/* Skitse 02: a white surround with rounded inner corners. */
:root {
  --site-frame-width: 12px;
  --site-frame-radius: 24px;
}
html::after {
  content: "";
  position: fixed;
  inset: var(--site-frame-width);
  border-radius: var(--site-frame-radius);
  box-shadow: 0 0 0 100vmax #fff;
  pointer-events: none;
  z-index: 9997;
}
/* Keep the board's edge controls comfortably inside the surround. */
.board-page .icon-menu { top: calc(var(--site-frame-width) + 12px); }
.board-page .theme-toggle {
  top: calc(var(--site-frame-width) + 12px);
  right: calc(var(--site-frame-width) + 12px);
}
.board-page footer > .footer-contact { left: calc(var(--site-frame-width) + 12px); }
@media (max-width: 700px) {
  :root {
    --site-frame-width: 12px;
    --site-frame-radius: 24px;
  }
}
@media print {
  html::after { display: none; }
}

/* One quiet glass surface for the three navigation items. */
:is(.board-page, .case-page) .icon-menu {
  top: calc(var(--site-frame-width) + 12px);
  display: flex;
  gap: 12px;
  padding: 8px 16px;
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 16px;
  background: rgba(255, 255, 255, .08);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08);
}
:is(.board-page, .case-page) .icon-menu a {
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  color: var(--ink);
}
:is(.board-page, .case-page) .icon-menu a:hover,
:is(.board-page, .case-page) .icon-menu a:focus-visible,
:is(.board-page, .case-page) .icon-menu a[aria-current="location"] {
  background: rgba(255, 255, 255, .12);
  box-shadow: none;
  color: var(--ink);
}
:is(.board-page, .case-page) .icon-menu a:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: -2px;
}

/* More legible frosted surfaces, inspired by the milky reference. */
:root {
  --navigation-glass: rgba(255, 255, 255, .28);
  --navigation-glass-border: rgba(255, 255, 255, .88);
  --navigation-glass-hover: rgba(255, 255, 255, .44);
  --navigation-glass-shadow: inset 0 1px 0 #ffffffb3, 0 4px 16px #30243e0d;
}
[data-theme="dark"] {
  --navigation-glass: rgba(236, 229, 250, .10);
  --navigation-glass-border: rgba(236, 229, 250, .32);
  --navigation-glass-hover: rgba(236, 229, 250, .18);
  --navigation-glass-shadow: inset 0 1px 0 #ffffff24, 0 4px 16px #00000014;
}
:is(.board-page, .case-page) .icon-menu,
:is(.board-page, .case-page) .footer-contact a,
:is(.board-page, .case-page) .theme-toggle,
.case-page .case-back,
.case-page .case-end .case-top-button {
  background: var(--navigation-glass);
  border: 1px solid var(--navigation-glass-border);
  box-shadow: var(--navigation-glass-shadow);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  color: var(--ink);
}
:is(.board-page, .case-page) .footer-contact a svg,
:is(.board-page, .case-page) .theme-toggle svg { opacity: .88; }
:is(.board-page, .case-page) .footer-contact a:hover,
:is(.board-page, .case-page) .footer-contact a:focus-visible,
:is(.board-page, .case-page) .theme-toggle:hover,
:is(.board-page, .case-page) .theme-toggle:focus-visible,
.case-page .case-back:hover,
.case-page .case-end .case-top-button:hover {
  background: var(--navigation-glass-hover);
  border-color: var(--navigation-glass-border);
}
:is(.board-page, .case-page) .icon-menu a:hover,
:is(.board-page, .case-page) .icon-menu a:focus-visible,
:is(.board-page, .case-page) .icon-menu a[aria-current="location"] {
  background: #7255ed14;
  box-shadow: inset 0 0 0 1px #7255ed18;
}
[data-theme="dark"] :is(.board-page, .case-page) .icon-menu a:hover,
[data-theme="dark"] :is(.board-page, .case-page) .icon-menu a:focus-visible,
[data-theme="dark"] :is(.board-page, .case-page) .icon-menu a[aria-current="location"] {
  background: #ece5fa24;
  box-shadow: inset 0 0 0 1px #ece5fa24;
}

