/* ============================================================
   Endianness Visualizer
   Same dark-with-color-coding palette as the memory visualizer
   so the two tools feel like siblings.
   ============================================================ */

:root {
  --bg:         #0f1115;
  --surface:    #181b22;
  --surface-2:  #1f242d;
  --border:     #2a2e38;
  --text:       #e6e8ee;
  --muted:      #8a93a6;
  --accent:     #6ea8ff;
  --accent-2:   #b78bff;

  /* Per-byte colors: low-order on the cool side, high-order on the warm. */
  --byte-0:     #4ea1ff;   /* lowest-significance byte */
  --byte-1:     #38bdf8;
  --byte-2:     #facc15;
  --byte-3:     #fb923c;
  --byte-4:     #ec4899;   /* used for 8-byte (64-bit) sections */
  --byte-5:     #a78bfa;
  --byte-6:     #f87171;
  --byte-7:     #4ade80;   /* highest-significance byte */

  --c-string:   #4ade80;
  --c-int:      #fb923c;
  --c-addr:     #ec4899;
  --c-warn:     #f59e0b;
  --c-ok:       #22c55e;

  --mono: ui-monospace, "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: var(--mono); }
code { background: var(--surface-2); padding: 1px 6px; border-radius: 4px; font-size: 0.9em; }
pre code { background: none; padding: 0; }
em { color: var(--accent); font-style: normal; }

/* ---------- Hero ---------- */
.hero {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #11141b 0%, var(--bg) 100%);
}
.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 56px 32px 36px;
}
.hero h1 {
  font-size: 2.2rem;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}
.lede {
  font-size: 1.02rem;
  color: var(--muted);
  max-width: 780px;
}
.toc {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--mono);
  font-size: 0.88rem;
}
.toc a {
  background: var(--surface);
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

/* ---------- Section frame ---------- */
.scenario {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 32px;
  border-bottom: 1px solid var(--border);
}
.scenario-header h2 {
  margin: 0 0 10px;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
}
.scenario-header p {
  color: var(--muted);
  max-width: 820px;
  margin: 0 0 8px;
}

.scenario-body { margin-top: 24px; }

.viz {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px;
  min-height: 240px;
}

/* ---------- Controls ---------- */
.controls {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 14px;
}
.controls button {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--mono);
  font-size: 1rem;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
}
.controls button:hover:not(:disabled) { background: #262b35; border-color: var(--accent); }
.controls button:active:not(:disabled) { transform: translateY(1px); }
.controls button:disabled { opacity: 0.35; cursor: not-allowed; }
.step-indicator {
  margin-left: auto;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.85rem;
}

.step-status {
  margin-top: 14px;
  font-size: 0.92rem;
  color: var(--text);
  padding: 10px 14px;
  background: var(--surface-2);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  min-height: 60px;
}

/* ---------- Memory-cell grid (used in most sections) ---------- */
.mem-row {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 14px;
  align-items: center;
  margin-bottom: 14px;
  font-family: var(--mono);
}
.mem-label {
  color: var(--muted);
  font-size: 0.85rem;
  text-align: right;
}
.mem-cells {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #0b0d12;
  font-family: var(--mono);
  position: relative;
  transition: background 0.25s, border-color 0.25s, transform 0.2s;
}
.cell.empty {
  background: repeating-linear-gradient(45deg,
    rgba(255,255,255,0.02) 0 6px,
    transparent 6px 12px);
}
.cell.filled {
  animation: cellFill 0.35s ease-out;
}
.cell .cell-addr {
  font-size: 0.65rem;
  color: var(--muted);
  margin-top: -4px;
}
.cell .cell-byte {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.cell .cell-meta {
  font-size: 0.62rem;
  color: var(--muted);
  text-transform: uppercase;
  margin-top: 2px;
  letter-spacing: 0.06em;
}

@keyframes cellFill {
  from { opacity: 0; transform: scale(0.85); }
  to   { opacity: 1; transform: scale(1); }
}

/* Per-byte coloring (cycled by position-from-low) */
.cell.b0 { border-color: var(--byte-0); }
.cell.b1 { border-color: var(--byte-1); }
.cell.b2 { border-color: var(--byte-2); }
.cell.b3 { border-color: var(--byte-3); }
.cell.b4 { border-color: var(--byte-4); }
.cell.b5 { border-color: var(--byte-5); }
.cell.b6 { border-color: var(--byte-6); }
.cell.b7 { border-color: var(--byte-7); }

