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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    height: 100vh;
    overflow: hidden;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* 侧边栏 */
.sidebar {
    position: absolute;
    top: 20px;
    left: 28px;
    width: auto;
    background: transparent;
    color: #333333;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 0;
    overflow: visible;
    transition: all 0.3s ease;
    z-index: 100;
}

.sidebar.hidden {
    opacity: 0;
    pointer-events: none;
}



.btn-toggle-sidebar {
    padding: 10px 18px;
    border: none;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
    color: white;
    flex-shrink: 0;
    width: auto;
    height: auto;
}

.btn-toggle-sidebar:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

.btn-back-home {
    padding: 10px 18px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: white;
    border-radius: 12px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    color: #333333;
    flex-shrink: 0;
    width: auto;
    height: auto;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 10px;
}

.btn-back-home:hover {
    background: #f5f5f5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.sidebar-toggle-btn {
    position: fixed;
    left: 28px;
    top: 20px;
    z-index: 999;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
    transition: all 0.3s ease;
    opacity: 0;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
    width: auto;
    height: auto;
}

.sidebar-toggle-btn.visible {
    opacity: 1;
    pointer-events: all;
}

.sidebar-toggle-btn:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.sidebar-title {
    position: fixed;
    left: 50%;
    top: 20px;
    transform: translateX(-50%);
    font-size: 16px;
    font-weight: 600;
    color: #333333;
    letter-spacing: -0.5px;
    margin: 0;
    white-space: nowrap;
    z-index: 101;
    pointer-events: none;
}

.multi-select-controls {
    display: flex;
    gap: 10px;
    flex-direction: column;
    align-items: flex-start;
    flex-shrink: 0;
}

.normal-controls {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    flex-shrink: 0;
}

.btn-multi-select {
    padding: 10px 18px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: white;
    border-radius: 12px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    color: #333333;
    white-space: nowrap;
    flex-shrink: 0;
}

.btn-multi-select:hover {
    background: #f5f5f5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-delete-selected {
    padding: 10px 18px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: white;
    border-radius: 12px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    color: #333333;
    white-space: nowrap;
    flex-shrink: 0;
}

.btn-delete-selected:hover:not(:disabled) {
    background: #f5f5f5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-delete-selected:disabled {
    background: rgba(0, 0, 0, 0.1);
    color: #666666;
    cursor: not-allowed;
    opacity: 0.6;
    box-shadow: none;
}

.btn-create {
    padding: 10px 18px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: white;
    border-radius: 12px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    color: #333333;
    white-space: nowrap;
    flex-shrink: 0;
}

.btn-create:hover {
    background: #f5f5f5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-create-text {
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.btn-create-draw.active,
.btn-create-text.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.btn-create-draw.active:hover,
.btn-create-text.active:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

.page-picker-wrapper {
    position: relative;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: flex-start;
}

.btn-group-create {
    display: flex;
    align-items: center;
    gap: 4px;
}

.btn-add-page {
    padding: 10px 18px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: white;
    border-radius: 12px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    color: #333333;
    width: auto;
    height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.btn-add-page:hover {
    background: #f5f5f5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.page-list-panel {
    position: absolute;
    top: 0;
    left: 100%;
    margin-left: 8px;
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 12px;
    padding: 8px;
    display: none;
    flex-direction: column;
    gap: 4px;
    max-height: 300px;
    overflow-y: auto;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    min-width: 150px;
}

.page-list-panel.open {
    display: flex;
}

.page-list-item {
    display: flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    gap: 6px;
    background: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.05);
    white-space: nowrap;
}

.page-list-item:hover {
    background: #f5f5f5;
    transform: translateX(2px);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.page-list-item.active {
    background: #f5f5f5;
    color: #333333;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.1);
}

.page-list-item.selected {
    background: #f5f5f5;
    border-color: rgba(0, 0, 0, 0.1);
}

.page-list-item.active .page-name {
    color: #333333;
    font-weight: 600;
}

.page-list-item .btn-icon-small {
    background: rgba(0, 0, 0, 0.05);
    border: none;
    color: #666666;
    cursor: pointer;
    padding: 4px 6px;
    font-size: 12px;
    opacity: 1;
    transition: all 0.3s ease;
    border-radius: 6px;
    width: auto;
    height: auto;
    flex-shrink: 0;
    margin-left: auto;
}

.page-list-item:hover .btn-icon-small {
    background: rgba(0, 0, 0, 0.1);
    transform: scale(1.1);
}

