:root{color-scheme:light;--bg: #f4f7fb;--panel: #ffffff;--ink: #1d2530;--muted: #697386;--line: #d9e1ec;--accent: #1b8a7a;--accent-strong: #0f6e62;--warn: #d95f3d;--key: #ffffff;--key-shadow: #b7c4d4;--left-index: #4f80ff;--left-middle: #7b61ff;--left-ring: #b45ad4;--left-pinky: #c1488b;--right-index: #19a974;--right-middle: #e0a300;--right-ring: #e56b6f;--right-pinky: #2b9fd8}*{box-sizing:border-box}body{margin:0;min-height:100vh;overflow:hidden;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input{font:inherit}.app-shell{width:min(1160px,calc(100vw - 32px));height:100svh;margin:0 auto;padding:14px 0;display:grid;grid-template-rows:auto auto auto minmax(0,1fr);gap:10px}.topbar,.practice-panel,.stats-row,.keyboard-section{background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:0 16px 36px #23365214}.topbar{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:14px 20px}.eyebrow{margin:0 0 4px;color:var(--accent-strong);font-size:.78rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}h1,h2,p{margin:0}h1{font-size:clamp(1.35rem,2.6vw,1.9rem)}.header-controls{display:flex;align-items:end;gap:10px}.lesson-picker{display:grid;gap:4px;color:var(--muted);font-size:.82rem;font-weight:800}#modeSelect{min-width:260px;height:40px;border:1px solid var(--accent);border-radius:8px;background:#e8f7f4;color:var(--accent-strong);cursor:pointer;padding:0 12px;font-weight:800}.secondary-button{min-height:40px;border:1px solid var(--line);border-radius:8px;background:#f9fbfd;color:var(--ink);cursor:pointer;padding:0 14px;font-weight:700}.compact-button{min-height:40px;white-space:nowrap}.secondary-button:hover{border-color:var(--accent);background:#e8f7f4;color:var(--accent-strong)}.practice-panel{display:grid;grid-template-columns:1fr 360px;gap:18px;padding:16px 20px}.prompt-area{min-width:0}.prompt-meta{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-weight:700;font-size:.95rem}.prompt{min-height:92px;display:flex;justify-content:center;align-items:center;flex-wrap:wrap;font-size:clamp(3.4rem,8vw,6rem);font-weight:900;line-height:1;text-align:center;overflow-wrap:anywhere}.prompt.sequence{align-content:center;font-size:clamp(1.7rem,3.6vw,3.2rem);line-height:1.2}.prompt span{color:var(--ink);transition:color .12s ease,text-shadow .12s ease,transform .12s ease}.prompt .done{color:#8fa0b4}.prompt .next{color:var(--warn);text-shadow:0 0 18px rgba(224,168,0,.28)}.roman{min-height:36px;color:var(--accent-strong);font-size:1.65rem;font-weight:900;text-align:center;overflow-wrap:anywhere}.roman .done{color:#95a1b2}.roman .next{color:var(--warn);text-decoration:underline;text-underline-offset:6px}.progress-track{height:10px;overflow:hidden;border-radius:999px;background:#e8edf5}.progress-fill{width:0%;height:100%;border-radius:inherit;background:var(--accent);transition:width .12s ease}.input-area{align-self:center}.input-area label{display:block;margin-bottom:8px;color:var(--muted);font-weight:800}#typingInput{width:100%;height:46px;border:2px solid var(--line);border-radius:8px;padding:0 16px;font-size:1.25rem;font-weight:800;outline:none}#typingInput:focus{border-color:var(--accent);box-shadow:0 0 0 4px #1b8a7a24}.feedback{min-height:24px;margin-top:8px;color:var(--muted);line-height:1.5;font-size:.92rem}.feedback.good{color:var(--accent-strong);font-weight:800}.feedback.bad{color:var(--warn);font-weight:800}.metronome{display:grid;grid-template-columns:1fr 96px 54px 34px;gap:8px;align-items:center;margin-top:10px}.metronome label{display:grid;gap:3px;margin:0;color:var(--muted);font-size:.72rem;font-weight:800}.metronome input[type=number]{width:100%;height:34px;border:1px solid var(--line);border-radius:8px;padding:0 8px;font-weight:900}.metro-sound{justify-items:center}.metro-sound input{width:18px;height:18px}.metro-beat{width:28px;height:28px;border-radius:50%;border:2px solid #b8c2d1;background:#eef2f7;transition:transform 80ms ease,background 80ms ease,border-color 80ms ease}.metro-beat.is-on{border-color:var(--accent)}.metro-beat.pulse{transform:scale(1.22);border-color:var(--warn);background:#fff2bd}.stats-row{display:grid;grid-template-columns:repeat(7,minmax(80px,1fr)) auto;align-items:stretch;gap:10px;padding:10px}.stat{min-height:54px;border:1px