/* ==========================================================
   doctorado.profealejoum.com — hoja de estilos
   Móvil primero · claro y oscuro · sensación de app
   ========================================================== */

:root {
  --brand:      #0d3b45;
  --brand-2:    #14606f;
  --acento:     #d98a3b;

  --fondo:      #f4f2ee;
  --superficie: #ffffff;
  --superficie-2:#faf8f5;
  --borde:      #e3ddd4;
  --texto:      #16232a;
  --texto-2:    #5f6f77;
  --sombra:     0 1px 2px rgba(13,59,69,.06), 0 8px 24px rgba(13,59,69,.06);
  --radio:      16px;
  --tabs-alto:  60px;
  --max:        720px;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --brand:      #6fd0d8;
    --brand-2:    #4fb3bf;
    --acento:     #e9a860;

    --fondo:      #0b1416;
    --superficie: #131e21;
    --superficie-2:#18262a;
    --borde:      #26383d;
    --texto:      #e8eef0;
    --texto-2:    #94a8ae;
    --sombra:     0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.3);

    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

/* imprescindible: nuestras clases declaran display, así que [hidden] necesita prioridad */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--fondo);
  color: var(--texto);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
  overscroll-behavior-y: none;
  -webkit-tap-highlight-color: transparent;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

/* ---------- estructura ---------------------------------- */
.app {
  min-height: 100dvh;
  padding-bottom: calc(var(--tabs-alto) + env(safe-area-inset-bottom));
}

/* con el reproductor abierto, el contenido necesita más aire abajo */
body.con-player .app {
  padding-bottom: calc(var(--tabs-alto) + 96px + env(safe-area-inset-bottom));
}

.vista {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 16px 32px;
  animation: entra .22s ease;
}

@keyframes entra {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  .vista { animation: none; }
}

/* ---------- barra superior ------------------------------ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: calc(env(safe-area-inset-top) + 10px) 16px 10px;
  background: color-mix(in srgb, var(--fondo) 85%, transparent);
  backdrop-filter: saturate(150%) blur(12px);
  border-bottom: 1px solid var(--borde);
}

.topbar__marca { display: flex; align-items: center; gap: 9px; }

.topbar__logo {
  display: grid;
  place-items: center;
  width: 30px; height: 30px;
  border-radius: 9px;
  background: var(--brand);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .5px;
}

@media (prefers-color-scheme: dark) {
  .topbar__logo { color: #0b1416; }
}

.topbar__txt { font-weight: 650; letter-spacing: -.2px; }

.topbar__perfil {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid var(--borde);
  background: var(--superficie);
  color: var(--texto-2);
  font-weight: 700;
  line-height: 1;
}

/* ---------- portada ------------------------------------- */
.hero { padding: 26px 0 22px; }

.hero__saludo {
  margin: 0 0 4px;
  color: var(--texto-2);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .1em;
}

.hero__titulo {
  margin: 0;
  font-size: clamp(28px, 8vw, 40px);
  line-height: 1.1;
  letter-spacing: -.03em;
  font-weight: 700;
}

.hero__sub { margin: 8px 0 0; color: var(--texto-2); }

.hero__stats {
  display: flex;
  gap: 18px;
  margin-top: 16px;
  font-size: 13px;
  color: var(--texto-2);
}
.hero__stats strong { color: var(--brand-2); font-size: 16px; }

/* ---------- secciones ----------------------------------- */
.seccion { margin-bottom: 30px; }

.seccion__cab {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.seccion__cab h2 {
  margin: 0;
  font-size: 19px;
  letter-spacing: -.02em;
}

.seccion__desc {
  margin: 0 0 14px;
  color: var(--texto-2);
  font-size: 14px;
}

.chip {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--brand-2) 14%, transparent);
  color: var(--brand-2);
  font-size: 12px;
  font-weight: 600;
}
.chip--claro { background: rgba(255,255,255,.18); color: #fff; }

/* ---------- tarjetas de curso --------------------------- */
.tarjetas { display: grid; gap: 10px; }

.curso {
  position: relative;
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 15px 14px;
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  background: var(--superficie);
  box-shadow: var(--sombra);
  overflow: hidden;
  transition: transform .12s ease;
}
.curso::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--c, var(--brand));
}
.curso:active { transform: scale(.985); }

.curso__icono {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 42px; height: 42px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--c, var(--brand)) 12%, transparent);
  font-size: 20px;
}

.curso__cuerpo { flex: 1; min-width: 0; }
.curso__nombre  { display: block; font-weight: 620; letter-spacing: -.01em; }
.curso__docente { display: block; margin-top: 2px; font-size: 13px; color: var(--texto-2); }
.curso__meta    { display: block; margin-top: 5px; font-size: 12px; color: var(--texto-2); }
.curso__flecha  { color: var(--texto-2); font-size: 22px; line-height: 1; }

