@font-face {
  font-family: PublicSans;
  src: url("../third_party/publicsans/fonts/otf/PublicSans-Regular.otf") format("opentype");
}

html {
  background-color: #F9F9F9;
  font-family: PublicSans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
}

a, a:link, a:visited {
  color: #5050C0;
}

a:hover, a:active {
  color: #202070;
}

/* Header / top navbar — reuses the landing site's green animated banner
   (palette and .header-intro animation from landing; see intro_animation.js). */
header {
  position: relative;
  overflow: hidden;
  color: black;
  background-color: #E0F0E0;
  padding: 12px 16px;
  border: 1px solid #A0A0A0;
  border-radius: 10px;
  box-shadow: 5px 5px 10px rgba(10, 10, 10, 0.2);
  margin-bottom: 30px;
}

header .header-intro {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.phase {
  display: none;
}

.phase.active {
  display: block;
}

.nav-buttons {
  margin-top: 20px;
}

.nav-buttons button.primary {
  background-color: #7070C0;
  color: white;
  border-radius: 10px;
  padding: 7px;
  border: none;
  cursor: pointer;
  font-size: 15px;
  font-family: inherit;
}

.nav-buttons button.primary:focus,
.nav-buttons button.primary:hover,
.nav-buttons button.primary:active {
  background-color: #5050C0;
}

.phase-two-col .col-code,
.phase-two-col .col-text {
  padding: 10px;
}

@media (max-width: 999px) {
  .phase-two-col {
    display: block;
  }
}

@media (min-width: 1000px) {
  .phase-two-col {
    display: grid;
    grid-template-columns: 50% 50%;
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to   { opacity: 0; }
}

.fade-in {
  animation: fadeIn 0.65s ease-in-out forwards;
}

.fade-out {
  animation: fadeOut 0.65s ease-in-out forwards;
}

@media (prefers-reduced-motion: reduce) {
  .fade-in,
  .fade-out {
    animation: none;
  }
}

/* ---- code-line block rendering with line-number gutter ---- */

#buildup-code-display {
  counter-reset: line-number;
}

.code-line {
  display: block;
  min-height: 1.4em;
  padding-left: 3.5em;
  position: relative;
  white-space: pre;
  /* Reserve border space on ALL lines so added-line border doesn't shift layout */
  border-left: 3px solid transparent;
  box-sizing: border-box;
}

.code-line::before {
  counter-increment: line-number;
  content: counter(line-number);
  position: absolute;
  left: 0;
  width: 2.8em;
  text-align: right;
  padding-right: 0.5em;
  color: #aaa;
  font-size: 0.85em;
  line-height: 1.4em;
  user-select: none;
  box-sizing: border-box;
}

/* ---- "glow, then settle" animation for newly added lines ---- */

@keyframes lineAdded {
  0%   { opacity: 0; background-color: #d4f5d4; border-left-color: #3a9d3a; }
  30%  { opacity: 1; background-color: #d4f5d4; border-left-color: #3a9d3a; }
  55%  { opacity: 1; background-color: #d4f5d4; border-left-color: #3a9d3a; }
  100% { opacity: 1; background-color: transparent; border-left-color: transparent; }
}

.code-line-added {
  animation: lineAdded 1.6s ease-out forwards;
}

@media (prefers-reduced-motion: reduce) {
  .code-line-added {
    animation: none;
  }
}

/* ---- Prism token colors: matched to the Ace "textmate" theme used by the
   IDE editor (editor.joshsim.org), for visual consistency. Hexes are the
   exact ace-tm token colors. ---- */

.token.keyword           { color: #0000ff; }              /* ace_keyword (blue) */
.token.boolean           { color: #0000ff; }              /* true/false render as keyword in Ace */
.token.function          { color: #3c4c72; }              /* ace_support.ace_function */
.token.string            { color: #036a07; }              /* ace_string */
.token.number            { color: #0000cd; }              /* ace_constant.ace_numeric */
.token.operator          { color: #687687; }              /* ace_keyword.ace_operator */
.token.comment           { color: #4c886b; font-style: italic; } /* ace_comment */
.token.variable-language { color: #318495; }              /* ace_variable (meta/prior/current/here) */
.token.punctuation       { color: #000000; }              /* Ace default foreground */
.token.variable          { color: #000000; }              /* identifier text is black in Ace */

