/* ME322 brand tokens */
:root {
  --color-primary: #095031;
  --color-primary-hover: #0b6540;
  --color-accent: #fec735;
  --color-accent-hover: #e6b12a;
  --color-text: #343434;
  --color-text-muted: #5c5c5c;
  --color-bg: #ffffff;
  --font-sans: "Segoe UI", "Helvetica Neue", sans-serif;
}

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

body {
  margin: 0;
}

img {
  max-width: 100%;
  display: block;
}

/* Base document */
html {
  font-family: var(--font-sans);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
}

body {
  min-height: 100vh;
  font-family: inherit;
  color: inherit;
  background-color: inherit;
}

#app {
  min-height: 100vh;
}

/* Typography */
h1,
h2,
h3 {
  margin: 0 0 0.5em;
  color: var(--color-primary);
  line-height: 1.2;
  font-weight: 700;
}

p {
  margin: 0 0 1em;
  color: var(--color-text);
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Color helpers */
.text-primary {
  color: var(--color-primary);
}

.text-accent {
  color: var(--color-accent);
}

.bg-primary {
  background-color: var(--color-primary);
  color: var(--color-bg);
}

.bg-accent {
  background-color: var(--color-accent);
  color: var(--color-text);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.6em 1.2em;
  border: 2px solid transparent;
  border-radius: 0.25rem;
  font: inherit;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-bg);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-bg);
}

.btn-accent {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-text);
}

.btn-accent:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-text);
}

/* Page layout */
.page {
  max-width: 44rem;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

.page-intro {
  color: var(--color-text-muted);
}

.page-list {
  margin: 0 0 1.5em;
  padding-left: 1.25em;
  color: var(--color-text);
}

.page-list li {
  margin-bottom: 0.35em;
}

.page-section {
  margin: 0 0 1.75em;
}

.page-section h2 {
  margin-bottom: 0.4em;
  font-size: 1.15rem;
}

.page-section-accent {
  padding-left: 0.85em;
  border-left: 3px solid var(--color-accent);
}

.param-list {
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--color-text);
}

.param-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35em 0.75em;
  margin-bottom: 0.5em;
  padding-bottom: 0.5em;
  border-bottom: 1px solid color-mix(in srgb, var(--color-primary) 12%, transparent);
}

.param-list li:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.param-symbol {
  flex: 0 0 auto;
  min-width: 4.5em;
  font-weight: 600;
  color: var(--color-primary);
}

.param-label {
  flex: 1 1 8rem;
  color: var(--color-text-muted);
}

.param-value {
  flex: 0 0 auto;
  font-weight: 600;
  color: var(--color-text);
  margin-left: auto;
}

.page-actions {
  margin-top: 0.5em;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Wide page for schematic / media layouts */
.page-wide {
  max-width: 68rem;
}

/* Schematic stage */
.schematic-stage {
  position: relative;
  margin: 0 0 1.25em;
  border: 1px solid color-mix(in srgb, var(--color-primary) 18%, transparent);
  background:
    radial-gradient(
      ellipse 80% 60% at 50% 40%,
      color-mix(in srgb, var(--color-primary) 6%, var(--color-bg)),
      var(--color-bg)
    );
  overflow: hidden;
}

.schematic-canvas {
  position: relative;
  width: 100%;
  min-height: 22rem;
  aspect-ratio: 16 / 9;
  touch-action: none;
}

.schematic-canvas canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.schematic-labels {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.schematic-label {
  position: absolute;
  transform: translate(-50%, -100%);
  margin-top: -0.35rem;
  padding: 0.2em 0.5em;
  border: 1px solid color-mix(in srgb, var(--color-primary) 25%, transparent);
  border-radius: 0.2rem;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
  pointer-events: auto;
  cursor: pointer;
  user-select: none;
}

.schematic-label:hover,
.schematic-label.is-active {
  border-color: var(--color-accent);
  background: var(--color-bg);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-accent) 55%, transparent);
}

.schematic-label:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.schematic-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  margin: 0 0 1.5em;
}

.schematic-control-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  flex: 1 1 16rem;
}

.schematic-control-group label {
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

.schematic-slider {
  flex: 1 1 10rem;
  min-width: 8rem;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.schematic-slider:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.schematic-length-value {
  min-width: 4.5rem;
  font-weight: 600;
  color: var(--color-text);
}

.schematic-hint {
  margin: 0 0 1em;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.schematic-legend {
  margin: 0 0 1.75em;
}

.schematic-detail-prompt {
  margin-bottom: 0;
}

.schematic-detail {
  margin-top: 0.25em;
}

.schematic-detail-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-bottom: 0.35em;
}

.schematic-detail-symbol {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.schematic-detail-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
}

.schematic-detail-label {
  margin: 0 0 0.35em;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
}

.schematic-detail-note {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

@media (max-width: 40rem) {
  .schematic-canvas {
    min-height: 16rem;
    aspect-ratio: 4 / 3;
  }
}