/* ==========================================================================
   Demostración de Web APIs — Sistema de diseño
   Tokens y estilo gráfico de brayandiazc.com (temas claro/oscuro).
   Reemplaza a Pico.css: hoja de estilos autocontenida, sin dependencias.
   ========================================================================== */

/* — Design tokens — */
:root,
[data-theme="light"] {
  --background: #fdfdfd;
  --foreground: #282728;
  --accent: #006cac;
  --accent-contrast: #ffffff;
  --muted: #e6e6e6;
  --muted-foreground: #6b7280;
  --border: #ece9e9;
  --card: #ffffff;
  --danger: #d33f2e;
  --success: #1a7f4b;
  --shadow: 0 12px 40px -18px rgb(0 0 0 / 0.25);
}

[data-theme="dark"] {
  --background: #212737;
  --foreground: #eaedf3;
  --accent: #ff6b01;
  --accent-contrast: #212737;
  --muted: #343f60;
  --muted-foreground: #afb9ca;
  --border: #4a5578;
  --card: #262c3f;
  --danger: #ff8a75;
  --success: #7ee2a8;
  --shadow: 0 12px 40px -18px rgb(0 0 0 / 0.55);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Google Sans Code", ui-monospace, "SF Mono", Menlo, Consolas,
    monospace;
  background: var(--background);
  color: var(--foreground);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* — Layout — */
.container,
main.container {
  width: min(1080px, 100% - 3rem);
  margin: 0 auto;
  padding: 1.5rem 0 3rem;
  flex: 1;
}

/* — Tipografía — */
h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  font-weight: 600;
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
}

p {
  color: var(--foreground);
}

a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

a:hover {
  text-decoration: underline;
}

code {
  background: var(--muted);
  border-radius: 4px;
  padding: 0.12em 0.4em;
  font-family: inherit;
  font-size: 0.9em;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

::selection {
  background: var(--accent);
  color: var(--accent-contrast);
}

/* — Cabecera de página — */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  width: min(1080px, 100% - 3rem);
  margin: 0 auto;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.page-header .brand {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted-foreground);
  font-weight: 500;
}

.page-header .brand::before {
  content: "// ";
  color: var(--accent);
}

/* Cabecera semántica interna de cada demo (header dentro de main) */
main > header {
  margin-bottom: 2rem;
}

main > header h1 {
  margin-bottom: 0.5rem;
}

.back-link {
  display: inline-block;
  font-size: 0.9rem;
  color: var(--muted-foreground);
}

.back-link:hover {
  color: var(--accent);
}

/* — Toggle de tema — */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--foreground);
  width: 2.4rem;
  height: 2.4rem;
  min-width: 2.4rem;
  font-size: 1.05rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* — Home: rejilla de tarjetas — */
.center-header {
  text-align: center;
  margin: 2.5rem 0 2.5rem;
}

.center-header p {
  color: var(--muted-foreground);
  max-width: 60ch;
  margin-inline: auto;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  background: var(--card);
  transition: transform 0.15s ease, border-color 0.15s ease,
    box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.card h2 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.card h2::before {
  content: "── ";
  color: var(--accent);
}

.card h2 a {
  color: var(--foreground);
}

.card:hover h2 a {
  color: var(--accent);
}

.card p {
  color: var(--muted-foreground);
  font-size: 0.92rem;
  margin: 0;
}

/* — Tarjetas / bloques de demo — */
article {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  background: var(--card);
}

article > header {
  font-weight: 600;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

section {
  margin-bottom: 1.5rem;
}

/* — Formularios y controles — */
label {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--muted-foreground);
  margin-bottom: 0.35rem;
}

input,
select,
textarea {
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--foreground);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.75rem;
  width: 100%;
  max-width: 100%;
  margin-bottom: 1rem;
}

input[type="checkbox"],
input[type="radio"] {
  width: auto;
  margin-right: 0.4rem;
  accent-color: var(--accent);
}

input[type="file"] {
  padding: 0.5rem;
  cursor: pointer;
}

input[type="color"] {
  height: 2.6rem;
  padding: 0.2rem;
  cursor: pointer;
}

input[type="range"] {
  accent-color: var(--accent);
  padding: 0;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: transparent;
}

/* — Botones — */
button,
.button {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: 8px;
  padding: 0.6rem 1.25rem;
  margin: 0 0.5rem 0.75rem 0;
  cursor: pointer;
  transition: filter 0.15s ease, background 0.15s ease, color 0.15s ease;
}

button:hover,
.button:hover {
  filter: brightness(1.1);
}

button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  filter: none;
}

/* Variante secundaria (Pico usaba .secondary) */
button.secondary,
.secondary {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

button.secondary:hover {
  background: var(--accent);
  color: var(--accent-contrast);
  filter: none;
}

/* — Área de salida de resultados — */
.output-area {
  min-height: 44px;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--muted) 30%, var(--background));
  margin-bottom: 1rem;
  font-size: 0.95rem;
  word-break: break-word;
}

/* — Canvas / multimedia — */
.bordered {
  border: 1px solid var(--border);
  border-radius: 8px;
}

.responsive-canvas {
  background: #fff;
  width: 100%;
  max-width: 100%;
  display: block;
  border-radius: 8px;
}

canvas,
video,
audio,
img {
  max-width: 100%;
}

video {
  border-radius: 8px;
}

audio {
  width: 100%;
  margin-top: 0.5rem;
}

/* — Animaciones — */
.animated-element {
  width: 50px;
  height: 50px;
  background: var(--accent);
  border-radius: 8px;
  margin-top: 1rem;
}

/* — Diálogos nativos — */
dialog {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem;
  background: var(--card);
  color: var(--foreground);
  box-shadow: var(--shadow);
  max-width: min(90vw, 480px);
}

dialog::backdrop {
  background: rgb(0 0 0 / 0.5);
  backdrop-filter: blur(2px);
}

dialog .close {
  background: transparent;
  color: var(--muted-foreground);
  border-color: var(--border);
}

/* — Pie de página — */
.center-footer,
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: auto;
  text-align: center;
}

.center-footer small,
.site-footer small {
  display: block;
  width: min(1080px, 100% - 3rem);
  margin: 0 auto;
  padding: 1.5rem 0;
  font-size: 0.82rem;
  color: var(--muted-foreground);
}

/* — Accesibilidad — */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}