/* ---- Phase transition overlay fix (Task B) ----
   The outgoing section is lifted out of normal flow during the fade so
   the incoming section stays at the top rather than rendering below. */
#narrative {
  position: relative;
}

.phase.leaving,
#phase-welcome.phase.leaving,
#phase-conclusion.phase.leaving {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
}

/* ---- Welcome and Conclusion hero treatment (Task C) ---- */

#phase-welcome.active,
#phase-conclusion.active {
  position: relative;
  overflow: hidden;
  background-color: #8080B0;
  border-radius: 10px;
  box-shadow: 5px 5px 10px rgba(10, 10, 10, 0.2);
  padding: 56px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.phase-intro {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.phase-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 680px;
  background-color: rgba(40, 40, 70, 0.45);
  padding: 28px 32px;
  border-radius: 12px;
}

/* White text with black outline so headings/paragraphs read over the tile texture. */
#phase-welcome .phase-hero-inner h1,
#phase-welcome .phase-hero-inner h2,
#phase-welcome .phase-hero-inner p,
#phase-conclusion .phase-hero-inner h1,
#phase-conclusion .phase-hero-inner h2,
#phase-conclusion .phase-hero-inner p {
  color: white;
  text-shadow:
    -1px -1px 0 #000,
    1px -1px 0 #000,
    -1px  1px 0 #000,
    1px  1px 0 #000;
}

/* Links in the hero box: light + underlined so they read on the dark panel. */
#phase-welcome .phase-hero-inner a,
#phase-welcome .phase-hero-inner a:link,
#phase-welcome .phase-hero-inner a:visited,
#phase-conclusion .phase-hero-inner a,
#phase-conclusion .phase-hero-inner a:link,
#phase-conclusion .phase-hero-inner a:visited {
  color: #cfe3ff;
  text-decoration: underline;
}

#phase-welcome .phase-hero-inner a:hover,
#phase-welcome .phase-hero-inner a:focus,
#phase-welcome .phase-hero-inner a:active,
#phase-conclusion .phase-hero-inner a:hover,
#phase-conclusion .phase-hero-inner a:focus,
#phase-conclusion .phase-hero-inner a:active {
  color: #ffffff;
}

#phase-buildup.active {
  padding: 20px;
}

.col-code {
  background-color: #F0F0F0;
}

.col-code pre {
  margin: 0;
  padding: 10px;
  font-family: monospace;
  font-size: 14px;
  white-space: pre;
}

.nav-buttons button.secondary {
  background-color: #E0E0E0;
  color: #333;
  border-radius: 10px;
  padding: 7px;
  border: none;
  cursor: pointer;
  font-size: 15px;
  font-family: inherit;
}

.nav-buttons button.secondary:focus,
.nav-buttons button.secondary:hover,
.nav-buttons button.secondary:active {
  background-color: #C8C8C8;
}

.nav-buttons button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Plain-language "what & why" lede above the detailed build-up prose.
   Authored as a pandoc fenced div, so it renders as <div class="buildup-lede"><p>…</p></div>. */
#buildup-text-panel .buildup-lede,
#buildup-text-panel .buildup-lede p {
  font-size: 1.2em;
  line-height: 1.4;
  color: #222;
}

#buildup-text-panel .buildup-lede {
  margin: 0 0 14px;
}

#buildup-text-panel .buildup-lede p {
  margin: 0;
}

/* Prominent example config (.jshc) card shown in the Export & Config substep. */
.config-example {
  margin: 14px 0;
  border: 1px solid #C8C8E8;
  border-radius: 8px;
  overflow: hidden;
}

.config-example-label {
  background-color: #F0F0F8;
  color: #5050C0;
  font-family: monospace;
  font-size: 0.8em;
  padding: 5px 10px;
  border-bottom: 1px solid #C8C8E8;
}

.config-example pre {
  margin: 0;
  padding: 10px;
  background-color: #F0F0F0;
  font-family: monospace;
  font-size: 13px;
  white-space: pre;
  overflow-x: auto;
}

/* ---- Build-up stepper (mini progress nav in .col-text) ---- */

#buildup-stepper {
  margin-bottom: 16px;
  padding: 10px 12px;
  background-color: #F0F0F8;
  border-radius: 8px;
  border: 1px solid #C8C8E8;
}

.stepper-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.stepper-item {
  margin: 0;
  padding: 0;
}

