/* ============================================================
   Curso: microgpt — Construye un GPT desde cero
   Acento: #06b6d4 (cyan — síntesis, culminación, claridad)
   ============================================================ */
:root {
  --bg:       #0f1117;
  --panel:    #1a1d28;
  --panel-2:  #232735;
  --border:   #2d3346;
  --text:     #e4e6ed;
  --text-dim: #9098ad;
  --accent:   #06b6d4;   /* cyan primario — forward pass */
  --accent-2: #67e8f9;   /* cyan claro */
  --green:    #34d399;   /* pérdida baja, correcto */
  --purple:   #a78bfa;   /* atención, Q/K/V */
  --yellow:   #fbbf24;   /* valores intermedios */
  --rose:     #fb7185;   /* gradientes, backward */
  --orange:   #fb923c;   /* warnings */
  --code-bg:  #0a0c12;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 32px 80px;
}

/* ── Header ── */
header {
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.step-tag {
  display: inline-block;
  background: var(--accent);
  color: #0f1117;
  padding: 4px 14px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

h1 { font-size: 30px; margin: 8px 0 6px; }
h2 {
  font-size: 22px;
  margin-top: 48px;
  color: var(--text);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 6px;
  display: inline-block;
}
h3 { font-size: 17px; margin-top: 28px; color: var(--accent-2); }

.subtitle { color: var(--text-dim); font-size: 17px; max-width: 780px; }

p { font-size: 15.5px; color: var(--text); line-height: 1.65; }

/* ── Paneles ── */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 22px;
  margin: 16px 0;
}

.key-insight {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 15px;
}

.warn {
  background: color-mix(in srgb, var(--yellow) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--yellow) 30%, transparent);
  border-left: 4px solid var(--yellow);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 15px;
}

.analogy {
  background: color-mix(in srgb, var(--green) 8%, transparent);
  border-left: 3px solid var(--green);
  border-radius: 4px;
  padding: 12px 16px;
  margin: 16px 0;
  font-size: 15px;
}

/* ── Cálculos a mano ── */
.bymano {
  background: color-mix(in srgb, var(--purple) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--purple) 25%, transparent);
  border-left: 4px solid var(--purple);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 20px 0;
}

.bymano-label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  color: var(--purple);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 10px;
}

.bymano pre {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text);
  overflow-x: auto;
  white-space: pre-wrap;
}

/* ── Código ── */
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  font-family: "JetBrains Mono", "Consolas", monospace;
  font-size: 13.5px;
  line-height: 1.6;
  margin: 12px 0;
}

code {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  color: var(--accent);
}

pre code { background: none; border: none; padding: 0; color: inherit; }

/* Coloreado de sintaxis */
.kw  { color: #c792ea; }
.str { color: #c3e88d; }
.num { color: #f78c6c; }
.com { color: #546e7a; font-style: italic; }
.fn  { color: #82aaff; }

/* ── Fórmulas ── */
.formula {
  font-family: "JetBrains Mono", monospace;
  font-size: 17px;
  text-align: center;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 16px 0;
  color: var(--accent);
}

/* ── Tablas ── */
table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14.5px; }
th {
  background: var(--panel-2);
  color: var(--text-dim);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 2px solid var(--border);
}
td { padding: 10px 14px; border-bottom: 1px solid var(--border); color: var(--text); }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--panel-2); }

/* ── Demo interactiva ── */
.demo {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin: 20px 0;
}

.slider-row {
  display: grid;
  grid-template-columns: 160px 1fr 70px;
  gap: 12px;
  align-items: center;
  margin: 10px 0;
}
.slider-row label { font-size: 14px; color: var(--text-dim); }
.slider-row input[type="range"] { width: 100%; accent-color: var(--accent); }
.val { font-family: "JetBrains Mono", monospace; font-size: 14px; color: var(--accent); font-weight: 700; }

.demo-result {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin-top: 14px;
  font-family: "JetBrains Mono", monospace;
  font-size: 13.5px;
  line-height: 1.7;
}

/* ── Botones ── */
.btn {
  background: var(--accent);
  color: #0f1117;
  border: none;
  border-radius: 8px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: opacity 0.15s;
  margin: 6px 4px 6px 0;
}
.btn:hover { opacity: 0.85; }
.btn.secondary {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn.secondary:hover { background: var(--panel); }

/* ── Visualizaciones ── */
.viz-wrap { margin: 20px 0; }
.viz-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  margin-bottom: 8px;
}
.viz-caption {
  font-size: 13.5px;
  color: var(--text-dim);
  margin-top: 8px;
  text-align: center;
  font-style: italic;
}

/* ── Resaltados semánticos ── */
.hi-cyan   { color: var(--accent); font-weight: 700; }
.hi-rose   { color: var(--rose); font-weight: 700; }
.hi-green  { color: var(--green); font-weight: 700; }
.hi-yellow { color: var(--yellow); font-weight: 700; }
.hi-purple { color: var(--purple); font-weight: 700; }
.num       { color: var(--accent); font-weight: 700; }

