:root{color:#1a1f2e;background:#f4f6fb;font-family:Segoe UI,system-ui,sans-serif;line-height:1.5;font-weight:400}*{box-sizing:border-box}body{margin:0;min-height:100vh}#root{min-height:100vh}.app{min-height:100vh;display:flex;flex-direction:column;padding-bottom:12rem}.header{padding:1.5rem 1.25rem .5rem;text-align:center}.header h1{margin:0;font-size:1.75rem}.subtitle{margin:.35rem 0 0;color:#5b6478}.main{width:min(640px,100%);margin:0 auto;padding:1rem 1.25rem 2rem;display:grid;gap:1rem}.question-card,.history-card{background:#fff;border:1px solid #dbe1ee;border-radius:14px;padding:1.25rem;box-shadow:0 8px 24px #1a1f2e0f}.skill-badge{display:inline-block;padding:.25rem .65rem;border-radius:999px;background:#e8eefc;color:#2f4db8;font-size:.85rem;font-weight:600}.question-text{margin:1rem 0 1.25rem;font-size:2rem;font-weight:700}.answer-form label{display:block;margin-bottom:.35rem;font-size:.9rem;color:#5b6478}.answer-row{display:flex;gap:.75rem}.answer-row input{flex:1;padding:.65rem .75rem;border:1px solid #c8d0e0;border-radius:10px;font-size:1rem}.answer-row input:focus{outline:2px solid #6b8cff;border-color:#6b8cff}.answer-row button{padding:.65rem 1.1rem;border:none;border-radius:10px;background:#3b5bdb;color:#fff;font-size:1rem;font-weight:600;cursor:pointer}.answer-row button:disabled{opacity:.55;cursor:not-allowed}.feedback{margin:1rem 0 0;font-weight:600}.history-card h2{margin:0 0 .75rem;font-size:1rem}.history-list{list-style:none;margin:0;padding:0;display:grid;gap:.55rem}.history-list li{display:flex;justify-content:space-between;gap:.75rem;align-items:center;padding:.55rem 0;border-bottom:1px solid #edf1f8}.history-list li:last-child{border-bottom:none}.tag{font-size:.8rem;font-weight:700;padding:.15rem .5rem;border-radius:999px}.tag.ok{background:#e6f7ed;color:#1f7a45}.tag.miss{background:#fdecec;color:#b42318}.prediction-bar{position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid #dbe1ee;box-shadow:0 -8px 24px #1a1f2e14;padding:1rem 1.25rem 1.25rem}.prediction-summary{width:min(640px,100%);margin:0 auto .85rem}.prediction-title{margin:0;font-size:.85rem;text-transform:uppercase;letter-spacing:.04em;color:#5b6478}.prediction-value{margin:.2rem 0 0;font-size:1.05rem}.skill-bars{width:min(640px,100%);margin:0 auto;display:grid;gap:.55rem}.skill-bar-label{display:flex;justify-content:space-between;font-size:.85rem;margin-bottom:.2rem}.skill-bar-track{height:.55rem;background:#e8edf7;border-radius:999px;overflow:hidden}.skill-bar-fill{height:100%;background:linear-gradient(90deg,#6b8cff,#3b5bdb);border-radius:999px;transition:width .25s ease}.loading,.error,.muted{color:#5b6478}.error{color:#b42318}.baseline-note{margin:.35rem 0 0;font-size:.85rem}@media(max-width:520px){.question-text{font-size:1.6rem}.answer-row{flex-direction:column}}