@font-face{font-family:Manrope;font-style:normal;font-weight:200 800;font-display:swap;src:local("Manrope")}:root{--font-sans: "Manrope", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--background: oklch(.97 .005 240);--surface: oklch(.995 .003 240);--surface-secondary: oklch(.96 .004 240);--foreground: oklch(.2 .015 260);--muted: oklch(.5 .02 250);--border: oklch(.88 .008 240);--separator: oklch(.9 .006 240);--accent: oklch(.6 .1 245);--accent-soft: oklch(.92 .03 245);--accent-soft-foreground: oklch(.3 .03 245);--accent-foreground: white;--success: oklch(.55 .1 155);--success-soft: oklch(.92 .06 155);--danger: oklch(.6 .12 25);--danger-soft: oklch(.94 .04 25);--warning: oklch(.7 .1 85);--key-bed: oklch(.26 .02 262);--key-felt: oklch(.36 .045 262);--key-white-face: oklch(.98 .003 250);--key-white-shade: oklch(.9 .007 250);--key-black-top: oklch(.34 .02 262);--key-black-face: oklch(.26 .022 262);--key-black-lip: oklch(.19 .02 262);--key-highlight-wash: oklch(.88 .06 245);--key-highlight-edge: oklch(.6 .1 245);--staff-paper: oklch(.995 .002 250);--staff-ink: oklch(.22 .015 260);--staff-ink-muted: oklch(.55 .02 255);--key-case: oklch(.21 .018 262);--key-cheek: oklch(.28 .02 262);--cheek: clamp(10px, 4vw, 64px);--key-area: min(460px, calc(100vw - 2 * var(--cheek)), 66.668vh );--key-bed-height: calc(var(--key-area) * .6);color:var(--foreground);background:var(--background);font-family:var(--font-sans);font-synthesis:none;text-rendering:optimizeLegibility}:root[data-theme=dark],.dark{--background: oklch(.12 .015 255);--surface: oklch(.16 .012 255);--surface-secondary: oklch(.2 .01 255);--foreground: oklch(.95 .005 260);--muted: oklch(.75 .015 255);--border: oklch(.28 .015 255);--separator: oklch(.25 .015 255);--accent: oklch(.48 .08 245);--accent-soft: oklch(.28 .04 245);--accent-soft-foreground: oklch(.85 .02 245);--success: oklch(.72 .12 155);--success-soft: oklch(.25 .06 155);--danger: oklch(.65 .12 25);--danger-soft: oklch(.29 .05 25);--key-bed: oklch(.1 .015 258);--key-felt: oklch(.32 .04 262);--key-white-face: oklch(.86 .006 250);--key-white-shade: oklch(.74 .009 250);--key-black-top: oklch(.3 .018 258);--key-black-face: oklch(.22 .018 258);--key-black-lip: oklch(.14 .015 258);--key-highlight-wash: oklch(.72 .075 245);--key-highlight-edge: oklch(.5 .1 245);--key-case: oklch(.08 .012 258);--key-cheek: oklch(.15 .015 258)}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--background: oklch(.12 .015 255);--surface: oklch(.16 .012 255);--surface-secondary: oklch(.2 .01 255);--foreground: oklch(.95 .005 260);--muted: oklch(.75 .015 255);--border: oklch(.28 .015 255);--separator: oklch(.25 .015 255);--accent: oklch(.48 .08 245);--accent-soft: oklch(.28 .04 245);--accent-soft-foreground: oklch(.85 .02 245);--success: oklch(.72 .12 155);--success-soft: oklch(.25 .06 155);--danger: oklch(.65 .12 25);--danger-soft: oklch(.29 .05 25);--key-bed: oklch(.1 .015 258);--key-felt: oklch(.32 .04 262);--key-white-face: oklch(.86 .006 250);--key-white-shade: oklch(.74 .009 250);--key-black-top: oklch(.3 .018 258);--key-black-face: oklch(.22 .018 258);--key-black-lip: oklch(.14 .015 258);--key-highlight-wash: oklch(.72 .075 245);--key-highlight-edge: oklch(.5 .1 245);--key-case: oklch(.08 .012 258);--key-cheek: oklch(.15 .015 258)}}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0;background:var(--background)}body{min-width:320px}button,a{font:inherit}button{color:inherit}button:focus-visible,a:focus-visible{outline:3px solid color-mix(in oklch,var(--accent) 70%,white);outline-offset:3px}button:disabled{cursor:default}.app-loading{min-height:100vh;display:grid;place-items:center;color:var(--accent)}.app-shell{min-height:100vh;padding-bottom:1rem}.app-shell.is-session{padding-bottom:0}.top-bar{height:70px;display:flex;align-items:center;gap:1.6rem;padding:0 clamp(1rem,4vw,4rem);border-bottom:1px solid var(--separator);background:color-mix(in oklch,var(--background) 