/*
 * Octotune's site: the pages outside the app (tools/site, docs/site.md).
 * Paper, ink and the sea (docs/brand.md, docs/brand-strategy.md §5): every
 * page is a sheet of parchment on a room, in navy ink with a little teal;
 * the five-line staff and noteheads as ornament; buttons shaped like the
 * front of a piano key. The home page is concept B, "Two hands, one piano":
 * the grown-up's part in pen and ink, the child's in the picture book's
 * colours, one keyboard under both.
 *
 * Light and dark are each drawn, not inverted. At night the room goes dark
 * (Adult's night, #0f1117) and the paper stays paper, turned down a little
 * as under a lamp, its ink still navy. Two faces, served from the site
 * itself: no script, no font service, no images but the site's own files.
 *
 * Text colours are chosen for contrast (4.5:1 for body text, 3:1 for large
 * type): the brand teal itself is for surfaces and pictures; links, small
 * teal text and the keys use its darker shades.
 *
 * A relative url() names a file of the site's own (build.ts CSS_ASSETS), which
 * the build writes under /site/ by its contents' hash and names here.
 */

/*
 * Fraunces (optical size 9–144, weight 300–900) for titles; Atkinson
 * Hyperlegible Next (weight 200–800, and an italic) for everything else.
 * WOFF2 first (tools/site/fonts, cut to this unicode-range), then the app's
 * own WOFF (public/fonts). Latin only, as the files are; sharps, flats and
 * arrows come from the fallback in each stack below. `swap`: the page reads
 * at once in the fallback, never blank.
 */
@font-face {
  font-family: "Fraunces";
  src: url("/site/fonts/fraunces.4c2378c35d.woff2") format("woff2"), url("/fonts/fraunces.woff") format("woff");
  font-weight: 300 900;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+2000-206F, U+2070-209F, U+20AC;
}

@font-face {
  font-family: "Atkinson Hyperlegible Next";
  src: url("/site/fonts/atkinson-hyperlegible-next.6f5056d260.woff2") format("woff2"), url("/fonts/atkinson-hyperlegible-next.woff") format("woff");
  font-weight: 200 900;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+2000-206F, U+2070-209F, U+20AC;
}

@font-face {
  font-family: "Atkinson Hyperlegible Next";
  src: url("/site/fonts/atkinson-hyperlegible-next-italic.5ceba7048b.woff2") format("woff2"), url("/fonts/atkinson-hyperlegible-next-italic.woff") format("woff");
  font-weight: 200 900;
  font-style: italic;
  font-display: swap;
  unicode-range: U+0000-00FF, U+2000-206F, U+2070-209F, U+20AC;
}

:root {
  --teal: #2fb5a3;
  --teal-dark: #1d8f81;
  --teal-behind: #177a6e;
  --teal-deep: #146b61;
  --teal-shine: #8fe3d5;
  --teal-wash: rgba(29, 143, 129, 0.12);
  --orange: #f28a2e;
  --coral: #e8704f;
  --navy: #16334a;
  --cream: #f6efdd;

  /* The room behind the paper, and the paper itself. */
  --room: #e9dcc0;
  --sheet: #f6eedb;
  --leaf: #fbf6ea;
  --edge: #d6c7a6;
  --ink: var(--navy);
  --pencil: #8f8a7f;
  --hair: rgba(22, 51, 74, 0.16);
  --shadow-leaf: 0 1px 2px rgba(80, 50, 20, 0.1), 0 18px 40px -22px rgba(80, 50, 20, 0.45);
  /* What sits on the room itself (by day the room is paper too). */
  --on-room: var(--navy);
  --on-room-muted: #55616b;
  --room-focus: var(--navy);

  /* The words' tokens, as every page uses them: all on paper. */
  --bg: var(--sheet);
  --surface: var(--leaf);
  --line: #e0d3b5;
  --text: var(--navy);
  --muted: #4f5d69;
  --link: #0f6b60;
  --accent: var(--teal-deep);
  --accent-soft: rgba(47, 181, 163, 0.18);
  --paper: #fffdf7;
  --paper-ink: var(--navy);
  --todo: #fde7c8;
  --todo-line: var(--orange);
  --radius: 20px;
  --radius-sm: 14px;
  --shadow: 0 1px 2px rgba(22, 51, 74, 0.08), 0 8px 24px -12px rgba(22, 51, 74, 0.28);
  --measure: 44rem;
  --wrap: 1160px;
  --gutter: clamp(16px, 4vw, 40px);

  /* Type: two roles (brand-strategy §5.3), each face first, then a fallback close to it that has the symbols it leaves out. */
  --font-ui: "Atkinson Hyperlegible Next", system-ui, -apple-system, "Segoe UI", "Segoe UI Symbol", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Segoe UI Symbol", serif;

  /*
   * The piano-key button (brand-strategy §5.4): the front of a key, square
   * at the top and rounded below, on a soft shadow; pressed, it dips a
   * little and the shadow shortens. Never a raised face on a darker lip.
   * White on the brand's darker teal (#177a6e, 5.2:1); the body teal is
   * too light for white words.
   */
  --key-bg: var(--teal-behind);
  --key-bg-hover: var(--teal-deep);
  --key-text: #ffffff;
  --key-radius: 3px 3px 12px 12px;
  --key-radius-big: 4px 4px 14px 14px;
  --key-shadow: 0 1px 2px rgba(22, 51, 74, 0.2), 0 10px 18px -8px rgba(22, 51, 74, 0.45);
  --key-shadow-pressed: 0 1px 1px rgba(22, 51, 74, 0.25), 0 3px 6px -3px rgba(22, 51, 74, 0.35);
  --key-press: 2px;
  --key-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.22);
  --key-outline: var(--teal-behind);
  --key-outline-text: var(--teal-deep);
  --key-outline-bg: rgba(255, 253, 247, 0.6);
  --key-black-bg: var(--navy);
  --key-black-hover: #0d2233;
  --key-black-text: #ffffff;

