@font-face{font-family:Geist;src:url(../fonts/Geist-Regular.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap}@font-face{font-family:Geist;src:url(../fonts/Geist-Medium.woff2) format("woff2");font-weight:500;font-style:normal;font-display:swap}@font-face{font-family:Geist;src:url(../fonts/Geist-Semi.woff2) format("woff2");font-weight:600;font-style:normal;font-display:swap}:root{--canvas: #e6e1da;--paper: #f6f5f2;--ink: #121212;--muted: rgba(18, 18, 18, .55);--line: rgba(18, 18, 18, .18);--ease: cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;text-size-adjust:100%;touch-action:manipulation}html,body{width:100%;height:100%;margin:0;overflow:hidden}body{position:fixed;top:0;right:0;bottom:0;left:0;background:var(--canvas);color:var(--ink);font-family:Geist,PingFang SC,Hiragino Sans GB,sans-serif;user-select:none;-webkit-user-select:none;touch-action:manipulation}#app{display:flex;flex-direction:column;width:100%;height:100%;min-width:0;min-height:0;overflow:hidden;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}.topbar{display:flex;align-items:center;gap:8px;padding:10px 16px 4px;flex-wrap:wrap;min-width:0;max-width:100%}.topbar select{flex:1 1 140px;min-width:0;max-width:320px}.fold-toggles{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}.top-end{display:inline-flex;align-items:center;gap:6px;flex:0 0 auto}.fold-toggles button{display:inline-flex;align-items:center;gap:4px;max-width:148px}.fold-label{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.fold-mark{flex:none;font-size:11px;line-height:1;opacity:.72}.fold-toggles button.is-on{background:var(--ink);color:var(--paper)}.folds{flex:0 0 auto;min-width:0;max-width:100%}.fold{max-height:30vh;margin:4px 16px 0;padding:4px 0 8px;overflow:auto;border-bottom:1px solid var(--line)}.fold[hidden]{display:none}.fold-row{display:flex;flex-wrap:wrap;gap:8px}.piano-credit{margin:8px 0 0;color:var(--muted);font-size:11px}#foldDevice{display:flex;gap:8px;align-items:center}#foldDevice[hidden]{display:none}#foldDevice select{flex:1;min-width:0}.brand{display:flex;align-items:center;gap:8px;font-size:18px;font-weight:600;letter-spacing:-.03em}.hand-toggle{display:inline-flex;padding:3px;border:1px solid var(--ink);border-radius:999px;background:var(--paper)}.hand-toggle button{border-color:transparent;background:transparent;padding:6px 12px}.hand-toggle button.is-on{background:var(--ink);color:var(--paper)}.brand img{width:28px;height:28px;border-radius:8px;object-fit:cover;box-shadow:0 1px 2px #1212121f}.brand .sub{font-size:12px;font-weight:500;color:var(--muted);margin-left:8px;letter-spacing:0}.controls{display:flex;gap:8px;flex-wrap:wrap}select,button{background:transparent;color:var(--ink);border:1px solid var(--ink);border-radius:999px;padding:7px 12px;font-size:13px;font-weight:500;font-family:inherit;outline:none;transition:transform 90ms var(--ease),background-color .18s var(--ease),color .18s var(--ease)}select,input,textarea{font-size:16px}button{cursor:pointer}button[hidden]{display:none}button.primary{background:var(--ink);border-color:var(--ink);color:var(--paper);font-weight:600}button:active{transform:scale(.97)}button:focus-visible,select:focus-visible{outline:2px solid var(--ink);outline-offset:2px}select{background:var(--paper)}.statusbar{display:flex;gap:8px;padding:4px 0;flex-wrap:wrap}.stat{flex:1;min-width:90px;background:var(--paper);border:1px solid var(--ink);border-radius:12px;padding:8px 12px;display:flex;flex-direction:column;gap:2px}.stat[hidden]{display:none}.stat b{font-size:18px;font-weight:600;font-variant-numeric:tabular-nums}.stat span{font-size:11px;color:var(--muted)}.stage{flex:0 0 auto;height:clamp(220px,32vh,380px);position:relative;z-index:1;min-width:0;margin:0 16px 12px}.stage.is-game{height:clamp(260px,42vh,460px)}.sheet{position:relative;z-index:0;display:flex;flex-direction:column;flex:1 1 auto;min-width:0;min-height:120px;margin:6px 16px;overflow:auto;background:var(--paper);border:1px