.page-list-item.active .btn-icon-small {
    background: rgba(0, 0, 0, 0.05);
    color: #666666;
}

.page-list-item .page-name {
    flex: 1;
    font-size: 11px;
    font-weight: 500;
    user-select: none;
    cursor: pointer;
}

.empty-page-item {
    padding: 8px 10px;
    text-align: center;
    color: #999999;
    font-size: 11px;
    white-space: nowrap;
}

.btn-create-text:hover {
    background: #f5f5f5;
}

.btn-create-draw {
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.btn-create-draw:hover {
    background: #f5f5f5;
}


.edit-input {
    flex: 1;
    background-color: #ffffff;
    border: 2px solid #667eea;
    color: #333333;
    padding: 8px 12px;
    border-radius: 10px;
    font-size: 14px;
    outline: none;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}


.page-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    cursor: pointer;
    width: 100%;
    justify-content: space-between;
}

.page-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #667eea;
    border-radius: 6px;
    order: 2;
    flex-shrink: 0;
}

.page-checkbox .page-name {
    flex: 1;
    cursor: pointer;
    font-weight: 500;
    order: 1;
}

.page-name {
    flex: 1;
    font-size: 13px;
    font-weight: 500;
    user-select: none;
}

.btn-icon-small {
    background: rgba(0, 0, 0, 0.05);
    border: none;
    color: #666666;
    cursor: pointer;
    padding: 6px;
    font-size: 13px;
    opacity: 0;
    transition: all 0.3s ease;
    border-radius: 8px;
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 编辑器 */
.editor {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    overflow: hidden;
}

.editor.empty {
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.empty-editor {
    text-align: center;
    color: #666666;
    padding: 40px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.empty-editor h2 {
    font-size: 24px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.empty-editor p {
    color: #999999;
    font-size: 15px;
}

.editor-toolbar-buttons {
    position: absolute;
    top: 20px;
    right: 28px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
    z-index: 100;
    opacity: 1;
    pointer-events: all;
}

.editor-toolbar-buttons.hidden {
    opacity: 0;
    pointer-events: none;
}

.editor-title {
    flex: 1;
    font-size: 20px;
    font-weight: 700;
    border: none;
    outline: none;
    background: transparent;
    color: #333333;
    letter-spacing: -0.5px;
    margin-left: 32px;
}

.toolbar {
    display: flex;
    gap: 10px;
    align-items: center;
}

.toolbar-btn {
    padding: 10px 18px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: white;
    border-radius: 12px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    color: #333333;
}

.toolbar-btn:hover {
    background: linear-gradient(135deg, #f5f7fa 0%, #ffffff 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.toolbar-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.color-picker-wrapper {
    position: relative;
}

.color-trigger {
    display: flex;
    align-items: center;
    gap: 8px;
}

.color-presets-panel {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 12px;
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 16px;
    padding: 12px;
    display: none;
    flex-wrap: wrap;
    gap: 10px;
    width: 200px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    z-index: 100;
    backdrop-filter: blur(10px);
}

.color-presets-panel.open {
    display: flex;
}

.color-btn {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    cursor: pointer;
    padding: 0;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.color-btn:hover {
    transform: scale(1.15) rotate(5deg);
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

/* 选择工具颜色面板 */
.selection-color-picker-wrapper {
    position: relative;
}

.selection-color-presets-panel {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 12px;
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 16px;
    padding: 12px;
    display: none;
    flex-wrap: wrap;
    gap: 10px;
    width: 200px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    z-index: 100;
    backdrop-filter: blur(10px);
}

.selection-color-presets-panel.open {
    display: flex;
}

.color-btn.active {
    border-color: #667eea;
    border-width: 4px;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2), 0 4px 12px rgba(102, 126, 234, 0.3);
    transform: scale(1.1);
}

.size-picker-wrapper {
    position: relative;
}

.size-trigger {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    padding: 10px 18px;
    min-width: 56px;
    width: 56px;
    box-sizing: border-box;
}

.size-preview-dot {
    display: inline-block;
    background-color: #000000;
    border-radius: 50%;
    flex-shrink: 0;
}

.size-presets-panel {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 12px;
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 16px;
    padding: 12px;
    display: none;
    flex-wrap: wrap;
    gap: 10px;
    width: auto;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    z-index: 100;
    backdrop-filter: blur(10px);
}

.size-presets-panel.open {
    display: flex;
}

.size-option-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    background: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.size-option-btn:hover {
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
    transform: scale(1.1);
}