  /* The focus ring: navy on the paper (11:1 and more). What sits on a dark ground sets its own (--room-focus, the coral orange). */
  --focus-ring: var(--navy);
  color-scheme: light dark;
}

/* The night: the room goes dark; the paper stays paper, turned down a little, its ink still navy. */
@media (prefers-color-scheme: dark) {
  :root {
    --room: #0f1117;
    --sheet: #e9dfc7;
    --leaf: #efe6d0;
    --edge: #b9aa8a;
    --line: #cfc09f;
    --muted: #4a5663;
    --on-room: #efe8d8;
    --on-room-muted: #a3adb8;
    --room-focus: var(--orange);
    --paper: #f6efdd;
    --key-outline-bg: rgba(239, 230, 208, 0.9);
    --key-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 18px -8px rgba(0, 0, 0, 0.7);
    --key-shadow-pressed: 0 1px 1px rgba(0, 0, 0, 0.45), 0 3px 6px -3px rgba(0, 0, 0, 0.6);
    --shadow-leaf: 0 1px 2px rgba(0, 0, 0, 0.5), 0 24px 50px -20px rgba(0, 0, 0, 0.9);
    --focus-ring: var(--navy);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 16px;
}

body {
  margin: 0;
  background: var(--room);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-x: clip;
}

a {
  color: var(--link);
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 6px;
}

img,
svg {
  max-width: 100%;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  z-index: 20;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: var(--leaf);
  color: var(--ink);
  font-weight: 700;
}

.skip:focus {
  left: 8px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* The mark brings its own small navy tile, rounded (config.ts SITE_MARK): the light keys need it on the parchment, and on the navy footer it melts into the ground. */
.mark {
  display: block;
}

/* Paper: the grain over a warm gradient. Anything with .paper is a sheet, in navy ink, by day and by night. */
.paper {
  --focus-ring: var(--navy);
  background-color: var(--sheet);
  background-image: url("/site/paper.ed735946ff.svg"), radial-gradient(120% 90% at 50% 0, rgba(255, 252, 242, 0.7), rgba(255, 252, 242, 0) 60%), radial-gradient(140% 120% at 50% 50%, rgba(0, 0, 0, 0) 55%, rgba(120, 84, 40, 0.12));
  color: var(--ink);
}

/* On the room: the ring and the words follow the room, dark at night. */
.on-room {
  --focus-ring: var(--room-focus);
  color: var(--on-room);
}

/* --- The parchment bar: Adult's Paper top bar in the app, on every page ----------------- */

.bar {
  position: relative;
  z-index: 5;
  border-bottom: 1px solid var(--hair);
  background-color: #f3e8cf;
  background-image: url("/site/paper.ed735946ff.svg");
}

.bar__row {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: var(--wrap);
  min-height: 61px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.bar__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--ink);
  text-decoration: none;
}

.bar__name {
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-weight: 650;
  font-size: 1.4rem;
  line-height: 1;
  letter-spacing: -0.005em;
}

.bar__nav {
  margin-right: auto;
}

.bar__nav ul {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.bar__nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 10px;
  border-bottom: 2px solid transparent;
  color: var(--ink);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  white-space: nowrap;
}

/* The section the page is in, underlined in teal, as the app's top bar marks its tab. */
.bar__nav a:hover,
.bar__nav a[aria-current="page"] {
  border-bottom-color: var(--teal-dark);
}

.bar__nav a[aria-current="page"] {
  border-bottom-width: 3px;
}

.bar__end {
  display: flex;
  align-items: center;
  gap: 12px;
}

.signin {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 4px;
  color: var(--teal-deep);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
}

.signin:hover {
  text-decoration: underline;
}

/*
 * A grown-up signed in on this device (r.js sets <html data-signed-in> in the
 * head, before anything is drawn): "I already have an account" is never
 * shown, and the Sign in links wait, out of sight but keeping their place,
 * until the script has made them "Account" (data-signed-in="shown").
 */
[data-signed-in] [data-sign-in-only] {
  display: none;
}

[data-signed-in=""] a[data-account] {
  visibility: hidden;
}

/*
 * A phone or a tablet: the name and the two ways in on the first row, the
 * sections on a row of their own that never wraps. All five fit from
 * 360 px; narrower, the row scrolls sideways, running to the screen's
 * edges so the last link is cut there, which says so.
 */
@media (max-width: 900px) {
  .bar__row {
    flex-wrap: wrap;
    gap: 0 12px;
    padding-top: 6px;
  }

  .bar__brand {
    margin-right: auto;
  }

  .bar__nav {
    order: 3;
    flex: 1 0 100%;
    margin: 0 calc(-1 * var(--gutter));
    border-top: 1px solid var(--hair);
  }

  .bar__nav ul {
    gap: 0;
    padding: 0 calc(var(--gutter) - 8px);
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
  }

  .bar__nav ul::-webkit-scrollbar {
    display: none;
  }

  .bar__nav li {
    flex: none;
  }

  .bar__nav a {
    padding: 0 8px;
  }
}

@media (max-width: 420px) {
  .bar__brand {
    gap: 8px;
  }

  .bar__name {
    font-size: 1.2rem;
  }

  .bar .mark {
    width: 32px;
    height: 32px;
  }

  .bar__end {
    gap: 6px;
  }

  .signin {
    font-size: 0.88rem;
  }

  .bar .key--small {
    padding: 0 10px;
    font-size: 0.85rem;
  }
}

/* --- The footer, on the piano's navy, under the keys' edge ------------------------------- */