solid var(--line);border-radius:16px;box-shadow:0 10px 28px #1212120d}.sheet.is-compact{flex:0 0 auto;height:156px;min-height:140px;max-height:28%}#osmd{width:100%;min-width:0;max-width:100%;margin-top:auto;margin-bottom:auto}.sheet[hidden]{display:none}.sheet-wait{margin:0;padding:28px 16px;color:var(--muted);font-size:14px}.sheet #osmd svg{display:block;width:100%!important;min-width:0!important;max-width:100%!important;height:auto!important}.assignbar{padding:4px 0 0;display:flex;flex-direction:column;gap:6px}.assign-head{display:flex;align-items:baseline;gap:10px}.assign-head b{font-size:14px;font-weight:600}.assign-head span{font-size:12px;color:var(--muted)}.chips{display:flex;gap:8px;flex-wrap:wrap}.chip{background:transparent;border:1px solid var(--ink);border-radius:999px;padding:5px 12px;font-size:12px;color:var(--ink);cursor:pointer}.chip.done{background:var(--ink);color:var(--paper)}.chip.open{font-weight:600}.chip-sheet{margin-left:6px;padding:1px 7px;font-size:11px;border:1px solid currentColor;border-radius:999px;background:transparent;color:inherit;cursor:pointer}.chip-sheet:hover{background:#12121214}.chip.done .chip-sheet:hover{background:#f6f5f229}.assign-sheet{margin:8px 0 0;padding:8px;max-height:24vh;overflow:auto;background:var(--paper);border:1px solid var(--ink);border-radius:12px}.assign-sheet svg{max-width:100%;height:auto}.modal{position:fixed;top:0;right:0;bottom:0;left:0;background:#12121266;display:flex;align-items:center;justify-content:center;z-index:100}.modal[hidden]{display:none}.modal-card{background:var(--paper);border:1px solid var(--ink);border-radius:16px;padding:18px 22px;width:min(560px,92vw);max-height:80vh;overflow:auto}.modal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.stats-grid{display:flex;gap:10px;margin-bottom:10px}.stats-grid .stat{flex:1}.modal h4{margin:14px 0 8px;font-size:13px;font-weight:500;color:var(--muted)}table.history{width:100%;border-collapse:collapse;font-size:13px}table.history td{padding:6px 8px;border-bottom:1px solid var(--line)}#kb{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;display:block;border:1px solid var(--line);border-radius:16px;background:var(--canvas);box-shadow:0 10px 28px #1212120d;cursor:pointer;touch-action:none}.stage.is-game #kb{background:linear-gradient(180deg,#efeae3,#e4ddd4 72%,#ddd6cc)}.hintbar{flex:0 0 auto;min-width:0;max-width:100%;padding:4px 18px 2px;color:var(--muted);font-size:13px;font-variant-numeric:tabular-nums;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:color .18s var(--ease)}.hintbar.is-ok{color:#1b7f45}.hintbar.is-bad{color:#c62828;font-weight:600;white-space:normal}#stExpected,#stWrong,#stStreak{color:var(--ink)}.lesson-modes{position:relative;display:inline-flex;align-items:center;gap:0;margin:0;padding:4px;background:var(--paper);border:1px solid var(--ink);border-radius:999px;flex:0 0 auto}.mode-ind{position:absolute;top:4px;bottom:4px;left:0;border-radius:999px;background:var(--ink);pointer-events:none}.mode-ind.is-ready{transition:transform .22s var(--ease),width .22s var(--ease)}.lesson-mode{position:relative;z-index:1;background:transparent;border-color:transparent;color:var(--ink);padding:7px 12px}.lesson-mode:active{transform:none}.lesson-mode.is-on{background:transparent;border-color:transparent;color:var(--paper);font-weight:500}.coach{display:flex;align-items:center;gap:10px;margin:6px 16px 0;padding:6px 10px 6px 8px;background:var(--paper);border:1px solid var(--line);border-radius:16px;box-shadow:0 8px 24px #1212120d;flex:0 0 auto;min-width:0;max-width:calc(100% - 32px)}.coach-solfege{min-width:44px;height:44px;display:grid;place-items:center;border-radius:12px;background:var(--ink);color:var(--paper);font-size:16px;font-weight:600;letter-spacing:-.03em;flex:0 0 auto;transition:background-color .18s var(--ease),color .18s var(--ease)}.coach-copy{display:flex;flex-direction:column;gap:2px;min-width:0;flex:1}#hearBtn{align-self:flex-start;margin-top:4px;padding:4px 