/* ================================================================
   components.css — Header, footer, theme toggle, tooltip, legend
   ================================================================ */

/* ── Site header ──
   Transparent, floating over content. No background bar.
   Lives on the page grid. Wordmark at c1, nav mid, toggle end. */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: grid;
  grid-template-columns: var(--page-grid-cols);
  column-gap: var(--grid-gutter);
  padding-inline: var(--grid-margin);
  width: 100%;
  height: var(--header-height);
  align-items: center;
  pointer-events: none;
}

.site-header > * {
  pointer-events: auto;
}

.header-wordmark {
  grid-column: c1 / c3;
  font-family: var(--ff-sans);
  font-size: var(--fs-3);
  font-weight: 700;
  letter-spacing: var(--ls-wide);
  text-decoration: none;
  line-height: 1;
  color: var(--c-fg);
}

.header-wordmark:hover {
  text-decoration: none;
}

.header-nav {
  grid-column: c5 / c9;
  display: flex;
  gap: var(--sp-3);
}

.header-nav a {
  font-family: var(--ff-mono);
  font-size: var(--fs-2);
  letter-spacing: var(--ls-meta);
  text-transform: uppercase;
  text-decoration: none;
}

.header-nav a:hover {
  text-decoration: underline;
  text-decoration-color: var(--c-fg);
}

.header-timestamp {
  grid-column: c12 / c15;
  font-family: var(--ff-mono);
  font-size: var(--fs-2);
  letter-spacing: var(--ls-meta);
  color: var(--c-fg);
  text-align: right;
  display: none;
}

@media (min-width: 768px) {
  .header-timestamp {
    display: block;
  }
}


/* ── Theme toggle — pill switch ── */

.theme-toggle {
  grid-column: c16 / c17;
  justify-self: end;
  position: relative;
  width: 2.5rem;
  height: 1.25rem;
  border-radius: 1rem;
  background: var(--c-rule);
  border: 1px solid var(--c-dim);
  transition:
    background var(--dur-med) var(--ease-out),
    border-color var(--dur-med) var(--ease-out);
  cursor: pointer;
  padding: 0;
  overflow: hidden;
  /* Hide text, but keep for accessibility */
  font-size: 0;
  color: transparent;
}

.theme-toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: calc(1.25rem - 6px);
  height: calc(1.25rem - 6px);
  border-radius: 50%;
  background: var(--c-fg);
  transition: transform var(--dur-med) var(--ease-out);
}

[data-theme="light"] .theme-toggle::after {
  transform: translateX(calc(2.5rem - 1.25rem));
}


/* ── Site footer ── */

.site-footer {
  display: grid;
  grid-template-columns: var(--page-grid-cols);
  column-gap: var(--grid-gutter);
  padding-inline: var(--grid-margin);
  width: 100%;
  padding-block: var(--sp-6);
  border-top: 1px solid var(--c-rule);
  margin-top: var(--sp-12);
}

.footer-colophon {
  grid-column: c1 / c5;
  font-family: var(--ff-mono);
  font-size: var(--fs-2);
  letter-spacing: var(--ls-meta);
  color: var(--c-dim);
}

.footer-timestamp {
  grid-column: c13 / c17;
  font-family: var(--ff-mono);
  font-size: var(--fs-2);
  letter-spacing: var(--ls-meta);
  color: var(--c-dim);
  text-align: right;
}


/* ── Graph tooltip ── */

.graph-tooltip {
  position: fixed;
  z-index: var(--z-tooltip);
  padding: var(--sp-2) var(--sp-3);
  background: var(--c-bg);
  border: 1px solid var(--c-rule);
  max-width: 320px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-out);
}

.graph-tooltip.visible {
  opacity: 1;
}

.graph-tooltip.mobile-fixed {
  position: fixed;
  bottom: calc(env(safe-area-inset-bottom, 0px) + var(--sp-4));
  left: var(--grid-margin);
  right: var(--grid-margin);
  top: auto;
  max-width: none;
  width: auto;
}

.tt-tag {
  font-family: var(--ff-mono);
  font-size: var(--fs-1);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
}

.tt-id {
  font-family: var(--ff-mono);
  font-size: var(--fs-2);
  letter-spacing: var(--ls-meta);
  margin-top: var(--sp-1);
}

.tt-title {
  font-family: var(--ff-sans);
  font-size: var(--fs-2);
  font-weight: 700;
  line-height: var(--lh-tight);
  margin-top: var(--sp-1);
}

.tt-abs {
  font-size: var(--fs-2);
  font-family: var(--ff-mono);
  color: var(--c-dim);
  margin-top: var(--sp-1);
  line-height: var(--lh-body);
}

/* On mobile, tooltip anchors to bottom */
@media (hover: none) {
  .graph-tooltip.visible {
    position: fixed;
    bottom: var(--sp-8);
    left: var(--grid-margin);
    right: var(--grid-margin);
    top: auto;
    max-width: none;
    transform: none !important;
  }
}


/* ── Graph legend ── */

.graph-legend {
  display: grid;
  grid-template-columns: var(--page-grid-cols);
  column-gap: var(--grid-gutter);
  padding-inline: var(--grid-margin);
  width: 100%;
  padding-block: var(--sp-2);
}

.legend-label {
  grid-column: c1 / c2;
  font-family: var(--ff-sans);
  font-size: var(--fs-1);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--c-dim);
  align-self: center;
}

.leg-entries {
  grid-column: c2 / c9;
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
}

.leg {
  font-family: var(--ff-sans);
  font-size: var(--fs-2);
  letter-spacing: var(--ls-meta);
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.leg-swatch {
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
}

.node-count {
  grid-column: c13 / c17;
  font-family: var(--ff-mono);
  font-size: var(--fs-2);
  letter-spacing: var(--ls-meta);
  color: var(--c-dim);
  text-align: right;
  align-self: center;
}

.tap-hint {
  display: none;
  text-align: center;
  font-family: var(--ff-sans);
  font-size: var(--fs-1);
  letter-spacing: var(--ls-meta);
  color: var(--c-dim);
  padding-block: var(--sp-1);
}

@media (hover: none) {
  .tap-hint { display: block; }
}