/* Formula Lab — page-specific styles */

/*
 * The canvas animations in js/viz.js read their colours from these, so they
 * always match the page instead of carrying their own hard-coded palette.
 */
:root {
  --ink: var(--color-text);
  --ink-soft: var(--color-text-muted);
  --surface: var(--color-bg-alt);
  --surface-2: var(--color-bg);
  --line: #e8e2d8;
  --line-strong: #d8cfc2;
  --hot: #e8553a;
  --cool: #0f8f86;
  --good: #16a34a;
  --a: #7c3aed;

  --s-physics: #0f8f86;
  --s-chemistry: #7c3aed;
  --s-math: #16a34a;
  --s-engineering: #d1660b;
  --s-space: #4054b2;
}

.fx-page { max-width: 1200px; }

/* ---------- search bar ---------- */
.fx-search { margin-bottom: 1rem; }

.fx-searchrow { display: flex; gap: 0.6rem; }

#q {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-body);
  font-size: 1.05rem;
  padding: 0.7rem 1rem;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
}
#q::placeholder { color: var(--color-text-muted); }
#q:focus { outline: none; border-color: var(--color-sky); background: var(--color-bg-alt); }

.fx-chips { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 0.85rem; }

.fx-chip {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.4rem 0.95rem;
  border: 2px solid var(--line);
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.fx-chip:hover, .fx-chip:focus-visible { border-color: var(--color-sky); color: var(--color-text); outline: none; }
.fx-chip[aria-pressed="true"] { background: var(--color-purple); border-color: var(--color-purple); color: #fff; }

.fx-count {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.75rem;
}

/* ---------- layout ---------- */
.fx-layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 1.25rem;
  align-items: start;
}

.fx-detail-col { display: flex; flex-direction: column; gap: 1.25rem; min-width: 0; }

/* ---------- the list ---------- */
.fx-list {
  padding: 0;
  overflow: hidden;
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  display: flex;
  flex-direction: column;
}
.fx-list-scroll { overflow-y: auto; }

.fx-group {
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 0.5rem 1rem;
  background: var(--color-bg);
  border-bottom: 2px solid var(--line);
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.fx-item {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: none;
  padding: 0.6rem 1rem;
  cursor: pointer;
  font-family: var(--font-body);
  color: var(--color-text);
}
.fx-item:hover { background: var(--color-bg); }
.fx-item[aria-current="true"] { background: var(--color-bg); box-shadow: inset 4px 0 0 var(--color-purple); }
.fx-item b { display: block; font-family: var(--font-display); font-size: 0.95rem; font-weight: 600; }
.fx-item span {
  display: block;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.1rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.fx-noresults { padding: 1.2rem 1rem; color: var(--color-text-muted); }

/* ---------- the card ---------- */
.fx-detail { --sub-color: var(--color-sky-dark); }

.fx-tagrow { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 0.5rem; }
.fx-tag {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--sub-color);
}
.fx-age {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border: 2px solid var(--line);
  border-radius: 999px;
  padding: 0.05rem 0.6rem;
}

.fx-detail h1 {
  font-family: var(--font-display);
  font-size: 1.9rem;
  line-height: 1.15;
  margin-bottom: 0.35rem;
}
.fx-lede { font-size: 1.05rem; color: var(--color-text-muted); margin-bottom: 1.1rem; max-width: 60ch; }

.fx-formula {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: clamp(1.15rem, 3.2vw, 1.7rem);
  font-weight: 700;
  background: var(--color-bg);
  border: 2px solid var(--line);
  border-left: 6px solid var(--sub-color);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  margin-bottom: 1.2rem;
  overflow-x: auto;
  white-space: nowrap;
}

.fx-sec { margin-top: 1.3rem; }
.fx-sec h2 {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.6rem;
}

.fx-viz {
  display: block;
  width: 100%;
  height: 215px;
  background: var(--color-bg);
  border: 2px solid var(--line);
  border-radius: var(--radius-sm);
}

/* what each part means */
.fx-parts {
  display: flex;
  flex-direction: column;
  border: 2px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.fx-part {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.5rem 0.9rem;
  border-bottom: 1px solid var(--line);
}
.fx-part:last-child { border-bottom: 0; }
.fx-part code { font-family: "JetBrains Mono", monospace; font-weight: 700; font-size: 1rem; color: var(--sub-color); }
.fx-unit { font-family: "JetBrains Mono", monospace; font-size: 0.8rem; color: var(--color-text-muted); }

/* calculator */
.fx-calc { border: 2px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.fx-calc-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  min-width: 0;
  padding: 0.7rem 0.9rem;
  background: var(--color-bg);
  border-bottom: 2px solid var(--line);
}
.fx-calc-head label { font-family: var(--font-display); font-size: 0.85rem; font-weight: 600; color: var(--color-text-muted); }
.fx-calc select {
  font-family: var(--font-display);
  font-weight: 600;
  max-width: 100%;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--color-bg-alt);
  color: var(--color-text);
  padding: 0.35rem 0.6rem;
}

.fx-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  gap: 0.85rem;
  padding: 0.9rem;
}
.fx-field { display: flex; flex-direction: column; gap: 0.3rem; min-width: 0; }
.fx-field label { font-size: 0.82rem; font-weight: 700; color: var(--color-text-muted); }
.fx-field label em { font-style: normal; font-family: "JetBrains Mono", monospace; color: var(--color-text); }
.fx-field input {
  width: 100%;
  font-family: "JetBrains Mono", monospace;
  font-size: 1rem;
  padding: 0.5rem 0.6rem;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--color-bg-alt);
  color: var(--color-text);
}
.fx-field input:focus { outline: none; border-color: var(--color-sky); }

.fx-result {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
  padding: 0.9rem;
  border-top: 2px solid var(--line);
  background: var(--color-bg);
}
.fx-val {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: #16a34a;
  font-variant-numeric: tabular-nums;
  word-break: break-all;
}
.fx-lab { font-size: 0.85rem; font-weight: 700; color: var(--color-text-muted); }

.fx-note {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  background: var(--color-bg);
  border: 2px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
  overflow-x: auto;
}
.fx-why {
  background: var(--color-bg);
  border: 2px solid var(--line);
  border-left: 6px solid var(--color-sun);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
  max-width: 66ch;
}

/* constants drawer */
.fx-constants { padding: 0; }
.fx-constants summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  padding: 0.9rem 1.2rem;
}
.fx-ctable {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 0.6rem;
  padding: 0 1.2rem 1.2rem;
}
.fx-ctable div { font-size: 0.9rem; }
.fx-ctable code { font-family: "JetBrains Mono", monospace; font-weight: 700; color: var(--color-sky-dark); }

.fx-back { display: none; align-self: flex-start; }

/* ---------- small screens ---------- */
@media (max-width: 900px) {
  .fx-layout { grid-template-columns: minmax(0, 1fr); }
  .fx-list { position: static; max-height: none; }
  body.viewing .fx-list { display: none; }
  body:not(.viewing) .fx-detail-col { display: none; }
  .fx-back { display: inline-block; }
  .fx-viz { height: 190px; }
  .fx-part { grid-template-columns: 3.6rem minmax(0, 1fr); }
  .fx-unit { grid-column: 2; }
  .fx-detail h1 { font-size: 1.5rem; }
}

@media print {
  .fx-search, .fx-list, .fx-back, .fx-calc-head, .fx-constants, .game-back { display: none !important; }
  .fx-layout { display: block; }
}

@media (prefers-reduced-motion: reduce) {
  .fx-chip, .fx-item, #q { transition: none !important; }
}