/* Estilos generales para todos los elementos */
*,
::after,
::before {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

:root {
  /* Paleta de colores para modo claro y oscuro */
  --bg-color-200:#fffafa;
  --bg-color-200-75: hsl(214, 25%, 11%, 85%);
  --bg-color-400:#dfe4ec;
  --text-color:#151b23;
  --accent-color-200:#ffebe7;
  --accent-color-400:#ff1f19;
  --accent-color-500:hsl(2, 100%, 75%);

  --gradient: ;

  /* Tamaños */
  --box-width: min(55rem, 100%);
  --texto-base: clamp(1rem, 2vw, 1.5rem);

  /* Iconos */
  --menu: url('../img/menu-lg.svg');
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color-200:#151b23;
    --bg-color-200-75:#151b23bf;
    --bg-color-400:#212831;
    --text-color:#cfd7e2;
    --accent-color-200:#19100a;
    --accent-color-400:#ff843d;
    --accent-color-500:hsl(22, 100%, 78%);

    --menu: url('../img/menu.svg');
  }
}

.sr-only {
  display: block;
  width: 1px;
  height: 1px;
  overflow: hidden;
  position: absolute;
  top: -1000px;
  left: -1000px;
}

body {
  margin: 0;
  display: grid;
  justify-items: center;
  line-height: 1.6;
  background: var(--bg-color-200);
  color: var(--text-color);
}

header {
  width: var(--box-width);
  display: grid;
  grid-template-columns: 1fr 1fr;
  justify-content: space-between;
  align-items: center;
  align-content: center;
  background-color: var(--bg-color-400);
  position: sticky;
  z-index: 998; /* Stacking */
  border-radius: 2rem;
  padding: 0 1.5rem;
  top: 1rem;
}

header h1 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
  padding: 1.5rem 0;
  justify-self: start;
}

header ul {
  padding: 0;
  list-style: none;
}

.primary-navigation {
  display: grid;
  align-content: center;
  min-width: 65vw;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 999; /* Stacking */
  background-color: var(--bg-color-200-75);
  transform: translateX(+100%) translateY(0%);
  transition: transform 350ms ease-out;
}

.primary-navigation[data-visible="true"] {
  transform: translateX(0%) translateY(0%);
  transition: transform 350ms ease-out;
}

@supports (backdrop-filter: blur(1em)) {
  .primary-navigation {
    backdrop-filter: blur(2em);
  }
}

/* Compatibilidad iOS 9*/
@supports (-webkit-backdrop-filter: blur(1em)) {
  .primary-navigation {
    backdrop-filter: blur(2em);
    -webkit-backdrop-filter: blur(2em);
  }
}

.primary-navigation ul {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  height: 100%;
}

.menu-boton {
  padding: 0;
  justify-self: end;
  width: 2rem;
  aspect-ratio: 1/1;
  background: none;
  border: none;
  background-image: var(--menu);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}

.menu-boton:hover {
  background: none;
  border: none;
  background-image: var(--menu);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}

main {
  padding: 2rem;
  width: var(--box-width);
  display: grid;
}

section:first-of-type {
  min-height: 75vh;
}

section {
  min-height: 95vh;
  display: grid;
  justify-content: stretch;
  justify-items: left;
  align-content: center;
  align-items: center;
}

section:first-of-type > h1 {
  text-align: center;
  justify-self: stretch;
}

img {
  width: 100%;
  margin: 2rem 0;
}

h1,
h2,
h3,
strong {
  color: var(--accent-color-400);
  line-height: 1.3;
  margin: 0;
}

h1 {
  font-size: clamp(1.5rem, 5vw, 4rem);
  font-weight: 400;
  margin: 2rem 0 1.5rem;
}

h2 {
  font-size: clamp(1rem, 2.5vw, 2rem);
  margin: 1.5rem 0 0.5rem;
}

h3 {
  font-size: clamp(1rem, 2vw, 1.5rem);
  margin: 0.5rem 0;
}

code {
  margin: 0 0 1.5rem;
}

p {
  margin: 0.5rem 0;
}

p,
a,
ul {
  font-size: var(--texto-base);
}

span {
  display: inline-block;
  background-color: var(--accent-color-200);
  color: var(--accent-color-400);
  padding: 0.15rem 0.5rem 0.05rem;
  font-family: 'Courier New', Courier, monospace;
}

/* Estilos para los vínculos */
a:link,
a:visited {
  text-decoration: none;
  color: var(--accent-color-400);
}

a:hover,
a:active {
  color: var(--accent-color-500);
}

a.btn-fill:link,
a.btn-fill:visited {
  display: inline-block;
  background-color: var(--accent-color-200);
  color: var(--accent-color-400);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
}

a.btn-fill:hover,
a.btn-fill:active {
  background-color: var(--accent-color-400);
  color: var(--accent-color-200);
}

button {
  border: 0.25rem solid var(--accent-color-200);
  font-size: var(--texto-base);
  background-color: var(--accent-color-200);
  color: var(--accent-color-400);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
}

button:hover {
  border: 0.25rem solid var(--accent-color-400);
  background-color: var(--accent-color-400);
  color: var(--accent-color-200);
}

/* Footer */
footer {
  background-color: var(--bg-color-200);
  padding: 2rem 0 1rem;
}

/* Ejemplo clase 2 */

#imagenes img {
  border-radius: 2rem;
  box-shadow: none;
  border: 0.15rem solid var(--text-color);

  width: 22rem;
  filter: grayscale(100%);
}

#imagenes img:hover {
  border: 0.15rem solid var(--accent-color-400);
  box-shadow: 0 1rem 2rem 0.5rem var(--bg-color-200);
  filter: grayscale(0%);
  cursor: pointer;
}