/*
 * Palette and layout.
 *
 * viz.js emits SVG with semantic class names and never sets a colour itself,
 * so every fill and stroke for both visualisations is defined here alongside
 * the rest of the theme.
 */

:root {
  --bg: #0b0f1a;
  --bg-panel: #141b2d;
  --bg-inset: #1c2540;
  --border: #273353;
  --text: #e8edf7;
  --text-dim: #96a3c0;
  --accent: #ffb547;
  --accent-soft: #ffd694;
  --moon: #dfe6f5;
  --earth: #4f9de0;

  --brick-top: #ffc65c;
  --brick-right: #d98f24;
  --brick-left: #a86a14;
  --stud-top: #ffd689;
  --stud-side: #e0a337;

  --radius: 14px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 1.25rem 4rem;
  background: radial-gradient(circle at 15% -10%, #1b2748 0%, var(--bg) 55%);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.masthead {
  max-width: 1120px;
  margin: 0 auto;
  padding: 3rem 0 2rem;
}

.masthead h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.25rem);
  letter-spacing: -0.02em;
  background: linear-gradient(100deg, var(--accent) 10%, var(--moon) 75%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  margin: 0.5rem 0 0;
  color: var(--text-dim);
  max-width: 52ch;
}

main {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  gap: 1.25rem;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.panel h2 {
  margin: 0 0 1rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-dim);
  font-weight: 600;
}

/* ---- Controls ---- */

.controls {
  display: grid;
  gap: 1.35rem;
  align-content: start;
}

.field {
  display: grid;
  gap: 0.5rem;
  border: 0;
  padding: 0;
  margin: 0;
  min-width: 0;
}

.field > label,
.field legend {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-dim);
  font-weight: 600;
  padding: 0;
}

select {
  width: 100%;
  padding: 0.7rem 0.85rem;
  background: var(--bg-inset);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 9px;
  font: inherit;
  font-size: 0.95rem;
}

select:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.orientation-options {
  display: grid;
  gap: 0.6rem;
}

.orientation {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.8rem 0.9rem;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.orientation:hover {
  border-color: #3a4a75;
}

.orientation:has(input:checked) {
  border-color: var(--accent);
  background: #242c42;
}

.orientation input {
  margin-top: 0.3rem;
  accent-color: var(--accent);
}

.orientation-body {
  display: grid;
  gap: 0.15rem;
}

.orientation-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.orientation-blurb {
  color: var(--text-dim);
  font-size: 0.83rem;
  line-height: 1.4;
}

.orientation-pitch {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent-soft);
}

.checkbox {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  font-size: 0.92rem;
  cursor: pointer;
  text-transform: none;
  letter-spacing: normal;
  color: var(--text);
  font-weight: 400;
}

.checkbox input {
  accent-color: var(--accent);
  width: 1rem;
  height: 1rem;
}

/* A gap that does not apply on this axis stays visible but recedes. */
#gap-row.is-inert {
  opacity: 0.55;
}

.note {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.note:empty {
  display: none;
}

/* ---- Headline ---- */

.headline {
  display: grid;
  align-content: start;
  gap: 0.35rem;
}

.headline-label {
  margin: 0;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-dim);
  font-weight: 600;
}

.headline-count {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(1.6rem, 4.4vw, 2.9rem);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  overflow-wrap: anywhere;
}

.headline-words {
  margin: 0 0 1rem;
  color: var(--text-dim);
}

.headline-words strong {
  color: var(--text);
}

.stats {
  margin: 0;
  display: grid;
  gap: 0.1rem;
  border-top: 1px solid var(--border);
}

.stats > div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
}

.stats dt {
  color: var(--text-dim);
  font-size: 0.88rem;
}

.stats dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.9rem;
  text-align: right;
  overflow-wrap: anywhere;
}

/* ---- Brick diagram ---- */

#brick-diagram {
  width: 100%;
  height: 260px;
  display: block;
}

.face {
  stroke: #6b4a10;
  stroke-width: 1;
  stroke-linejoin: round;
}

.face-top {
  fill: var(--brick-top);
}

.face-right {
  fill: var(--brick-right);
}

.face-left {
  fill: var(--brick-left);
}

.stud-side {
  fill: var(--stud-side);
}

.stud-top {
  fill: var(--stud-top);
  stroke: #6b4a10;
  stroke-width: 1;
}

.axis-arrow line {
  stroke: var(--moon);
  stroke-width: 2;
  stroke-dasharray: 6 5;
  stroke-linecap: round;
}

.arrow-head {
  fill: var(--moon);
  stroke: none;
}

.caption {
  margin: 0.75rem 0 0;
  color: var(--text-dim);
  font-size: 0.86rem;
}

/* ---- Ladder ---- */

.ladder-panel {
  grid-column: 1 / -1;
}

#ladder {
  width: 100%;
  height: auto;
  display: block;
}

.ladder-axis {
  stroke-width: 3;
  stroke-linecap: round;
}

.grad-earth {
  stop-color: var(--earth);
}

.grad-moon {
  stop-color: var(--moon);
}

.rung-tick {
  stroke: var(--border);
  stroke-width: 2;
}

.rung-name {
  fill: var(--text-dim);
  font-family: var(--font);
  font-size: 14px;
}

.rung-count {
  fill: var(--text);
  font-family: var(--mono);
  font-size: 15px;
}

.rung-alt {
  fill: var(--text-dim);
  font-family: var(--font);
  font-size: 11.5px;
}

.rung-goal .rung-name,
.rung-goal .rung-count {
  fill: var(--accent);
  font-weight: 700;
}

.rung-goal .rung-tick {
  stroke: var(--accent);
}

.ladder-caption {
  fill: var(--text-dim);
  font-family: var(--font);
  font-size: 12px;
}

/* ---- Colophon ---- */

.colophon {
  max-width: 1120px;
  margin: 2.5rem auto 0;
  color: var(--text-dim);
  font-size: 0.86rem;
}

.colophon h2 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}

.colophon ul {
  margin: 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.4rem;
  max-width: 78ch;
}

@media (max-width: 860px) {
  main {
    grid-template-columns: minmax(0, 1fr);
  }
}