:root {
    --primary-color: #1e3a8a;
    --secondary-color: #0f172a;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --sidebar-width: 280px;
}

body {
    background-color: #f8fafc;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    overflow-x: hidden;
}

.container-fluid {
    padding: 20px;
}

/* Navbar mejorado */
.navbar {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* Menú horizontal */
.navbar-nav {
    margin-left: auto;
}

.navbar-nav .nav-item {
    margin: 0 5px;
}

.navbar-nav .nav-link {
    padding: 10px 15px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.navbar-nav .nav-link.active {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
}

/* Tarjetas con efecto hover */
.card {
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
    border: none;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.card-header {
    border-radius: 12px 12px 0 0 !important;
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: 1rem 1.5rem;
}

/* Alertas personalizadas */
.alert {
    border-radius: 8px;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-color: #c3e6cb;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}

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

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-color: #bee5eb;
}

/* Botones con estilos personalizados */
.btn {
    border-radius: 8px;
    padding: 8px 16px;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: #1d3578;
    border-color: #1d3578;
}

.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.btn-success:hover {
    background-color: #0da271;
    border-color: #0da271;
}

.btn-danger {
    background-color: var(--danger-color);
    border-color: var(--danger-color);
}

.btn-danger:hover {
    background-color: #e02424;
    border-color: #e02424;
}

.btn-warning {
    background-color: var(--warning-color);
    border-color: var(--warning-color);
    color: white;
}

.btn-warning:hover {
    background-color: #e08900;
    border-color: #e08900;
    color: white;
}

.btn-info {
    background-color: #3b82f6;
    border-color: #3b82f6;
}

.btn-info:hover {
    background-color: #2563eb;
    border-color: #2563eb;
}

/* Formularios mejorados */
.form-control, .form-select {
    border-radius: 8px;
    padding: 10px 15px;
    transition: all 0.2s;
    border: 1px solid #cbd5e1;
}

.form-control:focus, .form-select:focus {
    box-shadow: 0 0 0 0.2rem rgba(30, 58, 138, 0.25);
    border-color: var(--primary-color);
}

.form-label {
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.form-text {
    font-size: 0.85rem;
    color: #64748b;
}

/* Drop zone para subir archivos */
.drop-zone {
    border: 2px dashed #cbd5e1;
    border-radius: 8px;
    padding: 25px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: #f8fafc;
    min-height: 170px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.drop-zone:hover {
    border-color: #3b82f6;
    background-color: #bfdbfe;
}

.drop-zone.dragover {
    border-color: var(--primary-color);
    background-color: #93c5fd;
}

#previewContainer img {
    max-width: 100%;
    max-height: 130px;
    border-radius: 4px;
    margin-top: 10px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* Tablas mejoradas */
.table {
    border-radius: 8px;
    overflow: hidden;
}

.table th {
    background-color: #f1f5f9;
    font-weight: 600;
}

.table-hover tbody tr:hover {
    background-color: #f8fafc;
}

/* Gráficos y reportes */
.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
}

/* Diagnóstico del sistema */
.diagnostic-card {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    color: white;
    border: none;
}

.diagnostic-row {
    padding: 15px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.diagnostic-row:last-child {
    border-bottom: none;
}

/* Footer responsivo */
.footer {
    background-color: var(--secondary-color);
    color: #cbd5e1;
    padding: 1.5rem 0;
    margin-top: 2rem;
}

/* Sidebar (para versiones futuras) */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--sidebar-width);
    background: linear-gradient(to bottom, var(--secondary-color), #1e293b);
    transition: all 0.3s;
    z-index: 100;
}

.sidebar .nav-link {
    color: #cbd5e1;
    padding: 12px 20px;
    font-weight: 500;
    border-radius: 8px;
    margin: 4px 10px;
    transition: all 0.2s;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.sidebar .nav-link i {
    width: 24px;
    text-align: center;
}

main {
    margin-left: var(--sidebar-width);
    transition: all 0.3s;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    main {
        margin-left: 0;
    }
    
    .navbar-toggler {
        display: block !important;
    }
    
    .drop-zone {
        min-height: 150px;
        padding: 20px 10px;
    }
}

/* Estilos para rankings */
.bi-brown {
    color: #8B4513;
}

.bg-brown {
    background-color: #8B4513 !important;
}

.bg-brown.bg-opacity-10 {
    background-color: rgba(139, 69, 19, 0.1) !important;
}

/* Estilos para ayuda */
.accordion-button {
    font-weight: 600;
    border: none;
    background-color: #f8fafc;
}

.accordion-button:not(.collapsed) {
    color: #0f172a;
    background-color: #f1f5f9;
}

.accordion-item {
    border-radius: 10px !important;
    margin-bottom: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.accordion-body {
    background-color: #f8fafc;
}

/* Efectos hover en rankings */
.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1) !important;
}

/* Responsive para móviles */
@media (max-width: 768px) {
    .navbar-nav {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-item {
        margin: 0 2px !important;
    }
    
    .nav-link {
        padding: 5px 8px !important;
        font-size: 0.85rem !important;
    }
    
    .card-header h4 {
        font-size: 1.1rem !important;
    }
    
    .drop-zone {
        min-height: 160px;
        padding: 20px;
    }
    
    #previewContainer img {
        max-height: 120px;
    }
    
    .btn-lg {
        font-size: 1rem !important;
        padding: 10px 15px !important;
    }
}

/* Estilos para la página de login */
.login-card {
    max-width: 450px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    overflow: hidden;
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), #0f172a);
    color: white;
    padding: 1.5rem;
}

.logo {
    font-size: 2.2rem;
    margin-right: 10px;
}

.input-group {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.input-group-text {
    background-color: #f1f5f9;
    border-right: none;
}

.btn {
    border-radius: 8px;
    transition: all 0.2s;
}

.btn-primary {
    background: linear-gradient(120deg, #1e3a8a, #0f172a);
    border: none;
    box-shadow: 0 4px 6px rgba(30, 58, 138, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 8px rgba(30, 58, 138, 0.4);
}