*,*:before,*:after{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}:root{--bg: #1a1a1a;--bg-card: #2a2a2a;--bg-panel: #e5e5e5;--bg-sheet: #333333;--accent: #007AFF;--correct: #4CAF50;--wrong: #F44336;--text: #ffffff;--text-dim: #999999;--text-panel: #1a1a1a;--text-sheet: #007AFF;--separator: #3a3a3a;--key-white: #f5f5f5;--key-black: #1a1a1a;--key-correct: #4CAF50;--key-wrong: #F44336;--radius: 12px;--radius-sm: 8px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;--font-mono: "SF Mono", "Menlo", "Monaco", "Courier New", monospace;--transition: .2s ease}html,body{height:100%;overflow:hidden}body{background:var(--bg);color:var(--text);font-family:var(--font);max-width:480px;margin:0 auto;position:relative;height:100dvh;overflow:hidden;user-select:none;-webkit-user-select:none}button{font-family:var(--font);cursor:pointer;border:none;outline:none;background:none}button:active{opacity:.75}.screen{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;background:var(--bg);opacity:0;pointer-events:none;transform:translate(20px);transition:opacity var(--transition),transform var(--transition);overflow:hidden}.screen.active{opacity:1;pointer-events:all;transform:translate(0)}#homeScreen{justify-content:center;align-items:center;gap:32px;padding:40px 24px}.home-header h1{font-size:28px;font-weight:700;letter-spacing:-.03em;text-align:center;color:var(--text)}.home-stats{display:flex;gap:0;background:var(--bg-card);border-radius:var(--radius);width:100%;overflow:hidden}.stat-item{flex:1;display:flex;flex-direction:column;align-items:center;padding:20px 12px;position:relative}.stat-item+.stat-item:before{content:"";position:absolute;left:0;top:16px;bottom:16px;width:1px;background:var(--separator)}.stat-value{font-size:28px;font-weight:700;letter-spacing:-.02em;color:var(--text);font-family:var(--font-mono)}.stat-label{font-size:12px;color:var(--text-dim);margin-top:4px;text-transform:uppercase;letter-spacing:.05em;font-weight:500}#homeScreen .btn-primary,#homeScreen .btn-secondary{width:100%}.top-bar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:var(--bg);min-height:48px;flex-shrink:0}.top-bar span{font-size:15px;font-weight:600;color:var(--text);letter-spacing:-.01em}#scoreDisplay{font-family:var(--font-mono);font-size:15px;font-weight:700;color:var(--text)}#accuracyDisplay{font-family:var(--font-mono);font-size:15px;font-weight:600;color:var(--text)}#timerDisplay{font-family:var(--font-mono);font-size:14px;color:var(--text-dim)}.icon-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:transparent;color:var(--text);font-size:28px;font-weight:300;transition:background var(--transition);flex-shrink:0}.icon-btn:active{background:#ffffff1a;opacity:1}.icon-btn.menu-dots{font-size:18px;letter-spacing:2px;font-weight:700}.note-panels{display:flex;flex-direction:column;gap:8px;margin:0 10px;flex-shrink:0}.note-panel{background:var(--bg-panel);display:flex;flex-direction:column;justify-content:center;padding:0;height:25vh;border-radius:14px;overflow:hidden;box-shadow:0 1px 4px #0000004d}.note-panel.question-panel{background:linear-gradient(to bottom,#f0f0f0,#e2e2e2)}.note-panel.reference-panel{background:linear-gradient(to bottom,#dcdcdc,#c8c8c8)}.panel-label{font-size:15px;font-weight:500;color:#444;padding:0 16px 6px;text-align:center;letter-spacing:.01em}.panel-content{display:flex;align-items:center;padding:0 16px;gap:12px;position:relative}.play-btn{width:32px;height:32px;border-radius:0;background:transparent;color:#444;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:transform var(--transition);box-shadow:none}.play-btn:active{transform:scale(.9);opacity:.6}.play-btn.playing{background:transparent;color:#000}.playback-line{flex:1;height:2px;background:#b0b0b0;border-radius:1px;position:relative;overflow:hidden}.playback-line:after{content:"";position:absolute;left:-100%;top:0;width:100%;height:100%;background:#666;border-radius:1px;transition:none}.playback-line.active:after{animation:playbackSweep 