/**
 * style.css - 函数教学工具样式表
 * 教育类清新风格（蓝青色调）
 * 支持响应式设计和暗色模式
 * 所有类名与 index.html 完全匹配
 */

/* ============================================================
   CSS 变量与主题
   ============================================================ */

:root {
    /* 主色调：蓝青系 */
    --primary-color: #3498db;
    --primary-light: #5dade2;
    --primary-dark: #2980b9;
    --primary-rgb: 52, 152, 219;

    /* 辅助色：青色 */
    --secondary-color: #1abc9c;
    --secondary-light: #48c9b0;
    --secondary-dark: #16a085;
    --secondary-rgb: 26, 188, 156;

    /* 背景色 */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef2f7;
    --bg-hover: #e8f0fe;

    /* 文字颜色 */
    --text-primary: #2c3e50;
    --text-secondary: #5d6d7e;
    --text-muted: #95a5a6;
    --text-inverse: #ffffff;

    /* 边框色 */
    --border-color: #dce3ec;
    --border-light: #eef2f7;

    /* 功能色 */
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --error-color: #e74c3c;
    --info-color: #3498db;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-primary: 0 4px 12px rgba(52, 152, 219, 0.3);

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* 间距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 32px;

    /* 字体 */
    --font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    --font-mono: "Consolas", "Monaco", "Courier New", monospace;

    /* 尺寸 */
    --header-height: 56px;
    --right-panel-width: 300px;
    --left-toolbar-width: 70px;

    /* 过渡动画 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
}

/* 暗色模式变量 */
[data-theme="dark"] {
    --bg-primary: #1a1d23;
    --bg-secondary: #242830;
    --bg-tertiary: #2d3139;
    --bg-hover: #343842;

    --text-primary: #e8eaed;
    --text-secondary: #b0b5bd;
    --text-muted: #7c828c;

    --border-color: #3a3f48;
    --border-light: #30343c;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* ============================================================
   基础重置
   ============================================================ */

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

html {
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
    background: none;
    color: inherit;
}

input,
select,
textarea {
    font-family: inherit;
    outline: none;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ============================================================
   顶部导航栏 .app-header
   ============================================================ */

.app-header {
    height: var(--header-height);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-lg);
    box-shadow: var(--shadow-sm);
    position: relative;
    z-index: 100;
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    user-select: none;
}

.logo-icon {
    font-size: 24px;
    line-height: 1;
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 主导航 */
.main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.nav-btn {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-btn:hover {
    color: var(--primary-color);
    background-color: var(--bg-hover);
}

.nav-btn.active {
    color: var(--primary-color);
    background-color: rgba(var(--primary-rgb), 0.1);
}

.nav-btn.active::after {
    content: '';
    position: absolute;
    bottom: -14px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px 2px 0 0;
}

/* 图标按钮 */
.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background-color: var(--bg-hover);
    color: var(--primary-color);
}

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

/* 用户按钮 */
.user-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md) var(--space-xs) var(--space-xs);
    border-radius: 20px;
    background-color: var(--bg-tertiary);
    transition: all var(--transition-fast);
}

.user-btn:hover {
    background-color: var(--bg-hover);
}

.user-btn .avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.user-btn .username {
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
}

/* ============================================================
   主内容区 .app-main
   ============================================================ */

.app-main {
    display: flex;
    height: calc(100vh - var(--header-height));
    width: 100%;
    overflow: hidden;
}

/* ============================================================
   左侧工具栏 .left-toolbar
   ============================================================ */

.left-toolbar {
    width: var(--left-toolbar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
    z-index: 10;
    overflow-y: auto;
    overflow-x: hidden;
}

.toolbar-section {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--border-light);
}

.toolbar-section:last-child {
    border-bottom: none;
}

.toolbar-bottom {
    margin-top: auto;
    border-top: 1px solid var(--border-light);
    border-bottom: none;
}

.toolbar-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: var(--space-sm) var(--space-md);
    text-align: center;
}