.size-option-btn.active {
    border-color: #667eea;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.size-dot {
    display: inline-block;
    background-color: #000000;
    border-radius: 50%;
    flex-shrink: 0;
}

.size-option-btn.active .size-dot {
    background-color: #ffffff;
}

.align-picker-wrapper {
    position: relative;
}

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

.align-presets-panel {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 12px;
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 16px;
    padding: 12px;
    display: none;
    flex-direction: row;
    gap: 10px;
    width: auto;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    z-index: 100;
    backdrop-filter: blur(10px);
}

.align-presets-panel.open {
    display: flex;
}

.align-option-btn {
    padding: 0;
    width: 40px;
    height: 40px;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    background: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.align-option-btn:hover {
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
    transform: scale(1.1);
    background: linear-gradient(135deg, #f5f7fa 0%, #ffffff 100%);
}

.align-option-btn.active {
    border-color: #667eea;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

/* OneNote 风格的对齐图标 */
.align-icon {
    display: inline-block;
    width: 20px;
    height: 18px;
    position: relative;
    vertical-align: middle;
}

/* 左对齐图标 - 三条左对齐的横线（长度递减） */
.align-icon-left {
    background: linear-gradient(to right, 
        currentColor 0%, 
        currentColor 18px, 
        transparent 18px
    );
    background-size: 20px 2px;
    background-position: 0 3px;
    background-repeat: no-repeat;
}

.align-icon-left::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 14px;
    height: 2px;
    background-color: currentColor;
    border-radius: 1px;
}

.align-icon-left::after {
    content: '';
    position: absolute;
    left: 0;
    top: 15px;
    width: 10px;
    height: 2px;
    background-color: currentColor;
    border-radius: 1px;
}

/* 居中图标 - 三条居中对齐的横线（长度递减） */
.align-icon-center {
    background: linear-gradient(to right, 
        transparent 0%, 
        transparent 1px,
        currentColor 1px, 
        currentColor 19px,
        transparent 19px
    );
    background-size: 20px 2px;
    background-position: 0 3px;
    background-repeat: no-repeat;
}

.align-icon-center::before {
    content: '';
    position: absolute;
    left: 3px;
    top: 9px;
    width: 14px;
    height: 2px;
    background-color: currentColor;
    border-radius: 1px;
}

.align-icon-center::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 15px;
    width: 10px;
    height: 2px;
    background-color: currentColor;
    border-radius: 1px;
}

/* 右对齐图标 - 三条右对齐的横线（长度递减） */
.align-icon-right {
    background: linear-gradient(to right, 
        transparent 0%, 
        transparent 2px,
        currentColor 2px, 
        currentColor 20px
    );
    background-size: 20px 2px;
    background-position: 0 3px;
    background-repeat: no-repeat;
}

.align-icon-right::before {
    content: '';
    position: absolute;
    right: 0;
    top: 9px;
    width: 14px;
    height: 2px;
    background-color: currentColor;
    border-radius: 1px;
}

.align-icon-right::after {
    content: '';
    position: absolute;
    right: 0;
    top: 15px;
    width: 10px;
    height: 2px;
    background-color: currentColor;
    border-radius: 1px;
}

/* 激活状态下的图标颜色 */
.align-option-btn.active .align-icon-left,
.align-option-btn.active .align-icon-center,
.align-option-btn.active .align-icon-right {
    background-image: linear-gradient(to right, 
        white 0%, 
        white 18px, 
        transparent 18px
    );
}

.align-option-btn.active .align-icon-center {
    background-image: linear-gradient(to right, 
        transparent 0%, 
        transparent 1px,
        white 1px, 
        white 19px,
        transparent 19px
    );
}

.align-option-btn.active .align-icon-right {
    background-image: linear-gradient(to right, 
        transparent 0%, 
        transparent 2px,
        white 2px, 
        white 20px
    );
}

.align-option-btn.active .align-icon::before,
.align-option-btn.active .align-icon::after {
    background-color: white;
}

.editor-content {
    flex: 1;
    overflow: hidden;
    position: relative;
    background: linear-gradient(135deg, #fafafa 0%, #ffffff 100%);
    transition: all 0.3s ease;
}

/* 绘图页面时，允许画布溢出显示 */
.editor-content.canvas-mode {
    overflow: visible;
}


#canvas {
    display: block;
    background: white;
    cursor: crosshair;
    touch-action: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    position: absolute;
    top: 0;
    left: 0;
    /* 画布尺寸由JavaScript动态设置 */
}


