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

body {
    font-family: ui-sans-serif, -apple-system, system-ui, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    font-size: 18px;
    background-color: #1d1d1d;
    color: #FFFFFF;
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
}

/* Sidebar Styles */
.sidebar {
    width: 260px;
    background-color: #171717;
    border-right: 1px solid #2d2d2d;
    display: flex;
    flex-direction: column;
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1000;
    transition: width 0.3s ease, transform 0.3s ease;
}

.sidebar.collapsed {
    width: 48px;
    min-width: 48px;
    max-width: 48px;
    transform: translateX(0);
    overflow: hidden;
    position: fixed;
    left: 0;
    top: 0;
    scrollbar-width: none;
    -ms-overflow-style: none;
    touch-action: none;
    user-select: none;
}

.sidebar.collapsed .sidebar-header {
    padding: 16px 0;
    justify-content: center;
    width: 48px;
}

.sidebar.collapsed .sidebar-logo {
    display: none;
}

.sidebar.collapsed .sidebar-toggle {
    opacity: 1;
    pointer-events: auto;
}

.sidebar.collapsed:hover {
    background-color: #1d1d1d;
}

.sidebar.collapsed .sidebar-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 0;
    width: 48px;
    overflow: hidden;
    touch-action: none;
}

.sidebar.collapsed .sidebar-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 0;
    width: 48px;
    overflow: hidden;
    touch-action: none;
}

.sidebar.collapsed .nav-section {
    margin-bottom: 0;
    width: 48px;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow: hidden;
    touch-action: none;
}

.sidebar.collapsed .section-header {
    display: none;
}

.sidebar.collapsed .nav-item {
    justify-content: center;
    padding: 12px 0;
    margin: 2px 0;
    border-radius: 6px;
    width: 36px;
    margin-left: 6px;
    margin-right: 6px;
    touch-action: manipulation;
    overflow: hidden;
}

.sidebar.collapsed .nav-item span {
    display: none;
}

.sidebar.collapsed .nav-item svg {
    margin: 0;
}

.sidebar.collapsed .history-list {
    display: none;
}

.sidebar.collapsed .history-item-wrapper {
    justify-content: center;
    margin-bottom: 2px;
}

.sidebar.collapsed .history-menu-btn {
    display: none;
}

.sidebar.collapsed .user-avatar {
    width: 24px;
    height: 24px;
}

/* 完全禁用收起状态下的滚动 */
.sidebar.collapsed::-webkit-scrollbar {
    display: none;
    width: 0;
    height: 0;
}

.sidebar.collapsed * {
    overflow: hidden !important;
    scrollbar-width: none !important;
    -ms-overflow-style: none !important;
}

.sidebar.collapsed *::-webkit-scrollbar {
    display: none !important;
    width: 0 !important;
    height: 0 !important;
}

/* Tooltip for collapsed sidebar */
.sidebar.collapsed .nav-item {
    position: relative;
}

.sidebar.collapsed .nav-item::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    background-color: #2d2d2d;
    color: #FFFFFF;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    margin-left: 8px;
    z-index: 1001;
}

.sidebar.collapsed .nav-item:hover::after {
    opacity: 1;
}

/* Context Menu */
.context-menu {
    position: fixed;
    background-color: #2d2d2d;
    border: 1px solid #404040;
    border-radius: 8px;
    padding: 6px 0;
    min-width: 180px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 10000;
    backdrop-filter: blur(8px);
    display: none;
    opacity: 1;
    transform: scale(1);
    transition: all 0.15s ease;
    pointer-events: auto;
}

.context-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    color: #FFFFFF;
    font-size: 14px;
}

.context-menu-item:hover {
    background-color: #404040;
}

.context-menu-delete {
    color: #ff6b6b;
}

.context-menu-delete:hover {
    background-color: rgba(255, 107, 107, 0.1);
}

.context-menu-item svg {
    flex-shrink: 0;
    opacity: 0.8;
}

.context-menu-delete svg {
    color: #ff6b6b;
}

/* Model Menu */
.model-menu {
    position: fixed;
    background-color: #2d2d2d;
    border: 1px solid #404040;
    border-radius: 12px;
    padding: 0;
    min-width: 320px;
    max-width: 380px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 10000;
    backdrop-filter: blur(8px);
    opacity: 0;
    transform: scale(0.95) translateY(10px);
    transition: all 0.15s ease;
}

