/* ============================================================
   El Linaje Humano · estilos
   Paleta: vacío azul-negro + espina de hueso/marfil + color por género
   ============================================================ */

:root {
  /* Fondo */
  --void: #07090f;
  --void-2: #0b0e18;
  --nebula-1: #15103a;   /* indigo */
  --nebula-2: #0c2330;   /* teal apagado */

  /* Hueso / texto */
  --bone: #efe6cf;       /* espina y titulares */
  --bone-soft: #cbc3ad;
  --text: #f2ede0;
  --muted: #8d8676;
  --muted-2: #5f5a4f;

  /* Color por linaje (género) */
  --c-basal:   #c08a5e;  /* barro / tierra */
  --c-austro:  #7fae5a;  /* sabana */
  --c-paranth: #a667e0;  /* robustos */
  --c-homo-e:  #54a8e0;  /* Homo temprano */
  --c-homo-a:  #e8696f;  /* Homo arcaico/reciente */

  --card-bg: rgba(16, 19, 30, 0.72);
  --card-border: rgba(239, 230, 207, 0.14);

  --font-display: "Fraunces", Georgia, serif;
  --font-ui: "Space Grotesk", system-ui, sans-serif;

  --spine-x: 50%;
  --maxw: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 700px at 18% 8%, var(--nebula-1) 0%, transparent 60%),
    radial-gradient(1000px 800px at 85% 75%, var(--nebula-2) 0%, transparent 55%),
    linear-gradient(180deg, var(--void) 0%, var(--void-2) 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-ui);
  line-height: 1.5;
  overflow-x: hidden;
}

em { font-style: italic; }

/* ---------- Campo de estrellas ---------- */
.starfield {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.star {
  position: absolute;
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: #fff;
  opacity: 0.6;
  animation: twinkle var(--tw, 4s) ease-in-out infinite;
  animation-delay: var(--td, 0s);
}
@keyframes twinkle {
  0%, 100% { opacity: 0.12; }
  50%      { opacity: 0.85; }
}

/* ---------- HUD ---------- */
.hud {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding: 14px clamp(16px, 4vw, 40px);
  background: linear-gradient(180deg, rgba(7, 9, 15, 0.92) 0%, rgba(7, 9, 15, 0) 100%);
  backdrop-filter: blur(2px);
}
.hud__brand {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--bone-soft);
}
.hud__time {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.1;
  text-align: center;
}
.hud__stage {
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--accent, var(--muted));
  transition: color 0.4s ease;
}
.hud__era {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 600;
  color: var(--bone);
  font-variant-numeric: tabular-nums;
}
.hud__rail {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 520px;
  margin: 8px auto 0;
  width: 100%;
}
.hud__rail-label {
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--muted-2);
  white-space: nowrap;
}
.hud__track {
  flex: 1;
  height: 2px;
  background: rgba(239, 230, 207, 0.14);
  border-radius: 2px;
  overflow: hidden;
}
.hud__fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--c-basal), var(--bone));
  transition: width 0.2s linear;
}
.hud__audio {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--card-border);
  background: rgba(16, 19, 30, 0.6);
  color: var(--bone-soft);
  font-family: var(--font-ui);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease;
}
.hud__audio:hover { border-color: var(--bone); color: var(--bone); }
.hud__audio[aria-pressed="true"] {
  border-color: var(--c-homo-e);
  color: var(--c-homo-e);
}
.hud__audio-icon { font-size: 0.95rem; }

/* ---------- Portada / cierre ---------- */
.intro, .outro {
  position: relative;
  z-index: 2;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 clamp(20px, 6vw, 40px);
  text-align: center;
}
.intro {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.intro__eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 22px;
}
.intro__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.6rem, 9vw, 5.4rem);
  line-height: 0.98;
  margin: 0 0 26px;
  color: var(--bone);
}
.intro__title em { color: var(--c-austro); }
.intro__lead {
  max-width: 540px;
  color: var(--bone-soft);
  font-size: clamp(1rem, 2.4vw, 1.15rem);
  margin: 0 auto;
}
.intro__cue {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}
.intro__arrow { font-size: 1.4rem; animation: bob 1.8s ease-in-out infinite; }
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(8px); } }

.outro {
  min-height: 70svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.outro__line {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.8rem, 5vw, 3rem);
  color: var(--bone);
  margin: 0 0 18px;
}
.outro__note {
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 560px;
  margin: 0 auto;
}
.outro__note em { color: var(--bone-soft); }

/* ---------- Línea de tiempo / espina ---------- */
.timeline {
  position: relative;
  z-index: 2;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 80px 0 120px;
}
.spine {
  position: absolute;
  top: 0; bottom: 0;
  left: var(--spine-x);
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(
    180deg,
    transparent 0%,
    var(--c-basal) 6%,
    var(--bone) 50%,
    var(--c-homo-a) 94%,
    transparent 100%
  );
  box-shadow: 0 0 14px rgba(239, 230, 207, 0.35);
}

