.bd-preset-grid {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 0.85rem;
}
@media (min-width: 720px) {
  .bd-preset-grid {
    grid-template-columns: 1fr 1fr;
  }
}
.bd-preset-grid button {
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  padding: 0.55rem 0.7rem;
  cursor: pointer;
  color: var(--ink);
  font: inherit;
}
.bd-preset-grid button.is-active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 22%, transparent);
}
.bd-preset-grid .title {
  display: block;
  font-weight: 650;
  font-size: 0.92rem;
}
.bd-preset-grid .meta {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.rule-box {
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface);
  margin-bottom: 0.75rem;
  color: var(--muted);
}

.verdict {
  display: inline-flex;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.4rem 0.65rem;
  border-radius: 8px;
  margin-bottom: 0.75rem;
}
.verdict.ok {
  background: var(--ok-bg);
  color: var(--ok);
}
.verdict.bad {
  background: var(--err-bg);
  color: var(--err);
}
.verdict.warn {
  background: var(--warn-bg);
  color: var(--warn);
}

.canvas-wrap {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 12px;
  background:
    linear-gradient(145deg, color-mix(in srgb, var(--accent) 5%, var(--surface2)), var(--surface2));
  min-height: 420px;
  overflow: auto;
}

.wire-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.wire-svg path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.25;
  stroke-linecap: round;
}
.wire-svg path.bad {
  stroke: var(--err);
  stroke-dasharray: 5 4;
}
.wire-svg path.sel {
  stroke: var(--signal);
  stroke-width: 3;
}

.blocks {
  position: relative;
  min-height: 420px;
  min-width: 640px;
}

.block {
  position: absolute;
  width: 150px;
  border: 2px solid color-mix(in srgb, var(--accent) 40%, var(--line));
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 0.45rem 0.35rem 0.55rem;
}
.block.kind-cpu { border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); }
.block.kind-alu { border-color: color-mix(in srgb, var(--signal) 55%, var(--line)); }
.block.kind-reg { border-color: color-mix(in srgb, #3a6ea5 55%, var(--line)); }
.block.kind-mem { border-color: color-mix(in srgb, var(--err) 40%, var(--line)); }
.block.kind-bus { border-color: color-mix(in srgb, var(--warn) 50%, var(--line)); }

.block-title {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.85rem;
  text-align: center;
  margin: 0 0 0.35rem;
  color: var(--ink);
}
.block-role {
  display: block;
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: center;
  margin-bottom: 0.35rem;
}

.ports {
  display: grid;
  gap: 0.25rem;
}
.port {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface2);
  padding: 0.22rem 0.35rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  cursor: pointer;
  color: var(--ink);
}
.port:hover {
  border-color: var(--accent);
}
.port.out { border-left: 3px solid var(--accent); }
.port.in { border-right: 3px solid var(--signal); }
.port.active {
  outline: 2px solid var(--accent);
  background: var(--accent-soft);
  font-weight: 700;
}
.port.wired {
  background: color-mix(in srgb, var(--ok) 12%, var(--surface2));
}
.port .tag {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--muted);
}
.port.type-addr .tag { color: var(--accent); }
.port.type-data .tag { color: var(--signal); }
.port.type-ctrl .tag { color: #3a6ea5; }
.port.type-instr .tag { color: var(--err); }

.conn-list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  font-family: var(--mono);
  font-size: 0.8rem;
  display: grid;
  gap: 0.3rem;
}
.conn-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}
.conn-list li.bad {
  border-color: color-mix(in srgb, var(--err) 50%, var(--line));
  background: var(--err-bg);
}
.conn-list button {
  font-family: var(--mono);
  font-size: 0.72rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface2);
  cursor: pointer;
  padding: 0.15rem 0.4rem;
  color: var(--ink);
}

.bd-msg {
  font-family: var(--mono);
  font-size: 0.85rem;
  margin: 0.45rem 0 0;
}
.bd-msg.ok { color: var(--ok); }
.bd-msg.err { color: var(--err); }
.bd-hint {
  margin: 0.45rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.bd-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}