* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: system-ui, sans-serif;
}
body {
    max-width: 700px;
    margin: 30px auto;
    padding: 0 20px;
}
.block {
    margin: 20px 0;
    padding: 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
}
button {
    padding: 10px 18px;
    cursor: pointer;
    border: none;
    border-radius: 6px;
    background: #3677ff;
    color: #fff;
    font-size: 15px;
}
button:disabled {
    background: #99b8f0;
    cursor: not-allowed;
}
.btn-abandon {
    background: #f04848;
}
input[type="number"] {
    width: 100%;
    padding: 10px;
    margin: 12px 0;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 6px;
}
.tip {
    font-size: 16px;
    font-weight: bold;
    margin: 10px 0;
}
.hidden {
    display: none;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}
td, th {
    border: 1px solid #eee;
    padding: 8px;
    font-size: 14px;
}
.song-item {
    margin: 12px 0;
    padding: 10px;
    border: 1px solid #eee;
    border-radius: 6px;
}
.dev-info {
    margin-top: 40px;
    text-align: center;
    font-size: 13px;
    color: #666;
}
.dev-info a {
    color: #3677ff;
    text-decoration: none;
}
#gameHint {
    font-weight:normal;
    font-size:14px;
}
.intro-wrap {
    background: #f8f9fa;
    padding: 14px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #eee;
}
.intro-wrap h2 {
    margin: 0 0 8px 0;
    font-size: 22px;
}
.intro-wrap p {
    line-height: 1.6;
    font-size: 15px;
    color: #333;
    margin: 6px 0;
}