/* ── BUFFALO RECURSION MACHINE ─────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0a0d12;
  --bg-2:      #11161e;
  --surface:   #161c26;
  --line:      #2a3340;
  --line-soft: #1c232e;
  --ink:       #ecead6;
  --ink-dim:   #b6b39c;
  --muted:     #6b7382;

  /* role colors — ink-stamp palette */
  --c-city:   #6ec1ff;   /* place / proper noun */
  --c-noun:   #f5b840;   /* the bison */
  --c-vrel:   #d96b6b;   /* embedded verb */
  --c-vmain:  #ff7a55;   /* main verb, hotter */

  --brk:      #3f4a5e;
  --brk-hot:  #7dd3e8;

  --shadow:   0 1px 0 rgba(255,255,255,.04), 0 14px 40px rgba(0,0,0,.4);
}

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(1100px 700px at 80% -10%, rgba(110,193,255,.06), transparent 60%),
    radial-gradient(900px 600px at 10% 110%, rgba(245,184,64,.05), transparent 65%),
    var(--bg);
  color: var(--ink);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-weight: 300;
  min-height: 100vh;
  padding: 32px 40px 120px;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(125,211,232,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125,211,232,.025) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
  z-index: 0;
}

/* keep content above grid */
body > * { position: relative; z-index: 1; }

/* ── TOP BAR ───────────────────────────────────────────────────────────── */

.topbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line-soft);
  margin-bottom: 36px;
}

.eyebrow,
.metric-k,
.translate-eyebrow,
.legend-eyebrow,
.hint {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--muted);
}

.title {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-weight: 500;
  font-size: 30px;
  letter-spacing: .04em;
  margin-top: 4px;
  color: var(--ink);
}

.subtitle {
  font-size: 14px;
  margin-top: 6px;
  color: var(--ink-dim);
  font-style: italic;
}

.metrics {
  display: flex;
  gap: 28px;
  align-items: flex-end;
}

.metric { display: flex; flex-direction: column; gap: 4px; min-width: 60px; }

.metric-v {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 20px;
  font-weight: 500;
  color: var(--ink);
  display: flex; gap: 6px; align-items: center;
}

.mode-btn {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  font: inherit;
  font-size: 11px;
  padding: 4px 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all .15s;
}
.mode-btn:hover { color: var(--ink); border-color: var(--brk-hot); }
.mode-btn.is-on { color: var(--bg); background: var(--ink); border-color: var(--ink); }

/* ── STAGE ─────────────────────────────────────────────────────────────── */

.stage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.sentence-wrap {
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  padding: 40px 36px 22px;
  box-shadow: var(--shadow);
}

.sentence {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 22px;
  font-weight: 400;
  line-height: 2;
  letter-spacing: .01em;
  color: var(--ink);
  word-spacing: .15em;
  cursor: default;
}

/* tokens are inline so the line wraps naturally */
.tok {
  display: inline;
  padding: 2px 4px;
  margin: 0 1px;
  border-radius: 2px;
  cursor: pointer;
  transition: background .12s, color .12s;
}

.tok--city  { color: var(--c-city);  }
.tok--noun  { color: var(--c-noun);  }
.tok--verb-rel  { color: var(--c-vrel);  font-style: italic; }
.tok--verb-main { color: var(--c-vmain); font-weight: 500; }

.tok--verb-main { cursor: default; }
.tok--verb-main:hover { background: transparent; }

.tok:hover { background: rgba(125,211,232,.08); }

/* brackets — thin square brackets that flow with text */
.brk {
  display: inline;
  color: var(--brk);
  font-family: inherit;
  margin: 0 1px;
  cursor: pointer;
  transition: color .12s;
  user-select: none;
}
.brk:hover { color: var(--brk-hot); }

/* collapse × tucked next to the closing bracket on rel NPs */
.brk-x {
  display: inline-block;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  line-height: 12px;
  text-align: center;
  margin: 0 2px 0 0;
  vertical-align: 2px;
  cursor: pointer;
  transition: all .12s;
  opacity: 0;
}
.np-block:hover .brk-x,
.brk-x:hover { opacity: 1; }
.brk-x:hover { color: var(--c-vrel); border-color: var(--c-vrel); }

/* highlight: when hovering a token, illuminate all tokens of same NP */
.tok.is-hl,
.brk.is-hl {
  background: rgba(125,211,232,.12);
  color: var(--ink);
}
.brk.is-hl { color: var(--brk-hot); }
.tok.is-hl.tok--city  { color: var(--c-city); }
.tok.is-hl.tok--noun  { color: var(--c-noun); }
.tok.is-hl.tok--verb-rel { color: var(--c-vrel); }

.hint {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px dashed var(--line-soft);
}
kbd {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 1px 5px;
  color: var(--ink-dim);
  background: var(--surface);
}

/* ── TRANSLATION ───────────────────────────────────────────────────────── */

.translate-wrap {
  background: transparent;
  padding: 0 4px;
}

.translate {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  font-style: italic;
  color: var(--ink-dim);
  margin-top: 10px;
  max-width: 78ch;
  transition: opacity .2s;
}

.translate-local {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--brk-hot);
  margin-top: 14px;
  min-height: 18px;
  opacity: 0;
  transition: opacity .15s;
}
.translate-local.is-on { opacity: 1; }

/* ── LEGEND ────────────────────────────────────────────────────────────── */

.legend {
  position: fixed;
  right: 28px;
  bottom: 90px;
  background: rgba(17,22,30,.92);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  padding: 14px 16px;
  width: 280px;
  z-index: 5;
  backdrop-filter: blur(6px);
  font-size: 12px;
  color: var(--ink-dim);
}
.legend-eyebrow { margin-bottom: 8px; }
.legend-row {
  display: flex; align-items: center; gap: 8px;
  margin: 5px 0;
  line-height: 1.3;
}
.legend-buffalo[hidden],
.legend-fish[hidden] { display: none; }
.legend-row b { font-weight: 500; font-family: 'JetBrains Mono', monospace; }
.lk-city  { color: var(--c-city); }
.lk-noun  { color: var(--c-noun); }
.lk-vrel  { color: var(--c-vrel); }
.lk-vmain { color: var(--c-vmain); }

/* ── CONTROLS ──────────────────────────────────────────────────────────── */

.controls {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  align-items: center;
  background: rgba(10,13,18,.92);
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  padding: 8px 12px;
  z-index: 6;
  backdrop-filter: blur(6px);
}

.ctl {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-dim);
  background: transparent;
  border: 1px solid transparent;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: all .12s;
}
.ctl:hover { color: var(--ink); border-color: var(--line); }
.ctl:active { background: var(--surface); }
.ctl-sep {
  width: 1px; height: 18px;
  background: var(--line-soft);
  margin: 0 4px;
}

/* ── FOOTNOTE ──────────────────────────────────────────────────────────── */

.footnote {
  margin-top: 64px;
  max-width: 70ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-dim);
}
.footnote p + p { margin-top: 10px; }
.footnote em { color: var(--ink); font-style: italic; }
.footnote .dim { color: var(--muted); font-size: 12px; }
.footnote code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--c-noun);
}

/* ── RESPONSIVE ────────────────────────────────────────────────────────── */

@media (max-width: 900px) {
  body { padding: 20px 18px 140px; }
  .topbar { flex-direction: column; align-items: flex-start; gap: 18px; }
  .sentence { font-size: 18px; }
  .legend {
    position: static;
    width: auto;
    margin-top: 28px;
  }
}