/* ============================================================
   Curso personal — hoja de estilos compartida
   Dirección: "bitácora técnica de laboratorio" — papel cálido,
   tipografía con carácter, acentos de "circuito" ámbar/cian.
   ============================================================ */

:root {
  --bg: #f6f2e9;
  --bg-elevated: #fffdf8;
  --bg-inset: #eee7d8;
  --text: #201c14;
  --text-dim: #5c5644;
  --text-faint: #8b8570;
  --border: #ddd3ba;
  --border-strong: #c9bc98;
  --accent: #b5560f;
  --accent-soft: #f0dcc4;
  --accent-ink: #7a3a09;
  --accent-2: #1f6f66;
  --accent-2-soft: #d9ece7;
  --code-bg: #211d15;
  --code-text: #f1e9d8;
  --code-accent: #f2b04c;
  --code-string: #9fd4a3;
  --code-comment: #8b8570;
  --callout-update-bg: #eaf3ef;
  --callout-update-border: #1f6f66;
  --callout-original-bg: #f5efe0;
  --callout-original-border: #b5560f;
  --accent-3: #6a4c93;
  --accent-3-soft: #e9e1f2;
  --callout-yours-bg: #f1ecf7;
  --callout-yours-border: #6a4c93;
  --shadow: 0 1px 2px rgba(32, 28, 20, 0.06), 0 8px 24px rgba(32, 28, 20, 0.08);
  --shadow-lift: 0 2px 4px rgba(32, 28, 20, 0.08), 0 16px 40px rgba(32, 28, 20, 0.14);
  --serif: Iowan Old Style, "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, "Segoe UI", Inter, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12100c;
    --bg-elevated: #1a170f;
    --bg-inset: #211d15;
    --text: #ede6d6;
    --text-dim: #b8ae94;
    --text-faint: #7d745e;
    --border: #332d21;
    --border-strong: #4a4230;
    --accent: #f2a154;
    --accent-soft: #3a2c18;
    --accent-ink: #ffcf9b;
    --accent-2: #5bc4b6;
    --accent-2-soft: #17332e;
    --code-bg: #0b0a07;
    --code-text: #f1e9d8;
    --code-accent: #f2b04c;
    --code-string: #9fd4a3;
    --code-comment: #7d745e;
    --callout-update-bg: #10231f;
    --callout-update-border: #5bc4b6;
    --callout-original-bg: #241f13;
    --callout-original-border: #f2a154;
    --accent-3: #b39ddb;
    --accent-3-soft: #241c30;
    --callout-yours-bg: #1c1626;
    --callout-yours-border: #b39ddb;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.35), 0 16px 40px rgba(0, 0, 0, 0.45);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent); }

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

/* ---------- barra superior global ---------- */

.site-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1.5rem;
  background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}

.site-bar .crumbs { color: var(--text-dim); display: flex; gap: 0.4rem; align-items: center; flex-wrap: wrap; }
.site-bar .crumbs a { color: var(--text-dim); }
.site-bar .crumbs a:hover { color: var(--accent); }
.site-bar .crumbs .sep { color: var(--text-faint); }
.site-bar .crumbs .current { color: var(--text); font-weight: 600; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: var(--accent-2-soft);
  color: var(--accent-2);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ---------- layout de capítulo (sidebar + contenido) ---------- */

.chapter-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 0;
  max-width: 1240px;
  margin: 0 auto;
  align-items: start;
}

.toc {
  position: sticky;
  top: 60px;
  align-self: start;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  padding: 2rem 1.25rem 2rem 1.5rem;
  font-size: 0.86rem;
}

.toc-heading {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 0.95rem;
  margin: 0 0 0.75rem;
  color: var(--text);
}

.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--border);
}

.toc li { margin: 0; }

.toc a {
  display: block;
  padding: 0.42rem 0 0.42rem 0.9rem;
  margin-left: -2px;
  border-left: 2px solid transparent;
  color: var(--text-dim);
  text-decoration: none;
}

.toc a:hover { color: var(--accent); border-left-color: var(--border-strong); }

.toc-progress {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 0.78rem;
  line-height: 1.5;
}

main.content {
  padding: 3rem clamp(1.25rem, 4vw, 4rem) 6rem;
  min-width: 0;
}

.content > * { max-width: 720px; }
.content > .wide { max-width: none; }

.kicker {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.6rem;
}

h1.chapter-title {
  font-family: var(--serif);
  font-size: clamp(2.1rem, 4vw, 3rem);
  line-height: 1.08;
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}

.chapter-dek {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 0 2.5rem;
}

.content h2 {
  font-family: var(--serif);
  font-size: 1.7rem;
  margin: 3rem 0 1rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--border);
  scroll-margin-top: 80px;
}

