* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #FFFFFF;
    color: #333333;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100%;
}

/* Sidebar Styles */
.sidebar {
    width: 280px;
    background-color: #F5F5F5;
    border-right: 1px solid #E0E0E0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(-100%);
    position: relative;
    z-index: 100;
}

.sidebar.open {
    transform: translateX(0);
}

.sidebar.closed {
    transform: translateX(-100%);
    width: 0;
    border-right: none;
    overflow: hidden;
}

.sidebar.closed .sidebar-header,
.sidebar.closed .new-chat-btn,
.sidebar.closed .chat-history {
    opacity: 0;
    pointer-events: none;
}

.sidebar .sidebar-header,
.sidebar .new-chat-btn,
.sidebar .chat-history {
    transition: opacity 0.2s ease;
}

.sidebar-toggle {
    position: fixed;
    left: 20px;
    top: 20px;
    width: 40px;
    height: 40px;
    background-color: #FFFFFF;
    border: 1px solid #E0E0E0;
    border-radius: 8px;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    transition: background-color 0.2s, opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateX(-10px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.sidebar-toggle:hover {
    background-color: #F5F5F5;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.sidebar-toggle.visible {
    display: flex;
    opacity: 1;
    transform: translateX(0);
}

.sidebar-toggle svg {
    width: 20px;
    height: 20px;
    color: #333333;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #E0E0E0;
}

.app-logo {
    font-size: 18px;
    font-weight: 600;
    color: #333333;
}

.collapse-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: #666666;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.collapse-btn:hover {
    color: #333333;
}

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    margin: 12px 16px;
    background-color: #FFFFFF;
    border: 1px solid #D1D5DB;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    color: #333333;
    transition: background-color 0.2s;
}

.new-chat-btn:hover {
    background-color: #F9FAFB;
}

.new-chat-btn svg {
    width: 16px;
    height: 16px;
}

.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.history-section {
    margin-bottom: 24px;
}

.section-header {
    font-size: 11px;
    font-weight: 600;
    color: #9CA3AF;
    text-transform: uppercase;
    padding: 8px 20px;
    letter-spacing: 0.5px;
}

.chat-item {
    padding: 10px 20px;
    cursor: pointer;
    font-size: 14px;
    color: #333333;
    transition: background-color 0.2s;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chat-item:hover {
    background-color: #F9FAFB;
}

.chat-item.active {
    background-color: #E5E7EB;
}

.empty-state {
    padding: 40px 20px;
    text-align: center;
    color: #9CA3AF;
}

.empty-state p {
    font-size: 14px;
    margin-bottom: 8px;
}

.empty-state .empty-hint {
    font-size: 12px;
    color: #D1D5DB;
}

/* Main Content Styles */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: #FFFFFF;
    overflow: hidden;
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    width: 100%;
}

.container {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
    max-width: 100%;
    position: relative;
}

.container.has-messages {
    justify-content: space-between;
}

.container:not(.has-messages) {
    justify-content: center;
}

.heading {
    font-size: 1.8em;
    font-weight: 500;
    color: #333333;
    text-align: center;
    transition: opacity 0.3s ease, transform 0.3s ease;
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
}

.container.has-messages .heading {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-50%) translateY(-20px);
}

.chat-container {
    width: 100%;
    max-width: 768px;
    overflow-y: auto;
    padding: 20px 0;
    display: flex;
    flex-direction: column;
    gap: 24px;
    opacity: 0;
    max-height: 0;
    transition: opacity 0.3s ease, max-height 0.3s ease;
    margin-bottom: 20px;
}

.container.has-messages .chat-container {
    opacity: 1;
    max-height: calc(100vh - 200px);
    flex: 1;
}

.message-wrapper {
    display: flex;
    flex-direction: column;
    gap: 4px;
    animation: fadeInUp 0.3s ease;
}

.message-wrapper.user {
    align-items: flex-end;
}

.message-wrapper.assistant {
    align-items: flex-start;
}

.message {
    padding: 12px 16px;
    border-radius: 12px;
    max-width: 85%;
    word-wrap: break-word;
    line-height: 1.5;
}

.message.user {
    background-color: #D1D5DB;
    color: #1F2937;
    border: 1px solid #D1D5DB;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.message.assistant {
    background-color: transparent;
    color: #333333;
    border: none;
    padding: 12px 0;
    box-shadow: none;
}

.message-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: #9CA3AF;
    padding: 4px 0;
}

.message-meta svg {
    width: 14px;
    height: 14px;
}

.message-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 8px;
    opacity: 0;
    transition: opacity 0.2s;
}

.message-wrapper:hover .message-actions {
    opacity: 1;
}

.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: #9CA3AF;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.action-btn:hover {
    color: #333333;
}

.action-btn svg {
    width: 16px;
    height: 16px;
}

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

.feedback-message {
    margin-top: 12px;
    padding: 8px 12px;
    background-color: #F0F9FF;
    border: 1px solid #BAE6FD;
    border-radius: 8px;
    color: #0369A1;
    font-size: 13px;
    animation: fadeInUp 0.3s ease;
}

