* { box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { background-color: #f4f4f9; margin: 0; padding: 0; color: #333; }

header { background-color: #1e293b; color: white; padding: 2rem; text-align: center; }
header h1 { margin: 0 0 0.5rem 0; }
header p { margin: 0; color: #94a3b8; }

.container { display: flex; gap: 2rem; padding: 2rem; max-width: 1200px; margin: 0 auto; flex-wrap: wrap; }
.card { background: white; border-radius: 8px; padding: 2rem; box-shadow: 0 4px 6px rgba(0,0,0,0.05); flex: 1; min-width: 300px; }
.hidden { display: none !important; }

/* Upload Box */
.upload-box { border: 2px dashed #cbd5e1; border-radius: 8px; padding: 3rem 1rem; text-align: center; background: #f8fafc; margin-bottom: 1.5rem; transition: 0.3s; }
.upload-box:hover { border-color: #3b82f6; background: #eff6ff; }
.btn { background: #2563eb; color: white; border: none; padding: 0.75rem 1.5rem; border-radius: 6px; cursor: pointer; font-weight: bold; font-size: 1rem; transition: 0.2s; }
.btn:hover { background: #1d4ed8; }
.btn-secondary { background: #10b981; width: 100%; margin-top: 1.5rem; }

/* Preview */
#image-preview { max-width: 100%; border: 1px solid #e2e8f0; border-radius: 4px; margin-top: 1rem; }

/* Table */
table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
th, td { text-align: left; padding: 1rem; border-bottom: 1px solid #e2e8f0; }
th { background: #f8fafc; font-weight: 600; color: #475569; }
.total-row { font-weight: bold; background: #f0fdf4; color: #166534; }

/* Spinner */
.spinner { width: 40px; height: 40px; border: 4px solid #f3f3f3; border-top: 4px solid #3b82f6; border-radius: 50%; animation: spin 1s linear infinite; margin: 2rem auto 1rem; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
#loading-spinner { text-align: center; color: #64748b; }