/* Sample lesson: one reading column, like a lesson handout; chord cards in a
   2-up grid; each exercise is notation plus its own player. Prints as the PDF handout. */

.lesson { --rh: var(--apricot); --rh-soft: #F8E2CF; --lh: var(--espresso); --lh-soft: var(--sand); --hl: #A8551B; }
.lesson__page { max-width: 880px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 56px; }
.lesson__head { display: grid; grid-template-columns: minmax(0, 1fr); gap: 18px; }
.lesson__band { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px 24px; padding: 20px 22px; background: var(--walnut); color: var(--cream); border-radius: var(--r-ui); }
.lesson__band .eyebrow { color: var(--oat); }
.lesson__title { font-size: clamp(32px, 5vw, 48px); line-height: 1; }
.lesson__weeks { display: flex; gap: 6px; }
.lesson__weeks span { width: 44px; height: 6px; border-radius: var(--r-pill); background: var(--smoke); }
.lesson__weeks .is-on { background: var(--apricot); }
.lesson__meta { display: flex; flex-wrap: wrap; gap: 8px; }
.lesson__meta span { font-size: 14px; padding: 4px 12px; border: 1px solid var(--clay); border-radius: var(--r-pill); color: var(--bark); background: var(--parchment); }
.progression { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--espresso); border-bottom: 1px solid var(--hairline); }
.progression div { padding: 14px 4px 12px; display: grid; gap: 2px; }
.progression div + div { border-left: 1px solid var(--hairline); padding-left: 14px; }
.progression b { font-family: var(--serif); font-weight: 400; font-size: clamp(36px, 8vw, 60px); line-height: 1; }
.progression small { font-size: 13px; letter-spacing: 0.08em; color: var(--cocoa); }
.lesson__section { display: grid; grid-template-columns: minmax(0, 1fr); gap: 20px; }

/* Chord cards with a two-hand keyboard diagram, built by lesson.js */
.lesson__legend { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 15px; color: var(--cocoa); }
.lesson__legend i { display: inline-block; width: 12px; height: 12px; border-radius: 50%; margin-right: 6px; vertical-align: -1px; }
.lesson__legend .is-rh { background: var(--rh); }
.lesson__legend .is-lh { background: var(--lh); }
.lesson__chords { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.lcard { display: grid; gap: 12px; min-width: 0; padding: 18px; background: var(--parchment); border: 1px solid var(--hairline); border-radius: var(--r-ui); }
.lcard-top { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.lcard-top b { font-family: var(--serif); font-weight: 400; font-size: 38px; line-height: 1; }
.lcard-top span { font-size: 14px; color: var(--cocoa); }
.hands { display: grid; grid-template-columns: auto 1fr; gap: 2px 12px; margin: 0; font-size: 15px; }
.hands dt { font-weight: 600; }
.hands dd { margin: 0; font-variant-numeric: tabular-nums; }
.kb { width: 100%; height: auto; display: block; }
.kb .white { fill: var(--white); stroke: #B9AB96; stroke-width: 1; cursor: pointer; }
.kb .black { fill: var(--espresso); cursor: pointer; }
.kb .white.rh { fill: var(--rh-soft); }
.kb .white.lh { fill: var(--lh-soft); }
.kb .dot-rh { fill: var(--rh); }
.kb .dot-lh { fill: var(--lh); }
.kb .finger { font: 700 10px var(--sans); text-anchor: middle; fill: var(--espresso); }
.kb .finger-lh { fill: var(--cream); }
.kb .lbl { fill: var(--cocoa); font: 9px var(--sans); text-anchor: middle; }
.hear { justify-self: start; min-height: 44px; padding: 0 18px; border: 1.5px solid var(--espresso); border-radius: var(--r-pill); background: transparent; font-size: 15px; font-weight: 600; cursor: pointer; transition: background-color var(--fast) ease-out; }
.hear:hover { background: var(--sand); }
.tip { border-left: 3px solid var(--apricot); padding: 4px 0 4px 16px; color: var(--bark); max-width: 40em; }
.tip strong { color: var(--espresso); }