.keyslip {
  position: relative;
  height: 34px;
  background: linear-gradient(#0f1117 0 0) 0 0 / 100% 4px no-repeat, repeating-linear-gradient(90deg, #fffdf7 0 38px, #cfc2a6 38px 40px);
}

/* The black keys, in their twos and threes. */
.keyslip::after {
  content: "";
  position: absolute;
  inset: 0 0 12px;
  background: repeating-linear-gradient(90deg, transparent 0 26px, #16334a 26px 50px, transparent 50px 66px, #16334a 66px 90px, transparent 90px 146px, #16334a 146px 170px, transparent 170px 186px, #16334a 186px 210px, transparent 210px 226px, #16334a 226px 250px, transparent 250px 280px);
}

.foot {
  --focus-ring: var(--orange);
  padding: 48px var(--gutter) 28px;
  background: var(--navy);
  color: #efe8d8;
}

.foot a {
  color: #efe8d8;
}

.foot__row {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 2fr);
  gap: 32px;
  max-width: var(--wrap);
  margin: 0 auto;
}

.foot__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 650;
  font-size: 1.4rem;
  line-height: 1;
}

.foot__name p {
  margin: 0 0 0.8em;
}

.foot__promise {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.4;
}

.foot__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.foot h2 {
  margin: 0 0 8px;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 1rem;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.08em;
}

.foot ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.foot li a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-weight: 600;
  text-decoration: none;
}

.foot li a:hover {
  text-decoration: underline;
}

.foot__small {
  max-width: var(--wrap);
  margin: 28px auto 0;
  color: #c9d0d8;
  font-size: 0.875rem;
}

@media (max-width: 760px) {
  .foot__row {
    grid-template-columns: 1fr;
  }

  .foot__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* --- A page: one sheet of paper on the room --------------------------------------------- */

.sheet {
  max-width: 72rem;
  margin: 28px auto 48px;
  padding: 4px 0 40px;
  border: 1px solid var(--edge);
  border-radius: 6px;
  box-shadow: var(--shadow-leaf);
}

@media (max-width: 760px) {
  .sheet {
    margin: 0;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.92rem;
  color: var(--muted);
}

.crumbs li + li::before {
  content: "›";
  margin-right: 4px;
}

.main {
  padding-top: 24px;
}

.main > * {
  max-width: var(--measure);
}

.main > .cards,
.main > .notes,
.main > section,
.main > nav,
.main > .table-wrap,
.main > .opening {
  max-width: none;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-weight: 650;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

h1 {
  margin: 8px 0 12px;
  font-size: clamp(2rem, 6vw, 3rem);
}

h2 {
  margin: 40px 0 12px;
  font-size: 1.6rem;
}

h3 {
  margin: 24px 0 8px;
  font-size: 1.22rem;
}

.lede,
.answer {
  font-size: 1.2rem;
  color: var(--text);
}

/*
 * The long reads (the guides, the FAQ) open with an illuminated capital, as
 * a copyist's manuscript does: the first letter of the first paragraph,
 * large, in its frame. The paragraph holds its own float, so no heading
 * ever wraps round it.
 */
.main--illuminated > h1 + p {
  display: flow-root;
}

.main--illuminated > h1 + p::first-letter {
  float: left;
  margin: 0.08em 0.14em 0 0;
  padding: 0.14em 0.2em 0.1em;
  background: url("/site/initial.436b1a668f.svg") 0 0 / 100% 100% no-repeat;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 3.3em;
  line-height: 0.8;
}

.muted {
  color: var(--muted);
  font-weight: 500;
}

.aside,
.byline {
  color: var(--muted);
  font-size: 0.95rem;
}

.byline {
  margin-top: 40px;
}

.tip {
  margin: 20px 0;
  padding: 12px 16px;
  border-left: 6px solid var(--teal);
  border-radius: var(--radius-sm);
  background: var(--teal-wash);
}

.tip p {
  margin: 6px 0;
}

/* Kept in the page (the build and check:dist count them, and the page stays
   noindex while any is left), but never shown to a visitor: a page waiting
   for its words reads as a shorter page, not as a note to ourselves. Delete
   the display rule to see them while writing. */
.todo-copy {
  display: none;
  margin: 20px 0;
  padding: 12px 16px;
  border: 2px dashed var(--todo-line);
  border-radius: var(--radius-sm);
  background: var(--todo);
}

.todo-copy p {
  margin: 0;
}

/* --- Keys: the front of a piano key ---------------------------------------------------- */

.key,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border: 0;
  border-radius: var(--key-radius);
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: transform 156ms cubic-bezier(0.2, 0.9, 0.3, 1), box-shadow 156ms cubic-bezier(0.2, 0.9, 0.3, 1), background-color 156ms ease;
}

.key,
.button--go {
  background: var(--key-bg);
  color: var(--key-text);
  box-shadow: var(--key-highlight), var(--key-shadow);
}

.key:hover,
.button--go:hover {
  background: var(--key-bg-hover);
}

.key:active,
.button:active {
  transform: translateY(var(--key-press));
}

.key:active,
.button--go:active {
  box-shadow: var(--key-highlight), var(--key-shadow-pressed);
}

