:root {
  --paper: #f7f2e9;
  --card: #fffdf8;
  --ink: #1d1b2f;
  --muted: #615c70;
  --line: #e3dccd;
  --blue: #23338c;
  --red: #c4362f;
  --green: #2f7a4f;
  --amber: #b07a12;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.65 var(--sans); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

.masthead { padding: 72px 0 48px; border-bottom: 1px solid var(--line); background:
  radial-gradient(circle at 90% 10%, rgba(35,51,140,.10), transparent 40%),
  radial-gradient(circle at 10% 100%, rgba(196,54,47,.08), transparent 40%); }
.kicker { font: italic 400 1.1rem var(--serif); color: var(--red); margin: 0 0 8px; }
h1 { font: 800 clamp(2.4rem, 6vw, 4.4rem)/1.05 var(--serif); margin: 0 0 20px; letter-spacing: -.02em; }
h1 em { font-weight: 400; color: var(--blue); }
.lede { max-width: 680px; font-size: 1.15rem; color: var(--muted); margin: 0; }
.say-demo { border-bottom: 2px dotted var(--blue); color: var(--blue); }
.voice-bar { display: flex; gap: 20px; align-items: center; margin-top: 24px; font-size: .9rem; color: var(--muted); flex-wrap: wrap; }
.voice-bar label { display: flex; gap: 10px; align-items: center; }
.voice-bar input { accent-color: var(--blue); }
.voice-status { font-style: italic; }

.layout { display: grid; grid-template-columns: 220px 1fr; gap: 56px; padding-top: 48px; padding-bottom: 64px; }
.toc { position: sticky; top: 24px; align-self: start; font-size: .92rem; }
.toc-title { font: 600 .75rem var(--sans); text-transform: uppercase; letter-spacing: .12em; color: var(--muted); }
.toc ol { list-style: none; padding: 0; margin: 0; counter-reset: t; }
.toc li { counter-increment: t; }
.toc a { display: block; padding: 6px 10px; border-left: 2px solid var(--line); color: var(--muted); text-decoration: none; }
.toc a::before { content: counter(t, decimal-leading-zero) "  "; font-variant-numeric: tabular-nums; opacity: .5; }
.toc a:hover, .toc a.active { color: var(--blue); border-left-color: var(--blue); }

main { min-width: 0; }
section { padding: 8px 0 48px; margin-bottom: 24px; border-bottom: 1px solid var(--line); scroll-margin-top: 24px; }
section:last-child { border-bottom: 0; }
.num { font: 600 .8rem var(--sans); letter-spacing: .1em; color: var(--red); }
h2 { font: 600 2.1rem/1.15 var(--serif); margin: 4px 0 16px; }
h3 { font: 600 1.15rem var(--serif); margin: 0 0 6px; }
h3.sub { margin-top: 28px; }

.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 24px 0; }
.cards.three { grid-template-columns: repeat(3, 1fr); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card p { margin: 0 0 8px; color: var(--muted); font-size: .95rem; }
.card .ex { margin: 12px 0 0; color: var(--ink); }
.card h3.ipa { font-size: 1.8rem; color: var(--blue); }

.fr { display: inline-block; font-family: var(--serif); font-weight: 600; color: var(--blue); cursor: pointer;
  border-bottom: 2px dotted rgba(35,51,140,.35); padding: 0 2px; margin: 0 2px; border-radius: 3px; transition: background .15s; }
.fr:hover, .fr:focus-visible { background: rgba(35,51,140,.08); outline: none; }
.fr.playing { background: var(--blue); color: #fff; border-bottom-color: transparent; }
.ipa { font-family: "Doulos SIL", "Charis SIL", "Segoe UI", sans-serif; color: var(--red); white-space: nowrap; }

.sound-table { width: 100%; border-collapse: collapse; margin: 20px 0; background: var(--card); border-radius: 14px; overflow: hidden; border: 1px solid var(--line); font-size: .95rem; }
.sound-table th { text-align: left; font: 600 .75rem var(--sans); text-transform: uppercase; letter-spacing: .08em; color: var(--muted); padding: 12px 14px; background: #f1ebdf; }
.sound-table td { padding: 12px 14px; border-top: 1px solid var(--line); vertical-align: top; }
.sound-table td:first-child { font-weight: 600; white-space: nowrap; }

.tip { background: #eef0fa; border-left: 4px solid var(--blue); padding: 14px 18px; border-radius: 0 10px 10px 0; margin: 20px 0 0; font-size: .95rem; }
.pairs { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.pairs li { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; }
.arrow { color: var(--red); margin: 0 6px; }

.rules { display: grid; gap: 16px; margin-top: 28px; }
.rule { background: var(--card); border: 1px solid var(--line); border-top: 4px solid; border-radius: 14px; padding: 20px 22px; }
.rule ul { margin: 8px 0 0; padding-left: 20px; }
.rule li { margin-bottom: 8px; }
.rule.must { border-top-color: var(--green); } .rule.must h3 { color: var(--green); }
.rule.never { border-top-color: var(--red); } .rule.never h3 { color: var(--red); }
.rule.maybe { border-top-color: var(--amber); } .rule.maybe h3 { color: var(--amber); }
.note { color: var(--muted); font-size: .9rem; margin: 8px 0 0; }

.quiz { display: grid; gap: 12px; margin-top: 20px; }
.q { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; display: grid; grid-template-columns: 1fr auto; gap: 8px 16px; align-items: center; }
.q .fr { font-size: 1.25rem; justify-self: start; }
.q .choices { display: flex; gap: 8px; flex-wrap: wrap; }
.q .feedback { grid-column: 1 / -1; font-size: .92rem; margin: 0; }
.q.right { border-color: var(--green); } .q.right .feedback { color: var(--green); }
.q.wrong { border-color: var(--red); } .q.wrong .feedback { color: var(--red); }
.btn { font: 500 .9rem var(--sans); padding: 8px 16px; border-radius: 999px; border: 1.5px solid var(--blue); background: var(--blue); color: #fff; cursor: pointer; }
.btn.ghost { background: transparent; color: var(--blue); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.picked { outline: 3px solid rgba(35,51,140,.25); }
.quiz-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 20px; }
.score { font: 600 1.2rem var(--serif); margin: 0; }

.foot { border-top: 1px solid var(--line); padding: 24px 0; color: var(--muted); font-size: .9rem; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; gap: 24px; }
  .toc { position: static; }
  .toc ol { display: flex; flex-wrap: wrap; gap: 4px; }
  .toc a { border-left: 0; border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; }
  .cards, .cards.three, .pairs { grid-template-columns: 1fr; }
  .sound-table { display: block; overflow-x: auto; }
  .q { grid-template-columns: 1fr; }
}