body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  max-width: 960px;
  margin: 2em auto;
  padding: 0 1.5em;
  line-height: 1.7;
  color: #1a1a1a;
  background: #fcfcfc;
}
h1, h2, h3, h4 {
  color: #1a3a5c;
  border-bottom: 1px solid #d0d0d0;
  padding-bottom: 0.25em;
}
h1 { font-size: 2.2em; margin-top: 0; }
h2 { font-size: 1.6em; margin-top: 2em; }
h3 { font-size: 1.25em; margin-top: 1.6em; }
h4 { font-size: 1.1em; margin-top: 1.3em; border-bottom: none; }
code {
  background: #eef1f5;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 0.92em;
}
pre {
  background: #f5f6f8;
  border-left: 4px solid #1a3a5c;
  padding: 1em 1.2em;
  overflow-x: auto;
  font-size: 0.88em;
  line-height: 1.5;
}
table {
  border-collapse: collapse;
  margin: 1.2em 0;
  width: 100%;
}
th, td {
  border: 1px solid #bbb;
  padding: 0.55em 0.85em;
  text-align: left;
  vertical-align: top;
}
th {
  background: #e2e6ec;
  font-weight: 600;
}
a {
  color: #004d99;
}
ul, ol {
  padding-left: 1.6em;
}
li {
  margin-bottom: 0.3em;
}
.note {
  background: #fffbe6;
  border-left: 4px solid #ffc107;
  padding: 0.7em 1em;
  margin: 1em 0;
}
.warn {
  background: #ffeaea;
  border-left: 4px solid #dc3545;
  padding: 0.7em 1em;
  margin: 1em 0;
}
.component-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3em;
  margin: 1.5em 0;
  font-family: monospace;
}
.component-row {
  display: flex;
  gap: 1em;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}
.component-box {
  border: 2px solid #555;
  border-radius: 8px;
  padding: 0.6em 1em;
  text-align: center;
  min-width: 100px;
}
.component-box.energy   { background: #d4edda; border-color: #28a745; }
.component-box.dissip   { background: #f8d7da; border-color: #dc3545; }
.component-box.intercon { background: #d1ecf1; border-color: #17a2b8; }
.component-box.io       { background: #fff3cd; border-color: #ffc107; }
.arrow-down { font-size: 1.4em; }
.nav-links {
  margin-top: 2em;
  padding-top: 1em;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-between;
}