@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ==========================================================================
   CSS Custom Properties (Variables)
   ========================================================================== */
:root {
    /* Primary Colors */
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-primary-light: #e0e7ff;
    --color-primary-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
    
    /* Semantic Colors */
    --color-secondary: #0ea5e9;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #06b6d4;
    
    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    
    /* Surface Colors */
    --color-surface: #ffffff;
    --color-surface-hover: #f8fafc;
    
    /* Border Colors */
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    
    /* Text Colors */
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-tertiary: #94a3b8;
    --color-text-inverse: #ffffff;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-xs: clamp(0.75rem, 0.7vw + 0.5rem, 0.875rem);
    --font-size-sm: clamp(0.875rem, 0.8vw + 0.5rem, 1rem);
    --font-size-base: clamp(1rem, 1vw + 0.5rem, 1.125rem);
    --font-size-lg: clamp(1.125rem, 1.2vw + 0.5rem, 1.25rem);
    --font-size-xl: clamp(1.25rem, 1.5vw + 0.5rem, 1.5rem);
    --font-size-2xl: clamp(1.5rem, 2vw + 0.5rem, 1.875rem);
    --font-size-3xl: clamp(1.875rem, 2.5vw + 0.5rem, 2.25rem);
    --font-size-4xl: clamp(2.25rem, 3vw + 0.5rem, 3rem);
    
    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing Scale (4px base) */
    --spacing-1: 0.25rem;  /* 4px */
    --spacing-2: 0.5rem;   /* 8px */
    --spacing-3: 0.75rem;  /* 12px */
    --spacing-4: 1rem;     /* 16px */
    --spacing-5: 1.25rem;  /* 20px */
    --spacing-6: 1.5rem;   /* 24px */
    --spacing-8: 2rem;     /* 32px */
    --spacing-10: 2.5rem;  /* 40px */
    --spacing-12: 3rem;    /* 48px */
    --spacing-16: 4rem;    /* 64px */
    --spacing-20: 5rem;    /* 80px */
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Z-Index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-modal: 1050;
    --z-toast: 1090;
}

/* Light Theme explicitly */
[data-theme="light"] {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-surface: #ffffff;
    --color-surface-hover: #f8fafc;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-tertiary: #94a3b8;
    --color-text-inverse: #ffffff;
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
}

/* Dark Theme overrides */
[data-theme="dark"] {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    
    --color-surface: #1e293b;
    --color-surface-hover: #334155;
    
    --color-border: #334155;
    --color-border-light: #1e293b;
    
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-tertiary: #94a3b8;
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.5), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   Base Styles
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

::selection {
    background-color: var(--color-primary);
    color: white;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    line-height: 1.2;
    margin-bottom: var(--spacing-4);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-4);
    color: var(--color-text-secondary);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

img, video {
    max-width: 100%;
    height: auto;
    display: block;
}

button, input, optgroup, select, textarea {
    font-family: inherit;
    font-size: 100%;
    line-height: 1.15;
    margin: 0;
}

button, [type="button"], [type="reset"], [type="submit"] {
    -webkit-appearance: button;
}

/* ==========================================================================
   Components
   ========================================================================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-base);
    text-align: center;
    user-select: none;
    white-space: nowrap;
}

.btn:disabled, .btn.loading {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Button Variants */
.btn-primary {
    background: var(--color-primary);
    color: white;
}
.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
}

.btn-secondary {
    background: var(--color-secondary);
    color: white;
}
.btn-secondary:hover:not(:disabled) {
    background: #0284c7; /* darker secondary */
}

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

.btn-outline {
    background: transparent;
    border-color: var(--color-border);
    color: var(--color-text-primary);
}
.btn-outline:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-light);
}
[data-theme="dark"] .btn-outline:hover:not(:disabled) {
    background: rgba(99, 102, 241, 0.1);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-primary);
}
.btn-ghost:hover:not(:disabled) {
    background: var(--color-bg-tertiary);
}

/* Button Sizes */
.btn-sm {
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
}
.btn-lg {
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-lg);
}

.btn-icon {
    padding: var(--spacing-2);
    width: 2.5rem;
    height: 2.5rem;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    border-radius: var(--radius-md);
}
.btn-icon.btn-sm { width: 2rem; height: 2rem; padding: var(--spacing-1); }
.btn-icon.btn-lg { width: 3rem; height: 3rem; padding: var(--spacing-3); }

/* Loading Spinner for buttons */
.spinner {
    width: 1em;
    height: 1em;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
}