/* A secondary action: an outlined key. */
.key--outline,
.button--outline {
  background: var(--key-outline-bg);
  color: var(--key-outline-text);
  box-shadow: inset 0 0 0 2px var(--key-outline), var(--key-shadow);
}

.key--outline:hover,
.button--outline:hover {
  background: var(--leaf);
}

.key--outline:active,
.button--outline:active {
  box-shadow: inset 0 0 0 2px var(--key-outline), var(--key-shadow-pressed);
}

/* A black key. */
.button--dark {
  background: var(--key-black-bg);
  color: var(--key-black-text);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), var(--key-shadow);
}

.button--dark:hover {
  background: var(--key-black-hover);
}

.key--small,
.button--small {
  padding: 0 14px;
  font-size: 0.95rem;
}

.key--big,
.button--big {
  min-height: 56px;
  padding: 0 26px;
  border-radius: var(--key-radius-big);
  font-size: 1.125rem;
}

.cta-row {
  margin: 24px 0;
}

@media (prefers-reduced-motion: reduce) {
  .key,
  .button {
    transition: none;
  }

  .key:active,
  .button:active {
    transform: none;
  }
}

/* --- Cards and lists ----------------------------------------------------------------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr));
  gap: 14px;
  margin: 20px 0;
  padding: 0;
  list-style: none;
}

.card__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  height: 100%;
  padding: 18px 18px 20px;
  border: 1px solid var(--edge);
  border-radius: 6px 6px 18px 18px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
}

.card__link:hover {
  border-color: var(--teal-dark);
}

.card__title {
  font-weight: 800;
  font-size: 1.12rem;
  color: var(--accent);
}

.card__text {
  color: var(--muted);
}

.song-list,
.guide-list {
  padding-left: 1.4em;
}

.song-list li,
.guide-list li {
  margin: 6px 0;
}

.song-list__meta {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
}

.steps li {
  margin: 6px 0;
}

.around {
  margin-top: 32px;
}

/* --- Tables ---------------------------------------------------------------------------- */

.table-wrap {
  overflow-x: auto;
  margin: 16px 0;
  border: 1px solid var(--edge);
  border-radius: 6px;
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

tr:last-child th,
tr:last-child td {
  border-bottom: 0;
}

thead th {
  font-size: 0.9rem;
  color: var(--muted);
}

tbody th {
  font-weight: 750;
}

.facts th {
  width: 9.5rem;
  color: var(--muted);
  font-weight: 700;
}

/* --- Music: notes on the staff, a song's opening, the letters ------------------------ */

.notes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr));
  gap: 14px;
  margin: 16px 0;
}

.note {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 12px;
  border: 1px solid var(--edge);
  border-radius: 6px 6px 18px 18px;
  background: var(--surface);
  scroll-margin-top: 16px;
}

.note h3 {
  margin: 4px 0 6px;
}

.note dl {
  margin: 0;
  font-size: 0.95rem;
}

/* A small label: letter-spaced small capitals, never capitals. */
.note dt {
  color: var(--muted);
  font-weight: 700;
  font-size: 0.95rem;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.05em;
}

.note dd {
  margin: 0 0 6px;
}

.staff {
  flex: none;
  width: 96px;
  height: auto;
  border-radius: var(--radius-sm);
  background: var(--paper);
}

.staff__accidental {
  fill: var(--paper-ink);
  font-size: 22px;
  font-family: var(--font-ui);
}

.opening {
  margin: 24px 0;
}

.opening__art {
  max-width: 36rem;
  padding: 10px 14px;
  border: 1px solid var(--edge);
  border-radius: 6px;
  background: var(--paper);
}

.opening__svg {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 200 / 60;
}

.opening figcaption {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

.letters {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 12rem), 1fr));
  gap: 8px;
  padding: 0;
  list-style: none;
}

.letters li {
  padding: 8px 12px;
  border: 1px solid var(--edge);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.letters__bar {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

.letters__notes {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 10px;
  font-size: 1.3rem;
  font-weight: 850;
}

.letters__note sub {
  margin-left: 1px;
  color: var(--muted);
  font-size: 0.62em;
  font-weight: 700;
}

.credits {
  padding-left: 1.2em;
}

.faq__item h3 {
  margin-bottom: 4px;
}

/* A song's opening (src/components/SongCover.tsx) is the app's engraver's pen: its stylesheet,
   src/styles/engrave.css, is added to this one by build.ts; here, its ink and paper. */
.sg-engr {
  --engr-staff: color-mix(in srgb, var(--paper-ink) 75%, transparent);
  --engr-page: var(--paper);
  --engr-time-font: Georgia, "Times New Roman", serif;
  color: var(--paper-ink);
}

.sg-engr .engr .tuplet {
  fill: currentColor;
  font: italic 700 14px Georgia, "Times New Roman", serif;
  text-anchor: middle;
}

/* The notes on the guides' staves (diagrams.tsx NoteOnStaff), drawn here on paper in both themes. */
.sg-engr__line {
  stroke: var(--paper-ink);
  stroke-width: 0.75;
  opacity: 0.75;
}

.staff .sg-engr__line {
  stroke-width: 1.2;
}

.sg-engr__line--ledger {
  opacity: 1;
}

.sg-engr__ink {
  fill: var(--paper-ink);
}

.sg-engr__paper {
  fill: var(--paper);
}

.sg-engr__clef {
  color: var(--paper-ink);
}

/* --- The home page (landing.tsx): concept B, "Two hands, one piano" -------------------------- */

.sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

/* The notes on the hero's staff carry their letters (src/art/PaintedNote.tsx) where the
   staff is wide enough to read them; on a narrower page they would be under 10 px. (The
   rule names the letter alone: it is matched inside each <use>, where .sprite is not above it.) */
@media (max-width: 720px) {
  .pn__letter {
    display: none;
  }
}

.landing h2 {
  margin: 0 0 12px;
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
}

.landing .lede {
  max-width: 52ch;
  font-size: clamp(1.06rem, 1.6vw, 1.19rem);
  color: inherit;
}

.band-lede {
  max-width: 60ch;
  font-size: 1.125rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 10px;
}

.hero-note {
  max-width: 44ch;
  color: var(--muted);
  font-size: 0.95rem;
}

/* The catchphrase (config.ts TAGLINE) over the h1. */
.eyebrow {
  margin: 0 0 10px;
  color: var(--teal-deep);
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  line-height: 1.3;
}

/* A small label: letter-spaced small capitals, never capitals. */
.kicker {
  margin: 0 0 6px;
  color: var(--teal-deep);
  font-weight: 700;
  font-size: 1rem;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.08em;
  line-height: 1.3;
}

.more {
  color: var(--teal-deep);
  font-weight: 700;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}

.more::after {
  content: " →";
}

.on-room .more {
  color: var(--on-room);
}

/* Not here yet: pencilled in, on a dashed tag. */
.coming {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 8px 2px;
  border: 1.5px dashed var(--pencil);
  border-radius: 3px 3px 9px 9px;
  color: var(--muted);
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 0.8rem;
  line-height: 1.4;
  vertical-align: 2px;
  transform: rotate(-1.5deg);
}

/* Noteheads as bullets: a tilted oval before each line. */
.noteheads {
  margin: 0 0 1em;
  padding: 0;
  list-style: none;
}

.noteheads li {
  position: relative;
  margin: 0 0 0.6em;
  padding-left: 28px;
}

.noteheads li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.42em;
  width: 14px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  transform: rotate(-22deg);
}

.noteheads--teal li::before {
  background: var(--teal-dark);
}

/* The drawings' ink: Octo in ink, the staff, the keyboard. */
.octo-ink__ink {
  fill: var(--ink);
}

.octo-ink__wash {
  fill: var(--ink);
  opacity: 0.085;
}

.octo-ink__wash--low {
  opacity: 0.07;
}

.octo-ink__light {
  fill: #f6efdd;
}

.keyboard {
  display: block;
  width: 100%;
  height: auto;
}

.kb-w--ink {
  fill: var(--leaf);
  stroke: var(--ink);
  stroke-width: 1.6;
}

.kb-w--kid {
  fill: #fffdf7;
  stroke: #e6d9bd;
  stroke-width: 1.5;
}

.kb-b--ink {
  fill: var(--ink);
}

.kb-hatch {
  fill: none;
  stroke: rgba(246, 239, 221, 0.28);
  stroke-width: 1.1;
}

.kb-b--kid {
  fill: #2b2d42;
}

.kb-b-shine {
  fill: rgba(255, 255, 255, 0.1);
}

.kb-tint {
  opacity: 0.22;
}

.kb-tint--on {
  opacity: 1;
}

.kb-dot {
  fill: var(--teal-dark);
}

/* The hero: the title page of a duet. */
.duet {
  border-bottom: 1px solid var(--hair);
}

.duet__title {
  padding: clamp(24px, 4vw, 52px) var(--gutter) 10px;
  text-align: center;
}

.duet__title .lede,
.duet__title .hero-note {
  margin-inline: auto;
}

.duet__title .actions {
  justify-content: center;
}

.duet h1 {
  margin: 0 0 16px;
  font-size: clamp(2.6rem, 6vw, 4.75rem);
  font-weight: 680;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

/* Over the catchphrase: the family on one piano bench, each player with their own avatar (drawn by src/art/avatar.ts) and name. Small, so the keys stay high. */
.bench {
  width: fit-content;
  max-width: 100%;
  margin: 0 auto 14px;
}

.bench__players {
  display: flex;
  justify-content: center;
  gap: clamp(10px, 1.4vw + 6px, 22px);
  margin: 0;
  padding: 0 clamp(8px, 1.2vw + 4px, 18px);
  list-style: none;
}

.bench__players li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: var(--ink);
  font-weight: 700;
  font-size: clamp(0.8125rem, 0.3vw + 0.75rem, 0.9375rem);
  line-height: 1.2;
}

/* Each avatar a round portrait: a hairline and a soft shadow, so the pale backdrops (the staff paper) still read as a disk on the page's paper. */
.bench__face {
  display: block;
  width: clamp(48px, 3vw + 37px, 66px);
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(22, 51, 74, 0.13), 0 4px 8px -4px rgba(80, 50, 20, 0.4);
}

.bench__av {
  display: block;
  width: 100%;
  height: auto;
}

.bench__seat {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 3px;
}

.bench__top {
  fill: var(--ink);
}

.bench__leg {
  stroke: var(--ink);
  stroke-width: 6;
  stroke-linecap: round;
}

.duet__art {
  position: relative;
  padding: 10px var(--gutter) 34px;
}

/* The child's half of the page is a little lighter: the picture book's paper. */
.duet__art::before {
  content: "";
  position: absolute;
  inset: 0 0 0 50%;
  background: linear-gradient(rgba(253, 246, 231, 0), rgba(253, 246, 231, 0.96) 90px);
}

.duet__art > * {
  position: relative;
}

.duet__score {
  display: block;
  width: 100%;
  max-width: 1100px;
  height: auto;
  margin: 0 auto;
  color: var(--ink);
}

