/* Back to Engineering — dark emerald theme, matching /tree/ */

:root {
  --b2e-bg: #0a0f0c;
  --b2e-panel: #101813;
  --b2e-border: rgba(255, 255, 255, 0.08);
  --b2e-text: #e7efe9;
  --b2e-dim: #8ba394;
  --b2e-accent: #5fbf82;
}

[data-md-color-scheme="slate"] {
  --md-default-bg-color: var(--b2e-bg);
  --md-default-fg-color: var(--b2e-text);
  --md-default-fg-color--light: #c3d2c8;
  --md-default-fg-color--lighter: var(--b2e-dim);
  --md-default-fg-color--lightest: rgba(255, 255, 255, 0.06);
  --md-primary-fg-color: var(--b2e-bg);
  --md-primary-bg-color: var(--b2e-text);
  --md-accent-fg-color: var(--b2e-accent);
  --md-accent-fg-color--transparent: rgba(95, 191, 130, 0.12);
  --md-typeset-a-color: var(--b2e-accent);
  --md-code-bg-color: #0f1712;
  --md-code-fg-color: #d7e6dc;
  --md-footer-bg-color: #070b09;
  --md-footer-bg-color--dark: #070b09;
  --md-admonition-bg-color: var(--b2e-panel);
}

/* Subtle engineering grid, same as the tree page */
body {
  background-image:
    linear-gradient(rgba(110, 231, 168, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 231, 168, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  background-attachment: fixed;
}

.md-header {
  background-color: rgba(10, 15, 12, 0.9);
  border-bottom: 1px solid var(--b2e-border);
  backdrop-filter: blur(6px);
}
.md-tabs { background: transparent; }
.md-header .b2e-header-social {
  display: flex;
  gap: 0.1rem;
  margin-left: 0.35rem;
}
.md-header .b2e-header-social .md-social__link {
  width: 1.8rem;
  height: 1.8rem;
  color: var(--md-primary-bg-color);
  opacity: 0.78;
}
.md-header .b2e-header-social .md-social__link:hover {
  color: var(--b2e-accent);
  opacity: 1;
}
.md-footer .md-social:empty {
  display: none;
}

.md-typeset h1,
.md-typeset h2,
.md-typeset h3 { font-weight: 600; color: var(--b2e-text); }

.md-nav__link:hover,
.md-nav__link--active { color: var(--b2e-accent); }

.md-typeset code {
  border: 1px solid var(--b2e-border);
  border-radius: 6px;
}

.md-typeset table:not([class]) {
  border: 1px solid var(--b2e-border);
  border-radius: 10px;
  background: var(--b2e-panel);
}

/* Contributor callouts injected by scripts/hooks.py */
.contributor-callout {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.65rem;
  margin: 2rem 0 1rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid rgba(95, 191, 130, 0.34);
  border-left: 4px solid var(--b2e-accent);
  border-radius: 8px;
  background: linear-gradient(90deg, rgba(95, 191, 130, 0.14), rgba(95, 191, 130, 0.04));
}
.contributor-label {
  color: var(--b2e-dim);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}
.contributor-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}
.md-typeset .contributor-link,
.md-typeset .contributor-pr {
  display: inline-flex;
  align-items: center;
  min-height: 1.4rem;
  text-decoration: none;
}
.md-typeset .contributor-link {
  color: var(--b2e-text);
  font-size: 0.78rem;
  font-weight: 700;
}
.md-typeset .contributor-link:hover {
  color: var(--b2e-accent);
}
.md-typeset .contributor-pr {
  margin-left: 0.35rem;
  padding: 0.1rem 0.45rem;
  border: 1px solid rgba(95, 191, 130, 0.34);
  border-radius: 999px;
  color: var(--b2e-dim);
  font-size: 0.62rem;
  font-weight: 700;
}
.md-typeset .contributor-pr:hover {
  border-color: var(--b2e-accent);
  color: var(--b2e-accent);
}

/* Responsive YouTube embeds injected by scripts/hooks.py */
.video-embed {
  position: relative;
  aspect-ratio: 16 / 9;
  width: 100%;
  margin: 1rem 0 1.5rem;
  border: 1px solid var(--b2e-border);
  border-radius: 12px;
  overflow: hidden;
  background: #000;
}
.video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Image galleries injected by scripts/hooks.py */
.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  gap: 1rem;
  margin: 1rem 0 1.5rem;
}
.md-typeset .image-figure {
  margin: 0;
  border: 1px solid var(--b2e-border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--b2e-panel);
}
.md-typeset .image-figure img {
  display: block;
  width: 100%;
  height: auto;
}
.md-typeset .image-figure figcaption {
  padding: 0.65rem 0.8rem;
  border-top: 1px solid var(--b2e-border);
  color: var(--b2e-dim);
  font-size: 0.68rem;
  line-height: 1.4;
}

/* Tree navigation injected by scripts/hooks.py */
.tree-node-action { margin-top: 1.5rem; }
.md-typeset .tree-node-link {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: 1px solid rgba(95, 191, 130, 0.45);
  border-radius: 99px;
  background: rgba(95, 191, 130, 0.1);
  color: var(--b2e-text);
  font-size: 0.72rem;
  font-weight: 700;
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}
.md-typeset .tree-node-link:hover {
  border-color: var(--b2e-accent);
  color: var(--b2e-accent);
}

/* "Next in the tree" buttons injected by scripts/hooks.py */
.next-nodes { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.md-typeset .next-node {
  display: inline-block;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--b2e-border);
  border-radius: 99px;
  background: var(--b2e-panel);
  color: var(--b2e-text);
  font-size: 0.72rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}
.md-typeset .next-node:hover { border-color: var(--b2e-accent); color: var(--b2e-accent); }
.md-typeset .next-node.project {
  border-color: rgba(95, 191, 130, 0.45);
  background: rgba(95, 191, 130, 0.1);
}