/**
 * AI Chat Interface - Modern Component Library
 * Professional, consistent, and reusable UI components
 */

:root {
    /* Primary Colors */
    --ai-primary: #667eea;
    --ai-primary-dark: #5a6fd8;
    --ai-primary-light: #7c8ef0;
    --ai-secondary: #764ba2;
    --ai-secondary-dark: #6a4190;
    --ai-secondary-light: #8255b4;
    
    /* Status Colors */
    --ai-success: #28a745;
    --ai-danger: #dc3545;
    --ai-warning: #ffc107;
    --ai-info: #17a2b8;
    
    /* Neutral Colors */
    --ai-light: #f8f9fa;
    --ai-dark: #343a40;
    --ai-muted: #6c757d;
    --ai-white: #ffffff;
    
    /* Gradients */
    --ai-gradient-primary: linear-gradient(135deg, var(--ai-primary) 0%, var(--ai-secondary) 100%);
    --ai-gradient-light: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    
    /* Shadows */
    --ai-shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --ai-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --ai-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    
    /* Border Radius */
    --ai-radius-sm: 0.25rem;
    --ai-radius: 0.5rem;
    --ai-radius-lg: 1rem;
    --ai-radius-xl: 1.5rem;
    
    /* Spacing */
    --ai-spacing-xs: 0.25rem;
    --ai-spacing-sm: 0.5rem;
    --ai-spacing: 1rem;
    --ai-spacing-lg: 1.5rem;
    --ai-spacing-xl: 3rem;
    
    /* Transitions */
    --ai-transition: all 0.3s ease;
    --ai-transition-fast: all 0.15s ease;
}

/* ==========================================================================
   CARD COMPONENTS
   ========================================================================== */

.ai-card {
    border: none;
    border-radius: var(--ai-radius-lg);
    box-shadow: var(--ai-shadow-sm);
    transition: var(--ai-transition);
    overflow: hidden;
}

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

.ai-card--primary {
    border-left: 4px solid var(--ai-primary);
}

.ai-card--success {
    border-left: 4px solid var(--ai-success);
}

.ai-card--warning {
    border-left: 4px solid var(--ai-warning);
}

.ai-card--danger {
    border-left: 4px solid var(--ai-danger);
}

.ai-card--info {
    border-left: 4px solid var(--ai-info);
}

.ai-card__header {
    background: var(--ai-gradient-light);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: var(--ai-spacing-lg);
}

.ai-card__icon {
    width: 40px;
    height: 40px;
    border-radius: var(--ai-radius);
    background: var(--ai-gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.ai-card__title {
    font-weight: 600;
    color: var(--ai-dark);
}

.ai-card__badge {
    font-size: 0.75rem;
    padding: 0.375rem 0.75rem;
    border-radius: var(--ai-radius);
}

.ai-card__body {
    padding: var(--ai-spacing-lg);
}

.ai-card__footer {
    background: var(--ai-light);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    padding: var(--ai-spacing);
}

.ai-card__actions {
    display: flex;
    gap: var(--ai-spacing-sm);
    flex-wrap: wrap;
}

/* Card Sizes */
.ai-card--sm .ai-card__header,
.ai-card--sm .ai-card__body,
.ai-card--sm .ai-card__footer {
    padding: var(--ai-spacing);
}

.ai-card--lg .ai-card__header,
.ai-card--lg .ai-card__body,
.ai-card--lg .ai-card__footer {
    padding: var(--ai-spacing-xl);
}

/* ==========================================================================
   BUTTON COMPONENTS
   ========================================================================== */

.ai-btn {
    border-radius: var(--ai-radius);
    font-weight: 500;
    transition: var(--ai-transition);
    border: none;
    position: relative;
    overflow: hidden;
}

.ai-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.ai-btn:hover::before {
    left: 100%;
}

