/* Neural Network Training Labs — sitio de estudio */
:root {
  --bg: #0d1117; --bg-soft: #131a24; --card: #161f2e; --line: #263041;
  --ink: #e6edf3; --ink-soft: #9fb0c3; --muted: #6b7d92;
  --accent: #7c5cff; --accent-soft: #9d86ff; --green: #2e8b57; --gold: #f0b429;
  --radius: 14px; --radius-sm: 9px;
  --shadow: 0 2px 10px rgba(0,0,0,0.35); --shadow-h: 0 8px 26px rgba(124,92,255,0.28);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fb; --bg-soft: #eef1f7; --card: #ffffff; --line: #e2e6ee;
    --ink: #1a2233; --ink-soft: #48566b; --muted: #7a889c;
    --shadow: 0 2px 10px rgba(20,30,50,0.08); --shadow-h: 0 10px 28px rgba(124,92,255,0.20);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font-family: 'Inter', system-ui, sans-serif; line-height: 1.65; }

.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 26px; background: color-mix(in srgb, var(--bg-soft) 88%, transparent);
  border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 50; backdrop-filter: blur(10px); }
.brand { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 1.02rem;
  color: var(--ink); text-decoration: none; }
.crumbs { font-size: 0.9rem; color: var(--ink-soft); }
.crumbs a { color: var(--accent-soft); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }
.crumbs .sep { margin: 0 8px; opacity: 0.4; }

.prose { max-width: 900px; margin: 0 auto; padding: 34px 26px 72px; }

/* Portada */
.home-hero { text-align: center; padding: 30px 0 14px; }
.home-kicker { display: inline-block; font-family: 'JetBrains Mono', monospace; font-size: 0.82rem;
  color: var(--accent-soft); background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 34%, transparent);
  padding: 5px 14px; border-radius: 999px; letter-spacing: 0.02em; }
.home-hero h1 { font-family: 'Space Grotesk', sans-serif; font-size: clamp(1.9rem, 4.6vw, 2.9rem);
  line-height: 1.14; margin: 18px 0 10px; letter-spacing: -0.02em;
  background: linear-gradient(120deg, var(--ink), var(--accent-soft));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { max-width: 680px; margin: 0 auto; color: var(--ink-soft); font-size: 1.08rem; }
.home-actions, .lab-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; margin: 24px 0 8px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 20px; border-radius: 999px;
  background: var(--accent); color: #fff; font-weight: 600; text-decoration: none; font-size: 0.95rem;
  box-shadow: var(--shadow); transition: transform 0.15s, box-shadow 0.15s; }
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-h); }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); box-shadow: none; }
.btn-ghost:hover { border-color: var(--accent); }

.home-sec { font-family: 'Space Grotesk', sans-serif; font-size: 1.35rem; margin: 44px 0 18px;
  display: flex; align-items: center; gap: 12px; }
.home-sec .count { font-size: 0.8rem; font-weight: 600; color: var(--accent-soft);
  background: color-mix(in srgb, var(--accent) 15%, transparent); padding: 2px 11px; border-radius: 999px; }
.lab-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.lab-card { display: flex; flex-direction: column; gap: 6px; padding: 16px 18px; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; color: var(--ink);
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s; box-shadow: var(--shadow); }
.lab-card:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: var(--shadow-h); }
.lab-num { font-family: 'JetBrains Mono', monospace; font-size: 0.82rem; color: var(--accent-soft); font-weight: 600; }
.lab-name { font-weight: 600; font-size: 1.0rem; line-height: 1.3; }

/* Página de laboratorio */
.lab-hero { padding: 8px 0 6px; }
.lab-kicker { font-family: 'JetBrains Mono', monospace; font-size: 0.82rem; color: var(--accent-soft);
  text-transform: uppercase; letter-spacing: 0.05em; }
.lab-hero h1 { font-family: 'Space Grotesk', sans-serif; font-size: clamp(1.7rem, 3.8vw, 2.4rem);
  line-height: 1.16; margin: 8px 0 16px; letter-spacing: -0.01em; }
.lab-actions { justify-content: flex-start; margin: 0 0 6px; }

/* Paginador anterior / siguiente */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 22px 0; }
.pg { display: flex; flex-direction: column; gap: 4px; padding: 14px 18px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--line); text-decoration: none; color: var(--ink);
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s; box-shadow: var(--shadow); }
.pg-next { text-align: right; }
.pg:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-h); }
.pg-empty { background: transparent; border: none; box-shadow: none; }
.pg-dir { font-size: 0.8rem; color: var(--accent-soft); font-weight: 600; }
.pg-title { font-weight: 600; font-size: 0.98rem; }

/* Contenido renderizado */
.content { margin-top: 8px; }
.content h1 { display: none; } /* el título ya está en el hero */
.doc-sep { font-family: 'Space Grotesk', sans-serif; margin: 2.4em 0 0.6em; padding-top: 1.2em;
  border-top: 2px solid var(--line); font-size: 1.5rem; color: var(--accent-soft); }
.content h2 { font-family: 'Space Grotesk', sans-serif; font-size: 1.4rem; margin: 1.8em 0 0.5em;
  padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.content h3 { font-size: 1.14rem; margin: 1.5em 0 0.4em; }
.content p, .content li { color: var(--ink-soft); }
.content a { color: var(--accent-soft); text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent); text-underline-offset: 3px; }
.content a:hover { text-decoration-color: var(--accent); }
.content code { font-family: 'JetBrains Mono', monospace; font-size: 0.88em;
  background: var(--bg-soft); border: 1px solid var(--line); padding: 1px 6px; border-radius: 5px; color: var(--ink); }
.content pre { background: #0b1220; color: #d7e0ee; padding: 16px 18px; border-radius: var(--radius-sm);
  overflow-x: auto; border: 1px solid var(--line); box-shadow: var(--shadow); }
.content pre code { background: transparent; border: none; padding: 0; color: inherit; }
.content blockquote { border-left: 4px solid var(--accent); background: var(--bg-soft);
  padding: 12px 18px; margin: 1.4em 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--ink); }
.content table { border-collapse: collapse; width: 100%; margin: 1.4em 0; background: var(--card);
  border-radius: var(--radius-sm); overflow: hidden; box-shadow: var(--shadow); display: block; overflow-x: auto; }
.content th, .content td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); }
.content th { background: color-mix(in srgb, var(--accent) 20%, var(--card)); color: var(--ink); font-weight: 600; }
.content tr:last-child td { border-bottom: none; }
.content img { max-width: 100%; height: auto; border-radius: var(--radius-sm); }
.content hr { border: none; border-top: 1px solid var(--line); margin: 2.2em 0; }

.foot { max-width: 900px; margin: 0 auto; padding: 26px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 0.88rem; text-align: center; }
.foot a { color: var(--accent-soft); text-decoration: none; }
.foot code { font-family: 'JetBrains Mono', monospace; }

@media (max-width: 620px) {
  .pager { grid-template-columns: 1fr; }
  .pg-next { text-align: left; }
}