/* ============================================================
   Curso Vaisala — Design tokens
   Optimizado para audiencia 50+ años:
   - Tipografía grande (base 18px)
   - Contraste alto
   - Espaciado generoso
   - Fondo oscuro EFC con paneles legibles
   ============================================================ */
:root {
  /* Marca EFC */
  --efc-green: #8AC42F;
  --efc-green-hover: #9ed644;
  --efc-orange: #ff7a00;
  --efc-black: #0a0f1a;

  /* Fondos */
  --bg-1: #050810;
  --bg-2: #0a0f1a;
  --bg-3: #111827;
  --panel: rgba(20, 26, 40, 0.85);
  --panel-soft: rgba(20, 26, 40, 0.55);
  --border: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.22);

  /* Tipografía */
  --text-1: #ffffff;
  --text-2: rgba(255, 255, 255, 0.82);
  --text-3: rgba(255, 255, 255, 0.62);
  --text-dim: rgba(255, 255, 255, 0.42);

  /* Tamaños — más grandes que un sitio normal (audiencia 50+) */
  --fs-base: 18px;
  --fs-sm: 16px;
  --fs-lg: 21px;
  --fs-xl: 28px;
  --fs-2xl: 38px;
  --fs-3xl: 52px;
  --fs-hero: 72px;

  /* Espaciado */
  --sp-1: 6px;
  --sp-2: 12px;
  --sp-3: 20px;
  --sp-4: 32px;
  --sp-5: 48px;
  --sp-6: 72px;
  --sp-7: 100px;

  /* Radios */
  --rad-sm: 8px;
  --rad-md: 14px;
  --rad-lg: 20px;

  /* Sombras */
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
  --glow-green: 0 0 0 4px rgba(138, 196, 47, 0.18);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-2);
  color: var(--text-1);
  font-family: "Helvetica Neue", "Inter", "Calibri", system-ui, -apple-system, sans-serif;
  font-size: var(--fs-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg, video { max-width: 100%; height: auto; display: block; }

button { font: inherit; color: inherit; }

a { color: var(--efc-green); text-decoration: none; }
a:hover { color: var(--efc-green-hover); text-decoration: underline; }

/* Botón principal EFC */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  font-size: var(--fs-base);
  font-weight: 700;
  border: none;
  border-radius: var(--rad-md);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  text-decoration: none;
}
.btn-primary {
  background: var(--efc-green);
  color: var(--efc-black);
}
.btn-primary:hover {
  background: var(--efc-green-hover);
  transform: translateY(-1px);
  box-shadow: var(--glow-green);
  text-decoration: none;
}
.btn-ghost {
  background: transparent;
  color: var(--text-1);
  border: 2px solid var(--border-strong);
}
.btn-ghost:hover {
  border-color: var(--efc-green);
  color: var(--efc-green);
  text-decoration: none;
}
.btn-lg { padding: 18px 34px; font-size: var(--fs-lg); }

/* Layout */
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 var(--sp-4); }
.wrap-narrow { max-width: 880px; margin: 0 auto; padding: 0 var(--sp-4); }

/* Tarjeta */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--rad-lg);
  padding: var(--sp-4);
  box-shadow: var(--shadow-md);
}

/* Pill / chip */
.pill {
  display: inline-block;
  padding: 6px 14px;
  font-size: var(--fs-sm);
  font-weight: 700;
  border-radius: 999px;
  background: rgba(138, 196, 47, 0.16);
  color: var(--efc-green);
  border: 1px solid rgba(138, 196, 47, 0.32);
  letter-spacing: 0.4px;
}
.pill-orange {
  background: rgba(255, 122, 0, 0.16);
  color: var(--efc-orange);
  border-color: rgba(255, 122, 0, 0.32);
}
.pill-muted {
  background: rgba(255,255,255,0.06);
  color: var(--text-3);
  border-color: var(--border);
}

/* Header */
.efc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px var(--sp-4);
  background: #0a0f1aee;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
@media (max-width: 600px) {
  .efc-header { padding: 12px 16px; }
  .efc-header .brand { font-size: 17px; gap: 10px; }
  .efc-header .brand img { height: 30px; }
}
.efc-header .brand {
  display: flex;
  align-items: center;
  gap: 14px;
  font-weight: 800;
  font-size: var(--fs-lg);
  letter-spacing: 0.3px;
}
.efc-header .brand img { height: 36px; }
.efc-header .brand span.accent { color: var(--efc-green); }

/* Tipografía de páginas */
h1, h2, h3 { line-height: 1.18; margin: 0 0 var(--sp-3); font-weight: 800; letter-spacing: -0.01em; }
h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); margin-top: var(--sp-6); }
h3 { font-size: var(--fs-xl); margin-top: var(--sp-5); color: var(--efc-green); }
p  { margin: 0 0 var(--sp-3); color: var(--text-2); }

/* Glosario / términos en inglés que oirán en Boulder */
.term-en {
  display: inline-block;
  padding: 2px 8px;
  margin: 0 2px;
  background: rgba(255, 122, 0, 0.14);
  color: var(--efc-orange);
  border: 1px solid rgba(255, 122, 0, 0.3);
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.94em;
  cursor: help;
}

/* Acordeón / detalles desplegables */
details {
  border: 1px solid var(--border);
  border-radius: var(--rad-md);
  padding: var(--sp-3);
  margin-bottom: var(--sp-2);
  background: var(--panel-soft);
}
details summary {
  cursor: pointer;
  font-weight: 700;
  font-size: var(--fs-lg);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
}
details summary::-webkit-details-marker { display: none; }
details summary::before {
  content: "+";
  display: inline-block;
  width: 28px; height: 28px;
  background: var(--efc-green);
  color: var(--efc-black);
  border-radius: 50%;
  text-align: center;
  line-height: 28px;
  font-weight: 900;
  font-size: 22px;
  transition: transform 0.2s;
}
details[open] summary::before { content: "−"; }
details[open] { background: var(--panel); }

/* Banner accesibilidad — texto grande */
.a11y-note {
  font-size: var(--fs-sm);
  color: var(--text-3);
  background: var(--panel-soft);
  border-left: 4px solid var(--efc-green);
  padding: 12px 18px;
  border-radius: 6px;
  margin: var(--sp-3) 0;
}

/* Tabla limpia */
.efc-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--sp-3) 0;
  background: var(--panel-soft);
  border-radius: var(--rad-md);
  overflow: hidden;
}
.efc-table th, .efc-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.efc-table th {
  background: rgba(138, 196, 47, 0.1);
  color: var(--efc-green);
  font-weight: 800;
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.efc-table tr:last-child td { border-bottom: none; }

/* Responsive */
@media (max-width: 720px) {
  :root {
    --fs-base: 17px;
    --fs-lg: 19px;
    --fs-xl: 24px;
    --fs-2xl: 30px;
    --fs-3xl: 38px;
    --fs-hero: 48px;
  }
  .wrap { padding: 0 var(--sp-3); }
  .efc-header { padding: 14px 18px; }
}

/* Accesibilidad: respeta preferencias del usuario */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}