/* buzhidao edu - 主样式文件 */
/* 离线优先，高性能，深色模式 */

:root {
    /* 浅色主题 */
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-input: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --border-focus: #0d9488;
    --accent: #0d9488;
    --accent-hover: #0f766e;
    --accent-light: #ccfbf1;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 20px rgba(13, 148, 136, 0.3);
    --grid-color: #e2e8f0;
    --axis-color: #475569;
    --canvas-bg: #ffffff;
}

[data-theme="dark"] {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #16161f;
    --bg-input: #1e1e2a;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #2d2d3a;
    --border-focus: #14b8a6;
    --accent: #14b8a6;
    --accent-hover: #2dd4bf;
    --accent-light: #134e4a;
    --success: #34d399;
    --warning: #fbbf24;
    --error: #f87171;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4);
    --shadow-glow: 0 0 30px rgba(20, 184, 166, 0.4);
    --grid-color: #2d2d3a;
    --axis-color: #94a3b8;
    --canvas-bg: #0d0d12;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', system-ui, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* 背景效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(13, 148, 136, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(59, 130, 246, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* 布局 */
.app-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 1rem;
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 1.5rem;
    min-height: 100vh;
}

@media (max-width: 1200px) {
    .app-container {
        grid-template-columns: 1fr;
    }
}

/* 顶部导航 */
.top-bar {
    grid-column: 1 / -1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background: var(--bg-card);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    animation: slideDown 0.5s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent), #3b82f6);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    font-size: 1.25rem;
    box-shadow: var(--shadow-glow);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: 12px;
}

.nav-tab {
    padding: 0.5rem 1.25rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.nav-tab:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

.nav-tab.active {
    background: var(--accent);
    color: white;
    box-shadow: var(--shadow-sm);
}

.theme-toggle {
    width: 44px;
    height: 44px;
    border: none;
    background: var(--bg-secondary);
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background: var(--accent-light);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 22px;
    height: 22px;
    color: var(--text-primary);
    transition: transform 0.3s ease;
}

.theme-toggle:hover svg {
    transform: rotate(15deg);
}

/* 主画布区域 */
.canvas-section {
    background: var(--bg-card);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: fadeIn 0.6s ease 0.1s both;
}

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

.canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.canvas-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.canvas-title input {
    background: transparent;
    border: none;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    width: 200px;
    outline: none;
}

.canvas-title input::placeholder {
    color: var(--text-muted);
}

.canvas-actions {
    display: flex;
    gap: 0.5rem;
}

.icon-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-card);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.icon-btn:hover {
    background: var(--accent-light);
    color: var(--accent);
    transform: translateY(-2px);
}

.icon-btn svg {
    width: 18px;
    height: 18px;
}

.canvas-wrapper {
    position: relative;
    width: 100%;
    height: 500px;
    background: var(--canvas-bg);
    overflow: hidden;
    border-radius: 12px;
}

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

.canvas-info {
    position: absolute;
    bottom: 10px;
    left: 10px;
    font-size: 0.75rem;
    color: var(--text-muted);
    background: rgba(0,0,0,0.5);
    padding: 4px 8px;
    border-radius: 4px;
    pointer-events: none;
}

/* 控制面板 */
.control-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    animation: fadeIn 0.6s ease 0.2s both;
}

.panel-card {
    background: var(--bg-card);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    cursor: pointer;
    transition: background 0.2s ease;
}

.panel-header:hover {
    background: var(--accent-light);
}

.panel-title {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.panel-title svg {
    width: 18px;
    height: 18px;
    color: var(--accent);
}

.panel-toggle {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.panel-toggle.collapsed {
    transform: rotate(-90deg);
}

.panel-content {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-height: 500px;
    overflow-y: auto;
    transition: all 0.3s ease;
}

.panel-content.collapsed {
    max-height: 0;
    padding: 0 1.25rem;
    overflow: hidden;
}

/* 表单元素 */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-input {
    padding: 0.625rem 0.875rem;
    background: var(--bg-input);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
    outline: none;
}

.form-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-light);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

/* 函数列表 */
.function-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 300px;
    overflow-y: auto;
}

.function-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 10px;
    border: 2px solid transparent;
    transition: all 0.2s ease;
}

.function-item:hover {
    border-color: var(--accent-light);
}

.function-item.active {
    border-color: var(--accent);
    background: var(--accent-light);
}

.function-color {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: var(--shadow-sm);
}

.function-expr {
    flex: 1;
    font-family: 'Consolas', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    background: transparent;
    border: none;
    outline: none;
}

.function-range {
    font-size: 0.75rem;
    color: var(--text-muted);
    width: 80px;
    text-align: right;
}

.function-actions {
    display: flex;
    gap: 0.25rem;
}

.function-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.function-btn:hover {
    background: var(--bg-card);
    color: var(--accent);
}

.function-btn.delete:hover {
    color: var(--error);
}

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

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

.btn-secondary:hover {
    background: var(--accent-light);
    color: var(--accent);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-danger {
    background: var(--error);
    color: white;
}

.btn-block {
    width: 100%;
}

/* 数学符号键盘 */
.math-keyboard {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.5rem;
}

.math-key {
    padding: 0.5rem;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: 'Consolas', monospace;
}

.math-key:hover {
    background: var(--accent-light);
    color: var(--accent);
    transform: scale(1.05);
}

.math-key:active {
    transform: scale(0.95);
}

.math-key.func {
    background: var(--accent-light);
    color: var(--accent);
}