.stepper-btn {
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 0.85em;
  font-family: inherit;
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.stepper-btn--current {
  background-color: #7070C0;
  color: #fff;
  border-color: #5050A0;
  cursor: default;
}

.stepper-btn--completed {
  background-color: #D4D4F0;
  color: #3030A0;
  border-color: #A0A0D8;
}

.stepper-btn--completed:hover,
.stepper-btn--completed:focus {
  background-color: #B8B8E8;
  border-color: #7070C0;
}

.stepper-btn--upcoming {
  background-color: transparent;
  color: #999;
  border-color: #CCC;
}

.stepper-btn--upcoming:hover,
.stepper-btn--upcoming:focus {
  background-color: #E8E8F8;
  color: #5050C0;
  border-color: #A0A0D8;
}

/* When nav-buttons lives inside .col-text, reduce its top margin slightly */
.col-text .nav-buttons {
  margin-top: 16px;
}

/* ---- External-data figures (build-up substep 4) ---- */

.ext-figures {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 16px 0 8px;
  max-width: 460px;
}

@media (max-width: 500px) {
  .ext-figures {
    grid-template-columns: 1fr;
  }
}

.ext-figures figure {
  margin: 0;
  padding: 6px;
  background-color: #FFFFFF;
  border: 1px solid #E0E0E0;
  border-radius: 6px;
}

.ext-figures img {
  display: block;
  width: 100%;
  height: auto;
}

.ext-figures-caption {
  font-size: 0.85em;
  color: #666;
  font-style: italic;
  margin: 0;
}

.ext-figures-heading {
  font-size: 1em;
  margin: 24px 0 8px;
  color: #333;
}

/* ---- Playground phase ---- */

#phase-playground.active {
  padding: 20px;
}

/* #phase-conclusion.active is handled by the hero rules above. */

#playground-editor {
  height: 480px;
  width: 100%;
}

#playground-config-details {
  margin-top: 12px;
}

#playground-config {
  width: 100%;
  box-sizing: border-box;
  font-family: monospace;
  font-size: 13px;
  resize: vertical;
}

#playground-results {
  min-height: 200px;
}

.col-results {
  padding: 10px;
}

/* When nav-buttons lives inside .col-code--playground, use same spacing as .col-text */
.col-code--playground .nav-buttons {
  margin-top: 16px;
}

/* ---- Playground run indicator and error display ---- */

#playground-running-indicator {
  color: #666;
  font-style: italic;
  padding: 20px;
}

@media (prefers-reduced-motion: reduce) {
  #playground-running-indicator {
    animation: none;
    opacity: 1;
  }
}

.playground-error {
  color: #c0392b;
  padding: 10px;
  background-color: #fdecea;
  border-radius: 6px;
  border-left: 3px solid #c0392b;
}

#playground-done-message {
  color: #666;
  font-style: italic;
  padding: 20px;
}

/* ---- Playground hint text ---- */

.playground-hint {
  margin: 6px 0 2px;
  font-size: 0.85em;
  color: #888;
  font-style: italic;
}

/* ---- Visualization (heatmap + scrub) ----
   Layout helpers plus the editor's SVG styling, ported from
   editor/style/style.css (scoped from #results to #playground-viz) so the
   scrub bars/ticks/hit-areas render like the IDE instead of defaulting to
   black fill. Internal ids/classes come from the shared viz.js. */

.viz-holder {
  margin: 10px 0;
}

.horiz-scroll-area {
  overflow-x: auto;
}

#playground-viz #grid-viz-holder {
  width: 100%;
  text-align: center;
}

#playground-viz #grid-legend {
  margin: 20px auto;
  border-collapse: separate;
  border-spacing: 5px;
}

#playground-viz #grid-legend .color td {
  height: 10px;
  min-width: 40px;
}

#playground-viz #grid-legend .label td {
  text-align: center;
}

#playground-viz #grid-viz {
  width: 100%;
  margin: 0 auto;
}

#playground-viz #grid-viz .base-layer {
  opacity: 0.75;
}

#playground-viz #grid-viz .glyphs-layer.overlay {
  opacity: 0.65;
}

#playground-viz #grid-viz .grid-patch-foreground:hover {
  stroke: #333333;
  stroke-weight: 2;
}

#playground-viz #grid-viz-info {
  margin-top: 20px;
  margin-bottom: 20px;
  color: #555;
  min-height: 1.4em;
}

