* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    font-family: system-ui, sans-serif;
    /* 使用你的背景图片bg.jpg，半透明遮罩 */
    background: linear-gradient(rgba(0, 0, 0, 0.38), rgba(0, 0, 0, 0.38)), url("./bg.jpg");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding:30px 15px;
}

.container {
    max-width:440px;
    margin:0 auto;
}

h1 {
    text-align:center;
    margin-bottom:26px;
    font-size:26px;
    color:#ffffff;
    text-shadow:0 2px 8px rgba(0,0,0,0.4);
}

.block {
    background-color:rgba(0,0,0,0.45);
    padding:26px;
    border-radius:14px;
    box-shadow:0 4px 16px rgba(0,0,0,0.35);
}

.info-bar{
    display:flex;
    justify-content:space-between;
    align-items:center;
    margin-bottom:16px;
}
.info-bar span{
    color:#fff;
    font-size:18px;
}
#startBtn{
    padding:7px 18px;
    border:none;
    border-radius:9px;
    background:rgba(126,232,179,0.85);
    color:#000;
    font-size:15px;
    cursor:pointer;
    transition:0.24s;
}
#startBtn:hover{
    background:rgba(126,232,179,1);
}

#gameCanvas{
    width:100%;
    border-radius:10px;
    border:1px solid rgba(255,255,255,0.15);
    display:block;
}

.tip{
    color:#cccccc;
    font-size:14px;
    text-align:center;
    margin:14px 0 20px;
}

/* 手机方向按键布局 */
.mobile-ctrl{
    display:grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap:10px;
    max-width:240px;
    margin:0 auto 28px;
}
.mobile-ctrl button{
    width:60px;
    height:60px;
    font-size:24px;
    border-radius:10px;
    border:none;
    background:rgba(255,255,255,0.14);
    color:#fff;
    cursor:pointer;
    transition:0.22s;
}
.mobile-ctrl button:active{
    background:rgba(255,255,255,0.32);
}

.back-home{
    display:block;
    text-align:center;
    color:#8ec8ff;
    text-decoration:none;
}
.back-home:hover{
    color:#b3d8ff;
    text-decoration:underline;
}