.math-key.operator {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

/* 滑块 */
.slider-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.slider-value {
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 600;
    font-family: monospace;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* 颜色选择器 */
.color-picker-wrapper {
    position: relative;
    display: inline-block;
}

.color-picker {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    padding: 0;
    overflow: hidden;
}

.color-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker::-webkit-color-swatch {
    border: none;
    border-radius: 8px;
}

/* 下拉选择 */
select.form-input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

/* 复选框 */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-group input {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

/* 标签页内容 */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* 几何画板 */
.geometry-tools {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.geometry-tool {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.75rem 0.5rem;
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.geometry-tool:hover {
    background: var(--accent-light);
    color: var(--accent);
}

.geometry-tool.active {
    border-color: var(--accent);
    background: var(--accent-light);
    color: var(--accent);
}

.geometry-tool svg {
    width: 24px;
    height: 24px;
}

.geometry-tool span {
    font-size: 0.7rem;
    font-weight: 500;
}

/* 化学方程 */
.chem-input-area {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chem-preview {
    min-height: 80px;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 10px;
    font-size: 1.25rem;
    font-family: 'Times New Roman', serif;
    text-align: center;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.chem-element-btn {
    padding: 0.5rem 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.chem-element-btn:hover {
    background: var(--accent-light);
    border-color: var(--accent);
}

/* 工具栏 */
.toolbar {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.toolbar-btn {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: none;
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.toolbar-btn:hover {
    background: var(--accent-light);
    color: var(--accent);
}

/* 消息提示 */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    padding: 1rem 1.5rem;
    background: var(--bg-card);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    z-index: 1000;
    transition: transform 0.3s ease;
    border-left: 4px solid var(--accent);
}

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

.toast.error {
    border-color: var(--error);
}

.toast.success {
    border-color: var(--success);
}

.toast.warning {
    border-color: var(--warning);
}

/* 模态框 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal-overlay.show .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-secondary);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: var(--error);
    color: white;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 3px;
}

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

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

/* 响应式 */
@media (max-width: 768px) {
    .app-container {
        padding: 0.5rem;
        gap: 0.75rem;
    }

    .top-bar {
        flex-wrap: wrap;
        gap: 0.75rem;
        padding: 0.5rem 0.75rem;
    }

    .logo-text {
        font-size: 1.2rem;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    .nav-tabs {
        order: 3;
        width: 100%;
        justify-content: center;
    }

    .nav-tab {
        padding: 0.35rem 0.5rem;
        font-size: 0.75rem;
        display: flex;
        align-items: center;
        gap: 0.25rem;
    }

    .nav-tab svg {
        width: 14px;
        height: 14px;
    }

    .canvas-wrapper {
        height: 300px;
    }

    .canvas-section, .control-panel {
        padding: 0;
    }

    .canvas-header {
        padding: 0.5rem 0.75rem;
    }

    .panel-card {
        margin-bottom: 0.5rem;
    }

    .panel-header {
        padding: 0.75rem;
    }

    .panel-content {
        padding: 0.75rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .math-keyboard {
        grid-template-columns: repeat(5, 1fr);
    }

    .math-key {
        padding: 0.4rem 0.25rem;
        font-size: 0.75rem;
    }

    .extra-tools {
        grid-template-columns: repeat(3, 1fr);
    }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }

    .function-list {
        max-height: 200px;
    }

    .formula-overlay {
        bottom: 5px;
        left: 5px;
        padding: 5px 8px;
        font-size: 0.65rem;
        max-width: 120px;
        max-height: 80px;
    }
}

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

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.loading {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-card) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* 函数详情面板 */
.function-details {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1rem;
    margin-top: 0.5rem;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.detail-row:last-child {
    border-bottom: none;
}

.detail-label {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.detail-value {
    color: var(--text-primary);
    font-weight: 600;
    font-family: monospace;
}

/* 交点标记 */
.intersection-marker {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--error);
    border-radius: 50%;
    border: 2px solid white;
    transform: translate(-50%, -50%);
    box-shadow: var(--shadow-sm);
}

/* 点标记 */
.point-marker {
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--accent);
    border-radius: 50%;
    border: 2px solid white;
    transform: translate(-50%, -50%);
    box-shadow: var(--shadow-sm);
    cursor: move;
}

/* 备用工具区 */
.extra-tools {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.extra-tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.extra-tool-btn:hover {
    border-color: var(--accent-light);
    color: var(--accent);
}

.extra-tool-btn svg {
    width: 20px;
    height: 20px;
}

.extra-tool-btn span {
    font-size: 0.7rem;
}

/* 函数解析式覆盖层 */
.formula-overlay {
    position: absolute;
    bottom: 10px;
    left: 10px;
    background: rgba(255, 255, 255, 0.92);
    padding: 8px 12px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    font-size: 0.8rem;
    max-width: 180px;
    max-height: 120px;
    overflow-y: auto;
    z-index: 10;
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .formula-overlay {
    background: rgba(30, 30, 42, 0.95);
}

.formula-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.formula-item {
    display: flex;
    align-items: center;
    padding: 3px 0;
    font-family: 'Consolas', monospace;
}

/* 点模态框 */
#pointModal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

#pointModal.show {
    opacity: 1;
    visibility: visible;
}

/* 点列表样式 */
.point-item input[type="color"] {
    padding: 0;
    border: none;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .formula-overlay {
        top: 5px;
        right: 5px;
        padding: 8px 10px;
        font-size: 0.75rem;
        max-width: 150px;
    }
}