/* Agent Chat V2 - Clean UI inspired by Microsoft AgentChat.Blazor */
/* Integrates with MudBlazor theme system */

/* ============================================
   CSS Variables - MudBlazor Integration
   ============================================ */
:root {
    /* Use MudBlazor palette when available, fallback to defaults */
    --chat-v2-primary: var(--mud-palette-primary, #0078d4);
    --chat-v2-primary-hover: var(--mud-palette-primary-darken, #106ebe);
    --chat-v2-background: var(--mud-palette-background, #f5f5f5);
    --chat-v2-surface: var(--mud-palette-surface, #ffffff);
    --chat-v2-text-primary: var(--mud-palette-text-primary, #323130);
    --chat-v2-text-secondary: var(--mud-palette-text-secondary, #605e5c);
    --chat-v2-border: var(--mud-palette-lines-default, #edebe9);
    
    /* Message colors */
    --chat-v2-user-bg: var(--mud-palette-primary, #0078d4);
    --chat-v2-user-text: #ffffff;
    --chat-v2-assistant-bg: var(--mud-palette-background-grey, #f3f2f1);
    --chat-v2-assistant-text: var(--mud-palette-text-primary, #323130);
    
    /* Status colors */
    --chat-v2-error: var(--mud-palette-error, #d13438);
    --chat-v2-success: var(--mud-palette-success, #107c10);
    --chat-v2-info: var(--mud-palette-info, #0078d4);
    --chat-v2-warning: var(--mud-palette-warning, #ffaa44);
    
    /* Spacing & sizing */
    --chat-v2-radius-sm: 4px;
    --chat-v2-radius-md: 8px;
    --chat-v2-radius-lg: 12px;
    --chat-v2-radius-xl: 16px;
    --chat-v2-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --chat-v2-shadow-md: 0 2px 8px rgba(0, 0, 0, 0.15);
    --chat-v2-message-max-width: 75%;
}

/* Dark theme overrides */
.mud-theme-dark {
    --chat-v2-user-bg: var(--mud-palette-primary-darken, #005a9e);
    --chat-v2-assistant-bg: var(--mud-palette-dark, #2d2d2d);
    --chat-v2-assistant-text: var(--mud-palette-text-primary, #e0e0e0);
}

/* ============================================
   Root Container (Desktop Layout)
   ============================================ */
.chat-v2-root {
    display: flex;
    height: 100%;
    background: var(--chat-v2-surface);
    border-radius: var(--chat-v2-radius-lg);
    box-shadow: var(--chat-v2-shadow-md);
    overflow: hidden;
}

/* ============================================
   Chat Window Container
   ============================================ */
.chat-v2-window {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--chat-v2-surface);
    border-radius: var(--chat-v2-radius-lg);
    box-shadow: var(--chat-v2-shadow-md);
    overflow: hidden;
}

.chat-v2-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--chat-v2-border);
    background: var(--chat-v2-surface);
    gap: 16px;
    flex-wrap: wrap;
}

.chat-v2-header-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--chat-v2-text-primary);
    margin: 0;
}

.chat-v2-header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.chat-v2-body {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.chat-v2-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--chat-v2-border);
    background: var(--chat-v2-surface);
}

/* ============================================
   Messages Container
   ============================================ */
.chat-v2-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    scroll-behavior: smooth;
}

/* Scrollbar styling */
.chat-v2-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-v2-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-v2-messages::-webkit-scrollbar-thumb {
    background: var(--chat-v2-border);
    border-radius: 4px;
}

.chat-v2-messages::-webkit-scrollbar-thumb:hover {
    background: var(--chat-v2-text-secondary);
}

/* ============================================
   Chat Messages
   ============================================ */
.chat-v2-message {
    max-width: var(--chat-v2-message-max-width);
    animation: chatV2FadeIn 0.3s ease;
}

@keyframes chatV2FadeIn {
    from { 
        opacity: 0; 
        transform: translateY(10px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

.chat-v2-message--user {
    align-self: flex-end;
}

.chat-v2-message--assistant {
    align-self: flex-start;
}

.chat-v2-message__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
    padding: 0 4px;
}

.chat-v2-message__role {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--chat-v2-text-secondary);
}