.ai-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--ai-shadow);
}

.ai-btn:active {
    transform: translateY(0);
}

/* Button Variants */
.btn-primary.ai-btn {
    background: var(--ai-gradient-primary);
    border: none;
}

.btn-primary.ai-btn:hover {
    background: linear-gradient(135deg, var(--ai-primary-dark) 0%, var(--ai-secondary-dark) 100%);
}

/* ==========================================================================
   ALERT COMPONENTS
   ========================================================================== */

.ai-alert {
    border: none;
    border-radius: var(--ai-radius);
    border-left: 4px solid;
    padding: var(--ai-spacing-lg);
    margin-bottom: var(--ai-spacing);
}

.ai-alert__icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.ai-alert__title {
    font-weight: 600;
    margin-bottom: var(--ai-spacing-sm);
}

.ai-alert__message {
    line-height: 1.6;
}

/* Alert Variants */
.alert-success.ai-alert {
    background: rgba(40, 167, 69, 0.1);
    border-left-color: var(--ai-success);
    color: #155724;
}

.alert-danger.ai-alert {
    background: rgba(220, 53, 69, 0.1);
    border-left-color: var(--ai-danger);
    color: #721c24;
}

.alert-warning.ai-alert {
    background: rgba(255, 193, 7, 0.1);
    border-left-color: var(--ai-warning);
    color: #856404;
}

.alert-info.ai-alert {
    background: rgba(23, 162, 184, 0.1);
    border-left-color: var(--ai-info);
    color: #0c5460;
}

/* ==========================================================================
   EMPTY STATE COMPONENTS
   ========================================================================== */

.ai-empty-state {
    padding: var(--ai-spacing-xl);
}

.ai-empty-state__icon {
    width: 80px;
    height: 80px;
    margin: 0 auto;
    border-radius: 50%;
    background: var(--ai-gradient-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--ai-muted);
}

.ai-empty-state--sm .ai-empty-state__icon {
    width: 60px;
    height: 60px;
    font-size: 2rem;
}

.ai-empty-state--lg .ai-empty-state__icon {
    width: 100px;
    height: 100px;
    font-size: 3rem;
}

.ai-empty-state__title {
    font-weight: 600;
    color: var(--ai-dark);
}

.ai-empty-state__message {
    max-width: 400px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ==========================================================================
   LOADING COMPONENTS
   ========================================================================== */

.ai-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--ai-spacing-xl);
}

.ai-loading__spinner .spinner-border {
    width: 3rem;
    height: 3rem;
    border-width: 0.3em;
}

.ai-loading--sm .ai-loading__spinner .spinner-border {
    width: 1.5rem;
    height: 1.5rem;
    border-width: 0.2em;
}

.ai-loading--lg .ai-loading__spinner .spinner-border {
    width: 4rem;
    height: 4rem;
    border-width: 0.4em;
}

.ai-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(2px);
}

.ai-loading-overlay__content {
    background: white;
    padding: var(--ai-spacing-xl);
    border-radius: var(--ai-radius-lg);
    box-shadow: var(--ai-shadow-lg);
    text-align: center;
}

/* ==========================================================================
   UTILITY CLASSES
   ========================================================================== */

.ai-gradient-bg {
    background: var(--ai-gradient-primary);
}

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

.ai-shadow {
    box-shadow: var(--ai-shadow);
}

.ai-shadow-lg {
    box-shadow: var(--ai-shadow-lg);
}

.ai-rounded {
    border-radius: var(--ai-radius);
}

.ai-rounded-lg {
    border-radius: var(--ai-radius-lg);
}

.ai-transition {
    transition: var(--ai-transition);
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 768px) {
    .ai-card__actions {
        flex-direction: column;
    }
    
    .ai-card__actions .btn {
        width: 100%;
        margin-bottom: var(--ai-spacing-sm);
    }
    
    .ai-empty-state {
        padding: var(--ai-spacing-lg);
    }
    
    .ai-loading {
        padding: var(--ai-spacing-lg);
    }
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.ai-fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.ai-fade-in {
    animation: fadeIn 0.4s ease-out;
}