/* ---------- cabecera de curso --------------------------- */
.cab-curso {
  margin: 0 -16px 18px;
  padding: 18px 16px 22px;
  background: linear-gradient(150deg, var(--c, var(--brand)), color-mix(in srgb, var(--c, var(--brand)) 62%, #000));
  color: #fff;
}
.cab-curso h1 {
  margin: 10px 0 0;
  font-size: 23px;
  line-height: 1.22;
  letter-spacing: -.02em;
}
.cab-curso__icono { font-size: 28px; }
.cab-curso__docente { margin: 7px 0 12px; font-size: 13px; opacity: .85; }

.volver {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 14px;
  opacity: .85;
}

.cab-simple { padding: 24px 0 14px; }
.cab-simple h1 { margin: 0; font-size: 26px; letter-spacing: -.025em; }
.cab-simple p  { margin: 6px 0 0; color: var(--texto-2); font-size: 14px; }

.curso__intro {
  margin: 0 0 18px;
  color: var(--texto-2);
  font-size: 14px;
}

/* ---------- lista de recursos --------------------------- */
.recursos { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }

.recurso {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px;
  border: 1px solid var(--borde);
  border-radius: 14px;
  background: var(--superficie);
  box-shadow: var(--sombra);
}
.recurso--audio { cursor: pointer; }
.recurso--audio:active { background: var(--superficie-2); }
.recurso.is-sonando { border-color: var(--brand-2); }

.recurso__icono {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--superficie-2);
  font-size: 17px;
}

.recurso__cuerpo { flex: 1; min-width: 0; }
.recurso__titulo { margin: 0; font-weight: 600; line-height: 1.35; letter-spacing: -.01em; }
.recurso__sub    { margin: 2px 0 0; font-size: 13px; color: var(--texto-2); }

.recurso__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 7px 0 0;
  font-size: 12px;
  color: var(--texto-2);
}

.tag {
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--superficie-2);
  border: 1px solid var(--borde);
  font-size: 11px;
  font-weight: 600;
}
.tag--ok {
  background: color-mix(in srgb, #2e9e6b 16%, transparent);
  border-color: transparent;
  color: #2e9e6b;
}

.barrita {
  display: block;
  height: 3px;
  margin-top: 8px;
  border-radius: 3px;
  background: var(--borde);
  overflow: hidden;
}
.barrita i { display: block; height: 100%; background: var(--brand-2); }

.btn-play {
  flex: 0 0 auto;
  width: 38px; height: 38px;
  border-radius: 50%;
  border: none;
  background: var(--brand);
  color: #fff;
  font-size: 13px;
}
@media (prefers-color-scheme: dark) {
  .btn-play { color: #0b1416; }
}

.btn-abrir {
  flex: 0 0 auto;
  align-self: center;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--borde);
  background: var(--superficie-2);
  font-size: 13px;
  font-weight: 600;
}

/* notas plegables */
.notas { margin-top: 9px; }
.notas summary {
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-2);
  list-style: none;
}
.notas summary::-webkit-details-marker { display: none; }
.notas summary::before { content: "▸ "; }
.notas[open] summary::before { content: "▾ "; }

.notas__cuerpo {
  margin-top: 8px;
  padding: 11px 13px;
  border-radius: 11px;
  background: var(--superficie-2);
  font-size: 14px;
  color: var(--texto-2);
}
.notas__cuerpo p:first-child { margin-top: 0; }
.notas__cuerpo p:last-child  { margin-bottom: 0; }
.notas__cuerpo ul { margin: 8px 0 0; padding-left: 20px; }
.notas__cuerpo strong { color: var(--texto); }

/* ---------- métricas ------------------------------------ */
.metricas {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 9px;
  margin: 16px 0 20px;
}
.metrica {
  padding: 14px 10px;
  border: 1px solid var(--borde);
  border-radius: 14px;
  background: var(--superficie);
  text-align: center;
  box-shadow: var(--sombra);
}
.metrica strong { display: block; font-size: 22px; color: var(--brand-2); }
.metrica span   { font-size: 12px; color: var(--texto-2); }

/* ---------- reproductor persistente --------------------- */
.player {
  position: fixed;
  left: 0; right: 0;
  bottom: calc(var(--tabs-alto) + env(safe-area-inset-bottom));
  z-index: 40;
  max-width: var(--max);
  margin: 0 auto;
  padding: 9px 14px 10px;
  background: color-mix(in srgb, var(--superficie) 92%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  border-top: 1px solid var(--borde);
  animation: sube .2s ease;
}
@keyframes sube { from { transform: translateY(100%); } to { transform: none; } }

