/* Shared layout: colours, header, workspace, controls, buttons, dialogs, and the drawing room. */
:root {
  color-scheme: dark;
  --bg: #101217;
  --panel: #191c23;
  --line: #30343c;
  --ink: #f1f2ed;
  --muted: #a6abb5;
  --lime: #ddf6a3;
  --stage: #0a0e15;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font:
    16px/1.5 system-ui,
    -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    sans-serif;
}
button,
input,
select {
  font: inherit;
}
button {
  cursor: pointer;
  color: inherit;
}
button:focus-visible,
input:focus-visible,
select:focus-visible,
canvas:focus-visible,
summary:focus-visible,
a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 5px;
}
button {
  touch-action: manipulation;
}
button:disabled {
  opacity: 0.45;
  cursor: default;
}
button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}
header {
  height: 88px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--line);
  gap: 20px;
}
.shell {
  width: min(1440px, calc(100% - 80px));
  margin: auto;
}
.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 23px;
  letter-spacing: -1px;
  font-weight: 600;
}
.brand svg {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: var(--lime);
  stroke-width: 1;
}
.edition {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.08em;
}
.quiet {
  background: none;
  border: none;
  padding: 9px 0;
  color: var(--muted);
  font-size: 14px;
}
.quiet:hover {
  color: var(--ink);
}
.intro {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  padding: 28px 0 24px;
}
/* Headings receive focus only programmatically (after navigating), so they need no ring. */
h1[tabindex='-1']:focus {
  outline: none;
}
h1 {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 44px;
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -1.4px;
  margin: 0 0 8px;
}
.intro p {
  margin: 0;
  color: var(--muted);
}
.pill {
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 8px 13px;
  font-size: 13px;
  color: var(--muted);
  white-space: nowrap;
}
.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 324px;
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  background: var(--panel);
}
.drawing {
  /* A column: title and readout, the picture (taking the rest), then the buttons. Nothing overlaps when text wraps. */
  position: relative;
  min-height: 574px;
  background: var(--stage);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 24px 23px;
}
.stage-head {
  position: relative;
  z-index: 2;
  padding: 0 1px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  pointer-events: none;
}
.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
}
#pattern-name {
  font-family: Georgia, serif;
  font-size: 22px;
  margin-top: 2px;
}
#cycle-status {
  font-size: 12px;
  color: #8795a8;
  text-align: right;
  max-width: 145px;
  padding-top: 4px;
}
.canvas-wrap {
  position: relative;
  flex: 1 1 0;
  min-height: 220px;
  margin: 0 -6px;
}
.canvas-wrap > canvas {
  position: absolute;
  inset: 0;
}
#art {
  display: block;
  width: 100%;
  height: 100%;
}
.transport {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--line);
  background: #20242c;
  border-radius: 9px;
  padding: 10px 13px;
  font-size: 14px;
  min-height: 43px;
  transition:
    background 0.15s,
    border-color 0.15s;
}
.button:hover {
  background: #2a303b;
  border-color: #616872;
}
.primary {
  background: var(--lime);
  color: #192014;
  border-color: var(--lime);
  font-weight: 600;
}
.primary:hover {
  background: #ecffc6;
  border-color: #ecffc6;
}
.icon-button {
  padding: 10px;
  min-width: 43px;
}
.transport .end {
  margin-left: auto;
}
.controls {
  padding: 24px;
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 23px;
}
.panel-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 6px 10px;
}
.panel-head h2 {
  white-space: nowrap;
  font-size: 18px;
  font-weight: 500;
  margin: 0;
  letter-spacing: -0.3px;
}
.control label {
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.number-wrap {
  display: flex;
  align-items: center;
  gap: 3px;
  color: var(--lime);
  font-size: 14px;
}
.number-wrap input {
  width: 70px;
  min-width: 0;
  color: var(--lime);
  background: #11161d;
  border: 1px solid #424b59;
