/* The Lab's header: the app's LabHeader (linked from index.html) and <lab-header> (public/lab-header.js, in its
   shadow root) for pages the app doesn't render. One stylesheet, so they can't drift. Every token has the Lab's
   value as a fallback for hosts without them. */

/* merttoka.com's floating bar (its css/style.css, "Navbar"), kept in the page's flow: sticky, a gap above it, 90% wide
   up to 1000px, glass. Its footprint is --header-height (gap + bar), which the layouts below it read. */
.lab-header-bar {
  position: sticky;
  top: var(--header-gap, 12px);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 90%;
  max-width: 1000px;
  height: calc(var(--header-height, 68px) - var(--header-gap, 12px));
  margin: var(--header-gap, 12px) auto 0;
  padding: 0 24px;
  gap: 1rem;
  background: color-mix(in srgb, var(--bg-card, #1a1a1a) 85%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid color-mix(in srgb, var(--border, #222) 50%, transparent);
  border-radius: 16px;
  box-shadow: var(--header-shadow, 0 4px 30px rgba(0, 0, 0, 0.1));
  /* Its own type, as a host page's may differ (the Lab's body: Manrope 16/1.6) */
  color: var(--text-primary, #e0e0e0);
  font: 400 16px/1.6 var(--font-body, 'Manrope', system-ui, sans-serif);
}

/* <lab-header>: the element is the sticky box (a sticky bar can't leave its parent, and the host is only as tall as
   the bar); the bar inside fills it. */
:host {
  display: block;
  position: sticky;
  top: var(--header-gap, 12px);
  z-index: 50;
  width: 90%;
  max-width: 1000px;
  margin: var(--header-gap, 12px) auto 0;
}
:host .lab-header-bar { position: static; width: 100%; max-width: none; margin: 0; }

/* The app's reset, which a shadow root doesn't inherit. */
.lab-header-bar, .lab-header-bar * { box-sizing: border-box; }

.lab-header-left {
  display: flex;
  align-items: center;
  /* The bar's full height, so the flask's bubbles have room to rise before the overflow clips them. */
  align-self: stretch;
  /* merttoka.com's spacing: 12px between the logo and the name. */
  gap: 12px;
  /* Never narrower than what it shows: the crumbs (no width of their own) give way first; out of room, the bar drops
     the logo, then the flask (below), and only then do a page's tools scroll. */
  min-width: min-content;
  flex: 1;
  overflow: hidden;
}

.lab-header-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 0;
}
/* A page's own switches: a strip that scrolls sideways where the bar is too narrow for them, the theme button kept. */
.lab-header-tools {
  display: flex;
  align-items: center;
  gap: inherit;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.lab-header-tools > * { flex-shrink: 0; }
.lab-header-tools[hidden] { display: none; }
.lab-header-tools::-webkit-scrollbar { display: none; }
.lab-header-right > .theme-toggle { flex-shrink: 0; }
/* <lab-header>'s slotted tools (the page's elements; a selector the page's own sheet ignores) */
.lab-header-tools ::slotted(*) { flex-shrink: 0; }

.lab-header-bar .lab-header-brand,
.lab-header-bar .lab-header-brand:hover {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary, #e0e0e0);
  text-decoration: none;
  flex-shrink: 0;
}

.lab-header-site { display: block; flex-shrink: 0; border-radius: 6px; }
/* Out of room (the tools would scroll, or the page's name is squeezed): the logo goes first, then the flask, and on a
   phone, where "Lab" is hidden, the Lab link with it. The app's headerFit.ts and lab-header.js set the classes. */
.lab-header-bar.is-tight-1 .lab-header-site { display: none; }
.lab-header-bar.is-tight-2 .lab-flask { display: none; }
@media (max-width: 480px) {
  .lab-header-bar.is-tight-2 .lab-header-brand { display: none; }
}
.lab-header-logo {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  object-fit: cover;
  display: block;
}
/* merttoka.com's logo hover: a springy tilt. */
@media (prefers-reduced-motion: no-preference) {
  .lab-header-logo { transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.3s ease; }
  .lab-header-site:hover .lab-header-logo,
  .lab-header-site:focus-visible .lab-header-logo { transform: scale(1.1) rotate(5deg); filter: brightness(1.1); }
}
@media (prefers-reduced-motion: reduce) {
  .lab-header-site:hover .lab-header-logo { opacity: 0.8; }
}

