* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, #0f0f12 0%, #1a1a22 50%, #14141a 100%);
  color: #e4e4e7;
  min-height: 100vh;
}

.app {
  min-height: 100vh;
  padding: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

header {
  margin-bottom: 1.5rem;
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: #fafafa;
}

.lang-select-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-label {
  font-size: 0.85rem;
  color: #a1a1aa;
}

#langSelect {
  background: rgba(38, 38, 45, 0.9);
  border: 1px solid rgba(63, 63, 70, 0.6);
  border-radius: 6px;
  color: #e4e4e7;
  padding: 0.35rem 0.6rem;
  font-size: 0.85rem;
  cursor: pointer;
}

main {
  display: grid;
  grid-template-columns: 220px 1fr 220px;
  gap: 1.5rem;
  align-items: start;
  justify-content: center;
}

@media (max-width: 900px) {
  main {
    grid-template-columns: 1fr;
  }
}

.controls, .output {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel {
  background: rgba(38, 38, 45, 0.8);
  border: 1px solid rgba(63, 63, 70, 0.6);
  border-radius: 10px;
  padding: 1.25rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.panel h2 {
  margin: 0 0 0.875rem 0;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #a1a1aa;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.input-row label {
  flex: 0 0 70px;
  font-size: 0.85rem;
  color: #d4d4d8;
}

input[type="number"] {
  width: 80px;
  padding: 0.4rem 0.6rem;
  background: #18181b;
  border: 1px solid #3f3f46;
  border-radius: 6px;
  color: #e4e4e7;
  font-size: 0.9rem;
}

input[type="number"]:focus {
  outline: none;
  border-color: #52525b;
  box-shadow: 0 0 0 2px rgba(82, 82, 91, 0.2);
}

textarea {
  width: 100%;
  padding: 0.6rem;
  margin-bottom: 0.5rem;
  background: #18181b;
  border: 1px solid #3f3f46;
  border-radius: 6px;
  color: #e4e4e7;
  font-family: 'Cascadia Code', 'Consolas', 'Monaco', monospace;
  font-size: 0.78rem;
  resize: vertical;
}

textarea:focus {
  outline: none;
  border-color: #52525b;
}

button {
  padding: 0.45rem 0.9rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  background: #27272a;
  border: 1px solid #3f3f46;
  border-radius: 6px;
  color: #e4e4e7;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

button:hover {
  background: #3f3f46;
  border-color: #52525b;
}

button:active {
  background: #27272a;
}

.canvas-section {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.canvas-with-labels {
  display: inline-grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "corner cols"
    "rows canvas";
  background: #000;
  padding: 1rem;
  border: 1px solid rgba(63, 63, 70, 0.4);
  border-radius: 10px;
  min-height: 200px;
}

.labels-corner {
  grid-area: corner;
  min-width: var(--label-width, 22px);
  background: #000;
}

.col-labels {
  grid-area: cols;
  display: flex;
  flex-direction: row;
}

.col-labels span {
  width: var(--pixel-size, 20px);
  text-align: center;
  font-size: 10px;
  color: #71717a;
  font-family: 'Consolas', 'Monaco', monospace;
}

.row-labels {
  grid-area: rows;
  display: flex;
  flex-direction: column;
}

.row-labels span {
  height: var(--pixel-size, 20px);
  line-height: var(--pixel-size, 20px);
  font-size: 10px;
  color: #71717a;
  padding-right: 6px;
  text-align: right;
  font-family: 'Consolas', 'Monaco', monospace;
}

.canvas-area {
  grid-area: canvas;
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
}

#canvas {
  display: block;
  background: #000;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.output textarea {
  min-height: 100px;
}

.output .panel {
  flex: 1;
}