/* Chat Interface Styles */

/* Chat Header */
.chat-header {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: var(--blur-lg);
    border-bottom: var(--glass-border);
    padding: var(--space-5) var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: var(--header-height);
    position: relative;
}

.chat-header::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(124, 58, 237, 0.3), transparent);
}

.chat-header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-glass-subtle);
    pointer-events: none;
    z-index: -1;
}

.chat-info h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.chat-info span {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    font-weight: var(--font-weight-medium);
}

.chat-actions {
    display: flex;
    gap: var(--space-2);
}

.action-btn {
    background: transparent;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-2) var(--space-3);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
}

.action-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-secondary);
    color: var(--text-primary);
    transform: translateY(-1px);
}

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

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 0; /* Allows flex child to shrink */
}

/* Messages Area */
.messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
    scroll-behavior: smooth;
}

.message {
    display: flex;
    gap: var(--space-4);
    max-width: 85%;
    animation: messageSlideIn var(--duration-normal) ease-out;
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.message.user .message-avatar {
    background: var(--gradient-primary);
    color: var(--text-primary);
}

.message.assistant .message-avatar {
    background: var(--bg-quaternary);
    border: 2px solid var(--border-primary);
    color: var(--accent-primary);
}

.message-content {
    background: var(--bg-glass-medium);
    backdrop-filter: var(--blur-md);
    border: var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-4) var(--space-5);
    position: relative;
    box-shadow: var(--shadow-glass);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.message-content::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-glass-subtle);
    pointer-events: none;
    z-index: -1;
}

.message.user .message-content {
    background: var(--bg-glass-primary);
    backdrop-filter: var(--blur-lg);
    border: 1px solid rgba(124, 58, 237, 0.3);
    color: var(--text-primary);
    box-shadow: var(--shadow-glass-colored);
}

.message.user .message-content::before {
    background: linear-gradient(135deg, 
        rgba(124, 58, 237, 0.2) 0%, 
        rgba(147, 51, 234, 0.1) 50%, 
        rgba(168, 85, 247, 0.2) 100%);
}

.message.assistant .message-content {
    background: var(--bg-glass-medium);
}

.message-content:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.message-text {
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    word-wrap: break-word;
    white-space: pre-wrap;
}

.message-text br {
    line-height: 0.5;
    margin: 0;
}

/* Markdown elements within messages */
.message-text h1, .message-text h2, .message-text h3, 
.message-text h4, .message-text h5, .message-text h6 {
    margin: var(--space-3) 0 var(--space-2) 0;
    line-height: var(--line-height-tight);
}

.message-text p {
    margin: var(--space-2) 0;
    line-height: var(--line-height-normal);
}

.message-text ul, .message-text ol {
    margin: var(--space-2) 0;
    padding-left: var(--space-4);
}

.message-text li {
    margin: var(--space-1) 0;
    line-height: var(--line-height-normal);
}

.message-text blockquote {
    margin: var(--space-2) 0;
    padding-left: var(--space-3);
    border-left: 3px solid var(--primary);
    background: rgba(139, 92, 246, 0.05);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
}

.message-text hr {
    margin: var(--space-3) 0;
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.message.user .message-text {
    color: var(--text-primary);
}

.message.assistant .message-text {
    color: var(--text-primary);
}

.message-time {
    font-size: var(--font-size-xs);
    color: var(--text-quaternary);
    margin-top: var(--space-2);
    opacity: 0.6;
    transition: opacity var(--transition-normal);
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.message:hover .message-time {
    opacity: 1;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: var(--space-4);
    max-width: 85%;
    align-self: flex-start;
    animation: messageSlideIn var(--duration-normal) ease-out;
}

.typing-indicator .message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--bg-quaternary);
    border: 2px solid var(--border-primary);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
}

.typing-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-4) var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.typing-dots {
    display: flex;
    gap: var(--space-1);
}

.typing-dot {
    width: 6px;
    height: 6px;
    background: var(--accent-primary);
    border-radius: var(--radius-full);
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-dot:nth-child(2) {
    animation-delay: -0.16s;
}

/* Input Container */
.input-container {
    background: var(--bg-glass-light);
    backdrop-filter: var(--blur-lg);
    border-top: var(--glass-border);
    padding: var(--space-5) var(--space-6);
    position: relative;
}

.input-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(124, 58, 237, 0.3), transparent);
}

.input-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-glass-subtle);
    pointer-events: none;
    z-index: -1;
}