88%,transparent)}.brand{display:inline-flex;align-items:center;gap:.58rem;color:var(--foreground);font-size:1.05rem;font-weight:800;letter-spacing:-.04em}.brand-button{border:0;background:transparent;cursor:pointer;padding:.4rem 0}.brand-mark{width:30px;height:30px;display:inline-grid;place-items:center;color:#fff;background:var(--accent);border-radius:9px;box-shadow:0 4px 10px color-mix(in oklch,var(--accent) 28%,transparent)}.top-spacer{flex:1}.icon-link{display:inline-grid;place-items:center;width:34px;height:34px;color:var(--foreground);border-radius:50%;transition:opacity .15s ease,background .15s ease}.icon-link:hover{background:color-mix(in oklch,var(--foreground) 8%,transparent)}.desktop-nav{display:flex;align-self:stretch;align-items:stretch;gap:.1rem}.nav-button{border:0;border-bottom:2px solid transparent;background:transparent;color:var(--muted);display:inline-flex;align-items:center;gap:.45rem;padding:.25rem .8rem;cursor:pointer;font-size:.82rem;font-weight:700;transition:color .2s ease,border-color .2s ease}.nav-button:hover,.nav-button.active{color:var(--foreground)}.nav-button.active{border-bottom-color:var(--accent)}.main-content{width:min(1180px,calc(100% - 2rem));margin:0 auto}.page{padding:clamp(2.2rem,5vw,4.5rem) 0 3rem}.page-heading{display:flex;justify-content:space-between;align-items:end;gap:1.5rem;margin-bottom:2.1rem}.eyebrow{margin:0 0 .65rem;color:var(--accent-soft-foreground);font-size:.7rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}h1,h2,p{margin-top:0}h1{margin-bottom:.55rem;font-size:clamp(2rem,4vw,3.25rem);line-height:1.08;letter-spacing:-.065em}h2{letter-spacing:-.04em}.subheading,.lead{max-width:620px;margin-bottom:0;color:var(--muted);font-size:1rem;line-height:1.7}.fine-print,.muted-copy,.setting-hint,.about-copy{color:var(--muted);font-size:.8rem;line-height:1.6}.surface{border:1px solid var(--separator);border-radius:17px;background:var(--surface);box-shadow:0 2px 8px color-mix(in oklch,var(--foreground) 4%,transparent)}.button{display:inline-flex;justify-content:center;align-items:center;gap:.55rem;min-height:42px;border:1px solid transparent;border-radius:10px;padding:.65rem 1rem;cursor:pointer;font-weight:800;font-size:.84rem;transition:transform .15s ease,background .15s ease,border-color .15s ease}.button:hover{transform:translateY(-1px)}.button-primary{color:var(--accent-foreground);background:var(--accent);box-shadow:0 5px 12px color-mix(in oklch,var(--accent) 20%,transparent)}.button-primary:hover{background:color-mix(in oklch,var(--accent) 90%,black)}.button-secondary{border-color:var(--border);background:var(--surface-secondary)}.button-large{min-height:52px;padding-inline:1.25rem}.quiet-button,.back-link{display:inline-flex;align-items:center;gap:.4rem;border:0;background:transparent;color:var(--muted);cursor:pointer;font-size:.76rem;font-weight:750}.quiet-button:hover,.back-link:hover{color:var(--foreground)}.session-note{display:inline-flex;align-items:center;gap:.45rem;color:var(--muted);font-size:.76rem}.session-note svg,.local-note svg{color:var(--success)}.onboarding-page{min-height:100vh;display:grid;place-items:center;padding:1.25rem;background:radial-gradient(circle at 50% 0,color-mix(in oklch,var(--accent-soft) 45%,transparent),transparent 42rem),var(--background)}.onboarding-card{width:min(530px,100%);padding:clamp(1.5rem,6vw,3.25rem);border:1px solid var(--separator);border-radius:24px;background:var(--surface);box-shadow:0 18px 55px color-mix(in oklch,var(--foreground) 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7%,transparent)}.