1.2s linear forwards}@keyframes playbackSweep{0%{left:-100%}to{left:100%}}.note-name{font-size:20px;font-weight:600;color:var(--text-panel);font-family:var(--font-mono);min-width:24px;text-align:right;letter-spacing:-.02em}#pianoContainer{flex:1;display:flex;align-items:stretch;padding:0;overflow:hidden;position:relative;background:var(--bg);min-height:0;margin:8px 10px;border-radius:14px}.piano-scroll-wrapper{width:100%;height:100%;position:relative;touch-action:pan-x;overflow:hidden}.piano-nav{position:absolute;top:50%;transform:translateY(-50%);z-index:10;width:44px;height:44px;border-radius:50%;background:#000000a6;color:#fff;font-size:24px;font-weight:400;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border:1.5px solid rgba(255,255,255,.25);box-shadow:0 2px 8px #0006}.piano-nav:active{background:#000000d9;opacity:1}.piano-nav.nav-left{left:8px}.piano-nav.nav-right{right:8px}.piano-nav.nav-hidden{opacity:0;pointer-events:none}.piano-keyboard{position:relative;width:100%;height:100%;background:#111;border-radius:14px;overflow:hidden}.piano-key.white{position:absolute;top:0;bottom:0;background:linear-gradient(to bottom,#fafafa,#f0f0f0 85%,#e0e0e0);border-right:1px solid #bbb;border-left:1px solid #bbb;margin-left:-.5px;border-radius:0 0 6px 6px;cursor:pointer;touch-action:manipulation;transition:background .12s ease;display:flex;align-items:flex-end;justify-content:center;padding-bottom:10px;box-shadow:inset 0 -4px 8px #00000014,0 2px 4px #0000004d;z-index:1}.piano-key.white:active,.piano-key.white.pressed{background:linear-gradient(to bottom,#eee,#ddd 85%,#d0d0d0)}.piano-key.white.correct{background:var(--key-correct)!important}.piano-key.white.wrong{background:var(--key-wrong)!important}.piano-key .key-label{font-size:10px;font-weight:600;color:#888;pointer-events:none;font-family:var(--font-mono);letter-spacing:-.02em}.piano-key.black{position:absolute;top:0;height:58%;background:linear-gradient(to bottom,#333,#1a1a1a 70%,#111);border-radius:0 0 4px 4px;z-index:2;cursor:pointer;touch-action:manipulation;box-shadow:2px 4px 8px #000c,inset 0 -2px 4px #ffffff14;display:flex;align-items:flex-end;justify-content:center;padding-bottom:6px;transition:background .12s ease}.piano-key.black:active,.piano-key.black.pressed{background:linear-gradient(to bottom,#444,#2a2a2a 70%,#222)}.piano-key.black.correct{background:#2e7d32!important}.piano-key.black.wrong{background:#b71c1c!important}.piano-key.black .key-label{font-size:9px;font-weight:600;color:#666;pointer-events:none;font-family:var(--font-mono)}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:flex;flex-direction:column;justify-content:flex-end;max-width:480px;margin:0 auto}.overlay.hidden{display:none}.overlay-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:#0000008c;backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px)}.bottom-sheet{position:relative;background:var(--bg-sheet);border-radius:16px 16px 0 0;padding:8px 0 env(safe-area-inset-bottom,16px);z-index:1;transform:translateY(100%);animation:slideUp .25s cubic-bezier(.34,1.1,.64,1) forwards}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.sheet-handle{width:36px;height:4px;background:#fff3;border-radius:2px;margin:0 auto 12px}.sheet-title{font-size:13px;font-weight:600;color:var(--text-dim);text-align:center;padding:4px 16px 12px;text-transform:uppercase;letter-spacing:.06em}.sheet-item{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-top:1px solid rgba(255,255,255,.08);cursor:pointer;transition:background