/* =====================================================
   Tema local — Feynman & Gell-Mann (modo escuro aprimorado)
   ===================================================== */

:root {
  --bg-dark: #0e1117;
  --panel-dark: #171c24;
  --text-light: #e9eef7;
  --muted: #b8c1d4;

  --feynman-gold: #f5b642;    /* calor babilônico */
  --gellmann-blue: #4fa3f7;   /* razão grega */
  --accent-purple: #a66ef5;   /* equilíbrio final */
}

/* plano de fundo e texto */
body {
  background-color: var(--bg-dark);
  color: var(--text-light);
  font-family: "Fira Sans", "Segoe UI", sans-serif;
  line-height: 1.6;
}

/* títulos */
h1, h2, h3 {
  font-weight: 600;
  letter-spacing: 0.02em;
  text-shadow: 0 0 4px rgba(255, 255, 255, 0.05);
}

h1 {
  color: var(--feynman-gold);
}

h2 {
  color: var(--gellmann-blue);
}

h3 {
  color: var(--muted);
}

/* callouts */
.callout-tip {
  border-left: 4px solid var(--feynman-gold);
  background-color: rgba(245, 182, 66, 0.08);
}

.callout-note {
  border-left: 4px solid var(--gellmann-blue);
  background-color: rgba(79, 163, 247, 0.08);
}

.callout-important {
  border-left: 4px solid var(--accent-purple);
  background-color: rgba(166, 110, 245, 0.1);
  font-style: italic;
}

/* tabela comparativa */
table {
  border-collapse: collapse;
  margin: 1.5em auto;
  width: 90%;
}

th, td {
  border: 1px solid #2a2f3a;
  padding: 0.6em 1em;
}

th {
  background-color: var(--panel-dark);
  color: var(--feynman-gold);
}

td {
  background-color: rgba(255, 255, 255, 0.02);
}

/* links */
a {
  color: var(--gellmann-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  color: var(--feynman-gold);
}

/* gradiente sutil no topo */
.quarto-title-block {
  background: linear-gradient(
    to right,
    rgba(245, 182, 66, 0.15),
    rgba(79, 163, 247, 0.15)
  );
  border-radius: 12px;
  padding: 1.5em;
  margin-bottom: 1.5em;
}

/* =====================================================
   Harmonização do rodapé global (tema dark)
   ===================================================== */

.page-footer {
  background-color: #0e1117 !important;
  color: #b8c1d4 !important;
  border-top: 1px solid #252a33;
  padding: 1em 0;
}

.page-footer a {
  color: #4fa3f7 !important; /* azul grego */
  text-decoration: none;
  transition: color 0.3s ease;
}

.page-footer a:hover {
  color: #f5b642 !important; /* dourado babilônico */
}

/* centraliza e suaviza o texto */
.page-footer .footer-content {
  text-align: center;
  font-size: 0.9em;
  opacity: 0.9;
}