solid var(--line);border-radius:8px;padding:7px 8px;background:#fbfcff}.stat span{display:block;color:var(--muted);font-size:.78rem;font-weight:800}.stat strong{display:block;margin-top:1px;font-size:1.22rem}.keyboard-section{min-height:0;padding:14px 20px 12px;overflow:hidden}.results-page{min-height:0;overflow:auto;padding:16px 18px;background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:0 16px 36px #23365214}.results-head{display:flex;justify-content:space-between;gap:16px;align-items:start;margin-bottom:12px}.results-head p{margin-top:2px;color:var(--muted);font-size:.9rem}.results-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:14px}.result-card,.set-row{border:1px solid var(--line);border-radius:8px;background:#fbfcff}.result-card{padding:10px}.result-card h3,.set-results h3,.problem-list h3{margin:0 0 8px;font-size:1rem}.result-card p{color:var(--muted);font-size:.82rem;line-height:1.5}.set-table{display:grid;gap:6px}.set-row{display:grid;grid-template-columns:92px 1.3fr repeat(4,1fr) auto;align-items:center;gap:8px;padding:8px 10px;font-size:.86rem}.set-row strong{display:grid;gap:2px;font-size:.92rem}.set-row small{color:var(--muted);font-size:.72rem;font-weight:700}.practice-set{min-height:30px;border:1px solid var(--accent);border-radius:8px;background:#e8f7f4;color:var(--accent-strong);font-weight:800;cursor:pointer}.problem-list{margin-top:14px}.problem-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.problem-set-card{border:1px solid var(--line);border-radius:8px;background:#fbfcff}.problem-set-card summary{display:grid;gap:2px;padding:9px 10px;cursor:pointer;font-weight:800}.problem-set-card summary span{color:var(--muted);font-size:.76rem;font-weight:700}.problem-set-card ol{display:grid;grid-template-columns:repeat(2,1fr);gap:4px 8px;margin:0;padding:0 10px 10px 30px;font-size:.82rem}.problem-set-card li{padding-right:4px}.problem-set-card li span{font-weight:800}.problem-set-card li small{display:block;color:var(--muted);font-size:.68rem;line-height:1.2}.is-results .practice-panel,.is-results .stats-row,.is-results .keyboard-section{display:none}.section-head{display:flex;justify-content:space-between;gap:18px;align-items:start;margin-bottom:10px}.section-head h2{font-size:1.25rem}.section-head p{margin-top:2px;color:var(--muted);font-size:.88rem}.layout-note{color:var(--muted);font-size:.86rem;font-weight:800;white-space:nowrap}.keyboard{position:relative;display:grid;gap:7px;overflow-x:visible;padding-bottom:4px;justify-content:center}.key-row{display:flex;gap:8px;min-width:0;justify-content:center}.key-row.home{padding-left:48px}.key-row.bottom{padding-left:56px}.key{position:relative;z-index:2;flex:0 0 48px;height:48px;border:1px solid var(--line);border-bottom:4px solid var(--key-shadow);border-radius:8px;background:var(--key);color:var(--ink);display:grid;place-items:center;font-size:1.08rem;font-weight:900;transition:transform 80ms ease,background 80ms ease,border-color 80ms ease}.keyboard-boundaries{position:absolute;top:0;right:0;bottom:0;left:0;z-index:1;pointer-events:none;overflow:visible}.keyboard-boundary{fill:none;stroke:#ff1f1f;stroke-width:3;stroke-linecap:square;stroke-linejoin:miter;vector-effect:non-scaling-stroke}.key.wide{flex-basis:78px}.key.space{flex-basis:286px}.key:after{content:attr(data-finger);position:absolute;bottom:4px;font-size:.5rem;color:var(--muted);font-weight:800}.key.rest:before{content:"";position:absolute;top:6px;width:7px;height:7px;border-radius:50%;background:currentColor}.key.active{transform:translateY(3px);border-bottom-width:1px;background:#fff7e8;border-color:#f2b84b}.key.correct{background:#e8f7f4;border-color:var(--accent)}.key.dormant,.key.kana-muted{visibility:visible;opacity:.28;filter:grayscale(.25)}.key.lesson-key,.key.chord-key,.key.target{opacity:1;filter:none}.key.left-index,.finger.left-index{color:var(--left-index)}.key.left-index{background:color-mix(in srgb,var(--left-index) 16%,white);border-color:color-mix(in srgb,var(--left-index) 45%,var(--line))}.key.left-middle,.finger.left-middle{color:var(--left-middle)}.key.left-middle{background:color-mix(in