/* Cards */
.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.card-header {
    padding: var(--spacing-4) var(--spacing-5);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-body {
    padding: var(--spacing-5);
}

.card-footer {
    padding: var(--spacing-4) var(--spacing-5);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg-secondary);
}

.card-stat {
    padding: var(--spacing-6);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}
.card-stat .stat-title {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}
.card-stat .stat-value {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-4);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-2);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-text-primary);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}
[data-theme="dark"] .form-input:focus, [data-theme="dark"] .form-select:focus, [data-theme="dark"] .form-textarea:focus {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-input:disabled, .form-select:disabled, .form-textarea:disabled {
    background-color: var(--color-bg-secondary);
    cursor: not-allowed;
    opacity: 0.7;
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-checkbox {
    width: 1rem;
    height: 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    accent-color: var(--color-primary);
}

.input-group {
    display: flex;
    align-items: stretch;
}
.input-group .form-input {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}
.input-group .btn, .input-group .input-group-text {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    margin-left: -1px;
}
.input-group-text {
    display: flex;
    align-items: center;
    padding: var(--spacing-2) var(--spacing-3);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.form-helper {
    margin-top: var(--spacing-1);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.form-error-text {
    margin-top: var(--spacing-1);
    font-size: var(--font-size-sm);
    color: var(--color-danger);
    display: none;
}

.form-input.error {
    border-color: var(--color-danger);
}
.form-input.error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}
.form-input.error ~ .form-error-text {
    display: block;
}

/* Tables */
.table-container {
    width: 100%;
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    background-color: var(--color-surface);
}

.table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.table th, .table td {
    padding: var(--spacing-3) var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
}

.table th {
    background-color: var(--color-bg-secondary);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.table tbody tr:last-child td {
    border-bottom: none;
}

.table-responsive {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.625rem;
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge-primary { background-color: var(--color-primary-light); color: var(--color-primary); }
.badge-success { background-color: rgba(16, 185, 129, 0.1); color: var(--color-success); }
.badge-warning { background-color: rgba(245, 158, 11, 0.1); color: var(--color-warning); }
.badge-danger { background-color: rgba(239, 68, 68, 0.1); color: var(--color-danger); }
.badge-neutral { background-color: var(--color-bg-tertiary); color: var(--color-text-secondary); }

.badge-sm { padding: 0.125rem 0.375rem; font-size: 0.625rem; }
.badge-lg { padding: 0.25rem 0.75rem; font-size: 0.875rem; }

.badge-dot::before {
    content: '';
    width: 0.375rem;
    height: 0.375rem;
    border-radius: 50%;
    margin-right: 0.375rem;
    display: inline-block;
    background-color: currentColor;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-modal);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-container {
    position: relative;
    background-color: var(--color-surface);
    width: 100%;
    max-width: 32rem; /* 512px */
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 1;
    transform: scale(0.95);
    transition: transform var(--transition-base);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal.active .modal-container {
    transform: scale(1);
}

.modal-header {
    padding: var(--spacing-4) var(--spacing-5);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-title { margin-bottom: 0; }

.modal-close {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--spacing-1);
    border-radius: var(--radius-sm);
}
.modal-close:hover { background-color: var(--color-bg-secondary); }

.modal-body {
    padding: var(--spacing-5);
    overflow-y: auto;
}

.modal-footer {
    padding: var(--spacing-4) var(--spacing-5);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-3);
    background-color: var(--color-bg-secondary);
    border-bottom-left-radius: var(--radius-lg);
    border-bottom-right-radius: var(--radius-lg);
}

/* Toasts */
.toast-container {
    position: fixed;
    bottom: var(--spacing-6);
    right: var(--spacing-6);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    max-width: 24rem;
}

.toast {
    position: relative;
    display: flex;
    align-items: flex-start;
    padding: var(--spacing-4);
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--color-info);
    overflow: hidden;
}

.toast-success { border-left-color: var(--color-success); }
.toast-error { border-left-color: var(--color-danger); }
.toast-warning { border-left-color: var(--color-warning); }

.toast-icon {
    margin-right: var(--spacing-3);
    flex-shrink: 0;
}
.toast-success .toast-icon { color: var(--color-success); }
.toast-error .toast-icon { color: var(--color-danger); }
.toast-warning .toast-icon { color: var(--color-warning); }
.toast-info .toast-icon { color: var(--color-info); }

.toast-content {
    flex-grow: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    padding-right: var(--spacing-6);
}

