:root{font-family:Segoe UI,Hiragino Kaku Gothic ProN,Hiragino Sans,Yu Gothic,Meiryo,sans-serif;color:#112;background:linear-gradient(140deg,#eef6ff,#f6f9f1)}*{box-sizing:border-box}html{background:radial-gradient(circle at top left,rgba(146,191,255,.28),transparent 28%),linear-gradient(180deg,#f2f6fb,#eef3f8)}body{margin:0}.app-shell{min-height:100vh;max-width:1360px;margin:0 auto;padding:24px;display:grid;grid-template-rows:auto 1fr auto;gap:16px}.app-shell__header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 28px;border:1px solid rgba(142,161,189,.5);border-radius:24px;background:#ffffffe6;box-shadow:0 20px 40px #394c6814}.app-shell__header h1{margin:0;font-size:clamp(2rem,4vw,2.8rem)}.app-shell__eyebrow{margin:0 0 6px;color:#5e6d88;font-size:.75rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase}.app-shell__body{display:grid;grid-template-columns:minmax(300px,360px) minmax(0,1fr);gap:16px;align-items:start}.app-shell__sidebar{display:grid;gap:16px}.app-shell__compatibility-badge{display:inline-flex;align-items:center;padding:7px 12px;border-radius:999px;font-size:.84rem;font-weight:700;white-space:nowrap}.app-shell__compatibility-badge--ready{background:#e4f7ea;color:#1f7a3d}.app-shell__compatibility-badge--fallback{background:#fff1df;color:#9a5b11}a{color:#1657b8}section{border:1px solid rgba(142,161,189,.45);border-radius:24px;margin:0;padding:20px;background:#ffffffeb;box-shadow:0 18px 32px #394c680f}.step-panel__header{display:flex;align-items:center;justify-content:space-between;gap:12px}.step-panel__header h2{margin:0}.step-panel__summary{margin:8px 0 0;color:#334}.step-panel__summary span{display:block;margin-top:4px;font-size:.9rem;color:#66738a}.drop-zone{transition:border-color .12s ease,background-color .12s ease}.drop-zone--active{border-color:#2e6bc6;background:#f0f6ff}article{border-top:1px dashed #ccd;padding:12px 0}button{margin-right:8px}.import-panel__privacy,.import-panel__hint,.import-panel__notice,.practice-panel__placeholder{line-height:1.6}.import-panel__notice{margin:8px 0 0;color:#8a4d13;font-size:.92rem;font-weight:700}.separate-panel__details{margin:16px 0 0;display:grid;gap:12px}.separate-panel__details div{padding:12px 14px;border-radius:14px;background:#f6f9fd}.separate-panel__details dt{margin-bottom:4px;color:#5e6d88;font-size:.82rem;font-weight:700}.separate-panel__details dd{margin:0;color:#22324b}.practice-panel{min-height:100%;display:grid;align-content:start;gap:18px;padding:24px}.import-panel__separate{margin-top:16px}.separate-panel{display:grid;gap:12px}.separate-panel__actions{display:flex;justify-content:flex-end}.separate-panel__cancel-button{margin-right:0}.practice-panel__header h2,.practice-panel>h2{margin:0;font-size:clamp(1.35rem,2.4vw,2rem)}.practice-panel__eyebrow{margin:0 0 6px;color:#5e6d88;font-size:.75rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase}.practice-panel__placeholder{min-height:320px;display:grid;place-items:center;border:1px dashed #c7d2e4;border-radius:18px;background:linear-gradient(180deg,#fbfcff,#f4f8fd);color:#5b6880;text-align:center;padding:24px}.app-footer{padding:18px 20px 20px;border:1px solid #d6dfef;border-radius:24px;background:linear-gradient(180deg,#f6f8fc,#edf2fa);color:#23324d;font-size:.88rem;box-shadow:inset 0 1px #ffffffb3}.app-footer__eyebrow{margin:0 0 6px;color:#5e6d88;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.app-footer h2{margin:0 0 12px;font-size:.98rem}.app-footer p{margin:8px 0;line-height:1.6}.app-footer__links{display:flex;gap:16px;flex-wrap:wrap;padding-left:18px;margin:12px 0 0}.separate-panel__description,.separate-panel__status{line-height:1.5}.separate-panel__progress-row{margin-top:12px}.separate-panel__progress-row p{margin:0 0 6px}.separate-panel__progress-row progress{width:100%;height:14px}.separate-panel__apply-button{margin-top:16px}.saved-library__header{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}.saved-library__header h2,.saved-library__item h3{margin-top:0}.saved-library__quota,.saved-library__status{line-height:1.5}.saved-library__item{border-top:1px dashed #ccd;padding-top:12px}.saved-library__item--active{background:linear-gradient(180deg,#f4f8ff,#fff);border-radius:16px;padding:12px}.saved-library__actions{display:flex;flex-wrap:wrap;gap:8px}.practice-player__seekbar{width:100%}.practice-player__transport,.practice-player__shortcuts{display:flex;flex-wrap:wrap;gap:8px}.practice-player__transport{margin-bottom:12px}.practice-player__shortcuts{margin:16px 0 8px}.practice-player__stem-header{display:flex;align-items:center;gap:10px}.practice-player__stem-header h3{margin:0}.practice-player__audibility-badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:999px;font-size:.78rem;font-weight:700;letter-spacing:.01em}.practice-player__audibility-badge--audible{background:#e4f7ea;color:#1f7a3d}.practice-player__audibility-badge--muted{background:#fde8e7;color:#b33a32}@media(max-width:960px){.app-shell{padding:16px}.app-shell__body{grid-template-columns:1fr}.app-shell__header{align-items:flex-start;flex-direction:column}.practice-panel__placeholder{min-height:200px}}