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:root{--bg:#f5f6f8;--surface:#fff;--fg:#1b2230;--muted:#586174;--line:#d9dde5;--rh:#c2560f;--rh-soft:#fbe3d1;--rh-text:#983f08;--lh:#0f7a86;--lh-soft:#d3eef0;--lh-text:#0b6570;--dot-text:#fff;--key-white:#fff;--key-black:#1b2230;--key-edge:#1b2230;--shadow:#1b22301f;--font-display:var(--font-bricolage), "Segoe UI", system-ui, sans-serif;--font-body:var(--font-atkinson), "Verdana", system-ui, sans-serif;--font-mono:var(--font-atkinson-mono), ui-monospace, "SFMono-Regular", Menlo, monospace}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#12161d;--surface:#1a1f28;--fg:#e8ebf1;--muted:#a2aabb;--line:#2f3642;--rh:#f2924f;--rh-soft:#4a2d1a;--lh:#4cc3cf;--lh-soft:#163d42;--rh-text:#f2924f;--lh-text:#4cc3cf;--dot-text:#12161d;--key-white:#e8ebf1;--key-black:#0b0e13;--key-edge:#0b0e13;--shadow:#00000080;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}:root[data-theme=dark]{--bg:#12161d;--surface:#1a1f28;--fg:#e8ebf1;--muted:#a2aabb;--line:#2f3642;--rh:#f2924f;--rh-soft:#4a2d1a;--lh:#4cc3cf;--lh-soft:#163d42;--rh-text:#f2924f;--lh-text:#4cc3cf;--dot-text:#12161d;--key-white:#e8ebf1;--key-black:#0b0e13;--key-edge:#0b0e13;--shadow:#00000080;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}
*,:after,:before,::backdrop{box-sizing:border-box}::file-selector-button{box-sizing:border-box}html{-webkit-text-size-adjust:100%;tab-size:4}b,strong{font-weight:bolder}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit}[hidden]:where(:not([hidden=until-found])){display:none!important}body{background:var(--bg);color:var(--fg);font-family:var(--font-body);margin:0;font-size:17px;line-height:1.6}h1,h2{font-family:var(--font-display);text-wrap:balance;margin:0;line-height:1.15}h1{letter-spacing:-.01em;font-size:clamp(2rem,6vw,3rem);font-weight:800}h2{font-size:clamp(1.6rem,4.5vw,2.1rem);font-weight:800}a:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid var(--rh);outline-offset:2px}p{max-width:65ch;margin:0}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (prefers-reduced-motion:reduce){*{transition:none!important}}
.wrap{max-width:820px;padding-block:40px 64px;padding-left:max(16px, env(safe-area-inset-left,0px));padding-right:max(16px, env(safe-area-inset-right,0px));gap:28px;margin:0 auto;display:grid}main,.section-page{gap:28px;display:grid}.sec{gap:20px;display:grid}.intro{gap:12px;display:grid}.lede{color:var(--muted);font-size:1.1rem}footer{color:var(--muted);gap:8px;font-size:.9rem;display:grid}footer a{color:inherit}.statement{gap:28px;display:grid}.statement section{gap:12px;display:grid}.statement ul{gap:4px;max-width:65ch;margin:0;padding-left:1.2em;display:grid}.statement a{color:var(--fg)}
.ex-head h2,.legend h2{font-size:1.4rem;font-weight:600}.link-list{gap:12px;margin:0;padding:0;list-style:none;display:grid}.link-list li{background:var(--surface);border:1px solid var(--line);border-radius:10px;gap:4px;padding:16px 18px;display:grid}.link-list a{color:var(--fg);font-family:var(--font-display);font-size:1.3rem;font-weight:800}.link-list p{color:var(--muted)}.ex-head h1{font-size:clamp(1.6rem,5vw,2.2rem)}.legend{border:1px solid var(--line);background:var(--surface);border-radius:10px;gap:10px;padding:16px 18px;display:grid}.legend ul{gap:4px;margin:0;padding-left:1.2em;display:grid}.chip{font-family:var(--font-mono);border-radius:999px;padding:1px 8px;font-size:.85rem;font-weight:600;display:inline-block}.chip.rh{background:var(--rh-soft);color:var(--rh-text)}.chip.lh{background:var(--lh-soft);color:var(--lh-text)}.ex{background:var(--surface);border:1px solid var(--line);border-radius:10px;gap:14px;min-width:0;padding:20px 18px;display:grid}.ex-head{flex-wrap:wrap;align-items:baseline;gap:12px;display:flex}.num{font-family:var(--font-mono);color:var(--muted);letter-spacing:.06em;font-size:.85rem;font-weight:600}.steps{gap:4px;max-width:65ch;margin:0;padding-left:1.2em;display:grid}.kb-label{color:var(--muted);letter-spacing:.04em;text-transform:uppercase;font-size:.85rem}.count{aspect-ratio:1;box-sizing:border-box;border:4px solid var(--rh);background:var(--surface);width:24cqw;color:var(--fg);font-family:var(--font-mono);border-radius:50%;place-items:center;font-size:13cqw;font-weight:700;line-height:1;display:grid;position:absolute;top:42.9578%;left:50%;translate:-50% -50%}.count:empty{display:none}.staves{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;display:grid}.staves>div{gap:6px;min-width:0;display:grid}
.controls{flex-wrap:wrap;align-items:center;gap:10px;display:flex}button{font:inherit;cursor:pointer;border:1px solid var(--line);background:var(--bg);color:var(--fg);border-radius:8px;min-height:44px;padding:8px 14px;font-weight:700}button.play{background:var(--fg);color:var(--bg);border-color:var(--fg);min-width:96px}button:focus-visible{outline:3px solid var(--rh);outline-offset:2px}.confirm{box-sizing:border-box;border:1px solid var(--line);background:var(--surface);max-width:min(440px,100vw - 32px);color:var(--fg);border-radius:12px;padding:20px 22px}.confirm::backdrop{background:#00000080}.confirm h2{font-size:1.4rem;font-weight:600}.confirm p{margin:10px 0 20px}.confirm-buttons{flex-wrap:wrap;justify-content:flex-end;gap:10px;display:flex}.confirm .primary{background:var(--fg);color:var(--bg);border-color:var(--fg)}.seg{border:1px solid var(--line);border-radius:8px;display:inline-flex}.seg button{background:var(--surface);border:0;border-radius:0}.seg button+button{border-left:1px solid var(--line)}.seg button:first-child{border-radius:7px 0 0 7px}.seg button:last-child{border-radius:0 7px 7px 0}.seg button:focus-visible{z-index:1;position:relative}.ex>.seg{justify-self:start}button[aria-pressed=true]{background:var(--fg);color:var(--bg);border-color:var(--fg)}