/* Modern UI Theme */
:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --secondary: #0ea5e9;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1f2937;
    --gray: #6b7280;
    --light: #f3f4f6;
    --white: #ffffff;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
}

/* Global Styles */
body {
    font-family: 'Inter', sans-serif;
    background-color: #f9fafb;
    color: var(--dark);
    line-height: 1.6;
}

/* Header/Navigation */
.navbar {
    background: linear-gradient(to right, var(--primary), var(--primary-dark));
    padding: 1rem 0;
    box-shadow: var(--shadow-md);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--white) !important;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

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

/* Cards */
.card {
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background: var(--white);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    background: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 1.5rem;
}

.card-body {
    padding: 1.5rem;
}

/* Forms */
.form-control, .form-select {
    border: 2px solid #e5e7eb;
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

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

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(to right, var(--primary), var(--primary-dark));
    border: none;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(to right, var(--primary-dark), var(--primary));
}

.btn-outline-primary {
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

/* Stats Cards */
.stat-card {
    position: relative;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--white) 0%, #f3f4f6 100%);
    overflow: hidden;
}

.stat-icon {
    position: absolute;
    right: -10px;
    top: -10px;
    font-size: 5rem;
    opacity: 0.1;
    transform: rotate(15deg);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--gray);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Leave Items */
.leave-item {
    padding: 1rem;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary);
    background: var(--white);
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.leave-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

/* Status Badges */
.badge {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.status-approved {
    background-color: #dcfce7;
    color: #166534;
}

.status-pending {
    background-color: #fef3c7;
    color: #92400e;
}

.status-rejected {
    background-color: #fee2e2;
    color: #991b1b;
}

/* Utilities */
.text-primary { color: var(--primary) !important; }
.text-success { color: var(--success) !important; }
.text-warning { color: var(--warning) !important; }
.text-danger { color: var(--danger) !important; }
.text-dark { color: var(--dark) !important; }
.text-gray { color: var(--gray) !important; }

/* Responsive Design */
@media (max-width: 768px) {
    .card {
        margin-bottom: 1rem;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .stat-value {
        font-size: 2rem;
    }
}

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

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

/* Loading States */
.loading {
    position: relative;
    opacity: 0.7;
}

.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 1.5rem;
    height: 1.5rem;
    border: 3px solid var(--light);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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