/* Global Styles */
:root {
    --primary-color: #1877f2;
    --secondary-color: #166fe5;
    --success-color: #42b72a;
    --danger-color: #e41e3f;
    --warning-color: #f7b928;
    --info-color: #54c7ec;
    --light-color: #f0f2f5;
    --dark-color: #1c1e21;
    --gray-color: #65676b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--light-color);
    color: var(--dark-color);
    line-height: 1.6;
}

/* Navbar Styles */
.navbar {
    background-color: var(--primary-color) !important;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.5rem;
}

.nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: rgba(255,255,255,0.9) !important;
}

.nav-link.active {
    color: #ffffff !important;
    font-weight: 600;
}

/* Card Styles */
.card {
    border: none;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.card-title {
    color: var(--dark-color);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

/* Form Styles */
.form-control, .form-select {
    border-radius: 6px;
    border: 1px solid #ddd;
    padding: 0.75rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(24,119,242,0.25);
}

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

.form-text {
    color: var(--gray-color);
    font-size: 0.875rem;
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    transform: translateY(-1px);
}

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

.btn-danger:hover {
    background-color: #d41b3a;
    border-color: #d41b3a;
}

/* Table Styles */
.table {
    margin-bottom: 0;
}

.table th {
    font-weight: 600;
    color: var(--dark-color);
    border-bottom: 2px solid #ddd;
}

.table td {
    vertical-align: middle;
}

/* Alert Styles */
.alert {
    border: none;
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.alert-success {
    background-color: #e7f3e5;
    color: var(--success-color);
}

.alert-danger {
    background-color: #fce8ec;
    color: var(--danger-color);
}

/* File Upload Styles */
input[type="file"] {
    padding: 0.5rem;
    background-color: #fff;
    border: 1px dashed #ddd;
    border-radius: 6px;
}

/* Statistics Card Styles */
.stats-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.stats-card h3 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.stats-card p {
    margin-bottom: 0;
    opacity: 0.9;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}