/*
  Ceneval — Estilos base y menú responsive
  Mobile-first, tipografía legible, colores contrastados y transiciones suaves
*/

:root {
  --color-bg: #FAFAFA;        /* fondo claro */
  --color-bg-card: #FFFFFF;   /* tarjetas */
  --color-text: #111111;      /* texto principal */
  --color-muted: #6B6B6B;     /* texto secundario */
  --color-primary: #000000;   /* negro para acciones */
  --color-primary-700: #222222;
  --radius: 10px;             /* bordes sutiles */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg: 0 12px 24px rgba(0,0,0,0.12);
  --transition: 180ms ease;
  --container: 1100px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
html { scroll-behavior: smooth; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: -9999px;
}
.skip-link:focus {
  left: 16px;
  top: 16px;
  background: #fff;
  color: var(--color-text);
  padding: 8px 12px;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 16px;
}

.site-header {
  background: #FFFFFF;
  border-bottom: 1px solid #E5E5E5;
}
.site-title {
  margin: 0;
  padding-top: 28px;
  font-size: clamp(1.75rem, 2.4vw, 2.4rem);
  font-weight: 700;
}
.site-subtitle {
  margin: 8px 0 24px;
  color: var(--color-muted);
  font-weight: 500;
}

.site-main { padding: 24px 0 40px; }

.quiz-nav { margin: 8px auto 16px; }
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.nav-item {}
.nav-link {
  display: block;
  background: var(--color-bg-card);
  color: var(--color-text);
  text-decoration: none;
  padding: 16px 18px;
  border: 1px solid #E5E5E5;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), color var(--transition), background var(--transition);
}
.nav-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background: #F5F5F5;
  border-color: #D9D9D9;
}
.nav-link:focus-visible {
  outline: 3px solid #000;
  outline-offset: 2px;
}
.nav-link:active { transform: translateY(0); }

.info { color: var(--color-muted); }

.site-footer {
  border-top: 1px solid #E5E5E5;
  background: #FFFFFF;
  padding: 18px 0;
}
.site-footer small { color: var(--color-muted); }

/* Responsive layout */
@media (min-width: 640px) {
  .nav-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .nav-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Minimal: sin líneas decorativas */
.nav-link { position: relative; }
.nav-link::after { display: none; }

/* Botón fijo para volver al menú */
.menu-button {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1000;
  display: inline-block;
  background: #000000;
  color: #FFFFFF;
  text-decoration: none;
  border-radius: 999px;
  padding: 10px 14px;
  font-weight: 600;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.menu-button:hover { box-shadow: var(--shadow-lg); transform: translateY(-1px); background: #222222; }
.menu-button:focus-visible { outline: 3px solid #000; outline-offset: 2px; }

/* Modal accesible */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}
.modal-overlay[hidden] { display: none !important; }
.modal {
  width: min(560px, calc(100% - 32px));
  background: #FFFFFF;
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  border: 1px solid #E5E5E5;
  padding: 18px 18px 16px;
}
.modal .quiz-title { margin-top: 4px; margin-bottom: 10px; }
.modal .answer-feedback { margin-top: 8px; }
.modal .modal-actions { margin-top: 14px; display: flex; gap: 8px; justify-content: flex-end; }

/* Clases base reutilizables para futuros componentes de cuestionario */
.quiz-title {
  font-size: clamp(1.4rem, 2vw, 2rem);
  font-weight: 700;
  margin: 20px 0 12px;
}

.question-container {
  background: var(--color-bg-card);
  border: 1px solid #E5E5E5;
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}

.answer-option {
  display: block;
  background: #FFFFFF;
  border: 1px solid #E5E5E5;
  border-radius: 10px;
  padding: 12px 14px;
  margin: 8px 0;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.answer-option:hover {
  background: #F5F5F5;
  border-color: #D9D9D9;
  transform: translateY(-1px);
}
.answer-option:focus-visible {
  outline: 3px solid #000;
  outline-offset: 2px;
}

.answer-feedback {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #F0F0F0;
  color: #111111;
}

.finish-button {
  display: inline-block;
  background: var(--color-primary);
  color: #FFFFFF;
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.finish-button:hover {
  background: var(--color-primary-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.finish-button:focus-visible {
  outline: 3px solid #000;
  outline-offset: 2px;
}

/* Utilidades */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}