/* 全局样式 */
:root {
    --primary-color: #A2CFFE;
    --secondary-color: #D4A5FF;
    --accent-color: #6aa84f;
    --background-color: #f5f7fa;
    --light-accent: #e6f0ff;
    --dark-text: #2c3e50;
    --light-text: #ffffff;
    --border-radius: 12px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

/* 浅色模式（明确定义，防止样式泄漏） */
[data-theme="light"] {
    --primary-color: #A2CFFE;
    --secondary-color: #D4A5FF;
    --accent-color: #6aa84f;
    --background-color: #f5f7fa;
    --light-accent: #e6f0ff;
    --dark-text: #2c3e50;
    --light-text: #ffffff;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

/* 深色模式变量 */
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #8b5cf6;
    --accent-color: #22c55e;
    --background-color: #1f2937;
    --light-accent: #374151;
    --dark-text: #e5e7eb;
    --light-text: #d1d5db;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Open Sans', Arial, sans-serif;
}

body {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--dark-text);
    line-height: 1.8;
    padding: 20px;
}

/* 美化学习检测按钮 */
.check-answer-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--light-text);
    border: none;
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.3s ease;
}

.check-answer-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 8px rgba(74,134,232,0.5);
}

.check-answer-btn:disabled {
    background: #4b5563;
    cursor: not-allowed;
}

/* 页面布局 */
#decision-tree-course {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--background-color) !important;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
}

/* 标题区样式 */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--light-text);
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
}

header::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shine 3s infinite;
}

@keyframes shine {
    0% { left: -100%; }
    100% { left: 100%; }
}

header h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    position: relative;
    animation: slideUp 0.8s ease-out;
}

.subtitle {
    font-size: 1.2rem;
    font-weight: 300;
    position: relative;
    animation: slideUp 1s ease-out 0.2s;
    animation-fill-mode: backwards;
}

.powered-by {
    font-size: 1rem;
    font-weight: 300;
    color: var(--light-text);
    margin-top: 8px;
    opacity: 0;
    animation: slideUp 1.2s ease-out 0.4s forwards;
}

/* 导航容器样式 */
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 12px;
}

/* 导航样式 */
.learning-nav {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    flex-grow: 1;
}

.learning-nav button {
    flex: 1;
    min-width: 120px;
    padding: 12px 15px;
    background-color: #e6e6e6;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.3s ease;
    position: relative;
    overflow: hidden;
    will-change: transform;
}

[data-theme="light"] .learning-nav button {
    background-color: #e6e6e6;
}

[data-theme="dark"] .learning-nav button {
    background-color: #4b5563;
}

.learning-nav button:hover {
    background-color: #d1d5db;
    transform: scale(1.03);
}

[data-theme="dark"] .learning-nav button:hover {
    background-color: #6b7280;
}

.learning-nav button:active {
    transform: scale(0.95);
}

.learning-nav button.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--light-text);
}

.learning-nav button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shine 1s infinite paused;
}

.learning-nav button:hover::before {
    animation-play-state: running;
}

/* 主题切换按钮样式 */
.theme-toggle {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--light-text);
    border: none;
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform 0.2s ease, box-shadow 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 0 8px rgba(74,134,232,0.5);
}

/* 内容区样式 */
.content-container {
    min-height: 400px;
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid #e0e0e0;
    margin-bottom: 30px;
    background-color: var(--background-color) !important;
}

[data-theme="light"] .content-container {
    border-color: #e0e0e0;
}

[data-theme="dark"] .content-container {
    border-color: #4b5563;
}

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

.page-exit {
    animation: fadeOut 0.4s ease-in forwards;
}

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


/* 垃圾代码 ############################################################################################################################################### */

/* 问题链和互动元素样式 */
.question-chain, .interactive-element {
    margin: 20px 0;
    padding: 15px;
    background-color: var(--light-accent) !important;
    border-radius: var(--border-radius);
    border-left: 5px solid var(--primary-color);
    opacity: 0;
    transform: translateY(30px);
    animation: slideUp 0.6s ease forwards;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.question-chain h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.question-item {
    margin-bottom: 15px;
    padding: 10px;
    background-color: var(--background-color) !important;
    border-radius: 8px;
    box-shadow: var(--box-shadow);
}

/* 决策树构建器样式 */
.tree-canvas {
    width: 100%;
    height: 300px;
    border: 2px dashed #ccc;
    margin: 15px 0;
    border-radius: var(--border-radius);
    position: relative;
}

