:root {
  --bg-dark: #080c0a;
  --bg-card: #111916;
  --bg-input: #0d1210;
  --grass: #57d97b;
  --grass-light: #3bbf63;
  --water: #1a3a5c;
  --water-dark: #0f2438;
  --wall: #e8b86d;
  --wall-glow: #ffcc88;
  --horse: #ffffff;
  --cherry: #ff3b3b;
  --cherry-leaf: #2ecc71;
  --accent: #5dff88;
  --accent-dim: #3a9956;
  --text: #e0f0e4;
  --text-dim: #6a8a72;
  --danger: #ff5858;
  --enclosed: #ff8c0055;
  --enclosed-border: #ffb000;
}

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

body {
  font-family: "JetBrains Mono", monospace;
  background: var(--bg-dark);
  background-image:
    radial-gradient(ellipse at 20% 20%, rgba(45, 90, 61, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(26, 58, 92, 0.1) 0%, transparent 50%);
  color: var(--text);
  min-height: 100vh;
}

.container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 1.5rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
  padding: 1rem;
  border-bottom: 1px solid rgba(93, 255, 136, 0.1);
}

h1 {
  font-family: "Bebas Neue", sans-serif;
  font-size: 3.5rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-shadow: 0 0 60px rgba(93, 255, 136, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

h1 .icon {
  font-size: 2.5rem;
}

.subtitle {
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  margin-top: 0.5rem;
}

.app-grid {
  display: grid;
  grid-template-columns: 380px minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

/* Reduce config panel width at medium screens */
@media (max-width: 1200px) {
  .app-grid {
    grid-template-columns: 340px minmax(0, 1fr);
    gap: 1.25rem;
  }
}

@media (max-width: 1000px) {
  .container {
    padding: 1rem;
  }

  .app-grid {
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 1rem;
  }
}

/* Stack vertically when solution width would be smaller than config width */
@media (max-width: 800px) {
  .app-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .panel-config {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
  }

  .panel-solution {
    width: 100%;
  }

  /* Force stats to 2 columns in vertical mode */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 0.75rem;
  }
}

.panel {
  background: var(--bg-card);
  border: 1px solid rgba(93, 255, 136, 0.08);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.panel-header {
  background: linear-gradient(135deg, rgba(93, 255, 136, 0.1), transparent);
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(93, 255, 136, 0.08);
}

.panel-title {
  font-family: "Bebas Neue", sans-serif;
  font-size: 1.25rem;
  letter-spacing: 0.15em;
  color: var(--accent);
}

.panel-body {
  padding: 1.25rem;
  flex: 1 1 auto;
  min-height: 0;
}

.upload-zone {
  border: 2px dashed rgba(93, 255, 136, 0.3);
  border-radius: 8px;
  padding: 2rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: rgba(45, 90, 61, 0.05);
}

.upload-zone:hover {
  border-color: var(--accent);
  background: rgba(45, 90, 61, 0.1);
}

.upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(93, 255, 136, 0.1);
  transform: scale(1.01);
}

.upload-zone.has-image {
  padding: 0.75rem;
}

.upload-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.upload-text {
  color: var(--text-dim);
  font-size: 0.8rem;
}

#fileInput {
  display: none;
}

#preview {
  max-width: 100%;
  border-radius: 4px;
  display: none;
}

.form-group {
  margin-top: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

label {
  display: block;
  color: var(--text-dim);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
}

input[type="number"] {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid rgba(93, 255, 136, 0.15);
  border-radius: 6px;
  padding: 0.7rem 1rem;
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  transition: all 0.2s ease;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(93, 255, 136, 0.1);
}

.btn {
  font-family: "Bebas Neue", sans-serif;
  font-size: 1.1rem;
  letter-spacing: 0.15em;
  padding: 0.9rem 1.5rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: uppercase;
  width: 100%;
  margin-top: 1.25rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: var(--bg-dark);
  font-weight: 600;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(93, 255, 136, 0.3);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.status {
  padding: 0.7rem 1rem;
  border-radius: 6px;
  margin-top: 1rem;
  font-size: 0.8rem;
  display: none;
}

.status.success {
  display: block;
  background: rgba(93, 255, 136, 0.1);
  border: 1px solid rgba(93, 255, 136, 0.3);
  color: var(--accent);
}

.status.error {
  display: block;
  background: rgba(255, 88, 88, 0.1);
  border: 1px solid rgba(255, 88, 88, 0.3);
  color: var(--danger);
}

.status.warning {
  display: block;
  background: rgba(255, 176, 0, 0.12);
  border: 1px solid rgba(255, 176, 0, 0.35);
  color: var(--enclosed-border);
}