  border-radius: 5px;
  padding: 3px 5px;
  font-size: 14px;
  text-align: right;
}
.control output {
  font-variant-numeric: tabular-nums;
  color: var(--lime);
  font-size: 14px;
}
.control p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.45;
  margin: 4px 0 0;
}
.control input[type='range'] {
  width: 100%;
  accent-color: var(--lime);
  margin: 15px 0 4px;
  height: 6px;
  cursor: pointer;
  display: block;
}
.split-labels {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #969da9;
  margin-top: 9px;
}
.palettes {
  display: flex;
  gap: 10px;
  margin-top: 11px;
}
.swatch {
  width: 38px;
  height: 38px;
  border: 3px solid var(--panel);
  outline: 1px solid #444b57;
  border-radius: 50%;
  position: relative;
}
.swatch[aria-pressed='true'] {
  outline: 2px solid var(--ink);
}
.swatch[aria-pressed='true']::after {
  content: '✓';
  color: #0c1320;
  font-size: 18px;
  position: absolute;
  inset: 1px;
  text-align: center;
  text-shadow: 0 0 4px #fff;
}
.toggle {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 14px;
  cursor: pointer;
}
.toggle input {
  width: 18px;
  height: 18px;
  accent-color: var(--lime);
  margin: 0;
}
.separator {
  height: 1px;
  background: var(--line);
  margin: -1px 0;
}
.hint {
  margin-top: auto;
  font-size: 14px;
  color: #c4c9d1;
  border-left: 2px solid #677d4b;
  padding-left: 12px;
}
.hint strong {
  color: var(--lime);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 5px;
}
.why {
  width: 100%;
  justify-content: space-between;
  background: transparent;
}
.presets-header {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
  justify-content: space-between;
  margin: 26px 0 13px;
}
.presets-header h2 {
  font-size: 15px;
  font-weight: 500;
  margin: 0;
}
.preset-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
}
.preset {
  background: #16191f;
  border: 1px solid var(--line);
  border-radius: 13px;
  padding: 10px 12px 12px;
  text-align: left;
  transition:
    background 0.15s,
    border-color 0.15s;
  min-width: 0;
}
.preset:hover {
  background: #20242c;
  border-color: #737c89;
}
.preset[aria-pressed='true'] {
  border-color: var(--lime);
  background: #1e2520;
}
.preset canvas {
  width: 100%;
  height: 80px;
  display: block;
  margin-bottom: 7px;
}
.preset-name {
  display: block;
  font-size: 14px;
}
.preset-note {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}
footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
  padding: 26px 0 30px;
  color: var(--muted);
  font-size: 13px;
}
footer p {
  margin: 0;
}
.footer-credit .quiet {
  font-size: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.footer-note {
  font-family: Georgia, serif;
  font-style: italic;
  font-size: 16px;
  color: #c6cbbd;
}
dialog {
  color: var(--ink);
  background: #191d26;
  border: 1px solid #434b59;
  border-radius: 18px;
  max-width: 600px;
  width: calc(100% - 32px);
  max-height: 88dvh;
  padding: 28px;
  box-shadow: 0 30px 100px #0009;
}
dialog::backdrop {
  background: #050a12ba;
  backdrop-filter: blur(8px);
}
.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}
dialog h2 {
  font:
    400 30px/1.2 Georgia,
    serif;
  margin: 0;
}
dialog p {
  color: #c9ced7;
  line-height: 1.65;
}
dialog h3 {
  font-size: 16px;
  font-weight: 500;
  color: var(--lime);
  margin: 25px 0 7px;
}
.idea-card {
  padding: 17px 20px;
  background: #111720;
  border-radius: 10px;
  border: 1px solid #313b4b;
  margin: 18px 0;
}
.idea-card p {
  margin: 0;
}
.idea-card .formula {
  font-family: ui-monospace, monospace;
  font-size: 14px;
  overflow-wrap: anywhere;
  margin-top: 12px;
  color: var(--lime);
}
details {
  border-top: 1px solid #39414e;
  padding-top: 16px;
  margin-top: 24px;
}
summary {
  cursor: pointer;
  color: var(--ink);
  font-size: 14px;
}
dialog .button {
  margin-top: 8px;
}
.text-area {
  width: 100%;
  background: #10151e;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  font:
    14px/1.5 ui-monospace,
    monospace;
}
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--lime);
  color: #172011;
  padding: 12px 20px;
  border-radius: 10px;
  box-shadow: 0 8px 30px #0006;
  z-index: 8;