.model-menu[style*="block"] {
    opacity: 1;
    transform: scale(1) translateY(0);
}

.model-menu-section {
    padding: 8px 0;
}

.model-menu-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    color: #FFFFFF;
}

.model-menu-item:hover {
    background-color: #404040;
}

.model-menu-item.active {
    background-color: rgba(255, 255, 255, 0.1);
    border-left: 3px solid #FFFFFF;
    padding-left: 13px;
}

.model-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.model-name {
    font-size: 14px;
    font-weight: 500;
    color: #FFFFFF;
}

.model-description {
    font-size: 12px;
    color: #a0a0a0;
}

.model-check {
    color: #FFFFFF;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.model-menu-item.active .model-check {
    opacity: 1;
}

/* User Menu */
.user-menu {
    position: fixed;
    background-color: #2d2d2d;
    border: 1px solid #404040;
    border-radius: 12px;
    padding: 0;
    min-width: 280px;
    max-width: 320px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 10000;
    backdrop-filter: blur(8px);
    opacity: 0;
    transform: scale(0.95) translateY(10px);
    transition: all 0.15s ease;
}

.user-menu[style*="block"] {
    opacity: 1;
    transform: scale(1) translateY(0);
}

.user-menu-header {
    padding: 16px;
    border-bottom: 1px solid #404040;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar-large {
    width: 48px;
    height: 48px;
    background-color: #404040;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.user-avatar-large svg {
    color: #FFFFFF;
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-size: 16px;
    font-weight: 600;
    color: #FFFFFF;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-email {
    font-size: 14px;
    color: #a0a0a0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-menu-section {
    padding: 8px 0;
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    color: #FFFFFF;
    font-size: 14px;
}

.user-menu-item:hover {
    background-color: #404040;
}

.user-menu-item[data-action="logout"] {
    color: #ff6b6b;
}

.user-menu-item[data-action="logout"]:hover {
    background-color: rgba(255, 107, 107, 0.1);
}

.user-menu-item svg {
    flex-shrink: 0;
    opacity: 0.8;
}

.user-menu-item[data-action="logout"] svg {
    color: #ff6b6b;
}

.user-menu-divider {
    height: 1px;
    background-color: #404040;
    margin: 8px 0;
}

/* Auth Modals */
.auth-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 20000;
    backdrop-filter: blur(8px);
}

.auth-modal {
    background-color: #2d2d2d;
    border-radius: 16px;
    width: 90%;
    max-width: 440px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    position: relative;
}

.welcome-modal {
    text-align: center;
    padding: 48px 32px;
}

.welcome-title {
    font-size: 32px;
    font-weight: 600;
    color: #FFFFFF;
    margin-bottom: 16px;
    line-height: 1.2;
}

.welcome-subtitle {
    font-size: 16px;
    color: #a0a0a0;
    line-height: 1.5;
    margin-bottom: 32px;
}

.auth-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.auth-btn {
    padding: 14px 24px;
    border-radius: 24px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.auth-btn.primary {
    background-color: #FFFFFF;
    color: #1a1a1a;
}

.auth-btn.primary:hover {
    background-color: #e5e5e5;
    transform: translateY(-1px);
}

.auth-btn.secondary {
    background-color: transparent;
    color: #FFFFFF;
    border: 1px solid #404040;
}

.auth-btn.secondary:hover {
    background-color: #404040;
    border-color: #565656;
}

.auth-btn.google-btn {
    background-color: #FFFFFF;
    color: #1a1a1a;
    border: 1px solid #e0e0e0;
}

.auth-btn.google-btn:hover {
    background-color: #f5f5f5;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.auth-btn.full-width {
    width: 100%;
}

.stay-logged-out-btn {
    background: none;
    border: none;
    color: #a0a0a0;
    font-size: 14px;
    cursor: pointer;
    text-decoration: underline;
    padding: 8px;
}

.stay-logged-out-btn:hover {
    color: #FFFFFF;
}

.auth-footer {
    margin-top: 24px;
}

/* Login/Signup Modal Styles */
.auth-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid #404040;
}