.chat-v2-message__time {
    font-size: 0.7rem;
    color: var(--chat-v2-text-secondary);
}

.chat-v2-message__content {
    padding: 12px 16px;
    border-radius: var(--chat-v2-radius-md);
    line-height: 1.6;
    word-wrap: break-word;
}

.chat-v2-message--user .chat-v2-message__content {
    background: var(--chat-v2-user-bg);
    color: var(--chat-v2-user-text);
    border-bottom-right-radius: var(--chat-v2-radius-sm);
}

.chat-v2-message--assistant .chat-v2-message__content {
    background: var(--chat-v2-assistant-bg);
    color: var(--chat-v2-assistant-text);
    border-bottom-left-radius: var(--chat-v2-radius-sm);
}

/* Message content styling */
.chat-v2-message__content code {
    background: rgba(0, 0, 0, 0.1);
    padding: 2px 6px;
    border-radius: var(--chat-v2-radius-sm);
    font-family: 'Cascadia Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.9em;
}

.chat-v2-message--user .chat-v2-message__content code {
    background: rgba(255, 255, 255, 0.2);
}

.chat-v2-message__content pre {
    background: rgba(0, 0, 0, 0.05);
    padding: 12px;
    border-radius: var(--chat-v2-radius-sm);
    overflow-x: auto;
    margin: 8px 0;
}

.chat-v2-message--user .chat-v2-message__content pre {
    background: rgba(255, 255, 255, 0.1);
}

.chat-v2-message__content pre code {
    background: none;
    padding: 0;
}

/* ============================================
   Message Metadata (WingletIS-specific)
   ============================================ */
.chat-v2-message__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    font-size: 0.72rem;
    color: var(--chat-v2-text-secondary);
}

.chat-v2-message--user .chat-v2-message__meta {
    border-top-color: rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.8);
}

.chat-v2-message__meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.chat-v2-message__meta-item svg,
.chat-v2-message__meta-item .mud-icon-root {
    font-size: 0.85rem;
}

.chat-v2-message__meta-separator {
    opacity: 0.5;
}

.chat-v2-message__meta-model {
    margin-left: auto;
    opacity: 0.7;
    font-style: italic;
}

/* ============================================
   Citations Panel (WingletIS-specific)
   ============================================ */
.chat-v2-citations {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.chat-v2-citations__header {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--chat-v2-text-secondary);
    cursor: pointer;
    user-select: none;
}

.chat-v2-citations__header:hover {
    color: var(--chat-v2-primary);
}

.chat-v2-citations__list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}

.chat-v2-citation-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: rgba(0, 120, 212, 0.1);
    color: var(--chat-v2-primary);
    border-radius: 12px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: background 0.2s;
}

.chat-v2-citation-chip:hover {
    background: rgba(0, 120, 212, 0.2);
}

/* ============================================
   Typing/Streaming Indicator
   ============================================ */
.chat-v2-typing {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--chat-v2-assistant-bg);
    border-radius: var(--chat-v2-radius-md);
    border-bottom-left-radius: var(--chat-v2-radius-sm);
}

.chat-v2-typing__dots {
    display: flex;
    gap: 4px;
}

.chat-v2-typing__dot {
    width: 8px;
    height: 8px;
    background: var(--chat-v2-text-secondary);
    border-radius: 50%;
    animation: chatV2Typing 1.4s infinite ease-in-out;
}

.chat-v2-typing__dot:nth-child(1) { animation-delay: 0s; }
.chat-v2-typing__dot:nth-child(2) { animation-delay: 0.2s; }
.chat-v2-typing__dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes chatV2Typing {
    0%, 60%, 100% { 
        transform: translateY(0); 
        opacity: 0.4; 
    }
    30% { 
        transform: translateY(-6px); 
        opacity: 1; 
    }
}

.chat-v2-typing__text {
    font-size: 0.85rem;
    color: var(--chat-v2-text-secondary);
}

/* Streaming message with blinking cursor */
.chat-v2-message--streaming .chat-v2-message__content::after {
    content: '▊';
    animation: chatV2Blink 1s infinite;
    margin-left: 2px;
}