/* The flask, as on merttoka.com: bubbles rise from its neck now and then, it boils on hover, and a click boils it
   over (LabHeader's boilOver). */
/* After the name as on merttoka.com: 12px on (the brand's gap), an 8px pad round a 15px glyph, in the secondary text
   colour, nudged 1.5px down to sit on the name's baseline. */
.lab-flask {
  position: relative;
  display: inline-flex;
  padding: 8px;
  margin-top: 1.5px;
  color: var(--text-secondary, #999);
  transition: color var(--transition, 0.2s ease);
}
.lab-flask svg { display: block; }
.lab-header-brand:hover .lab-flask, .lab-header-brand:focus-visible .lab-flask { color: var(--link, #e5578b); }
/* The flask's neck: the pad's top. */
.lab-bubbles { position: absolute; left: 50%; top: 8px; pointer-events: none; }
.lab-bubbles span {
  position: absolute;
  left: -1.5px;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--accent, #bf1656);
  opacity: 0;
}
.lab-bubbles span:nth-child(2) { left: 0.5px; width: 2px; height: 2px; }
.lab-bubbles span:nth-child(3) { left: -3px; }
.lab-burst-bubble {
  position: fixed;
  z-index: 100;
  border-radius: 50%;
  border: 1.5px solid var(--accent, #bf1656);
  pointer-events: none;
}
.lab-burst-bubble.is-filled { background: var(--accent, #bf1656); border: 0; opacity: 0.6; }

@media (prefers-reduced-motion: no-preference) {
  /* Idle: each bubble rises in the first ~1 s of a 7 s cycle, staggered. */
  .lab-bubbles span { animation: lab-bubble 7s ease-out infinite; }
  .lab-bubbles span:nth-child(2) { animation-delay: 0.45s; }
  .lab-bubbles span:nth-child(3) { animation-delay: 0.9s; }
  .lab-header-brand:hover .lab-bubbles span,
  .lab-header-brand:focus-visible .lab-bubbles span { animation: lab-boil 0.9s ease-out infinite; }
  .lab-header-brand:hover .lab-bubbles span:nth-child(2),
  .lab-header-brand:focus-visible .lab-bubbles span:nth-child(2) { animation-delay: 0.3s; }
  .lab-header-brand:hover .lab-bubbles span:nth-child(3),
  .lab-header-brand:focus-visible .lab-bubbles span:nth-child(3) { animation-delay: 0.6s; }
  .lab-header-brand.is-boiling .lab-flask svg { animation: lab-wobble 0.35s ease-in-out; }
}

@keyframes lab-bubble {
  0% { transform: translate(0, 0) scale(0.6); opacity: 0; }
  3% { opacity: 0.9; }
  14% { transform: translate(1px, -10px) scale(1); opacity: 0; }
  100% { transform: translate(1px, -10px) scale(1); opacity: 0; }
}
@keyframes lab-boil {
  0% { transform: translate(0, 0) scale(0.6); opacity: 0; }
  15% { opacity: 1; }
  100% { transform: translate(1px, -12px) scale(1.2); opacity: 0; }
}
@keyframes lab-wobble {
  0%, 100% { transform: rotate(0); }
  25% { transform: rotate(-12deg); }
  75% { transform: rotate(10deg); }
}

/* merttoka.com's name style */
.lab-header-wordmark {
  font-family: var(--font-body, 'Manrope', system-ui, sans-serif);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.lab-header-crumbs {
  display: flex;
  flex: 1 1 0;
  width: 0;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 0.82rem;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.lab-header-crumbs[hidden] { display: none; }

.lab-header-crumb {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  /* Only the current page's name gives way, ending in an ellipsis; the links before it keep their width. */
  flex-shrink: 0;
  min-width: 0;
}
.lab-header-crumb:last-child { flex-shrink: 1; }

.lab-header-crumb a {
  color: var(--text-muted, #666);
  text-decoration: none;
  transition: color var(--transition, 0.2s ease);
}

.lab-header-crumb a:hover {
  color: var(--accent, #bf1656);
}

.lab-header-crumb .is-current {
  color: var(--text-primary, #e0e0e0);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lab-header-sep {
  color: var(--text-muted, #666);
  opacity: 0.5;
  user-select: none;
}

/* merttoka.com's theme switch: one button, the icon of the theme showing. */
.theme-toggle {
  display: flex;
  align-items: center;
  padding: 8px;
  margin: 0;
  background: none;
  border: none;
  line-height: 1;
  color: var(--text-primary, #e0e0e0);
  cursor: pointer;
  transition: color var(--transition, 0.2s ease);
}
.theme-toggle svg { display: block; }
.theme-toggle:hover { color: var(--link, #e5578b); }
.theme-toggle:focus-visible {
  outline: 2px solid var(--accent, #bf1656);
  outline-offset: 2px;
  border-radius: 4px;
}

/* A phone: the bar nearly edge to edge (merttoka.com's 86% leaves the crumbs too little), tighter padding. */
@media (max-width: 768px) {
  .lab-header-bar, :host { width: calc(100% - 2 * var(--header-gap, 10px)); }
  .lab-header-bar { padding: 0 14px; }
  :host .lab-header-bar { width: 100%; }
  .lab-header-right { gap: 0.3rem; }
}

/* Below 620 px the full trail squeezes the page's name to nothing: the page's name alone. The Lab link still goes back
   to the page's row on the home. */
@media (max-width: 620px) {
  .lab-header-crumb:not(:last-child) { display: none; }
}

@media (max-width: 480px) {
  .lab-header-wordmark {
    display: none;
  }
}