/* 基础重置 */
* {
    box-sizing: border-box;
}
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 15px;
    font-size: 16px; /* 手机端基础字体16px */
    line-height: 1.5;
    background-color: #f9f9f9;
    color: #333;
}

/* 标题 */
h1 {
    font-size: 1.8rem;
    margin-top: 0;
}
h2 {
    font-size: 1.5rem;
}

/* 表单元素 */
form {
    max-width: 100%;
    background: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
label {
    display: block;
    font-weight: bold;
    margin-top: 10px;
}
input[type="text"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 12px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 16px;
    background-color: #fff;
}
button, .button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 15px;
    width: 100%; /* 手机端按钮全宽 */
    text-align: center;
    display: inline-block;
    text-decoration: none;
}
button:hover, .button:hover {
    background-color: #0056b3;
}

/* 链接按钮（如返回首页） */
a {
    color: #007bff;
    text-decoration: none;
}
a.button {
    background-color: #6c757d;
    margin-right: 5px;
}
a.button:hover {
    background-color: #5a6268;
}

/* 表格 */
table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin: 15px 0;
}
th, td {
    padding: 12px 8px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}
th {
    background-color: #f4f4f4;
    font-weight: bold;
}
tr:last-child td {
    border-bottom: none;
}

/* 表格在小屏幕上横向滚动 */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 15px 0;
}
.table-responsive table {
    min-width: 600px; /* 当宽度不足时出现滚动条 */
}

/* 消息提示 */
.success {
    color: #155724;
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    padding: 12px;
    border-radius: 6px;
    margin: 15px 0;
}
.error {
    color: #721c24;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: 12px;
    border-radius: 6px;
    margin: 15px 0;
}

/* 导航链接区域 */
.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0;
}
.nav-links a {
    flex: 1 1 auto;
    background-color: #007bff;
    color: white;
    padding: 12px 10px;
    border-radius: 6px;
    text-align: center;
    min-width: 120px;
}

/* 针对特别小的屏幕进一步调整 */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    h1 {
        font-size: 1.5rem;
    }
    .nav-links a {
        flex: 1 1 100%; /* 导航按钮堆叠 */
    }
    button, .button {
        padding: 14px; /* 更大的点击区域 */
    }
}