/* Estilos compartidos para todo el sistema */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --light-gray: #ecf0f1;
    --medium-gray: #bdc3c7;
    --dark-gray: #7f8c8d;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--light-gray) 0%, var(--white) 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Botones */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    min-width: 120px;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color), #2980b9);
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2980b9, var(--accent-color));
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #229954);
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-success:hover {
    background: linear-gradient(135deg, #229954, var(--success-color));
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), #c0392b);
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-danger:hover {
    background: linear-gradient(135deg, #c0392b, var(--danger-color));
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--medium-gray);
    color: var(--primary-color);
    box-shadow: var(--shadow);
}

.btn-secondary:hover {
    background: var(--dark-gray);
    color: var(--white);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

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

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 30px;
    margin-bottom: 20px;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.card-header {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--light-gray);
}

.card-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.card-subtitle {
    font-size: 14px;
    color: var(--dark-gray);
}

/* Formularios */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--primary-color);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 14px;
    transition: var(--transition);
    background: var(--white);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-control:invalid {
    border-color: var(--danger-color);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 12px center;
    background-repeat: no-repeat;
    background-size: 16px;
    padding-right: 40px;
}

/* Grid */
.grid {
    display: grid;
    gap: 20px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Alertas */
.alert {
    padding: 15px 20px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    border-left: 4px solid;
    animation: slideIn 0.3s ease;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-color: var(--success-color);
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border-color: var(--danger-color);
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border-color: var(--warning-color);
}

.alert-info {
    background: #cce7ff;
    color: #004085;
    border-color: var(--accent-color);
}

/* Loading */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--light-gray);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s ease-in-out infinite;
}

/* Animaciones */
@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.5s ease;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background-color: var(--white);
    margin: 5% auto;
    padding: 30px;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-hover);
    animation: slideIn 0.3s ease;
}

.close {
    color: var(--dark-gray);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.close:hover {
    color: var(--danger-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .card {
        padding: 20px;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 10px;
    }
}

/* Utilidades */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 10px; }
.gap-2 { gap: 20px; }