.auth-modal-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: #FFFFFF;
    margin: 0;
    flex: 1;
    text-align: center;
}

.back-btn, .close-btn {
    background: none;
    border: none;
    color: #a0a0a0;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-btn:hover, .close-btn:hover {
    background-color: #404040;
    color: #FFFFFF;
}

.auth-modal-content {
    padding: 24px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: #FFFFFF;
}

.form-group input {
    padding: 12px 16px;
    background-color: #1a1a1a;
    border: 1px solid #404040;
    border-radius: 8px;
    color: #FFFFFF;
    font-size: 16px;
    transition: border-color 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #FFFFFF;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.1);
}

.form-group input::placeholder {
    color: #a0a0a0;
}

.auth-divider {
    margin: 24px 0;
    text-align: center;
    position: relative;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background-color: #404040;
}

.auth-divider span {
    background-color: #2d2d2d;
    color: #a0a0a0;
    padding: 0 16px;
    font-size: 14px;
    position: relative;
}

/* Project Creation Modal */
.project-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 20000;
    backdrop-filter: blur(8px);
}

.project-modal {
    background-color: #2d2d2d;
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    position: relative;
}

.project-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 24px 16px 24px;
    border-bottom: 1px solid #404040;
}

.project-modal-header h2 {
    font-size: 24px;
    font-weight: 600;
    color: #FFFFFF;
    margin: 0;
}

.project-modal-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.project-settings-btn {
    background: none;
    border: none;
    color: #a0a0a0;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-settings-btn:hover {
    background-color: #404040;
    color: #FFFFFF;
}

.project-modal-content {
    padding: 24px;
}

.project-name-input-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding: 16px;
    border: 1px solid #404040;
    border-radius: 12px;
    background-color: #2d2d2d;
}

.emoji-selector {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background-color 0.2s ease;
    position: relative;
}

.emoji-selector:hover {
    background-color: #404040;
}

.selected-emoji {
    font-size: 20px;
}

.emoji-selector svg {
    color: #a0a0a0;
    transition: transform 0.2s ease;
}

.emoji-selector.open svg {
    transform: rotate(180deg);
}

.project-name-input {
    flex: 1;
    background: none;
    border: none;
    color: #FFFFFF;
    font-size: 16px;
    outline: none;
    padding: 0;
}

.project-name-input::placeholder {
    color: #a0a0a0;
}

.project-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
}

.category-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background-color: #1a1a1a;
    border: 1px solid #404040;
    border-radius: 24px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: #FFFFFF;
    font-size: 14px;
}

.category-btn:hover {
    background-color: #404040;
    border-color: #565656;
    transform: translateY(-1px);
}

.category-btn.selected {
    background-color: #0084ff;
    border-color: #0084ff;
    color: #FFFFFF;
}

.category-emoji {
    font-size: 16px;
}

.project-description {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background-color: #1a1a1a;
    border-radius: 12px;
    margin-bottom: 24px;
}

.description-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.description-text p {
    margin: 0;
    color: #a0a0a0;
    font-size: 14px;
    line-height: 1.5;
}

.project-modal-actions {
    display: flex;
    justify-content: flex-end;
}

.project-btn {
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    min-width: 120px;
}

.project-btn.create {
    background-color: #FFFFFF;
    color: #1a1a1a;
}

.project-btn.create:hover {
    background-color: #e5e5e5;
    transform: translateY(-1px);
}

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

/* Emoji Picker */
.emoji-picker {
    position: absolute;
    background-color: #2d2d2d;
    border: 1px solid #404040;
    border-radius: 12px;
    padding: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 21000;
    backdrop-filter: blur(8px);
    opacity: 0;
    transform: scale(0.95);
    transition: all 0.15s ease;
}

.emoji-picker[style*="block"] {
    opacity: 1;
    transform: scale(1);
}

.emoji-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 8px;
    max-width: 280px;
}

.emoji-option {
    font-size: 20px;
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    text-align: center;
}

.emoji-option:hover {
    background-color: #404040;
}

/* Responsive design for Project modal */
@media (max-width: 768px) {
    .project-modal {
        width: 95%;
        max-height: 85vh;
    }
    