.message-input {
    display: flex;
    gap: var(--space-3);
    background: var(--bg-glass-medium);
    backdrop-filter: var(--blur-md);
    border: var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-1);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-glass);
    position: relative;
}

.message-input::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    background: var(--gradient-glass-subtle);
    pointer-events: none;
    z-index: -1;
}

.message-input:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(108, 99, 255, 0.2);
    transform: translateY(-2px);
}

.message-input textarea {
    flex: 1;
    background: transparent;
    border: none;
    padding: var(--space-4) var(--space-5);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    resize: none;
    outline: none;
    min-height: 50px;
    max-height: 200px;
    line-height: var(--line-height-normal);
}

.message-input textarea::placeholder {
    color: var(--text-tertiary);
}

.message-input button {
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    min-width: 50px;
    height: 50px;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: flex-end;
}

.message-input button:enabled:hover {
    background: linear-gradient(135deg, var(--accent-secondary), var(--accent-tertiary));
    transform: scale(1.05);
}

.message-input button:disabled {
    background: var(--bg-quaternary);
    cursor: not-allowed;
    opacity: 0.5;
}

.message-input button i {
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    transition: transform var(--transition-fast);
}

.message-input button:enabled:hover i {
    transform: translateX(2px);
}

.input-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-3);
    font-size: var(--font-size-xs);
    color: var(--text-quaternary);
}

/* Chat List Sidebar */
.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
}

.chat-session {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-3);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.chat-session:hover {
    background: var(--bg-quaternary);
    border-color: var(--border-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.chat-session.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
}

.chat-session-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-session.active .chat-session-title {
    color: var(--text-primary);
}

.chat-session-preview {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: var(--space-2);
}

.chat-session.active .chat-session-preview {
    color: rgba(255, 255, 255, 0.8);
}

.chat-session-time {
    font-size: var(--font-size-xs);
    color: var(--text-quaternary);
}

.chat-session.active .chat-session-time {
    color: rgba(255, 255, 255, 0.7);
}

/* New Chat Button */
.new-chat-btn {
    width: 100%;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    box-shadow: var(--shadow-md);
}

.new-chat-btn:hover {
    background: linear-gradient(135deg, var(--accent-secondary), var(--accent-tertiary));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

/* Logout Button */
.logout-btn {
    width: 100%;
    background: transparent;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.logout-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--error);
    color: var(--error);
    transform: translateY(-1px);
}

/* Empty state */
.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-12);
    color: var(--text-tertiary);
}

.empty-state i {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-6);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
}

.empty-state p {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    max-width: 400px;
}

/* Animations */
@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes typingBounce {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .chat-header {
        padding: var(--space-4);
    }
    
    .messages {
        padding: var(--space-4);
        gap: var(--space-4);
    }
    
    .message {
        max-width: 95%;
    }
    
    .input-container {
        padding: var(--space-4);
    }
    
    .message-input textarea {
        padding: var(--space-3) var(--space-4);
        min-height: 44px;
    }
    
    .message-input button {
        min-width: 44px;
        height: 44px;
        padding: var(--space-2);
    }
}

/* Enhanced Markdown Styling */

/* Code blocks */
.code-block {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    margin: var(--space-3) 0;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.5;
    color: #e2e8f0;
    position: relative;
}

.code-block::before {
    content: attr(data-language);
    position: absolute;
    top: var(--space-2);
    right: var(--space-3);
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    text-transform: uppercase;
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.5px;
}

.code-block code {
    background: none;
    padding: 0;
    border: none;
    font-size: inherit;
    color: inherit;
    display: block;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Inline code */
.inline-code {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    padding: var(--space-1) var(--space-2);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    font-size: 0.9em;
    color: #fbbf24;
    font-weight: var(--font-weight-medium);
}

/* Headers */
.markdown-h1 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin: var(--space-4) 0 var(--space-3) 0;
    border-bottom: 2px solid rgba(124, 58, 237, 0.3);
    padding-bottom: var(--space-2);
}

.markdown-h2 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: var(--space-4) 0 var(--space-2) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: var(--space-1);
}

.markdown-h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: var(--space-3) 0 var(--space-2) 0;
}

.markdown-h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: var(--space-3) 0 var(--space-2) 0;
}

.markdown-h5 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: var(--space-2) 0 var(--space-1) 0;
}

.markdown-h6 {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    margin: var(--space-2) 0 var(--space-1) 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Horizontal Rules */
.markdown-hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(124, 58, 237, 0.5), transparent);
    margin: var(--space-4) 0;
    border-radius: 1px;
}