#crosshair {
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: white;
    border: 1px solid black;
    pointer-events: none;
    z-index: 10;
    transform: translate(-50%, -50%);
}

#eraser-trail {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9;
}

.text-editor-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: white;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.text-editor {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    padding: 80px 200px 32px 180px;
    font-size: 16px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    line-height: 1.8;
    resize: none;
    background: transparent;
    color: #333333;
    box-sizing: border-box;
    position: relative;
    z-index: 1;
    overflow-y: auto;
    overflow-x: hidden;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.text-editor:empty:before {
    content: attr(data-placeholder);
    color: #bbbbbb;
    font-style: italic;
    pointer-events: none;
}


/* 移动端适配 */
@media (max-width: 768px) {
    /* 基础布局调整 */
    body {
        overflow: hidden;
        -webkit-overflow-scrolling: touch;
        touch-action: pan-y;
    }

    /* 防止移动端双击缩放 */
    * {
        -webkit-tap-highlight-color: transparent;
        -webkit-touch-callout: none;
    }

    /* 按钮触摸反馈优化 */
    button {
        -webkit-tap-highlight-color: rgba(102, 126, 234, 0.2);
        touch-action: manipulation;
    }

    .app {
        position: relative;
    }

    /* 侧边栏移动端样式 - 改为抽屉式 */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 280px;
        max-width: 85vw;
        height: 100vh;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        box-shadow: 2px 0 20px rgba(0, 0, 0, 0.15);
        padding: 20px 16px;
        padding-bottom: 80px; /* 为底部按钮留出空间 */
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 1000;
        overflow-y: auto;
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
    }

    .sidebar:not(.hidden) {
        transform: translateX(0);
    }

    .sidebar.hidden {
        transform: translateX(-100%);
        opacity: 1;
        pointer-events: none;
    }

    /* 侧边栏遮罩层 */
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
    }

    .sidebar-overlay.visible {
        opacity: 1;
        pointer-events: all;
    }

    /* 侧边栏标题调整 */
    .sidebar-title {
        position: relative;
        left: auto;
        top: auto;
        transform: none;
        font-size: 18px;
        margin-bottom: 20px;
        padding-bottom: 12px;
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
        pointer-events: all;
    }

    /* 侧边栏按钮调整 */
    .btn-back-home {
        padding: 12px 20px;
        font-size: 14px;
        min-width: 44px;
        min-height: 44px;
        margin-top: 10px;
    }

    .btn-toggle-sidebar {
        position: absolute;
        top: 20px;
        right: 16px;
        padding: 12px;
        font-size: 16px;
        min-width: 44px;
        min-height: 44px;
    }

    .sidebar-toggle-btn {
        position: fixed;
        left: 16px;
        top: 16px;
        padding: 12px;
        font-size: 18px;
        min-width: 44px;
        min-height: 44px;
        z-index: 1001;
    }

    /* 按钮增大触摸目标 */
    .btn-back-home,
    .btn-create,
    .btn-add-page,
    .btn-multi-select,
    .btn-delete-selected {
        padding: 12px 20px;
        font-size: 14px;
        min-height: 44px;
        min-width: 44px;
    }

    /* 页面列表面板调整 */
    .page-list-panel {
        position: static;
        margin-left: 0;
        margin-top: 8px;
        max-height: 200px;
        width: 100%;
        min-width: auto;
    }

    /* 页面列表项调整 */
    .page-list-item {
        padding: 10px 12px;
        min-height: 44px;
    }

    .page-list-item .page-name {
        font-size: 14px;
    }

    .btn-icon-small {
        width: 36px;
        height: 36px;
        min-width: 36px;
        min-height: 36px;
        padding: 8px;
        font-size: 16px;
        opacity: 1;
    }

    /* 编辑器调整 */
    .editor {
        width: 100%;
        margin-left: 0;
    }

    .editor-title {
        font-size: 18px;
        margin-left: 16px;
        padding: 12px 0;
    }

    /* 工具栏移动端样式 */
    .editor-toolbar-buttons {
        position: fixed;
        top: auto;
        bottom: 20px;
        right: 50%;
        transform: translateX(50%);
        left: auto;
        flex-wrap: wrap;
        gap: 8px;
        max-width: calc(100vw - 32px);
        justify-content: center;
    }

    .toolbar-btn {
        padding: 12px 16px;
        font-size: 14px;
        min-height: 44px;
        min-width: 44px;
    }