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}.mode-grid button{min-height:76px;padding:.75rem;border:1px solid var(--border);border-radius:11px;background:transparent;cursor:pointer;text-align:left}.mode-grid button:hover,.mode-grid button.selected{border-color:var(--accent);background:var(--accent-soft)}.mode-grid strong,.mode-grid small{display:block}.mode-grid strong{font-size:.84rem}.mode-grid small{margin-top:.4rem;color:var(--muted);font-size:.7rem;line-height:1.45}.start-button{width:100%;margin-top:.1rem}.principle-panel{position:relative;display:flex;flex-direction:column;justify-content:center;overflow:hidden}.principle-line{width:80px;height:1px;margin-bottom:2.2rem;background:var(--accent)}.principle-panel h2{max-width:290px;margin-bottom:.85rem;font-size:clamp(1.7rem,3vw,2.5rem)}.principle-panel>p:not(.eyebrow){max-width:340px;color:var(--muted);font-size:.85rem;line-height:1.65}.principle-stats{display:flex;gap:2rem;margin-top:2rem;padding-top:1.2rem;border-top:1px solid var(--separator)}.principle-stats strong,.principle-stats small{display:block}.principle-stats strong{font-family:ui-monospace,monospace;font-size:1.15rem}.principle-stats small{margin-top:.25rem;color:var(--muted);font-size:.68rem}.local-note{display:flex;justify-content:center;align-items:center;gap:.4rem;margin:1.5rem 0;color:var(--muted);font-size:.75rem}.practice-page{width:min(100%,1060px);margin:0 auto;padding:1rem 0 2rem}.practice-toolbar{display:flex;align-items:center;gap:1rem;min-height:44px;color:var(--muted)}.practice-counter,.practice-mode-label{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.7rem}.practice-mode-label{padding-left:.9rem;border-left:1px solid var(--separator)}.toolbar-actions{display:flex;gap:1rem;margin-left:auto}.finish-button{color:var(--danger)}.practice-stage{position:relative;display:flex;flex-direction:column;align-items:center;padding-top:1.1rem}.timing-line{width:100%;height:2px;margin-bottom:1rem;border-radius:2px;background:transparent;transform-origin:left}.timing-line.timed{background:var(--accent);transition:transform .1s linear}.timing-line.feedback-correct{background:var(--success);transform:scaleX(1)!important}.timing-line.feedback-incorrect,.timing-line.feedback-timeout{background:var(--danger);transform:scaleX(1)!important}.staff-stage{width:min(100%,900px);min-height:246px;display:grid;place-items:center;overflow:hidden;border:1px solid color-mix(in oklch,var(--staff-ink) 12%,var(--staff-paper));border-radius:6px;color:var(--staff-ink);background:var(--staff-paper)}.staff-stage>*{transition:opacity .18s ease}.staff-stage.is-correct>*{opacity:.7}.staff-stage.is-incorrect>*,.staff-stage.is-timeout>*{opacity:.35}.staff-stage.is-paused{min-height:246px}.staff-wrap{width:100%;height:220px}.staff-renderer{width:100%;height:220px;color:inherit}.staff-renderer svg{display:block;width:100%;height:100%}.staff-cleared{display:grid;place-items:center;width:100%;height:220px;color:var(--staff-ink-muted);font-size:2rem}.paused-copy{display:flex;flex-direction:column;align-items:center;gap:.7rem;color:var(--staff-ink-muted)}.answer-status{display:grid;place-items:center;width:100%;min-height:50px;margin:.35rem 0 1rem}.answer-prompt{margin:0;color:var(--muted);font-size:.74rem;text-align:center}.answer-prompt.intro-prompt{color:var(--accent-soft-foreground);font-weight:750}.answer-area{width:100%}.answer-area-keyboard{position:fixed;right:0;bottom:env(safe-area-inset-bottom,0px);left:0;z-index:6}.is-session .practice-page{display:flex;flex-direction:column;min-height:100dvh;padding-top:max(.75rem,env(safe-area-inset-top,0px));padding-bottom:1.5rem}.is-session .practice-page:has(.answer-area-keyboard){padding-bottom:calc(var(--key-bed-height) + 1.5rem)}.is-session .practice-stage{flex:1;justify-content:center}.piano-shell{position:relative;display:grid;grid-template-columns:1fr var(--key-area) 1fr;width:100%;background:var(--key-case);box-shadow:0 -10px 24px -18px color-mix(in oklch,var(--foreground) 70%,transparent)}.piano-shell:before{content:"";position:absolute;z-index:4;top:0;right:0;left:0;height:5px;background:linear-gradient(to bottom,color-mix(in oklch,var(--key-felt) 70%,black),var(--key-felt));pointer-events:none}.piano-case{background:linear-gradient(to bottom,color-mix(in oklch,black 32%,transparent),transparent 24%),linear-gradient(to var(--case-direction),color-mix(in oklch,white 14%,var(--key-cheek)) 