[data-theme="light"] .tree-canvas {
    border-color: #ccc;
}

[data-theme="dark"] .tree-canvas {
    border-color: #6b7280;
}

.node {
    padding: 10px 15px;
    border-radius: 20px;
    cursor: move;
    user-select: none;
    transition: transform 0.2s ease;
}

.node.root { background-color: var(--primary-color); color: var(--light-text); }
.node.condition { background-color: var(--secondary-color); color: var(--light-text); }
.node.outcome { background-color: var(--accent-color); color: var(--light-text); }

.node.dragging {
    transform: rotate(2deg);
}

/* 场景选择器样式 */
.scenario-selector {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin: 20px 0;
}

.scenario-card {
    width: 200px;
    padding: 15px;
    background-color: var(--background-color) !important;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.scenario-card:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.scenario-card img {
    width: 80px;
    height: 80px;
    margin-bottom: 10px;
}

/* 教师指导区域 */
.teacher-guidance {
    margin: 30px 0;
    text-align: center;
}

#show-guidance {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--light-text);
    padding: 10px 20px;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

#show-guidance:hover {
    transform: scale(1.05);
    box-shadow: 0 0 8px rgba(74,134,232,0.5);
}

.guidance-content {
    margin-top: 20px;
    padding: 20px;
    background-color: var(--light-accent) !important;
    border-radius: var(--border-radius);
    animation: slideIn 0.5s ease-out;
}

/* 分享区域 */
.share-section {
    margin: 30px 0;
    text-align: center;
    padding: 20px;
    background-color: var(--light-accent) !important;
    border-radius: var(--border-radius);
}

#share-button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--light-text);
    padding: 10px 25px;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.3s ease;
}

#share-button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 8px rgba(74,134,232,0.5);
}

#share-link {
    width: 100%;
    max-width: 400px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-top: 10px;
    background-color: var(--background-color) !important;
    color: var(--dark-text);
}

[data-theme="light"] #share-link {
    border-color: #ddd;
}

[data-theme="dark"] #share-link {
    border-color: #6b7280;
}

/* 徽章奖励系统 */
.badge-container {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin: 20px 0;
}

.badge {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: #e6e6e6;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease;
}

[data-theme="light"] .badge {
    background-color: #e6e6e6;
}

[data-theme="dark"] .badge {
    background-color: #4b5563;
}

.badge.earned {
    background: linear-gradient(135deg, #ffd700, #ffaa00);
    animation: badgeUnlock 0.8s ease forwards;
}

@keyframes badgeUnlock {
    0% { transform: scale(0.5) rotate(0deg); opacity: 0; }
    50% { box-shadow: 0 0 15px #ffd700; }
    100% { transform: scale(1) rotate(360deg); opacity: 1; box-shadow: 0 0 10px rgba(255,215,0,0.5); }
}

.badge-icon {
    font-size: 30px;
}

.badge-tooltip {
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: var(--light-text);
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 12px;
    opacity: 0;
    transition: all 0.3s;
    pointer-events: none;
    white-space: nowrap;
}

.badge:hover .badge-tooltip {
    opacity: 1;
    bottom: -25px;
}

/* 评估部分样式 */
.assessment-container {
    margin: 20px 0;
}

.assessment-question {
    margin-bottom: 25px;
    padding: 20px;
    background-color: var(--light-accent) !important;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    animation: slideUp 0.6s ease;
}

.drag-drop-container {
    margin: 15px 0;
    padding: 15px;
    background-color: var(--background-color) !important;
    border-radius: 8px;
    min-height: 100px;
}

.draggable-item {
    display: inline-block;
    padding: 8px 15px;
    margin: 5px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--light-text);
    border-radius: 20px;
    cursor: move;
    transition: transform 0.2s ease;
}

.draggable-item.dragging {
    transform: rotate(2deg);
}

.placed-item {
    animation: bounceIn 0.4s ease;
}

@keyframes bounceIn {
    0% { transform: scale(0.8); }
    60% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.drop-zone {
    min-height: 50px;
    border: 2px dashed #ccc;
    margin-top: 15px;
    border-radius: 8px;
    padding: 10px;
    background-color: var(--background-color) !important;
}

[data-theme="light"] .drop-zone {
    border-color: #ccc;
}

[data-theme="dark"] .drop-zone {
    border-color: #6b7280;
}

/* 动画开关按钮 */
.animation-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 8px 15px;
    background-color: #6c757d;
    color: var(--light-text);
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.animation-toggle:hover {
    transform: scale(1.05);
}

/* 互动实践样式 */
.animal-quiz-container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--background-color) !important;
}

.game-introduction {
    background-color: var(--light-accent) !important;
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
}

