:root{color:#292524;background:#f5f5f5;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button{font:inherit}.practice-room{min-height:100vh;background:#f5f5f5;color:#292524}.practice-shell{display:grid;gap:18px;width:min(100%,1080px);margin:0 auto;padding:18px 16px max(24px,env(safe-area-inset-bottom))}.file-status,.score-uploader,.part-mapper,.practice-stage,.report-panel{background:#fff;border:1px solid #e7e5e4;border-radius:8px}.file-status{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;padding:18px}.section-kicker{margin:0 0 6px;color:#777169;font-size:.74rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}h1,h2,p{margin:0}h1{color:#0c0a09;font-family:Georgia,Times New 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