/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background-color: #f0f8ff;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 2px solid #3498db;
    margin-bottom: 20px;
}

header h1 {
    color: #2c3e50;
    font-size: 28px;
}

.score-container, .level-container {
    background-color: #3498db;
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: bold;
}

/* 主要游戏区域 */
.game-container {
    display: flex;
    height: 70vh;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

#molecule-canvas {
    flex: 7;
    background-color: #ecf0f1;
    position: relative;
}

.controls-panel {
    flex: 3;
    padding: 20px;
    background-color: #f9f9f9;
    border-left: 1px solid #ddd;
    display: flex;
    flex-direction: column;
}

/* 元素列表 */
.elements-container {
    margin-bottom: 20px;
}

.elements-container h3 {
    color: #2c3e50;
    margin-bottom: 10px;
    padding-bottom: 5px;
    border-bottom: 1px solid #ddd;
}

#elements-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.element-item {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: white;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    user-select: none;
}

.element-item:hover {
    transform: scale(1.1);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

/* 元素颜色 */
.element-H { background-color: #FFFFFF; color: #333; border: 1px solid #ddd; }
.element-C { background-color: #909090; }
.element-N { background-color: #3050F8; }
.element-O { background-color: #FF0D0D; }
.element-F { background-color: #90E050; }
.element-P { background-color: #FF8000; }
.element-S { background-color: #FFFF30; color: #333; }
.element-Cl { background-color: #1FF01F; }

/* 挑战容器 */
.challenge-container {
    margin-bottom: 20px;
}

.challenge-container h3 {
    color: #2c3e50;
    margin-bottom: 10px;
    padding-bottom: 5px;
    border-bottom: 1px solid #ddd;
}

#current-challenge {
    background-color: #e8f4fc;
    padding: 15px;
    border-radius: 5px;
    border-left: 4px solid #3498db;
}

/* 按钮容器 */
.buttons-container {
    margin-top: auto;
    display: flex;
    gap: 10px;
}

button {
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

#reset-btn {
    background-color: #e74c3c;
    color: white;
}

#submit-btn {
    background-color: #2ecc71;
    color: white;
}

#hint-btn {
    background-color: #f39c12;
    color: white;
}

button:hover {
    opacity: 0.9;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
}

.modal-content {
    background-color: white;
    margin: 10% auto;
    padding: 30px;
    width: 60%;
    max-width: 600px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
}

.modal h2 {
    color: #2c3e50;
    margin-bottom: 20px;
}

.modal h3 {
    color: #3498db;
    margin: 15px 0 10px;
}

.modal p, .modal li {
    margin-bottom: 10px;
}

.modal ul {
    padding-left: 20px;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: #333;
}

#start-game-btn, #next-level-btn {
    background-color: #3498db;
    color: white;
    padding: 12px 20px;
    margin-top: 20px;
    display: block;
    width: 100%;
    font-size: 16px;
}

/* 页脚样式 */
footer {
    text-align: center;
    margin-top: 30px;
    padding: 15px 0;
    color: #7f8c8d;
    font-size: 14px;
    border-top: 1px solid #ddd;
}