/* ugrad-lab-shell.css — shared μgrad game lab chrome (matches go-ugrad / chess-ugrad gu-* layout) */
:root {
  font-family: ui-sans-serif, system-ui, sans-serif;
}
html,
body {
  height: 100%;
  margin: 0;
}
body.ugb-surface {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  background: var(--ugb-page, var(--qp-bg-elevated, #0f1419));
  color: var(--qp-fg-primary, #e8edf4);
}
.gu-header {
  border-bottom: 1px solid var(--qp-border, #30363d);
  background: rgba(0, 0, 0, 0.28);
  flex-shrink: 0;
  position: relative;
  z-index: 5;
}
.gu-header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 14px;
  min-height: 42px;
  box-sizing: border-box;
}
.gu-header-brand strong {
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--qp-fg-primary, #e8edf4);
}
.gu-header-spacer {
  flex: 1;
  min-width: 12px;
}
.gu-theme-host {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  line-height: 1;
}
.gu-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 8px 12px;
  border-top: 1px solid rgba(48, 54, 61, 0.45);
  background: rgba(0, 0, 0, 0.18);
}
.gu-bar button {
  font: 600 10px ui-monospace, monospace;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--qp-border, #30363d);
  background: transparent;
  cursor: pointer;
  color: var(--qp-fg-primary, #e8edf4);
}
.gu-bar button.gu-primary {
  background: var(--qp-fg-primary, #e8edf4);
  color: var(--qp-bg-base, #161b22);
}
.gu-main {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 14px;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.gu-board-wrap {
  flex: 1;
  min-width: 280px;
  border: 1px solid var(--qp-border, #30363d);
  border-radius: 14px;
  padding: 12px;
  background: var(--ugb-panel, rgba(0, 0, 0, 0.2));
}
.gu-board-wrap h2 {
  font-size: 12px;
  margin: 0 0 8px;
  font-weight: 700;
  color: var(--qp-fg-body, #e8edf4);
}
.gu-side {
  flex: 1;
  min-width: 260px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.gu-log {
  font: 10px ui-monospace, monospace;
  white-space: pre-wrap;
  max-height: 280px;
  overflow: auto;
  padding: 10px;
  border: 1px solid var(--qp-border, #30363d);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.25);
  color: var(--qp-fg-body, #c9d1d9);
}
.gu-lab-section {
  font: 500 11px ui-sans-serif, system-ui, sans-serif;
  color: var(--qp-fg-muted, #8b949e);
  line-height: 1.55;
  margin: 0 0 12px;
}
.gu-lab-section:last-child {
  margin-bottom: 0;
}
.gu-lab-section h3 {
  font: 700 10px ui-monospace, monospace;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #58a6ff;
  margin: 0 0 6px;
}
.gu-lab-section p {
  margin: 0 0 8px;
}
.gu-lab-section a {
  color: inherit;
  border-bottom: 1px solid var(--qp-border, #30363d);
  text-decoration: none;
}
.gu-lab-section a:hover {
  border-bottom-color: var(--qp-fg-muted, #8b949e);
}
.gu-foot {
  font: 500 10px ui-monospace, monospace;
  text-align: center;
  padding: 12px;
  color: var(--qp-fg-subtle, #8b949e);
  border-top: 1px solid var(--qp-border, #30363d);
  flex-shrink: 0;
}
.gu-foot a {
  color: inherit;
}
[data-theme='light'] {
  --qp-bg-elevated: #f6f8fa;
}