/* ============================================================
   Cómo funciona la IA — sistema de diseño compartido
   Tema oscuro, acentos vivos, pensado para simuladores en Canvas
   ============================================================ */

:root {
  --bg: #0e1016;
  --bg-card: #171a23;
  --bg-card-hover: #1d2130;
  --bg-inset: #0a0c11;
  --border: #2a2f3e;
  --text: #e8eaf0;
  --text-dim: #9aa1b5;
  --text-faint: #646b7e;

  --accent: #6c8cff;      /* índigo */
  --accent-2: #3fd0c9;    /* cian */
  --accent-3: #ff9d5c;    /* naranja cálido */
  --accent-4: #e26cf5;    /* magenta */
  --ok: #4ade80;
  --warn: #fbbf24;
  --danger: #f87171;

  --grad: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);

  --radius: 14px;
  --radius-sm: 8px;
  --maxw: 880px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- tema claro ----------
   Los canvas de los simuladores mantienen fondo oscuro también en claro
   (sus colores están calibrados para ello): actúan como "pantallas". */
html[data-tema="claro"] {
  --bg: #f4f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #eef0f7;
  --bg-inset: #e8eaf2;
  --border: #d6dae5;
  --text: #1d2233;
  --text-dim: #545b73;
  --text-faint: #8b91a5;

  --accent: #4a63e0;
  --accent-2: #0d9d96;
  --accent-3: #d97a2b;
  --accent-4: #b13fd4;
  --ok: #1e9e50;
  --warn: #b07d08;
  --danger: #d64545;

  --grad: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
}

html[data-tema="claro"] canvas.viz {
  background: #0a0c11;
  border-color: #2a2f3e;
}

html[data-tema="claro"] button.primary,
html[data-tema="claro"] button.chip.active { color: #ffffff; }

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---------- layout ---------- */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

main.wrap { padding-bottom: 80px; }

section { margin: 56px 0; }

/* ---------- tipografía ---------- */
h1 {
  font-size: clamp(1.9rem, 5vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
}

h2 {
  font-size: clamp(1.35rem, 3.5vw, 1.8rem);
  letter-spacing: -0.01em;
  margin-bottom: 14px;
  font-weight: 750;
}

h3 { font-size: 1.15rem; margin-bottom: 10px; font-weight: 700; }

p { margin-bottom: 14px; color: var(--text); }
p.dim, .dim { color: var(--text-dim); }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

code, .mono { font-family: var(--mono); font-size: 0.92em; }

code {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
}

strong { font-weight: 700; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- cabecera de lección ---------- */
.lesson-header {
  padding: 28px 0 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.crumb {
  font-size: 0.9rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
}

.crumb a { color: var(--text-dim); }
.crumb a:hover { color: var(--text); text-decoration: none; }

.block-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border-radius: 99px;
  border: 1px solid var(--border);
  color: var(--text-dim);
  white-space: nowrap;
}

.hero { padding: 24px 0 8px; }

.hero .lead {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 620px;
  margin-top: 12px;
}

/* ---------- tarjetas / paneles ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.sim {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin: 24px 0;
}

.sim-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

.sim-title::before { content: "🎛"; font-size: 1.1rem; }

/* ---------- controles ---------- */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  align-items: center;
  margin: 14px 0;
}

.control { display: flex; flex-direction: column; gap: 5px; min-width: 150px; flex: 1; }
.control.fixed { flex: 0 0 auto; max-width: 100%; }

