:root {
  --bg-top: #1d2e31;
  --bg-bottom: #253538;
  --panel: rgba(34, 47, 50, 0.96);
  --dock: rgba(40, 55, 58, 0.95);
  --border: rgba(120, 175, 165, 0.28);
  --ink: #d8eae8;
  --muted: #7eaaa6;
  /* The fill behind a selected card. Darkened from #1a8a7a, which put its near-white
     label at 4.13:1 — under the 4.5:1 AA needs for text this size. #177a6c reads 5.07:1
     and is close enough that nothing else in the palette had to move. */
  --teal-900: #177a6c;
  --teal-700: #22a090;
  --focus: #4db8ff;
  --focus-glow: #ffd166;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.55);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

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

html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(ellipse at 30% 0%, rgba(180, 140, 40, 0.14), transparent 40%),
    radial-gradient(ellipse at 80% 100%, rgba(10, 60, 70, 0.35), transparent 45%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  color: var(--ink);
  font-family: Roboto, Arial, sans-serif;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

button, input { font: inherit; }
button { cursor: pointer; }

button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px var(--focus-glow);
}

#sim-app {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 10px;
}

#stage-panel {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 10px;
  padding: 10px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

#canvas-frame {
  position: relative;
  min-height: 0;
  overflow: hidden;
  border-radius: 20px;
  background:
    radial-gradient(ellipse at 50% 2%, rgba(255, 226, 160, 0.30), transparent 42%),
    radial-gradient(ellipse at 50% 100%, rgba(70, 108, 116, 0.42), transparent 52%),
    linear-gradient(180deg, #47606a 0%, #33474f 52%, #22333a 100%);
  box-shadow: inset 0 0 0 1px rgba(150, 195, 190, 0.20);
}

#sim-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

/* The canvas is the sim's main control surface — tabindex=0, role=application, and the
   depth, trees and channel keys all live on it — so it has to show when it holds focus.
   Drawn inside the frame, in the light blue that reads against a dark 3D scene, with a
   soft inner glow so the ring survives wherever the diorama happens to be pale. */
#sim-canvas:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: -3px;
  box-shadow: inset 0 0 0 7px rgba(77, 184, 255, 0.30);
}

/* ── Year track ──────────────────────────────────────────────────────────── */

#year-track {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 14px;
  pointer-events: none;
}

#year-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

#year-head strong {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
}

#year-head span {
  font-size: 14px;
  font-weight: 500;
  color: #dfeeea;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
}

#year-bar {
  position: relative;
  height: 22px;
  border-radius: 11px;
  background: rgba(12, 22, 24, 0.55);
  border: 1px solid rgba(190, 225, 218, 0.34);
  overflow: hidden;
}

#year-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: linear-gradient(90deg, rgba(34, 160, 144, 0.85), rgba(120, 200, 120, 0.85));
  transition: width 0.1s linear;
}

#year-marker {
  position: absolute;
  top: -3px;
  bottom: -3px;
  left: 0%;
  width: 3px;
  border-radius: 2px;
  background: #ffd166;
  box-shadow: 0 0 6px rgba(255, 209, 102, 0.9);
  transition: left 0.1s linear;
}

.year-band {
  position: absolute;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 1px solid rgba(190, 225, 218, 0.26);
}

.year-band:last-child { border-right: none; }

.year-band span {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: #eaf6f3;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.75);
  white-space: nowrap;
  overflow: hidden;
  padding: 0 4px;
}

@media (max-width: 640px) {
  .year-band span { display: none; }
}

/* Labels that sit on the diorama and name the control underneath them. Sentence case, not
   uppercase: these are words a third grader reads and says out loud, and the two badges
   have to match each other. */
.interaction-hint {
  position: absolute;
  transform: translate(-50%, -100%);
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(12, 22, 24, 0.78);
  border: 1px solid rgba(130, 180, 170, 0.26);
  color: #cfe8e2;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.2px;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.interaction-hint.hidden { opacity: 0; }

/* Setup controls step off the diorama while a year is running. Not merely dimmed: a
   greyed control still invites a press, and there is nothing here a student should be
   pressing until the year is over. */
.interaction-hint.locked {
  opacity: 0;
  pointer-events: none;
}