.stat-box {
    background-color: var(--background-color) !important;
    padding: 10px;
    border-radius: 8px;
    flex: 1;
    min-width: 150px;
    text-align: center;
    box-shadow: var(--box-shadow);
}

.stat-box h4 {
    margin-top: 0;
    color: var(--primary-color);
}

.stat-box div {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.game-interface {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.question-area, .tree-visualization {
    flex: 1;
    min-width: 350px;
    background-color: var(--background-color) !important;
    padding: 25px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
}

.answer-btn {
    flex: 1;
    padding: 15px;
    font-size: 18px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.3s ease;
}

.answer-btn[data-answer="yes"] {
    background-color: var(--accent-color);
    color: var(--light-text);
}

.answer-btn[data-answer="no"] {
    background-color: #e74c3c;
    color: var(--light-text);
}

.answer-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

#play-again-btn, #view-all-animals, #reset-game {
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

#play-again-btn {
    background-color: var(--primary-color);
    color: var(--light-text);
}

#view-all-animals {
    background-color: var(--secondary-color);
    color: var(--light-text);
}

#reset-game {
    background-color: #e74c3c;
    color: var(--light-text);
}

#play-again-btn:hover, #view-all-animals:hover, #reset-game:hover {
    transform: translateY(-1px);
}

#animals-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.7);
    z-index: 1000;
    overflow-y: auto;
}

#animals-modal > div {
    max-width: 900px;
    margin: 50px auto;
    background-color: var(--background-color) !important;
    border-radius: 10px;
    padding: 30px;
    position: relative;
}

#close-modal {
    position: absolute;
    right: 20px;
    top: 20px;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--dark-text);
}

#animals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

.animal-card {
    background-color: var(--light-accent) !important;
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    transition: transform 0.2s;
    box-shadow: var(--box-shadow);
    position: relative;
}

.animal-card:hover {
    transform: translateY(-5px);
}

.animal-card.undiscovered .animal-emoji, .animal-card.undiscovered .animal-name {
    filter: blur(5px);
}

.animal-card.undiscovered::after {
    content: "?";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 40px;
    color: var(--dark-text);
}

.tree-node {
    padding: 8px 12px;
    border-radius: 5px;
    margin: 2px 0;
    font-size: 14px;
    transition: background-color 0.3s;
    border: 1px solid #e0e0e0;
    background-color: var(--background-color) !important;
}

[data-theme="light"] .tree-node {
    border-color: #e0e0e0;
}

[data-theme="dark"] .tree-node {
    border-color: #6b7280;
}

.tree-node.active {
    background-color: var(--primary-color) !important;
    border-color: var(--secondary-color);
}

.tree-node.path {
    background-color: var(--light-accent) !important;
    border-color: var(--primary-color);
}

.tree-branch {
    position: relative;
    margin-left: 20px;
    padding-left: 15px;
    border-left: 2px dashed #ccc;
}

[data-theme="light"] .tree-branch {
    border-color: #ccc;
}

[data-theme="dark"] .tree-branch {
    border-color: #6b7280;
}

.tree-branch-label {
    font-style: italic;
    font-size: 13px;
    margin: 5px 0;
}

.tree-branch-label.yes {
    color: var(--accent-color);
}

.tree-branch-label.no {
    color: #e74c3c;
}

/* 概念引入样式 */
.concept-explanation, .decision-tree-applications, .interactive-quiz {
    background-color: var(--light-accent) !important;
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 25px;
    box-shadow: var(--box-shadow);
    animation: slideUp 0.6s ease;
}

.key-components, .decision-process, .advantages-disadvantages {
    margin: 15px 0;
    padding: 15px;
    background-color: var(--background-color) !important;
    border-radius: 5px;
    border-left: 4px solid var(--primary-color);
}

.two-column {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.column {
    flex: 1;
    min-width: 250px;
}

.application-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 15px;
}

.application-card {
    flex: 1;
    min-width: 200px;
    background-color: var(--background-color) !important;
    padding: 15px;
    border-radius: 8px;
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease;
}

.application-card:hover {
    transform: translateY(-5px);
}

.card-icon {
    font-size: 30px;
    margin-bottom: 10px;
}

.tree-example-image {
    margin: 25px auto;
    text-align: center;
    background-color: var(--light-accent) !important;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--box-shadow);
    max-width: 90%;
}

.decision-tree-image {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
    animation: fadeIn 0.8s ease;
}

.image-caption {
    margin-top: 15px;
    color: var(--dark-text);
    font-style: italic;
    font-size: 0.9em;
}