/* ---------- Nodo de especie ---------- */
.node {
  position: relative;
  width: 50%;
  padding: 26px clamp(24px, 5vw, 56px);
  margin: 8px 0;
}
.node--left  { margin-right: auto; text-align: right; }
.node--right { margin-left: auto;  text-align: left; }

/* Conector hacia la espina + punto */
.node::before { /* línea */
  content: "";
  position: absolute;
  top: 56px;
  width: clamp(24px, 5vw, 56px);
  height: 1px;
  background: var(--accent, var(--bone-soft));
  opacity: 0.5;
}
.node::after { /* punto en la espina */
  content: "";
  position: absolute;
  top: 51px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--accent, var(--bone));
  box-shadow: 0 0 12px var(--accent, var(--bone));
}
.node--left::before  { right: 0; }
.node--left::after   { right: -6px; }
.node--right::before { left: 0; }
.node--right::after  { left: -6px; }

/* ---------- Tarjeta ---------- */
.card {
  display: inline-flex;
  gap: 18px;
  align-items: center;
  max-width: 440px;
  padding: 18px 20px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-left: 3px solid var(--accent, var(--bone));
  border-radius: 14px;
  backdrop-filter: blur(6px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  text-align: left;
}
.node--left .card { flex-direction: row-reverse; text-align: right; }

/* Medallón placeholder (gris, sustituible por foto en assets/<slug>.jpg) */
.card__specimen {
  position: relative;            /* ancla para la foto: la mantiene dentro del círculo */
  flex: 0 0 auto;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, #4a4a4a 0%, #2c2c2c 70%);
  border: 2px solid var(--accent, var(--bone));
  display: grid;
  place-items: center;
  color: var(--bone-soft);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.4rem;
  overflow: hidden;
  box-shadow: inset 0 0 12px rgba(0,0,0,0.6);
}
/* La foto rellena el círculo sin deformarse y conserva el aro de color */
.card__specimen .card__photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}

.card__body { min-width: 0; }
.card__name {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 600;
  font-size: 1.12rem;
  color: var(--text);
  margin: 0 0 6px;
  line-height: 1.15;
}
.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 4px;
}
.node--left .card__meta { justify-content: flex-end; }
.card__era {
  color: var(--accent, var(--bone));
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}
.card__site::before { content: "📍"; margin-right: 4px; opacity: 0.7; filter: grayscale(1); }
.card__note {
  font-size: 0.78rem;
  color: var(--muted-2);
  font-style: italic;
  margin: 2px 0 0;
}

/* Estado oculto antes de la animación (solo si hay JS y no reduce-motion) */
.js .node--anim { opacity: 0; }

/* ---------- Responsive: una sola columna ---------- */
@media (max-width: 720px) {
  :root { --spine-x: 28px; }
  .timeline { padding-top: 40px; }
  .node, .node--left, .node--right {
    width: 100%;
    text-align: left;
    padding-left: 52px;
    padding-right: 16px;
    margin-left: 0;
    margin-right: 0;
  }
  .node--left .card,
  .node--right .card { flex-direction: row; text-align: left; }
  .node--left .card__meta { justify-content: flex-start; }
  .node::before { left: 28px; right: auto; width: 24px; }
  .node::after  { left: 22px; right: auto; }
  .card { max-width: 100%; }
  .hud { grid-template-columns: 1fr auto; }
  .hud__brand { display: none; }
}

/* ---------- Accesibilidad ---------- */
.hud__audio:focus-visible,
a:focus-visible { outline: 2px solid var(--c-homo-e); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .star, .intro__arrow { animation: none; }
  .js .node--anim { opacity: 1 !important; transform: none !important; }
}

/* ---------- Créditos de imágenes (pie del recorrido) ---------- */
.credits {
  max-width: 820px;
  margin: 0 auto;
  padding: 56px 24px 80px;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.82rem;
  line-height: 1.6;
  border-top: 1px solid var(--card-border);
}
.credits h2 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--bone);
  margin: 0 0 6px;
}
.credits__intro { color: var(--muted-2); margin: 0 0 22px; }
.credits__group {
  font-family: var(--font-ui);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.66rem;
  color: var(--bone-soft);
  margin: 22px 0 8px;
}
.credits ul { list-style: none; margin: 0; padding: 0; }
.credits li { margin: 0 0 7px; }
.credits em { color: var(--bone-soft); font-style: italic; }
.credits a { color: var(--bone-soft); text-decoration: underline; text-underline-offset: 2px; }
.credits a:hover { color: var(--bone); }
.credits__copyright {
  margin: 40px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--card-border);
  text-align: center;
  font-size: 0.74rem;
  color: var(--muted-2);
}