var(--transition)}.sheet-item:first-of-type{border-top:none}.sheet-item:active{background:#ffffff0f}.sheet-item-label{font-size:17px;color:var(--text-sheet);font-weight:400}.sheet-item-value{font-size:15px;color:var(--text-dim);font-family:var(--font-mono)}.sheet-item.destructive .sheet-item-label{color:var(--wrong)}.sheet-cancel{display:block;width:calc(100% - 32px);margin:8px 16px 0;padding:16px;background:var(--bg-sheet);border-radius:var(--radius);text-align:center;font-size:17px;font-weight:600;color:var(--accent);cursor:pointer;transition:background var(--transition)}.sheet-cancel:active{background:#444;opacity:1}#customizeModal{justify-content:flex-start;background:var(--bg)}#customizeModal .modal{position:relative;display:flex;flex-direction:column;width:100%;height:100%;background:var(--bg);z-index:1;overflow-y:auto;-webkit-overflow-scrolling:touch}.modal-top-bar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:var(--bg-card);border-bottom:1px solid var(--separator);flex-shrink:0}.modal-top-bar span{font-size:17px;font-weight:600;color:var(--text)}.modal-top-bar button{font-size:17px;color:var(--accent);padding:4px 8px}.modal-section{padding:24px 16px 0}.modal-section-title{font-size:13px;font-weight:600;color:var(--text-dim);text-transform:uppercase;letter-spacing:.06em;padding:0 4px 8px}.modal-group{background:var(--bg-card);border-radius:var(--radius);overflow:hidden}.modal-row{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-top:1px solid var(--separator);min-height:50px}.modal-row:first-child{border-top:none}.modal-row-label{font-size:16px;color:var(--text);font-weight:400}.modal-row-value{font-size:15px;color:var(--text-dim);font-family:var(--font-mono)}.toggle-switch{position:relative;width:51px;height:31px;flex-shrink:0}.toggle-switch input{opacity:0;width:0;height:0;position:absolute}.toggle-track{position:absolute;top:0;right:0;bottom:0;left:0;background:#39393d;border-radius:15.5px;cursor:pointer;transition:background .25s ease}.toggle-track:after{content:"";position:absolute;top:2px;left:2px;width:27px;height:27px;background:#fff;border-radius:50%;transition:transform .25s cubic-bezier(.4,0,.2,1);box-shadow:0 2px 4px #0006}.toggle-switch input:checked+.toggle-track{background:var(--accent)}.toggle-switch input:checked+.toggle-track:after{transform:translate(20px)}.segmented-control{display:flex;background:#3a3a3c;border-radius:8px;padding:2px;gap:2px}.segmented-control button{flex:1;padding:6px 12px;border-radius:6px;font-size:13px;font-weight:500;color:var(--text-dim);transition:background var(--transition),color var(--transition)}.segmented-control button.active{background:var(--bg-card);color:var(--text)}.stepper{display:flex;align-items:center;gap:12px}.stepper-value{font-size:17px;font-weight:600;color:var(--text);font-family:var(--font-mono);min-width:32px;text-align:center}.stepper-btn{width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;font-size:20px;font-weight:300;display:flex;align-items:center;justify-content:center;line-height:1}.stepper-btn:disabled{background:#3a3a3c;color:var(--text-dim)}#summaryScreen{justify-content:center;align-items:center;gap:28px;padding:40px 24px}.summary-header h2{font-size:28px;font-weight:700;letter-spacing:-.03em;color:var(--text);text-align:center}.summary-stats{width:100%;background:var(--bg-card);border-radius:var(--radius);overflow:hidden}.summary-stat-row{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-top:1px solid