.tool-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 0 var(--space-xs);
}

.tool-btn {
    width: 54px;
    padding: var(--space-sm) var(--space-xs);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    position: relative;
}

.tool-btn:hover {
    background-color: var(--bg-hover);
    color: var(--primary-color);
}

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

.tool-btn.active {
    background-color: rgba(var(--primary-rgb), 0.12);
    color: var(--primary-color);
}

.tool-btn.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 28px;
    background-color: var(--primary-color);
    border-radius: 0 2px 2px 0;
}

.tool-icon {
    font-size: 20px;
    line-height: 1;
}

.tool-label {
    font-size: 10px;
    font-weight: 500;
    white-space: nowrap;
}

/* ============================================================
   中央画布区 .canvas-area
   ============================================================ */

.canvas-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative;
    background-color: var(--bg-primary);
}

/* 画布工具栏 */
.canvas-toolbar {
    height: 44px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-md);
    gap: var(--space-md);
    flex-shrink: 0;
}

.canvas-zoom {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 2px;
}

.zoom-btn {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: bold;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.zoom-btn:hover {
    background-color: var(--bg-hover);
    color: var(--primary-color);
}

.zoom-level {
    font-size: 12px;
    font-family: var(--font-mono);
    color: var(--text-primary);
    min-width: 48px;
    text-align: center;
    font-weight: 500;
}

.canvas-coord-display {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-secondary);
    padding: var(--space-xs) var(--space-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    min-width: 140px;
    text-align: center;
}

.canvas-actions {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.text-btn {
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.text-btn:hover {
    background-color: var(--bg-hover);
    color: var(--primary-color);
}

.text-btn.active {
    color: var(--primary-color);
    background-color: rgba(var(--primary-rgb), 0.1);
}

/* 画布容器 */
.canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--bg-primary);
}

.canvas-container canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: grab;
}

.canvas-container canvas:active {
    cursor: grabbing;
}

.canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
}

.canvas-overlay > * {
    pointer-events: auto;
}

/* ============================================================
   右侧面板 .right-panel
   ============================================================ */

.right-panel {
    width: var(--right-panel-width);
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    box-shadow: -2px 0 8px rgba(0, 0, 0, 0.04);
    z-index: 10;
    overflow: hidden;
}

/* 标签切换 */
.panel-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    padding: 0 var(--space-xs);
}

.panel-tab {
    flex: 1;
    padding: var(--space-md) var(--space-xs);
    text-align: center;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    user-select: none;
}

.panel-tab:hover {
    color: var(--primary-color);
}

.panel-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* 面板内容 */
.panel-content {
    flex: 1;
    overflow-y: auto;
    display: none;
}

.panel-content.active {
    display: block;
}

.panel-section {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-light);
}

.panel-section:last-child {
    border-bottom: none;
}

.section-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.section-title::before {
    content: '';
    width: 3px;
    height: 14px;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* 按钮通用样式 */
.primary-btn,
.secondary-btn {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    white-space: nowrap;
    border: 1px solid transparent;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--text-inverse);
    box-shadow: var(--shadow-primary);
}

.primary-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(var(--primary-rgb), 0.4);
}

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

.secondary-btn {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.secondary-btn:hover {
    background-color: var(--bg-hover);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.full-width {
    width: 100%;
}

.flex-1 {
    flex: 1;
}

/* ============================================================
   预设函数网格 .preset-grid
   ============================================================ */

.preset-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
}

.preset-btn {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    font-weight: 500;
}

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

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

/* ============================================================
   函数列表 .function-list
   ============================================================ */

.function-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.function-item {
    display: flex;
    align-items: center;
    padding: var(--space-md);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    gap: var(--space-sm);
}

.function-item:hover {
    border-color: var(--primary-color);
    background-color: var(--bg-hover);
}

.function-item.selected {
    border-color: var(--primary-color);
    background-color: rgba(var(--primary-rgb), 0.08);
    box-shadow: 0 0 0 2px rgba(var(--primary-rgb), 0.1);
}

