body {
    font-family: 'SimSun', serif;
    background: url('img/shanghai.jpg') no-repeat center center fixed;
    background-size: cover;
    color: #333;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* 固定按钮的样式 */
.theme-buttons {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.8); /* 半透明白色背景 */
    padding: 10px;
    display: flex;
    justify-content: center;
    z-index: 1000; /* 确保按钮在最上层 */
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2); /* 微弱阴影 */
}

.theme-buttons button {
    background-color: #c0392b; /* 红色 */
    color: #fff; /* 白色文字 */
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    margin: 0 10px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
    font-size: 16px;
}

.theme-buttons button:hover {
    background-color: #e74c3c; /* 更亮的红色 */
    transform: scale(1.05);
}

.container {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 1200px;
    background: rgba(255, 255, 255, 0.7); /* 半透明白色背景 */
    border-radius: 15px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2); /* 微弱阴影 */
    padding: 20px;
    margin-top: 60px; /* 确保内容不被按钮覆盖 */
}

header {
    background: #f5f5f5; /* 浅灰色背景 */
    padding: 15px;
    text-align: center;
    border-bottom: 2px solid #e0e0e0; /* 浅灰色底边 */
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1); /* 微弱阴影 */
}

header h1 {
    margin: 0;
    font-size: 28px;
    font-weight: 700;
    color: #c0392b; /* 红色 */
}

header h2 {
    margin: 5px 0;
    font-size: 18px;
    font-weight: 400;
    color: #666;
}

.main-content {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.form-container, .result-container {
    flex: 1;
    padding: 20px;
    background: rgba(250, 250, 250, 0.7); /* 半透明极浅灰色背景 */
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* 微弱阴影 */
}

.form-container {
    margin-right: 20px;
}

.result-container {
    margin-left: 20px;
}

.form-group {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.form-group div {
    flex: 1;
    margin-right: 20px;
}

.form-group div:last-child {
    margin-right: 0;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 5px;
    color: #c0392b; /* 红色 */
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid rgba(221, 221, 221, 0.7); /* 半透明浅灰色边框 */
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.7); /* 半透明白色背景 */
    color: #333;
    box-sizing: border-box;
}

.button {
    font-size: 16px;
    padding: 10px 20px;
    width: 100%;
    max-width: 200px;
    background-color: #c0392b; /* 红色 */
    color: #fff; /* 白色文字 */
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
    margin: 20px 0;
    display: block;
    align-self: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* 微弱阴影 */
}

.button:hover {
    background-color: #e74c3c; /* 更亮的红色 */
    transform: scale(1.05);
}

.result-container h2 {
    margin: 10px 0;
    font-size: 16px;
    color: #333;
}