var(--separator)}.summary-stat-row:first-child{border-top:none}.summary-stat-label{font-size:16px;color:var(--text);font-weight:400}.summary-stat-value{font-size:17px;font-weight:700;color:var(--accent);font-family:var(--font-mono)}.summary-stat-value.correct{color:var(--correct)}.summary-stat-value.wrong{color:var(--wrong)}.summary-actions{display:flex;flex-direction:column;gap:12px;width:100%}#progressScreen{overflow:hidden}.progress-content{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:16px;display:flex;flex-direction:column;gap:16px}#thresholdChart{width:100%;height:auto;background:var(--bg-card);border-radius:var(--radius);display:block}.overall-stats{background:var(--bg-card);border-radius:var(--radius);overflow:hidden}.overall-stat-row{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-top:1px solid var(--separator)}.overall-stat-row:first-child{border-top:none}.overall-stat-label{font-size:15px;color:var(--text)}.overall-stat-value{font-size:15px;font-weight:600;color:var(--accent);font-family:var(--font-mono)}#sessionTable{background:var(--bg-card);border-radius:var(--radius);overflow:hidden}.session-table-header{display:grid;grid-template-columns:1fr 2fr 1fr 1fr;padding:10px 16px;border-bottom:1px solid var(--separator)}.session-table-header span{font-size:11px;font-weight:600;color:var(--text-dim);text-transform:uppercase;letter-spacing:.05em}.session-table-row{display:grid;grid-template-columns:1fr 2fr 1fr 1fr;padding:12px 16px;border-top:1px solid var(--separator);align-items:center}.session-table-row span{font-size:13px;color:var(--text);font-family:var(--font-mono)}.export-actions{display:flex;gap:12px}.export-actions .btn-secondary{flex:1}.btn-primary{display:block;width:100%;padding:16px 24px;background:var(--accent);color:#fff;font-size:17px;font-weight:600;border-radius:var(--radius);text-align:center;letter-spacing:-.01em;transition:background var(--transition),transform 80ms ease;box-shadow:0 2px 12px #007aff59}.btn-primary:active{background:#0056cc;transform:scale(.98);opacity:1}.btn-secondary{display:block;width:100%;padding:15px 24px;background:transparent;color:var(--accent);font-size:17px;font-weight:600;border-radius:var(--radius);text-align:center;letter-spacing:-.01em;border:1.5px solid var(--accent);transition:background var(--transition),transform 80ms ease}.btn-secondary:active{background:#007aff1a;transform:scale(.98);opacity:1}#freePlayOverlay{z-index:200;background:#000}.free-play-screen{width:100%;height:100%;display:flex;flex-direction:column;background:#111;position:relative}.free-play-close{position:absolute;top:12px;right:16px;z-index:10;width:36px;height:36px;border-radius:50%;background:#ffffff26;color:#fff;font-size:24px;font-weight:300;display:flex;align-items:center;justify-content:center;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.free-play-close:active{background:#ffffff4d;opacity:1}.free-play-piano{flex:1;display:flex;align-items:stretch;overflow:hidden;position:relative;min-height:0}.free-play-piano .piano-scroll-wrapper{overflow:hidden}.free-play-piano .piano-keyboard{border-radius:0}@media(orientation:portrait){.free-play-screen{transform:rotate(90deg);transform-origin:top left;width:100vh;height:100vw;position:absolute;top:0;left:100%}.free-play-close{top:16px;right:20px}}@media(orientation:landscape){.free-play-screen{transform:none;width:100%;height:100%}}.free-play-piano .piano-key .key-label{font-size:11px;opacity:.6}.hidden{display:none!important}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .2s ease forwards}@keyframes pulse{0%,to{box-shadow:0 0 #007aff66}50%{box-shadow:0 0 0 8px #007aff00}}.play-btn.playing{animation:pulse 1s ease infinite}@supports (padding-bottom: env(safe-area-inset-bottom)){#homeScreen,#summaryScreen{padding-bottom:max(40px,env(safe-area-inset-bottom))}#trainingScreen .top-bar,#progressScreen .top-bar{padding-top:max(12px,env(safe-area-inset-top))}}@media(max-height:700px){.note-panels{padding:10px 12px 8px}.panel-content{padding:6px 12px 10px}.play-btn{width:38px;height:38px}.note-name{font-size:18px}.home-stats{gap:0}.stat-value{font-size:24px}}