:root { --primary: #2563eb; --font-main: sans-serif; }
body { font-family: var(--font-main); background-color: #f3f4f6; transition: 0.3s; }
.card { background: white; border-radius: 1.5rem; box-shadow: 0 4px 15px rgba(0,0,0,0.05); }
.btn-main { background: var(--primary); color: white; width: 100%; padding: 14px; border-radius: 1rem; font-weight: bold; border: none; }
.upload-area { border: 2px dashed #cbd5e1; border-radius: 1rem; padding: 25px; text-align: center; background: #f8fafc; cursor: pointer; }
.preview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 15px; }
.preview-item img { width: 100%; aspect-ratio: 1/1; object-fit: cover; border-radius: 0.75rem; }
.progress-bar { height: 8px; background: #e2e8f0; border-radius: 10px; overflow: hidden; display: none; margin-top: 10px; }
.progress-fill { height: 100%; background: var(--primary); width: 0%; transition: width 0.2s; }