    .project-modal-header {
        padding: 20px 20px 16px 20px;
    }
    
    .project-modal-header h2 {
        font-size: 20px;
    }
    
    .project-modal-content {
        padding: 20px;
    }
    
    .project-categories {
        gap: 8px;
    }
    
    .category-btn {
        padding: 10px 14px;
        font-size: 13px;
    }
    
    .emoji-grid {
        grid-template-columns: repeat(6, 1fr);
        max-width: 200px;
    }
    
    .project-btn {
        width: 100%;
        padding: 14px 24px;
    }
}

/* Instructions Modal */
.instructions-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 20000;
    backdrop-filter: blur(8px);
}

.instructions-modal {
    background-color: #2d2d2d;
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    position: relative;
}

.instructions-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 24px 16px 24px;
    border-bottom: 1px solid #404040;
}

.instructions-modal-header h2 {
    font-size: 24px;
    font-weight: 600;
    color: #FFFFFF;
    margin: 0;
}

.instructions-modal-content {
    padding: 24px;
}

.instructions-description h3 {
    font-size: 18px;
    font-weight: 600;
    color: #FFFFFF;
    margin: 0 0 12px 0;
    line-height: 1.4;
}

.instructions-description p {
    font-size: 14px;
    color: #a0a0a0;
    line-height: 1.5;
    margin: 0 0 24px 0;
}

.instructions-textarea-container {
    margin-bottom: 24px;
}

#instructionsTextarea {
    width: 100%;
    min-height: 200px;
    padding: 16px;
    background-color: #2d2d2d;
    border: 1px solid #404040;
    border-radius: 12px;
    color: #FFFFFF;
    font-size: 14px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.5;
    resize: vertical;
    transition: border-color 0.2s ease;
    box-sizing: border-box;
}

#instructionsTextarea:focus {
    outline: none;
    border-color: #FFFFFF;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.1);
}

#instructionsTextarea::placeholder {
    color: #666666;
    font-style: italic;
}

.instructions-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.instructions-btn {
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    min-width: 80px;
}

.instructions-btn.cancel {
    background-color: transparent;
    color: #a0a0a0;
    border: 1px solid #404040;
}

.instructions-btn.cancel:hover {
    background-color: #404040;
    color: #FFFFFF;
    border-color: #565656;
}

.instructions-btn.save {
    background-color: #FFFFFF;
    color: #1a1a1a;
}

.instructions-btn.save:hover {
    background-color: #e5e5e5;
    transform: translateY(-1px);
}

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

/* Responsive design for Instructions modal */
@media (max-width: 768px) {
    .instructions-modal {
        width: 95%;
        max-height: 85vh;
    }
    
    .instructions-modal-header {
        padding: 20px 20px 16px 20px;
    }
    
    .instructions-modal-header h2 {
        font-size: 20px;
    }
    
    .instructions-modal-content {
        padding: 20px;
    }
    
    .instructions-description h3 {
        font-size: 16px;
    }
    
    #instructionsTextarea {
        min-height: 150px;
        padding: 14px;
    }
    
    .instructions-modal-actions {
        flex-direction: column-reverse;
        gap: 8px;
    }
    
    .instructions-btn {
        width: 100%;
        padding: 14px 24px;
    }
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid #2d2d2d;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.sidebar-logo:hover {
    opacity: 0.8;
}

.logo-icon {
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    color: #FFFFFF;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: #a0a0a0;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-toggle:hover {
    background-color: #2d2d2d;
    color: #FFFFFF;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 16px 0;
}

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

.nav-section:first-child {
    border-bottom: 1px solid #2d2d2d;
    padding-bottom: 16px;
    margin-bottom: 16px;
}

.sidebar.collapsed .nav-section:first-child {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 8px;
}

.section-header {
    padding: 8px 16px;
    margin-bottom: 8px;
}

.section-header span {
    font-size: 12px;
    font-weight: 600;
    color: #a0a0a0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: none;
    border: none;
    color: #a0a0a0;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    border-radius: 0;
}

.nav-item:hover {
    background-color: #2d2d2d;
    color: #FFFFFF;
}

.nav-item svg {
    flex-shrink: 0;
}

.nav-item span {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* History Item Wrapper */
.history-item-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    margin-bottom: 4px;
    border-radius: 6px;
    transition: background-color 0.2s ease;
    min-height: 36px;
}

