/* Shared layout shell — tokens align with DESIGN.md surface + action colors */

:root {
  --layout-surface-body: #111827;
  --layout-surface-nav: #1f2937;
  --layout-border: #374151;
  --layout-scrollbar-track: #1f2937;
  --layout-scrollbar-thumb: #4b5563;
  --layout-scrollbar-thumb-hover: #6b7280;
  --layout-focus-ring: #3b82f6;
  --layout-transition: 150ms cubic-bezier(0.25, 1, 0.5, 1);
}

.layout-body {
  padding-left: env(safe-area-inset-left, 0);
  padding-right: env(safe-area-inset-right, 0);
  font-family: Inter, system-ui, sans-serif;
}

.layout-nav {
  padding-top: env(safe-area-inset-top, 0);
}

/* Responsive visibility — Tailwind sm:* utilities are not in the compiled bundle. */
.layout-nav-mobile-only {
  display: block;
}

.layout-nav-desktop-only {
  display: none;
}

.layout-nav-links-desktop {
  display: none;
  align-items: center;
  margin-left: 1.5rem;
  column-gap: 2rem;
}

.layout-nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 4rem;
  padding: 0.5rem 0;
}

.layout-nav-actions-desktop {
  display: none;
  align-items: center;
  flex-shrink: 0;
  column-gap: 0.75rem;
}

.layout-nav-exam-timestamp {
  display: none;
  color: #d1d5db;
  font-size: 0.875rem;
  line-height: 1.25rem;
}

.layout-nav-mobile-account {
  margin-top: 0.25rem;
  padding: 0.75rem 1rem 0.5rem;
  border-top: 1px solid var(--layout-border);
}

@media (min-width: 640px) {
  .layout-nav-mobile-only {
    display: none !important;
  }

  .layout-nav-desktop-only {
    display: flex;
    align-items: center;
  }

  .layout-nav-links-desktop {
    display: flex;
  }

  .layout-nav-bar {
    height: 4rem;
    padding: 0;
  }

  .layout-nav-actions-desktop {
    display: flex;
  }

  .layout-nav-exam-timestamp {
    display: inline;
  }
}

@media (min-width: 768px) {
  .layout-nav-exam-timestamp--wide {
    display: inline;
  }
}

.layout-nav-logo {
  display: block;
  height: 2.25rem;
  width: auto;
  max-width: 9rem;
  object-fit: contain;
}

@media (min-width: 640px) {
  .layout-nav-logo {
    height: 2.5rem;
    max-width: 11rem;
  }
}

.layout-skip-link {
  position: absolute;
  left: 0.75rem;
  top: env(safe-area-inset-top, 0);
  z-index: 100;
  transform: translateY(-120%);
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
  background-color: var(--layout-focus-ring);
  color: #ffffff;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform var(--layout-transition);
}

.layout-skip-link:focus {
  transform: translateY(0.75rem);
  outline: none;
  box-shadow: 0 0 0 2px var(--layout-surface-body), 0 0 0 4px var(--layout-focus-ring);
}

.layout-main {
  padding-bottom: max(1rem, env(safe-area-inset-bottom, 0));
}

.layout-nav-mobile-panel {
  width: min(100vw - 2rem, 18rem);
  padding-bottom: max(0.5rem, env(safe-area-inset-bottom, 0));
  transform-origin: top left;
  animation: layout-panel-in var(--layout-transition) cubic-bezier(0.25, 1, 0.5, 1);
}

.layout-nav-mobile-panel--align-right {
  transform-origin: top right;
}

@keyframes layout-panel-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.layout-nav-summary {
  list-style: none;
}

.layout-nav-summary::-webkit-details-marker {
  display: none;
}

.layout-nav-disclosure[open] > .layout-nav-summary {
  background-color: #374151;
  border-color: #6b7280;
}

.layout-nav-mobile-link {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.625rem 1rem;
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.25;
  text-decoration: none;
  transition: background-color var(--layout-transition), color var(--layout-transition);
}

.layout-nav-mobile-link:hover {
  text-decoration: none;
}

.layout-nav-mobile-link:focus {
  outline: none;
}

.layout-nav-mobile-link:focus-visible {
  background-color: #374151;
  box-shadow: inset 0 0 0 2px var(--layout-focus-ring);
}

.layout-nav-mobile-button {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 2.75rem;
  padding: 0.625rem 1rem;
  border: 0;
  background: transparent;
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.25;
  text-align: left;
  cursor: pointer;
  color: #d1d5db;
  transition: background-color var(--layout-transition), color var(--layout-transition);
}

.layout-nav-mobile-button:hover {
  background-color: #374151;
  color: #ffffff;
}

.layout-nav-mobile-button:focus {
  outline: none;
}

.layout-nav-mobile-button:focus-visible {
  background-color: #374151;
  box-shadow: inset 0 0 0 2px var(--layout-focus-ring);
}

.layout-scrollbar {
  scrollbar-color: var(--layout-scrollbar-thumb) var(--layout-scrollbar-track);
}

.layout-scrollbar::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.layout-scrollbar::-webkit-scrollbar-track {
  background: var(--layout-scrollbar-track);
  border-radius: 6px;
}

.layout-scrollbar::-webkit-scrollbar-thumb {
  background: var(--layout-scrollbar-thumb);
  border-radius: 6px;
}

.layout-scrollbar::-webkit-scrollbar-thumb:hover {
  background: var(--layout-scrollbar-thumb-hover);
}

@media (pointer: coarse) {
  .layout-touch-target {
    min-height: 2.75rem;
    min-width: 2.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .layout-nav-mobile-panel {
    animation: none !important;
    transition: none !important;
  }

  .layout-skip-link {
    transition: none !important;
  }
}