.cell.b0 .cell-byte { color: var(--byte-0); }
.cell.b1 .cell-byte { color: var(--byte-1); }
.cell.b2 .cell-byte { color: var(--byte-2); }
.cell.b3 .cell-byte { color: var(--byte-3); }
.cell.b4 .cell-byte { color: var(--byte-4); }
.cell.b5 .cell-byte { color: var(--byte-5); }
.cell.b6 .cell-byte { color: var(--byte-6); }
.cell.b7 .cell-byte { color: var(--byte-7); }

.cell.highlight {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* "Value pill" used to show the conceptual integer above its memory */
.value-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: #0b0d12;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.value-pill .pill-label {
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.value-pill .pill-val { color: var(--accent); }

/* Each digit pair of the value gets the same color as its byte cell. */
.value-pill .nb { display: inline-block; }
.value-pill .nb.b0 { color: var(--byte-0); }
.value-pill .nb.b1 { color: var(--byte-1); }
.value-pill .nb.b2 { color: var(--byte-2); }
.value-pill .nb.b3 { color: var(--byte-3); }
.value-pill .nb.b4 { color: var(--byte-4); }
.value-pill .nb.b5 { color: var(--byte-5); }
.value-pill .nb.b6 { color: var(--byte-6); }
.value-pill .nb.b7 { color: var(--byte-7); }

/* ---------- Interpretation rows (section 2) ---------- */
.interpretations {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}
.interpretation {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 14px;
  align-items: center;
  padding: 10px 14px;
  background: #0b0d12;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--mono);
  opacity: 0.35;
  transition: opacity 0.25s, border-color 0.25s;
}
.interpretation.shown { opacity: 1; border-color: var(--accent); }
.interpretation .label { color: var(--muted); font-size: 0.82rem; }
.interpretation .reading {
  font-size: 0.95rem;
  color: var(--text);
  word-break: break-all;
}
.interpretation .reading.string  { color: var(--c-string); }
.interpretation .reading.int-le  { color: var(--c-int); }
.interpretation .reading.int-be  { color: var(--c-addr); }

/* ---------- Side-by-side LE vs BE (section 1) ---------- */
.le-be-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 8px;
}
@media (max-width: 760px) {
  .le-be-grid { grid-template-columns: 1fr; }
}
.le-be-grid .panel {
  background: #0b0d12;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}
.le-be-grid .panel-h {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0 0 12px;
  font-weight: 700;
}
.le-be-grid .panel.active .panel-h { color: var(--accent); }
.le-be-grid .panel.dim { opacity: 0.4; }

/* ---------- Magic numbers table (section 4) ---------- */
.magic-row {
  display: grid;
  grid-template-columns: 130px 1fr 1fr 1fr;
  gap: 12px;
  align-items: center;
  padding: 10px 12px;
  margin-bottom: 8px;
  background: #0b0d12;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 0.88rem;
  opacity: 0.35;
  transition: opacity 0.25s, border-color 0.25s;
}
.magic-row.shown { opacity: 1; border-color: var(--accent); }
.magic-row .name { font-weight: 700; color: var(--text); }
.magic-row .bytes { color: var(--byte-0); letter-spacing: 0.06em; }
.magic-row .ascii { color: var(--c-string); }
.magic-row .as-int { color: var(--c-int); }
.magic-row .col-h {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 2px;
}
.magic-header {
  display: grid;
  grid-template-columns: 130px 1fr 1fr 1fr;
  gap: 12px;
  padding: 0 12px 6px;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 700;
}

/* ---------- Why-LE widening demo (section 5) ---------- */
.widen-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 14px;
  align-items: center;
  margin-bottom: 12px;
}
.widen-label {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
  text-align: right;
}
.widen-value {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--mono);
}
.widen-value .equals {
  color: var(--muted);
  font-size: 0.95rem;
}
.widen-value .int-val {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
}

/* ---------- Footer ---------- */
footer {
  text-align: center;
  padding: 32px 20px 60px;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 20px;
}
footer p { max-width: 820px; margin: 0 auto 10px; }
footer .back-link { font-family: var(--mono); }