.history-item-wrapper:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.history-item {
    flex: 1;
    margin-bottom: 0;
    border-radius: 6px 0 0 6px;
    display: flex;
    align-items: center;
    padding: 8px 12px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.history-item-wrapper .history-item {
    border-radius: 6px;
}

.history-menu-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #a0a0a0;
    cursor: pointer;
    padding: 6px;
    border-radius: 4px;
    transition: all 0.2s ease;
    opacity: 0;
    pointer-events: none;
    z-index: 10;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.history-item-wrapper:hover .history-menu-btn {
    opacity: 1;
    pointer-events: auto;
}

.history-menu-btn:hover {
    background-color: #404040;
    color: #FFFFFF;
    transform: translateY(-50%) scale(1.1);
}

.history-menu-btn:active {
    transform: translateY(-50%) scale(0.95);
    background-color: #505050;
}

.sidebar-footer {
    border-top: 1px solid #2d2d2d;
    padding: 16px 0;
}

.user-avatar {
    width: 20px;
    height: 20px;
    background-color: #404040;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* Main Content Wrapper */
.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-left: 260px;
    transition: margin-left 0.3s ease;
    min-height: 100vh;
}

.main-wrapper.sidebar-collapsed {
    margin-left: 48px;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background-color: #1d1d1d;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-btn {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    color: inherit;
    transition: opacity 0.2s ease;
}

.logo-btn:hover {
    opacity: 0.8;
}

.logo {
    font-size: 18px;
    font-weight: 600;
    color: #FFFFFF;
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin: 0;
    line-height: 1;
}

.version {
    font-size: 18px;
    font-weight: 400;
    opacity: 0.7;
    line-height: 1;
    display: inline-flex;
    align-items: baseline;
}

.dropdown-btn, .menu-btn {
    background: none;
    border: none;
    color: #FFFFFF;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dropdown-btn:hover, .menu-btn:hover {
    background-color: #2d2d2d;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0 24px;
    max-width: 768px;
    margin: 0 auto;
    width: 100%;
    border: none !important;
}

.main-content::before,
.main-content::after,
.main-content > *::before,
.main-content > *::after {
    display: none !important;
    content: none !important;
    border: none !important;
}

/* Project Title */
.project-title {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 32px;
}

.folder-icon {
    color: #FFFFFF;
    opacity: 0.9;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 2px; /* 微调，让图标稍微往下一点 */
}

.project-title h2 {
    font-size: 32px;
    font-weight: 500;
    color: #FFFFFF;
}

/* Input Container */
.input-container {
    width: 100%;
    margin-bottom: 32px;
}

/* Input Container in Chat Mode - when chat container is visible and displayed */
body:has(.chat-container[style*="display: flex"]) .input-container {
    margin-bottom: 4px;
}

.input-wrapper {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.chat-input {
    width: 100%;
    padding: 16px 80px 16px 56px;
    background-color: #2d2d2d;
    border: 1px solid #404040;
    border-radius: 24px;
    color: #FFFFFF;
    font-size: 16px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.chat-input::placeholder {
    color: #a0a0a0;
}

.chat-input:focus {
    border-color: #404040;
    box-shadow: none;
}

.plus-btn {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #a0a0a0;
    cursor: pointer;
    padding: 0;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    z-index: 1;
}

.plus-btn:hover {
    color: #FFFFFF;
    background-color: rgba(255, 255, 255, 0.1);
}

.plus-btn:active {
    transform: translateY(-50%) scale(0.95);
}

.input-actions {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    gap: 8px;
}

.send-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    position: relative;
}

/* 未输入状态 - 暗灰色，禁用 */
.send-btn:disabled {
    color: #565656;
    cursor: not-allowed;
    background-color: transparent;
}

/* 有输入内容状态 - 白色背景，黑色箭头 */
.send-btn:not(:disabled) {
    color: #1a1a1a;
    background-color: #FFFFFF;
}

/* 悬浮状态 - 保持白色背景 */
.send-btn:not(:disabled):hover {
    color: #1a1a1a;
    background-color: #e5e5e5;
    transform: scale(1.05);
}

/* 点击状态 */
.send-btn:not(:disabled):active {
    transform: scale(0.95);
    background-color: #d0d0d0;
}

