/* Stroustrup's zero-overhead principle. Write a vector sum the expressive way or
   the hand-tuned way; the C++ compiler emits the same tight machine code. You never
   trade clarity for speed: what you don't use you don't pay for, and what you do use
   you couldn't hand-code better. Vanilla JS, no deps, no build. Dark theme.
   Palette shared with siblings: green = identical/free (the win), white = primary. No red. */

#zero-overhead {
  --zo-same: #30d158;                /* identical output — the win */
  --zo-hl: #5ac8fa;
  font-family: var(--font-family, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif);
  background: var(--color-bg-elevated, #111111);
  border: 1px solid var(--color-border, rgba(255, 255, 255, 0.1));
  border-radius: 16px;
  padding: clamp(16px, 3vw, 26px);
  margin: 2.5rem 0;
  color: var(--color-text-primary, #ffffff);
}

.zo-title { font-size: 1rem; font-weight: 650; letter-spacing: -0.01em; }
.zo-explain {
  font-size: 0.9rem; line-height: 1.55; margin: 8px 0 16px;
  color: var(--color-text-secondary, rgba(255, 255, 255, 0.7));
}

/* source style toggle */
.zo-modes { display: inline-flex; gap: 4px; padding: 4px; border-radius: 10px;
  background: var(--color-bg-surface, #1a1a1a); margin-bottom: 16px; flex-wrap: wrap; }
.zo-mode {
  appearance: none; cursor: pointer; font: inherit; font-size: 0.82rem; font-weight: 600;
  border: 0; background: transparent; color: var(--color-text-secondary, rgba(255,255,255,0.55));
  padding: 7px 14px; border-radius: 7px; transition: color 0.18s, background 0.18s;
}
.zo-mode:hover { color: var(--color-text-primary, #fff); }
.zo-mode.is-on { color: #0b0b0b; background: var(--color-accent, #fff); }

.zo-grid { display: grid; grid-template-columns: 1fr; gap: 14px; align-items: start; }
@media (min-width: 580px) { .zo-grid { grid-template-columns: 1fr 1fr; } }

.zo-pane-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--color-text-tertiary, rgba(255,255,255,0.42)); margin: 0 0 7px; display: flex; align-items: center; gap: 8px; }
.zo-pane {
  font-family: var(--font-mono, "SF Mono", Monaco, monospace); font-size: 0.78rem; line-height: 1.65;
  background: #0c0c0f; border: 1px solid var(--color-border-subtle, rgba(255,255,255,0.08));
  border-radius: 9px; padding: 14px; white-space: pre; overflow-x: auto; color: #c8c8cc;
  min-height: 150px; transition: border-color 0.3s;
}
.zo-asm.flash { border-color: var(--zo-same); }
.zo-cmt { color: rgba(255,255,255,0.34); }
.zo-kw { color: #c98fff; }
.zo-fn { color: var(--zo-hl); }

.zo-badge {
  display: inline-flex; align-items: center; gap: 5px; font-size: 0.7rem; font-weight: 700;
  background: rgba(48,209,88,0.16); color: var(--zo-same); padding: 2px 9px; border-radius: 999px;
  text-transform: none; letter-spacing: 0; transform-origin: left center;
}
.zo-badge.pulse { animation: zo-badgepulse 0.7s ease; }
@keyframes zo-badgepulse {
  0% { transform: scale(1); }
  25% { transform: scale(1.12); background: var(--zo-same); color: #0b0b0b; }
  100% { transform: scale(1); }
}
@media (prefers-reduced-motion: reduce) { .zo-badge.pulse { animation: none; } }

.zo-readout {
  margin-top: 16px; font-size: 0.9rem; line-height: 1.55;
  color: var(--color-text-secondary, rgba(255,255,255,0.78));
}
.zo-readout b { color: #fff; }
.zo-readout .zo-hl-same { color: var(--zo-same); font-weight: 650; }

.zo-noscript { font-size: 0.9rem; color: var(--color-text-secondary, rgba(255,255,255,0.65)); line-height: 1.6; }