/* Estilos base del sistema - Gama azul, gris y negro */
:root {
    --primary-blue: #1e3a8a;
    --secondary-blue: #3b82f6;
    --light-blue: #dbeafe;
    --accent-blue: #60a5fa;
    --dark-blue: #1e40af;
    
    --dark-gray: #374151;
    --medium-gray: #6b7280;
    --light-gray: #f3f4f6;
    --border-gray: #e5e7eb;
    
    --black: #111827;
    --dark-black: #000000;
    --white: #ffffff;
    --off-white: #f9fafb;
    
    --gradient-primary: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    --gradient-dark: linear-gradient(135deg, #111827 0%, #374151 100%);
    --gradient-blue: linear-gradient(135deg, #1e40af 0%, #60a5fa 100%);
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 35px rgba(0, 0, 0, 0.2);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset y estilos base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--light-gray);
    color: var(--black);
    line-height: 1.6;
    font-size: 16px;
}

/* Tipografía */
h1, h2, h3, h4, h5, h6 {
    color: var(--black);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--dark-gray);
}

/* Enlaces */
a {
    color: var(--secondary-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-blue);
}

/* Botones base */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    text-align: center;
    line-height: 1;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--white);
}

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

.btn-success {
    background: linear-gradient(135deg, #16a34a 0%, #22c55e 100%);
    color: var(--white);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Formularios */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--black);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-gray);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--white);
    transition: border-color var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control:disabled {
    background: var(--light-gray);
    color: var(--medium-gray);
    cursor: not-allowed;
}

select.form-control {
    cursor: pointer;
}

/* Cards y contenedores */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform var(--transition-normal);
}

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

.card-header {
    padding: 1.5rem;
    background: var(--gradient-primary);
    color: var(--white);
    border-bottom: 1px solid var(--border-gray);
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    background: var(--off-white);
    border-top: 1px solid var(--border-gray);
}

/* Contenedor principal */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.container-fluid {
    width: 100%;
    padding: 0 1rem;
}

/* Grid sistema */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -0.5rem;
}

.col {
    flex: 1;
    padding: 0 0.5rem;
}

.col-2 { flex: 0 0 16.666667%; }
.col-3 { flex: 0 0 25%; }
.col-4 { flex: 0 0 33.333333%; }
.col-6 { flex: 0 0 50%; }
.col-8 { flex: 0 0 66.666667%; }
.col-9 { flex: 0 0 75%; }
.col-12 { flex: 0 0 100%; }

/* Utilidades de espaciado */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-0 { padding: 0; }
.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

/* Utilidades de texto */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-blue); }
.text-secondary { color: var(--medium-gray); }
.text-success { color: #16a34a; }
.text-danger { color: #dc2626; }
.text-warning { color: #d97706; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

/* Utilidades de fondo */
.bg-primary { background: var(--primary-blue); }
.bg-secondary { background: var(--medium-gray); }
.bg-light { background: var(--light-gray); }
.bg-white { background: var(--white); }
.bg-dark { background: var(--black); }

/* Alertas y mensajes */
.alert {
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    border-left: 4px solid;
    margin-bottom: 1rem;
}

.alert-success {
    background: #f0fdf4;
    color: #166534;
    border-left-color: #16a34a;
}

.alert-error {
    background: #fef2f2;
    color: #991b1b;
    border-left-color: #dc2626;
}

.alert-warning {
    background: #fffbeb;
    color: #92400e;
    border-left-color: #d97706;
}

.alert-info {
    background: var(--light-blue);
    color: var(--primary-blue);
    border-left-color: var(--secondary-blue);
}

/* Badges y etiquetas */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
}

.badge-primary {
    background: var(--primary-blue);
    color: var(--white);
}

.badge-secondary {
    background: var(--medium-gray);
    color: var(--white);
}

.badge-success {
    background: #16a34a;
    color: var(--white);
}

.badge-danger {
    background: #dc2626;
    color: var(--white);
}

.badge-warning {
    background: #d97706;
    color: var(--white);
}

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

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

/* Responsivo */
@media (max-width: 768px) {
    .container {
        padding: 0 0.5rem;
    }
    
    .col-sm-12 { flex: 0 0 100%; }
    .col-sm-6 { flex: 0 0 50%; }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}

@media (max-width: 480px) {
    .row {
        margin: 0;
    }
    
    .col {
        padding: 0;
        margin-bottom: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
}

/* Accesibilidad */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus visible para accesibilidad */
.btn:focus-visible,
.form-control:focus-visible {
    outline: 2px solid var(--secondary-blue);
    outline-offset: 2px;
}