*{box-sizing:border-box}body{margin:0;font-family:system-ui,"Noto Sans TC","Noto Sans JP",sans-serif;background:#f6f5f2;color:#222}
header{background:#b33;color:#fff;padding:.6rem 1rem}h1{margin:0;font-size:1.2rem}
nav{display:flex;overflow-x:auto;background:#fff;border-bottom:1px solid #ddd;position:sticky;top:0}
nav button{flex:1;padding:.8rem .5rem;border:0;background:none;font-size:1rem;white-space:nowrap}nav button.on{border-bottom:3px solid #b33;font-weight:bold}
main{max-width:680px;margin:auto;padding:1rem}.card{background:#fff;border-radius:12px;padding:1rem;margin-bottom:1rem;box-shadow:0 1px 3px #0002}
.big{font-size:2.4rem;text-align:center;margin:.5rem 0}.sub{color:#666}.row{display:flex;gap:.5rem;flex-wrap:wrap}
.btn{padding:.7rem 1rem;border:1px solid #b33;border-radius:8px;background:#fff;color:#b33;font-size:1rem}.btn.p{background:#b33;color:#fff}
.opt{display:block;width:100%;text-align:left;padding:.8rem;margin:.4rem 0;border:1px solid #ccc;border-radius:8px;background:#fff;font-size:1rem}
.opt.ok{background:#dfd;border-color:#3a3}.opt.ng{background:#fdd;border-color:#c33}.fb{margin-top:.6rem;padding:.6rem;border-radius:8px;background:#f3f3f3}
.passage{line-height:1.9;font-size:1.05rem}ruby rt{font-size:.6em;color:#777}