/* ==========================================================================
   Base — PyCon Panamá 2026
   Reset, elementos HTML y accesibilidad. Sin layout de página: eso vive
   en style.css. Sin media queries: esas viven en responsive.css.
   ========================================================================== */

/* --- 1. Reset ------------------------------------------------------------ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  /* Compensa el header fijo al saltar a un ancla */
  scroll-padding-top: calc(var(--header-h) + var(--space-4));
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  /* El sitio es una columna: header, contenido que crece, footer al fondo */
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--text);
  background-color: var(--bg);
  /* Ninguna página debe desbordarse en horizontal */
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

main {
  flex: 1;
}

/* --- 2. Tipografía ------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--lh-heading);
  text-wrap: balance;
}

h1 { line-height: var(--lh-tight); }

p, li {
  text-wrap: pretty;
}

/* --- 3. Elementos -------------------------------------------------------- */

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), background-color var(--transition);
}

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

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: 0;
  background: none;
}

ul, ol {
  list-style: none;
}

/* --- 4. Accesibilidad ---------------------------------------------------- */

:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-sm);
}

/* El contenedor de <main> recibe foco al usar el salto; no debe dibujar anillo */
main:focus,
main:focus-visible {
  outline: none;
}

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--text-on-accent);
  font-weight: 700;
  transform: translateY(-200%);
  transition: transform var(--transition);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* Visible solo para lectores de pantalla */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}