/* Anchored to a place in the 3D scene rather than a corner of the frame; JS sets
   left/top from the projected world point each frame. */
.scene-badge {
  top: 0;
  left: 0;
  right: auto;
  transform: translate(-50%, -50%);
  border-color: rgba(160, 216, 232, 0.45);
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

/* The depth badge is a real control, not a caption: it is a second grab handle for the
   knob it sits beside, so it takes pointer events and drags vertically. It is a much
   bigger target than the knob, which matters for the age band. */
.depth-badge {
  pointer-events: auto;
  gap: 4px;
  padding: 4px 8px;
  cursor: ns-resize;
  touch-action: none;
  user-select: none;
}

/* The channel badge presses too, so all three scene labels are handles rather than one
   caption among two controls — and a label that takes hover is the only way it can carry a
   tooltip like the other two. The groove underneath still works; this is a second target. */
.channel-badge {
  pointer-events: auto;
  cursor: pointer;
  user-select: none;
}

/* The trees badge is a tap target: one press moves to the next of the three states. */
.trees-badge {
  pointer-events: auto;
  gap: 7px;
  padding: 4px 8px;
  cursor: pointer;
  user-select: none;
}

/* Carousel dots: how many states there are, and which one you are on. */
.badge-dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding-left: 2px;
  border-left: 1px solid rgba(160, 216, 232, 0.28);
  margin-left: 1px;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  border: 1px solid rgba(190, 230, 240, 0.6);
  background: transparent;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.badge-dot:first-child { margin-left: 3px; }
.badge-dot.on { background: #eafaff; border-color: #eafaff; }

.depth-badge .hint-label strong,
.trees-badge .hint-label strong {
  color: #eafaff;
  font-weight: 700;
}

.scene-badge.hot {
  background: rgba(30, 74, 84, 0.92);
  border-color: #9fd8e8;
  color: #eafaff;
}

/* ── Control tooltip ─────────────────────────────────────────────────────── */

#tip {
  position: fixed;
  z-index: 60;
  max-width: 290px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  background: #08181a;
  border: 1px solid rgba(150, 200, 192, 0.4);
  color: #eaf7f4;
  font-size: 13.5px;
  line-height: 1.45;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.55);
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.12s ease, transform 0.12s ease;
}

#tip.show {
  opacity: 1;
  transform: translateY(0);
}

/* ── Controls dock ───────────────────────────────────────────────────────── */

#controls-dock {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-lg);
  background: var(--dock);
  border: 1px solid var(--border);
}

.control-card {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 8px 12px 10px;
  border-radius: var(--radius-md);
  background: rgba(12, 20, 22, 0.55);
  border: 1px solid rgba(90, 140, 130, 0.16);
}

.card-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.7px;
  text-transform: uppercase;
  color: var(--muted);
}

.seg-btns {
  display: flex;
  gap: 5px;
}

.seg-btn {
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(110, 160, 150, 0.26);
  background: rgba(30, 44, 46, 0.9);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.seg-btn:hover { background: rgba(42, 62, 64, 0.95); }

.seg-btn.active {
  background: var(--teal-900);
  border-color: var(--teal-700);
  color: #f2fffc;
}

/* ── Species toggles ─────────────────────────────────────────────────────── */

.species-card { flex: 1 1 320px; }

.species-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.species-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px 5px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(110, 160, 150, 0.26);
  background: rgba(30, 44, 46, 0.9);
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.species-btn canvas {
  display: block;
  width: 38px;
  height: 28px;
  border-radius: 5px;
  /* A pool-water ground behind the animal, since these are all aquatic forms. */
  background: rgba(74, 144, 168, 0.42);
}

.species-btn:hover:not(:disabled) { background: rgba(42, 62, 64, 0.95); }

/* Dimmed while a year runs, not hidden: these cards double as the key for what is in the
   pool, and that is exactly what a student wants to read WHILE watching the year. */
.species-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.species-btn.active {
  background: var(--teal-900);
  border-color: var(--teal-700);
  color: #f2fffc;
}

/* ── Arrivals legend ─────────────────────────────────────────────────────── */
/* Reads as a key, not a control: no fill, no pressed state, dimmed when the animal is
   not in the pool. Dimming rather than hiding so a student can see these exist and learn
   what brings them. */

