body {
  margin: 0;
  padding: 40px;
  font-family: 'Pirata One', serif;
  background-color: #1b1712;
  background-image:
    radial-gradient(circle at center, rgba(255, 220, 150, 0.25), transparent 65%);
  color: #f2e8c9;
}

/* HEADER */
header {
  text-align: center;
  margin-bottom: 60px;
}

h1 {
  font-family: 'Uncial Antiqua', serif;
  font-size: 3em;
  color: #d6b35e;
}

.subtitulo {
  font-style: italic;
  color: #bfa96a;
}

nav a {
  margin: 0 10px;
  color: #d6b35e;
  text-decoration: none;
  border-bottom: 1px dotted #d6b35e;
}

/* BIBLIOTECA */
.biblioteca {
  max-width: 1100px;
  margin: auto;
}

/* ESTANTE */
.estante {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 25px 20px;
  margin-bottom: 70px;

  background: linear-gradient(#3a2d1b, #2a2013);
  border-bottom: 14px solid #1a1208;
  box-shadow: inset 0 -5px 6px rgba(0,0,0,0.7);
}

/* LIBROS (LOMOS) */
.libro {
  writing-mode: vertical-rl;

  height: 220px;
  width: 46px;
  padding: 10px 6px;

  background: #8c6a3f;
  color: #2b1e0f;

  font-family: 'Uncial Antiqua', serif;
  font-size: 1.1em;
  text-align: center;

  cursor: pointer;
  box-shadow: inset -3px 0 5px rgba(0,0,0,0.4);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.libro:hover {
  transform: translateY(-12px);
  box-shadow: 0 12px 15px rgba(0,0,0,0.7);
}

/* VARIACIÓN DE TAMAÑOS */
.libro:nth-child(2) { height: 190px; }
.libro:nth-child(3) { height: 260px; }
.libro:nth-child(5) { height: 180px; }

/* LIBRO FANTASMA */
.libro.fantasma {
  opacity: 0.4;
  filter: grayscale(80%);
}

/* LIBRO ABIERTO */
.libro-abierto {
  display: none;
  max-width: 700px;
  margin: 60px auto;
  background: #f3e8c8;
  color: #3a2d1b;
  padding: 35px;
  border-radius: 8px;
  box-shadow: 0 0 20px rgba(0,0,0,0.6);
}

.libro-abierto h2 {
  font-family: 'Uncial Antiqua', serif;
}

.glosas {
  margin-top: 20px;
  font-style: italic;
  border-left: 4px solid #b89b4f;
  padding-left: 12px;
}

button {
  margin-top: 25px;
  padding: 10px 18px;
  font-family: 'Pirata One', serif;
  background: #7a5d2d;
  color: #f5ecd2;
  border: none;
  cursor: pointer;
}