@keyframes chatV2Blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* ============================================
   Message Input
   ============================================ */
.chat-v2-input-container {
    width: 100%;
}

.chat-v2-input-wrapper {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.chat-v2-textarea {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--chat-v2-border);
    border-radius: var(--chat-v2-radius-md);
    font-size: 14px;
    font-family: inherit;
    resize: none;
    min-height: 48px;
    max-height: 200px;
    line-height: 1.5;
    background: var(--chat-v2-surface);
    color: var(--chat-v2-text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
    overflow-y: auto;
}

.chat-v2-textarea:focus {
    outline: none;
    border-color: var(--chat-v2-primary);
    box-shadow: 0 0 0 2px rgba(0, 120, 212, 0.2);
}

.chat-v2-textarea:disabled {
    background: var(--chat-v2-background);
    cursor: not-allowed;
    opacity: 0.6;
}

.chat-v2-textarea::placeholder {
    color: var(--chat-v2-text-secondary);
}

.chat-v2-send-button {
    padding: 12px 20px;
    background: var(--chat-v2-primary);
    color: white;
    border: none;
    border-radius: var(--chat-v2-radius-md);
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    height: 48px;
}

.chat-v2-send-button:hover:not(:disabled) {
    background: var(--chat-v2-primary-hover);
}

.chat-v2-send-button:active:not(:disabled) {
    transform: scale(0.95);
}

.chat-v2-send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.chat-v2-send-icon {
    font-size: 18px;
}

/* Spinner */
.chat-v2-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: chatV2Spin 0.8s linear infinite;
}

@keyframes chatV2Spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   Welcome/Placeholder State
   ============================================ */
.chat-v2-welcome {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 20px;
    color: var(--chat-v2-text-secondary);
}

.chat-v2-welcome__icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    animation: chatV2Float 3s ease-in-out infinite;
}

@keyframes chatV2Float {
    0%, 100% { transform: translateY(0) rotate(-45deg); }
    50% { transform: translateY(-10px) rotate(-45deg); }
}

.chat-v2-welcome__title {
    margin: 0 0 8px 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--chat-v2-text-primary);
}

.chat-v2-welcome__subtitle {
    margin: 0 0 24px 0;
    font-size: 1rem;
    max-width: 500px;
    line-height: 1.6;
}

/* ============================================
   Thread Sidebar
   ============================================ */
.chat-v2-sidebar {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--chat-v2-surface);
    border-right: 1px solid var(--chat-v2-border);
}

.chat-v2-sidebar__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid var(--chat-v2-border);
}

.chat-v2-sidebar__title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
}

.chat-v2-sidebar__list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.chat-v2-thread-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px;
    margin-bottom: 4px;
    border-radius: var(--chat-v2-radius-md);
    cursor: pointer;
    transition: background 0.2s;
}

.chat-v2-thread-item:hover {
    background: var(--chat-v2-background);
}

.chat-v2-thread-item--active {
    background: rgba(0, 120, 212, 0.1);
    border-left: 3px solid var(--chat-v2-primary);
}

.chat-v2-thread-item__content {
    flex: 1;
    min-width: 0; /* Enable text truncation */
}

.chat-v2-thread-item__title {
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-v2-thread-item__date {
    font-size: 0.75rem;
    color: var(--chat-v2-text-secondary);
}

.chat-v2-thread-item__delete {
    opacity: 0;
    transition: opacity 0.2s;
}

.chat-v2-thread-item:hover .chat-v2-thread-item__delete {
    opacity: 1;
}

/* ============================================
   Empty State
   ============================================ */
.chat-v2-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
    text-align: center;
    color: var(--chat-v2-text-secondary);
}

.chat-v2-empty__text {
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 960px) {
    .chat-v2-message {
        max-width: 85%;
    }
    
    .chat-v2-header {
        padding: 12px 16px;
    }
    
    .chat-v2-footer {
        padding: 12px 16px;
    }
    
    .chat-v2-messages {
        padding: 12px;
    }
}

@media (max-width: 600px) {
    .chat-v2-message {
        max-width: 92%;
    }
    
    .chat-v2-textarea {
        font-size: 16px; /* Prevent iOS zoom */
    }
}