/* ==========================================================================
   Curso: Excel aplicado a la contabilidad
   Hoja de estilos compartida (todas las lecciones y referencias la enlazan)
   ========================================================================== */

:root {
  /* Paleta: papel cálido, tinta profunda, verde contable, ámbar de aviso */
  --paper:      #fbfaf7;
  --paper-2:    #f4f1ea;
  --card:       #ffffff;
  --ink:        #1c1917;
  --ink-soft:   #44403c;
  --muted:      #6b645c;
  --rule:       #e6e0d6;
  --rule-strong:#cfc7b9;

  --accent:      #0b6b53;
  --accent-deep: #085041;
  --accent-soft: #e7f2ee;

  --warn:        #b45309;
  --warn-soft:   #fdf3e7;
  --good:        #15803d;
  --good-soft:   #e9f5ec;
  --bad:         #b91c1c;
  --bad-soft:    #fbeaea;

  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino,
           "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans:  ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
           "Helvetica Neue", Arial, sans-serif;
  --mono:  ui-monospace, "Cascadia Code", "JetBrains Mono", Menlo, Consolas,
           "Liberation Mono", monospace;

  --measure: 68ch;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(28,25,23,.05), 0 8px 24px -12px rgba(28,25,23,.18);
}

/* ------------------------------- Base ---------------------------------- */

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: calc(var(--measure) + 6rem);
  margin: 0 auto;
  padding: 3rem 2rem 6rem;
}

/* ------------------------------ Enlaces -------------------------------- */

a { color: var(--accent-deep); text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent); text-underline-offset: .18em; }
a:hover { text-decoration-color: var(--accent); }

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* --------------------------- Encabezado --------------------------------- */

.eyebrow {
  font-family: var(--sans);
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1rem;
}

h1 {
  font-size: clamp(1.9rem, 4.5vw, 2.9rem);
  line-height: 1.12;
  letter-spacing: -.015em;
  margin: 0 0 .6rem;
  text-wrap: balance;
}

.lede {
  font-size: 1.2rem;
  line-height: 1.5;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
  max-width: 44ch;
}

.meta {
  font-family: var(--sans);
  font-size: .82rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.1rem;
  padding: 1rem 0 0;
  border-top: 1px solid var(--rule);
}
.meta b { color: var(--ink-soft); font-weight: 600; }

/* --------------------------- Secciones ---------------------------------- */

section { margin: 3rem 0 0; }

h2 {
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 3rem 0 .9rem;
  padding-top: 1.4rem;
  border-top: 2px solid var(--ink);
  display: flex;
  align-items: baseline;
  gap: .7rem;
  text-wrap: balance;
}
h2 .num {
  font-family: var(--sans);
  font-size: .8rem;
  font-weight: 800;
  color: var(--paper);
  background: var(--ink);
  border-radius: 999px;
  padding: .15rem .55rem;
  transform: translateY(-.15rem);
}

h3 {
  font-size: 1.13rem;
  margin: 1.8rem 0 .5rem;
  letter-spacing: -.005em;
}

p { margin: 0 0 1rem; }
p + ul, p + ol { margin-top: -.35rem; }
ul, ol { padding-left: 1.3rem; }
li { margin: .3rem 0; }
li::marker { color: var(--accent); }

strong { color: var(--ink); }

/* Término destacado dentro del texto */
.term {
  font-weight: 700;
  background: linear-gradient(transparent 62%, var(--accent-soft) 62%);
  padding: 0 .05em;
}

small, .small { font-size: .86rem; color: var(--muted); }

/* ------------------------------ Código ---------------------------------- */

code {
  font-family: var(--mono);
  font-size: .84em;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: .1em .35em;
  white-space: nowrap;
}

kbd {
  font-family: var(--sans);
  font-size: .78em;
  font-weight: 700;
  background: #fff;
  border: 1px solid var(--rule-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: .08em .45em;
  box-shadow: 0 1px 0 var(--rule);
}

pre {
  background: #1f2933;
  color: #e8eef2;
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  overflow-x: auto;
  font-size: .84rem;
  line-height: 1.5;
  box-shadow: var(--shadow);
}
pre code { background: none; border: 0; color: inherit; font-size: 1em; white-space: pre; }