.toast-close {
    position: absolute;
    top: var(--spacing-2);
    right: var(--spacing-2);
    background: transparent;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
}

.toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background-color: currentColor;
    opacity: 0.3;
    animation: progressBar linear forwards;
}

@keyframes progressBar {
    0% { width: 100%; }
    100% { width: 0%; }
}

/* Dropdown */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--spacing-2);
    min-width: 12rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-dropdown);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
}

.dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: var(--spacing-2) var(--spacing-4);
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: background-color var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--color-bg-secondary);
}

/* Skeleton Loader */
.skeleton {
    background: linear-gradient(90deg, var(--color-bg-secondary) 25%, var(--color-bg-tertiary) 50%, var(--color-bg-secondary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text { height: 1rem; margin-bottom: 0.5rem; width: 100%; }
.skeleton-circle { width: 3rem; height: 3rem; border-radius: 50%; }
.skeleton-card { height: 200px; }

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-10) var(--spacing-5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.empty-state-icon {
    font-size: 3rem;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-4);
}
.empty-state-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-2);
}
.empty-state-desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-6);
    max-width: 24rem;
}

/* Alerts */
.alert {
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-4);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    border: 1px solid transparent;
}
.alert-icon { flex-shrink: 0; }

.alert-info { background-color: rgba(6, 182, 212, 0.1); border-color: rgba(6, 182, 212, 0.2); color: #0891b2; }
.alert-success { background-color: rgba(16, 185, 129, 0.1); border-color: rgba(16, 185, 129, 0.2); color: #059669; }
.alert-warning { background-color: rgba(245, 158, 11, 0.1); border-color: rgba(245, 158, 11, 0.2); color: #d97706; }
.alert-danger { background-color: rgba(239, 68, 68, 0.1); border-color: rgba(239, 68, 68, 0.2); color: #dc2626; }
[data-theme="dark"] .alert-info { color: #22d3ee; }
[data-theme="dark"] .alert-success { color: #34d399; }
[data-theme="dark"] .alert-warning { color: #fbbf24; }
[data-theme="dark"] .alert-danger { color: #f87171; }

/* Tabs */
.tabs { margin-bottom: var(--spacing-4); }
.tab-list {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    gap: var(--spacing-6);
    overflow-x: auto;
}
.tab-item {
    padding: var(--spacing-3) 0;
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.tab-item:hover { color: var(--color-text-primary); }
.tab-item.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-1);
    list-style: none;
    margin-top: var(--spacing-6);
}
.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    background-color: var(--color-surface);
}
.page-link:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
}
.page-item.active .page-link {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}
.page-item.disabled .page-link {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--color-bg-secondary);
}

/* Avatar */
.avatar {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    overflow: hidden;
}
.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.avatar-sm { width: 2rem; height: 2rem; font-size: 0.875rem; }
.avatar-md { width: 2.5rem; height: 2.5rem; font-size: 1rem; }
.avatar-lg { width: 3rem; height: 3rem; font-size: 1.25rem; }
.avatar-xl { width: 4rem; height: 4rem; font-size: 1.5rem; }

.avatar-group { display: flex; align-items: center; }
.avatar-group .avatar {
    border: 2px solid var(--color-surface);
    margin-left: -0.75rem;
}
.avatar-group .avatar:first-child { margin-left: 0; }

/* Tooltip (CSS only) */
[data-tooltip] {
    position: relative;
    cursor: pointer;
}
[data-tooltip]::before,
[data-tooltip]::after {
    position: absolute;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    z-index: var(--z-tooltip, 1060);
    pointer-events: none;
}
[data-tooltip]::before {
    content: attr(data-tooltip);
    background-color: var(--color-text-primary);
    color: var(--color-bg-primary);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    white-space: nowrap;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
}
[data-tooltip]::after {
    content: '';
    border: 5px solid transparent;
    border-top-color: var(--color-text-primary);
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(6px);
}
[data-tooltip]:hover::before,
[data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
}


/* ==========================================================================
   Utility Classes
   ========================================================================== */

/* Typography Utils */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }

.font-bold { font-weight: var(--font-weight-bold); }
.font-medium { font-weight: var(--font-weight-medium); }
.text-sm { font-size: var(--font-size-sm); }
.text-lg { font-size: var(--font-size-lg); }

