/* ════════════════════════════════════════════════════════════════
   Bit Shifting from Scratch · Tutorial-specific styles
   Builds on tutorial.css design tokens.
   ════════════════════════════════════════════════════════════════ */

/* ── Card visual on the home index (mirrored in root style.css) ───── */
.tut-card-visual.bits-bg,
.game-card-visual.bits-bg {
  background:
    radial-gradient(circle at 22% 30%, rgba(167, 139, 250, 0.26), transparent 45%),
    radial-gradient(circle at 78% 70%, rgba(96, 165, 250, 0.22), transparent 45%),
    linear-gradient(135deg, #0c0a1a 0%, #120e22 50%, #0a0e1c 100%);
}

/* ── Rows of bit cells ────────────────────────────────────────────── */
.bit-row {
  display: flex;
  flex-wrap: nowrap;
  gap: 2px;
  justify-content: center;
  align-items: flex-end;
  overflow-x: auto;
  padding: 0.4rem 0.2rem 0.6rem;
  scrollbar-width: thin;
}

.bit-cell {
  position: relative;
  flex: 0 0 auto;
  width: 1.12rem;
  height: 1.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--tut-muted);
  background: var(--tut-bg);
  border: 1px solid var(--tut-border);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s, transform 0.08s;
  padding: 0;
}

.bit-cell .bit-index {
  position: absolute;
  bottom: -0.72rem;
  left: 0; right: 0;
  font-size: 0.46rem;
  font-weight: 500;
  color: var(--tut-muted);
  opacity: 0.55;
  letter-spacing: 0;
  pointer-events: none;
}

.bit-cell.on {
  color: #1a1626;
  background: var(--tut-accent);
  border-color: var(--tut-accent);
}

.bit-cell.sign {
  box-shadow: inset 0 0 0 2px var(--tut-warn);
}

.bit-cell.flash {
  background: var(--tut-info);
  border-color: var(--tut-info);
  color: #08121f;
}

.bit-cell.fxfrac {
  border-bottom: 3px solid var(--tut-info);
}

.bit-cell:not(.ro):hover {
  border-color: var(--tut-accent);
  transform: translateY(-1px);
}

.bit-cell.ro { cursor: default; }
.bit-cell.ro:hover { transform: none; }

.bit-gap { flex: 0 0 0.28rem; }

@media (max-width: 560px) {
  .bit-cell { width: 0.98rem; height: 1.5rem; font-size: 0.7rem; }
  .bit-gap { flex: 0 0 0.2rem; }
  .bit-row { justify-content: flex-start; }
}

/* Square-grid canvases: constrain width so they are not lost in a wide
   letterbox, and center them. */
#widget-bitboard canvas,
#widget-morton canvas {
  display: block;
  max-width: 360px;
  margin-inline: auto;
}

/* ── Generic key/value readouts ───────────────────────────────────── */
.bits-kv {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 0.9rem;
  margin-top: 0.8rem;
  font-size: 0.88rem;
}
.bits-kv dt { color: var(--tut-muted); font-weight: 600; }
.bits-kv dd {
  margin: 0;
  font-family: var(--mono);
  color: var(--tut-text);
  word-break: break-all;
}
.bits-msg {
  margin-top: 0.7rem;
  font-size: 0.85rem;
  color: var(--tut-soft);
  line-height: 1.5;
}
.ok  { color: var(--tut-success); font-weight: 600; }
.bad { color: var(--tut-danger);  font-weight: 600; }

/* ── §5 Strength-reduction disassembler ───────────────────────────── */
.sr-asm {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  background: var(--tut-code-bg);
  border: 1px solid var(--tut-code-border);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  white-space: pre;
  overflow-x: auto;
  color: #d6d6e6;
  margin-top: 0.7rem;
  min-height: 5.5rem;
}
.sr-note {
  margin-top: 0.7rem;
  font-size: 0.86rem;
  color: var(--tut-soft);
  line-height: 1.55;
}
.sr-note code { font-family: var(--mono); color: var(--tut-accent); }

/* ── §7 Count-masking demo ────────────────────────────────────────── */
.cm-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
  margin-top: 0.8rem;
}
@media (max-width: 560px) { .cm-cols { grid-template-columns: 1fr; } }
.cm-col {
  background: var(--tut-bg);
  border: 1px solid var(--tut-border);
  border-radius: 8px;
  padding: 0.7rem 0.8rem;
}
.cm-col h4 {
  margin: 0 0 0.35rem;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--tut-muted);
}
.cm-result {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--tut-text);
}
.cm-result.bad { color: var(--tut-danger); font-weight: 700; }
.cm-col small { color: var(--tut-muted); font-size: 0.72rem; }
.cm-warn {
  margin-top: 0.7rem;
  color: var(--tut-danger);
  font-size: 0.85rem;
  font-weight: 600;
}