/* ------------------------------ Tarjetas -------------------------------- */

.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.2rem 1.35rem;
  box-shadow: var(--shadow);
  margin: 1.2rem 0;
}
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }

.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1rem; }

/* ------------------------------ Avisos ---------------------------------- */

.callout {
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: .9rem 1.15rem;
  margin: 1.3rem 0;
}
.callout > :first-child { margin-top: 0; }
.callout > :last-child { margin-bottom: 0; }
.callout .label {
  font-family: var(--sans);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent-deep);
  display: block;
  margin-bottom: .25rem;
}
.callout.warn { border-color: var(--warn); background: var(--warn-soft); }
.callout.warn .label { color: var(--warn); }
.callout.teach { border-color: var(--ink); background: var(--paper-2); }
.callout.teach .label { color: var(--ink); }

/* ------------------------------- Tablas --------------------------------- */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: .95rem;
  font-family: var(--sans);
  background: var(--card);
}
caption { caption-side: top; text-align: left; font-family: var(--sans); font-size: .8rem; color: var(--muted); padding-bottom: .4rem; }
th, td { text-align: left; padding: .55rem .7rem; border-bottom: 1px solid var(--rule); }
thead th { border-bottom: 2px solid var(--ink); font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; }
tbody tr:hover { background: var(--paper-2); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; font-family: var(--mono); }

/* ------------------------- Rejilla tipo Excel --------------------------- */

.sheet {
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: .82rem;
  margin: 1.2rem 0;
  width: auto;
}
.sheet th {
  background: var(--paper-2);
  color: var(--muted);
  text-align: center;
  font-weight: 700;
  border: 1px solid var(--rule);
  padding: .3rem .55rem;
  min-width: 2.6rem;
}
.sheet td {
  border: 1px solid var(--rule);
  text-align: center;
  padding: .3rem .55rem;
  background: var(--card);
  color: var(--ink-soft);
}
.sheet .corner { background: var(--rule); }
.sheet td.hl { background: var(--accent-soft); color: var(--accent-deep); font-weight: 700; outline: 2px solid var(--accent); outline-offset: -2px; }
.sheet td.range { background: var(--accent-soft); color: var(--accent-deep); }
.sheet th.hl { background: var(--accent); color: #fff; }

/* ------------------------------- Detalles ------------------------------- */

details {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  padding: .1rem 1.15rem;
  margin: 1.1rem 0;
  box-shadow: var(--shadow);
}
details[open] { padding-bottom: 1rem; }
summary {
  cursor: pointer;
  font-family: var(--sans);
  font-weight: 700;
  font-size: .95rem;
  padding: .85rem 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: .6rem;
}
summary::-webkit-details-marker { display: none; }
summary::before {
  content: "+";
  font-family: var(--mono);
  color: var(--accent);
  font-size: 1.1rem;
  width: 1.1rem;
  text-align: center;
}
details[open] summary::before { content: "–"; }
details > :not(summary):first-of-type { margin-top: .2rem; }

/* -------------------------------- Quiz ---------------------------------- */

.quiz {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
  padding: 1.2rem 1.35rem .4rem;
  margin: 1.4rem 0;
}
.quiz-head {
  font-family: var(--sans);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: .6rem;
  margin-bottom: .4rem;
}
.quiz-score { color: var(--accent); }

.quiz-q { padding: 1rem 0 .5rem; border-bottom: 1px dashed var(--rule); }
.quiz-q:last-of-type { border-bottom: 0; }
.quiz-prompt { font-weight: 700; margin: 0 0 .7rem; }
.quiz-prompt .qnum { font-family: var(--sans); font-size: .8rem; color: var(--accent); margin-right: .4rem; }

