:root {
    /* Colors */
    --primary: #0D6EFD;
    --primary-light: #E7F1FF;
    --primary-dark: #0B5ED7;
    --secondary: #6C757D;
    --success: #198754;
    --info: #0DCAF0;
    --warning: #FFC107;
    --danger: #DC3545;
    --light: #F8F9FA;
    --dark: #212529;
    --gray: #6C757D;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 15px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition: all 0.3s ease;
    
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 6px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

/* Base Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f7fa;
    color: var(--dark);
    line-height: 1.5;
}

/* Layout */
.wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-header {
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-sidebar {
    width: 250px;
    background-color: white;
    box-shadow: var(--shadow-md);
    position: fixed;
    top: 56px;
    bottom: 0;
    left: 0;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.main-content {
    flex: 1;
    margin-left: 250px;
    padding: var(--spacing-lg);
    margin-top: 56px;
}

.main-footer {
    background-color: white;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    margin-top: auto;
}

/* Navigation */
.navbar {
    padding: var(--spacing-sm) var(--spacing-lg);
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
}

.nav-link {
    color: var(--dark);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    transition: var(--transition);
}

.nav-link:hover {
    background-color: var(--primary-light);
    color: var(--primary);
}

.nav-link.active {
    background-color: var(--primary);
    color: white;
}

/* Sidebar */
.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    border-radius: var(--border-radius-md);
}

.sidebar-nav .nav-link i {
    width: 20px;
    text-align: center;
    margin-right: var(--spacing-sm);
}

/* Cards */
.card {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.card-header {
    background-color: white;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.card-body {
    padding: var(--spacing-lg);
}

/* Buttons */
.btn {
    padding: 8px 16px;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn i {
    font-size: 0.875rem;
}

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

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

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

.btn-secondary:hover {
    background-color: #5C636A;
    border-color: #565E64;
    color: white;
}

/* Forms */
.form-control {
    border-radius: var(--border-radius-md);
    border: 1px solid #DEE2E6;
    padding: 8px 12px;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.form-label {
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--dark);
}

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

.table th {
    background-color: var(--light);
    color: var(--dark);
    font-weight: 600;
    padding: 12px;
    border-bottom: 2px solid #DEE2E6;
}

.table td {
    padding: 12px;
    vertical-align: middle;
    border-bottom: 1px solid #DEE2E6;
}

/* Badges */
.badge {
    padding: 4px 8px;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.75rem;
}

/* Alerts */
.alert {
    border-radius: var(--border-radius-md);
    padding: 12px 16px;
    margin-bottom: var(--spacing-md);
    border: none;
}

/* Modals */
.modal-content {
    border-radius: var(--border-radius-lg);
    border: none;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    padding: var(--spacing-md) var(--spacing-lg);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid #E9ECEF;
}

/* Responsive Design */
@media (max-width: 992px) {
    .main-sidebar {
        width: 0;
        transform: translateX(-100%);
        transition: var(--transition);
    }
    
    .main-sidebar.show {
        width: 250px;
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: var(--spacing-md);
    }
    
    .card-body {
        padding: var(--spacing-md);
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.3s ease-in-out;
}

/* Utility Classes */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.rounded-sm { border-radius: var(--border-radius-sm); }
.rounded-md { border-radius: var(--border-radius-md); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.rounded-xl { border-radius: var(--border-radius-xl); }

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    overflow-x: auto;
    padding-bottom: 28px;
}

.nav-container {
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 10px 0 5px 0;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: nowrap;
    min-width: max-content;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--gray);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
    margin: 0 8px;
    white-space: nowrap;
}

.nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--gray);
    background: none;
    border: none;
    font-size: 0.9rem;
    transition: var(--transition);
    cursor: pointer;
    margin: 0 8px;
    padding: 0;
    white-space: nowrap;
}

.nav-item i, .nav-btn i {
    font-size: 1.2rem;
    margin-bottom: 4px;
}

.nav-item.active, .nav-btn.active {
    color: var(--primary);
}

.nav-item:hover, .nav-btn:hover {
    color: var(--primary);
}

.nav-copyright {
    width: 100%;
    text-align: center;
    position: absolute;
    bottom: 0;
    left: 0;
    padding: 5px 0;
    font-size: 0.85rem;
    color: var(--gray);
    background-color: var(--light);
    border-top: 1px solid #ddd;
    line-height: 18px;
    box-shadow: 0 -1px 2px rgba(0,0,0,0.05);
    z-index: 1001;
}

.nav-copyright a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

/* Welcome Section */
.welcome-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--border-radius-lg);
    padding: clamp(1rem, 3vw, 1.5rem);
    color: white;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.welcome-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: clamp(0.75rem, 2vw, 1rem);
}

.user-info {
    display: flex;
    align-items: center;
    gap: clamp(1rem, 2.5vw, 1.5rem);
    flex: 1;
    min-width: 280px;
}

.profile-image {
    width: clamp(60px, 10vw, 80px);
    height: clamp(60px, 10vw, 80px);
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.3);
    overflow: hidden;
    background: rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
}

.profile-picture {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-details {
    flex: 1;
    min-width: 200px;
}

.user-details h2 {
    color: white;
    margin: 0 0 0.5rem 0;
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 600;
    line-height: 1.2;
}

.user-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: clamp(0.5rem, 1.5vw, 1rem);
}

.user-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    color: rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}

.user-meta i {
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    flex-shrink: 0;
}

.user-actions {
    display: flex;
    gap: clamp(0.5rem, 1.5vw, 0.75rem);
    margin-left: auto;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: clamp(0.4rem, 1vw, 0.5rem) clamp(0.75rem, 2vw, 1rem);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    transition: var(--transition);
    white-space: nowrap;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

/* Responsive Design for Bottom Nav and Welcome Section */
@media (max-width: 768px) {
    .nav-container {
        padding: 8px 0;
        justify-content: flex-start;
    }
    
    .nav-item, .nav-btn {
        font-size: 0.8rem;
    }
    
    .nav-item i, .nav-btn i {
        font-size: 1rem;
    }
    
    .nav-copyright {
        font-size: 0.75rem;
        padding: 4px 0;
    }

    .welcome-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 1.5rem;
    }

    .user-info {
        flex-direction: column;
        text-align: center;
        min-width: auto;
    }

    .user-details {
        min-width: auto;
    }

    .user-meta {
        justify-content: center;
    }

    .user-actions {
        width: 100%;
        justify-content: center;
        margin-left: 0;
    }
}

@media (max-width: 480px) {
    .welcome-card {
        border-radius: var(--border-radius-md);
    }

    .user-meta {
        flex-direction: column;
        gap: 0.5rem;
        width: 100%;
    }

    .user-meta span {
        width: 100%;
        justify-content: center;
    }

    .user-actions {
        flex-direction: column;
    }

    .action-btn {
        width: 100%;
        justify-content: center;
    }
}

@media (hover: none) {
    .action-btn:hover {
        transform: none;
    }
}