/* 选择题样式 */
.interactive-quiz, .multiple-choice {
    background-color: var(--background-color) !important;
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 25px;
    box-shadow: var(--box-shadow);
    animation: slideUp 0.6s ease;
}

.multiple-choice {
    margin: 15px 0;
}

.multiple-choice .option {
    background-color: var(--light-accent);
    padding: 10px;
    margin: 5px 0;
    border-radius: 5px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
    border: 1px solid transparent; /* Add a default transparent border */
}



.multiple-choice .option:hover {
    background-color: var(--light-accent);
    border-color: var(--primary-color);
}

.multiple-choice .option label {
    color: var(--dark-text);
    cursor: pointer;
    margin-left: 0; /* 调整对齐 */
}

.multiple-choice .option input[type="radio"] {
    display: none; /* 隐藏原始单选按钮 */
}

.radio-custom {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-color);
    border-radius: 50%; /* 圆形 */
    background-color: var(--background-color);
    position: relative;
    top: 4px;
    margin-right: 10px;
    transition: all 0.2s ease;
    box-sizing: border-box;
}

.multiple-choice .option input[type="radio"]:checked + label .radio-custom {
    background-color: var(--primary-color); /* 选中时填充颜色 */
    border-color: var(--primary-color);
}

.multiple-choice .option input[type="radio"]:checked + label .radio-custom::after {
    content: '';
    display: block;
    width: 10px;
    height: 10px;
    background: var(--background-color);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.multiple-choice .option label {
    color: var(--dark-text);
    cursor: pointer;
    margin-left: 0; /* 调整对齐 */
    position: relative;
    display: flex;
    align-items: center;
    min-height: 20px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.multiple-choice .option input[type="radio"]:checked + label {
    background-color: var(--primary-color-light); /* 选中项的背景高亮 */
    border-color: var(--primary-color);
}

.quiz-question, .assessment-question .multiple-choice {
    margin-bottom: 20px;
}

.quiz-question p, .assessment-question h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--dark-text);
}

.options, .multiple-choice .options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.option {
    display: flex;
    align-items: center;
    padding: 12px;
    background-color: var(--background-color) !important;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
    position: relative;
    border: 1px solid #e0e0e0;
    pointer-events: auto;
}

.option input[type="radio"]:checked + label + .radio-custom::before {
    content: '';
    display: block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--primary-color);
}

.option input[type="radio"]:checked + label + .radio-custom {
    border-color: var(--primary-color);
    background-color: var(--light-accent);
}

.option input[type="radio"]:checked + label {
    color: var(--primary-color);
}

.option.selected {
    background-color: var(--light-accent) !important;
    border-color: var(--primary-color);
}

[data-theme="light"] .option {
    border-color: #e0e0e0;
}

[data-theme="dark"] .option {
    border-color: #4b5563;
}

.option:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.option input[type="radio"] {
    display: none;
}

.radio-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--dark-text);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 10px;
    flex-shrink: 0;
}

.option label {
    flex-grow: 1;
    font-size: 1rem;
    color: var(--dark-text);
    cursor: pointer;
    /* margin-left: 0; */ /* 调整对齐 */
}





[data-theme="light"] .option::before {
    border-color: var(--primary-color);
}

[data-theme="dark"] .option::before {
    border-color: var(--secondary-color);
}









.quiz-feedback, .answer-feedback {
    margin-top: 15px;
    padding: 10px;
    border-radius: 8px;
    background-color: var(--background-color) !important;
    border: 1px solid #e0e0e0;
}

[data-theme="light"] .quiz-feedback, [data-theme="light"] .answer-feedback {
    border-color: #e0e0e0;
}

[data-theme="dark"] .quiz-feedback, [data-theme="dark"] .answer-feedback {
    border-color: #4b5563;
}

.quiz-feedback:empty, .answer-feedback:empty {
    display: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header h1 { font-size: 1.8rem; }
    .subtitle { font-size: 1rem; }
    .powered-by { font-size: 0.9rem; }
    .learning-nav button {
        min-width: 100px;
        padding: 10px;
        font-size: 0.9rem;
    }
    .scenario-card { width: 150px; }
    .option { padding: 10px; }
    .option label { font-size: 0.95rem; }
}

@media (max-width: 576px) {
    #decision-tree-course { padding: 15px; }
    header h1 { font-size: 1.8rem; }
}

/*垃圾代码到此 ############################################################################################################################################### */

#display-text {
    margin-top: 20px;
    padding: 10px;
    border: 1px solid var(--primary-color);
    border-radius: var(--border-radius);
    background-color: #ffffff;
}