/* Blockquotes */
.markdown-quote {
    border-left: 4px solid rgba(124, 58, 237, 0.5);
    background: rgba(124, 58, 237, 0.05);
    padding: var(--space-3) var(--space-4);
    margin: var(--space-3) 0;
    border-radius: var(--radius-md);
    font-style: italic;
    color: var(--text-secondary);
    position: relative;
}

.markdown-quote::before {
    content: '"';
    font-size: 2em;
    color: rgba(124, 58, 237, 0.3);
    position: absolute;
    left: var(--space-2);
    top: 0;
    font-family: serif;
}

/* Lists */
.markdown-ul {
    margin: var(--space-3) 0;
    padding-left: 0;
    list-style: none;
}

.markdown-ol {
    margin: var(--space-3) 0;
    padding-left: var(--space-6);
    list-style: decimal;
    color: var(--text-primary);
}

.markdown-ol-item {
    padding: var(--space-1) 0;
    line-height: 1.6;
    color: var(--text-primary);
}

.markdown-li {
    position: relative;
    /* add a bit more left padding so the centered marker has room */
    padding: var(--space-1) 0 var(--space-1) var(--space-6);
    color: var(--text-primary);
    line-height: 1.6;
}

.markdown-li::before {
    content: '•';
    color: rgba(124, 58, 237, 0.7);
    font-weight: var(--font-weight-bold);
    position: absolute;
    left: var(--space-3);
    font-size: 1.1em;
    /* Vertically center the bullet relative to the first line of text */
    top: 50%;
    transform: translateY(-50%);
    line-height: 1;
}

/* Nested lists */
.markdown-li[data-level="1"]::before {
    content: '◦';
    left: calc(var(--space-3) + var(--space-4));
}

.markdown-li[data-level="2"]::before {
    content: '▪';
    left: calc(var(--space-3) + var(--space-8));
}

.markdown-li[data-level="1"] {
    padding-left: calc(var(--space-6) + var(--space-4));
}

.markdown-li[data-level="2"] {
    padding-left: calc(var(--space-6) + var(--space-8));
}

/* Task Lists */
.markdown-task-list {
    margin: var(--space-3) 0;
    padding-left: 0;
    list-style: none;
}

.markdown-task-item {
    position: relative;
    padding: var(--space-2) 0 var(--space-2) var(--space-6);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
}

.markdown-task-item input[type="checkbox"] {
    margin: 0;
    margin-top: 2px;
    width: 16px;
    height: 16px;
    accent-color: rgba(124, 58, 237, 0.8);
    cursor: pointer;
}

.markdown-task-item.completed {
    color: var(--text-tertiary);
    text-decoration: line-through;
}

/* Images */
.markdown-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--space-3) 0;
    box-shadow: var(--shadow-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Links */
.markdown-link {
    color: #60a5fa;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
    font-weight: var(--font-weight-medium);
}

.markdown-link:hover {
    color: #93c5fd;
    border-bottom-color: #60a5fa;
    text-shadow: 0 0 8px rgba(96, 165, 250, 0.3);
}

/* Strikethrough */
del {
    color: var(--text-tertiary);
    text-decoration-color: rgba(239, 68, 68, 0.7);
    text-decoration-thickness: 2px;
}

/* Enhanced text styling */
strong {
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

em {
    font-style: italic;
    color: var(--text-secondary);
}

/* Math Expression Styles */
.math-block {
    display: block;
    margin: var(--space-4) 0;
    padding: var(--space-3);
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--radius-md);
    text-align: center;
    overflow-x: auto;
}

.math-inline {
    display: inline;
    padding: 2px 4px;
    background: rgba(139, 92, 246, 0.1);
    border-radius: var(--radius-sm);
    margin: 0 2px;
}

/* KaTeX font size adjustments */
.math-block .katex {
    font-size: 1.2em;
}

.math-inline .katex {
    font-size: 1em;
}

/* Math error styling */
.katex-error {
    color: var(--error) !important;
    background: rgba(239, 68, 68, 0.1) !important;
    border: 1px solid rgba(239, 68, 68, 0.2) !important;
    border-radius: var(--radius-sm);
    padding: 2px 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

/* Math rendering loading state */
.math-loading {
    background: rgba(139, 92, 246, 0.05);
    color: var(--text-tertiary);
    font-style: italic;
}

/* Responsive math */
@media (max-width: 768px) {
    .math-block {
        font-size: 0.9em;
        padding: var(--space-2);
        margin: var(--space-3) 0;
    }
    
    .math-block .katex {
        font-size: 1em;
    }
    
    .math-inline .katex {
        font-size: 0.9em;
    }
}