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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: calc(100vh - 100px);
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.header h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.header h1 i {
    color: #667eea;
    margin-right: 15px;
}

.subtitle {
    color: #7f8c8d;
    font-size: 1.1rem;
    font-weight: 300;
}

/* Navegación por pestañas */
.nav-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab-btn {
    background: rgba(255, 255, 255, 0.9);
    border: none;
    padding: 15px 25px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: #2c3e50;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.tab-btn:hover {
    background: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.tab-btn.active {
    background: #667eea;
    color: white;
}

.tab-btn i {
    margin-right: 8px;
}

/* Contenido de pestañas */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

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

/* Tarjetas */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.card h2 {
    color: #2c3e50;
    margin-bottom: 25px;
    font-size: 1.8rem;
    font-weight: 600;
}

.card h2 i {
    color: #667eea;
    margin-right: 10px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    flex-wrap: wrap;
}

/* Botones */
.btn {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a67d8;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
    transform: translateY(-2px);
}

.btn-success {
    background: #27ae60;
    color: white;
}

.btn-success:hover {
    background: #229954;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(39, 174, 96, 0.3);
}

/* Resultados */
.result-box {
    margin-top: 20px;
    padding: 20px;
    border-radius: 10px;
    border-left: 5px solid;
}

.result-box.success {
    background: #d4edda;
    border-color: #27ae60;
    color: #155724;
}

.result-box.error {
    background: #f8d7da;
    border-color: #e74c3c;
    color: #721c24;
}

.result-box.info {
    background: #cce7ff;
    border-color: #667eea;
    color: #004085;
}

/* Estadísticas */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-item {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.3);
}

.stat-item i {
    font-size: 2rem;
    margin-bottom: 10px;
    opacity: 0.8;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Tabla */
.table-container {
    margin-top: 20px;
    overflow-x: auto;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

#tabla-firmas {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

#tabla-firmas th,
#tabla-firmas td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #e1e8ed;
}

#tabla-firmas th {
    background: #f8f9fa;
    font-weight: 600;
    color: #2c3e50;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

#tabla-firmas tr:hover {
    background: #f8f9fa;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: white;
    border-radius: 15px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-header {
    padding: 25px 30px;
    border-bottom: 1px solid #e1e8ed;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    color: #2c3e50;
    font-size: 1.5rem;
    margin: 0;
}

.btn-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: #7f8c8d;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-close:hover {
    color: #e74c3c;
}

.modal-body {
    padding: 30px;
}

.modal-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 25px;
    flex-wrap: wrap;
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-spinner {
    background: white;
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.loading-spinner i {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 20px;
    display: block;
}

.loading-spinner p {
    color: #2c3e50;
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
}

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    border-radius: 15px 15px 0 0;
    color: #7f8c8d;
    font-size: 0.9rem;
}

.footer p {
    margin: 5px 0;
}

/* Alertas y notificaciones */
.alert {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border-left: 5px solid;
    font-weight: 500;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-color: #27ae60;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border-color: #e74c3c;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border-color: #ffc107;
}

.alert-info {
    background: #cce7ff;
    color: #004085;
    border-color: #667eea;
}

.alert i {
    margin-right: 10px;
}

/* Badges y etiquetas */
.badge {
    display: inline-block;
    padding: 4px 8px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 6px;
}

.badge-success {
    background: #27ae60;
    color: white;
}

.badge-error {
    background: #e74c3c;
    color: white;
}

.badge-info {
    background: #667eea;
    color: white;
}

.badge-warning {
    background: #f39c12;
    color: white;
}

/* Utilidades responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header {
        padding: 20px 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .nav-tabs {
        flex-direction: column;
        gap: 10px;
    }
    
    .tab-btn {
        width: 100%;
        text-align: center;
    }
    
    .card {
        padding: 20px 15px;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 20px;
        width: calc(100% - 40px);
    }
    
    .modal-header {
        padding: 20px 15px;
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .modal-body {
        padding: 20px 15px;
    }
    
    .modal-actions {
        justify-content: center;
    }
    
    .table-container {
        font-size: 0.9rem;
    }
    
    #tabla-firmas th,
    #tabla-firmas td {
        padding: 8px 10px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .loading-spinner {
        margin: 20px;
        padding: 30px 20px;
    }
    
    .loading-spinner i {
        font-size: 2.5rem;
    }
}

/* Animaciones adicionales */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.btn:active {
    animation: pulse 0.2s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.alert {
    animation: slideIn 0.3s ease;
}

/* Estados de carga para botones */
.btn.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn.loading i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Tooltips */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: #2c3e50;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-5px);
}

/* Estados de validación para inputs */
.form-group input.valid {
    border-color: #27ae60;
    box-shadow: 0 0 0 3px rgba(39, 174, 96, 0.1);
}

.form-group input.invalid {
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.form-group .error-message {
    color: #e74c3c;
    font-size: 0.85rem;
    margin-top: 5px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.form-group .success-message {
    color: #27ae60;
    font-size: 0.85rem;
    margin-top: 5px;
    display: flex;
    align-items: center;
    gap: 5px;
}

/* Scrollbar personalizado */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #5a67d8;
}

/* Efectos de enfoque mejorados */
.btn:focus,
input:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Mejoras de 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;
}

/* Estados de hover mejorados */
.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
}

/* Indicadores de estado */
.status-indicator {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 8px;
}

.status-indicator.online {
    background: #27ae60;
    box-shadow: 0 0 8px rgba(39, 174, 96, 0.4);
}

.status-indicator.offline {
    background: #e74c3c;
    box-shadow: 0 0 8px rgba(231, 76, 60, 0.4);
}

.status-indicator.pending {
    background: #f39c12;
    box-shadow: 0 0 8px rgba(243, 156, 18, 0.4);
    animation: pulse 2s infinite;
}