:root {
  --paper: #f2efe7;
  --ink: #1c2430;
  --muted: #3e4a55;
  --line: #d0c8b8;
  --sea: #1b4f5c;
  --brass: #8d6234;
  --rust: #8e4634;
  --card: #faf8f4;
  --sans: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --serif: "Iowan Old Style", Palatino, "Palatino Linotype", Georgia, serif;
  --mono: ui-monospace, "Cascadia Mono", "Segoe UI Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.55;
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  transform: translateY(-150%);
  background: var(--card);
  color: var(--ink);
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--sea);
  z-index: 3;
}

.skip:focus { transform: none; }

a { color: var(--sea); }

a:hover { color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--sea);
  outline-offset: 2px;
}

.site-header,
.site-footer,
main {
  width: min(72rem, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem 2rem;
  flex-wrap: wrap;
  padding: 1.25rem 0 1rem;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.wordmark:hover { color: var(--sea); }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  font-family: var(--sans);
  font-size: 0.95rem;
}

nav a {
  color: var(--ink);
  text-decoration: none;
}

nav a:hover { color: var(--sea); }

nav a[aria-current="page"] {
  color: var(--sea);
  text-decoration: underline;
  text-underline-offset: 0.28em;
}

main { padding: 1.75rem 0 3rem; }

h1 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
}

h3 { margin: 0; }

.lede,
.prose { max-width: 40rem; }

.lede { margin: 0 0 1.25rem; font-size: 1.2rem; }

.prose p,
.prose li { margin: 0.55rem 0; }

.prose ul { padding-left: 1.2rem; }

code {
  font-family: var(--mono);
  font-size: 0.86em;
}

.tool-list {
  display: grid;
  gap: 0.85rem;
  margin: 1.5rem 0 0.5rem;
}

.tool-card {
  display: block;
  padding: 1.1rem 1.25rem 1.2rem;
  background: var(--card);
  border: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
}

.tool-card:hover { border-color: var(--sea); }

.tool-card h2 {
  margin: 0 0 0.35rem;
  font-size: 1.45rem;
}

.tool-card p {
  margin: 0;
  color: var(--muted);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(16rem, 22rem) minmax(0, 1fr);
  gap: 1.25rem 1.5rem;
  align-items: start;
  margin-top: 1.25rem;
}

.controls {
  display: grid;
  gap: 0.85rem;
}

.control,
.fieldset-label,
.control-note,
legend,
.presets,
.result-card h3,
.result-card dt,
.sub,
.figure-note,
.legend,
.summary,
.message,
.site-footer,
nav,
button,
input,
output {
  font-family: var(--sans);
}

.control {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.92rem;
  color: var(--muted);
}

.control input,
fieldset {
  font-size: 1rem;
  color: var(--ink);
}

input[type="number"],
input[type="range"],
input[type="date"] {
  width: 100%;
  accent-color: var(--sea);
}

input[type="number"],
input[type="date"],
select {
  font: inherit;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--line);
  background: white;
  border-radius: 0;
}

input[type="date"] {
  min-width: 0;
}

.summary .date-readout {
  display: block;
  margin-top: 0.35rem;
}

select { width: 100%; }

fieldset {
  margin: 0;
  padding: 0.55rem 0.75rem 0.7rem;
  border: 1px solid var(--line);
  display: grid;
  gap: 0.35rem;
}

legend {
  padding: 0 0.3rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.choice {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.95rem;
}

fieldset.refraction .choice {
  align-items: flex-start;
}

fieldset.refraction .choice input {
  flex: none;
  margin-top: 0.28rem;
}

.control-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.35;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.9rem;
}

button {
  font: inherit;
  font-size: 0.85rem;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 0.35rem 0.6rem;
  cursor: pointer;
}

button:hover { border-color: var(--sea); color: var(--sea); }

.message {
  margin: 1rem 0 0;
  padding: 0.6rem 0.75rem;
  background: #f6efe6;
  border: 1px solid var(--brass);
}

.summary {
  margin: 1rem 0 0;
  min-height: 1.4em;
}

.stack { display: grid; gap: 0.85rem; }

.figure-panel {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 0.75rem 0.75rem 0.9rem;
}