.func-color {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    flex-shrink: 0;
    cursor: pointer;
    transition: transform var(--transition-fast);
    border: 2px solid var(--bg-secondary);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.func-color:hover {
    transform: scale(1.2);
}

.func-info {
    flex: 1;
    min-width: 0;
}

.func-expr {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.func-type {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}

.func-toggle,
.func-delete {
    width: 26px;
    height: 26px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.func-toggle:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary-color);
}

.func-toggle.hidden {
    color: var(--text-muted);
    opacity: 0.5;
}

.func-delete:hover {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--error-color);
}

/* ============================================================
   对象列表 .object-list
   ============================================================ */

.object-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.object-item {
    display: flex;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    gap: var(--space-sm);
}

.object-item:hover {
    background-color: var(--bg-hover);
}

.object-item.selected {
    background-color: rgba(var(--primary-rgb), 0.08);
}

.obj-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
    background-color: var(--primary-color);
}

.obj-name {
    flex: 1;
    font-size: 13px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.obj-type-label {
    font-size: 11px;
    color: var(--text-muted);
    padding: 2px 6px;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.obj-visibility {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.obj-visibility:hover {
    background-color: var(--bg-tertiary);
}

.obj-visibility.hidden {
    color: var(--text-muted);
    opacity: 0.5;
}

/* 空状态提示 */
.empty-hint {
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    color: var(--text-muted);
    font-size: 13px;
}

/* ============================================================
   动画控制 .anim-control 等
   ============================================================ */

.anim-control {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.anim-select {
    flex: 1;
    height: 36px;
    padding: 0 var(--space-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 13px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.anim-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

.anim-buttons {
    display: flex;
    gap: 2px;
}

.anim-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--text-secondary);
    background-color: var(--bg-tertiary);
    transition: all var(--transition-fast);
}

.anim-btn:hover {
    background-color: var(--bg-hover);
    color: var(--primary-color);
}

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

.anim-btn.playing {
    color: var(--primary-color);
    background-color: rgba(var(--primary-rgb), 0.15);
}

/* 速度滑块行 */
.anim-slider-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.slider-label {
    font-size: 13px;
    color: var(--text-secondary);
    min-width: 36px;
    flex-shrink: 0;
}

.anim-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
    cursor: pointer;
}

.anim-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 3px solid var(--bg-secondary);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-fast);
}

.anim-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.4);
}

.anim-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 3px solid var(--bg-secondary);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

.slider-value {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--primary-color);
    font-weight: 600;
    min-width: 40px;
    text-align: right;
    flex-shrink: 0;
}

/* 动画选项 */
.anim-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.checkbox-label:hover {
    color: var(--text-primary);
}

/* 参数动画控制 */
.param-anim-control {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

/* ============================================================
   变换网格 .transform-grid
   ============================================================ */

.transform-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
}

.transform-btn {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    font-weight: 500;
}

.transform-btn:hover {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
    background-color: rgba(var(--secondary-rgb), 0.08);
    transform: translateY(-1px);
}

.transform-btn.active {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
    background-color: rgba(var(--secondary-rgb), 0.12);
}

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

/* 属性表单 */
.prop-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.prop-form .form-group {
    margin-bottom: 0;
}

/* ============================================================
   右键菜单 .context-menu
   ============================================================ */

.context-menu {
    position: fixed;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 4px;
    z-index: 2000;
    min-width: 160px;
    animation: fadeIn 0.15s ease;
}

.context-menu-item {
    padding: 8px 14px;
    font-size: 13px;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    user-select: none;
}

.context-menu-item:hover {
    background-color: var(--bg-hover);
    color: var(--primary-color);
}

.context-menu-item.danger {
    color: var(--error-color);
}

.context-menu-item.danger:hover {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--error-color);
}

.context-menu-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 4px 0;
}

/* ============================================================
   模态框 .modal
   ============================================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    animation: fadeIn var(--transition-normal);
}

