/* Shared stylesheet for the standalone MRI demo pages.
   Keeps them visually in step with the main site while leaving their
   scripts (canvas drawing, element ids and class toggles) untouched.
   The demos draw on white canvases, so these pages stay light-only. */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Instrument+Sans:wght@400;500&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #f4f2ed;
  --fg: #141413;
  --muted: #6d6b65;
  --faint: #a9a69e;
  --line: rgba(20, 20, 19, 0.13);
  --line-strong: rgba(20, 20, 19, 0.45);
  --accent: #e0472b;
  --serif: 'Instrument Serif', Georgia, serif;
  --sans: 'Instrument Sans', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: light;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  padding: 0;
  max-width: none;
  display: block;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--fg);
  color: var(--bg);
}

a {
  color: inherit;
}

/* Top bar linking back to the site ---------------------------------- */

.demo-nav {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.demo-nav-inner {
  max-width: 78rem;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
  height: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.demo-brand {
  font-family: var(--serif);
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.demo-back {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
}

.demo-back:hover {
  color: var(--accent);
}

/* Page frame ---------------------------------------------------------- */

.container,
.demo-container {
  max-width: 78rem;
  width: auto;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) clamp(1.25rem, 4vw, 3rem) 5rem;
  background: transparent;
  border-radius: 0;
  box-shadow: none;
}

h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.1rem, 5vw, 3.75rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--fg);
  text-align: left;
  margin: 0 0 1rem;
}

.subtitle {
  text-align: left;
  color: var(--muted);
  font-size: 1.15rem;
  margin: 0 0 2rem;
  max-width: 40rem;
}

h2 {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin: 0 0 0.6rem;
}

p {
  margin: 0 0 0.75rem;
}

strong {
  font-weight: 500;
  color: var(--fg);
}

ul {
  padding-left: 1.1rem;
}

li {
  margin: 0.25rem 0;
}

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

.controls {
  background: transparent;
  border-radius: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.25rem 0;
  margin: 1.5rem 0 2rem;
  text-align: left;
}

.control-row {
  margin: 0.6rem 0;
}

.slider-container {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0.4rem 2rem 0.4rem 0;
}

label {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  width: auto;
  text-align: left;
  margin-right: 0.4rem;
}

input[type='range'] {
  accent-color: var(--fg);
  width: 170px;
  vertical-align: middle;
}

input[type='radio'] {
  accent-color: var(--fg);
}

.value-display {
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  color: var(--fg);
  width: auto;
  min-width: 3.5rem;
  margin: 0;
  text-align: left;
}

button {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 0.5rem 1rem;
  margin: 0.25rem 0.35rem 0.25rem 0;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

button:hover:not(:disabled) {
  background: transparent;
  border-color: var(--fg);
  transform: none;
}

button:active {
  background: transparent;
}

button.active,
.mode-buttons button.active,
.gradient-button.active {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
  box-shadow: none;
  transform: none;
}

button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  background: transparent;
}

.mode-buttons button,
.preset-buttons button,
.preset-btn,
.gradient-button {
  background: transparent;
  color: var(--fg);
  font-size: 0.72rem;
  padding: 0.5rem 1rem;
  min-width: 0;
}

.mode-buttons button:hover,
.preset-buttons button:hover,
.preset-btn:hover {
  background: transparent;
}

.mode-buttons,
.preset-buttons {
  margin: 0.6rem 0;
}

/* Primary action in the navigator */
.rf-button {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
  font-size: 0.78rem;
  padding: 0.85rem 1.5rem;
}

.rf-button:hover:not(:disabled) {
  background: transparent;
  color: var(--fg);
  transform: none;
}

.rf-button:disabled {
  background: transparent;
  color: var(--fg);
}

/* Navigator control cluster: RF button, then the two gradient groups side by side */
.demo-container .controls {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
}

.gradient-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.5rem;
  align-items: flex-start;
}

.gradient-group {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.4rem;
}

.gradient-group label {
  color: var(--muted);
  margin: 0;
}

.gradient-buttons {
  display: flex;
  gap: 0.35rem;
}

.timer-display {
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

/* Canvases ------------------------------------------------------------ */

canvas {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto 0.75rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: #fff;
}

.visualization-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2.5rem 2rem;
  margin-top: 2rem;
}

.viz-section {
  text-align: left;
  background: transparent;
  padding: 0;
  border-radius: 0;
}

.viz-section p {
  color: var(--muted);
  font-size: 0.95rem;
}

.kspace-container {
  display: flex;
  justify-content: center;
  margin: 1.5rem 0 2.5rem;
}

.kspace-plot {
  border: 1px solid var(--line);
  background: #0a0a0a;
  margin: 0;
}

.axis-label {
  position: absolute;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--muted);
}

.kx-label {
  bottom: -1.6rem;
  left: 50%;
  transform: translateX(-50%);
}

.ky-label {
  left: -2rem;
  top: 50%;
  transform: translateY(-50%) rotate(-90deg);
}

#sequenceCanvas {
  border: 1px solid var(--line);
  border-radius: 2px;
  background: #fff;
}

/* Readouts and callouts ----------------------------------------------- */

.info-box,
.signal-info {
  background: transparent;
  border-radius: 0;
  border: 0;
  border-top: 1px solid var(--line);
  padding: 0.75rem 0 0;
  margin: 0.25rem 0 0;
  min-height: 0;
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--muted);
}

.signal-info {
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
}

.equation {
  background: transparent;
  border-radius: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 1rem;
  padding: 1rem 0;
  margin: 1.5rem 0;
}

.explanation,
.instructions,
.quantum-box,
.sequence-diagram {
  background: transparent;
  border-radius: 0;
  border: 0;
  border-top: 1px solid var(--line);
  padding: 2rem 0 0;
  margin: 3rem 0 0;
  text-align: left;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.sequence-diagram {
  text-align: left;
}

.sequence-description {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.k-space-indicator {
  background-color: var(--accent);
  width: 0.6rem;
  height: 0.6rem;
}

.highlight-line {
  stroke: var(--accent);
}

@media (max-width: 640px) {
  .gradient-controls {
    flex-direction: column;
    gap: 1.25rem;
  }

  /* The plot spans the full width, so tuck the ky label inside the frame. */
  .ky-label {
    left: 0.6rem;
    top: 0.5rem;
    transform: none;
    color: rgba(255, 255, 255, 0.6);
  }
}