/* Global Styles */
:root {
    /* Color Scheme */
    --primary-color: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --light-color: #f8fafc;
    --dark-color: #1e293b;
    --surface-color: white;
    --border-color: #e2e8f0;
    
    /* Gradients */
    --primary-gradient: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    --surface-gradient: linear-gradient(135deg, var(--light-color), #f1f5f9);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Animation Durations */
    --animation-fast: 150ms;
    --animation-normal: 300ms;
    --animation-slow: 500ms;
    
    /* Z-index Layers */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-modal: 1030;
    --z-toast: 1040;
    --z-loading: 1050;
    
    /* Border Radius */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Animation Durations */
    --animation-fast: 150ms;
    --animation-normal: 300ms;
    --animation-slow: 500ms;
    
    /* Z-index Layers */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-modal: 1030;
    --z-toast: 1040;
    --z-loading: 1050;
}

/* Base Styles */
html {
    font-size: 16px;
    height: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--dark-color);
    background-color: var(--light-color);
    line-height: 1.5;
    min-height: 100%;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
}

.page-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.page-title i {
    color: var(--primary-color);
}

/* Navigation */
.navbar {
    background-color: var(--surface-color) !important;
    box-shadow: var(--shadow-sm) !important;
    height: 76px;
}

.navbar-brand {
    font-weight: 600;
}

.nav-link {
    font-weight: 500;
    color: var(--dark-color) !important;
    transition: all var(--transition-fast);
    border-radius: var(--border-radius-sm);
    padding: 0.5rem 1rem !important;
    display: flex !important;
    align-items: center;
    gap: 0.5rem;
}

/* Always visible dropdown arrow */
.navbar .dropdown-toggle::after {
    display: inline-block !important;
    margin-left: 0.5em !important;
    vertical-align: 0.15em !important;
    content: "" !important;
    border-top: 0.4em solid !important;
    border-right: 0.4em solid transparent !important;
    border-left: 0.4em solid transparent !important;
    border-bottom: 0 !important;
    opacity: 1 !important;
    visibility: visible !important;
    transition: transform 0.2s ease-in-out !important;
}

.navbar .dropdown-toggle[aria-expanded="true"]::after {
    transform: rotate(180deg) !important;
}

/* Override any Bootstrap hiding */
.navbar .dropdown-toggle::after {
    display: inline-block !important;
}

.navbar .dropdown-toggle:not(:hover)::after {
    display: inline-block !important;
}

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

.dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-sm);
    min-width: 220px;
}

.dropdown-item {
    font-weight: 500;
    padding: 0.625rem 1rem;
    transition: all var(--transition-fast);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.dropdown-item:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
    transform: translateX(4px);
}

.dropdown-divider {
    margin: var(--spacing-sm) 0;
    border-color: var(--border-color);
}

/* Cards */
.card {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    background-color: var(--surface-color);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

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

.card-header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-header i {
    color: var(--primary-color);
}

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

/* Forms */
.form-control {
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    transition: all var(--transition-fast);
    font-size: 0.9375rem;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

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

.form-text {
    color: var(--secondary-color);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

/* Buttons */
.btn {
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9375rem;
}

.btn i {
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary-gradient);
    border: none;
    color: white;
}

.btn-primary:hover,
.btn-primary:focus {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline-primary {
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

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

.btn-link {
    color: var(--primary-color);
    text-decoration: none;
    padding: 0;
}

.btn-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Tables */
.table-container {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.table {
    margin-bottom: 0;
}

.table thead th {
    background-color: var(--light-color);
    font-weight: 600;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

.table tbody td {
    padding: var(--spacing-md) var(--spacing-lg);
    vertical-align: middle;
}

.table tbody tr {
    transition: all var(--transition-fast);
}

.table tbody tr:hover {
    background-color: var(--light-color);
}

/* Alerts */
.alert {
    border: none;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.alert i {
    margin-top: 0.125rem;
}

.alert-success {
    background-color: #dcfce7;
    color: #166534;
}

.alert-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
}

/* Footer */
.footer {
    background-color: var(--surface-color);
    padding: var(--spacing-lg) 0;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

