/* ============================================================
   tools-shared.css — shared styles for all interactive tools
   Each tool provides its own CSS variables and title styles
   in its own thin CSS file loaded after this one.
   ============================================================ */

@font-face {
  font-family: "Comic Neue";
  src: url("../fonts/ComicNeue-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
}

@font-face {
  font-family: "Comic Neue";
  src: url("../fonts/ComicNeue-Bold.ttf") format("truetype");
  font-weight: 700;
  font-style: normal;
}

/* ---------- reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Comic Neue", "Comic Sans", "Chalkboard SE", cursive;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

p, dd, li, .explain-box, .field-hint, .section-intro {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.97rem;
}

a { color: var(--link-color); }
a:visited { color: var(--link-visited); }
a:focus-visible { outline: 3px solid var(--hot); outline-offset: 2px; }
strong { color: var(--hot); }
em { font-style: italic; }

/* ---------- retro header ---------- */
.retro-header {
  background: var(--heading);
  color: #ffff00;
  text-align: center;
  padding: 24px 16px 20px;
  border-bottom: 6px double #ffff00;
}
.header-inner { max-width: 860px; margin: 0 auto; }

.blink-badge {
  display: inline-block;
  background: #ff0000;
  color: #ffff00;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 4px;
  margin-bottom: 8px;
  animation: blinker 1.2s step-start infinite;
  letter-spacing: 0.1em;
}
@keyframes blinker { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .blink-badge { animation: none; } }

.main-title {
  margin: 0 0 6px;
  line-height: 1.1;
}

.tagline {
  margin: 0 0 4px;
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: #ffff00;
  font-weight: 700;
}

.subtagline {
  margin: 0 0 12px;
  font-size: 0.9rem;
  color: #ffffff;
  font-family: Arial, Helvetica, sans-serif;
}

.retro-meta {
  font-size: 0.75rem;
  color: #ccffcc;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-family: "Courier New", monospace;
}
.pipe { opacity: 0.5; }

.counter {
  font-family: "Courier New", monospace;
  background: #000;
  color: #00ff41;
  padding: 1px 6px;
  border-radius: 3px;
  letter-spacing: 0.15em;
}

/* ---------- page layout ---------- */
.page-main {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 60px;
}

/* ---------- content boxes ---------- */
.content-box {
  background: var(--card);
  border: 4px solid var(--border);
  border-radius: 0;
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 32px;
}
.content-box h2 {
  margin: 0 0 16px;
  font-size: clamp(1.3rem, 3.5vw, 1.8rem);
  color: var(--heading);
  text-shadow: 2px 2px 0 var(--bg-alt);
  border-bottom: 3px dashed var(--border);
  padding-bottom: 8px;
}

/* ---------- intro grid ---------- */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 640px) { .intro-grid { grid-template-columns: 1fr; } }

.concept-list {
  background: var(--bg-alt);
  border: 2px solid var(--border);
  padding: 16px;
}
.concept-list h3 {
  margin: 0 0 10px;
  color: var(--heading);
  font-size: 1rem;
}
dl { margin: 0; }
dt {
  font-weight: 700;
  color: var(--hot);
  font-family: Arial, Helvetica, sans-serif;
  margin-top: 8px;
}
dd { margin: 2px 0 0 16px; }

/* ---------- setup form ---------- */
.setup-form { display: grid; gap: 14px; }
.form-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
}
.form-row label {
  font-weight: 700;
  color: var(--heading);
  min-width: 160px;
}
.form-row input {
  font-family: "Courier New", monospace;
  font-size: 1rem;
  padding: 8px 10px;
  border: 3px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  border-radius: 0;
  width: 160px;
  min-width: 80px;
}
.form-row input:focus {
  outline: 3px solid var(--hot);
  outline-offset: 2px;
}
.field-hint {
  font-size: 0.8rem;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
}
.error-msg {
  color: var(--error);
  font-weight: 700;
  font-size: 0.9rem;
  font-family: Arial, Helvetica, sans-serif;
}

/* ---------- buttons (win95 bevelled) ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  font-family: "Comic Neue", "Comic Sans", cursive;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  min-height: 44px;
  min-width: 44px;
  border-top:    3px solid;
  border-left:   3px solid;
  border-bottom: 3px solid;
  border-right:  3px solid;
  border-color: #fff #808080 #808080 #fff;
  background: var(--btn-bg);
  color: var(--text);
  user-select: none;
  -webkit-user-select: none;
  transition: filter 0.1s;
}
.btn:active,
.btn:focus-visible {
  border-color: #808080 #fff #fff #808080;
  outline: 3px solid var(--hot);
  outline-offset: 2px;
}
.btn-go:hover { filter: brightness(1.08); }
.btn-nav {
  background: var(--btn-bg);
  min-width: 90px;
  justify-content: center;
}
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* ---------- hidden ---------- */
.hidden { display: none !important; }

/* ---------- visualiser layout ---------- */
.section-intro { margin: 0 0 16px; }
.viz-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: start;
}
@media (max-width: 700px) { .viz-layout { grid-template-columns: 1fr; } }

/* ---------- SVG graph ---------- */
.viz-graph-wrap {
  background: var(--svg-bg);
  border: 3px solid var(--border);
  overflow: hidden;
  position: relative;
  aspect-ratio: 16 / 9;
}
.automaton-svg {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
}