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Backgrounds */
.bg-primary { background-color: var(--color-primary); color: white; }
.bg-secondary { background-color: var(--color-bg-secondary); }
.bg-success { background-color: var(--color-success); color: white; }
.bg-danger { background-color: var(--color-danger); color: white; }
.bg-surface { background-color: var(--color-surface); }

/* Flex & Grid */
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }

.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* Gaps */
.gap-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }
.gap-5 { gap: var(--spacing-5); }
.gap-6 { gap: var(--spacing-6); }
.gap-8 { gap: var(--spacing-8); }

/* Margins & Paddings */
.m-0 { margin: 0; }
.mt-1 { margin-top: var(--spacing-1); } .mb-1 { margin-bottom: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); } .mb-2 { margin-bottom: var(--spacing-2); }
.mt-3 { margin-top: var(--spacing-3); } .mb-3 { margin-bottom: var(--spacing-3); }
.mt-4 { margin-top: var(--spacing-4); } .mb-4 { margin-bottom: var(--spacing-4); }
.mt-5 { margin-top: var(--spacing-5); } .mb-5 { margin-bottom: var(--spacing-5); }
.mt-6 { margin-top: var(--spacing-6); } .mb-6 { margin-bottom: var(--spacing-6); }
.mt-8 { margin-top: var(--spacing-8); } .mb-8 { margin-bottom: var(--spacing-8); }
.mx-auto { margin-left: auto; margin-right: auto; }
.my-4 { margin-top: var(--spacing-4); margin-bottom: var(--spacing-4); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-1); }
.p-2 { padding: var(--spacing-2); }
.p-3 { padding: var(--spacing-3); }
.p-4 { padding: var(--spacing-4); }
.p-5 { padding: var(--spacing-5); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }
.px-4 { padding-left: var(--spacing-4); padding-right: var(--spacing-4); }
.py-4 { padding-top: var(--spacing-4); padding-bottom: var(--spacing-4); }

/* Sizing */
.w-full { width: 100%; }
.h-full { height: 100%; }
.max-w-md { max-width: 28rem; }
.max-w-lg { max-width: 32rem; }
.max-w-xl { max-width: 36rem; }

/* Display */
.hidden { display: none !important; }
.block { display: block; }
.inline-block { display: inline-block; }
.invisible { visibility: hidden; }

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Container */
.container {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-4);
    padding-right: var(--spacing-4);
    max-width: 1280px;
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; } }
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes slideDown { from { transform: translateY(-20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes slideInRight { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes scaleIn { from { transform: scale(0.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .5; } }
@keyframes bounce { 0%, 100% { transform: translateY(-25%); animation-timing-function: cubic-bezier(0.8,0,1,1); } 50% { transform: none; animation-timing-function: cubic-bezier(0,0,0.2,1); } }

.animate-fade-in { animation: fadeIn 0.3s ease-out forwards; }
.animate-slide-up { animation: slideUp 0.4s ease-out forwards; }
.animate-slide-in-right { animation: slideInRight 0.3s ease-out forwards; }
.animate-scale-in { animation: scaleIn 0.3s ease-out forwards; }
.animate-pulse { animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }

.animate-delay-100 { animation-delay: 100ms; }
.animate-delay-200 { animation-delay: 200ms; }
.animate-delay-300 { animation-delay: 300ms; }

/* Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* sm: 640px and up */
@media (min-width: 640px) {
    .container { padding-left: var(--spacing-6); padding-right: var(--spacing-6); }
    .sm\:grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .sm\:flex-row { flex-direction: row; }
}

/* md: 768px and up */
@media (min-width: 768px) {
    .container { padding-left: var(--spacing-8); padding-right: var(--spacing-8); }
    .md\:grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .hidden-desktop { display: none !important; }
}

/* lg: 1024px and up */
@media (min-width: 1024px) {
    .lg\:grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* xl: 1280px and up */
@media (min-width: 1280px) {
    .xl\:grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* Max-width media queries for hiding */
@media (max-width: 767px) {
    .hidden-mobile { display: none !important; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .hidden-tablet { display: none !important; }
}

/* ==========================================================================
   Navbar Component Styles
   ========================================================================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(8px);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.5rem;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-decoration: none;
}

.navbar-logo span {
    background: var(--color-primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-6);
}

.navbar-item {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.navbar-item:hover {
    color: var(--color-primary);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.navbar-mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    padding: var(--spacing-2);
}

@media (max-width: 768px) {
    .navbar-menu {
        display: none;
    }
    .navbar-mobile-toggle {
        display: block;
    }
}

/* Theme Toggle Icons */
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }