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

body {
  font-family: system-ui, sans-serif;
  background: #f5f5f5;
  color: #222;
  min-height: 100vh;
}

header {
  background: #fff;
  border-bottom: 1px solid #ddd;
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 10;
}

header h1 { font-size: 1.2rem; margin-bottom: 0.75rem; }

nav { display: flex; gap: 0.5rem; }

.tab-btn {
  padding: 0.4rem 1rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  font-size: 0.9rem;
}

.tab-btn.active {
  background: #222;
  color: #fff;
  border-color: #222;
}

main { padding: 1.5rem; max-width: 900px; margin: 0 auto; }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* --- Shared component classes (used across tabs) --- */
.color-preview {
  width: 100%;
  height: 80px;
  border-radius: 8px;
  border: 1px solid #ddd;
  margin-bottom: 0.75rem;
}

.color-codes {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.color-code-group { display: flex; flex-direction: column; gap: 0.25rem; }
.color-code-group label { font-size: 0.75rem; color: #666; text-transform: uppercase; }
.color-code-group input {
  padding: 0.4rem 0.6rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-family: monospace;
  font-size: 0.9rem;
  width: 140px;
}

button.action-btn {
  padding: 0.4rem 0.9rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  font-size: 0.85rem;
}

button.action-btn:hover { background: #f0f0f0; }

.swatch {
  display: inline-block;
  width: 40px;
  height: 40px;
  border-radius: 6px;
  border: 1px solid #ddd;
  cursor: pointer;
  vertical-align: middle;
}

#picker-dropzone {
  border: 2px dashed #ccc;
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  margin-bottom: 1rem;
  background: #fafafa;
}

#picker-dropzone.drag-over {
  border-color: #222;
  background: #f0f0f0;
}

#picker-dropzone p { margin-bottom: 0.75rem; color: #666; font-size: 0.9rem; }