/* =================================================================
   全局样式 (Global Styles)
=================================================================
*/
:root {
    --theme-color: #e0b400; /* 主题色 (金色) */
    --theme-color-dark: #c79e00;
    --text-primary: #1a1a1a;
    --text-secondary: #4d4d4d;
    --bg-color: #f7f7f5; /* 主背景色 (米色) */
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
}

/* 基本重置和字体设置 */
body, html {
    margin: 0;
    padding: 0;
    font-family: 'Inter', 'Helvetica Neue', 'Arial', 'sans-serif', 'Microsoft YaHei';
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
    box-sizing: border-box;
}

*, *:before, *:after {
    box-sizing: inherit;
}

/* 链接样式 */
a {
    color: var(--theme-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--theme-color-dark);
}

/* 标题 */
h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    margin-bottom: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* =================================================================
   主页样式 (index.html - Hero Section)
=================================================================
*/
.hero-section {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #1a1a1a; /* 深色背景 */
    color: #ffffff;
    text-align: center;
    padding: 20px;
    background-color: #1a1a1a; /* 备用深色背景 */
    background-image: linear-gradient(rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.4)),
                      url('images/hero_bg.jpg');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
}

.hero-content {
    max-width: 1200px;
}

.hero-title {
    font-size: 5rem;
    color: #ffffff;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 400;
    color: #cccccc;
    margin-bottom: 2.5rem;
}

.hero-button {
    font-size: 1.1rem;
    font-weight: 700;
    padding: 14px 30px;
    border: none;
    border-radius: 8px;
    background-color: var(--theme-color);
    color: #000000;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.hero-button:hover {
    background-color: var(--theme-color-dark);
    color: #000000;
    transform: translateY(-2px);
}

/* =================================================================
   主应用布局 (layout.html)
=================================================================
*/
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- 顶部导航 --- */
.app-header {
    width: 100%;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0 50px;
    display: flex;
    align-items: center;
    height: 60px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.home-button {
    font-size: 1.2rem;
    color: var(--text-secondary);
    padding: 10px 15px;
    margin-right: 20px;
    border-radius: 8px;
}
.home-button:hover {
    background-color: var(--bg-color);
    color: var(--text-primary);
}

.step-item {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 20px 15px;
    border-bottom: 3px solid transparent;
}

.step-item:hover {
    color: var(--text-primary);
}

.step-item.active {
    color: var(--text-primary);
    border-bottom: 3px solid var(--theme-color);
    font-weight: 700;
}

/* --- 主内容区 --- */
.app-content {
    flex-grow: 1;
    width: 100%;
    max-width: 1600px; /* 内容最大宽度 */
    margin: 0 auto;
    padding: 30px 20px 100px 20px; /* 底部 padding 留出空间给 footer */
}

/* --- 底部导航 --- */
.app-footer {
    width: 100%;
    height: 70px;
    background-color: rgba(255, 255, 255, 0.9); /* 半透明 */
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    position: fixed;
    bottom: 0;
    z-index: 100;
    backdrop-filter: blur(5px);
}

.footer-icon {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* =================================================================
   通用组件 (Buttons, Cards, Forms)
=================================================================
*/

/* --- 卡片 --- */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    margin-bottom: 20px;
}
.full-width-card {
    width: 100%;
}

/* 卡片网格布局 (用于 Step 3) */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

/* --- 按钮 --- */
.btn {
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex; /* 用于对齐图标 */
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--theme-color);
    color: #000000;
}
.btn-primary:hover {
    background-color: var(--theme-color-dark);
    color: #000000;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
    background-color: #f0f0f0;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover {
    background-color: #e6e6e6;
    color: var(--text-primary);
}

.btn:disabled {
    background-color: #f0f0f0;
    color: #aaa;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn i {
    margin-right: 8px;
}

/* --- 内容标题 --- */
.content-header {
    margin-bottom: 25px;
}
.content-header h1 {
    font-size: 2.2rem;
    margin-bottom: 5px;
}
.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-top: 0;
}

/* --- 表单元素 --- */
.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 15px;
}
.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 5px;
}
.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
}
.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--theme-color);
    box-shadow: 0 0 0 2px rgba(224, 180, 0, 0.3);
}

/* =================================================================
   Step 1: 问题定义
=================================================================
*/
.step1-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 25px;
}

.sidebar {
    position: sticky; /* 侧边栏吸顶 */
    top: 90px; /* 60px (header) + 30px (padding) */
}
.sidebar nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.sidebar nav li a {
    display: block;
    padding: 10px 15px;
    border-radius: 8px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 5px;
}
.sidebar nav li a.active {
    background-color: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.sidebar nav li a.disabled {
    color: #aaa;
    cursor: not-allowed;
    text-decoration: line-through;
}

.diagram-placeholder {
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.main-form {
    /* 继承 .card 样式 */
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.form-section {
    margin-bottom: 30px;
}
.form-section h3 {
    font-size: 1.1rem;
    font-weight: 700;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.form-section-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