.control label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
}

.control label output { color: var(--accent-2); font-family: var(--mono); }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 99px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 1px 6px rgba(0,0,0,0.5);
  cursor: grab;
}

input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  cursor: grab;
}

textarea, input[type="text"] {
  width: 100%;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 1rem;
  padding: 12px 14px;
  resize: vertical;
}

textarea:focus, input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

button, .btn {
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 650;
  color: var(--text);
  background: var(--bg-card-hover);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 18px;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease;
  user-select: none;
}

button:hover { border-color: var(--accent); background: #232840; }
button:active { transform: scale(0.97); }

button.primary {
  background: var(--grad);
  border: none;
  color: #0a0c11;
}

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

button.chip {
  font-size: 0.85rem;
  padding: 5px 13px;
  border-radius: 99px;
}

button.chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #0a0c11;
}

button:disabled { opacity: 0.4; cursor: default; }

/* ---------- canvas ---------- */
canvas.viz {
  width: 100%;
  display: block;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  touch-action: none;
}

/* ---------- profundizar ---------- */
details.deep {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  margin: 20px 0;
  overflow: hidden;
}

details.deep summary {
  cursor: pointer;
  padding: 14px 18px;
  font-weight: 700;
  color: var(--accent);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
}

details.deep summary::-webkit-details-marker { display: none; }
details.deep summary::before { content: "🔍"; }
details.deep summary::after {
  content: "▾";
  margin-left: auto;
  transition: transform 0.2s;
  color: var(--text-faint);
}
details.deep[open] summary::after { transform: rotate(180deg); }

details.deep .deep-body { padding: 4px 18px 18px; color: var(--text-dim); }
details.deep .deep-body p { color: var(--text-dim); }
details.deep .deep-body strong { color: var(--text); }

/* ---------- llevarse / takeaways ---------- */
.takeaways {
  background: linear-gradient(135deg, rgba(108,140,255,0.09), rgba(63,208,201,0.09));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}

.takeaways h2 { margin-bottom: 16px; }

.takeaways ul { list-style: none; }

.takeaways li {
  padding: 8px 0 8px 36px;
  position: relative;
  font-size: 1.05rem;
}

.takeaways li::before {
  content: "→";
  position: absolute;
  left: 6px;
  color: var(--accent-2);
  font-weight: 800;
}

/* ---------- navegación entre lecciones ---------- */
.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 48px;
}

.lesson-nav a {
  flex: 1;
  max-width: 48%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s, background 0.15s;
}

.lesson-nav a:hover { border-color: var(--accent); background: var(--bg-card-hover); text-decoration: none; }
.lesson-nav a.next { text-align: right; margin-left: auto; }
.lesson-nav .nav-label { font-size: 0.78rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.06em; }
.lesson-nav .nav-title { font-weight: 700; color: var(--accent); }

/* ---------- portada ---------- */
.home-hero { padding: 72px 0 30px; text-align: center; }

.home-hero .lead {
  font-size: 1.2rem;
  color: var(--text-dim);
  max-width: 560px;
  margin: 18px auto 0;
}

.block-section { margin: 48px 0; }

.block-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.block-num {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--text-faint);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

a.lesson-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.12s ease, border-color 0.15s, background 0.15s;
}

a.lesson-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  background: var(--bg-card-hover);
  text-decoration: none;
}

.lesson-card .emoji { font-size: 1.7rem; display: block; margin-bottom: 10px; }
.lesson-card .name { font-weight: 700; font-size: 1.02rem; line-height: 1.3; }
.lesson-card .desc { font-size: 0.86rem; color: var(--text-dim); margin-top: 6px; line-height: 1.45; }

.lesson-card.soon {
  opacity: 0.45;
  pointer-events: none;
}

.lesson-card.bloqueada {
  opacity: 0.7;
  border-style: dashed;
}

.lesson-card.bloqueada .name::after { content: none; }

.lesson-card .candado {
  margin-top: 10px;
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--warn);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

a.lesson-card { position: relative; }

a.lesson-card.vista::after {
  content: "✓ vista";
  position: absolute;
  top: 12px;
  right: 14px;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--ok);
  border: 1px solid var(--ok);
  border-radius: 99px;
  padding: 1px 8px;
  opacity: 0.85;
}

/* ---------- herramientas de la portada ---------- */
.home-tools { margin: 4px 0 34px; display: flex; flex-direction: column; gap: 16px; }

