/* =======================================================
   style
   -------------------------------------------------------
   Secciones:
   1) Reset & Variables
   2) Base documento
   3) Cabecera y Objetivo
   4) Navegación (botones + menú)
   5) Layout principal (container, columnas, tarjetas)
   6) Componentes (temario, descripción, calendario, links)
   7) Listas temario + interacción
   8) Footer fijo
   9) Responsivo
   ======================================================= */

/* 1) Reset & Variables */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --footer-h: 56px;              /* altura base del footer (se ajusta en breakpoints) */
  --card-pad: 1rem;
  --radius: 12px;
  --border: 1px solid rgba(0,0,0,.08);
  --navy-dark: #001f3f;
  --navy-mid:  #002b5c;
  --text:      #102a43;
  --bg:        #f9f9f9;
  --card-border:#e0e0e0;
}

/* 2) Base documento */
html, body {
  height: 100%;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background-color: var(--bg);
  color: var(--text);
}
.has-fixed-footer { min-height: 100%; } /* sin padding: el hueco lo reserva .container */

/* 3) Cabecera y Objetivo */
.header {
  text-align: center;
  padding: 2rem 1rem;
  background-color: var(--navy-dark);
  color: #fff;
}
.header h1 { font-size: 2rem; margin-bottom: .5rem; }
.header h2 { font-size: 1.2rem; margin-bottom: 1rem; }
.header .intro { font-size: 1rem; line-height: 1.4; max-width: 700px; margin: 0 auto; }

.objective{
  max-width: 1200px;
  margin: 1.25rem auto 0;
  padding: calc(var(--card-pad) + .25rem);
  background: #fff;
  border: var(--border);
  border-radius: var(--radius);
}
.objective h3{
  margin-top: 0;
  font-size: 1.1rem;
  color: var(--navy-mid);
}
.objective p{
  line-height: 1.5;
  margin: .5rem 0 0;
}
.objective .note{
  opacity: .9;
  font-size: .95rem;
}

/* 4) Navegación */
.nav-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  padding: 1.5rem;
  background-color: var(--navy-dark);
}
.btn {
  display: inline-block;
  padding: .75rem 1.5rem;
  background-color: var(--navy-dark);
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 700;
  transition: background .25s ease;
}
.btn:hover { background-color: #003366; }

.menu {
  display: flex;
  justify-content: center;
  gap: 1rem;
  background-color: var(--navy-mid);
  padding: 1rem;
}
.menu a {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: .25rem .5rem;
  border-radius: 6px;
}
.menu a:hover,
.menu a.active { background: rgba(255,255,255,.12); }

/* 5) Layout principal */
.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
  /* reserva hueco bajo el footer fijo */
  padding-bottom: calc(var(--footer-h) + 24px + env(safe-area-inset-bottom));
}

.two-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.card {
  background-color: #fff;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 1rem;
}
.card h3 { margin-top: 0; }

.two-sections {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2rem;
}
.section {
  background-color: #fff;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 1rem;
}

/* 6) Componentes */
.box-temario {
  border: var(--border);
  border-radius: var(--radius);
  padding: calc(var(--card-pad) + .25rem);
  background: #fff;
}

.desc-box{
  border: var(--border);
  border-radius: var(--radius);
  background: #fff;
  padding: calc(var(--card-pad) + .25rem);
  min-height: 220px;
}

.calendar {
  width: 100%;
  border-collapse: collapse;
}
.calendar th, .calendar td {
  padding: .65rem .75rem;
  border-bottom: 1px solid var(--card-border);
  text-align: left;
}
.calendar thead th {
  background: var(--navy-mid);
  color: #fff;
  font-weight: 700;
}
.calendar tbody tr:hover { background: rgba(0,0,0,.03); }
.calendar td:first-child { width: 92px; font-weight: 600; }

.reading-links{
  margin-top: .75rem;
  padding-top: .5rem;
  border-top: 1px dashed var(--card-border);
}
.reading-links p{ margin: .25rem 0; font-weight: 600; }
.reading-links a{ color: var(--navy-mid); text-decoration: underline; }
.reading-links a:hover{ text-decoration: none; }

/* 7) Listas temario + interacción */
.syllabus { padding-bottom: 12px; }
.syllabus > li { margin-bottom: .75rem; }
.syllabus ol { margin-top: .4rem; margin-left: 1.1rem; }
.syllabus li { line-height: 1.45; }

.syllabus [data-key] { cursor: pointer; }
.syllabus [data-key]:hover { background: rgba(0,0,0,.03); }
.active-topic { background: rgba(0,0,0,.05); border-radius: 6px; }
.muted { opacity: .8; }

/* 8) Footer fijo */
.footer-bar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  height: var(--footer-h);
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0b1c35;  /* azul marino muy oscuro */
  color: #fff;
  font-size: .95rem;
  text-align: center;
  padding: 0 .75rem;
  box-shadow: 0 -6px 16px rgba(0,0,0,.08);
  z-index: 1000;
  line-height: 1.2; /* evita crecer por wraps raros */
}

/* 9) Responsivo */
@media (max-width: 768px) {
  .two-columns { grid-template-columns: 1fr; }
  .nav-buttons { flex-direction: column; gap: .5rem; padding: 1rem; }

  :root { --footer-h: 64px; } /* footer más alto en tablet/móvil */
  .footer-bar { font-size: .9rem; padding: 0 .6rem; }
}

@media (max-width: 420px) {
  :root { --footer-h: 84px; } /* footer más alto en móviles pequeños */
  .footer-bar { font-size: .85rem; padding: 0 .5rem; }
}