/* Fully rounded navigation surfaces and their interactive items. */
:is(.board-page, .case-page) .icon-menu,
:is(.board-page, .case-page) .icon-menu a,
:is(.board-page, .case-page) .footer-contact a,
:is(.board-page, .case-page) .theme-toggle,
.case-page .case-back,
.case-page .case-end .case-top-button {
  border-radius: 999px;
}

/* A single vertical glass dock for navigation, theme and contact. */
:is(.board-page, .case-page) .icon-menu {
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 8px;
  max-height: calc(100dvh - 48px);
  overflow-y: auto;
  scrollbar-width: none;
}
:is(.board-page, .case-page) .icon-menu > a,
:is(.board-page, .case-page) .icon-menu > .theme-toggle {
  position: relative;
  inset: auto;
  transform: none;
  flex: 0 0 40px;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  color: var(--ink);
}
:is(.board-page, .case-page) .icon-menu > :is(a, button):hover,
:is(.board-page, .case-page) .icon-menu > :is(a, button):focus-visible {
  background: #a8a3b32e;
}
:is(.board-page, .case-page) .icon-menu > a:first-child {
  background: #ece5fa66;
}
:is(.board-page, .case-page) .icon-menu svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  stroke: none;
}
:is(.board-page, .case-page) .icon-menu .dock-star { width: 24px; height: 24px; }
.dock-divider { width: 24px; height: 1px; background: currentColor; opacity: .12; }
:is(.board-page, .case-page) .icon-menu a span {
  display: none;
}

/* Only the start icon remains visible until the dock is hovered or focused. */
:is(.board-page, .case-page) .icon-menu {
  height: 56px;
  gap: 0;
  overflow: hidden;
  transition: height .24s ease;
}
:is(.board-page, .case-page) .icon-menu > :not(:first-child) {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity .16s ease;
}
:is(.board-page, .case-page) .icon-menu:hover,
:is(.board-page, .case-page) .icon-menu:focus-within {
  height: 312px;
  gap: 8px;
  overflow-y: auto;
}
:is(.board-page, .case-page) .icon-menu:hover > :not(:first-child),
:is(.board-page, .case-page) .icon-menu:focus-within > :not(:first-child) {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}
:is(.board-page, .case-page) .icon-menu > .dock-divider {
  position: static;
  display: block;
  flex-shrink: 0;
  transform: none;
  padding: 0;
  margin: 0;
  border: 0;
  border-radius: 0;
  background: currentColor;
}
:is(.board-page, .case-page) .icon-menu:hover > .dock-divider,
:is(.board-page, .case-page) .icon-menu:focus-within > .dock-divider { opacity: .12; }
@media (hover: none) {
  :is(.board-page, .case-page) .icon-menu {
    height: 312px;
    gap: 8px;
    overflow-y: auto;
  }
  :is(.board-page, .case-page) .icon-menu > :not(:first-child) {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
  }
  :is(.board-page, .case-page) .icon-menu > .dock-divider { opacity: .12; }
}
@media (prefers-reduced-motion: reduce) {
  :is(.board-page, .case-page) .icon-menu,
  :is(.board-page, .case-page) .icon-menu > :not(:first-child) { transition: none; }
}

/* Keep the shared navigation dock above the overlapping page surfaces. */
:is(.board-page, .case-page) > .icon-menu {
  position:fixed;
  left:50%;
  top:calc(var(--site-frame-width) + 12px);
  transform:translateX(-50%);
  z-index:9998;
}
.case-page.project-on-opening > .icon-menu {
  opacity:1;
  visibility:visible;
  pointer-events:auto;
}