.footer a {
    color: var(--secondary-color);
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: var(--primary-color);
}

/* Utilities */
.shadow-hover {
    transition: all var(--transition-normal);
}

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

/* Loading States */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: "";
    position: absolute;
    inset: 0;
    background-color: rgba(255, 255, 255, 0.7);
    border-radius: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Enhanced Loading States */
.loading-container {
    position: relative;
    min-height: 200px;
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1050;
    backdrop-filter: blur(4px);
    border-radius: 0.75rem;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Interactive Elements */
.hover-card {
    transition: all var(--transition-normal);
    cursor: pointer;
}

.hover-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.hover-card:active {
    transform: translateY(-2px);
}

.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, rgba(255, 255, 255, 0.3) 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10, 10);
    opacity: 0;
    transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.ripple:active::after {
    transform: scale(0, 0);
    opacity: 0.3;
    transition: 0s;
}

/* Enhanced Accessibility */
:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 1040;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: white;
    border-radius: 0.5rem;
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    min-width: 300px;
    max-width: 400px;
    animation: slideIn 300ms ease-out;
}

.toast.success { border-left: 4px solid #22c55e; }
.toast.error { border-left: 4px solid #ef4444; }
.toast.warning { border-left: 4px solid #f59e0b; }
.toast.info { border-left: 4px solid #3b82f6; }

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

/* Enhanced Mobile Responsiveness */
@media (max-width: 767.98px) {
    .toast-container {
        left: 0.5rem;
        right: 0.5rem;
        bottom: 0.5rem;
    }
    
    .toast {
        min-width: auto;
        width: 100%;
    }
    
    .loading-container {
        min-height: 150px;
    }
}

/* Smooth Scrolling */
.smooth-scroll {
    scroll-behavior: smooth;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* Enhanced Transitions */
.fade-enter {
    opacity: 0;
    transform: translateY(10px);
}

.fade-enter-active {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 300ms, transform 300ms;
}

.fade-exit {
    opacity: 1;
    transform: translateY(0);
}

.fade-exit-active {
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 300ms, transform 300ms;
}

/* Responsive Design */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background-color: var(--surface-color);
        padding: var(--spacing-md);
        border-radius: var(--border-radius-lg);
        box-shadow: var(--shadow-lg);
        position: absolute;
        top: 100%;
        left: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    .navbar-nav {
        padding: var(--spacing-sm) 0;
    }
    
    .dropdown-menu {
        box-shadow: none;
        padding: 0;
        margin: var(--spacing-sm) 0;
        background-color: var(--light-color);
    }
}

@media (max-width: 767.98px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }
    
    .page-title {
        font-size: 1.5rem;
    }
    
    .card-body {
        padding: var(--spacing-md);
    }
    
    .table-responsive {
        margin: 0 calc(-1 * var(--spacing-md));
        width: calc(100% + (2 * var(--spacing-md)));
    }
    
    .btn {
        padding: 0.625rem 1.25rem;
    }
    
    .toast-container {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        bottom: var(--spacing-sm);
    }
    
    .toast {
        min-width: auto;
        width: 100%;
    }
    
    .loading-container {
        min-height: 150px;
    }
}

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

.fade-in {
    animation: fadeIn var(--transition-normal) ease-out forwards;
}

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

::-webkit-scrollbar-track {
    background-color: var(--light-color);
}

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

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

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

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-lg);
}

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

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

/* Badge */
.badge {
    font-weight: 500;
    padding: 0.35em 0.65em;
    border-radius: var(--border-radius-sm);
}

/* Pagination */
.pagination {
    margin-bottom: 0;
}

.page-link {
    border: none;
    padding: 0.75rem 1rem;
    margin: 0 2px;
    border-radius: var(--border-radius-sm) !important;
    color: var(--dark-color);
    transition: all var(--transition-fast);
}

.page-link:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

.page-item.active .page-link {
    background: var(--primary-gradient);
    color: white;
}