/* =================================================================
   Step 2: 优化模型配置
=================================================================
*/
.step2-layout {
    display: block;
}

/* [新增] 9宫格网格布局 */
.step2-var-grid {
    display: grid;
    /* 修改: 强制分为 3 等份，不再自动适应 */
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 20px;
}

/* 添加媒体查询，在小屏幕下回退到 2 列或 1 列 */
@media (max-width: 1200px) {
    .step2-var-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 768px) {
    .step2-var-grid {
        grid-template-columns: 1fr;
    }
}

/* [新增] 单个变量卡片 */
.var-item {
    border: 1.5px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    background-color: #ffffff;
}

/* [新增] 变量卡片头部 (标题和符号) */
.var-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.var-item h4 {
    margin: 0;
    font-size: 1.1rem;
}

.var-item .symbol {
    font-family: 'Times New Roman', Times, serif;
    font-style: italic;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin: 0;
}

/* [新增] 变量图示 */
.var-diagram {
    width: 100%;

    /* [修改] 移除 height: auto */

    /* [新增] 强制设置一个统一的高宽比 (例如 3:1) */
    /* 您可以修改 3 / 1 来调整为您想要的比例 */
    aspect-ratio: 3 / 1;

    /* [新增] 关键: 确保图片完整显示在容器内，而不是拉伸 */
    object-fit: contain;

    border-radius: 6px;
    margin-bottom: 15px;
    background-color: #ffffff;
    border: 1px solid #ffffff;
}

/* [新增] [Min, Max, Step]
   3列输入框布局 */
.var-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
}

.var-inputs .form-group {
    margin-bottom: 0; /* 移除 .form-group 的默认下边距 */
}

.var-inputs .form-group label {
    font-size: 0.8rem; /* 标签小一点 */
}

/* 表格样式 */
.table-container {
    width: 100%;
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}
table th, table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
table th {
    background-color: #f9f9f9;
    font-weight: 700;
}
table tbody tr:hover {
    background-color: #f7f7f7;
}

/* =================================================================
   Step 3: 代理模型配置
=================================================================
*/
.model-card {
    display: flex;
    flex-direction: column;
    padding: 20px;
    cursor: pointer;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.model-card:hover {
    border-color: var(--theme-color);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.07);
}
.model-card.active {
    border-color: var(--theme-color);
    border-width: 2px;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.07);
}

.model-img {
    width: 100%;
    height: 150px;
    object-fit: contain;
    margin: 10px 0;
    border-radius: 8px;
}
.model-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    flex-grow: 1; /* 让 p 占据空间，使按钮对齐 */
    margin-bottom: 15px;
}
.model-card .btn {
    width: 100%;
    margin-top: 5px;
}


/* =================================================================
   Step 4: 生成式设计
=================================================================
*/
#step4-form .form-group {
    max-width: 400px;
    margin-bottom: 20px;
}

#run-optimization-btn {
    font-size: 1.1rem;
    padding: 12px 25px;
    margin-top: 10px;
}

#loading-spinner {
    display: none; /* 默认隐藏 */
    width: 20px;
    height: 20px;
    border: 3px solid rgba(0, 0, 0, 0.2);
    border-top-color: #000;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 10px;
}

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

/* =================================================================
   Step 5: 优化进度与结果
=================================================================
*/

/* --- 区域 1: 加载中 --- */
.progress-bar-background {
    width: 100%;
    background-color: #eeeeee;
    border-radius: 6px;
    height: 20px;
    overflow: hidden;
    border: 1px solid #dddddd;
    margin-top: 15px;
}

#progress-bar-fill {
    width: 0%;
    height: 100%;
    background-color: var(--theme-color);
    border-radius: 6px;
    transition: width 0.5s ease-in-out;
}

#progress-details {
    font-size: 13px;
    color: #333333;
    margin-top: 8px;
    text-align: center;
}

#log-container {
    width: 100%;
}

#log-output {
    background-color: #ffffff;
    color: #000000; /* 终端绿 */
    font-family: 'Courier New', Courier, monospace;
    padding: 15px;
    border-radius: 8px;
    height: 300px;
    overflow-y: scroll;
    border: 1px solid #333;
    white-space: pre; /* 保留换行 */
    font-size: 12px;
    line-height: 1.4;
}

/* --- 区域 2 & 3: 结果 --- */

/* 隐藏工具类 */
.hidden {
    display: none;
}

/* 操作按钮容器 */
.results-actions-container {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin-top: 25px;
    padding: 10px;
}

/* 确保所有卡片内的 h3 都有合适的间距 */
.card h3 {
    margin-top: 10px;
    margin-bottom: 15px;
}
.card h3:first-child {
    margin-top: 0;
}

/* 3D iframe 容器样式 */
#plot-container-3d {
    width: 100%;
    height: 600px; /* 给一个固定高度 */
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    background: #f9f9f9;
    resize: vertical; /* 允许用户垂直拖动调整大小 */
}