#playground-viz #scrub-viz {
  width: 100%;
  height: 100px;
  display: block;
}

#playground-viz #scrub-viz .horizontal-tick {
  text-anchor: middle;
  dominant-baseline: hanging;
  font-size: 13px;
  fill: #757575;
}

#playground-viz #scrub-viz .scrub-group .display-bar {
  fill: #00B0D0;
}

#playground-viz #scrub-viz .scrub-group .horizontal-embed-tick {
  visibility: hidden;
}

#playground-viz #scrub-viz .scrub-group .pointer-target {
  fill-opacity: 0;
  stroke-opacity: 0;
}

#playground-viz #scrub-viz .scrub-group:hover {
  cursor: pointer;
}

#playground-viz #scrub-viz .scrub-group:hover .display-bar {
  fill: #0080A0;
}

#playground-viz #scrub-viz .scrub-group:hover .pointer-target {
  stroke-opacity: 1;
  stroke-width: 1;
  stroke: #C0C0C0;
}

#playground-viz #scrub-viz .scrub-group.active .display-bar {
  fill: #0080A0;
}

#playground-viz #scrub-viz .scrub-group.active .horizontal-embed-tick {
  fill: #333333;
  font-size: 13px;
  visibility: visible;
  text-anchor: middle;
  dominant-baseline: hanging;
  font-weight: bold;
}

#playground-viz #scrub-viz .selected-value-display {
  visibility: hidden;
}

#playground-viz #scrub-viz .selected-value-display.active {
  fill: #333333;
  font-weight: bold;
  dominant-baseline: auto;
  text-anchor: middle;
  font-size: 11px;
  visibility: visible;
}

#playground-viz #scrub-viz .vertical-tick {
  text-anchor: left;
  dominant-baseline: middle;
  font-size: 13px;
  fill: #757575;
}

/* ---- Top navbar (brand + site nav pills + table-of-contents) and ToC dialog ---- */

#top-nav {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* #toc-open-button is the demo title/menu control on the left of the navbar. */
#toc-open-button {
  font-weight: 700;
  font-size: 1.1em;
  font-family: inherit;
  color: #333333;
  background: transparent;
  border: 1px solid rgba(0, 0, 0, 0.25);
  border-radius: 8px;
  padding: 5px 12px;
  cursor: pointer;
  white-space: nowrap;
}

#toc-open-button:hover,
#toc-open-button:focus {
  background-color: rgba(0, 0, 0, 0.08);
  border-color: rgba(0, 0, 0, 0.4);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

/* Pill links/button reuse the landing site's nav-option palette. */
.nav-option a,
.nav-option a:link,
.nav-option a:visited,
.nav-option button {
  background-color: #708070;
  color: white;
  border-radius: 10px;
  padding: 7px 12px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-size: 0.95em;
  font-family: inherit;
}

.nav-option a:hover,
.nav-option a:focus,
.nav-option a:active,
.nav-option button:hover,
.nav-option button:focus {
  background-color: #507050;
}

#toc-dialog {
  border: 1px solid #C8C8E8;
  border-radius: 10px;
  padding: 24px;
  max-width: 360px;
  width: 90vw;
  box-shadow: 0 4px 24px rgba(0,0,0,0.18);
}

#toc-dialog::backdrop {
  background: rgba(0,0,0,0.35);
}

#toc-dialog h2 {
  margin: 0 0 16px;
  font-size: 1.1em;
  color: #333;
}

#toc-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

#toc-list li {
  margin: 0;
  padding: 0;
}

.toc-item-btn {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  border-radius: 6px;
  padding: 7px 10px;
  font-size: 0.95em;
  font-family: inherit;
  color: #333;
  cursor: pointer;
}

.toc-item-btn:hover,
.toc-item-btn:focus {
  background-color: #E8E8F8;
  color: #5050C0;
}

.toc-item-btn[aria-current="step"] {
  background-color: #D4D4F0;
  color: #3030A0;
  font-weight: bold;
}

#toc-close-button {
  display: block;
  margin-left: auto;
  background-color: #E0E0E0;
  color: #333;
  border: none;
  border-radius: 6px;
  padding: 6px 16px;
  font-size: 0.9em;
  font-family: inherit;
  cursor: pointer;
}

#toc-close-button:hover,
#toc-close-button:focus {
  background-color: #C8C8C8;
}