.modal-content {
    position: relative;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    max-width: 440px;
    width: 90%;
    max-height: 85vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalIn var(--transition-normal);
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    z-index: 1;
}

.modal-close:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-header {
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-xl);
    overflow-y: auto;
    flex: 1;
}

/* 认证标签页 */
.auth-tabs {
    display: flex;
    margin-bottom: var(--space-xl);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 4px;
}

.auth-tab {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    text-align: center;
}

.auth-tab:hover {
    color: var(--text-primary);
}

.auth-tab.active {
    background-color: var(--bg-secondary);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

/* 表单 */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group select {
    height: 40px;
    padding: 0 var(--space-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-group .checkbox-label {
    flex-direction: row;
}

.auth-tip {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    min-height: 18px;
}

.auth-tip.error {
    color: var(--error-color);
}

.auth-tip.success {
    color: var(--success-color);
}

/* ============================================================
   Toast 提示 .toast-container / .toast
   ============================================================ */

.toast-container {
    position: fixed;
    top: calc(var(--header-height) + var(--space-md));
    right: var(--space-lg);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    pointer-events: none;
}

.toast {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    min-width: 200px;
    max-width: 360px;
    pointer-events: auto;
    animation: toastIn 0.3s ease;
    backdrop-filter: blur(8px);
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.toast-success {
    background-color: rgba(46, 204, 113, 0.95);
    color: white;
}

.toast.toast-error {
    background-color: rgba(231, 76, 60, 0.95);
    color: white;
}

.toast.toast-warning {
    background-color: rgba(243, 156, 18, 0.95);
    color: white;
}

.toast.toast-info {
    background-color: rgba(52, 152, 219, 0.95);
    color: white;
}

/* ============================================================
   响应式设计
   ============================================================ */

/* 平板尺寸 */
@media (max-width: 1024px) {
    :root {
        --right-panel-width: 280px;
    }
}

/* 平板竖屏 / 大屏手机 */
@media (max-width: 768px) {
    :root {
        --left-toolbar-width: 60px;
        --right-panel-width: 260px;
    }

    .header-left {
        gap: var(--space-md);
    }

    .main-nav {
        display: none;
    }

    .logo-text {
        display: none;
    }

    .right-panel {
        position: absolute;
        right: 0;
        top: 0;
        bottom: 0;
        transform: translateX(100%);
        transition: transform var(--transition-normal);
        z-index: 50;
    }

    .right-panel.open {
        transform: translateX(0);
    }

    .toolbar-title {
        font-size: 10px;
        padding: var(--space-xs);
    }

    .tool-btn {
        width: 48px;
    }

    .tool-icon {
        font-size: 18px;
    }

    .tool-label {
        font-size: 9px;
    }

    .canvas-coord-display {
        display: none;
    }
}

/* 手机尺寸 */
@media (max-width: 480px) {
    :root {
        --left-toolbar-width: 52px;
        --header-height: 48px;
    }

    .app-header {
        padding: 0 var(--space-md);
    }

    .user-btn .username {
        display: none;
    }

    .user-btn {
        padding: var(--space-xs);
    }

    .left-toolbar {
        padding: 0;
    }

    .tool-btn {
        width: 44px;
        padding: var(--space-xs) 2px;
    }

    .tool-icon {
        font-size: 16px;
    }

    .tool-label {
        display: none;
    }

    .toolbar-title {
        display: none;
    }

    .canvas-toolbar {
        height: 40px;
        padding: 0 var(--space-sm);
    }

    .canvas-actions .text-btn {
        padding: var(--space-xs) var(--space-sm);
        font-size: 12px;
    }

    .right-panel {
        width: calc(100% - 52px);
    }

    .modal-content {
        width: 95%;
        max-height: 90vh;
    }

    .modal-body {
        padding: var(--space-lg);
    }
}

/* ============================================================
   通用动画
   ============================================================ */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}