.ai-slide-in-right {
    animation: slideInRight 0.5s ease-out;
}

/* ==========================================================================
   PAGE HEADER COMPONENTS
   ========================================================================== */

.ai-page-header {
    background: var(--ai-gradient-light);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: var(--ai-spacing-xl) 0;
    margin-bottom: var(--ai-spacing-xl);
}

.ai-page-header__icon {
    width: 50px;
    height: 50px;
    border-radius: var(--ai-radius);
    background: var(--ai-gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.ai-page-header__title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--ai-dark);
    margin: 0;
}

.ai-page-header__subtitle {
    font-size: 1.1rem;
    margin: 0;
}

.ai-page-header__actions {
    display: flex;
    gap: var(--ai-spacing-sm);
    align-items: center;
}

.ai-breadcrumb {
    font-size: 0.9rem;
}

.ai-breadcrumb .breadcrumb-item a {
    color: var(--ai-muted);
    transition: var(--ai-transition);
}

.ai-breadcrumb .breadcrumb-item a:hover {
    color: var(--ai-primary);
}

/* ==========================================================================
   STATS CARD COMPONENTS
   ========================================================================== */

.ai-stats-card {
    background: white;
    border-radius: var(--ai-radius-lg);
    padding: var(--ai-spacing-lg);
    box-shadow: var(--ai-shadow-sm);
    transition: var(--ai-transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

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

.ai-stats-card__link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.ai-stats-card__link:hover {
    color: inherit;
}

.ai-stats-card__content {
    position: relative;
    z-index: 2;
}

.ai-stats-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--ai-spacing);
}

.ai-stats-card__icon {
    width: 50px;
    height: 50px;
    border-radius: var(--ai-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.ai-stats-card--primary .ai-stats-card__icon {
    background: var(--ai-gradient-primary);
}

.ai-stats-card--success .ai-stats-card__icon {
    background: linear-gradient(135deg, var(--ai-success) 0%, #20c997 100%);
}

.ai-stats-card--warning .ai-stats-card__icon {
    background: linear-gradient(135deg, var(--ai-warning) 0%, #fd7e14 100%);
}

.ai-stats-card--danger .ai-stats-card__icon {
    background: linear-gradient(135deg, var(--ai-danger) 0%, #e83e8c 100%);
}

.ai-stats-card--info .ai-stats-card__icon {
    background: linear-gradient(135deg, var(--ai-info) 0%, #6f42c1 100%);
}

.ai-stats-card__trend {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: var(--ai-radius-sm);
}

.ai-stats-card__trend--positive {
    color: var(--ai-success);
    background: rgba(40, 167, 69, 0.1);
}

.ai-stats-card__trend--negative {
    color: var(--ai-danger);
    background: rgba(220, 53, 69, 0.1);
}

.ai-stats-card__trend--neutral {
    color: var(--ai-muted);
    background: rgba(108, 117, 125, 0.1);
}

.ai-stats-card__value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--ai-dark);
    margin: 0 0 var(--ai-spacing-sm) 0;
    line-height: 1;
}

.ai-stats-card__title {
    color: var(--ai-muted);
    font-size: 0.9rem;
    font-weight: 500;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Stats Card Background Pattern */
.ai-stats-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(30px, -30px);
    z-index: 1;
}

/* ==========================================================================
   DARK MODE SUPPORT
   ========================================================================== */

@media (prefers-color-scheme: dark) {
    :root {
        --ai-light: #2d3748;
        --ai-dark: #f7fafc;
        --ai-muted: #a0aec0;
    }
    
    .ai-card {
        background: var(--ai-light);
        color: var(--ai-dark);
    }
    
    .ai-card__header {
        background: rgba(255, 255, 255, 0.05);
    }
    
    .ai-empty-state__icon {
        background: rgba(255, 255, 255, 0.1);
    }
}