/* Learner navigation: a persistent index on wide screens, an explicit menu on touch. */
.mc-ui #topnav { position: sticky; inset-block-start: 0; z-index: 30; background: var(--color-surface-inverse); }
.mc-ui .tnav { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); min-block-size: 4.5rem; padding: var(--space-3) var(--layout-gutter); border-block-end: 1px solid var(--color-border-inverse); background: var(--color-surface-inverse); }
.mc-ui .tnav-brand { display: inline-flex; align-items: center; gap: var(--space-2); min-block-size: var(--control-height); color: var(--color-text-inverse); text-decoration: none; }
.mc-ui .tnav-mark { display: block; inline-size: var(--brand-mark-size); block-size: var(--brand-mark-size); }
.mc-ui .tnav-mark img { display: block; inline-size: 100%; block-size: 100%; }
.mc-ui .tnav-word { font: var(--brand-wordmark-weight) var(--brand-wordmark-size)/1 var(--font-wordmark); letter-spacing: var(--brand-tracking); }
.mc-ui .tnav-links { display: none; }
.mc-ui .tnav-link { display: flex; align-items: center; gap: var(--space-3); min-block-size: var(--control-height); padding: var(--space-3); border-radius: var(--radius-sm); color: var(--color-text-inverse-secondary); font-size: var(--type-label); font-weight: 500; text-decoration: none; }
.mc-ui .tnav-link[aria-current='page'] { background: var(--color-surface-inverse-selected); box-shadow: inset 3px 0 var(--color-accent-inverse); color: var(--color-text-inverse); font-weight: 600; }
.mc-ui .tnav-link-icon { inline-size: 1.125rem; block-size: 1.125rem; }
.mc-ui .tnav-secondary { margin-block-start: var(--space-4); padding-block-start: var(--space-3); border-block-start: 1px solid var(--color-border-inverse); }
.mc-ui .tnav-secondary-label { display: block; margin: var(--space-2) var(--space-3); color: var(--color-text-inverse-secondary); font-size: var(--type-caption); }
.mc-ui .tnav-right { display: flex; align-items: center; gap: var(--space-2); margin-inline-start: auto; }
.mc-ui .tnav-nav-toggle, .mc-ui .tnav-avatar, .mc-ui .tnav-up { display: inline-flex; align-items: center; justify-content: center; min-block-size: var(--control-height); padding: var(--space-2) var(--space-3); border: 1px solid var(--color-border-inverse); border-radius: var(--radius-sm); background: var(--color-surface-inverse); color: var(--color-text-inverse); font-size: var(--type-label); font-weight: 600; text-decoration: none; }
.mc-ui .tnav-nav-toggle { margin-inline-start: auto; }
.mc-ui .tnav-right { margin-inline-start: 0; }
.mc-ui .tnav-up { border-color: var(--color-brand); background: var(--color-brand); color: var(--color-text-inverse); }
.mc-ui .tnav-avatar { inline-size: var(--control-height); padding: var(--space-2); }
.mc-ui .tnav-avatar[aria-expanded='true'], .mc-ui .tnav-nav-toggle[aria-expanded='true'] { background: var(--color-surface-inverse-hover); border-color: var(--color-text-inverse-secondary); }
.mc-ui .tnav-account-name { display: none; }
.mc-ui .tnav-chip { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2); min-block-size: var(--control-height); color: var(--color-text-inverse-secondary); font-size: var(--type-caption); text-decoration: none; font-variant-numeric: tabular-nums; }
.mc-ui .tnav-days.is-warn { color: var(--color-warning-inverse); }
.mc-ui .tnav-usermenu { position: relative; }
.mc-ui .tnav-menu { position: absolute; inset-block-start: calc(100% + var(--space-2)); inset-inline-end: 0; inline-size: min(20rem, calc(100vw - var(--layout-gutter) * 2)); max-block-size: calc(100dvh - 6rem); overflow-y: auto; padding: var(--space-2); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface-elevated); color: var(--color-text); box-shadow: var(--shadow-overlay); z-index: 35; }
.mc-ui .tnav-menu-id { padding: var(--space-3); border-block-end: 1px solid var(--color-border); }
.mc-ui .tnav-menu-id b, .mc-ui .tnav-menu-id span { display: block; overflow-wrap: anywhere; }
.mc-ui .tnav-menu-id span { margin-block-start: var(--space-1); font-size: var(--type-caption); color: var(--color-text-secondary); }
.mc-ui .tnav-menu-item { display: flex; align-items: center; inline-size: 100%; min-block-size: var(--control-height); padding: var(--space-3); border: 0; border-radius: var(--radius-sm); background: transparent; color: var(--color-text); text-align: start; text-decoration: none; font-size: var(--type-label); }
.mc-ui #topnav :is(a, button):focus-visible { outline-color: var(--color-focus-inverse); }
.mc-ui #topnav .tnav-menu :is(a, button):focus-visible { outline-color: var(--color-focus); }
.mc-ui .tnav-menu-item:disabled { color: var(--color-disabled); }
.mc-ui .tnav-menu-status { padding: var(--space-3); font-size: var(--type-caption); color: var(--color-error); }
