/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f8fafc;
    color: #1e293b;
    line-height: 1.6;
    overflow-x: hidden;
}

/* App layout */
.app {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: white;
    border-bottom: 1px solid #e2e8f0;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    z-index: 10;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0f172a;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: #f1f5f9;
    border-radius: 0.5rem;
    font-size: 0.875rem;
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #ef4444;
    transition: background-color 0.3s ease;
}

.status-indicator.connected {
    background: #10b981;
}

.status-indicator.connecting {
    background: #f59e0b;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.header-right {
    display: flex;
    gap: 0.75rem;
}

/* Main content */
.main-content {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: white;
    border-right: 1px solid #e2e8f0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
}

.sidebar-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #0f172a;
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.chat-item {
    padding: 0.75rem 1rem;
    margin-bottom: 0.25rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.chat-item:hover {
    background: #f8fafc;
    border-color: #e2e8f0;
}

.chat-item.active {
    background: #eff6ff;
    border-color: #3b82f6;
}

.chat-item-title {
    font-weight: 500;
    color: #0f172a;
    margin-bottom: 0.25rem;
    font-size: 0.875rem;
    line-height: 1.25;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.chat-item-meta {
    font-size: 0.75rem;
    color: #64748b;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Chat area */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Welcome screen */
.welcome-screen {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
}

.welcome-content {
    text-align: center;
    max-width: 400px;
    padding: 2rem;
}

.welcome-content h2 {
    font-size: 2rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 1rem;
}

.welcome-content p {
    color: #64748b;
    margin-bottom: 2rem;
    font-size: 1.125rem;
}

.welcome-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Chat container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: white;
    overflow-y: scroll;
}

.chat-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #0f172a;
    margin-bottom: 0.25rem;
}

.chat-model {
    font-size: 0.875rem;
    color: #64748b;
}

.chat-actions {
    display: flex;
    gap: 0.5rem;
}

/* Messages */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    display: flex;
    gap: 0.75rem;
    max-width: 100%;
}

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

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 600;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: #3b82f6;
    color: white;
}

.message.assistant .message-avatar {
    background: #10b981;
    color: white;
}

.message-content {
    flex: 1;
    max-width: calc(100% - 48px);
}

.message.user .message-content {
    display: flex;
    justify-content: flex-end;
}

.message-bubble {
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    word-wrap: break-word;
    max-width: 70%;
}

.message.user .message-bubble {
    background: #3b82f6;
    color: white;
    border-bottom-right-radius: 0.25rem;
}

.message.assistant .message-bubble {
    background: #f1f5f9;
    color: #0f172a;
    border-bottom-left-radius: 0.25rem;
}

.message-image {
    max-width: 300px;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
}

.message-text {
    white-space: pre-wrap;
    line-height: 1.5;
}

.message-time {
    font-size: 0.75rem;
    color: #64748b;
    margin-top: 0.25rem;
    text-align: right;
}

.message.assistant .message-time {
    text-align: left;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 0.75rem;
    padding: 1rem 0;
}

.typing-indicator .message-avatar {
    background: #10b981;
    color: white;
}

.typing-dots {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.75rem 1rem;
    background: #f1f5f9;
    border-radius: 1rem;
    border-bottom-left-radius: 0.25rem;
}

.typing-dot {
    width: 6px;
    height: 6px;
    background: #64748b;
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* Input area */
.input-area {
    padding: 1rem 1.5rem;
    border-top: 1px solid #e2e8f0;
    background: white;
}

.input-container {
    max-width: 100%;
}

.image-preview {
    margin-bottom: 0.75rem;
    position: relative;
    display: inline-block;
}

.image-preview img {
    max-width: 200px;
    max-height: 200px;
    border-radius: 0.5rem;
    border: 2px solid #e2e8f0;
}

.remove-image {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #ef4444;
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: bold;
}

.input-row {
    display: flex;
    align-items: flex-end;
    gap: 0.5rem;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 0.75rem;
    padding: 0.5rem;
    transition: border-color 0.2s ease;
}

.input-row:focus-within {
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-btn {
    padding: 0.5rem;
    border-radius: 0.5rem;
}

#messageInput {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    outline: none;
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.5;
    max-height: 120px;
    min-height: 24px;
}

#messageInput::placeholder {
    color: #94a3b8;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid transparent;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    background: transparent;
    font-family: inherit;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: #3b82f6;
    color: white;
    border-color: #3b82f6;
}

.btn-primary:hover:not(:disabled) {
    background: #2563eb;
    border-color: #2563eb;
}

.btn-secondary {
    background: #f1f5f9;
    color: #475569;
    border-color: #e2e8f0;
}

.btn-secondary:hover:not(:disabled) {
    background: #e2e8f0;
    border-color: #cbd5e1;
}

.btn-ghost {
    color: #64748b;
}

.btn-ghost:hover:not(:disabled) {
    background: #f1f5f9;
    color: #475569;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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

.modal-content {
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #0f172a;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #64748b;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 0.25rem;
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: #f1f5f9;
    color: #475569;
}

.modal-body {
    padding: 1.5rem;
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid #e2e8f0;
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
}

/* Form elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    transition: border-color 0.2s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group small {
    display: block;
    color: #6b7280;
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* Connection test result */
.connection-test-result {
    margin-top: 0.75rem;
    padding: 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    display: none;
}

.connection-test-result.success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.connection-test-result.error {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #e2e8f0;
    border-top: 4px solid #3b82f6;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay p {
    color: #64748b;
    font-weight: 500;
}

/* Responsive design */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px;
        top: 0;
        height: 100vh;
        z-index: 100;
        transition: left 0.3s ease;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .chat-area {
        width: 100%;
    }
    
    .header {
        padding: 1rem;
    }
    
    .header-left {
        gap: 1rem;
    }
    
    .app-title {
        font-size: 1.25rem;
    }
    
    .welcome-actions {
        flex-direction: column;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .modal-footer {
        flex-direction: column-reverse;
    }
    
    .modal-footer .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Selection styling */
::selection {
    background: rgba(59, 130, 246, 0.2);
}

/* Focus styles for accessibility */
.btn:focus-visible,
button:focus-visible {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}