10px;font-size:13px}.coach-copy b{font-size:15px;font-weight:600;letter-spacing:-.02em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.coach:not(.is-open):not(.is-alert) .coach-copy span{display:none}.coach-copy span{color:var(--muted);font-size:13px;line-height:1.45;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:color .18s var(--ease)}.coach-copy span.is-swap{animation:coach-in .2s var(--ease)}@keyframes coach-in{0%{opacity:.25}to{opacity:1}}.coach.is-open .coach-copy b,.coach.is-open .coach-copy span,.coach.is-alert .coach-copy span{white-space:normal}.coach.is-alert .coach-copy span{color:#c62828;font-weight:600}.lesson-result{position:fixed;top:0;right:0;bottom:0;left:0;z-index:90;display:flex;align-items:center;justify-content:center;background:#12121266}.lesson-result[hidden]{display:none}.lesson-result-card{width:min(440px,92vw);padding:28px 28px 22px;border-radius:16px;background:var(--paper);border:1px solid var(--ink);text-align:center}.lesson-kicker{margin:0;color:var(--muted);letter-spacing:.14em;font-size:12px;font-weight:500}.lesson-result-card h2{margin:8px 0 0;font-size:32px;font-weight:600;letter-spacing:-.03em}.lesson-stars{display:flex;justify-content:center;gap:8px;margin:14px 0;font-size:28px;color:#12121238}.lesson-stars .is-on{color:var(--ink)}.lesson-result-card p{margin:0;color:var(--muted)}.lesson-result-actions{display:flex;justify-content:center;gap:8px;margin-top:18px}.lang-sel{height:32px;border:0;border-radius:8px;background:transparent;color:var(--ink);font:inherit;max-width:7.2rem}.ded-banner{display:block;width:calc(100% - 24px);margin:0 12px 4px;padding:6px 12px;border:0;border-radius:10px;background:var(--paper);color:var(--ink);font:inherit;font-size:14px;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;box-shadow:0 1px #1212120f}.world-lead{margin:0 0 12px;color:var(--muted);line-height:1.45}.world-field{display:flex;flex-direction:column;gap:4px;margin:0 0 10px;font-size:13px;color:var(--muted)}.world-field input,.world-field select{height:40px;border:1px solid var(--line);border-radius:10px;padding:0 10px;background:#fff;color:var(--ink);font:inherit;font-size:16px;user-select:text;-webkit-user-select:text}.world-warn{color:#9b2c2c;margin:0 0 8px}.lang-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.lang-pick{height:42px;border:1px solid var(--line);border-radius:10px;background:#fff;font:inherit}.method-list{display:flex;flex-direction:column;gap:12px;max-height:60vh;overflow:auto}.method-card{display:grid;grid-template-columns:112px 1fr;gap:10px;align-items:center}.method-card img{width:112px;height:76px;object-fit:cover;border-radius:10px}.method-card b{display:block}.method-card span,.method-card p{display:block;margin:2px 0 0;color:var(--muted);font-size:13px}.method-card button{margin-top:6px}#worldCard{max-width:520px;width:min(520px,calc(100vw - 32px));max-height:calc(100vh - 48px);overflow:auto}.who-btn{display:inline-flex;align-items:center;gap:6px;height:32px;padding:0 8px 0 2px;border:0;border-radius:999px;background:var(--paper);color:var(--ink);font:inherit;font-size:14px}.who-btn span{max-width:6rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.avatar-grid,.badge-row{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0 12px}.avatar-pick{width:48px;height:48px;padding:0;border:2px solid transparent;border-radius:14px;background:#fff}.avatar-pick.is-on,.lang-pick.is-on{border-color:var(--green, #1b7f45)}.badge{padding:4px 8px;border-radius:999px;background:#e7f4ec;color:#1b7f45;font-size:13px}.diary{margin:6px 0 12px;padding-left:18px;color:var(--ink);font-size:14px}.diary li{margin:4px 0}@media(max-height:640px){.topbar{padding-top:6px}.coach{margin-top:4px;padding:4px 8px}.coach-solfege{min-width:36px;height:36px;font-size:15px}.sheet{min-height:96px}.stage{height:clamp(150px,30vh,220px)}.stage.is-game{height:clamp(180px,38vh,260px)}}