@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(99.5% .003 240);--surface-secondary:oklch(96% .004 240);--foreground:oklch(20% .015 260);--muted:oklch(50% .02 250);--border:oklch(88% .008 240);--separator:oklch(90% .006 240);--accent:oklch(60% .1 245);--accent-soft:oklch(92% .03 245);--accent-soft-foreground:oklch(30% .03 245);--accent-foreground:white;--success:oklch(55% .1 155);--success-soft:oklch(92% .06 155);--danger:oklch(60% .12 25);--danger-soft:oklch(94% .04 25);--warning:oklch(70% .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(90% .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 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250);--key-white-shade:oklch(74% .009 250);--key-black-top:oklch(30% .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(50% .1 245);--key-case:oklch(8% .012 258);--key-cheek:oklch(15% .015 258)}}*{box-sizing:border-box}html,body,#root{background:var(--background);min-height:100%;margin:0}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;color:var(--accent);place-items:center;display:grid}.app-shell{min-height:100vh;padding-bottom:1rem}.app-shell.is-session{padding-bottom:0}.top-bar{border-bottom:1px solid var(--separator);background:color-mix(in oklch, var(--background) 88%, transparent);align-items:center;gap:1.6rem;height:70px;padding:0 clamp(1rem,4vw,4rem);display:flex}.brand{color:var(--foreground);letter-spacing:-.04em;align-items:center;gap:.58rem;font-size:1.05rem;font-weight:800;display:inline-flex}.brand-button{cursor:pointer;background:0 0;border:0;padding:.4rem 0}.brand-mark{width:30px;height:30px;color:var(--foreground);display:inline-block}.brand-mark svg{width:100%;height:100%;display:block}.top-spacer{flex:1}.icon-link{width:34px;height:34px;color:var(--foreground);border-radius:50%;place-items:center;transition:opacity .15s,background .15s;display:inline-grid}.icon-link:hover{background:color-mix(in oklch, var(--foreground) 8%, transparent)}.desktop-nav{align-self:stretch;align-items:stretch;gap:.1rem;display:flex}.nav-button{color:var(--muted);cursor:pointer;background:0 0;border:0;border-bottom:2px solid #0000;align-items:center;gap:.45rem;padding:.25rem .8rem;font-size:.82rem;font-weight:700;transition:color .2s,border-color 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.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{grid-template-columns:1fr var(--key-area) 1fr;background:var(--key-case);width:100%;box-shadow:0 -10px 24px -18px color-mix(in oklch, var(--foreground) 70%, transparent);display:grid;position:relative}.piano-shell:before{content:"";z-index:4;background:linear-gradient(to bottom, color-mix(in oklch, var(--key-felt) 70%, black), var(--key-felt));pointer-events:none;height:5px;position:absolute;top:0;left:0;right:0}.piano-case{background:linear-gradient(to bottom, oklch(0% none none/.32), 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{aspect-ratio:7/4.2;background:var(--key-bed);width:100%;position:relative;overflow:hidden;box-shadow:inset 4px 0 6px -5px oklch(0% none none/.7),inset -4px 0 6px -5px oklch(0% none none/.7)}.white-keys{grid-template-columns:repeat(7,minmax(0,1fr));gap:1px;padding-bottom:1px;display:grid;position:absolute;inset:0}.black-keys{pointer-events:none;position:absolute;inset:0}.piano-key{cursor:pointer;border:0;transition:background .13s,transform 80ms,box-shadow .13s}.piano-key:focus-visible{z-index:5;outline:2px solid var(--accent);outline-offset:-3px}.piano-key-white{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)));min-width:0;box-shadow:inset -1px 0 0 color-mix(in oklch, var(--foreground) 7%, 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