:root {
  color-scheme: light dark;
  --paper: #f5f3ec;
  --surface: #eeeee4;
  --ink: #303b33;
  --muted: #626b60;
  --line: #d9dbd1;
  --accent: #3d5747;
  --on-accent: #ffffff;
  --hover: #e6e8dd;
  --focus: #936038;
  --video: #171b18;
  --serif: Georgia, "Times New Roman", serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1b211d;
    --surface: #252e27;
    --ink: #e5e6d9;
    --muted: #b1b8a9;
    --line: #3c473d;
    --accent: #b5c9ac;
    --on-accent: #1d2b21;
    --hover: #303b31;
    --focus: #e3b98d;
    --video: #101510;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
button, select, input { font: inherit; }
button, a, input, select, summary { -webkit-tap-highlight-color: transparent; }
button, select, summary, input[type="checkbox"] { cursor: pointer; }
a { color: var(--accent); text-underline-offset: .22em; }
button { color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 5px; }
button:disabled { cursor: default; opacity: .45; }
.page { max-width: 792px; margin: 0 auto; padding: 68px 32px 34px; }
.masthead { margin-bottom: 36px; }
.eyebrow { margin: 0; font-size: .75rem; letter-spacing: .13em; text-transform: uppercase; font-weight: 550; color: var(--muted); }
h1, h2, p { margin-top: 0; }
h1 { margin: 10px 0 9px; font: 400 clamp(2.6rem, 6vw, 3.5rem)/1.1 var(--serif); letter-spacing: -.045em; }
.intro { margin: 0; color: var(--muted); font-family: var(--serif); font-size: 1.2rem; }
.practice { padding: 27px 30px 30px; border: 1px solid var(--line); border-radius: 5px; background: var(--surface); }
.practice-top, .section-heading, .player-tools { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.duration { white-space: nowrap; color: var(--muted); font-size: .875rem; font-variant-numeric: tabular-nums; }
.practice h2 { margin: 17px 0 6px; font: 400 2rem/1.2 var(--serif); letter-spacing: -.02em; }
.practice > p { margin-bottom: 23px; color: var(--muted); }
.primary { display: inline-flex; align-items: center; justify-content: center; gap: 13px; min-height: 46px; padding: 10px 20px; border: 1px solid var(--accent); border-radius: 4px; background: var(--accent); color: var(--on-accent); font-size: .9375rem; font-weight: 550; }
.play-symbol { font-size: .75rem; }
.video { aspect-ratio: 16 / 9; width: 100%; background: var(--video); border-radius: 3px; overflow: hidden; }
.video iframe { display: block; width: 100%; height: 100%; border: 0; }
.player-tools { margin-top: 12px; font-size: .875rem; flex-wrap: wrap; }
#player-status { margin-bottom: 0; }
.text-button { padding: 8px 0; min-height: 44px; border: 0; background: none; color: var(--accent); text-decoration: underline; text-underline-offset: .22em; font-size: .875rem; }
.course { margin-top: 34px; margin-bottom: 33px; }
.section-heading { align-items: baseline; margin-bottom: 11px; flex-wrap: wrap; gap: 4px 16px; }
.section-heading h2 { margin: 0; font-family: var(--serif); font-size: 1.2rem; font-weight: 400; }
.muted { color: var(--muted); }
#progress { font-size: .8125rem; white-space: nowrap; }
.sessions { margin: 0; padding: 0; list-style: none; }
.session { display: grid; grid-template-columns: minmax(0, 1fr) 44px; align-items: center; border-bottom: 1px solid var(--line); }
.session-play { width: 100%; text-align: left; display: grid; grid-template-columns: 25px minmax(0, 1fr) auto; align-items: center; gap: 14px; min-height: 64px; border: 0; border-radius: 3px; background: none; padding: 10px 6px 10px 0; }
.session-play[aria-current="true"] .session-title { color: var(--accent); }
.session-number { font: 400 .875rem var(--serif); color: var(--muted); }
.session-title { font-size: .9375rem; font-weight: 450; }
.session.done .session-number { color: var(--accent); }
.check-label { display: grid; place-items: center; width: 44px; min-height: 48px; cursor: pointer; }
input[type="checkbox"] { width: 19px; height: 19px; accent-color: var(--accent); }
.course-note { margin: 13px 0 0; color: var(--muted); font-size: .8125rem; }
.secondary { border-top: 1px solid var(--line); }
.secondary:last-of-type { border-bottom: 1px solid var(--line); }
summary { position: relative; min-height: 62px; padding: 18px 24px 18px 0; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2px 15px; list-style: none; font-size: .9375rem; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 0; top: 17px; color: var(--muted); }
details[open] > summary::after { content: "−"; }
.summary-hint { color: var(--muted); font-size: .8125rem; align-self: center; }
.disclosure-body { padding: 4px 0 23px; }
.exploration-note { max-width: 570px; color: var(--muted); }
.resources { list-style: none; padding: 0; margin: 24px 0 0; }
.resources li { margin-bottom: 21px; }
.resources a { font-size: .9375rem; }
.resources p { margin: 3px 0 0; color: var(--muted); font-size: .875rem; }
.fold { margin-top: 0; }
.timer-setup, .timer-buttons { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
select { min-height: 44px; padding: 7px 25px 7px 12px; background: var(--surface); color: var(--ink); border: 1px solid var(--line); border-radius: 4px; }
.bell-label { display: inline-flex; align-items: center; gap: 7px; margin-left: auto; min-height: 44px; font-size: .875rem; }
.timer-clock { margin: 18px 0; font: 400 3.2rem/1.2 var(--serif); font-variant-numeric: tabular-nums; }
.small { font-size: .8125rem; }
.disclosure-body > .small { margin: 18px 0 0; }
footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 7px 18px; margin-top: 28px; font-size: .8125rem; color: var(--muted); }
footer p { margin: 0; }
#storage-status { flex-basis: 100%; }
@media (hover: hover) {
  .primary:hover { filter: brightness(.92); }
  .session-play:hover { background: var(--hover); }
}
@media (max-width: 520px) {
  .page { padding: 37px 22px 28px; }
  .masthead { margin-bottom: 28px; }
  .practice { padding: 22px 20px; }
  .practice h2 { font-size: 1.85rem; }
  .session-play { grid-template-columns: 20px minmax(0, 1fr) auto; gap: 8px; }
  .session .duration { font-size: .8125rem; }
  .course { margin-top: 29px; }
}
@media (prefers-reduced-motion: no-preference) {
  button { transition: background-color .12s ease; }
}