/* =========================================
   VARIABLES GLOBALES
   =========================================
   Los mismos colores y tipografías que uso en mi diario.
   Papel viejo, tinta suave, el azul que destaca.
   Así este proyecto se siente como parte de lo mismo.
========================================= */
:root {
  --paper: #faf7f2;
  --paper-d: #e8e3dc;
  --ink: #1a1a1a;
  --ink-soft: #444;
  --accent: #0056d2;
  --accent-soft: #dce8ff;
  --mono: "Space Mono", monospace;
  --serif: "Libre Baskerville", serif;
  --display: "Playfair Display", serif;
  --sans: "DM Sans", sans-serif;

  --radius: 6px;
  --shadow-soft: 0 4px 12px rgba(0,0,0,0.08);
  --speed: 0.25s;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
}

h1, h2, h3 {
  font-family: var(--display);
  font-weight: 700;
  line-height: 1.2;
}

p, li {
  font-family: var(--sans);
  font-size: 1rem;
}

code {
  font-family: var(--mono);
  background: var(--paper-d);
  padding: 2px 4px;
  border-radius: 4px;
}

/* =========================================
   NAVBAR FIJA A LA IZQUIERDA
 ========================================= */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  height: 100%;
  background: var(--paper);
  border-right: 1px solid var(--paper-d);
  padding: 2rem 1.5rem;
  overflow-y: auto;
  z-index: 100;
}

#navbar header {
  font-family: var(--display);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--accent);
  border-bottom: 2px solid var(--paper-d);
  padding-bottom: 0.5rem;
}

.nav-link {
  display: block;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--paper-d);
  font-family: var(--sans);
  transition: color var(--speed), padding var(--speed);
}

.nav-link:hover {
  color: var(--accent);
  padding-left: 0.5rem;
}

/* El contenido principal se desplaza para dejar sitio a la navbar */
#main-doc {
  margin-left: 280px;
  padding: 2rem 3rem;
  max-width: 900px;
}

/* =========================================
   SECCIONES
 ========================================= */
.main-section {
  margin-bottom: 3rem;
  scroll-margin-top: 1rem;
}

.main-section header {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #3e2c1b;
  border-left: 4px solid var(--accent);
  padding-left: 0.75rem;
  font-family: var(--display);
}

.main-section p {
  margin-bottom: 1rem;
}

/* Código: fondo oscuro para que resalte, como en mi diario */
pre, code:not(:is(pre code)) {
  background: #1a1a1a;
  color: #f5f5f5;
  padding: 1rem;
  border-radius: var(--radius);
  font-family: var(--mono);
  margin: 1rem 0;
  white-space: pre-wrap;
  overflow-x: auto;
  display: block;
}

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

:not(pre) > code {
  background: var(--paper-d);
  color: var(--ink);
  padding: 2px 4px;
  border-radius: 4px;
  font-size: 0.85rem;
}

ul {
  margin: 1rem 0 1rem 2rem;
}

li {
  margin: 0.5rem 0;
}

/* =========================================
   RESPONSIVE
  ========================================= */
@media (max-width: 768px) {
  #navbar {
    position: static;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--paper-d);
    padding: 1rem;
  }

  #main-doc {
    margin-left: 0;
    padding: 1.5rem;
  }

  .nav-link {
    display: inline-block;
    margin-right: 1rem;
    border-bottom: none;
  }
}