/* Exercises */
.exercise { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; padding-top: 20px; border-top: 1px solid var(--hairline); }
.ex-head { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; align-items: baseline; }
.ex-num { font-family: var(--serif); font-size: 44px; line-height: 1; grid-row: span 2; }
.ex-goal { color: var(--cocoa); font-size: 16px; }
.notation { background: var(--white); border: 1px solid var(--hairline); border-radius: var(--r-ui); padding: 8px 6px 2px; color: var(--espresso); overflow-x: auto; }
.notation svg .hl, .notation svg .hl * { fill: var(--hl) !important; }
.audio-msg { font-size: 15px; color: var(--cocoa); }

/* abcjs audio controls, restyled */
.abcjs-inline-audio { height: 52px; padding: 0 10px; border-radius: var(--r-ui); background-color: var(--espresso); display: flex; align-items: center; gap: 2px; }
.abcjs-inline-audio.abcjs-disabled { opacity: 0.5; }
.abcjs-inline-audio .abcjs-btn { display: block; width: 44px; height: 44px; padding: 13px 12px; background: none !important; border: 1px solid transparent; border-radius: var(--r-ui); line-height: 1; cursor: pointer; }
.abcjs-btn g { fill: var(--cream); stroke: var(--cream); }
.abcjs-inline-audio .abcjs-btn:hover g { fill: var(--apricot); stroke: var(--apricot); }
.abcjs-inline-audio .abcjs-btn:focus-visible { outline: 2px solid var(--apricot); outline-offset: -2px; box-shadow: none; }
.abcjs-inline-audio .abcjs-midi-loop.abcjs-pushed, .abcjs-inline-audio .abcjs-midi-reset.abcjs-pushed, .abcjs-inline-audio .abcjs-midi-selection.abcjs-pushed { border-color: var(--apricot); }
.abcjs-inline-audio .abcjs-midi-start .abcjs-pause-svg, .abcjs-inline-audio .abcjs-midi-start .abcjs-loading-svg { display: none; }
.abcjs-inline-audio .abcjs-midi-start.abcjs-pushed .abcjs-play-svg, .abcjs-inline-audio .abcjs-midi-start.abcjs-loading .abcjs-play-svg { display: none; }
.abcjs-inline-audio .abcjs-midi-start.abcjs-pushed .abcjs-pause-svg { display: block; }
.abcjs-inline-audio .abcjs-midi-progress-background { background-color: transparent; height: 8px; border-radius: 4px; border: 2px solid var(--oat); margin: 0 8px 0 10px; position: relative; flex: 1; padding: 0; min-width: 40px; cursor: pointer; }
.abcjs-inline-audio .abcjs-midi-progress-indicator { width: 14px; margin-left: -7px; height: 14px; background-color: var(--apricot); position: absolute; display: inline-block; border-radius: 50%; top: -5px; left: 0; }
.abcjs-inline-audio .abcjs-midi-clock { margin: 0 4px; display: inline-block; font: 14px var(--sans); color: var(--cream); font-variant-numeric: tabular-nums; }
.abcjs-inline-audio .abcjs-tempo-wrapper { font-size: 13px; color: var(--cream); display: flex; align-items: center; white-space: nowrap; }
.abcjs-inline-audio .abcjs-midi-tempo { border-radius: 4px; border: none; margin: 0 2px 0 6px; width: 52px; height: 32px; padding: 2px 4px; font: 14px var(--sans); background: var(--white); color: var(--espresso); }
.abcjs-inline-audio .abcjs-loading .abcjs-loading-svg { display: inherit; }
.abcjs-inline-audio .abcjs-loading { outline: none; animation: abcjs-spin 1s linear infinite; }
.abcjs-inline-audio .abcjs-loading-svg circle { stroke: var(--cream); }
@keyframes abcjs-spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.abcjs-css-warning { display: none; }