/* ── Navegación entre lecciones ── */
.nav-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 14px;
}
.nav-footer a { color: var(--accent); text-decoration: none; }
.nav-footer a:hover { text-decoration: underline; }
.nav-footer span { color: var(--text-dim); }

/* ── Grid de 2 columnas ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 16px 0; }
@media (max-width: 720px) { .grid-2 { grid-template-columns: 1fr; } }

/* ── Pasos numerados para demos step-by-step ── */
.step-pills { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0; }
.step-pill {
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.15s;
}
.step-pill.active {
  background: color-mix(in srgb, var(--accent) 20%, transparent);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Canvas contenedor ── */
canvas {
  display: block;
  border-radius: 8px;
  background: var(--code-bg);
  max-width: 100%;
}

/* ── Portada ── */
.portada-hero {
  padding: 32px 0 28px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}
.portada-eyebrow {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
}
.portada-hero h1 { font-size: 34px; margin: 0 0 12px; }
.portada-lead { font-size: 17px; color: var(--text-dim); max-width: 680px; margin: 0 0 20px; }
.portada-meta { display: flex; gap: 10px; flex-wrap: wrap; margin: 16px 0; }
.portada-chip {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 14px;
  font-size: 13px;
}
.portada-promise {
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 15px;
  max-width: 680px;
  margin-top: 20px;
}
.portada-section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin: 32px 0 16px;
  border: none;
  padding: 0;
  display: block;
}
.portada-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 32px; }
@media (max-width: 700px) { .portada-grid { grid-template-columns: 1fr; } }
.portada-lesson {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.15s;
}
.portada-lesson:hover {
  background: var(--panel-2);
  border-color: var(--accent);
  transform: translateY(-1px);
}
.portada-lesson-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  min-width: 32px;
}
.portada-lesson-body { flex: 1; }
.portada-lesson-body h3 {
  font-size: 14px;
  font-weight: 700;
  margin: 0 0 3px;
  color: var(--text);
}
.portada-lesson-body p {
  font-size: 12px;
  color: var(--text-dim);
  margin: 0;
  line-height: 1.4;
}
.portada-lesson-go { color: var(--accent); font-size: 18px; }
.portada-cta { text-align: center; margin: 32px 0; }
.portada-cta-btn {
  display: inline-block;
  background: var(--accent);
  color: #0f1117;
  font-weight: 700;
  font-size: 16px;
  padding: 14px 32px;
  border-radius: 10px;
  text-decoration: none;
  transition: opacity 0.15s;
}
.portada-cta-btn:hover { opacity: 0.85; }
.portada-prereq {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  margin-bottom: 24px;
}
.portada-prereq h2 { font-size: 15px; margin: 0 0 10px; border: none; padding: 0; display: block; color: var(--text-dim); }
.portada-footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); text-align: center; }
.portada-brand { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--text-dim); font-size: 14px; }
.portada-brand:hover { color: var(--text); }
.back-home {
  display: inline-block;
  color: var(--text-dim);
  font-size: 13px;
  text-decoration: none;
  margin-bottom: 20px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: color 0.15s;
}
.back-home:hover { color: var(--accent); border-color: var(--accent); }

/* ── Heatmap para tabla bigram ── */
.heatmap-cell {
  display: inline-block;
  width: 22px; height: 22px;
  border-radius: 3px;
  transition: background 0.2s;
}

/* ── Barras de probabilidad ── */
.prob-bar-wrap { margin: 4px 0; display: flex; align-items: center; gap: 8px; }
.prob-bar-label { font-family: "JetBrains Mono", monospace; font-size: 13px; color: var(--text-dim); min-width: 24px; }
.prob-bar-track { flex: 1; background: var(--panel-2); border-radius: 4px; height: 16px; overflow: hidden; }
.prob-bar-fill { height: 100%; background: var(--accent); border-radius: 4px; transition: width 0.3s; }
.prob-bar-val { font-family: "JetBrains Mono", monospace; font-size: 12px; color: var(--accent); min-width: 44px; text-align: right; }

/* ── Grafo computacional ── */
.graph-node {
  fill: var(--panel-2);
  stroke: var(--accent);
  stroke-width: 2;
}
.graph-edge { stroke: var(--border); stroke-width: 1.5; fill: none; }
.graph-label { font-family: "JetBrains Mono", monospace; font-size: 12px; fill: var(--text); }

/* ── Mobile ── */
@media (max-width: 640px) {
  .container { padding: 16px 16px 60px; }
  h1 { font-size: 24px; }
  h2 { font-size: 19px; }
  .slider-row { grid-template-columns: 1fr; }
  .portada-hero h1 { font-size: 26px; }
}