/**
 * 几何教学工具样式
 */

/* ============================================================================
   CSS 变量
   ============================================================================ */
:root {
    /* 主色调 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --secondary-color: #764ba2;

    /* 功能色 */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;

    /* 中性色 */
    --bg-color: #f8fafc;
    --sidebar-bg: #ffffff;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* 尺寸 */
    --sidebar-width: 280px;
    --toolbar-height: 60px;
    --info-panel-width: 300px;

    /* 动画 */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* ============================================================================
   基础样式
   ============================================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-color);
    overflow: hidden;
}

/* ============================================================================
   布局
   ============================================================================ */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* ============================================================================
   侧边栏
   ============================================================================ */
#sidebar {
    width: var(--sidebar-width);
    height: 100%;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 20px;
    background: var(--primary-gradient);
    color: white;
}

.sidebar-header h2 {
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.category-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px 0;
}

.category {
    margin-bottom: 4px;
}

.category-header {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    cursor: pointer;
    transition: background-color var(--transition-fast);
    user-select: none;
}

.category-header:hover {
    background-color: #f1f5f9;
}

.category-header.expanded {
    background-color: #f1f5f9;
}

.category-icon {
    font-size: 16px;
    margin-right: 10px;
}

.category-name {
    flex: 1;
    font-weight: 500;
    color: var(--text-primary);
}

.category-arrow {
    font-size: 10px;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.category-items {
    display: none;
    padding-left: 20px;
}

.category-items.expanded {
    display: block;
}

.shape-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px 10px 30px;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.shape-item:hover {
    background-color: #f8fafc;
    border-left-color: var(--primary-color);
}

.shape-item.active {
    background-color: #eff6ff;
    border-left-color: var(--primary-color);
}

.shape-item.active .shape-name {
    color: var(--primary-color);
    font-weight: 500;
}

.shape-name {
    color: var(--text-secondary);
    font-size: 13px;
}

.shape-type-badge {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.shape-type-badge.2d {
    background-color: #dbeafe;
    color: #1d4ed8;
}

/* ============================================================================
   主内容区
   ============================================================================ */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ============================================================================
   工具栏
   ============================================================================ */
#toolbar {
    height: var(--toolbar-height);
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 8px;
    flex-shrink: 0;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 12px;
    border-right: 1px solid var(--border-color);
}

.toolbar-group:last-child {
    border-right: none;
}

.tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px 12px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 56px;
}

.tool-btn:hover {
    background-color: #f1f5f9;
}

.tool-btn.active {
    background: var(--primary-gradient);
    color: white;
}

.tool-btn.active .tool-icon,
.tool-btn.active .tool-label {
    color: white;
}

.tool-icon {
    font-size: 18px;
    margin-bottom: 2px;
}

.tool-label {
    font-size: 11px;
    color: var(--text-secondary);
}

/* 辅助线工具栏组 - 特殊样式，因为按钮较多 */
.toolbar-group.auxiliary-group {
    display: flex;
    flex-wrap: nowrap;
    gap: 2px;
    padding: 0 8px;
    overflow-x: auto;
    max-width: none;
}

.toolbar-group.auxiliary-group .tool-btn {
    padding: 4px 8px;
    min-width: 40px;
    flex-shrink: 0;
}

.toolbar-group.auxiliary-group .tool-icon {
    font-size: 14px;
    margin-bottom: 1px;
}

.toolbar-group.auxiliary-group .tool-label {
    font-size: 9px;
    white-space: nowrap;
}

/* 禁用的工具按钮样式 */
.tool-btn:disabled,
.tool-btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.tool-btn:disabled:hover,
.tool-btn.disabled:hover {
    background: transparent;
}

/* 清除数据按钮 - 危险操作样式 */
.tool-btn.danger:hover {
    background-color: #fef2f2;
    color: var(--danger-color);
}

.tool-btn.danger:hover .tool-icon,
.tool-btn.danger:hover .tool-label {
    color: var(--danger-color);
}

/* ============================================================================
   画布容器
   ============================================================================ */
.canvas-wrapper {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.canvas-container {
    flex: 1;
    position: relative;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    overflow: hidden;
}

#geometryCanvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* ============================================================================
   信息面板
   ============================================================================ */
.info-panel-container {
    width: var(--info-panel-width);
    background: var(--card-bg);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    flex-shrink: 0;
}

#infoPanel {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.info-header {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
}

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

.info-description {
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.6;
    margin-bottom: 20px;
    padding: 12px;
    background-color: #f8fafc;
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-color);
}

.info-properties {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.property {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: var(--radius-md);
}

.property.small {
    padding: 8px 12px;
    background: #f8fafc;
}

.property-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.property-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-color);
}

.property.small .property-value {
    font-size: 14px;
}

.property-group {
    margin-top: 8px;
}

.property-group-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.no-shape {
    text-align: center;
    color: var(--text-muted);
    padding: 40px 20px;
}

/* ============================================================================
   公式区域
   ============================================================================ */
.info-formulas {
    margin-bottom: 20px;
    padding: 16px;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-radius: var(--radius-md);
    border-left: 4px solid #f59e0b;
}

.formula-title {
    font-size: 14px;
    font-weight: 600;
    color: #92400e;
    margin-bottom: 12px;
}

.formula-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px dashed rgba(146, 64, 14, 0.2);
}

.formula-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.formula-name {
    font-size: 12px;
    color: #92400e;
    font-weight: 500;
}

.formula-value {
    font-size: 13px;
    color: #78350f;
    font-family: 'Times New Roman', serif;
    font-style: italic;
}

/* ============================================================================
   操作提示
   ============================================================================ */
.operation-hint {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-lg);
    font-size: 13px;
    z-index: 1000;
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

.operation-hint.show {
    opacity: 1;
}

/* ============================================================================
   帮助面板
   ============================================================================ */
.help-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 2000;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    display: none;
}

.help-panel.show {
    display: block;
}

.help-panel h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.help-section {
    margin-bottom: 20px;
}

.help-section h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.help-item {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    font-size: 13px;
}

.help-key {
    background: #f1f5f9;
    padding: 2px 8px;
    border-radius: 4px;
    font-family: monospace;
    color: var(--text-primary);
}

.help-desc {
    color: var(--text-secondary);
}

.help-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1999;
    display: none;
}

.help-overlay.show {
    display: block;
}

/* ============================================================================
   显示选项
   ============================================================================ */
.display-options {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    background: #fafafa;
}

.display-options h4 {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.display-option {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
}

.display-option:last-child {
    margin-bottom: 0;
}

.display-option input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin-right: 10px;
    accent-color: var(--primary-color);
}

.display-option label {
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
}

/* ============================================================================
   测量结果提示
   ============================================================================ */
.measure-toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--card-bg);
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    font-size: 16px;
    color: var(--text-primary);
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 1000;
}

.measure-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.measure-toast strong {
    color: var(--primary-color);
    font-size: 18px;
}

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

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

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

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

/* ============================================================================
   响应式设计
   ============================================================================ */
@media (max-width: 1200px) {
    :root {
        --sidebar-width: 240px;
        --info-panel-width: 260px;
    }
}

@media (max-width: 992px) {
    :root {
        --sidebar-width: 220px;
        --info-panel-width: 240px;
    }

    .toolbar-group {
        padding: 0 8px;
    }

    .tool-btn {
        padding: 6px 8px;
        min-width: 48px;
    }

    .tool-label {
        display: none;
    }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    #sidebar {
        width: 100%;
        height: auto;
        max-height: 40vh;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .info-panel-container {
        display: none;
    }

    .canvas-wrapper {
        flex-direction: column;
    }

    #toolbar {
        height: auto;
        flex-wrap: wrap;
        padding: 8px;
    }

    .toolbar-group {
        border-right: none;
        padding: 4px;
    }
}

/* ============================================================================
   动画
   ============================================================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.shape-item.active {
    animation: fadeIn var(--transition-fast);
}

.tool-btn.active {
    animation: pulse 0.3s ease;
}

/* ============================================================================
   打印样式
   ============================================================================ */
@media print {
    #sidebar,
    #toolbar,
    .info-panel-container {
        display: none;
    }

    .canvas-container {
        width: 100%;
        height: 100vh;
    }
}