/* Play-along */
.song-card { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; padding: 20px; background: var(--parchment); border: 1px solid var(--hairline); border-radius: var(--r-ui); }
.song-card .notation { border: none; padding: 0; background: transparent; }
.song-card__title { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px; font-size: 15px; }
.seg { display: inline-flex; flex-wrap: wrap; justify-self: start; border: 1.5px solid var(--espresso); border-radius: var(--r-pill); overflow: hidden; }
.seg button { min-height: 44px; padding: 0 16px; border: none; background: transparent; font-size: 15px; font-weight: 600; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--espresso); color: var(--cream); }
.seg button:focus-visible { outline-offset: -4px; box-shadow: none; }
.lesson__steps { list-style: decimal; padding-left: 1.3em; display: grid; gap: 6px; max-width: 40em; color: var(--bark); }

/* Practice plan */
.plan-wrap { overflow-x: auto; }
.plan { width: 100%; border-collapse: collapse; font-size: 16px; }
.plan th, .plan td { text-align: left; vertical-align: top; padding: 12px 12px 12px 0; border-bottom: 1px solid var(--hairline); }
.plan th { font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--cocoa); font-weight: 600; }
.plan td:first-child { font-family: var(--serif); font-size: 20px; white-space: nowrap; }
.plan td:last-child { color: var(--cocoa); white-space: nowrap; }
.checks { display: grid; }
.checks li { border-top: 1px solid var(--hairline); }
.checks li:last-child { border-bottom: 1px solid var(--hairline); }
.checks label { display: flex; gap: 12px; align-items: flex-start; padding-block: 12px; cursor: pointer; }
.checks input { width: 22px; height: 22px; margin: 2px 0 0; accent-color: var(--espresso); flex: none; }
.lesson__foot { display: grid; gap: 4px; padding-top: 16px; border-top: 1px solid var(--hairline); font-size: 14px; color: var(--cocoa); }
.print-only { display: none; }

@media (max-width: 620px) {
  .lesson__chords { grid-template-columns: minmax(0, 1fr); }
  .lesson__page { gap: 44px; }
  .abcjs-inline-audio .abcjs-midi-clock { display: none; }
  .abcjs-inline-audio { padding: 0 4px; }
  .abcjs-inline-audio .abcjs-btn { width: 40px; padding: 13px 10px; }
  .abcjs-inline-audio .abcjs-midi-progress-background { min-width: 24px; margin: 0 6px; }
  .abcjs-inline-audio .abcjs-tempo-wrapper { font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) { .abcjs-inline-audio .abcjs-loading { animation: none; } }

@media print {
  @page { size: letter; margin: 0.55in 0.6in; }
  body { font-size: 11.5pt; }
  .lesson, .lesson .wrap { padding: 0; max-width: none; }
  .screen-only, .abcjs-inline-audio, .audio, .hear, .seg { display: none !important; }
  .print-only { display: block; }
  /* Chromium fragments grid poorly across pages, so print uses block flow. */
  .lesson__page, .lesson__section, .exercise, .song-card, .checks, .lesson__head { display: block; }
  .lesson__section > * + *, .exercise > * + *, .song-card > * + *, .lesson__head > * + * { margin-top: 12px; }
  .lesson__page > * + * { margin-top: 20px; }
  .lesson__band { background: none; color: var(--espresso); padding: 0; border-radius: 0; }
  .lesson__band .eyebrow { color: var(--cocoa); }
  .lesson__title { font-size: 2.3rem; }
  .lesson__meta { display: none; }
  .lcard, .exercise, .song-card, .plan-wrap, .checks, .tip, .ex-head { break-inside: avoid; }
  .lesson__chords { display: block; font-size: 0; }
  .lcard { display: inline-grid; width: calc(50% - 6px); vertical-align: top; padding: 10px 12px; gap: 6px; font-size: 11.5pt; margin-bottom: 10px; background: #fff; }
  .lcard:nth-child(odd) { margin-right: 12px; }
  .lcard-top b { font-size: 1.6rem; }
  .hands, .exercise .ex-goal { font-size: 10pt; }
  .song-card { background: #fff; }
  .h2--sm { font-size: 1.45rem; }
  .progression b { font-size: 2rem; }
  .progression div { padding-block: 8px 6px; }
  .exercises, .practice { break-before: page; }
}