.quiz-opts { display: grid; gap: .5rem; margin: 0; padding: 0; list-style: none; }
.quiz-opt {
  font: inherit;
  font-family: var(--sans);
  font-size: .95rem;
  text-align: left;
  width: 100%;
  background: var(--paper);
  border: 1.5px solid var(--rule-strong);
  border-radius: 8px;
  padding: .6rem .8rem;
  cursor: pointer;
  color: var(--ink-soft);
  transition: background .12s, border-color .12s, transform .06s;
}
.quiz-opt:hover:not(:disabled) { background: var(--accent-soft); border-color: var(--accent); }
.quiz-opt:active:not(:disabled) { transform: translateY(1px); }
.quiz-opt::before {
  content: attr(data-key);
  display: inline-block;
  width: 1.35rem;
  font-weight: 800;
  color: var(--muted);
}
.quiz-opt.correct { background: var(--good-soft); border-color: var(--good); color: var(--good); font-weight: 700; }
.quiz-opt.correct::before { color: var(--good); }
.quiz-opt.wrong { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); animation: shake .3s; }
.quiz-opt.wrong::before { color: var(--bad); }
.quiz-opt:disabled { cursor: default; opacity: .55; }
.quiz-opt.correct:disabled { opacity: 1; }

@keyframes shake {
  0%,100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}
@media (prefers-reduced-motion: reduce) { * { animation: none !important; scroll-behavior: auto; } }

.quiz-explain {
  font-size: .9rem;
  background: var(--paper-2);
  border-radius: 8px;
  padding: .6rem .8rem .6rem;
  margin: .7rem 0 0;
  color: var(--ink-soft);
  border-left: 3px solid var(--good);
}
.quiz-explain[hidden] { display: none; }
.quiz-done { font-size: .85rem; font-family: var(--sans); color: var(--good); margin: 0 0 .4rem; font-weight: 700; }
.quiz-reset {
  font-family: var(--sans);
  font-size: .82rem;
  font-weight: 700;
  background: none;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  padding: .3rem .9rem;
  cursor: pointer;
  color: var(--muted);
  margin: 0 0 1rem;
}
.quiz-reset:hover { border-color: var(--accent); color: var(--accent-deep); }

/* ---------------------------- Pasos / tareas ---------------------------- */

.steps { counter-reset: step; list-style: none; padding: 0; }
.steps > li {
  counter-increment: step;
  position: relative;
  padding: .2rem 0 .9rem 2.7rem;
}
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: .05rem;
  width: 1.8rem; height: 1.8rem;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: .85rem;
  display: grid;
  place-items: center;
}

/* ------------------------------ Pie / nav ------------------------------- */

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem 1.2rem;
  font-family: var(--sans);
  font-size: .88rem;
  margin: .2rem 0 0;
}
.nav a { font-weight: 600; text-decoration: none; }
.nav a:hover { text-decoration: underline; }

hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: .86rem;
  color: var(--muted);
}

.ask {
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  margin: 2.5rem 0 0;
  box-shadow: var(--shadow);
}
.ask h3 { color: #fff; margin-top: 0; }
.ask p { color: #d6d3d1; margin-bottom: .5rem; }
.ask strong { color: #fff; }
.ask .label {
  font-family: var(--sans); font-size: .72rem; font-weight: 800;
  letter-spacing: .1em; text-transform: uppercase; color: #7dd3c0;
  display: block; margin-bottom: .3rem;
}

.tag {
  display: inline-block;
  font-family: var(--sans);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--accent-deep);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: .15rem .6rem;
}

/* -------------------------------- Print --------------------------------- */

@media print {
  :root { --paper: #fff; }
  .wrap { max-width: none; padding: 0; }
  body { font-size: 10.5pt; }
  h2 { break-after: avoid; }
  .card, details, table, .quiz, .sheet { break-inside: avoid; }
  .quiz-opt { border-color: #999; }
  details { box-shadow: none; }
  details:not([open]) > summary::after { content: " (contenido plegado)"; font-weight: 400; color: #666; }
  a { color: #000; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 8.5pt; color: #444; }
  .ask { background: #fff; color: #000; border: 1px solid #000; }
  .ask h3, .ask strong, .ask .label { color: #000; }
  .ask p { color: #000; }
}