.d-ink {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.5;
}

.d-ink-fill {
  fill: var(--ink);
}

.d-kid-line {
  fill: none;
  stroke: #b9ab8d;
  stroke-width: 2.2;
  stroke-linecap: round;
}

.d-clef {
  color: var(--ink);
}

.d-clef--kid {
  color: #8a7d62;
}

.d-part {
  fill: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 26px;
}

.d-part--sub {
  fill: var(--muted);
  font-style: italic;
  font-weight: 500;
  font-size: 17px;
}

.duet__kb {
  max-width: 1100px;
  margin: -4px auto 0;
}

.duet__kb .keyboard {
  filter: drop-shadow(0 12px 14px rgba(80, 50, 20, 0.18));
}

.duet__hands {
  display: grid;
  grid-template-columns: 1fr 1fr;
  max-width: 1100px;
  margin: 10px auto 0;
  color: var(--muted);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
}

.duet__hands span:last-child {
  text-align: right;
}

/* How it works: three white keys, with black keys between them. */
.keys-band {
  padding: 56px 0 48px;
  background: var(--room);
}

.keys-band h2 {
  color: var(--on-room);
}

.keys-band .band-lede {
  color: var(--on-room-muted);
}

.keycards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 34px;
  margin: 26px 0 20px;
  padding: 0;
  list-style: none;
}

.keycard {
  --focus-ring: var(--navy);
  position: relative;
  min-height: 250px;
  padding: 44px 22px 28px;
  border: 1.5px solid var(--edge);
  border-top: 0;
  border-radius: 0 0 18px 18px;
  background: #fffdf7;
  box-shadow: 0 14px 20px -14px rgba(80, 50, 20, 0.5);
  color: var(--ink);
}

/* The black key between two white ones. */
.keycard + .keycard::before {
  content: "";
  position: absolute;
  top: 0;
  left: -44px;
  z-index: 2;
  width: 54px;
  height: 150px;
  border-radius: 0 0 8px 8px;
  background: var(--navy);
  box-shadow: inset 0 -6px 0 rgba(255, 255, 255, 0.08);
}

.keycard h3 {
  margin: 0 0 8px;
  font-size: 1.3rem;
}

.keycard p {
  margin: 0;
  font-size: 1rem;
}

.keycard__finger {
  position: absolute;
  top: 12px;
  left: 22px;
  color: var(--teal-deep);
  font-weight: 700;
  font-size: 0.95rem;
}

.keycard--coming {
  background: repeating-linear-gradient(-45deg, #fffdf7 0 10px, #f7f0e0 10px 11px);
}

/* The two parts, side by side: the grown-up's in ink, the child's in the picture book. */
.parts {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.part {
  min-width: 0;
  padding: clamp(40px, 5vw, 72px) clamp(22px, 4vw, 64px) 56px;
}

.part--primo {
  --focus-ring: var(--navy);
  background-color: #fdf6e7;
  background-image: radial-gradient(90% 50% at 50% 0, #fffaf0, rgba(255, 250, 240, 0));
  color: var(--ink);
}

.part__name {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  color: var(--muted);
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 600;
  font-size: 1.125rem;
}

.part__name::after {
  content: "";
  flex: 1;
  border-top: 1px solid currentColor;
  opacity: 0.4;
}

.part .noteheads li,
.part .lede {
  color: var(--ink);
}

.tempo {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 4px 0 20px;
}

.tempo__mark {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.ticks {
  display: inline-flex;
  gap: 2px;
}

.ticks i {
  display: block;
  width: 3px;
  height: 14px;
  border-radius: 1px;
  background: var(--teal-dark);
}

.ticks i.off {
  background: var(--hair);
}

/* The Kids half's stars: Octo and his friends from the reef, standing on the sand, each named. */
.cast-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: clamp(4px, 1.4vw, 14px);
  margin: 8px 0 22px;
  padding: 0 4px 8px;
  border-bottom: 4px solid #f3dcae;
  list-style: none;
}

.cast-row li {
  display: flex;
  flex: 0 1 auto;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 0;
}

.cast-row__pic {
  display: block;
  max-width: 100%;
}

.cast-row__pic svg {
  display: block;
  width: 100%;
  height: auto;
}

.cast-row__pic--octo {
  width: clamp(56px, 11vw, 96px);
}

.cast-row__pic--pim {
  width: clamp(58px, 11vw, 100px);
}

.cast-row__pic--moss {
  width: clamp(64px, 12.5vw, 112px);
}

.cast-row__pic--luma {
  width: clamp(38px, 7.3vw, 66px);
}

.cast-row__pic--gilly {
  width: clamp(50px, 9.6vw, 88px);
}

.cast-row__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
}

.part__art {
  margin: 10px 0 22px;
  overflow: hidden;
  border: 1px solid var(--edge);
  border-radius: 4px;
  background: #f6efdd;
}

.part__art img,
.shelf img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.part__art--kid {
  border: 10px solid #fff;
  border-radius: 22px;
  box-shadow: 0 16px 30px -18px rgba(80, 50, 20, 0.5);
}

/* Tutti: the whole family, in words (their bench is the hero's picture). The teachers' note penciled in beside the text. */
.tutti {
  padding: clamp(44px, 6vw, 80px) 0;
  border-top: 1px solid var(--hair);
}

.tutti__row {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  column-gap: clamp(32px, 5vw, 72px);
  align-items: start;
}

