:root {
  --bg-color: #0f0f0f;
  --card-bg: #1a1a1a;
  --card-border: #2a2a2a;
  --accent: #FF6B35;
  --accent-hover: #e55a25;
  --text-main: #ffffff;
  --text-sec: #aaaaaa;
  --success: #2ecc71;
  --error: #e74c3c;
  --font-family: system-ui, -apple-system, sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.6;
  padding: 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* Steps indicator */
.steps {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 1rem;
  justify-content: space-between;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.step {
  color: var(--text-sec);
  font-weight: bold;
  transition: color 0.3s;
}
.step.active {
  color: var(--accent);
}

/* Grid Layout */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 768px) {
  .grid { grid-template-columns: 350px 1fr; }
}

/* Card */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 1.5rem;
}

/* Tabs (Pill Buttons) */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  background: var(--bg-color);
  padding: 0.25rem;
  border-radius: 50px;
}
.tab {
  flex: 1;
  background: transparent;
  color: var(--text-sec);
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  transition: all 0.3s;
  font-weight: bold;
}
.tab.active {
  background: var(--accent);
  color: #fff;
}

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

/* Forms & Controls */
label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-sec);
  font-size: 0.9rem;
  margin-top: 1rem;
}
label:first-child { margin-top: 0; }

input[type="text"], input[type="email"], input[type="file"], textarea, select {
  width: 100%;
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  background: var(--bg-color);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  border-radius: 8px;
  font-family: inherit;
}
textarea { resize: vertical; min-height: 100px; }

.btn {
  display: inline-block;
  width: 100%;
  padding: 0.75rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  text-align: center;
  transition: background 0.2s, opacity 0.2s;
  margin-top: 1rem;
}
.btn:hover:not(:disabled) { background: var(--accent-hover); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Material Category Tabs */
.material-tabs {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  border-bottom: 1px solid var(--card-border);
  overflow-x: auto;
}
.mat-tab {
  background: transparent;
  color: var(--text-sec);
  border: none;
  cursor: pointer;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.mat-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Swatches */
.swatch-container {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}
.swatch {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 3px solid transparent;
  cursor: pointer;
  transition: border-color 0.2s;
}
.swatch.active {
  border-color: var(--accent);
}

/* Right Column (Sticky Preview) */
.preview-wrapper {
  position: sticky;
  top: 20px;
}

.preview-wrapper .card {
  background: transparent;
}

/* NOTE: The following PNG files must exist in the Laserpreview/assets folder:
   bg_wood.png
   bg_leather.png
   bg_metal.png
   bg_plastic.png
*/
.preview-container {
  border: 1px solid var(--card-border);
  border-radius: 8px;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.preview-bg {
  background-color: #ffffff;
  background-size: cover;
  background-position: center;
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 8px;
  overflow: hidden;
  z-index: 0;
}

.preview-bg[data-material="wood"]    { background-image: url('../bg_wood.png'); }
.preview-bg[data-material="leather"] { background-image: url('../bg_leather.png'); }
.preview-bg[data-material="metal"]   { background-image: url('../bg_metal.png'); }
.preview-bg[data-material="plastic"] { background-image: url('../bg_plastic.png'); }

.preview-tint {
  position: absolute;
  inset: 0;
  mix-blend-mode: multiply;
  opacity: 0.5;
  z-index: 1;
  pointer-events: none;
  transition: background-color 0.3s ease;
}

.preview-container img, .preview-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;
  z-index: 2;
}

.preview-bg::after {
  content: 'PREVIEW';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-35deg);
  font-size: 4rem;
  font-weight: 900;
  color: rgba(0, 0, 0, 0.08);
  pointer-events: none;
  user-select: none;
  z-index: 3;
  white-space: nowrap;
  letter-spacing: 0.3em;
}

.empty-state { color: var(--text-sec); z-index: 4; }

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}
.modal {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 2rem;
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}
.modal h2 { margin-bottom: 1.5rem; }
.close-modal {
  float: right;
  background: none; border: none;
  color: var(--text-sec);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Loading Overlay */
#loading-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15, 15, 15, 0.8);
  z-index: 3000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
#loading-overlay.active {
  opacity: 1;
  pointer-events: auto;
}
.spinner {
  border: 4px solid var(--card-border);
  border-top: 4px solid var(--accent);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin-bottom: 1rem;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* Toast Container */
#toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 4000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.toast {
  padding: 1rem 1.5rem;
  border-radius: 8px;
  color: #fff;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  box-shadow: 0 4px 15px rgba(0,0,0,0.5);
  animation: slideIn 0.3s ease-out forwards, slideOut 0.3s ease-in 3.7s forwards;
}
.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--error); }
@keyframes slideIn { from { transform: translateX(120%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes slideOut { from { transform: translateX(0); opacity: 1; } to { transform: translateX(120%); opacity: 0; } }

.hidden { display: none !important; }