.player__barra {
  height: 4px;
  margin: 0 0 9px;
  border-radius: 3px;
  background: var(--borde);
  cursor: pointer;
  overflow: hidden;
}
.player__barra i {
  display: block;
  height: 100%;
  width: 0;
  background: var(--brand-2);
}

.player__fila { display: flex; align-items: center; gap: 10px; }
.player__info { flex: 1; min-width: 0; }

.player__titulo {
  margin: 0;
  font-size: 13.5px;
  font-weight: 620;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.player__curso {
  margin: 1px 0 0;
  font-size: 11.5px;
  color: var(--texto-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player__ctrl { display: flex; align-items: center; gap: 4px; }
.player__ctrl button {
  min-width: 34px;
  height: 32px;
  padding: 0 6px;
  border: none;
  border-radius: 9px;
  background: transparent;
  color: var(--texto-2);
  font-size: 11.5px;
  font-weight: 700;
}
.player__ctrl button:active { background: var(--superficie-2); }

.player__play {
  width: 38px; height: 38px;
  border-radius: 50% !important;
  background: var(--brand) !important;
  color: #fff !important;
  font-size: 14px !important;
}
@media (prefers-color-scheme: dark) {
  .player__play { color: #0b1416 !important; }
}

.player__vel { color: var(--brand-2) !important; }
.player__x   { font-size: 13px !important; }

.player__tiempo {
  margin: 5px 0 0;
  font-size: 11px;
  color: var(--texto-2);
  font-variant-numeric: tabular-nums;
}

/* ---------- pestañas inferiores ------------------------- */
.tabs {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 50;
  display: flex;
  max-width: var(--max);
  margin: 0 auto;
  height: calc(var(--tabs-alto) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: color-mix(in srgb, var(--superficie) 92%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  border-top: 1px solid var(--borde);
}

.tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 10.5px;
  font-weight: 600;
  color: var(--texto-2);
}
.tab span { font-size: 19px; line-height: 1; filter: grayscale(1) opacity(.65); }
.tab.is-on { color: var(--brand-2); }
.tab.is-on span { filter: none; }

/* ---------- modal --------------------------------------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: grid;
  place-items: end center;
  background: rgba(10,20,22,.5);
  backdrop-filter: blur(3px);
}

.modal__caja {
  position: relative;
  width: 100%;
  max-width: var(--max);
  padding: 26px 20px calc(24px + env(safe-area-inset-bottom));
  border-radius: 22px 22px 0 0;
  background: var(--superficie);
  animation: sube .25s ease;
}
@media (min-width: 640px) {
  .modal { place-items: center; }
  .modal__caja { border-radius: 20px; margin: 0 20px; }
}

.modal__caja h2 { margin: 0 0 8px; font-size: 21px; letter-spacing: -.02em; }
.modal__texto   { margin: 0 0 18px; color: var(--texto-2); font-size: 14px; }

.modal__x {
  position: absolute;
  top: 14px; right: 14px;
  width: 30px; height: 30px;
  border: none;
  border-radius: 50%;
  background: var(--superficie-2);
  color: var(--texto-2);
}

.modal label {
  display: block;
  margin-bottom: 13px;
  font-size: 13px;
  font-weight: 600;
  color: var(--texto-2);
}
.modal label small { font-weight: 400; }

.modal input {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding: 12px 13px;
  border: 1px solid var(--borde);
  border-radius: 12px;
  background: var(--superficie-2);
  color: var(--texto);
  font: inherit;
}
.modal input:focus {
  outline: none;
  border-color: var(--brand-2);
}

/* ---------- botones y varios ---------------------------- */
.btn {
  padding: 12px 18px;
  border: none;
  border-radius: 12px;
  background: var(--brand);
  color: #fff;
  font-weight: 650;
}
@media (prefers-color-scheme: dark) { .btn { color: #0b1416; } }

.btn--full  { display: block; width: 100%; margin-top: 6px; }
.btn--texto {
  display: block;
  width: 100%;
  margin-top: 8px;
  background: transparent;
  color: var(--texto-2);
  font-weight: 500;
}

.vacio {
  padding: 26px 16px;
  border: 1px dashed var(--borde);
  border-radius: var(--radio);
  color: var(--texto-2);
  text-align: center;
  font-size: 14px;
}

.aviso {
  position: fixed;
  left: 50%;
  bottom: calc(var(--tabs-alto) + env(safe-area-inset-bottom) + 76px);
  transform: translateX(-50%);
  z-index: 80;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--sombra);
  animation: entra .2s ease;
}
@media (prefers-color-scheme: dark) { .aviso { color: #0b1416; } }