:root {
  --r-main-font-size: 32px;
  --r-heading-text-transform: none;
  --accent: #4285f4;
  --ok: #188038;
  --ok-bg: #e6f4ea;
  --ko: #c5221f;
  --ko-bg: #fce8e6;
  --muted: #5f6368;
}

.reveal h1, .reveal h2, .reveal h3 {
  color: #202124;
}

.reveal .muted {
  color: var(--muted);
}

.reveal .small {
  font-size: 0.75em;
}

.reveal .biblio li {
  font-size: 0.7em;
}

.reveal blockquote {
  width: 85%;
  font-size: 0.9em;
  box-shadow: none;
  border-left: 6px solid var(--accent);
  background: #f8f9fa;
  padding: 0.6em 1em;
  text-align: left;
}

.reveal table {
  font-size: 0.75em;
  margin-top: 0.8em;
}

.reveal ul + h3, .reveal ol + h3, .reveal table + p {
  margin-top: 0.8em;
}

.reveal table th {
  background: #f1f3f4;
}

.reveal img.diagram {
  border: none;
  box-shadow: none;
  max-height: 480px;
  margin: 0.4em auto;
}

.reveal .columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2em;
  text-align: left;
}

.reveal .columns > div {
  padding: 0.6em 0.8em;
  border-radius: 8px;
  background: #f8f9fa;
}

.reveal table.compact {
  font-size: 0.65em;
}

.reveal .timeline td:first-child {
  white-space: nowrap;
  color: var(--accent);
  font-weight: bold;
}

/* Démo : effet avalanche */
.demo-hash {
  font-size: 0.7em;
  text-align: left;
}

.demo-hash input {
  font-size: 1.1em;
  width: 100%;
  padding: 0.2em 0.4em;
  margin-top: 0.6em;
}

.demo-hash .hash {
  display: block;
  font-family: monospace;
  word-break: break-all;
  margin: 0.3em 0;
}

.demo-hash .changed {
  color: var(--ko);
  font-weight: bold;
}

.demo-hash .diff {
  text-align: center;
  color: var(--muted);
}

/* Démo : chaîne de blocs */
.demo-chain {
  font-size: 0.5em;
}

.demo-chain .chain-controls {
  margin-bottom: 0.6em;
}

.demo-chain .chain-blocks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1em;
  text-align: left;
}

.demo-chain .block {
  border: 3px solid;
  border-radius: 8px;
  padding: 0.6em;
  display: flex;
  flex-direction: column;
  gap: 0.15em;
}

.demo-chain .block.valid {
  border-color: var(--ok);
  background: var(--ok-bg);
}

.demo-chain .block.invalid {
  border-color: var(--ko);
  background: var(--ko-bg);
}

.demo-chain .title {
  font-weight: bold;
  font-size: 1.3em;
}

.demo-chain label {
  color: var(--muted);
  margin-top: 0.3em;
}

.demo-chain code {
  font-family: monospace;
  word-break: break-all;
}

.demo-chain textarea, .demo-chain input, .demo-chain select, .demo-chain button {
  font: inherit;
}

.demo-chain button {
  margin-top: 0.5em;
  cursor: pointer;
}

.demo-chain .status {
  color: var(--muted);
}