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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

header p {
    font-size: 1.2em;
    opacity: 0.9;
}

main {
    padding: 30px;
}

.info-section {
    background: #e7f3ff;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
    border-left: 4px solid #2196F3;
}

.info-section h3 {
    color: #1976D2;
    margin-bottom: 15px;
}

.info-section code {
    background: #f5f5f5;
    padding: 5px 10px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    display: block;
    margin: 10px 0;
    font-size: 0.9em;
}

.scanner-info {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 8px;
    padding: 15px;
    margin-top: 20px;
    text-align: center;
}

.filtros-busqueda {
    margin-bottom: 20px;
}

.filtros-tipo {
    margin-bottom: 15px;
}

.filtros-tipo label {
    display: block;
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    font-size: 1em;
}

.tipo-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-filtro {
    background: #f8f9fa;
    border: 2px solid #dee2e6;
    color: #495057;
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 500;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 150px;
    text-align: center;
}

.btn-filtro:hover {
    background: #e9ecef;
    border-color: #4CAF50;
    transform: translateY(-1px);
}

.btn-filtro.active {
    background: #4CAF50;
    border-color: #4CAF50;
    color: white;
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.filtros-busqueda input {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1em;
}

.filtros-busqueda input:focus {
    outline: none;
    border-color: #4CAF50;
}

.productos-stats {
    background: #e8f5e8;
    padding: 10px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: bold;
    color: #2e7d32;
    border-left: 4px solid #4CAF50;
}

.scanner-section {
    text-align: center;
    margin-bottom: 30px;
}

.scanner-controls {
    margin-bottom: 20px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    cursor: pointer;
    margin: 5px;
    transition: all 0.3s ease;
    font-weight: bold;
}

.btn-primary {
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, #45a049 0%, #3d8b40 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: linear-gradient(135deg, #6c757d 0%, #5a6268 100%);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background: linear-gradient(135deg, #5a6268 0%, #495057 100%);
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

#qr-reader {
    border: 3px dashed #ddd;
    border-radius: 10px;
    padding: 20px;
    background: #f8f9fa;
}

.manual-input {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.manual-input label {
    font-weight: bold;
    display: block;
    margin-bottom: 10px;
    color: #333;
}

.input-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

.input-group input {
    flex: 1;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1em;
}

.input-group input:focus {
    outline: none;
    border-color: #4CAF50;
}

.resultados-section {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    margin-top: 30px;
    border-left: 4px solid #4CAF50;
}

.resultados-section h2 {
    color: #333;
    margin-bottom: 20px;
}

.producto-card {
    background: white;
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    border: 1px solid #e1e8ed;
    transition: all 0.3s ease;
    position: relative;
    display: grid;
    grid-template-columns: auto 1fr auto;
    grid-template-rows: auto auto auto;
    gap: 10px;
    align-items: start;
}

.producto-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border-color: #4CAF50;
}

.producto-numero {
    grid-column: 3;
    grid-row: 1;
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    padding: 5px 8px;
    border-radius: 12px;
    font-size: 0.75em;
    font-weight: 600;
    text-align: center;
    min-width: 32px;
    box-shadow: 0 1px 4px rgba(76, 175, 80, 0.3);
}

.producto-codigo {
    grid-column: 1;
    grid-row: 1;
    font-family: 'Courier New', monospace;
    background: #f8f9fa;
    padding: 6px 8px;
    border-radius: 6px;
    font-size: 0.8em;
    color: #495057;
    border: 1px solid #dee2e6;
    font-weight: 500;
    letter-spacing: 0.3px;
}

.producto-descripcion {
    grid-column: 1 / -1;
    grid-row: 2;
    font-size: 1em;
    font-weight: 600;
    color: #2c3e50;
    line-height: 1.3;
    margin: 0;
}

.producto-precio {
    grid-column: 1 / -1;
    grid-row: 3;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
}

.precio-valor {
    font-size: 1.6em;
    font-weight: 700;
    color: #4CAF50;
    margin: 0;
    line-height: 1;
}

.precio-iva {
    font-size: 0.7em;
    color: #6c757d;
    text-transform: uppercase;
    font-weight: 500;
    letter-spacing: 0.3px;
    background: #e8f5e8;
    padding: 3px 6px;
    border-radius: 4px;
    border: 1px solid #c3e6cb;
}

/* Diseño responsivo para móviles */
@media (max-width: 768px) {
    .producto-card {
        padding: 12px;
        margin-bottom: 10px;
        grid-template-columns: 1fr auto;
        grid-template-rows: auto auto auto auto;
        gap: 8px;
    }
    
    .producto-numero {
        grid-column: 2;
        grid-row: 1;
        padding: 4px 6px;
        font-size: 0.7em;
    }
    
    .producto-codigo {
        grid-column: 1;
        grid-row: 1;
        font-size: 0.75em;
        padding: 4px 6px;
    }
    
    .producto-descripcion {
        grid-column: 1 / -1;
        grid-row: 2;
        font-size: 0.95em;
    }
    
    .producto-precio {
        grid-column: 1 / -1;
        grid-row: 3;
    }
    
    .precio-valor {
        font-size: 1.4em;
    }
}

.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #4CAF50;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #dc3545;
    margin-top: 20px;
}

.no-productos {
    text-align: center;
    padding: 40px;
    color: #6c757d;
}

.no-productos .emoji {
    font-size: 3em;
    margin-bottom: 15px;
    display: block;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        border-radius: 10px;
    }
    
    header {
        padding: 20px;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    main {
        padding: 20px;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .input-group input,
    .input-group button {
        width: 100%;
    }
    
    .scanner-controls {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    
    .scanner-controls .btn {
        width: 100%;
    }
}