:root{font-family:system-ui,sans-serif;color:#17324d;background:#f5f7f9}*{box-sizing:border-box}body{margin:0}main{max-width:640px;margin:auto;padding:16px}header{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}h1{font-size:1.35rem;margin:0}button,input{font:inherit;border:1px solid #b8c5d0;border-radius:10px;padding:10px;background:white}button{cursor:pointer;color:#17324d}nav{display:flex;gap:4px}.card{background:white;border-radius:16px;padding:20px;margin:18px 0;box-shadow:0 2px 10px #17324d18}.prompt{font-size:1.4rem;line-height:1.6}.muted{color:#617384}.answer{margin-top:12px;width:100%}.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.wrong{border-left:4px solid #d86b4d;padding-left:12px}.word-row{border-top:1px solid #dbe2e8;padding:14px 0}.word-row h3{margin:0 0 5px}.danger{color:#a33}.ok{color:#176b4b}.right-answer{color:#16803c;font-weight:700}.wrong-answer{color:#c93636;font-weight:700}@media(max-width:400px){main{padding:12px}header{display:block}nav{margin-top:10px}.prompt{font-size:1.2rem}}