface2);
  position: relative;
}

.algo-opt input:checked + .algo-card {
  border-color: var(--accent);
  background: rgba(0, 245, 196, 0.05);
  box-shadow: inset 0 0 0 1px rgba(0,245,196,0.1);
}

.algo-card:hover {
  border-color: var(--border-bright);
  background: rgba(255,255,255,0.03);
}

.algo-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 13px;
  color: var(--text);
  min-width: 55px;
}

.algo-opt input:checked + .algo-card .algo-name {
  color: var(--accent);
}

.algo-desc {
  font-size: 10px;
  color: var(--text-muted);
  flex: 1;
}

.algo-badge {
  font-size: 8px;
  letter-spacing: 1px;
  padding: 2px 6px;
  border-radius: 3px;
  background: rgba(0,245,196,0.1);
  color: var(--accent);
  text-transform: uppercase;
  border: 1px solid rgba(0,245,196,0.2);
}

.algo-badge.best {
  background: rgba(124,92,252,0.15);
  color: var(--accent2);
  border-color: rgba(124,92,252,0.3);
}

.algo-badge.warn {
  background: rgba(255,107,107,0.1);
  color: var(--accent3);
  border-color: rgba(255,107,107,0.2);
}

/* ===== TOOLS ===== */
.tools-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 8px;
}

.tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.tool-btn:hover {
  border-color: var(--border-bright);
  color: var(--text);
}

.tool-btn.active {
  border-color: var(--accent4);
  color: var(--accent4);
  background: rgba(255,209,102,0.05);
  box-shadow: 0 0 8px rgba(255,209,102,0.1);
}

.weight-info {
  font-size: 9px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

/* ===== SPEED SLIDER ===== */
.speed-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.speed-label {
  font-size: 9px;
  color: var(--text-muted);
  letter-spacing: 1px;
  white-space: nowrap;
}

.slider {
  -webkit-appearance: none;
  flex: 1;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 6px var(--accent);
}

/* ===== PRESETS ===== */
.preset-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.preset-btn {
  padding: 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.preset-btn:hover {
  border-color: var(--accent2);
  color: var(--accent2);
  background: rgba(124,92,252,0.05);
}

/* ===== ACTION BUTTONS ===== */
.action-btns {
  padding: 16px 20px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.btn-run {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 3px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: uppercase;
  box-shadow: 0 0 20px rgba(0,245,196,0.3);
}

.btn-run:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 30px rgba(0,245,196,0.5);
}

.btn-run:active { transform: translateY(0); }

.btn-run.running {
  background: var(--accent4);
  box-shadow: 0 0 20px rgba(255,209,102,0.3);
  pointer-events: none;
}

.btn-icon { font-size: 14px; }

.btn-clear, .btn-reset {
  padding: 9px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.btn-clear:hover { border-color: var(--accent2); color: var(--accent2); }
.btn-reset:hover { border-color: var(--accent3); color: var(--accent3); }

/* ===== MAIN AREA ===== */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 40px;
  gap: 24px;
  min-height: 100vh;
  overflow: auto;
}

/* ===== STAT CARDS ===== */
.top-bar {
  display: flex;
  gap: 16px;
  width: 100%;
  max-width: 560px;
}

.stat-card {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 12px;
  text-align: center;
  transition: all 0.3s ease;
}

.stat-card.updated {
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(0,245,196,0.15);
}

.stat-val {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 6px;
}

.stat-key {
  font-size: 7px;
  letter-spacing: 2px;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* ===== GRID ===== */
.grid-wrapper {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 0 40px rgba(0,0,0,0.5);
}

#grid {
  display: grid;
  grid-template-columns: repeat(14, var(--cell));
  gap: var(--gap);
}

.cell {
  width: var(--cell);
  height: var(--cell);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: crosshair;
  transition: background 0.1s ease, border-color 0.1s ease, transform 0.05s ease;
  position: relative;
  user-select: none;
}

.cell:hover { border-color: var(--border-bright); transform: scale(1.05); z-index: 2; }

/* cell states */
.cell.wall {
  background: var(--wall-color);
  border-color: #1a1a25;
  cursor: pointer;
}

.cell.agent {
  background: var(--agent-color);
  border-color: rgba(124,92,252,0.6);
  box-shadow: 0 0 10px rgba(124,92,252,0.6), inset 0 0 6px rgba(255,255,255,0.1);
  cursor: pointer;
}

.cell.agent::after {
  content: '▲';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: rgba(255,255,255,0.9);
}

.cell.goal {
  background: var(--goal-color);
  border-color: rgba(255,107,107,0.6);
  box-shadow: 0 0 10px rgba(255,107,107,0.6), inset 0 0 6px rgba(255,255,255,0.1);
  cursor: pointer;
}

.cell.goal::after {
  content: '★';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: rgba(255,255,255,0.9);
}

.cell.weighted {
  background: var(--weight-color);
  border-color: var(--weight-border);
}

.cell.weighted::after {
  content: '◉';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--accent4);
  opacity: 0.7;
}

.cell.visited {
  background: var(--visited-color);
  border-color: var(--visited-border);
  animation: fadeVisited 0.2s ease forwards;
}

@keyframes fadeVisited {
  from { background: rgba(0,120,200,0.4); }
  to { background: var(--visited-color); }
}

.cell.path {
  background: rgba(0,245,196,0.15);
  border-color: var(--path-color);
  box-shadow: 0 0 6px rgba(0,245,196,0.3), inset 0 0 4px rgba(0,245,196,0.1);
  animation: popPath 0.2s ease forwards;
  z-index: 1;
}

@keyframes popPath {
  0% { transform: scale(0.8); opacity: 0.5; }
  60% { transform: scale(1.08); }
  100% { transform: scale(1); opacity: 1; }
}

.cell.wall-anim {
  animation: wallPop 0.12s ease;
}

@keyframes wallPop {
  0% { transform: scale(0.8); }
  60% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

/* ===== LEGEND ===== */
.legend {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.legend-swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.legend-swatch.agent { background: var(--agent-color); border-color: rgba(124,92,252,0.6); }
.legend-swatch.goal { background: var(--goal-color); border-color: rgba(255,107,107,0.6); }
.legend-swatch.wall { background: var(--wall-color); border-color: #1a1a25; }
.legend-swatch.weight-cell { background: var(--weight-color); border-color: var(--weight-border); }
.legend-swatch.visited { background: var(--visited-color); border-color: var(--visited-border); }
.legend-swatch.path { background: rgba(0,245,196,0.2); border-color: var(--path-color); }

/* ===== STATUS BAR ===== */
#status-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 1px;
  width: 100%;
  max-width: 560px;
}

#status-icon {
  color: var(--accent);
  font-size: 14px;
  animation: pulse-glow 2s ease-in-out infinite;
}

#status-bar.success { border-color: var(--accent); }
#status-bar.success #status-icon { color: var(--accent); }
#status-bar.error { border-color: var(--accent3); }
#status-bar.error #status-icon { color: var(--accent3); }
#status-bar.running { border-color: var(--accent4); }
#status-bar.running #status-icon { color: var(--accent4); }