/* ── §10 Collision-mask matrix ────────────────────────────────────── */
.col-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.6rem;
}
@media (max-width: 560px) { .col-grid { grid-template-columns: 1fr; } }
.col-entity {
  background: var(--tut-bg);
  border: 1px solid var(--tut-border);
  border-radius: 8px;
  padding: 0.75rem 0.85rem;
}
.col-entity h4 { margin: 0 0 0.5rem; font-size: 0.95rem; color: var(--tut-text); }
.col-entity .col-sub {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--tut-muted);
  margin: 0.55rem 0 0.3rem;
}
.layer-row { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.layer-chip {
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--tut-border);
  background: var(--tut-surface);
  color: var(--tut-muted);
  cursor: pointer;
  transition: all 0.12s;
}
.layer-chip:hover { border-color: var(--tut-accent); color: var(--tut-soft); }
.layer-chip.on {
  background: var(--tut-accent);
  border-color: var(--tut-accent);
  color: #1a1626;
  font-weight: 600;
}
.col-bits { font-family: var(--mono); font-size: 0.78rem; color: var(--tut-soft); margin-top: 0.35rem; }
.col-calc {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--tut-soft);
  margin-top: 0.8rem;
  line-height: 1.7;
  word-break: break-word;
}
.col-verdict {
  margin-top: 0.8rem;
  text-align: center;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  padding: 0.6rem;
  border-radius: 8px;
}
.col-verdict.hit  { background: rgba(52, 211, 153, 0.14); color: var(--tut-success); border: 1px solid rgba(52,211,153,0.4); }
.col-verdict.miss { background: rgba(248, 113, 113, 0.12); color: var(--tut-danger); border: 1px solid rgba(248,113,113,0.35); }

/* ── §11 Color packer ─────────────────────────────────────────────── */
.cp-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 1.1rem; margin-top: 0.5rem; }
@media (max-width: 600px) { .cp-grid { grid-template-columns: 1fr; } }
.cp-sliders .control-row { margin-bottom: 0.4rem; }
.cp-swatches { display: flex; gap: 0.8rem; align-items: center; justify-content: center; margin: 0.4rem 0 0.8rem; }
.cp-swatch {
  width: 70px; height: 70px; border-radius: 10px;
  border: 1px solid var(--tut-border);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.05);
}
.cp-swatch-label { font-size: 0.66rem; color: var(--tut-muted); text-align: center; margin-top: 0.25rem; text-transform: uppercase; letter-spacing: 0.05em; }
.cp-layout { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.5rem; }
.chan {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.25rem 0.5rem;
  border-radius: 5px;
  color: #0c0c14;
  font-weight: 600;
}
.chan-r { background: rgba(248, 113, 113, 0.85); }
.chan-g { background: rgba(52, 211, 153, 0.85); }
.chan-b { background: rgba(96, 165, 250, 0.85); }
.chan-a { background: rgba(190, 190, 205, 0.85); }
.cp-loss { font-size: 0.76rem; color: var(--tut-muted); margin-top: 0.5rem; font-family: var(--mono); }

/* ── §12 Morton interleave bits ───────────────────────────────────── */
.mz-interleave { display: inline-flex; gap: 3px; margin-left: 0.3rem; }
.mz-bit {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.85rem;
  width: 1.3rem; height: 1.6rem;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 4px;
}
.mz-x { background: rgba(96, 165, 250, 0.22); color: var(--tut-info); border: 1px solid rgba(96,165,250,0.45); }
.mz-y { background: rgba(248, 113, 113, 0.18); color: var(--tut-danger); border: 1px solid rgba(248,113,113,0.4); }
.mz-legend { font-size: 0.74rem; color: var(--tut-muted); margin-top: 0.5rem; }
.mz-legend .mz-x, .mz-legend .mz-y { width: auto; height: auto; padding: 0 0.3rem; display: inline; border: none; }

/* ── §14 Float-bits dissector ─────────────────────────────────────── */
.fb-bits { display: flex; flex-wrap: wrap; gap: 2px; justify-content: center; margin: 0.5rem 0; }
.fb-cell {
  font-family: var(--mono);
  font-size: 0.78rem;
  width: 1.15rem; height: 1.5rem;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 3px;
  border: 1px solid var(--tut-border);
  background: var(--tut-bg);
  color: var(--tut-muted);
}
.fb-cell.on { color: #fff; }
.fb-sign.on { background: rgba(251, 191, 36, 0.8); border-color: var(--tut-warn); color: #1a1400; }
.fb-exp.on  { background: rgba(96, 165, 250, 0.75); border-color: var(--tut-info); color: #06101f; }
.fb-mant.on { background: rgba(167, 139, 250, 0.72); border-color: var(--tut-accent); color: #15102a; }
.fb-sign { box-shadow: inset 0 -3px 0 rgba(251,191,36,0.45); }
.fb-exp  { box-shadow: inset 0 -3px 0 rgba(96,165,250,0.4); }
.fb-mant { box-shadow: inset 0 -3px 0 rgba(167,139,250,0.35); }
.fb-divider { flex: 0 0 0.4rem; }
.fb-legend { display: flex; gap: 0.9rem; justify-content: center; font-size: 0.7rem; color: var(--tut-muted); margin-top: 0.2rem; flex-wrap: wrap; }
.fb-legend span::before { content: '■ '; }
.fb-legend .lg-sign::before { color: var(--tut-warn); }
.fb-legend .lg-exp::before  { color: var(--tut-info); }
.fb-legend .lg-mant::before { color: var(--tut-accent); }
.fb-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.6rem;
  margin-top: 0.7rem;
}

/* ── Misc layout helpers ──────────────────────────────────────────── */
.widget-twocol {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: start;
}
@media (max-width: 600px) { .widget-twocol { grid-template-columns: 1fr; } }

.mono-strong { font-family: var(--mono); color: var(--tut-text); font-weight: 600; }
.pop-methods {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
  margin-top: 0.7rem;
}
@media (max-width: 560px) { .pop-methods { grid-template-columns: 1fr; } }
.pop-method {
  background: var(--tut-bg);
  border: 1px solid var(--tut-border);
  border-radius: 8px;
  padding: 0.6rem 0.7rem;
  text-align: center;
}
.pop-method h4 { margin: 0 0 0.3rem; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--tut-muted); }
.pop-method .pop-val { font-family: var(--mono); font-size: 0.95rem; color: var(--tut-accent); font-weight: 700; }