/* Feature Cards */
.feature-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    width: 100%;
    max-width: 600px;
}

.feature-card {
    background-color: transparent;
    border: 1px solid #404040;
    border-radius: 12px;
    padding: 20px;
    transition: background-color 0.2s, border-color 0.2s;
    cursor: pointer;
}

.feature-card:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: #565656;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 500;
    color: #FFFFFF;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: #a0a0a0;
    line-height: 1.4;
}

.instructions-preview {
    margin-top: 12px;
    padding: 12px;
    background-color: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    border: 1px solid #404040;
}

.instructions-content {
    font-size: 14px;
    color: #e0e0e0;
    line-height: 1.4;
    max-height: 60px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

/* Chat History Section */
.chat-history-section {
    width: 100%;
    max-width: 600px;
    margin-top: 32px;
}

.chat-history-section::before,
.chat-history-section::after,
.feature-cards::after,
.feature-cards + *::before {
    display: none !important;
    content: none !important;
    border: none !important;
    height: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
}

.chat-history-item {
    background-color: transparent;
    border: none;
    border-radius: 12px;
    padding: 12px 16px;
    margin-bottom: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.chat-history-item:hover {
    background-color: rgba(255, 255, 255, 0.03);
}

.chat-history-item:hover .chat-history-date {
    opacity: 0;
}

.chat-history-item:hover .chat-history-menu {
    opacity: 1;
    pointer-events: auto;
}

.chat-history-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
}

.chat-history-content {
    flex: 1;
}

.chat-history-title {
    font-size: 12.8px;
    font-weight: 500;
    color: #FFFFFF;
    margin-bottom: 2px;
    line-height: 1.3;
}

.chat-history-preview {
    font-size: 11.2px;
    color: #a0a0a0;
    line-height: 1.4;
    max-height: 32px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.chat-history-meta {
    position: relative;
    display: flex;
    align-items: center;
    min-width: 80px;
    justify-content: flex-end;
}

.chat-history-date {
    font-size: 10.4px;
    color: #666;
    transition: opacity 0.2s ease;
}

.chat-history-menu {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.chat-history-menu-btn {
    background: none;
    border: none;
    color: #a0a0a0;
    cursor: pointer;
    padding: 6px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.chat-history-menu-btn:hover {
    background-color: #404040;
    color: #FFFFFF;
    transform: scale(1.1);
}

.chat-history-menu-btn:active {
    transform: scale(0.95);
    background-color: #505050;
}

/* Chat History Context Menu */
.chat-history-context-menu {
    position: fixed;
    background-color: #2d2d2d;
    border: 1px solid #404040;
    border-radius: 8px;
    padding: 6px 0;
    min-width: 180px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 10000;
    backdrop-filter: blur(8px);
    display: none;
    opacity: 1;
    transform: scale(1);
    transition: all 0.15s ease;
    pointer-events: auto;
}

.chat-history-context-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    color: #FFFFFF;
    font-size: 14px;
}

.chat-history-context-menu-item:hover {
    background-color: #404040;
}

.chat-history-context-menu-item.delete {
    color: #ff6b6b;
}

.chat-history-context-menu-item.delete:hover {
    background-color: rgba(255, 107, 107, 0.1);
}

.chat-history-context-menu-item svg {
    flex-shrink: 0;
    opacity: 0.8;
}

.chat-history-context-menu-item.delete svg {
    color: #ff6b6b;
}

/* Footer */
.footer {
    padding: 20px;
    text-align: center;
}

/* Footer in Chat Mode - when chat container is visible and displayed */
body:has(.chat-container[style*="display: flex"]) .footer {
    padding: 4px 20px;
}

.footer p {
    font-size: 12px;
    color: #707070;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        transform: translateX(-100%);
    }
    
    .sidebar.collapsed {
        width: 100%;
        transform: translateX(-100%);
    }
    
    .sidebar.collapsed .sidebar-header {
        padding: 16px;
        justify-content: space-between;
    }
    
    .sidebar.collapsed .sidebar-logo {
        display: flex;
    }
    
    .sidebar.collapsed .sidebar-toggle {
        opacity: 1;
        pointer-events: auto;
    }
    
