body {
    font-family: Arial, sans-serif;
    margin: 20px;
}

h1 {
    text-align: center;
    font-size: 1.5rem;
}

.btn-group {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.main-btn {
    font-size: 1.1rem;
    padding: 14px 20px;
    border: none;
    border-radius: 8px;
    background-color: #007bff;
    color: white;
    cursor: pointer;
    min-width: 120px;
    transition: background 0.3s;
}

.main-btn:hover {
    background-color: #0056b3;
}

.main-btn:active {
    background-color: #003f82;
}

.main-btn-link {
    text-decoration: none;
}

/* 表格 */
table {
    border-collapse: collapse;
    width: 100%;
    margin-top: 10px;
    font-size: 0.9rem;
}

th,
td {
    border: 1px solid #ccc;
    padding: 8px;
    text-align: left;
    cursor: pointer;
}

th {
    background: #f2f2f2;
}

th.sorted-asc::after {
    content: " ↑";
}

th.sorted-desc::after {
    content: " ↓";
}

tr:hover {
    background: #f9f9f9;
}

td.num {
    text-align: right;
}

/* 适配小屏幕 */
@media (max-width: 600px) {
    .btn-group {
        flex-direction: column;
        align-items: center;
    }

    .main-btn {
        width: 80%;
        font-size: 1.2rem;
        padding: 16px;
    }
}