/* Curso de inglés — hoja de estilos compartida. Todas las lecciones y referencias la enlazan. */
:root {
  --bg: #fffdf8;
  --ink: #1d1d1b;
  --muted: #6b6a66;
  --rule: #e4e0d6;
  --accent: #0b5cad;        /* azul británico sobrio */
  --accent-soft: #e8f0fa;
  --ok: #1e7f4f;
  --ok-soft: #e4f4ea;
  --bad: #b3261e;
  --bad-soft: #fbe9e7;
  --warn-soft: #fff4d6;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "SF Mono", Menlo, Consolas, monospace;
  --measure: 38rem;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a; --ink: #ebe8e1; --muted: #a09d96; --rule: #2e2f34;
    --accent: #7fb2ec; --accent-soft: #1b2a3d;
    --ok: #6fcf97; --ok-soft: #173224; --bad: #f28b82; --bad-soft: #3a1f1d; --warn-soft: #3a3320;
  }
}
* { box-sizing: border-box; }
html { font-size: 112.5%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--serif); line-height: 1.55;
  padding: 3rem 1.25rem 6rem;
}
main, article { max-width: var(--measure); margin: 0 auto; }
h1, h2, h3 { font-weight: 400; line-height: 1.15; letter-spacing: -0.01em; }
h1 { font-size: 2.4rem; margin: 0 0 .25rem; }
h2 { font-size: 1.55rem; margin: 3rem 0 .75rem; padding-top: 1rem; border-top: 1px solid var(--rule); }
h3 { font-size: 1.15rem; margin: 1.75rem 0 .5rem; font-style: italic; }
p { margin: 0 0 1rem; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
small, .muted { color: var(--muted); }
.kicker { font-family: var(--sans); font-size: .8rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin-bottom: .5rem; }
.subtitle { font-size: 1.2rem; color: var(--muted); font-style: italic; margin-bottom: 2rem; }
.meta { font-family: var(--sans); font-size: .85rem; color: var(--muted); display: flex; gap: 1.25rem; flex-wrap: wrap; margin-bottom: 2.5rem; }

/* Notas al margen, estilo Tufte. En pantallas estrechas se vuelven bloques. */
.sidenote { font-family: var(--sans); font-size: .82rem; line-height: 1.45; color: var(--muted);
  border-left: 2px solid var(--rule); padding-left: .75rem; margin: .5rem 0 1.25rem; }
@media (min-width: 1100px) {
  body { padding-left: 4rem; }
  main, article { position: relative; margin-left: max(1rem, calc(50% - 24rem)); }
  .sidenote { position: absolute; right: -17rem; width: 15rem; margin-top: -1.2rem; border-left: none; padding-left: 0; }
}

/* Frases en inglés */
.en { font-family: var(--sans); font-weight: 600; color: var(--ink); }
.ipa { font-family: var(--sans); color: var(--muted); font-size: .9em; }
.es { color: var(--muted); font-style: italic; }

/* Tabla de frases */
table.phrases { width: 100%; border-collapse: collapse; margin: 1rem 0 1.5rem; font-size: .98rem; }
table.phrases th { text-align: left; font-family: var(--sans); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 500; padding: .4rem .5rem; border-bottom: 1px solid var(--rule); }
table.phrases td { padding: .55rem .5rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
table.phrases td:first-child { white-space: nowrap; }

/* Cajas */
.box { border: 1px solid var(--rule); border-radius: 6px; padding: 1rem 1.25rem; margin: 1.25rem 0; }
.box.tip { background: var(--accent-soft); border-color: transparent; }
.box.warn { background: var(--warn-soft); border-color: transparent; }
.box.task { background: var(--ok-soft); border-color: transparent; }
.box h3 { margin-top: 0; }
.box > :last-child { margin-bottom: 0; }

/* Botón hablar / genérico */
button, .btn {
  font-family: var(--sans); font-size: .9rem; cursor: pointer;
  border: 1px solid var(--rule); background: var(--bg); color: var(--ink);
  border-radius: 999px; padding: .35rem .9rem; line-height: 1.2;
}
button:hover { border-color: var(--accent); color: var(--accent); }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.primary:hover { filter: brightness(1.08); color: #fff; }
button.say { padding: .2rem .55rem; font-size: .8rem; vertical-align: middle; margin-left: .35rem; }
button.say::before { content: "▶ "; font-size: .7em; }
button:disabled { opacity: .5; cursor: default; }

/* Quiz */
.quiz .q { margin: 1.5rem 0; padding: 1rem 1.25rem; border: 1px solid var(--rule); border-radius: 6px; }
.quiz .q-text { font-weight: 500; margin-bottom: .75rem; }
.quiz .opts { display: grid; gap: .5rem; }
.quiz .opt { text-align: left; border-radius: 6px; padding: .6rem .9rem; font-family: var(--sans); font-size: .95rem; }
.quiz .opt.correct { background: var(--ok-soft); border-color: var(--ok); color: var(--ink); }
.quiz .opt.wrong { background: var(--bad-soft); border-color: var(--bad); color: var(--ink); }
.quiz .explain { font-family: var(--sans); font-size: .85rem; color: var(--muted); margin-top: .75rem; display: none; }
.quiz .q.done .explain { display: block; }
.quiz .score { font-family: var(--sans); margin-top: 1rem; padding: .75rem 1rem; border-radius: 6px; background: var(--accent-soft); display: none; }

/* Flashcards */
.fc { border: 1px solid var(--rule); border-radius: 8px; padding: 1.5rem; text-align: center; margin: 1rem 0; }
.fc .face { min-height: 5rem; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; }
.fc .face.back { color: var(--accent); font-family: var(--sans); font-weight: 600; }
.fc .controls { display: flex; gap: .5rem; justify-content: center; flex-wrap: wrap; margin-top: 1rem; }
.fc .progress { font-family: var(--sans); font-size: .8rem; color: var(--muted); margin-top: .75rem; }

/* Formulario de guion */
.builder label { display: block; font-family: var(--sans); font-size: .85rem; color: var(--muted); margin-top: .75rem; }
.builder input { font: inherit; font-family: var(--sans); width: 100%; padding: .45rem .6rem; border: 1px solid var(--rule); border-radius: 4px; background: var(--bg); color: var(--ink); }
.script { font-family: var(--sans); font-size: 1.15rem; line-height: 1.7; padding: 1rem 1.25rem; background: var(--accent-soft); border-radius: 6px; margin-top: 1rem; }

/* Checklist */
ul.check { list-style: none; padding: 0; }
ul.check li { padding-left: 1.75rem; position: relative; margin: .4rem 0; }
ul.check li::before { content: "☐"; position: absolute; left: 0; color: var(--muted); }

footer { margin-top: 4rem; padding-top: 1rem; border-top: 1px solid var(--rule); font-family: var(--sans); font-size: .85rem; color: var(--muted); }
nav.lessons { font-family: var(--sans); font-size: .85rem; display: flex; justify-content: space-between; gap: 1rem; margin-top: 1rem; }

@media print {
  body { padding: 0; background: #fff; color: #000; font-size: 11pt; }
  button, .quiz, .fc, nav.lessons { display: none !important; }
  .sidenote { position: static; width: auto; }
  a { color: #000; text-decoration: none; }
  h2 { break-after: avoid; }
}