    /* 浮动工具栏调整 */
    .floating-toolbar {
        top: auto;
        bottom: 80px;
        left: 50%;
        transform: translateX(-50%);
        max-width: calc(100vw - 32px);
    }

    .floating-toolbar-content {
        padding: 10px 16px;
        gap: 8px;
    }

    .floating-toolbar .toolbar-btn {
        padding: 10px 14px;
        font-size: 13px;
        min-height: 40px;
    }

    .floating-toolbar-toggle {
        top: auto;
        bottom: 20px;
        right: 16px;
        min-width: 44px;
        min-height: 44px;
    }

    /* 颜色/大小/对齐面板调整 */
    .color-presets-panel,
    .size-presets-panel,
    .align-presets-panel {
        position: fixed;
        bottom: 120px;
        left: 50%;
        transform: translateX(-50%);
        top: auto;
        margin-top: 0;
        margin-bottom: 12px;
        max-width: calc(100vw - 32px);
    }

    .color-btn {
        width: 40px;
        height: 40px;
        min-width: 40px;
        min-height: 40px;
    }

    .size-option-btn,
    .align-option-btn {
        width: 44px;
        height: 44px;
        min-width: 44px;
        min-height: 44px;
    }

    /* 查找面板调整 */
    .find-panel {
        position: fixed;
        top: 70px;
        right: 16px;
        left: 16px;
        max-width: calc(100vw - 32px);
        flex-wrap: wrap;
    }

    .find-input {
        flex: 1;
        min-width: 150px;
        min-height: 44px;
    }

    .find-btn {
        min-width: 44px;
        min-height: 44px;
    }

    /* 文本编辑器移动端优化 */
    .text-editor {
        padding: 20px 16px 32px 16px;
        font-size: 16px;
        -webkit-text-size-adjust: 100%;
    }
    
    .text-editor-lines {
        padding: 20px 16px 32px 16px;
        font-size: 16px;
    }

    /* 画布移动端优化 */
    #canvas {
        touch-action: none;
        -ms-touch-action: none;
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        user-select: none;
    }

    .editor-content.canvas-mode {
        overflow: auto;
        -webkit-overflow-scrolling: touch;
        touch-action: pan-x pan-y pinch-zoom;
    }

    /* 文本编辑器移动端优化 */
    .text-editor-wrapper {
        touch-action: pan-y;
    }

    /* 空编辑器提示调整 */
    .empty-editor {
        padding: 30px 20px;
        margin: 20px;
    }

    .empty-editor h2 {
        font-size: 20px;
    }

    .empty-editor p {
        font-size: 14px;
    }

    /* 多选控制按钮组调整 */
    .multi-select-controls,
    .normal-controls {
        width: 100%;
    }

    .multi-select-controls {
        flex-direction: row;
        gap: 8px;
    }

    .btn-delete-selected {
        flex: 1;
    }

    /* 页面选择器包装器调整 */
    .page-picker-wrapper {
        width: 100%;
    }

    .btn-group-create {
        width: 100%;
    }

    .btn-create {
        flex: 1;
    }

    .btn-add-page {
        width: 100%;
        margin-top: 4px;
    }
}

/* 小屏幕手机优化 */
@media (max-width: 480px) {
    .sidebar {
        width: 100vw;
        max-width: 100vw;
    }

    .toolbar-btn {
        padding: 10px 12px;
        font-size: 13px;
    }

    .floating-toolbar-content {
        padding: 8px 12px;
    }

    .color-presets-panel,
    .size-presets-panel,
    .align-presets-panel {
        width: calc(100vw - 24px);
        padding: 10px;
    }

    .text-editor {
        padding: 16px 12px 24px 12px;
        font-size: 15px;
    }

    .text-editor-lines {
        padding: 16px 12px 24px 12px;
        font-size: 15px;
    }
}

.text-editor-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    padding: 80px 200px 32px 180px;
    box-sizing: border-box;
    font-size: 16px;
    line-height: 1.8;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    overflow: hidden;
}

.text-editor-line {
    height: 1.8em;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    display: block;
}

.text-editor::placeholder {
    color: #bbbbbb;
    font-style: italic;
}

/* 文本高亮样式 - 方案1：黄色背景（推荐，保持字符间距） */
.text-editor .text-highlight {
    background-color: #ffeb3b; /* 黄色背景 */
    color: #333333; /* 保持原文字颜色 */
    padding: 2px 0; /* 只设置上下内边距，左右不设置，保持字符间距 */
    border-radius: 2px; /* 圆角 */
    display: inline; /* 确保是行内元素 */
    box-decoration-break: clone; /* 确保每行独立渲染，保持视觉效果 */
    -webkit-box-decoration-break: clone; /* WebKit浏览器支持 */
}