.feedback-form {
    margin-top: 12px;
    padding: 12px;
    background-color: #F9FAFB;
    border: 1px solid #E5E7EB;
    border-radius: 8px;
    animation: fadeInUp 0.3s ease;
}

.feedback-label {
    font-size: 13px;
    font-weight: 500;
    color: #374151;
    margin-bottom: 8px;
}

.feedback-input {
    width: 100%;
    min-height: 60px;
    padding: 8px 12px;
    border: 1px solid #D1D5DB;
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 8px;
    outline: none;
    transition: border-color 0.2s;
}

.feedback-input:focus {
    border-color: #9CA3AF;
}

.feedback-submit-btn {
    padding: 6px 16px;
    background-color: #333333;
    color: #FFFFFF;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.feedback-submit-btn:hover {
    background-color: #1F2937;
}

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

.input-container {
    width: 100%;
    max-width: 768px;
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: #F5F5F5;
    border: 1px solid #E0E0E0;
    border-radius: 24px;
    padding: 12px 16px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, margin-top 0.3s ease;
    position: relative;
    z-index: 10;
}

.container:not(.has-messages) .input-container {
    margin-top: 0;
}

.container.has-messages .input-container {
    margin-top: auto;
}

.icon-button {
    background: none;
    border: none;
    cursor: pointer;
    color: #9CA3AF;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
    flex-shrink: 0;
}

.icon-button:hover {
    color: #6B7280;
}

.message-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 16px;
    color: #333333;
    background: transparent;
    resize: none;
    min-height: 24px;
    max-height: 120px;
    font-family: inherit;
    line-height: 1.5;
}

.message-input::placeholder {
    color: #AAAAAA;
}

.model-selector {
    display: flex;
    align-items: center;
    gap: 6px;
    color: #333333;
    font-size: 14px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 8px;
    transition: background-color 0.2s;
    flex-shrink: 0;
}

.model-selector:hover {
    background-color: #E5E7EB;
}

.model-text {
    font-weight: 500;
}

.send-button {
    background-color: #D1D5DB;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #FFFFFF;
    transition: background-color 0.2s;
    flex-shrink: 0;
}

.send-button:hover {
    background-color: #9CA3AF;
}

.send-button:active {
    transform: scale(0.95);
}

.send-button:disabled {
    background-color: #E5E7EB;
    cursor: not-allowed;
}

/* Scrollbar styling */
.chat-container::-webkit-scrollbar,
.chat-history::-webkit-scrollbar {
    width: 8px;
}

.chat-container::-webkit-scrollbar-track,
.chat-history::-webkit-scrollbar-track {
    background: transparent;
}

.chat-container::-webkit-scrollbar-thumb,
.chat-history::-webkit-scrollbar-thumb {
    background: #D1D5DB;
    border-radius: 4px;
}

.chat-container::-webkit-scrollbar-thumb:hover,
.chat-history::-webkit-scrollbar-thumb:hover {
    background: #9CA3AF;
}

/* Context Menu */
.context-menu {
    position: fixed;
    background-color: #FFFFFF;
    border: 1px solid #E0E0E0;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    padding: 4px;
    min-width: 160px;
    z-index: 10000;
    display: none;
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.15s ease, transform 0.15s ease;
}

.context-menu.show {
    display: block;
    opacity: 1;
    transform: scale(1);
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 14px;
    color: #333333;
    border-radius: 6px;
    transition: background-color 0.15s;
}

.context-menu-item:hover {
    background-color: #F5F5F5;
}

.context-menu-item svg {
    width: 16px;
    height: 16px;
    color: #666666;
}

.context-menu-item:last-child {
    color: #DC2626;
}

.context-menu-item:last-child svg {
    color: #DC2626;
}

.context-menu-item:last-child:hover {
    background-color: #FEE2E2;
}

/* Image Preview */
.image-preview-container {
    width: 100%;
    max-width: 768px;
    padding: 12px 16px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.image-preview-item {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #E0E0E0;
}

.image-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.remove-image-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 24px;
    height: 24px;
    background-color: rgba(0, 0, 0, 0.6);
    border: none;
    border-radius: 50%;
    color: #FFFFFF;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.remove-image-btn:hover {
    background-color: rgba(0, 0, 0, 0.8);
}

.remove-image-btn svg {
    width: 12px;
    height: 12px;
}

/* Message Images */
.message-images {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
    max-width: 85%;
}

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

.message-wrapper.assistant .message-images {
    justify-content: flex-start;
}

.message-image {
    max-width: 300px;
    max-height: 300px;
    border-radius: 8px;
    object-fit: contain;
    border: 1px solid #E0E0E0;
}

.message-wrapper.user .message-image {
    border-color: #D1D5DB;
}

/* Responsive design */
@media (max-width: 768px) {
    .sidebar {
        width: 240px;
    }
    
    .heading {
        font-size: 1.5em;
    }
    
    .input-container {
        width: 95%;
        padding: 10px 14px;
    }
    
    .chat-container {
        max-width: 95%;
    }
    
    .model-selector {
        font-size: 12px;
        padding: 4px 8px;
    }
    
    .send-button {
        width: 36px;
        height: 36px;
    }
}