/* ============================================================
   Curso: Del gigante al útil — Fine-tuning y modelos eficientes
   Acento: #34d399 (esmeralda — eficiencia, crecimiento, lean)
   ============================================================ */
:root {
  --bg: #0f1117;
  --panel: #1a1d28;
  --panel-2: #232735;
  --border: #2d3346;
  --text: #e4e6ed;
  --text-dim: #9098ad;
  --accent: #34d399;          /* esmeralda (primario) */
  --accent-2: #6ee7b7;        /* esmeralda claro */
  --blue: #7c9eff;
  --purple: #a78bfa;
  --yellow: #fbbf24;
  --orange: #fb923c;
  --pink: #f472b6;
  --red: #f87171;
  --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(--blue) 8%, transparent);
  border-left: 3px solid var(--blue);
  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: 1.7;
  color: var(--text);
  overflow-x: auto;
}

/* ── 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; }

/* Output real */
.out {
  background: #070a0f;
  border: 1px solid #1a2a1a;
  border-left: 4px solid var(--accent);
  border-radius: 0 0 8px 8px;
  margin-top: -4px;
  padding: 12px 16px;
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  color: var(--accent-2);
  line-height: 1.6;
}

.out-label {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 6px;
}

/* ── 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: 140px 1fr 60px;
  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;
}

/* ── 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;
}

/* ── Resaltado numérico en bymano ── */
.num { color: var(--accent); font-weight: 700; }

/* ── Navegación ── */
.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; } }

/* ── Chips de metadata ── */
.chip-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 12px 0; }
.chip {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 12px;
  font-size: 13px;
  color: var(--text);
}

/* ── Mobile ── */
@media (max-width: 640px) {
  .container { padding: 16px 16px 60px; }
  h1 { font-size: 24px; }
  h2 { font-size: 19px; }
}