.fit-btn {
  position: absolute;
  bottom: 8px;
  right: 8px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  line-height: 1;
  background: var(--btn-bg);
  color: var(--text);
  border: 2px solid var(--border);
  opacity: 0.55;
  cursor: pointer;
  border-radius: 4px;
  padding: 0;
  transition: opacity 0.15s;
  z-index: 10;
}
.fit-btn:hover, .fit-btn:focus-visible { opacity: 1; outline: 2px solid var(--hot); }

.zoom-hint {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: "Courier New", monospace;
  margin: 0 0 12px;
  opacity: 0.8;
}

/* SVG node styles */
.s-node circle {
  fill: var(--node-fill);
  stroke: var(--node-stroke);
  stroke-width: 2;
}
.s-node text {
  fill: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
}
.s-node.new circle  { stroke: var(--new-color); stroke-width: 3.5; }
.s-node.mod circle  { stroke: var(--mod-color); stroke-width: 3.5; }
.s-node.cur circle  { stroke: var(--hot); stroke-width: 3.5; fill: var(--accent-bg); }

/* SVG edge styles */
.s-edge line, .s-edge path {
  stroke: var(--edge-color);
  stroke-width: 2;
  fill: none;
}
.s-edge text {
  fill: var(--edge-color);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
  font-weight: 700;
}
.s-edge.new line, .s-edge.new path               { stroke: var(--new-color); stroke-width: 2.5; }
.s-edge.mod line, .s-edge.mod path               { stroke: var(--mod-color); stroke-width: 2.5; }
.s-edge.active-trav line, .s-edge.active-trav path { stroke: var(--hot); stroke-width: 3; }
.s-edge.new text         { fill: var(--new-color); }
.s-edge.mod text         { fill: var(--mod-color); }
.s-edge.active-trav text { fill: var(--hot); }

/* ---------- explanation panel ---------- */
.viz-explain {
  width: 260px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
@media (max-width: 700px) { .viz-explain { width: 100%; } }

.step-counter {
  font-family: "Courier New", monospace;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: right;
}
.explain-box {
  background: var(--bg-alt);
  border: 3px solid var(--border);
  padding: 12px;
  min-height: 120px;
  font-size: 0.9rem;
  line-height: 1.5;
}
.explain-box p:first-child { margin-top: 0; }
.explain-box p:last-child  { margin-bottom: 0; }

/* ---------- legend ---------- */
.legend-new {
  color: var(--new-color);
  font-weight: 700;
  font-family: Arial, Helvetica, sans-serif;
}
.legend-mod {
  color: var(--mod-color);
  font-weight: 700;
  font-family: Arial, Helvetica, sans-serif;
}

/* ---------- nav bar ---------- */
.nav-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}
.progress-wrap {
  flex: 1;
  height: 14px;
  background: var(--progress-bg);
  border: 2px solid var(--border);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: var(--progress-fill);
  transition: width 0.25s ease;
}

/* ---------- word track ---------- */
.word-track {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}
.word-track span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  font-family: "Courier New", monospace;
  font-weight: 700;
  font-size: 1rem;
  background: var(--bg-alt);
}

/* ---------- LCS display ---------- */
.lcs-display {
  background: var(--accent-bg);
  border: 2px solid var(--border);
  padding: 8px 12px;
  font-family: "Courier New", monospace;
  font-size: 0.9rem;
}
.lcs-display strong { letter-spacing: 0.12em; }

/* ---------- pseudocode ---------- */
.pseudocode-ref {
  margin-top: 20px;
  border: 3px solid var(--border);
  background: var(--card);
}
.pseudocode-ref summary {
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
  background: var(--bg-alt);
  color: var(--heading);
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
.pseudocode-ref summary::-webkit-details-marker { display: none; }
.pseudocode-ref summary::before {
  content: "▶";
  font-size: 0.7em;
  transition: transform 0.2s;
}
details[open] summary::before { transform: rotate(90deg); }
.pseudocode-ref pre {
  margin: 0;
  padding: 16px;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: "Courier New", Courier, monospace;
  font-size: 0.82rem;
  line-height: 1.6;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ---------- rainbow HR ---------- */
.rainbow-hr {
  border: none;
  height: 5px;
  background: linear-gradient(90deg, red, orange, yellow, green, cyan, blue, violet);
  margin: 0 0 16px;
}

/* ---------- footer ---------- */
.retro-footer {
  text-align: center;
  padding: 12px 16px 24px;
  color: var(--muted);
  font-size: 0.85rem;
  font-family: Arial, Helvetica, sans-serif;
}
.retro-footer p { margin: 4px 0; }

/* ---------- scrollbar (cosmetic) ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-alt); }
::-webkit-scrollbar-thumb { background: var(--border); }

/* ---------- theme toggle ---------- */
.theme-toggle {
  position: fixed;
  top: 10px;
  right: 12px;
  z-index: 9999;
  background: var(--btn-bg);
  color: var(--text);
  padding: 6px 12px;
  font-family: "Comic Neue", "Comic Sans", cursive;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  min-height: 36px;
  min-width: 44px;
  border-top:    2px solid #fff;
  border-left:   2px solid #fff;
  border-bottom: 2px solid #808080;
  border-right:  2px solid #808080;
}
.theme-toggle:focus-visible {
  outline: 3px solid var(--hot);
  outline-offset: 2px;
}