    .sidebar.collapsed .sidebar-nav,
    .sidebar.collapsed .sidebar-footer {
        display: none;
    }
    
    .sidebar.open {
        transform: translateX(0);
        width: 100%;
    }
    
    .main-wrapper {
        margin-left: 0;
    }
    
    .main-wrapper.sidebar-collapsed {
        margin-left: 0;
    }
    
    .header {
        padding: 12px 16px;
    }
    
    .main-content {
        padding: 0 16px;
    }
    
    .project-title h2 {
        font-size: 28px;
    }
    
    .project-title {
        margin-bottom: 32px;
    }
    
    .feature-cards {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .feature-card {
        padding: 16px;
    }
    
    .chat-input {
        font-size: 16px; /* Prevent zoom on iOS */
    }
}

@media (max-width: 480px) {
    .project-title {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
    
    .project-title h2 {
        font-size: 24px;
    }
    
    .input-actions {
        right: 8px;
    }
    
    .plus-btn {
        left: 12px;
        width: 20px;
        height: 20px;
    }
}

/* Smooth animations */
* {
    transition: color 0.2s, background-color 0.2s, border-color 0.2s;
}

/* Focus styles for accessibility */
button:focus-visible {
    outline: 2px solid #565656;
    outline-offset: 2px;
}

.chat-input:focus-visible {
    outline: none;
}

/* Chat Container */
.chat-container {
    width: 100%;
    max-width: 768px;
    margin: 0 auto 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 400px;
    position: relative;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-height: 60vh;
    position: relative;
    background-color: #1d1d1d;
    border-radius: 8px;
    
    /* 确保滚动条在最右边 */
    padding-right: 20px;
    margin-right: -20px;
}

/* Message Styles */
.message {
    display: flex;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

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

.message-assistant,
.message-error {
    justify-content: flex-start;
}

.message-content {
    max-width: 80%;
    min-width: 100px;
}

.message-user .message-content {
    background-color: #2f2f2f;
    color: #ffffff;
    border-radius: 18px 18px 4px 18px;
    padding: 12px 16px;
    border: 1px solid #404040;
}

.message-assistant .message-content {
    background-color: transparent;
    color: #ffffff;
    border-radius: 0;
    padding: 0;
    border: none;
}

.message-error .message-content {
    background-color: #ff6b6b;
    color: white;
    border-radius: 18px 18px 18px 4px;
    padding: 12px 16px;
    border: 1px solid #ff5252;
}

.message-text {
    font-size: 16px;
    line-height: 1.4;
    margin-bottom: 8px;
    word-wrap: break-word;
}

.message-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
}

.message-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    opacity: 1;
    transition: opacity 0.2s ease;
}

.action-btn {
    background: none;
    border: none;
    color: #a0a0a0;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.action-btn:hover {
    background-color: #2d2d2d;
    color: #FFFFFF;
}

.action-btn:active {
    transform: scale(0.95);
}

.action-btn.active {
    color: #0084ff;
    background-color: rgba(0, 132, 255, 0.1);
}

.like-btn.active {
    color: #22c55e;
    background-color: rgba(34, 197, 94, 0.1);
}

.dislike-btn.active {
    color: #ef4444;
    background-color: rgba(239, 68, 68, 0.1);
}

.message-time {
    font-size: 11px;
    opacity: 0.7;
    text-align: right;
    flex-shrink: 0;
}

.message-user .message-time {
    color: rgba(255, 255, 255, 0.7);
}

.message-assistant .message-time,
.message-error .message-time {
    color: rgba(255, 255, 255, 0.5);
}

/* Typing Indicator */
.typing-indicator .message-content {
    padding: 16px 20px;
    background-color: transparent;
    border: none;
    border-radius: 0;
}

.typing-animation {
    display: flex;
    align-items: center;
    gap: 4px;
}

.typing-animation span {
    width: 8px;
    height: 8px;
    background-color: #a0a0a0;
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.5;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* Input States */
.chat-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.input-wrapper.sending .chat-input {
    background-color: #363636;
}

/* Modern ChatGPT-style Scrollbar */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: background-color 0.2s ease;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

.chat-messages::-webkit-scrollbar-thumb:active {
    background-color: rgba(255, 255, 255, 0.4);
}

