/* ============================================================
   cpu.css — CPU & Assembly Visualizer
   Primitive (panel, seg, ghost-btn) in lab.css.
   ============================================================ */

.examples-inline { flex: 1; align-items: flex-start; }
.examples { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.example-chip {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 100px;
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.example-chip:hover { border-color: var(--accent); color: var(--accent); }

.cpu-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 1.25rem;
  align-items: start;
}
.cpu-grid > * { min-width: 0; }
@media (max-width: 900px) { .cpu-grid { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Editor / listing ---------- */
.code-edit, .code-listing {
  width: 100%;
  min-height: 280px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-sunk);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.7;
  padding: 0.9rem 1rem;
}
.code-edit { resize: vertical; outline: none; tab-size: 4; white-space: pre; }
.code-edit:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-wash); }

.code-listing { overflow: auto; counter-reset: ln; }
.code-listing .row {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem;
  padding: 0 0.3rem;
  border-radius: 5px;
  white-space: pre;
}
.code-listing .ln { color: var(--ink-faint); text-align: right; user-select: none; font-size: 0.78rem; }
.code-listing .src { color: var(--ink); }
.code-listing .row.label .src { color: var(--c-ip, var(--accent)); }
.code-listing .row.comment .src { color: var(--ink-faint); font-style: italic; }
.code-listing .row.current {
  background: var(--accent);
}
.code-listing .row.current .ln,
.code-listing .row.current .src { color: var(--accent-ink); }
.code-listing .row.halt-here { background: color-mix(in srgb, #3fae6b 22%, transparent); }

.code-bar {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
  margin-top: 0.9rem;
}
.run-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-sans); font-size: 0.9rem; font-weight: 500;
  padding: 0.55rem 1.05rem;
  border: 1px solid var(--accent); border-radius: 100px;
  background: var(--accent); color: var(--accent-ink); cursor: pointer;
  transition: transform 0.15s var(--ease);
}
.run-btn:hover:not(:disabled) { transform: translateY(-1px); }
.run-btn:disabled { opacity: 0.5; cursor: default; }
.code-status {
  font-family: var(--font-mono); font-size: 0.76rem;
  color: var(--ink-soft); margin-left: auto;
}
.code-status.err { color: #e0533d; }
.code-status.ok { color: #3fae6b; }

/* ---------- Stato CPU ---------- */
.state-block { margin-bottom: 1.4rem; }
.state-block:last-child { margin-bottom: 0; }
.state-label {
  display: block;
  font-family: var(--font-mono); font-size: 0.7rem;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--ink-faint); margin-bottom: 0.6rem;
}

.registers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem;
}
.reg {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.4rem 0.6rem;
  background: var(--bg);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}
.reg-name { font-family: var(--font-mono); font-size: 0.74rem; color: var(--accent); font-weight: 600; }
.reg-val { font-family: var(--font-mono); font-size: 0.82rem; color: var(--ink); }
.reg-hex { font-family: var(--font-mono); font-size: 0.64rem; color: var(--ink-faint); }
.reg.changed { border-color: var(--accent); background: var(--accent-wash); }
.reg.pc { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: baseline; }
.reg.pc .reg-name { color: #c98a1b; }

.flags { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.flag {
  font-family: var(--font-mono); font-size: 0.78rem;
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg);
}
.flag b { color: var(--ink-soft); }
.flag .v { color: var(--ink); font-weight: 600; }
.flag.on .v { color: var(--accent); }
.flag.changed { border-color: var(--accent); background: var(--accent-wash); }

.memory { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.4rem; }
.mem-cell {
  border: 1px solid var(--line); border-radius: 7px;
  padding: 0.35rem; text-align: center; background: var(--bg);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}
.mem-addr { font-family: var(--font-mono); font-size: 0.6rem; color: var(--ink-faint); }
.mem-val { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink); }
.mem-cell.changed { border-color: var(--accent); background: var(--accent-wash); }

/* ---------- Riferimento ---------- */
.reference { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 0.5rem 1.25rem; }
.ref-item {
  display: flex; gap: 0.6rem; align-items: baseline;
  font-size: 0.84rem; padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--line-soft);
}
.ref-item code {
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent);
  flex-shrink: 0; min-width: 5.5rem;
}
.ref-item span { color: var(--ink-soft); }

@media (max-width: 480px) {
  .panel { padding: 1.1rem; }
  .registers { grid-template-columns: 1fr 1fr; }
  .memory { grid-template-columns: repeat(2, 1fr); }
  .code-bar { gap: 0.4rem; }
  .code-status { margin-left: 0; flex-basis: 100%; }
}