.tutti__row > .part__name,
.tutti__row > h2 {
  grid-column: 1 / -1;
}

.tutti__row > h2 {
  margin-bottom: 18px;
}

.tutti__text > .lede {
  margin-top: 0;
}

.tutti__text > :last-child {
  margin-bottom: 0;
}

.tutti__row > .pencil-note {
  margin-top: 4px;
}

.pencil-note {
  margin-top: 20px;
  padding: 14px 16px;
  border: 1.5px dashed var(--pencil);
  border-radius: 4px 4px 14px 14px;
}

.pencil-note h3 {
  margin: 0 0 6px;
  font-size: 1.2rem;
}

.pencil-note p {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

/* The songbooks: two books open on the room, the grown-up's in ink, the child's in colour. */
.repertoire {
  padding: clamp(44px, 6vw, 80px) 0 40px;
  background: var(--room);
}

.repertoire h2 {
  color: var(--on-room);
}

.repertoire .band-lede,
.repertoire__more {
  color: var(--on-room-muted);
}

.repertoire__more a {
  color: var(--on-room);
}

.repertoire__cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  max-width: 1240px;
  margin: 24px auto 18px;
  padding: 0 var(--gutter);
}

.repertoire__col {
  padding: 28px clamp(18px, 3vw, 36px) 32px;
  border-radius: 6px 0 0 6px;
}

.repertoire__col--kid {
  --focus-ring: var(--navy);
  border-radius: 0 6px 6px 0;
  background: #fdf6e7;
  color: var(--ink);
}

.repertoire__col h3 {
  margin: 0 0 16px;
  font-size: 1.5rem;
}

.repertoire__col h3 span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-style: italic;
  font-weight: 500;
  font-size: 1rem;
}

.shelf {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.shelf__pic {
  overflow: hidden;
  border: 1px solid var(--edge);
  border-radius: 4px;
  background: #f6efdd;
}

.shelf--kid .shelf__pic {
  border: 6px solid #fff;
  border-radius: 14px;
  box-shadow: 0 10px 18px -12px rgba(80, 50, 20, 0.6);
}

.shelf h4 {
  margin: 8px 0 2px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.06rem;
  line-height: 1.25;
}

.shelf p {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

/* The guides: four cards, each with a staff along its top edge. */
.guides-band {
  padding: clamp(44px, 6vw, 72px) 0;
  border-top: 1px solid var(--hair);
}

.guide-cards {
  display: grid;
  gap: 16px;
  margin: 20px 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 600px) {
  .guide-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .guide-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.guide-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 36px 18px 20px;
  border: 1px solid var(--edge);
  border-radius: 6px 6px 18px 18px;
  background: var(--leaf) repeating-linear-gradient(to bottom, rgba(22, 51, 74, 0.22) 0 1px, transparent 1px 4px) no-repeat 18px 16px / calc(100% - 36px) 17px;
  color: var(--ink);
  text-decoration: none;
}

.guide-card:hover {
  border-color: var(--teal-dark);
}

.guide-card__title {
  font-family: var(--font-display);
  font-weight: 650;
  font-size: 1.2rem;
  line-height: 1.25;
}

.guide-card__text {
  color: var(--muted);
  font-size: 0.95rem;
}

/* The promise, on the piano's fallboard: navy wood with a cream inlay line. */
.fallboard {
  --focus-ring: var(--orange);
  padding: 56px 0 50px;
  background: var(--navy);
  box-shadow: inset 0 10px 0 #0f2536, inset 0 -2px 0 #0d2233;
  color: #efe8d8;
  text-align: center;
}

.fallboard .wrap {
  max-width: 1000px;
  padding-top: 34px;
  padding-bottom: 30px;
  border: 1px solid rgba(239, 232, 216, 0.35);
  border-radius: 6px;
}

.fallboard h2 {
  color: #efe8d8;
}

.fallboard__inlay {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  padding: 6px 16px;
  border-radius: 40px;
  background: #f6efdd;
  color: var(--navy);
  font-family: var(--font-display);
  font-weight: 650;
  font-size: 1.375rem;
}

.fallboard__lead {
  max-width: 34ch;
  margin: 0 auto 26px;
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  line-height: 1.35;
}

.fallboard__list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin: 0 auto 22px;
  padding: 0;
  list-style: none;
  text-align: left;
}

.fallboard__list h3 {
  margin: 0 0 6px;
  color: var(--teal-shine);
  font-size: 1.2rem;
}

.fallboard__list p {
  margin: 0;
  color: #c9d0d8;
}

.fallboard .more {
  color: var(--teal-shine);
}

/* The prices. */
.plans {
  padding: clamp(44px, 6vw, 80px) 0;
  border-top: 1px solid var(--hair);
}

.plans__row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  align-items: start;
  margin-top: 22px;
}

.plan {
  height: 100%;
  padding: 22px 22px 24px;
  border: 1px solid var(--edge);
  border-radius: 6px 6px 18px 18px;
  background: var(--leaf);
}

.plan h3 {
  margin: 0;
  font-size: 1.5rem;
}

.plan__price {
  margin: 6px 0 14px;
  color: var(--muted);
}

.plan__price b {
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 650;
  font-size: 2.25rem;
  line-height: 1;
}

.plan__price span {
  font-size: 0.95rem;
}

.plan--plus {
  border-color: var(--teal-dark);
  box-shadow: inset 0 0 0 1px var(--teal-dark);
}

.plan__badge {
  display: inline-block;
  margin: 0 0 8px;
  padding: 2px 10px 3px;
  border-radius: 3px 3px 10px 10px;
  background: var(--teal-wash);
  color: var(--teal-deep);
  font-weight: 700;
  font-size: 0.875rem;
}

.plan__pearl {
  display: block;
  width: 40px;
  height: 40px;
  margin-bottom: 6px;
}