.mc-ui .tnav-daily-progress { margin: var(--space-3); padding-block-end: var(--space-3); border-block-end: 1px solid var(--color-border); }
.mc-ui .tnav-daily-progress__head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-2); color: var(--color-text-secondary); font-size: var(--type-caption); font-variant-numeric: tabular-nums; }
.mc-ui .tnav-daily-progress__svg { display: block; inline-size: 100%; block-size: .5rem; margin-block: var(--space-2); }
.mc-ui .tnav-daily-progress__track { fill: var(--color-border); }
.mc-ui .tnav-daily-progress__fill { fill: var(--color-brand); }
.mc-ui .tnav-daily-progress__complete { font-size: var(--type-caption); color: var(--color-success); }
.mc-ui .tnav-return { margin-inline-end: auto; color: var(--color-text-inverse-secondary); font-size: var(--type-label); }
.mc-ui .tnav-return:hover { color: var(--color-accent-inverse); }
.mc-ui .ai-coach-launcher--nav { position: static; inline-size: 100%; min-block-size: var(--control-height); margin-block-start: var(--space-3); padding: var(--space-3); border: 1px solid var(--color-border-inverse); border-radius: var(--radius-sm); background: var(--color-surface-inverse); color: var(--color-text-inverse-secondary); box-shadow: none; font: 500 var(--type-label)/1.4 var(--font-body); }
.mc-ui .ai-coach-launcher--nav .ai-coach-launcher__spark { display: none; }
.mc-ui .ai-coach-launcher--nav .ai-coach-launcher__count { margin-inline-start: auto; border-radius: var(--radius-xs); background: var(--color-surface-inverse-hover); color: var(--color-text-inverse-secondary); }
.mc-ui .skip-link { position: fixed; z-index: 40; inset-block-start: var(--space-2); inset-inline-start: var(--space-2); padding: var(--space-3); background: var(--color-surface-inverse); color: var(--color-text-inverse); translate: 0 -200%; }
.mc-ui .skip-link:focus { translate: 0; }
.mc-ui .is-nav-open { flex-wrap: wrap; }
.mc-ui .is-nav-open .tnav-links { display: block; order: 4; flex: 1 0 100%; max-block-size: calc(100dvh - 6rem); overflow-y: auto; padding-block: var(--space-3); }
@media (hover: hover) and (pointer: fine) {
  .mc-ui .tnav-menu-item:hover:not(:disabled) { background: var(--color-bg-subtle); color: var(--color-text); }
  .mc-ui .tnav-link:hover:not([aria-current]), .mc-ui .tnav-avatar:hover, .mc-ui .tnav-nav-toggle:hover { background: var(--color-surface-inverse-hover); color: var(--color-text-inverse); }
  .mc-ui .tnav-up:hover { background: var(--color-brand-hover); }
  .mc-ui .ai-coach-launcher--nav:hover { background: var(--color-surface-inverse-hover); }
}
@media (min-width: 1101px) {
  .mc-ui:not(.mc-focus) { padding-inline-start: var(--layout-rail); }
  .mc-ui:not(.mc-focus) #topnav { position: fixed; inset: 0 auto 0 0; inline-size: var(--layout-rail); border-inline-end: 1px solid var(--color-border-inverse); }
  .mc-ui:not(.mc-focus) .tnav { flex-direction: column; align-items: stretch; gap: var(--space-6); block-size: 100dvh; padding: var(--space-6) var(--space-3); border: 0; }
  .mc-ui:not(.mc-focus) .tnav-brand { padding-inline: var(--space-3); }
  .mc-ui:not(.mc-focus) .tnav-nav-toggle { display: none; }
  .mc-ui:not(.mc-focus) .tnav-links { display: block; flex: 1; min-block-size: 0; overflow-y: auto; }
  .mc-ui:not(.mc-focus) .tnav-right { flex-wrap: wrap; padding-block-start: var(--space-4); border-block-start: 1px solid var(--color-border-inverse); }
  .mc-ui:not(.mc-focus) .tnav-usermenu { flex: 1 0 100%; }
  .mc-ui:not(.mc-focus) .tnav-avatar { justify-content: flex-start; gap: var(--space-3); inline-size: 100%; }
  .mc-ui:not(.mc-focus) .tnav-account-name { display: block; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
  .mc-ui:not(.mc-focus) .tnav-initial { display: grid; place-items: center; flex: 0 0 1.75rem; block-size: 1.75rem; background: var(--color-surface-inverse-hover); border-radius: var(--radius-xs); }
  .mc-ui:not(.mc-focus) .tnav-menu { inset-block-start: auto; inset-block-end: calc(100% + var(--space-2)); inset-inline-start: 0; inset-inline-end: auto; }
}
@media (max-width: 480px) {
  .mc-ui .tnav { gap: var(--space-2); }
  .mc-ui .tnav-saved, .mc-ui .tnav-days, .mc-ui .tnav-up { display: none; }
  .mc-ui .tnav-return { flex-basis: 100%; order: 4; }
}
@media (prefers-reduced-motion: no-preference) {
  .mc-ui #topnav :is(a, button) { transition: color var(--duration-fast), background-color var(--duration-fast), border-color var(--duration-fast); }
}
@media (forced-colors: active) {
  .mc-ui .tnav-link[aria-current] { outline: 2px solid Highlight; }
}
@media print { .mc-ui #topnav { display: none; } .mc-ui:not(.mc-focus) { padding-inline-start: 0; } }