:root{--primary: #6c5ce7;--primary-light: #a29bfe;--success: #00b894;--warning: #fdcb6e;--danger: #e17055;--bg: #0f0f1a;--bg-card: #1a1a2e;--bg-card-hover: #222240;--text: #e0e0e0;--text-muted: #888;--border: #333}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}#root{min-height:100vh;display:flex;flex-direction:column}.app{max-width:720px;margin:0 auto;padding:2rem 1rem;min-height:100vh;display:flex;flex-direction:column}.app-header{text-align:center;margin-bottom:2rem}.app-header h1{font-size:2.2rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--primary-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.app-header p{color:var(--text-muted);margin-top:.25rem;font-size:.95rem}.challenge-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:1.5rem;margin-bottom:1.5rem}.challenge-card .label{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:.5rem}.challenge-text{font-size:1.35rem;line-height:1.6;font-weight:400;letter-spacing:.01em}.difficulty-selector{display:flex;gap:.5rem;margin-top:1rem}.difficulty-btn{padding:.35rem .85rem;border-radius:20px;border:1px solid var(--border);background:transparent;color:var(--text-muted);font-size:.8rem;cursor:pointer;transition:all .2s}.difficulty-btn:hover{border-color:var(--primary-light);color:var(--text)}.difficulty-btn.active{background:var(--primary);border-color:var(--primary);color:#fff}.controls{display:flex;gap:.75rem;margin-bottom:1.5rem}.btn{flex:1;padding:.85rem 1.2rem;border-radius:10px;border:none;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:.5rem}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-light)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--bg-card);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-card-hover)}.btn-recording{background:var(--danger);color:#fff;animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.transcript-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:1.5rem;margin-bottom:1.5rem}.transcript-card .label{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:.5rem}.transcript-text{font-size:1.1rem;line-height:1.6;min-height:2rem;color:var(--text-muted)}.transcript-text.has-text{color:var(--text)}.diff-view{font-size:1.2rem;line-height:1.8}.diff-view .word{display:inline;padding:.1em .15em;border-radius:3px}.diff-view .word.correct{color:var(--success)}.diff-view .word.missing{color:var(--warning);opacity:.6;font-style:italic}.score-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:1.5rem;margin-bottom:1.5rem;text-align:center}.score-display{display:flex;justify-content:center;align-items:center;gap:2rem;margin-top:.75rem}.score-circle{width:100px;height:100px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.8rem;font-weight:700;border:4px solid}.score-circle.high{border-color:var(--success);color:var(--success)}.score-circle.medium{border-color:var(--warning);color:var(--warning)}.score-circle.low{border-color:var(--danger);color:var(--danger)}.score-details{text-align:left}.score-details p{color:var(--text-muted);font-size:.9rem;margin-bottom:.25rem}.score-details span{color:var(--text);font-weight:600}.history-section{margin-top:auto;padding-top:1.5rem}.history-section h3{font-size:.85rem;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);margin-bottom:.75rem}.history-list{display:flex;flex-direction:column;gap:.5rem}.history-item{display:flex;justify-content:space-between;align-items:center;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;padding:.65rem 1rem;font-size:.85rem}.history-item .history-text{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-right:1rem;color:var(--text-muted)}.history-item .history-score{font-weight:700;min-width:3rem;text-align:right}.unsupported{text-align:center;padding:3rem 1rem}.unsupported h2{color:var(--danger);margin-bottom:1rem}.unsupported p{color:var(--text-muted)}@media(max-width:480px){.app{padding:1rem .75rem}.challenge-text{font-size:1.15rem}.score-display{flex-direction:column;gap:1rem}}