.ballistic-figure {
  margin: 0;
}

.figure-panel svg {
  width: 100%;
  height: auto;
  display: block;
  background: var(--card);
}

.figure-note,
.legend {
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  padding: 0;
  list-style: none;
}

.legend span {
  display: inline-block;
  width: 0.85rem;
  height: 0.85rem;
  margin-right: 0.35rem;
  vertical-align: -0.1rem;
  border: 1px solid var(--line);
}

.swatch-sea { background: var(--sea); }
.swatch-brass { background: var(--brass); }
.swatch-rust { background: var(--rust); }
.swatch-muted { background: var(--muted); }

.results {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 1.1rem;
}

.result-card {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 0.9rem 1rem 0.4rem;
}

.result-card h3 {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--sea);
  margin-bottom: 0.8rem;
}

.result-card.plane h3 { color: var(--muted); }

.result-card dl { margin: 0; }

.result-card dt {
  font-size: 0.82rem;
  color: var(--muted);
}

.result-card dd {
  margin: 0.1rem 0 0.85rem;
}

.primary {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  font-size: 1.25rem;
}

.sub {
  display: block;
  margin-top: 0.1rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  min-height: 1.1em;
}

.compare-figs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.compare-figs figure { margin: 0; }

.compare-figs figcaption {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

.zoom-readout {
  margin: 0.7rem 0 0;
  font-family: var(--sans);
  font-size: 0.95rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1rem 0 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer p { margin: 0; }

.site-footer p + p { margin-top: 0.35rem; }

.map-frame {
  height: 28rem;
  background: var(--card);
  border: 1px solid var(--line);
}

.map-frame.compact {
  height: 18rem;
  margin-top: 1.25rem;
}

.map-frame .leaflet-container {
  height: 100%;
  width: 100%;
  background: var(--card);
  font-family: var(--sans);
}

.pin { background: none; border: none; }

.pin-dot {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sea);
  border: 2px solid var(--card);
}

.pin-selected .pin-dot {
  width: 14px;
  height: 14px;
  background: var(--ink);
}

.pin-observed .pin-dot,
.pin-aim .pin-dot { background: var(--brass); }

.pin-ship .pin-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background:
    linear-gradient(var(--sea), var(--sea)) center / 2px 10px no-repeat,
    linear-gradient(var(--sea), var(--sea)) center / 10px 2px no-repeat,
    var(--card);
  border: 2px solid var(--sea);
}

.pin-fall .pin-dot {
  background: var(--rust);
  border-radius: 0;
  transform: rotate(45deg);
}

.pin-fall .pin-label {
  top: -1.55rem;
  font-weight: 600;
}

.pin-short .pin-dot {
  width: 12px;
  height: 12px;
  background: var(--ink);
  border-radius: 2px;
}

.pin-short .pin-label {
  top: 1.05rem;
  left: -0.15rem;
  font-weight: 600;
}

.pin-label {
  position: absolute;
  left: 16px;
  top: -4px;
  white-space: nowrap;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink);
  background: color-mix(in srgb, var(--card) 88%, transparent);
  padding: 0 0.2rem;
}

.readout dl {
  display: grid;
  grid-template-columns: minmax(10rem, 16rem) minmax(0, 1fr);
  gap: 0.35rem 1rem;
  margin: 0.5rem 0 0;
}

.readout dt {
  margin: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.92rem;
}

.readout dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
}

.table-wrap { overflow-x: auto; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 0.45rem 0.55rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.data-table th {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--sea);
  font-weight: 600;
}

button[aria-pressed="true"] {
  border-color: var(--sea);
  color: var(--sea);
}

@media (max-width: 860px) {
  .map-frame { height: 22rem; }
  .readout dl { grid-template-columns: 1fr; }
}

.home-figure {
  margin: 1.5rem 0 0;
  max-width: 40rem;
}

.home-figure svg { width: 100%; height: auto; display: block; }

.home-figure figcaption {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

@media (max-width: 860px) {
  .workspace,
  .results,
  .compare-figs { grid-template-columns: 1fr; }
}

@media print {
  .site-header nav,
  .presets,
  .skip { display: none; }
  body { background: white; }
  .result-card,
  .figure-panel,
  .tool-card { break-inside: avoid; }
}