:root {
  --primary: #f97316;
  --primary-hover: #ea580c;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 40px;
}

h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Tabs */
.tabs {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 32px;
}

.tab-btn {
  padding: 12px 24px;
  border: none;
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tab-btn:hover {
  background: #f1f5f9;
}

.tab-btn.active {
  background: var(--primary);
  color: white;
}

/* Main Layout */
.workspace {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: 24px;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

@media (max-width: 768px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

/* Canvas Area */
.preview-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #f1f5f9;
  border-radius: 8px;
  padding: 24px;
  min-height: 400px;
  border: 2px dashed var(--border);
  position: relative;
}

.preview-area.drag-over {
  border-color: var(--primary);
  background: #fff7ed;
}

#canvas {
  max-width: 100%;
  max-height: 60vh;
  box-shadow: var(--shadow);
  display: none;
}

.upload-prompt {
  text-align: center;
  color: var(--text-secondary);
}

.upload-prompt i {
  font-size: 48px;
  margin-bottom: 16px;
  color: var(--primary);
}

/* Controls Area */
.controls-area {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-group label {
  font-weight: 600;
  font-size: 0.95rem;
}

input[type="text"] {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--primary);
}

/* Range Sliders */
input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Buttons */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary {
  background: var(--primary);
  color: white;
  width: 100%;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-primary:disabled {
  background: #cbd5e1;
  cursor: not-allowed;
}

.btn-secondary {
  background: #f1f5f9;
  color: var(--text);
}

.btn-secondary:hover {
  background: #e2e8f0;
}

/* Actions Row */
.actions-row {
  display: flex;
  gap: 12px;
  margin-top: auto;
}
.actions-row .btn {
  flex: 1;
}

/* Templates Grid */
.templates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.template-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.2s;
}

.template-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.15);
}

.template-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  display: block;
}

.template-card .title {
  padding: 8px;
  font-size: 0.9rem;
  text-align: center;
  font-weight: 500;
}

/* Categories */
.categories {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.category-tag {
  padding: 4px 12px;
  background: #f1f5f9;
  border-radius: 999px;
  font-size: 0.85rem;
  cursor: pointer;
  white-space: nowrap;
}

.category-tag.active {
  background: var(--primary);
  color: white;
}

/* Loading Overlay */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255,255,255,0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10;
  border-radius: 8px;
  display: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 16px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Hidden inputs */
.hidden {
  display: none !important;
}