srgb,var(--left-middle) 16%,white);border-color:color-mix(in srgb,var(--left-middle) 45%,var(--line))}.key.left-ring,.finger.left-ring{color:var(--left-ring)}.key.left-ring{background:color-mix(in srgb,var(--left-ring) 16%,white);border-color:color-mix(in srgb,var(--left-ring) 45%,var(--line))}.key.left-pinky,.finger.left-pinky{color:var(--left-pinky)}.key.left-pinky{background:color-mix(in srgb,var(--left-pinky) 16%,white);border-color:color-mix(in srgb,var(--left-pinky) 45%,var(--line))}.key.right-index,.finger.right-index{color:var(--right-index)}.key.right-index{background:color-mix(in srgb,var(--right-index) 16%,white);border-color:color-mix(in srgb,var(--right-index) 45%,var(--line))}.key.right-middle,.finger.right-middle{color:var(--right-middle)}.key.right-middle{background:color-mix(in srgb,var(--right-middle) 18%,white);border-color:color-mix(in srgb,var(--right-middle) 45%,var(--line))}.key.right-ring,.finger.right-ring{color:var(--right-ring)}.key.right-ring{background:color-mix(in srgb,var(--right-ring) 16%,white);border-color:color-mix(in srgb,var(--right-ring) 45%,var(--line))}.key.right-pinky,.finger.right-pinky{color:var(--right-pinky)}.key.right-pinky{background:color-mix(in srgb,var(--right-pinky) 16%,white);border-color:color-mix(in srgb,var(--right-pinky) 45%,var(--line))}.key.target{z-index:4;outline:5px solid rgba(255,212,74,.55);border-color:#ff6b2b;background:#fff2a8;box-shadow:0 0 0 3px #ff6b2b38,0 0 18px #ffc400a6,0 8px 18px #23365224;transform:translateY(-2px)}.key.chord-key{z-index:3;outline:3px solid rgba(255,212,74,.42);border-color:#f5b936;background:#fff8c8;box-shadow:0 0 14px #ffd23a80}.key.current-key:before{content:"";position:absolute;top:6px;right:6px;bottom:6px;left:6px;border:4px solid #ff3b30;border-radius:999px;z-index:2;pointer-events:none}.key.rest.current-key:before{top:6px;right:6px;bottom:6px;left:6px;width:auto;height:auto;background:transparent}.finger-legend{display:none;flex-wrap:wrap;gap:6px 14px;margin-top:10px;color:var(--muted);font-size:.82rem;font-weight:700}@media(min-height:900px){.finger-legend{display:flex}}.finger-legend span{display:inline-flex;align-items:center;gap:6px}.finger{display:inline-block;width:12px;height:12px;border-radius:50%;background:currentColor}@media(max-width:860px){body{overflow:auto}.app-shell{height:auto;min-height:100svh}.topbar,.section-head{display:block}.lesson-picker{margin-top:12px}#modeSelect{width:100%;min-width:0}.practice-panel{grid-template-columns:1fr}.stats-row{grid-template-columns:repeat(2,1fr)}.secondary-button{grid-column:1 / -1}.layout-note{margin-top:12px}}@media(max-height:820px)and (min-width:861px){.app-shell{width:min(1120px,calc(100vw - 24px));padding:8px 0;gap:8px}.topbar{padding:10px 16px}.eyebrow{display:none}h1{font-size:1.45rem}.practice-panel{padding:12px 16px}.prompt{min-height:70px;font-size:4.3rem}.roman{min-height:30px;font-size:1.35rem}.stats-row{padding:8px}.stat{min-height:48px}.keyboard-section{padding:10px 16px}.section-head{margin-bottom:8px}.section-head p,.finger-legend{display:none}.key-row{min-width:0}.key.wide{flex-basis:78px}.key.space{flex-basis:280px}}.drive-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:9999;background:#1d25307a;backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);display:flex;align-items:center;justify-content:center;padding:24px}.overlay-content{background:var(--panel);border:1px solid var(--line);box-shadow:0 24px 56px #23365229;border-radius:12px;padding:36px 32px;max-width:440px;width:100%;text-align:center}.overlay-content h2{font-size:1.45rem;font-weight:800;margin:0 0 12px;color:var(--ink);line-height:1.3}.overlay-content p{color:var(--muted);font-size:.92rem;line-height:1.6;margin:0 0 24px}.primary-button{width:100%;min-height:46px;background:var(--accent);color:#fff;border:none;border-radius:8px;font-weight:800;font-size:.98rem;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:10px;transition:background .15s ease,transform .1s ease;box-shadow:0 4px 12px #1b8a7a3d}.primary-button:hover{background:var(--accent-strong)}.primary-button:active{transform:scale(.98)}.google-icon{flex-shrink:0;background:#fff;border-radius:50%;padding:2px}