/* Estilos de toda la web. Un único archivo, sin frameworks. */

/* --- Colores y medidas (cámbialos aquí y se aplican en todas partes) --- */
:root {
  --bg: #fdfdfc;
  --surface: #f3f3f0;
  --text: #1d1d1b;
  --muted: #5f5f5a;
  --border: #dddcd6;
  --accent: #1f5fbf;
  --accent-text: #ffffff;

  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "Cascadia Code", Consolas, monospace;
  --width: 46rem;
  --radius: 8px;
}

/* Modo oscuro: se activa solo si el sistema del visitante está en oscuro */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --surface: #222220;
    --text: #ececea;
    --muted: #a5a59f;
    --border: #3a3a37;
    --accent: #7fb0ff;
    --accent-text: #0f1a2c;
  }
}

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

html {
  color-scheme: light dark;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

h1,
h2,
h3 {
  line-height: 1.25;
}

h1 {
  font-size: clamp(1.75rem, 5vw, 2.4rem);
  margin: 0 0 0.75rem;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--surface);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

pre {
  background: var(--surface);
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  max-width: var(--width);
  margin: 0 auto;
  padding: 0 1rem;
}

main {
  padding-top: 2.5rem;
  padding-bottom: 3rem;
}

/* --- Cabecera y pie --- */
.site-header {
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.site-title {
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.site-header nav {
  display: flex;
  gap: 1.25rem;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-header nav a:hover {
  color: var(--text);
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
  padding: 1.5rem 0;
}

/* --- Listado de charlas --- */
.lead {
  color: var(--muted);
  font-size: 1.125rem;
  margin-top: 0;
}

.talk-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
  display: grid;
  gap: 1rem;
}

.talk-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.talk-card h2 {
  font-size: 1.25rem;
  margin: 0 0 0.25rem;
}

.talk-card h2 a {
  color: var(--text);
  text-decoration: none;
}

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

.meta {
  color: var(--muted);
  margin: 0 0 0.75rem;
}

.more {
  font-weight: 600;
}

.empty {
  color: var(--muted);
  font-style: italic;
}

.tags {
  list-style: none;
  padding: 0;
  margin: 0 0 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tags li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.05rem 0.65rem;
  font-size: 0.8125rem;
}

/* --- Detalle de charla --- */
.back {
  margin: 0 0 1.5rem;
}

.talk-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  gap: 0.75rem 1.5rem;
  margin: 1.25rem 0;
}

.talk-meta dt {
  color: var(--muted);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.talk-meta dd {
  margin: 0;
}

.summary {
  font-size: 1.125rem;
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1.5rem 0;
}

.slides,
.resources {
  margin-top: 2.5rem;
}

/* iframe 16:9 que se adapta al ancho */
.embed {
  aspect-ratio: 16 / 9;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 1rem;
}

.embed iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.pdf-viewer {
  width: 100%;
  height: 70vh;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.button {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-text);
  text-decoration: none;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
}

.button:hover {
  opacity: 0.9;
}