/* <sg-site-nav>. Works with no JavaScript. The links live in a native
   <details>: on a narrow screen its summary is the menu button; from 40rem
   the summary hides and ::details-content shows the links as a row. */

sg-site-nav {
  display: block;
  container-type: inline-size;
  color: var(--sg-text);
  font: var(--sg-step-0) / var(--sg-leading-snug) var(--sg-font-body);
}
sg-site-nav[hidden] { display: none; }

sg-site-nav nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sg-space-2) var(--sg-space-4);
  padding-block: var(--sg-space-3);
  border-bottom: var(--sg-hairline) solid var(--sg-rule-strong);
}
sg-site-nav .sg-site-nav-home {
  font: 400 var(--sg-step-2) / 1.1 var(--sg-font-display);
  color: var(--sg-text);
  text-decoration: none;
  padding-block: var(--sg-space-1);
}
sg-site-nav a:focus-visible,
sg-site-nav summary:focus-visible { outline: var(--sg-focus-width) solid var(--sg-focus); outline-offset: var(--sg-focus-offset); border-radius: var(--sg-radius-1); }

sg-site-nav details { flex: 0 1 auto; }
sg-site-nav summary {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  min-height: 2.75rem;
  padding: 0 var(--sg-space-3);
  border: var(--sg-hairline) solid var(--sg-rule-strong);
  border-radius: var(--sg-radius-2);
  cursor: pointer;
  list-style: none;
  font-weight: var(--sg-weight-medium);
}
sg-site-nav summary::-webkit-details-marker { display: none; }
sg-site-nav summary::before {
  content: "";
  width: 1em;
  height: 0.8em;
  background: linear-gradient(currentColor, currentColor) 0 0 / 100% 2px no-repeat, linear-gradient(currentColor, currentColor) 0 50% / 100% 2px no-repeat, linear-gradient(currentColor, currentColor) 0 100% / 100% 2px no-repeat;
}
sg-site-nav details[open] > summary::before {
  background: linear-gradient(currentColor, currentColor) 0 50% / 100% 2px no-repeat;
}

sg-site-nav ul {
  list-style: none;
  margin: 0;
  padding: var(--sg-space-2) 0 0;
  display: grid;
  gap: 0;
}
sg-site-nav ul a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding-inline: var(--sg-space-2);
  color: var(--sg-text);
  text-decoration: none;
}
sg-site-nav ul a:hover { text-decoration: underline; text-decoration-thickness: var(--sg-hairline); text-underline-offset: 0.25em; }
sg-site-nav ul a[aria-current] { font-weight: var(--sg-weight-medium); text-decoration: underline; text-decoration-thickness: var(--sg-stroke-bold); text-underline-offset: 0.3em; }

/* Narrow and open: the list drops below the brand, full width. */
@container (max-width: 39.99rem) {
  sg-site-nav details[open] { flex-basis: 100%; order: 1; }
  sg-site-nav details[open] > summary { margin-inline-start: auto; display: flex; width: fit-content; }
}

/* Wide: the row, no summary. The summary hides only where ::details-content
   can show the links; elsewhere the element opens the disclosure and sets
   data-wide, and without either the summary stays, one press from the links. */
@container (min-width: 40rem) {
  @supports selector(::details-content) {
    sg-site-nav summary { display: none; }
    sg-site-nav details::details-content { content-visibility: visible; display: block; }
  }
  sg-site-nav ul { display: flex; flex-wrap: wrap; gap: var(--sg-space-1) var(--sg-space-3); padding: 0; }
}
sg-site-nav[data-wide] summary { display: none; }

/* ── warm: written on the paper, a pencil line under the current page ── */
sg-site-nav[data-skin="warm"] nav { border-bottom-color: transparent; background: linear-gradient(var(--sg-pencil), var(--sg-pencil)) 0 100% / 100% 1px no-repeat; }
sg-site-nav[data-skin="warm"] ul a { font: var(--sg-step-1) / 1.2 var(--sg-font-hand); }
sg-site-nav[data-skin="warm"] ul a[aria-current] { text-decoration: none; font-weight: 400; }
sg-site-nav[data-skin="warm"] summary { font-family: var(--sg-font-hand); font-weight: 400; font-size: var(--sg-step-1); border-color: var(--sg-pencil); border-radius: 46% 54% 50% 50% / 20% 20% 24% 22%; }
sg-site-nav .sg-site-nav-pencil {
  position: absolute;
  left: var(--sg-space-2);
  right: var(--sg-space-2);
  bottom: 0.35rem;
  width: calc(100% - 2 * var(--sg-space-2));
  height: 8px;
  overflow: visible;
  pointer-events: none;
  fill: none;
  stroke: var(--sg-accent-text);
  stroke-linecap: round;
}
sg-site-nav .sg-site-nav-pencil path:first-child { stroke-width: 1.8; }
sg-site-nav .sg-site-nav-pencil path:last-child { stroke-width: 0.9; opacity: 0.55; }

/* ── playful: stamped tabs ── */
sg-site-nav[data-skin="playful"] nav { border-bottom: var(--sg-stroke-bold) solid var(--sg-text); padding-bottom: 0; align-items: end; }
sg-site-nav[data-skin="playful"] .sg-site-nav-home { font-family: var(--sg-font-hand); padding-bottom: var(--sg-space-2); }
sg-site-nav[data-skin="playful"] ul { gap: var(--sg-space-2); padding-bottom: var(--sg-space-2); }
sg-site-nav[data-skin="playful"] ul a {
  padding-inline: var(--sg-space-3);
  border: var(--sg-stroke-bold) solid var(--sg-text);
  border-radius: var(--sg-radius-2);
  box-shadow: inset 0 0 0 2px var(--sg-surface), inset 0 0 0 3px var(--sg-text);
  background: var(--sg-surface-raised);
  font: var(--sg-weight-bold) var(--sg-step--1) / 1 var(--sg-font-body);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transform: rotate(var(--sg-nav-tilt, 0deg));
}
sg-site-nav[data-skin="playful"] ul a[aria-current] {
  background: var(--sg-accent);
  color: var(--sg-on-accent);
  border-color: var(--sg-accent);
  box-shadow: inset 0 0 0 2px var(--sg-accent), inset 0 0 0 3px var(--sg-on-accent);
  text-decoration: none;
}
sg-site-nav[data-skin="playful"] summary { border-width: var(--sg-stroke-bold); border-color: var(--sg-text); font-weight: var(--sg-weight-bold); margin-bottom: var(--sg-space-2); }
@container (min-width: 40rem) {
  sg-site-nav[data-skin="playful"] ul { padding-bottom: 0; }
  sg-site-nav[data-skin="playful"] ul a { border-bottom-left-radius: 0; border-bottom-right-radius: 0; border-bottom-width: 0; margin-bottom: -1px; transform-origin: 50% 100%; }
}

@media (forced-colors: active) {
  sg-site-nav .sg-site-nav-pencil { stroke: LinkText; }
  sg-site-nav ul a[aria-current] { border: 2px solid LinkText; }
}