.help-text {
  margin-top: 0.4rem;
  font-size: 0.7rem;
  color: var(--text-dim);
  line-height: 1.35;
}

.auto-detect-info {
  background: var(--bg-input);
  padding: 0.75rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.auto-detect-info strong {
  color: var(--accent);
}

/* Results Panel */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

/* Shrink stats to 2 columns when solution panel gets narrow */
@media (max-width: 1100px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1rem;
  }
}

.stat-box {
  background: var(--bg-input);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
}

/* Shrink stat boxes when narrow */
@media (max-width: 1100px) {
  .stat-box {
    padding: 0.75rem;
  }

  .stat-value {
    font-size: 2rem;
  }
}

.stat-value {
  font-family: "Bebas Neue", sans-serif;
  font-size: 2.5rem;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

.canvas-container {
  background: var(--bg-input);
  border-radius: 8px;
  padding: 1rem;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

#gridCanvas {
  display: block;
  border-radius: 4px;
  image-rendering: pixelated;
  cursor: crosshair;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 1rem;
  padding: 0.75rem;
  background: var(--bg-input);
  border-radius: 6px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.7rem;
  color: var(--text-dim);
}

.legend-color {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.wall-coords {
  margin-top: 1rem;
  background: var(--bg-input);
  border-radius: 6px;
  padding: 1rem;
  max-height: 150px;
  overflow-y: auto;
  font-size: 0.75rem;
}

.wall-coords::-webkit-scrollbar {
  width: 6px;
}

.wall-coords::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

.wall-coords::-webkit-scrollbar-thumb {
  background: var(--accent-dim);
  border-radius: 3px;
}

.wall-coords-title {
  color: var(--text-dim);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.wall-coord-item {
  display: inline-block;
  background: rgba(232, 184, 109, 0.15);
  color: var(--wall);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  margin: 0.15rem;
  font-size: 0.7rem;
}

.loading-overlay {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(8, 12, 10, 0.9);
  border-radius: 8px;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 1rem;
}

.loading-overlay.active {
  display: flex;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--bg-dark);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  color: var(--text-dim);
  text-align: center;
  padding: 2rem;
}

/* Desktop side-by-side: keep the whole app in-view (no page scroll). Panels scroll internally if needed. */
@media (min-width: 801px) {
  body {
    height: 100vh;
    overflow: hidden;
  }

  .container {
    height: 100vh;
    display: flex;
    flex-direction: column;
  }

  header {
    margin-bottom: 1rem;
    flex: 0 0 auto;
  }

  .app-grid {
    flex: 1 1 auto;
    min-height: 0;
    align-items: stretch;
  }

  .panel-config .panel-body {
    overflow: auto;
  }

  .panel-solution .panel-body {
    overflow: hidden;
  }

  #resultsContent {
    height: 100%;
    display: flex;
    flex-direction: column;
    min-height: 0;
  }

  .canvas-container {
    flex: 1 1 auto;
    min-height: 0;
  }

  .wall-coords {
    max-height: min(160px, 18vh);
  }

  .panel-solution .placeholder {
    min-height: 0;
    flex: 1 1 auto;
  }
}

/* Mobile/tablet vertical stack: allow page scroll, natural flow */
@media (max-width: 800px) {
  body {
    height: auto;
    min-height: 100vh;
    overflow-y: auto;
  }

  .container {
    height: auto;
    min-height: 100vh;
    padding: 1rem;
  }

  .app-grid {
    height: auto;
    min-height: auto;
  }

  .panel {
    height: auto;
    max-height: none;
  }

  .panel-body {
    overflow: visible;
    padding: 1rem;
  }

  .panel-solution .panel-body {
    overflow: visible;
  }

  #resultsContent {
    display: flex;
    flex-direction: column;
    height: auto;
    gap: 1rem;
  }

  .canvas-container {
    width: 100%;
    min-height: 400px;
    height: auto;
  }

  .wall-coords {
    max-height: 200px;
  }

  .legend {
    flex-wrap: wrap;
  }
}

/* Very small screens: single column stats */
@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .stat-box {
    padding: 0.6rem;
  }

  .stat-value {
    font-size: 1.8rem;
  }
}

.placeholder-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.3;
}

.placeholder-text {
  font-size: 0.9rem;
  max-width: 300px;
}

#detectionCanvas {
  display: none;
}

.debug-toggle {
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}

.debug-toggle:hover {
  color: var(--accent);
}

.debug-info {
  display: none;
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-input);
  border-radius: 6px;
  font-size: 0.7rem;
  color: var(--text-dim);
}

.debug-info.visible {
  display: block;
}