  max-width: calc(100% - 32px);
  font-size: 14px;
  text-align: center;
}
.toast:empty {
  display: none;
}
.mobile-only {
  display: none;
}
.speed-row {
  display: flex;
  gap: 6px;
}
.speed-row button {
  background: transparent;
  border: 1px solid var(--line);
  padding: 4px 9px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 12px;
}
.speed-row button[aria-pressed='true'] {
  color: var(--lime);
  border-color: #70834e;
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.focus-mode .controls,
.focus-mode .intro,
.focus-mode .presets-header,
.focus-mode .preset-grid,
.focus-mode footer {
  display: none;
}
.focus-mode .workspace {
  grid-template-columns: 1fr;
  margin-top: 20px;
}
.focus-mode .drawing {
  height: calc(100dvh - 140px);
  min-height: 420px;
}
@media (min-width: 1500px) {
  .drawing {
    min-height: 650px;
  }
  .preset canvas {
    height: 90px;
  }
}
@media (max-width: 1050px) {
  .shell {
    width: calc(100% - 40px);
  }
  .workspace {
    grid-template-columns: minmax(0, 1fr) 296px;
  }
  .controls {
    padding: 20px;
    gap: 20px;
  }
  .drawing {
    min-height: 570px;
  }
  .preset-grid {
    gap: 8px;
  }
  .preset {
    padding: 9px;
  }
  .preset-note {
    font-size: 12px;
  }
  .drawing {
    padding-inline: 16px;
  }
  .transport .button {
    padding: 9px 10px;
  }
}
/* Below this the controls move under the picture, in two columns. */
@media (max-width: 960px) {
  .workspace {
    grid-template-columns: minmax(0, 1fr);
  }
  .drawing {
    /* Grows with its content, so wrapped buttons stay inside. */
    min-height: clamp(440px, 57svh, 590px);
  }
  .controls {
    border-left: 0;
    border-top: 1px solid var(--line);
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 25px 22px;
    padding: 20px;
  }
  .panel-head,
  .hint,
  .why {
    grid-column: 1/-1;
  }
  .separator {
    display: none;
  }
  .hint {
    margin: 0;
  }
}
@media (max-width: 760px) {
  .shell {
    width: calc(100% - 28px);
  }
  header {
    height: 69px;
  }
  .brand {
    font-size: 21px;
  }
  .edition {
    display: none;
  }
  .intro {
    padding: 22px 0 18px;
    align-items: start;
  }
  h1 {
    font-size: 35px;
  }
  .intro p {
    font-size: 14px;
    max-width: 280px;
  }
  .pill {
    display: none;
  }
  .drawing {
    padding: 18px 20px 16px;
  }
  .canvas-wrap {
    margin: 0 -10px;
  }
  /* On a phone: sliders get the full width, and the nudge comes right after the heading. */
  .controls .control:has(input[type='range']) {
    grid-column: 1/-1;
  }
  .controls .panel-head {
    order: -2;
  }
  .controls .hint {
    order: -1;
  }
  .transport {
    gap: 6px;
  }
  .transport .button {
    font-size: 13px;
    padding: 9px 10px;
  }
  .controls .control p {
    font-size: 12px;
  }
  .preset-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 9px;
  }
  .preset canvas {
    height: 75px;
  }
  .presets-header {
    margin-top: 22px;
  }
  .preset-note {
    font-size: 12px;
  }
  footer {
    align-items: start;
  }
  .footer-note {
    max-width: 180px;
    font-size: 15px;
  }
  dialog {
    padding: 22px;
  }
  /* On a phone the close button stays in reach while a long explanation scrolls. */
  dialog .dialog-head {
    position: sticky;
    top: -22px;
    z-index: 3;
    margin: -22px -22px 16px;
    padding: 16px 22px 12px;
    background: #191d26;
    border-bottom: 1px solid #2b313c;
  }
  .focus-mode .drawing {
    height: calc(100svh - 112px);
  }
}
@media (max-width: 380px) {
  .transport .button {
    font-size: 12px;
    padding: 8px;
  }
  .drawing {
    padding-inline: 12px;
  }
  .controls {
    gap: 22px 14px;
  }
  .swatch {
    width: 31px;
    height: 31px;
  }
  .palettes {
    gap: 8px;
  }
  .intro p {
    font-size: 13px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}

/* Small print in the About dialog. */
.about-small {
  font-size: 13px;
  color: var(--muted) !important;
}
dialog a {
  color: #b9d797;
}

/* Skip link: hidden until focused. */
.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 20;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--lime);
  color: #172011;
  font-weight: 600;
}
.skip-link:focus {
  top: 12px;
}