h1 {
  font-size: 1.4rem;
}

h3 {
  margin-top: 0.25rem;
}

input[type=file] {
  margin-top: 0.25rem;
  margin-bottom: 1rem;
}

textarea {
  width: 100%;
  font-family: monospace;
  font-size: 0.9rem;
}

.hidden {
  display: none;
}

.customization {
  margin-top: 0.5rem;
  border: 1px solid #ccc;
  padding: 0.8rem;
  border-radius: 0.5rem;
}

.customization label {
  display: block;
  margin: 0.5rem 0;
}

body {
  font-family: system-ui, sans-serif;
  max-width: 600px;
  margin: 2rem auto;
  padding: 1rem;
  background: #fafafa;
  color: #222;
}

h1,
h3 {
  color: #333;
}

.customization,
#results {
  background: white;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
  border-radius: 0.5rem;
  padding: 1rem;
  margin-top: 1rem;
}

button {
  border: none;
  background: #ffcc00;
  color: #222;
  font-weight: 600;
  border-radius: 0.3rem;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 0.5rem;
  margin-right: 0.5rem;
  padding: 0.3rem 0.8rem;
}

button:hover {
  background: #ffe94f;
}

/* DETAILS: "Learn more" section styling */
details {
  margin-top: 0.75rem;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 0.4rem;
  padding: 0.6rem 0.8rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  transition: box-shadow 0.2s, border-color 0.2s, background 0.2s;
}

details:hover {
  border-color: #ccc;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
}

summary {
  cursor: pointer;
  font-weight: 600;
}

details p {
  margin: 0.5rem 0 0 1.3rem;
  /* indent content slightly */
  color: #444;
  font-size: 0.95em;
  line-height: 1.4;
}

/* --- Drag and Drop --- */
#dropZone {
  margin-top: 0.5rem;
  padding: 1.5rem;
  border: 2px dashed #ccc;
  border-radius: 0.5rem;
  text-align: center;
  color: #666;
  transition: background 0.2s, border-color 0.2s;
  margin-bottom: 1.5rem;
}

#dropZone.dragover {
  border-color: #ffcc00;
  background: #fff6cc;
  color: #000;
}

#gridCustomization {
  margin-top: 1rem;
  background: white;
  border: 1px solid #ddd;
  border-radius: 0.5rem;
  padding: 1rem;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
}

/* Grid preview itself is just a wrapper around the cell buttons. */
#gridPreview {
  display: grid;
  margin-top: 0.75rem;
  gap: 0.15rem;
  border: 1px solid #ddd;
  border-radius: 0.25rem;
  background: #222;
  /** width: 100%; **/
  padding-left: 0.5rem;
  padding-bottom: 0.5rem;
  /** padding: 0.15rem; **/
  grid-auto-rows: minmax(0, 1fr);
  align-items: stretch;
  justify-items: stretch;
}

.grid-cell {
  position: relative;
  aspect-ratio: 1 / 1;
  min-width: 24px;
  border-radius: 0.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: #111;
  user-select: none;
  transition: box-shadow 0.15s;
  border: none;
  padding: 0;
  background: transparent;
}

.grid-cell.selected {
  box-shadow: 0 0 0 2px #ffcc00 inset;
}

.grid-cell.block {
  background: #111;
  border: 1px solid rgba(255, 255, 255, 0.1);
  cursor: default;
}

.grid-cell .grid-letter {
  font-size: 0.55rem;
  position: absolute;
  top: 0.1rem;
  left: 0.2rem;
  color: rgba(255, 255, 255, 0.8);
}

.grid-letter-solution {
  font-size: 0.9rem;
  font-weight: 700;
  pointer-events: none;
  user-select: none;
}

#cellActions {
  margin-top: 1rem;
  display: grid;
  gap: 0.75rem;
}

#cellActions label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

#cellActions input[type="color"] {
  width: 40px;
  height: 30px;
  padding: 0;
  border: none;
  background: none;
}

.color-history {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.color-history button {
  width: 32px;
  height: 32px;
  border: 1px solid #ccc;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0;
}

.color-history button:focus-visible {
  outline: 2px solid #ffcc00;
}

.cell-actions-footer {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.cell-actions-footer button {
  background: #f2f2f2;
  color: #222;
  border: 1px solid #ccc;
  border-radius: 0.3rem;
  padding: 0.35rem 0.9rem;
}

.cell-actions-footer button.primary {
  background: #ffcc00;
  font-weight: 600;
  border-color: #e3b800;
}