/* 确保滚动条始终可见 */
.chat-messages::-webkit-scrollbar-thumb {
    min-height: 20px;
}

/* Loading animation for future use */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 1.5s infinite;
}

/* File Upload Modal */
.file-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    backdrop-filter: blur(4px);
}

.file-modal {
    background-color: #2d2d2d;
    border-radius: 16px;
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.file-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 32px;
    border-bottom: 1px solid #404040;
}

.file-modal-header h2 {
    font-size: 24px;
    font-weight: 600;
    color: #FFFFFF;
    margin: 0;
}

.file-modal-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.add-files-btn {
    background-color: #FFFFFF;
    color: #1a1a1a;
    border: none;
    border-radius: 8px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.add-files-btn:hover {
    background-color: #e0e0e0;
    transform: translateY(-1px);
}

.close-modal-btn {
    background: none;
    border: none;
    color: #a0a0a0;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-modal-btn:hover {
    background-color: #404040;
    color: #FFFFFF;
}

.file-modal-content {
    padding: 32px;
    min-height: 400px;
    display: flex;
    flex-direction: column;
}

.file-drop-zone {
    border: 2px dashed #565656;
    border-radius: 12px;
    padding: 64px 32px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 300px;
}

.file-drop-zone:hover,
.file-drop-zone.dragover {
    border-color: #FFFFFF;
    background-color: rgba(255, 255, 255, 0.05);
}

.file-drop-icon {
    color: #a0a0a0;
    margin-bottom: 24px;
}

.file-drop-zone:hover .file-drop-icon,
.file-drop-zone.dragover .file-drop-icon {
    color: #FFFFFF;
}

.file-drop-text p {
    font-size: 16px;
    line-height: 1.5;
    color: #a0a0a0;
    margin: 0;
    max-width: 500px;
}

.file-drop-text strong {
    color: #FFFFFF;
    font-weight: 600;
}

/* Files Display */
.files-display {
    margin-top: 16px;
}

.files-count {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.files-text {
    font-size: 14px;
    color: #FFFFFF;
    font-weight: 500;
}

.files-number {
    font-size: 12px;
    color: #a0a0a0;
}

.files-icons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.file-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.file-icon.pdf {
    background-color: #ff4757;
}

.file-icon.doc {
    background-color: #2f5af0;
}

.file-icon.txt {
    background-color: #747d8c;
}

.file-icon.image {
    background-color: #2ed573;
}

.file-icon.code {
    background-color: #ffa502;
}

.file-icon.default {
    background-color: #57606f;
}

.file-icon svg {
    width: 16px;
    height: 16px;
    color: white;
}

.uploaded-files {
    margin-top: 24px;
    border-top: 1px solid #404040;
    padding-top: 24px;
}

.uploaded-file {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

.uploaded-file:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.uploaded-file-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.uploaded-file-info {
    flex: 1;
}

.uploaded-file-name {
    font-size: 14px;
    color: #FFFFFF;
    font-weight: 500;
    margin-bottom: 4px;
}

.uploaded-file-size {
    font-size: 12px;
    color: #a0a0a0;
}

.uploaded-file-remove {
    background: none;
    border: none;
    color: #a0a0a0;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.uploaded-file-remove:hover {
    background-color: #404040;
    color: #ff4757;
}

/* Mobile Responsive for Chat */
@media (max-width: 768px) {
    .chat-container {
        margin: 0 16px 16px;
    }
    
    .chat-messages {
        padding: 16px 0;
        max-height: 50vh;
    }
    
    .message-content {
        max-width: 85%;
    }
    
    .message-text {
        font-size: 15px;
    }
    
    .send-btn {
        width: 28px;
        height: 28px;
        padding: 0;
    }
    
    .file-modal {
        width: 95%;
        max-height: 90vh;
    }
    
    .file-modal-header {
        padding: 16px 20px;
    }
    
    .file-modal-content {
        padding: 20px;
    }
    
    .file-drop-zone {
        padding: 40px 20px;
        min-height: 200px;
    }
}

@media (max-width: 480px) {
    .message-content {
        max-width: 90%;
    }
    
    .message-user .message-content,
    .message-assistant .message-content,
    .message-error .message-content {
        padding: 10px 14px;
    }
}