/* 其他可选方案（取消注释使用） */

/* 方案2：下划线高亮
.text-editor .text-highlight {
    text-decoration: underline;
    text-decoration-color: #ff6b35;
    text-decoration-thickness: 3px;
    text-underline-offset: 3px;
    color: #333333;
}
*/

/* 方案3：背景色+文字颜色
.text-editor .text-highlight {
    background-color: #fff3cd;
    color: #856404;
    padding: 2px 1px;
}
*/

/* 方案4：边框底部
.text-editor .text-highlight {
    border-bottom: 3px solid #ff6b35;
    padding-bottom: 1px;
    color: #333333;
}
*/

/* 方案5：文字颜色（原方案，可能间距较窄）
.text-editor .text-highlight {
    color: #ff6b35;
    font-weight: 500;
    background-color: transparent;
}
*/

.sidebar-content::-webkit-scrollbar {
    width: 8px;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: #f5f5f5;
    border-radius: 4px;
}


/* 浮动工具栏 */

.floating-toolbar {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1001;
    opacity: 1;
    pointer-events: all;
    transition: all 0.3s ease;
    max-width: 90vw;
    overflow-x: auto;
}

.floating-toolbar.visible {
    opacity: 1;
    pointer-events: all;
}

.floating-toolbar.hidden {
    opacity: 0;
    pointer-events: none;
}

.floating-toolbar-content {
    display: flex;
    gap: 10px;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: 12px 20px;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    flex-wrap: wrap;
    justify-content: center;
}

.floating-toolbar-toggle {
    position: absolute;
    top: 20px;
    right: 28px;
    z-index: 1002;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

.floating-toolbar-toggle.visible {
    opacity: 1;
    pointer-events: all;
}

.floating-toolbar .toolbar-btn {
    padding: 8px 16px;
    font-size: 12px;
}

.floating-toolbar .size-presets-panel {
    width: auto;
    padding: 10px;
    gap: 8px;
}

.floating-toolbar .size-option-btn {
    width: 36px;
    height: 36px;
}

.btn-hide-toolbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
}

.btn-hide-toolbar:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

.btn-toggle-toolbar {
    padding: 10px 18px !important;
    min-width: auto;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    font-size: 13px;
    font-weight: 600;
}

.btn-toggle-toolbar:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* 查找面板 */
.find-panel {
    position: absolute;
    top: 70px;
    right: 28px;
    display: none;
    align-items: center;
    gap: 8px;
    background: white;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    padding: 10px 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    z-index: 101;
    backdrop-filter: blur(10px);
}

.find-panel.open {
    display: flex;
}

.find-input {
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 14px;
    outline: none;
    min-width: 200px;
    transition: all 0.3s ease;
}

.find-input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.find-btn {
    padding: 8px 12px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    color: #333333;
    min-width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.find-btn:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.find-close {
    font-size: 16px;
    font-weight: bold;
}

.find-results {
    font-size: 12px;
    color: #666666;
    margin-left: 4px;
    white-space: nowrap;
}

/* Toast提示消息动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 撤销/重做按钮 */
.undo-redo-controls {
    position: fixed;
    bottom: 20px;
    left: 28px;
    display: flex;
    gap: 0;
    z-index: 100;
    background: rgba(240, 240, 240, 0.9);
    border-radius: 8px;
    padding: 4px;
    backdrop-filter: blur(10px);
}

.undo-redo-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease;
    color: #666666;
    padding: 0;
}

.undo-redo-btn:hover:not(:disabled) {
    background: rgba(220, 220, 220, 0.8);
}

.undo-redo-btn:active:not(:disabled) {
    background: rgba(200, 200, 200, 0.8);
}

.undo-redo-btn:disabled {
    cursor: not-allowed;
    opacity: 0.4;
}

.undo-redo-btn svg {
    width: 20px;
    height: 20px;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .undo-redo-controls {
        bottom: 20px;
        left: 16px;
        padding: 3px;
    }
    
    .undo-redo-btn {
        width: 36px;
        height: 36px;
    }
    
    .undo-redo-btn svg {
        width: 18px;
        height: 18px;
    }
}