:root {
  color-scheme: dark;
  --ink: #eaf0f2;
  --muted: #82909a;
  --faint: #53616b;
  --line: #24323c;
  --panel: #0c1720;
  --panel-2: #101d27;
  --background: #081018;
  --accent: #f0bd57;
  --signal: #80d9d3;
  --max: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  background: var(--background);
  color: var(--ink);
  font-family: "Segoe UI", Inter, system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

button, input { font: inherit; }

button { color: inherit; }

.page-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .32;
  background-image:
    linear-gradient(rgba(128,217,211,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(128,217,211,.035) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(to bottom, black, transparent 70%);
}

.topbar, main, footer {
  position: relative;
  width: min(calc(100% - 48px), var(--max));
  margin-inline: auto;
}

.topbar {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 14px;
  font-weight: 650;
  letter-spacing: .03em;
}

.brand-mark {
  width: 30px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1px solid var(--signal);
  border-radius: 50%;
}

.brand-mark i {
  display: block;
  width: 1px;
  height: 20px;
  background: var(--accent);
  transform: rotate(18deg);
}

.clocks { display: flex; gap: 24px; color: var(--muted); font-variant-numeric: tabular-nums; }
.clocks span { display: flex; gap: 8px; }
.clocks b { color: var(--faint); font-size: .75rem; letter-spacing: .12em; align-self: center; }

main { padding: 44px 0 24px; }

.intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: 24px 48px;
  margin-bottom: 44px;
}

.eyebrow, .section-index, .output-label {
  margin: 0;
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.intro .eyebrow { grid-column: 1 / -1; }

h1 {
  margin: 0;
  max-width: 700px;
  font-size: clamp(3.2rem, 6vw, 5.8rem);
  line-height: .86;
  letter-spacing: -.075em;
  font-weight: 650;
}

.lede {
  margin: 0 0 6px;
  max-width: 480px;
  color: #b6c1c7;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.instrument {
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(16,29,39,.96), rgba(9,18,26,.98));
  box-shadow: 0 32px 90px rgba(0,0,0,.26);
}

.instrument-head, .input-grid, .output, .presets {
  padding: 28px 32px;
  border-bottom: 1px solid var(--line);
}

.instrument-head { display: flex; align-items: start; justify-content: space-between; }

h2, h3 { margin: 0; }
h2 { font-size: clamp(1.45rem, 3vw, 2rem); letter-spacing: -.035em; }
.section-index { margin-bottom: 7px; color: var(--signal); }

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--signal);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.status::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.status.error { color: #ff8f7c; }

.input-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

label { display: grid; grid-template-columns: 1fr auto; gap: 7px 16px; color: var(--muted); }
label span { font-weight: 600; color: #c4ced3; }
label small { color: var(--faint); align-self: center; }

input {
  grid-column: 1 / -1;
  width: 100%;
  border: 0;
  border-bottom: 1px solid #41515d;
  border-radius: 0;
  padding: 12px 0 14px;
  background: transparent;
  color: var(--ink);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-variant-numeric: tabular-nums;
  outline: none;
  transition: border-color .2s ease, background .2s ease;
}

input:focus { border-color: var(--signal); background: rgba(128,217,211,.035); }
input[aria-invalid="true"] { border-color: #ff8f7c; }

.output { padding-block: 40px; }
.output-label { color: var(--muted); margin-bottom: 15px; }

.coordinate {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  border: 0;
  padding: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: clamp(1.35rem, 4vw, 3.1rem);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.04em;
}

.coordinate:hover #dms-output, .coordinate:focus-visible #dms-output { color: var(--signal); }
.coordinate:focus-visible { outline: 2px solid var(--signal); outline-offset: 8px; }
.copy-hint { color: var(--faint); font-size: .7rem; letter-spacing: .12em; }
.decimal { margin: 12px 0 0; color: var(--accent); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; }

.presets { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; border-bottom: 0; }
.presets > span { margin-right: auto; color: var(--muted); }
.presets button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
  background: transparent;
  color: #b8c3c8;
  cursor: pointer;
}
.presets button:hover, .presets button:focus-visible { border-color: var(--signal); color: var(--signal); outline: none; }

.notes { padding: 96px 0 72px; display: grid; grid-template-columns: .7fr 2fr; gap: 64px; }
.note-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.note-grid article { min-height: 220px; padding: 26px; background: var(--background); }
.note-grid span { color: var(--signal); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: .72rem; letter-spacing: .12em; }
.note-grid h3 { margin-top: 38px; font-size: 1.1rem; }
.note-grid p { margin: 10px 0 0; color: var(--muted); }

footer {
  padding: 26px 0 40px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: .78rem;
}
footer p { margin: 0; }

@media (max-width: 800px) {
  .topbar { min-height: 78px; }
  .clocks span:last-child { display: none; }
  main { padding-top: 42px; }
  .intro { grid-template-columns: 1fr; gap: 28px; margin-bottom: 48px; }
  .input-grid, .notes { grid-template-columns: 1fr; }
  .note-grid { grid-template-columns: 1fr; }
  .note-grid article { min-height: auto; }
  .note-grid h3 { margin-top: 18px; }
}

@media (max-width: 520px) {
  .topbar, main, footer { width: min(calc(100% - 28px), var(--max)); }
  .brand { gap: 9px; font-size: .92rem; }
  .brand-mark { width: 25px; }
  .clocks { font-size: .84rem; }
  .instrument-head, .input-grid, .output, .presets { padding-inline: 20px; }
  .coordinate { align-items: end; }
  .copy-hint { display: none; }
  .presets > span { width: 100%; }
  .notes { padding-top: 72px; gap: 28px; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}