* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", sans-serif;
}
body {
    background: #f5f7fa;
    padding: 20px;
}
.auth-box {
    max-width: 400px;
    margin: 80px auto;
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}
.tab {
    display: flex;
    margin-bottom: 25px;
    border-bottom: 1px solid #eee;
}
.tab-item {
    flex: 1;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
    color: #666;
    position: relative;
}
.tab-item.active {
    color: #409eff;
    font-weight: bold;
}
.tab-item.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: #409eff;
}
.form input {
    width: 100%;
    height: 44px;
    padding: 0 15px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}
.btn {
    width: 100%;
    height: 44px;
    background: #409eff;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    cursor: pointer;
    transition: 0.2s;
}
.btn:hover {
    background: #337ecc;
}
.msg {
    margin-top: 15px;
    text-align: center;
    font-size: 14px;
    color: #f56c6c;
}
.player-wrap {
    max-width: 800px;
    margin: 30px auto;
}