:root {
  --space: #0b0d12;      /* near-black of space and the unlit side of Mercury */
  --ash: #e9e6df;        /* regolith / bone white */
  --dusk: #8b8d93;       /* secondary text */
  --sunrise: #e8a33d;    /* the sun at the terminator */
  --terrarium: #4f9a5f;  /* the green of Terminator and the terraria */
}

* { box-sizing: border-box; }

html, body { height: 100%; margin: 0; }

body {
  background: var(--space);
  color: var(--ash);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.mark { width: 120px; height: 120px; margin-bottom: 32px; }
.disc-dark  { fill: #151821; }
.disc-light { fill: var(--ash); }
.ring       { fill: none; stroke: var(--ash); stroke-width: 1.5; }
.line       { stroke: var(--sunrise); stroke-width: 1.5; }
.green      { fill: var(--terrarium); }

h1 {
  margin: 0 0 12px;
  font-weight: 300;
  font-size: clamp(2rem, 6vw, 3.25rem);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  padding-left: 0.28em; /* offsets trailing letter-spacing so the title centers */
}

.tag {
  margin: 0;
  color: var(--dusk);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}