/* 3D iframe 样式 */
#plot-iframe-3d {
    width: 100%;
    height: 100%;
    border: none;
    min-height: 580px; /* 确保最小高度以防止折叠 */
}

/* 2D 图像容器样式 */
#plot-container-2d {
    width: 100%;
    max-width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: #f9f9f9;
    box-sizing: border-box;
}

/* 2D 图像样式 */
#plot-image-2d {
    max-width: 100%; /* 确保图像不会撑破容器，只会缩小 */
    width: auto;
    height: auto;
    display: block;
    border-radius: 6px;
    margin: 0 auto; /* 居中显示 */
}

/* =================================================================
   响应式设计
=================================================================
*/
@media (max-width: 768px) {
    /* --- 布局 --- */
    .app-header {
        padding: 0 15px;
    }
    .app-content {
        padding: 20px 15px 100px 15px;
    }

    /* --- Step 1 --- */
    .step1-layout {
        grid-template-columns: 1fr; /* 垂直堆叠 */
    }
    .sidebar {
        position: static;
        width: 100%;
    }
    .form-grid {
        grid-template-columns: 1fr 1fr; /* 3列 -> 2列 */
    }
    .form-section-columns {
        grid-template-columns: 1fr; /* 2列 -> 1列 */
    }

    /* --- Step 2 --- */
    .step2-layout {
        grid-template-columns: 1fr;
    }

    /* --- Step 3 --- */
    .card-grid {
        grid-template-columns: 1fr; /* 1列 */
    }

    /* --- 首页 --- */
    .hero-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    /* --- Step 1 --- */
    .form-grid {
        grid-template-columns: 1fr; /* 2列 -> 1列 */
    }
}

.step4-grid {
    display: grid;
    /* 两列布局 */
    grid-template-columns: 1fr 1fr;
    gap: 20px 25px;
    margin-top: 20px;
}

/* [新增] "开始生成" 按钮容器 */
.start-button-container {
    display: flex;
    align-items: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}


/* [新增] 标签和 ? 图标的容器 */
.form-group-with-tooltip {
    display: flex;
    align-items: center;
    gap: 8px; /* 标签和图标之间的间距 */
    margin-bottom: 5px; /* 沿用旧的 .form-group label 间距 */
}

.form-group-with-tooltip label {
    margin-bottom: 0; /* 重置 .form-group label 的间距 */
}

/* [新增] ? 提示图标样式 */
.tooltip-icon {
    display: inline-block;
    width: 18px;
    height: 18px;
    line-height: 18px; /* 垂直居中文字 */
    text-align: center;
    background-color: #e0e0e0;
    color: var(--text-secondary);
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    cursor: help;
    /* 防止用户选择 ? 符号 */
    user-select: none;

    /* [新增] 为自定义提示框定位 */
    position: relative;
}
.tooltip-icon:hover {
    background-color: var(--theme-color);
    color: #000;
}

/* [新增] 自定义提示框的样式 */
.tooltip-icon::after {
    content: attr(data-tooltip); /* 从 data-tooltip 属性获取文字 */
    position: absolute;
    bottom: 140%; /* 定位在 ? 图标上方 */
    left: 50%;
    transform: translateX(-50%);

    /* 外观 */
    background-color: #333;
    color: #fff;
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    white-space: normal; /* 允许文字换行 */
    width: 280px; /* 提示框宽度 */
    text-align: left;
    line-height: 1.5;

    /* 默认隐藏 */
    visibility: hidden;
    opacity: 0;
    z-index: 10;

    /* 立即显示的关键 */
    transition: opacity 0.1s ease, visibility 0.1s ease;
}

/* [新增] 悬停时立即显示 */
.tooltip-icon:hover::after {
    visibility: visible;
    opacity: 1;
    transition-delay: 0s; /* [关键] 移除延迟 */
}

.hidden {
    display: none;
}
/* [!! 结束修复 !!] */

.modal-overlay {
    position: fixed; /* 固定在屏幕上 */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6); /* 半透明黑色遮罩 */
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000; /* 确保在最上层 */
    padding: 20px;
}

.modal-content {
    background-color: #ffffff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 600px; /* 弹窗最大宽度 */
    max-height: 90vh; /* 弹窗最大高度 */
    overflow-y: auto; /* 内容过多时滚动 */
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
}

.modal-close {
    font-size: 2.5rem;
    font-weight: 300;
    color: #888;
    line-height: 1;
    cursor: pointer;
    padding: 0 5px;
}
.modal-close:hover {
    color: #000;
}

.modal-body #modal-image {
    width: 100%;
    max-height: 300px; /* 限制图片最大高度 */
    object-fit: contain; /* 保持图片比例 */
    border-radius: 6px;
    margin-bottom: 20px;
    background-color: #f9f9f9;
}

.modal-body #modal-description {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    white-space: pre-wrap; /* 保留描述中的换行符 */
}
.hidden {
    display: none !important;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    /* 确保默认隐藏 */
    display: none;
}

.modal-overlay:not(.hidden) {
    display: flex;
}