0 1px,var(--key-cheek) 1px var(--cheek),var(--key-case) var(--cheek))}.piano-case-left{--case-direction: left}.piano-case-right{--case-direction: right}.piano{position:relative;width:100%;aspect-ratio:7 / 4.2;overflow:hidden;background:var(--key-bed);box-shadow:inset 4px 0 6px -5px color-mix(in oklch,black 70%,transparent),inset -4px 0 6px -5px color-mix(in oklch,black 70%,transparent)}.white-keys{position:absolute;inset:0;display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:1px;padding-bottom:1px}.black-keys{position:absolute;inset:0;pointer-events:none}.piano-key{border:0;cursor:pointer;transition:background .13s ease,transform .08s ease,box-shadow .13s ease}.piano-key:focus-visible{z-index:5;outline:2px solid var(--accent);outline-offset:-3px}.piano-key-white{min-width:0;background:linear-gradient(to bottom,var(--key-white-shade),var(--key-white-face) 22%,var(--key-white-face) 88%,color-mix(in oklch,var(--key-white-shade) 55%,var(--key-white-face)));box-shadow:inset -1px 0 color-mix(in oklch,var(--foreground) 7%,transparent)}.piano-key-white:last-child{box-shadow:none}.piano-key-white:hover{background:linear-gradient(to top,color-mix(in oklch,var(--key-highlight-wash) 32%,var(--key-white-face)),var(--key-white-face) 48%)}.piano-key-white:active{transform:translateY(2px);box-shadow:inset 0 -3px 6px -4px color-mix(in oklch,var(--foreground) 45%,transparent)}.piano-key-white.is-highlighted{background:linear-gradient(to top,var(--key-highlight-wash),color-mix(in oklch,var(--key-highlight-wash) 40%,var(--key-white-face)) 45%,var(--key-white-face) 78%);box-shadow:inset 0 -4px 0 var(--key-highlight-edge),inset 0 -16px 20px -14px color-mix(in oklch,var(--key-highlight-edge) 70%,transparent)}.piano-key-black{position:absolute;top:0;z-index:2;height:62%;transform:translate(-50%);background:linear-gradient(to bottom,var(--key-black-top),var(--key-black-face) 58%,var(--key-black-lip));box-shadow:0 3px 4px -2px color-mix(in oklch,var(--foreground) 55%,transparent),inset 0 -1.5px color-mix(in oklch,white 26%,transparent);pointer-events:auto}.piano-key-black:hover{background:linear-gradient(to bottom,var(--key-black-top),color-mix(in oklch,var(--accent) 30%,var(--key-black-face)) 70%,var(--key-black-lip))}.piano-key-black:active{transform:translate(-50%,2px)}.piano-key-black.is-highlighted{background:linear-gradient(to bottom,var(--key-black-top),color-mix(in oklch,var(--accent) 55%,var(--key-black-face)) 68%,color-mix(in oklch,var(--accent) 72%,var(--key-black-lip)));box-shadow:0 3px 4px -2px color-mix(in oklch,var(--foreground) 55%,transparent),inset 0 -1.5px color-mix(in oklch,white 55%,var(--accent))}.piano-key-black:disabled,.piano-key-white:disabled{opacity:1}.name-pad{display:grid;grid-template-columns:repeat(14,1fr);grid-template-rows:auto auto;gap:.4rem;width:min(620px,100%);margin:0 auto}.name-choice{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:68px;border:1px solid var(--border);border-radius:12px;background:var(--surface);cursor:pointer;font-size:clamp(.8rem,2vw,1rem);font-weight:800}.name-choice-accidental{min-height:56px;border-color:color-mix(in oklch,var(--foreground) 45%,var(--border));background:color-mix(in oklch,var(--foreground) 8%,var(--surface));font-size:clamp(.7rem,1.8vw,.85rem)}.note-label{white-space:nowrap}.accidental{margin-left:.08em;vertical-align:-.14em}.note-octave{margin-left:.1em;color:var(--muted);font-size:.72em;font-weight:650;letter-spacing:0}.name-choice-accidental small{color:var(--muted);font-size:.85em;font-weight:650}.name-choice:hover,.name-choice:active{border-color:var(--accent);background:var(--accent-soft)}.speed-caption.is-hidden{visibility:hidden}.speed-caption{display:inline-flex;align-items:center;gap:.35rem;margin-top:1rem;color:var(--muted);font-family:ui-monospace,monospace;font-size:.68rem}.feedback-banner{display:inline-flex;align-items:center;gap:.65rem;min-height:48px;padding:.5rem 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