.content h2:first-of-type { border-top: none; margin-top: 0; }

.content h3 {
  font-family: var(--serif);
  font-size: 1.28rem;
  margin: 2rem 0 0.75rem;
  scroll-margin-top: 80px;
}

.content p { margin: 0 0 1.15rem; }
.content ul, .content ol { margin: 0 0 1.15rem; padding-left: 1.4rem; }
.content li { margin-bottom: 0.4rem; }
.content strong { color: var(--text); }

/* ---------- callouts: contraste "original 2022" vs "actualizado" ---------- */

.callout {
  max-width: 680px;
  margin: 1.5rem 0 1.75rem;
  padding: 1.1rem 1.3rem;
  border-radius: 10px;
  border: 1px solid transparent;
  font-size: 0.96rem;
}

.callout-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.callout-update {
  background: var(--callout-update-bg);
  border-color: var(--callout-update-border);
}
.callout-update .callout-label { color: var(--accent-2); }

.callout-original {
  background: var(--callout-original-bg);
  border-color: var(--callout-original-border);
}
.callout-original .callout-label { color: var(--accent-ink); }

.callout-yours {
  background: var(--callout-yours-bg);
  border-color: var(--callout-yours-border);
}
.callout-yours .callout-label { color: var(--accent-3); }

.callout p:last-child { margin-bottom: 0; }

/* ---------- ficha de proyecto propio (portada de página aplicada) ---------- */

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 2rem;
}

.project-meta span {
  font-size: 0.78rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--bg-inset);
  color: var(--text-dim);
  border: 1px solid var(--border);
}

.pull-quote {
  max-width: 640px;
  margin: 2rem 0;
  padding: 0 0 0 1.4rem;
  border-left: 3px solid var(--accent-3);
  font-family: var(--serif);
  font-size: 1.3rem;
  line-height: 1.45;
  color: var(--text);
}

/* ---------- código ---------- */

.content pre {
  max-width: 680px;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1.1rem 1.3rem;
  border-radius: 10px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.6;
  box-shadow: var(--shadow);
  margin: 0 0 1.5rem;
}

.content code {
  font-family: var(--mono);
  font-size: 0.87em;
  background: var(--bg-inset);
  padding: 0.12em 0.4em;
  border-radius: 5px;
}

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

.tok-str { color: var(--code-string); }
.tok-com { color: var(--code-comment); font-style: italic; }
.tok-key { color: var(--code-accent); }

pre + .pre-caption, .code-out {
  max-width: 680px;
  margin-top: -1.1rem;
  margin-bottom: 1.5rem;
  color: var(--text-faint);
  font-size: 0.82rem;
}

/* ---------- tablas ---------- */

.content table {
  width: 100%;
  max-width: 720px;
  border-collapse: collapse;
  margin: 0 0 1.75rem;
  font-size: 0.92rem;
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
  border-radius: 10px;
  overflow: hidden;
}

.content th, .content td {
  text-align: left;
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--border);
}

.content th {
  background: var(--bg-inset);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

.content tr:last-child td { border-bottom: none; }

/* ---------- diagramas inline ---------- */

.diagram {
  max-width: 100%;
  width: 100%;
  margin: 1.5rem 0 2rem;
  padding: 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow-x: auto;
}

.diagram svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
.diagram figcaption { margin-top: 1rem; text-align: center; color: var(--text-dim); font-size: 0.88rem; }

/* ---------- tarjetas de resumen / grid ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  max-width: 720px;
  margin: 1.5rem 0 2rem;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem 1.2rem;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lift); border-color: var(--border-strong); }
.card h4 { margin: 0 0 0.4rem; font-size: 0.98rem; }
.card p { margin: 0; font-size: 0.86rem; color: var(--text-dim); }

/* ---------- ejercicio / práctica ---------- */

.practice {
  max-width: 680px;
  margin: 1.75rem 0;
  padding: 1.25rem 1.4rem;
  border-radius: 12px;
  background: var(--accent-soft);
  border: 1px dashed var(--border-strong);
}

.practice .callout-label { color: var(--accent-ink); }

/* ---------- pie de capítulo: navegación ---------- */

.chapter-nav {
  max-width: 720px;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.chapter-nav a {
  flex: 1;
  padding: 1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  background: var(--bg-elevated);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.chapter-nav a:hover { border-color: var(--accent); transform: translateY(-2px); }
.chapter-nav .dir { display: block; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-faint); margin-bottom: 0.25rem; }
.chapter-nav .next { text-align: right; margin-left: auto; }

@media (max-width: 880px) {
  .chapter-layout { grid-template-columns: 1fr; }
  .toc { position: static; max-height: none; padding: 1.5rem 1.25rem 0; border-bottom: 1px solid var(--border); }
  main.content { padding: 2rem 1.25rem 4rem; }
}