/* Academia: portada y lecciones. Usa los colores y piezas de styles.css. */

/* Las páginas de la academia se leen bajando (el permutador, en cambio, cabe en la pantalla). */
@media (min-width: 900px) {
  body.academy { overflow: auto; }
  body.academy .app { height: auto; min-height: 100dvh; }
}

.ac-top-link {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 13.5px;
  font-weight: 600;
  text-decoration: none;
}
.ac-top-link:hover { border-color: var(--border-strong); }

/* Los textos de cada modo solo se ven en su modo */
.mode-physical [data-for="digital"],
.mode-digital [data-for="physical"],
.mode-physical .ac-practice-box { display: none !important; }

/* ---------- Lección ---------- */

.ac-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 440px);
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 22px var(--gutter) 72px;
}
.ac-article { max-width: 680px; min-width: 0; }

.ac-crumbs { display: flex; flex-wrap: wrap; gap: 6px; color: var(--text-3); font-size: 13px; }
.ac-crumbs a { color: var(--text-2); text-decoration: none; }
.ac-crumbs a:hover { color: var(--text); }
.ac-article h1 { margin: 10px 0 8px; font-size: clamp(28px, 4vw, 38px); font-weight: 800; letter-spacing: -.02em; line-height: 1.15; }
.ac-goal { margin: 0 0 20px; color: var(--text-2); font-size: 15.5px; }
.ac-goal b { color: var(--text); }

.ac-modes {
  display: inline-flex;
  gap: 2px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}
.ac-mode {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 16px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--text-2);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
}
.ac-mode svg { width: 15px; height: 15px; }
.ac-mode:hover { color: var(--text); }
.ac-mode[aria-checked="true"] { background: var(--raised-hover); color: var(--text); }
.ac-mode-note { margin: 10px 0 0; color: var(--text-3); font-size: 13px; }

.ac-content { margin-top: 26px; }
.ac-content p { margin: 0 0 14px; color: #c9c9c9; font-size: 15.5px; line-height: 1.7; }
.ac-content h2 { margin: 30px 0 10px; font-size: 20px; font-weight: 700; letter-spacing: -.01em; }
.ac-content b { color: var(--text); }
.ac-content code, .ac-practice code, .ac-hint-text code {
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--raised);
  color: var(--text);
  font-family: var(--mono);
  font-size: .88em;
  white-space: nowrap;
}
.ac-list { margin: 0 0 16px; padding: 0; list-style: none; counter-reset: step; display: grid; gap: 10px; }
.ac-list li { position: relative; padding-left: 36px; color: #c9c9c9; font-size: 15.5px; line-height: 1.65; counter-increment: step; }
.ac-list li::before {
  content: counter(step);
  position: absolute;
  top: 1px;
  left: 0;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  color: var(--text-2);
  font-size: 12px;
  font-weight: 700;
}
.ac-tip {
  padding: 12px 16px;
  border-left: 3px solid var(--warn);
  border-radius: 0 12px 12px 0;
  background: rgba(251, 191, 36, .06);
  font-size: 14.5px !important;
}

/* Casos: botones que lo enseñan en el cubo */
.ac-demos { display: grid; gap: 8px; margin: 6px 0 18px; }
.ac-demos.compact { display: flex; flex-wrap: wrap; gap: 6px; }
.ac-demo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px 10px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.ac-demos.compact .ac-demo { padding: 6px 12px 6px 6px; gap: 8px; border-radius: 999px; }
.ac-demo:hover { border-color: rgba(255, 255, 255, .3); background: var(--raised); }
.ac-demo.active { border-color: #fff; }
.ac-demo-play {
  display: grid;
  place-items: center;
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #fff;
  color: #111;
}
.ac-demos.compact .ac-demo-play { width: 24px; height: 24px; }
.ac-demo-play svg { width: 11px; height: 11px; margin-left: 2px; }
.ac-demo-text { display: grid; gap: 3px; min-width: 0; }
.ac-demo-title { font-size: 14px; font-weight: 600; }
.ac-demo code { color: var(--text-2); font-family: var(--mono); font-size: 13px; font-weight: 600; }
.ac-demos.compact .ac-demo code { color: var(--text); font-size: 14px; }

.ac-done {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 30px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
}
.ac-done div { display: grid; gap: 2px; }
.ac-done span { color: var(--text-2); font-size: 13.5px; }
.ac-done-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  height: 40px;
  padding: 0 18px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}
.ac-done-btn svg { width: 15px; height: 15px; }
.ac-done-btn.is-done { border-color: var(--ok); color: var(--ok); }
.ac-done-note { margin: 30px 0 0; color: var(--text-3); font-size: 13.5px; }

.ac-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 28px; }
.ac-pager a {
  display: grid;
  gap: 2px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}
.ac-pager a:hover { border-color: var(--border-strong); }
.ac-pager span { color: var(--text-3); font-size: 12.5px; font-weight: 500; }
.ac-next { text-align: right; }

