/* =========================================================================
   Formula index — the search page across all labs.
   Layout and components come from kit.css; this is the page's own identity
   plus the result list, which no lab has.
   ========================================================================= */
:root {
  --bp-bg: #0d1117;
  --bp-bg2: #11161f;
  --bp-panel: #151b26;
  --bp-panel2: #1d2534;
  --bp-line: #263041;
  --bp-line2: #37455c;
  --bp-ink: #e3e9f2;
  --bp-ink-dim: #93a1b5;
  --bp-cyan: #7cc9ff;
  --bp-blue: #7cc9ff;
  --bp-amber: #ffc55c;
  --bp-red: #ff6f8b;
  --bp-green: #5fe3a1;
  --bp-violet: #b197fc;

  --page-max: 1100px;
}

/* A faint square grid — the common denominator of the four lab backgrounds. */
body {
  background-image:
    linear-gradient(rgba(124, 201, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 201, 255, 0.035) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
}

.hub-intro { max-width: 640px; margin: 1.6rem auto 1.4rem; text-align: center; }
.hub-intro h1 { font-size: 1.9rem; letter-spacing: 0.01em; margin-bottom: 0.6rem; }
.hub-intro p { color: var(--bp-ink-dim); line-height: 1.65; font-size: 0.95rem; }

/* ------------------------------- Search ------------------------------- */
.search-wrap { position: relative; max-width: 640px; margin: 0 auto 0.9rem; }
.search-wrap input {
  width: 100%; font-family: var(--mono); font-size: 1.02rem;
  padding: 0.8rem 4.5rem 0.8rem 1rem;
  background: var(--bp-bg); color: var(--bp-ink);
  border: 1px solid var(--bp-line2); border-radius: 10px;
  transition: border-color 0.2s;
}
.search-wrap input:focus { outline: none; border-color: var(--bp-cyan); }
.search-wrap input::-webkit-search-cancel-button { filter: invert(0.6); }
.search-count {
  position: absolute; right: 0.9rem; top: 50%; transform: translateY(-50%);
  font-family: var(--mono); font-size: 0.75rem; color: var(--bp-ink-dim);
  pointer-events: none;
}

.chip-row { display: flex; gap: 0.4rem; flex-wrap: wrap; justify-content: center; margin-bottom: 1.6rem; }
.chip {
  font-family: var(--mono); font-size: 0.75rem; padding: 0.3rem 0.75rem;
  background: transparent; color: var(--bp-ink-dim);
  border: 1px solid var(--bp-line); border-radius: 20px; cursor: pointer; transition: 0.18s;
}
.chip:hover { color: var(--bp-ink); border-color: var(--bp-line2); }
.chip.active { color: var(--bp-bg); font-weight: 600; }

/* ------------------------------- Results ------------------------------- */
.results { display: flex; flex-direction: column; gap: 1.6rem; }
.res-group h2 {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--bp-ink-dim); margin-bottom: 0.7rem; font-weight: 600;
}
.res-group h2 span { color: var(--bp-line2); font-family: var(--mono); }

.fcard {
  display: grid; grid-template-columns: 148px 1fr; gap: 0 1rem;
  background: linear-gradient(180deg, var(--bp-panel), var(--bp-bg2));
  border: 1px solid var(--bp-line); border-left: 3px solid var(--lab, var(--bp-cyan));
  border-radius: var(--radius); padding: 0.8rem 1rem; margin-bottom: 0.6rem;
}
.fcard .f-sym {
  font-family: var(--mono); font-size: 1.02rem; font-weight: 700; color: var(--lab, var(--bp-cyan));
  word-break: break-word;
}
.fcard .f-where { font-size: 0.7rem; color: var(--bp-ink-dim); margin-top: 0.2rem; line-height: 1.5; }
.fcard .f-where b { color: var(--lab, var(--bp-cyan)); font-weight: 600; }
.fcard .f-name { font-size: 0.9rem; margin-bottom: 0.4rem; }
.fcard .f-expr {
  font-family: var(--mono); font-size: 0.92rem; color: var(--bp-ink);
  background: var(--bp-bg); border: 1px solid var(--bp-line2); border-radius: 7px;
  padding: 0.5rem 0.7rem; overflow-x: auto; white-space: pre-wrap; line-height: 1.7;
}
.fcard .f-meta {
  display: flex; gap: 0.9rem; flex-wrap: wrap; align-items: center;
  font-size: 0.73rem; color: var(--bp-ink-dim); margin-top: 0.45rem;
}
.fcard .f-units { font-family: var(--mono); }
.fcard .f-src { font-style: italic; }
.fcard .f-links { margin-left: auto; display: flex; gap: 0.4rem; }
.fcard a.f-go {
  font-family: var(--mono); font-size: 0.73rem; text-decoration: none;
  padding: 0.25rem 0.6rem; border-radius: 6px; transition: 0.18s;
  color: var(--lab, var(--bp-cyan)); border: 1px solid var(--bp-line2);
}
.fcard a.f-go:hover { border-color: var(--lab, var(--bp-cyan)); background: rgba(255, 255, 255, 0.04); }

.ccard {
  display: block; text-decoration: none; color: inherit;
  background: linear-gradient(180deg, var(--bp-panel), var(--bp-bg2));
  border: 1px solid var(--bp-line); border-left: 3px solid var(--lab, var(--bp-cyan));
  border-radius: var(--radius); padding: 0.7rem 1rem; margin-bottom: 0.5rem; transition: 0.18s;
}
.ccard:hover { border-color: var(--bp-line2); border-left-color: var(--lab, var(--bp-cyan)); }
.ccard .c-head { display: flex; align-items: baseline; gap: 0.55rem; flex-wrap: wrap; }
.ccard .c-lab { font-family: var(--mono); font-size: 0.72rem; color: var(--lab, var(--bp-cyan)); font-weight: 600; }
.ccard .c-num { font-family: var(--mono); font-size: 0.7rem; color: var(--bp-ink-dim); }
.ccard .c-title { font-size: 0.95rem; font-weight: 600; }
.ccard .c-snip { font-size: 0.82rem; color: var(--bp-ink-dim); line-height: 1.6; margin-top: 0.35rem; }
.ccard .c-tags { font-family: var(--mono); font-size: 0.68rem; color: var(--bp-ink-dim); margin-top: 0.35rem; }

mark { background: color-mix(in srgb, var(--bp-amber) 30%, transparent); color: inherit; border-radius: 2px; padding: 0 0.1em; }

.hub-empty { text-align: center; color: var(--bp-ink-dim); padding: 2.5rem 1rem; line-height: 1.7; }
.hub-empty b { color: var(--bp-ink); }

@media (max-width: 640px) {
  .fcard { grid-template-columns: 1fr; gap: 0.5rem; }
  .fcard .f-links { margin-left: 0; }
  .hub-intro h1 { font-size: 1.5rem; }
}