.protocol-page {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.protocol-intro {
  text-align: left;
  max-width: var(--column-prose);
  margin-inline: auto;
}

.protocol-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 40px -20px color-mix(in oklch, var(--fg), transparent 90%);
}

.protocol-card-header {
  padding: var(--space-4) var(--space-6);
  background: var(--fg-wash);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.protocol-card-body {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 500px;
}

.protocol-card-body:has(.protocol-controls:empty) {
  grid-template-columns: 1fr;
}

.protocol-controls {
  padding: var(--space-6);
  border-right: 1px solid var(--border);
  background: var(--fg-wash);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.protocol-visualization {
  flex: 1;
  background: var(--bg);
  position: relative;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.protocol-log {
  height: 120px;
  background: oklch(2% 0 0);
  color: oklch(90% 0 0);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: var(--space-4);
  overflow-y: auto;
  border-top: 1px solid var(--border);
}

.protocol-details {
  max-width: var(--column-prose);
  margin-inline: auto;
  line-height: var(--leading-prose);
}

.protocol-suggestions {
  margin-top: var(--space-16);
  padding-top: var(--space-12);
  border-top: 1px solid var(--border-subtle);
}

.protocol-suggestions h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-align: center;
  margin-bottom: var(--space-8);
}

@media (max-width: 900px) {
  .protocol-card-body { grid-template-columns: 1fr; }
  .protocol-controls { border-right: none; border-bottom: 1px solid var(--border); }
}

.demo-runner-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
}

.demo-runner-title {
  margin: 0 auto 0 0;
  font-size: var(--type-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.stat-inline {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--type-sm);
  color: var(--muted);
}

.stat-item { white-space: nowrap; }
.stat-item span { color: var(--fg); font-weight: 500; }

#demo-status-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
}

.demo-runner-body {
  display: flex;
  gap: var(--space-6);
  margin-block: var(--space-6);
  min-height: 0;
}

.demo-runner-controls {
  flex: 0 0 200px;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.demo-runner-controls:empty { display: none; }

.demo-runner-main { flex: 1 1 auto; min-width: 0; display: flex; }

.protocol-viz-zone {
  position: relative;
  flex: 1 1 auto;
  width: 100%;
  min-height: 440px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 20px 40px -20px color-mix(in oklch, var(--fg), transparent 90%);
  overflow: hidden;
}

.demo-idle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-8);
  text-align: center;
}

.demo-idle-illust { width: 76px; height: 76px; color: var(--fg); }
.demo-idle-illust svg { width: 100%; height: 100%; display: block; }

.demo-idle-hint {
  max-width: 34ch;
  font-size: var(--type-xs);
  color: var(--muted);
}

.demo-idle-hint.is-error { color: var(--fg); }

.control-group { display: flex; flex-direction: column; gap: var(--space-2); }

.control-label {
  font-family: var(--font-mono);
  font-size: var(--type-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.demo-runner-log {
  flex: 0 0 auto;
  max-height: 8.5em;
  overflow-y: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: var(--type-xs);
  color: var(--muted);
}

.log-entry { line-height: 1.7; }

@media (max-width: 760px) {
  .demo-runner-body { flex-direction: column; }
  .demo-runner-controls { flex-basis: auto; }
}