*{box-sizing:border-box}
body{margin:0;background:#eef5fb;font-family:"Microsoft YaHei",Arial}
.app{max-width:900px;margin:auto;padding:20px}
header{background:#1261a0;color:white;padding:20px;border-radius:16px;text-align:center}
.card,.question{background:white;padding:22px;margin:18px 0;border-radius:14px;box-shadow:0 4px 15px #d5dbe2}
button{background:#1261a0;color:white;border:0;padding:12px 35px;border-radius:8px;font-size:16px}
.option{display:block;margin:12px 0}
.hidden{display:none}
.progress{font-size:14px;color:#666}