/* Stacked on purpose: the toggles wrap unpredictably, and a vertical divider between
   them and the arrivals ended up orphaned at the right edge whenever they did. */
.species-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.arrival-split {
  height: 1px;
  margin: 2px 0 0;
  background: rgba(140, 190, 180, 0.26);
}

.arrival-block {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.arrival-heading {
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.3px;
  color: var(--muted);
}

.arrival-items {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* Dimming the whole row to 0.38 put this text at 1.99:1, which is unreadable and well
   under AA — and it is a key, so it has to be read in exactly the state that says the
   animal is absent. The absent/present difference is carried by the ICON instead, which
   no contrast rule applies to, while the words stay at full opacity. */
.arrival-item {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 2px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.arrival-item.here { color: #e6f5f1; }

.arrival-item.here canvas {
  opacity: 1;
  filter: none;
}

.arrival-item canvas {
  display: block;
  width: 38px;
  height: 28px;
  border-radius: 5px;
  background: rgba(74, 144, 168, 0.42);
  opacity: 0.42;
  filter: saturate(0.3);
  transition: opacity 0.2s ease, filter 0.2s ease;
}

.arrival-item.here canvas {
  opacity: 1;
  filter: none;
}

.arrival-item .arrival-note {
  font-size: 12.5px;
  font-weight: 400;
  color: var(--muted);
}

/* ── Info dialog ─────────────────────────────────────────────────────────── */

/* Verbatim copy of the boilerplate block, not a per-sim restyle (machine-verifiable
   COLOR-2 / TYPO-4). The dialog is Tuva Sims chrome, not the sim's: the shared toolbar
   injects #info-dialog-scoped rules after this stylesheet and wins on specificity, so a
   per-sim recolor here is dead weight that only drifts. This sim used to carry a green
   header, its own tab pills and its own dialog typography. */
#info-dialog {
  border: none;
  border-radius: 12px;
  padding: 0;
  width: min(560px, calc(100vw - 32px));
  max-height: calc(100vh - 80px);
  overflow: hidden;
  margin: auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.22);
  background: #ffffff;
}

#info-dialog::backdrop {
  background: rgba(30, 16, 48, 0.55);
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: #5c4738;
  color: #ffffff;
}

.dialog-header h2 {
  font-size: 16px;
  font-weight: 600;
}

#dialog-close-btn {
  background: transparent;
  border: none;
  color: #ffffff;
  font-size: 18px;
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

#dialog-close-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

#dialog-close-btn:focus-visible {
  outline: 3px solid var(--focus-glow);
  outline-offset: 2px;
}

.dialog-tabs {
  display: flex;
  border-bottom: 2px solid #E5EAE9;
  background: #F8FBFB;
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  padding: 10px 0;
  font-family: Roboto, Arial, sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.tab-btn:hover {
  color: #5c4738;
}

.tab-btn.active,
.tab-btn[aria-selected="true"] {
  color: #5c4738;
  border-bottom-color: #5c4738;
}

.tab-btn:focus-visible {
  outline: 3px solid var(--focus-glow);
  outline-offset: -3px;
}

.dialog-body {
  padding: 16px 20px;
  overflow-y: auto;
  max-height: calc(100vh - 240px);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.55;
}

.dialog-body h3 {
  font-size: 14px;
  font-weight: 600;
  color: #5c4738;
  margin-top: 14px;
  margin-bottom: 6px;
}

.dialog-body h3:first-child {
  margin-top: 0;
}

.dialog-body p {
  margin-bottom: 8px;
}

.dialog-body ul,
.dialog-body ol {
  padding-left: 20px;
  margin-bottom: 8px;
}

.dialog-body li {
  margin-bottom: 4px;
}

#info-dialog summary {
  cursor: pointer;
  font-weight: 600;
  color: #5c4738;
  margin-top: 12px;
}

.standard-tag {
  display: inline-block;
  padding: 1px 7px;
  margin-right: 5px;
  border-radius: 5px;
  background: #e7f1f0;
  color: #004445;
  font-weight: 600;
  font-size: 13px;
}

@media (max-width: 720px) {
  #controls-dock { gap: 7px; padding: 8px; }
  .control-card { padding: 6px 9px 8px; }
  .seg-btn { padding: 6px 9px; font-size: 12px; }
  .species-btn { font-size: 14px; }
}