/* ---------- Cubo de la lección ---------- */

.ac-cube { position: sticky; top: 16px; display: grid; gap: 12px; min-width: 0; }
.ac-stage { position: relative; height: min(400px, 48vh); }
.ac-stage .viewport { position: absolute; inset: 0; }
.ac-panel {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.ac-caption { margin: 0; font-size: 14px; font-weight: 600; }
.ac-caption.muted { color: var(--text-3); font-weight: 500; }
.ac-moves { display: flex; flex-wrap: wrap; gap: 4px; }
.ac-moves .mv { min-width: 30px; padding: 3px 6px; border-radius: 8px; font-size: 14px; }
.ac-panel .player { gap: 5px; }
.ac-panel .ctrl { width: 32px; height: 32px; }
.ac-panel .ctrl.play { min-width: 104px; height: 32px; font-size: 13px; }

.ac-practice-box:empty { display: none; }
.ac-practice { display: grid; gap: 10px; padding-top: 12px; border-top: 1px solid var(--border); }
.ac-practice-text { margin: 0; color: var(--text-2); font-size: 13.5px; }
.ac-practice-text b { color: var(--text); }
.ac-practice-text .ok { color: var(--ok); font-size: 15px; }
.ac-practice-text .muted { margin-left: 6px; color: var(--text-3); }
.ac-practice-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.ac-practice-btns .btn-primary { height: 36px; margin: 0; padding: 0 18px; font-size: 13.5px; display: inline-flex; align-items: center; text-decoration: none; }
.ac-practice-btns .tool-btn { height: 36px; }
.ac-hint { display: grid; gap: 8px; padding: 12px; border-radius: 12px; background: var(--raised); }
.ac-hint-text { margin: 0; color: var(--text-2); font-size: 13.5px; }
.ac-hint-alg { font-family: var(--mono); font-size: 15px; font-weight: 700; }
.ac-hint .tool-btn { justify-self: start; }
.ac-hint .tool-btn svg { width: 11px; height: 11px; }

/* ---------- Portada ---------- */

.ac-index { width: 100%; max-width: 1100px; margin: 0 auto; padding: 28px var(--gutter) 72px; }
.ac-hero { max-width: 720px; margin: 10px auto 34px; text-align: center; }
.ac-kicker { margin: 0; color: var(--text-3); font-size: 12px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.ac-hero h1 { margin: 10px 0 12px; font-size: clamp(32px, 5vw, 48px); font-weight: 800; letter-spacing: -.03em; line-height: 1.08; }
.ac-hero p { margin: 0; color: var(--text-2); font-size: 16.5px; line-height: 1.6; }
.ac-hero-modes { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.ac-hero-modes span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 600;
}
.ac-hero-modes svg { width: 14px; height: 14px; }

.ac-levels { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; align-items: start; }
.ac-level {
  display: grid;
  gap: 12px;
  padding: 22px;
  border: 1px solid var(--border-strong);
  border-radius: 22px;
  background: var(--surface);
}
.ac-level.locked { border-color: var(--border); opacity: .6; }
.ac-level-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.ac-level h2 { margin: 0; font-size: 22px; font-weight: 800; }
.ac-count { color: var(--text-3); font-size: 13px; }
.ac-level > p { margin: 0; color: var(--text-2); font-size: 14.5px; line-height: 1.6; }
.ac-soon { color: var(--text-3) !important; font-weight: 600; }
.ac-lessons { display: grid; gap: 4px; margin: 4px 0 0; padding: 0; list-style: none; }
.ac-lessons a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--text);
  font-size: 14.5px;
  text-decoration: none;
}
.ac-lessons a:hover { background: var(--raised); }
.ac-num {
  display: grid;
  place-items: center;
  flex: none;
  width: 24px;
  height: 24px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  color: var(--text-2);
  font-size: 11.5px;
  font-weight: 700;
}
.ac-check { margin-left: auto; color: var(--ok); opacity: 0; }
.ac-check svg { width: 15px; height: 15px; }
.ac-lessons a.done .ac-check { opacity: 1; }
.ac-lessons a.done .ac-num { border-color: var(--ok); color: var(--ok); }
.ac-start { display: inline-flex; align-items: center; justify-content: center; margin: 4px 0 0; text-decoration: none; }

/* ---------- Móvil / tablet ---------- */

@media (max-width: 899px) {
  .ac-layout { grid-template-columns: minmax(0, 1fr); gap: 18px; padding-top: 12px; }
  /* El cubo arriba y fijo mientras se lee la lección */
  .ac-cube {
    order: -1;
    position: sticky;
    top: 0;
    z-index: 5;
    gap: 8px;
    padding-bottom: 10px;
    background: var(--bg);
    box-shadow: 0 10px 14px -12px rgba(0, 0, 0, .6);
  }
  .ac-stage { height: min(300px, 32svh); }
  .ac-panel { gap: 8px; padding: 10px 12px; border-radius: 16px; }
  .ac-moves { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
  .ac-moves .mv { flex: none; }
  .ac-caption { overflow: hidden; font-size: 13px; text-overflow: ellipsis; white-space: nowrap; }
  .ac-practice { padding-top: 8px; gap: 8px; }
  .ac-levels { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
  .ac-top-link { height: 36px; padding: 0 12px; font-size: 13px; }
  .ac-modes { display: flex; }
  .ac-mode { flex: 1; justify-content: center; padding: 0 10px; }
  .ac-done { flex-direction: column; align-items: stretch; }
  .ac-pager { grid-template-columns: minmax(0, 1fr); }
  .ac-next { text-align: left; }
  .ac-panel .ctrl.play { min-width: 0; flex: 1; }
  .ac-panel .player-status { flex-basis: auto; }
}