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

:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #1f2937;
    --light: #f9fafb;
    --border: #e5e7eb;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--dark);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.8em;
    margin-bottom: 10px;
}

.tabs {
    display: flex;
    background: #f8fafc;
    border-bottom: 2px solid var(--border);
    overflow-x: auto;
}

.tab {
    flex: 1;
    min-width: 150px;
    padding: 20px 15px;
    text-align: center;
    cursor: pointer;
    font-weight: 600;
    color: #64748b;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.tab:hover {
    background: #f1f5f9;
    color: #475569;
}

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

.tab-content {
    display: none;
    padding: 40px;
}

.tab-content.active {
    display: block;
}

.form-section {
    margin-bottom: 40px;
}

.section-title {
    font-size: 1.5em;
    color: var(--dark);
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--primary);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
    font-size: 0.95em;
}

.required {
    color: var(--danger);
    margin-left: 4px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1em;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.image-upload-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.image-upload {
    border: 3px dashed var(--primary);
    border-radius: 12px;
    padding: 30px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #f8f9ff 0%, #e9ecff 100%);
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.image-upload:hover {
    background: linear-gradient(135deg, #e9ecff 0%, #dce1ff 100%);
    transform: translateY(-3px);
}

.image-upload.has-image {
    border-style: solid;
    padding: 10px;
    background: white;
}

.image-preview {
    max-width: 100%;
    max-height: 180px;
    border-radius: 8px;
    object-fit: contain;
}

.btn {
    padding: 14px 32px;
    border: none;
    border-radius: 10px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.alert {
    padding: 16px 20px;
    border-radius: 10px;
    margin-bottom: 25px;
    border-left: 4px solid;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left-color: var(--success);
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border-left-color: var(--danger);
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border-left-color: #3b82f6;
}

.productos-grid {
    display: grid;
    gap: 20px;
}

.producto-card {
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    gap: 20px;
    transition: all 0.3s ease;
}

.producto-card:hover {
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    border-color: var(--primary);
}

.producto-imagen {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: 10px;
    background: var(--light);
}

.producto-info {
    flex: 1;
}

.producto-nombre {
    font-size: 1.2em;
    font-weight: 700;
    margin-bottom: 5px;
}

.badge {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 600;
    margin-right: 6px;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.loading {
    text-align: center;
    padding: 60px 20px;
}

.spinner {
    border: 4px solid var(--light);
    border-top: 4px solid var(--primary);
    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); }
}

@media (max-width: 768px) {
    .container {
        border-radius: 0;
        margin: -20px;
    }
    .tab-content {
        padding: 20px;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
}