.small {
  color: var(--muted);
  font-size: 0.875rem;
}

/* Questions, and the last call. */
.coda {
  padding: clamp(44px, 6vw, 80px) 0;
  border-top: 1px solid var(--hair);
}

.coda__row {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.faq-q {
  padding: 4px 0;
  border-top: 1px solid var(--hair);
}

.faq-q summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.2rem;
  line-height: 1.3;
  list-style: none;
  cursor: pointer;
}

.faq-q summary::-webkit-details-marker {
  display: none;
}

.faq-q summary::after {
  content: "+";
  color: var(--teal-deep);
  font-family: var(--font-ui);
  font-size: 1.5rem;
  line-height: 1;
}

.faq-q[open] summary::after {
  content: "−";
}

.faq-q p {
  max-width: 62ch;
  margin: 0 0 14px;
}

.coda__call {
  padding: 30px;
  border: 1px solid var(--edge);
  border-radius: 6px;
  background: var(--leaf);
  text-align: center;
}

.coda__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin: 0 0 14px;
  color: var(--muted);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
}

.coda__mark::before,
.coda__mark::after {
  content: "";
  width: 48px;
  border-top: 1px solid var(--ink);
  opacity: 0.45;
}

/* More about Octotune: the written words, as a readable column. */
.about {
  padding: 10px 0 56px;
}

.about h2 {
  font-size: 1.6rem;
}

.about .prose {
  max-width: var(--measure);
}

.prose h3 {
  margin-top: 28px;
  font-size: 1.25rem;
}

.prose > :first-child {
  margin-top: 0;
}

/* The home page, narrower: one part, one plan, one question at a time. */
@media (max-width: 900px) {
  .keycards {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .keycard {
    min-height: 0;
    border-top: 1.5px solid var(--edge);
    border-radius: 4px 4px 18px 18px;
  }

  .keycard + .keycard::before {
    display: none;
  }

  .parts,
  .tutti__row,
  .coda__row,
  .repertoire__cols,
  .fallboard__list,
  .plans__row {
    grid-template-columns: 1fr;
  }

  .tutti__row > .pencil-note {
    margin-top: 22px;
  }

  .repertoire__col {
    border-radius: 6px 6px 0 0;
  }

  .repertoire__col--kid {
    border-radius: 0 0 6px 6px;
  }
}

@media (max-width: 560px) {
  .duet__art {
    padding-right: 8px;
    padding-left: 8px;
  }

  .d-part {
    font-size: 34px;
  }

  .d-part--sub {
    font-size: 22px;
  }

  .duet__hands {
    font-size: 0.875rem;
  }

  .actions .key {
    width: min(100%, 22rem);
  }

  .shelf {
    grid-template-columns: 1fr 1fr;
  }

  .shelf li:nth-child(3) {
    display: none;
  }

  .fallboard .wrap {
    padding-right: 18px;
    padding-left: 18px;
  }
}

/* ==========================================================================
   The engraver's pen (src/score/engrave/glyphs.ts), wherever it draws: the
   song sheets and a lesson's page (two-bar.css), and every lesson's own
   notation, drawn through src/score/engrave/Pen.tsx (a Meet card, a note
   card, the exercises, concept cards, rhythm, the practice sheet, the end
   screens). One set of weights, in the engraver's units (10 to a staff gap:
   Pen.tsx scales a drawing measured otherwise), so a staff line, a ledger,
   a stem, a head and a clef are the same wherever they are drawn.

   The music is drawn from currentColor: the ink is whatever colour the
   drawing is set in, and a mark (the note to find, a right or a wrong one)
   is one colour change on its group. Three names set the rest:

   - --engr-staff: the staff lines, a quieter ink (by default the ink at 62%);
   - --engr-page: the page, which shows through a hollow head;
   - --engr-time-font: the time signature's face (the serif; Kids' the
     interface face).
   ========================================================================== */

.engr .staff {
  stroke: var(--engr-staff, color-mix(in srgb, currentColor 62%, transparent));
  stroke-width: 1.05;
}

.engr .ledger {
  stroke: currentColor;
  stroke-width: 1.2;
  opacity: 0.8;
}

.engr .barline,
.engr .sysline {
  stroke: currentColor;
  stroke-width: 1.35;
}

.engr .stem {
  stroke: currentColor;
  stroke-width: 1.3;
  stroke-linecap: round;
}

.engr .ink,
.engr .head {
  fill: currentColor;
}

.engr .hole {
  fill: var(--engr-page, #fff);
}

.engr .pen {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.engr .pen.thin {
  stroke-width: 1.25;
}

.engr .pen.thick {
  stroke-width: 3.1;
  stroke-linecap: butt;
}

.engr .pen.mid {
  stroke-width: 1.8;
}

.engr .rest-q {
  stroke-width: 2.7;
}

.engr .timesig text {
  fill: currentColor;
  font: 700 23px var(--engr-time-font, var(--font-serif));
  font-variation-settings: "opsz" 72;
  text-anchor: middle;
}

/* Kids: the picture book's pen, a little bolder and rounder: the song sheets', a child's sittings'
   and their practice sheet's. */
:is(.tb--kids, .escore--kids, .session--kids, .habits--kids) .engr .staff {
  stroke-width: 1.5;
  stroke-linecap: round;
}

:is(.tb--kids, .escore--kids, .session--kids, .habits--kids) .engr .barline {
  stroke-width: 1.8;
}

:is(.tb--kids, .escore--kids, .session--kids, .habits--kids) .engr .stem {
  stroke-width: 1.8;
}