:root {
  --cyan-deep: #0c2a5e;
  --cyanotype: #16418a;
  --cyan-line: #3a69b3;
  --cyan-pale: #9cc4e8;
  --paper: #f2f5ee;
  --lamp: #f0cf6a;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--paper);
  background-color: var(--cyanotype);
  /* Cyanotype blueprint grid */
  background-image:
    linear-gradient(var(--cyan-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--cyan-line) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: -1px -1px;
}

body::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 35%, rgba(22, 65, 138, 0.2), var(--cyanotype) 75%);
  pointer-events: none;
}

main {
  position: relative;
  max-width: 1040px;
  margin: 0 auto;
  padding: 48px 24px 32px;
}

header h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.5rem;
  letter-spacing: 0.01em;
}

header p {
  margin: 4px 0 0;
  color: var(--cyan-pale);
  max-width: 52ch;
}

.stage {
  display: grid;
  grid-template-columns: minmax(260px, 440px) 1fr;
  gap: 56px;
  align-items: center;
  margin-top: 40px;
}

.moonwrap {
  position: relative;
  aspect-ratio: 1;
  width: 100%;
}

.halo {
  position: absolute;
  inset: -12%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(240, 207, 106, 0.55) 0%, rgba(240, 207, 106, 0) 65%);
  opacity: var(--glow, 0.3);
  transition: opacity 0.25s ease;
}

#moon {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
}

.readout .when {
  margin: 0;
  color: var(--cyan-pale);
}

.readout h2 {
  margin: 4px 0 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.05;
}

.readout .lit {
  margin: 8px 0 0;
  font-family: var(--serif);
  font-size: 1.6rem;
  color: var(--lamp);
}

dl {
  margin: 32px 0 0;
  display: grid;
  gap: 0;
  max-width: 420px;
}

dl > div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-top: 1px solid var(--cyan-line);
}

dl > div:last-child { border-bottom: 1px solid var(--cyan-line); }
dt { color: var(--cyan-pale); }
dd { margin: 0; text-align: right; }

button#today {
  margin-top: 24px;
  padding: 10px 18px;
  font: inherit;
  color: var(--cyan-deep);
  background: var(--lamp);
  border: 0;
  border-radius: 999px;
  cursor: pointer;
}

button#today:hover { background: #f6dc88; }

.scrub { margin-top: 48px; }

input[type="range"] {
  width: 100%;
  accent-color: var(--lamp);
  height: 28px;
  cursor: grab;
}

#strip {
  display: grid;
  grid-template-columns: repeat(30, 1fr);
  gap: 2px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

#strip li { display: contents; }

#strip button {
  display: block;
  width: 100%;
  padding: 3px 0;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  cursor: pointer;
}

#strip button svg { display: block; width: 100%; height: auto; }
#strip button[aria-current="true"] { border-bottom-color: var(--lamp); }
#strip button.today-marker { border-bottom-color: var(--cyan-pale); }
#strip button[aria-current="true"].today-marker { border-bottom-color: var(--lamp); }

.hint {
  margin: 12px 0 0;
  color: var(--cyan-pale);
  font-size: 0.9rem;
}

footer {
  margin-top: 56px;
  color: var(--cyan-pale);
  font-size: 0.85rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

:focus-visible {
  outline: 3px solid var(--lamp);
  outline-offset: 3px;
}

@media (max-width: 760px) {
  main { padding-top: 32px; }
  .stage { grid-template-columns: 1fr; gap: 32px; }
  .moonwrap { max-width: 340px; }
  #strip { gap: 1px; }
}

@media (prefers-reduced-motion: reduce) {
  .halo { transition: none; }
}