/* Shared observing-tool typography, surfaces and controls. */
html[data-theme] {
  --font-head: system-ui, sans-serif;
  --font-body: system-ui, sans-serif;
  --radius: 5px;
  --radius-sm: 4px;
}
html[data-theme] body { background: var(--bg); font: 400 15px/1.45 var(--font-body); }
html[data-theme] :is(h1,h2,h3) { font-weight: 650; letter-spacing: -.025em; line-height: 1.2; }
html[data-theme] :is(.btn,.chip,.hero-cta,.stage-btn,select,input[type=text],input[type=search],input[type=date],input[type=number]) {
  font: 500 .875rem/1.25 var(--font-body);
  letter-spacing: normal;
  text-transform: none;
  border-radius: 4px;
  box-shadow: none;
}
html[data-theme] :is(.btn,.chip) {
  color: var(--text);
  border: 1px solid var(--control-border);
  background: var(--field);
  padding: .43rem .82rem;
  min-height: 32px;
}
html[data-theme] :is(.btn-primary,.mode-switch input:checked + span,.overview-item[aria-pressed=true]) {
  border-color: var(--accent);
}
html[data-theme] :is(.btn-primary,.overview-primary,.mode-switch input:checked + span) { background: var(--accent); color: var(--on-accent); }
html[data-theme] .btn-primary:hover:not(:disabled) { background: var(--accent-hi); color: var(--on-accent); }
html[data-theme] .chip[aria-pressed=true] { color: var(--accent-text); border-color: var(--accent); background: var(--raised); }
html[data-theme] .btn:disabled { opacity: .55; }
html[data-theme] .panel { min-width: 0; border: 1px solid var(--border); border-radius: 5px; padding: 16px; }
html[data-theme] .panel h2 { font-size: 1.16rem; margin: 0 0 .7rem; }
html[data-theme] .panel h3 { font-size: .95rem; }
input[type=range] { accent-color: var(--accent); }
input[type=range]::-webkit-slider-thumb { box-shadow: none; }


/* Viewer tools stay together above the observation and playback controls. */
.viewer-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: color-mix(in srgb, var(--accent) 6%, var(--surface));
  border-top: 1px solid var(--border);
}
.viewer-tools > span { font-weight: 650; margin-inline-end: 6px; }
.viewer-tools .btn { display: inline-flex; align-items: center; gap: 6px; }
.viewer-tools svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: var(--accent-text);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
@media (max-width: 540px) {
  .viewer-tools > span { flex-basis: 100%; }
}

/* One application masthead. The compact menu overlays the page in normal tab order. */
.site-header {
  position: relative; z-index: 6; min-height: 60px; display: flex;
  align-items: center; gap: clamp(16px, 3vw, 48px);
  padding: 0 max(16px, calc((100% - 1440px) / 2 + 20px));
  background: var(--bg); border-bottom: 1px solid var(--border);
}
.site-brand { white-space: nowrap; color: var(--text); font: 700 1.3rem var(--font-head); letter-spacing: -.04em; text-decoration: none; }
.project-menu { flex: 1; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.project-menu nav { display: flex; align-items: center; gap: clamp(4px, 1vw, 18px); }
.project-menu nav a {
  display: flex; align-items: center; min-height: 59px; padding: 0 5px;
  border-bottom: 2px solid transparent; color: var(--text-muted); text-decoration: none;
  font: 500 .91rem/1.25 var(--font-body); white-space: nowrap;
}
.project-menu nav a:hover { color: var(--text); }
.project-menu nav a[aria-current] { color: var(--accent-text); border-color: var(--accent); }
.project-menu select { width: auto; max-width: 12rem; min-height: 36px; }
#pages-toggle,.embed .site-header { display: none; }
@media (max-width: 64rem) {
  .site-header { justify-content: space-between; min-height: 56px; }
  #pages-toggle { display: inline-flex; align-items: center; min-height: 44px; }
  .project-menu { display: none; position: absolute; top: 100%; right: 8px;
    width: min(19rem, calc(100% - 16px)); max-height: calc(100dvh - 64px); overflow: auto;
    padding: 8px; background: var(--surface); border: 1px solid var(--control-border); border-radius: var(--radius); }
  .project-menu.is-open { display: block; }
  .project-menu nav { display: grid; gap: 0; }
  .project-menu nav a { min-height: 44px; padding-inline: 12px; border: 0; }
  .project-menu nav a[aria-current] { background: var(--raised); }
  .project-menu select { margin: 8px; }
}
html[data-theme] :is(.workspace-kicker,.atlas-kicker,.overview-kicker,.info-kicker,.result-links a) {
  text-transform: none; letter-spacing: normal; font-family: var(--font-body);
}