#buscador {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 99px;
  color: var(--text);
  font-family: var(--font);
  font-size: 1rem;
  padding: 13px 22px;
  outline: none;
  transition: border-color 0.15s;
}

#buscador:focus { border-color: var(--accent); }
#buscador::placeholder { color: var(--text-faint); }

.progreso-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.progreso-info b { color: var(--accent-2); }

.progreso-barra {
  height: 8px;
  border-radius: 99px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  overflow: hidden;
}

.progreso-relleno {
  height: 100%;
  background: var(--grad);
  border-radius: 99px;
  transition: width 0.4s ease;
}

/* ---------- firma del autor ---------- */
.byline {
  margin-top: 26px;
  margin-bottom: 4px;
  font-size: 0.85rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.firma-img {
  height: 42px;
  width: auto;
  display: inline-block;
}

.firma-link { display: inline-block; transition: transform 0.15s ease, filter 0.15s ease; }
.firma-link:hover { transform: scale(1.04); filter: brightness(1.15); }

footer .firma { display: block; margin-bottom: 10px; }
.firma-pie { height: 26px; opacity: 0.9; }

/* ---------- sobre el autor ---------- */
.autor {
  display: flex;
  gap: 32px;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin: 64px auto;
}

.autor-foto {
  width: 230px;
  height: 230px;
  object-fit: cover;
  object-position: top;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.autor-eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-faint);
  margin-bottom: 10px;
}

.firma-autor { height: 34px; margin-bottom: 14px; }

.autor-texto p:not(.autor-eyebrow) { color: var(--text-dim); }

.autor .btn { text-decoration: none; display: inline-block; margin-top: 6px; }
.autor .btn:hover { text-decoration: none; }

@media (max-width: 620px) {
  .autor { flex-direction: column; text-align: center; }
  .autor-foto { width: 150px; height: 150px; }
  .firma-autor { margin-left: auto; margin-right: auto; display: block; }
}

/* ---------- bandas de newsletter y Pro ---------- */
.banda-news, .banda-pro {
  display: flex;
  gap: 26px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.banda-news h2, .banda-pro h2 { margin-bottom: 6px; }
.banda-news > div, .banda-pro > div { flex: 1 1 320px; }
.banda-news p, .banda-pro p { margin-bottom: 0; }

.banda-pro {
  background: linear-gradient(135deg, rgba(108,140,255,0.10), rgba(63,208,201,0.10));
}

.form-news {
  display: flex;
  gap: 10px;
  flex: 1 1 300px;
  max-width: 420px;
}

.form-news input { flex: 1; min-width: 0; }
.banda-pro .btn { text-decoration: none; white-space: normal; text-align: center; }

/* ---------- botón de tema ---------- */
.toggle-idioma {
  position: fixed;
  right: 16px;
  bottom: 72px;
  z-index: 50;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card-hover);
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(0,0,0,0.35);
}

.toggle-idioma:hover { border-color: var(--accent); text-decoration: none; }

.toggle-tema {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 50;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  font-size: 1.25rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.35);
}

.lesson-card.soon .name::after {
  content: " · próximamente";
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-faint);
}

/* ---------- pie ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 20px 40px;
  text-align: center;
  color: var(--text-faint);
  font-size: 0.85rem;
  margin-top: 60px;
}

/* ---------- utilidades ---------- */
.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.85rem;
  border-radius: 6px;
  padding: 2px 8px;
  margin: 2px;
  border: 1px solid transparent;
}

.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.spread { justify-content: space-between; }
.center { text-align: center; }
.mt { margin-top: 18px; }
.stat {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--text-dim);
}
.stat b { color: var(--accent-2); font-size: 1.1rem; }

@media (max-width: 560px) {
  .sim { padding: 14px; }
  .lesson-nav a { max-width: 100%; }
  .controls { gap: 12px; }
  .block-tag { white-space: normal; text-align: right; max-width: 60vw; }
}