:root{
  --bg: #0a0d1a;
  --bg-deep: #060811;
  --panel: #11162a;
  --ink: #e7e3d3;
  --muted: #9aa0b4;
  --line: #262c4d;
  --gold: #c9a869;
  --violet: #7a6ea3;

  --mercury: #9c9186;
  --venus: #d8c093;
  --earth: #4f7f74;
  --mars: #a1543a;
  --jupiter: #b79569;
  --saturn: #c9b384;
  --uranus: #7fa6a3;
  --neptune: #45579e;

  --display: Georgia, 'Iowan Old Style', 'Palatino Linotype', 'Book Antiqua', serif;
  --data: ui-monospace, 'SF Mono', 'Courier New', Courier, monospace;
}

*{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background:
    radial-gradient(ellipse at 20% 0%, #10152b 0%, transparent 55%),
    radial-gradient(ellipse at 85% 30%, #0d1224 0%, transparent 50%),
    var(--bg);
  color: var(--ink);
  font-family: var(--display);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* estrellas de fondo, generadas en CSS, sin imágenes */
.starfield{
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(1px 1px at 10% 20%, #ffffff55 50%, transparent 51%),
    radial-gradient(1px 1px at 25% 65%, #ffffff40 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 40% 10%, #ffffff60 50%, transparent 51%),
    radial-gradient(1px 1px at 60% 80%, #ffffff35 50%, transparent 51%),
    radial-gradient(1px 1px at 75% 35%, #ffffff55 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 90% 60%, #ffffff45 50%, transparent 51%),
    radial-gradient(1px 1px at 15% 90%, #ffffff40 50%, transparent 51%),
    radial-gradient(1px 1px at 50% 45%, #ffffff30 50%, transparent 51%);
  background-repeat: repeat;
  background-size: 600px 600px;
  opacity: 0.8;
}

.wrap{
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px 120px;
}

/* ---------- Cabecera / diagrama orbital ---------- */
header.atlas-header{
  padding: 72px 0 32px;
  text-align: center;
}

.orbit-diagram{
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 0 auto 28px;
  display: block;
}

.orbit-diagram circle.ring{
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
}

.orbit-diagram .body{
  transform-origin: 210px 210px;
}

@media (prefers-reduced-motion: no-preference){
  .orbit-diagram .body{ animation: orbit linear infinite; }
  .orbit-diagram .b1{ animation-duration: 6s;  animation-delay: -2.7s; }
  .orbit-diagram .b2{ animation-duration: 10s; animation-delay: -6.3s; }
  .orbit-diagram .b3{ animation-duration: 15s; animation-delay: -1.4s; }
  .orbit-diagram .b4{ animation-duration: 21s; animation-delay: -13.8s; }
  .orbit-diagram .b5{ animation-duration: 32s; animation-delay: -22.5s; }
}

@keyframes orbit{
  from{ transform: rotate(0deg); }
  to{ transform: rotate(360deg); }
}

.eyebrow{
  font-family: var(--data);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--gold);
}

h1{
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 500;
  margin: 10px 0 6px;
  letter-spacing: 0.01em;
}

.subtitle{
  color: var(--muted);
  font-size: 15px;
  max-width: 520px;
  margin: 0 auto;
}

/* ---------- Introducción ---------- */
.intro{
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 28px 0;
  color: var(--muted);
  font-size: 16px;
}

.intro p{ margin: 0 0 12px; }
.intro p:last-child{ margin-bottom: 0; }

/* ---------- Índice (home -> cada cuerpo celeste) ---------- */
.index-list{
  display: flex;
  flex-direction: column;
  margin-top: 4px;
}

.index-list a{
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: baseline;
  gap: 18px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
}

.index-list a:first-child{ border-top: 1px solid var(--line); }

.index-list a:hover .idx-name,
.index-list a:focus-visible .idx-name{
  color: var(--gold);
}

.index-list a:focus-visible{
  outline: 1px solid var(--gold);
  outline-offset: 2px;
}

.idx-no{
  font-family: var(--data);
  font-size: 12px;
  color: var(--muted);
}

.idx-name{
  font-size: 18px;
}

.idx-note{
  font-family: var(--data);
  font-size: 12px;
  color: var(--muted);
  text-align: right;
}

/* ---------- Página individual de un cuerpo celeste ---------- */
.wrap-single{
  padding-top: 56px;
}

.back-link{
  display: inline-block;
  font-family: var(--data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  margin-bottom: 40px;
}

.back-link:hover,
.back-link:focus-visible{ color: var(--gold); }

.plate-single{
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  align-items: start;
  border-bottom: none;
  padding: 0;
}

.plate-single h1{
  font-size: 30px;
  font-weight: 500;
  margin: 4px 0 16px;
}

.plate-single p{
  font-size: 16px;
  margin: 0 0 22px;
}

.pager{
  display: flex;
  justify-content: space-between;
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--data);
  font-size: 13px;
}

.pager a{
  color: var(--muted);
  text-decoration: none;
}

.pager a:hover,
.pager a:focus-visible{ color: var(--gold); }

@media (max-width: 560px){
  .plate-single{
    grid-template-columns: 1fr;
  }
  .plate-single .plate-figure img{
    max-width: 200px;
  }
  .index-list a{
    grid-template-columns: 30px 1fr;
  }
  .idx-note{ display: none; }
}

.plate-figure{
  position: relative;
}

.plate-figure img{
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--line);
  display: block;
  filter: saturate(0.92) contrast(1.02);
}

.plate-figure .swatch{
  position: absolute;
  bottom: -8px;
  left: -8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--bg);
}

.plate-number{
  font-family: var(--data);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.plate h2{
  font-size: 24px;
  font-weight: 500;
  margin: 4px 0 12px;
}

.plate-body p{
  color: var(--ink);
  font-size: 15.5px;
  margin: 0 0 16px;
}

.data-table{
  width: 100%;
  border-collapse: collapse;
  font-family: var(--data);
  font-size: 13px;
  color: var(--muted);
}

.data-table td{
  padding: 5px 0;
  border-top: 1px dotted var(--line);
}

.data-table td:first-child{
  color: var(--gold);
  width: 46%;
}

.data-table td:last-child{
  text-align: right;
  color: var(--ink);
}

/* ---------- Cierre ---------- */
.closing{
  padding-top: 44px;
  color: var(--muted);
  font-size: 15px;
  font-style: italic;
  text-align: center;
}

footer.mark{
  text-align: center;
  color: var(--line);
  font-family: var(--data);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding-top: 40px;
}