/* ============================================================
   App shell / chrome — the authenticated top nav, sidebar drawer,
   global-search dialog, flash toast, lightbox and unauthenticated
   header. Replaces the Tailwind utility soup + inline token styles
   in layouts/application.html.erb (and shared with marketing).

   Breakpoints here intentionally mirror Tailwind's exact pixel
   values (sm 40rem, md 48rem, lg 64rem) rather than the app-wide
   single 48rem, because the sidebar/drawer boundary was authored at
   lg and collapsing it would move the drawer→sidebar switch.
   ============================================================ */

/* ---------- Top navigation bar ---------- */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.app-header__nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  padding-left: var(--space-4);
  padding-right: var(--space-8);
}
@media (max-width: 64rem) {
  .app-header__nav { padding-right: var(--space-4); }
}

.app-hamburger {
  border-radius: var(--radius-lg);
  padding: var(--space-1);
}
.app-hamburger:focus { outline: none; }
@media (min-width: 64rem) {
  .app-hamburger { display: none; }
}

/* Mobile-only centered logo (hidden once the sidebar appears). */
.app-logo-mobile { display: block; }
@media (min-width: 64rem) {
  .app-logo-mobile { display: none; }
}
.app-logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  margin: calc(var(--space-2) * -1);
  border-radius: var(--radius-lg);
}
.app-logo-link:focus { outline: none; }
.app-logo-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--space-8);
  height: var(--space-8);
  border-radius: var(--radius-xl);
  font-size: var(--txt-base);
  font-weight: var(--weight-black);
  background: var(--accent);
  color: var(--accent-on);
}
.app-logo-badge--lg {
  width: var(--space-9);
  height: var(--space-9);
  font-size: var(--txt-lg);
}
.app-logo-text {
  font-size: var(--txt-lg);
  font-weight: var(--weight-black);
  letter-spacing: var(--tracking-tight);
  color: var(--txt);
}
.app-logo-text--xl { font-size: var(--txt-xl); }

.app-nav-spacer { display: none; }
@media (min-width: 64rem) {
  .app-nav-spacer { display: block; flex: 1; }
}
.app-nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  justify-content: flex-end;
}
@media (min-width: 48rem) {
  .app-nav-actions { gap: var(--space-4); }
}
.app-search { display: flex; align-items: center; }
.app-search-btn {
  padding: var(--space-2);
  border-radius: var(--radius-lg);
}
@media (min-width: 48rem) {
  .app-search-btn { display: none; }
}
.app-search-desktop { display: none; }
@media (min-width: 48rem) {
  .app-search-desktop { display: flex; align-items: center; }
}
.app-search-field {
  position: relative;
  width: 20rem;
}
.app-search-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}
.app-search-input {
  width: 100%;
  padding: var(--space-2) var(--space-16) var(--space-2) var(--space-10);
  font-size: var(--txt-sm);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--surface-2);
  color: var(--txt);
  cursor: pointer;
}
.app-search-input:focus { outline: none; }
.app-search-kbd {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}

/* ---------- Global-search dialog ---------- */
.app-search-dialog {
  padding: 0;
  border: 0;
  background: transparent;
}
.app-search-panel {
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}
.app-search-header {
  border-bottom: 1px solid var(--border);
  padding: var(--space-4);
}
.app-search-dialog-input {
  width: 100%;
  padding: var(--space-2) var(--space-4) var(--space-2) var(--space-10);
  font-size: var(--txt-sm);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-2);
  color: var(--txt);
}
.app-search-dialog-input:focus { outline: none; }
.app-search-results {
  position: relative;
  padding: var(--space-4);
  max-height: 25vh;
  overflow-y: auto;
}
@media (min-width: 40rem) {
  .app-search-results { max-height: 60vh; }
}
.app-search-spinner-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  background: color-mix(in srgb, var(--surface) 80%, transparent);
}
/* This rule is unlayered, so its `display: flex` beats the `.hidden` utility
   (which lives in @layer utilities). Without this explicit override the
   JS-toggled `hidden` class can't hide the overlay, so the loading spinner
   stays visible after the search results load. */
.app-search-spinner-overlay.hidden { display: none; }
.app-search-empty {
  text-align: center;
  padding-block: var(--space-12);
}
.app-search-empty__icon {
  display: block;
  margin-inline: auto;
  width: var(--space-12);
  height: var(--space-12);
  margin-bottom: var(--space-3);
}
.app-search-empty__text {
  font-size: var(--txt-sm);
  font-style: italic;
}
.app-search-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-2) var(--space-4);
  background: var(--surface-2);
}
.app-search-footer__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--txt-xs);
}

/* Spinner (SVG stroke-arc), shared by the search dialog. */
.app-spinner {
  width: var(--space-8);
  height: var(--space-8);
  animation: app-spin 1s linear infinite;
}
@keyframes app-spin {
  to { transform: rotate(360deg); }
}
.spinner-track { opacity: 0.25; }
.spinner-head { opacity: 0.75; }

/* ---------- Sidebar drawer ---------- */
.app-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  background: rgb(0 0 0 / 0.45);
}
@media (min-width: 64rem) {
  .app-backdrop { display: none; }
}
.app-drawer {
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 16rem;
  border-right: 1px solid var(--border);
  z-index: 40;
  transform: translateX(-100%);
  transition: transform 0.3s ease-in-out;
  padding-top: var(--space-16);
  background: var(--surface);
}
.app-drawer.app-drawer--open { transform: translateX(0); }
@media (min-width: 64rem) {
  .app-drawer {
    transform: translateX(0);
    padding-top: 0;
  }
}
.app-drawer__inner {
  display: flex;
  flex-direction: column;
  height: 100%;
}
.app-drawer__logo {
  display: none;
  align-items: center;
  padding-inline: var(--space-6);
  height: 72px;
}
@media (min-width: 64rem) {
  .app-drawer__logo { display: flex; }
}
.app-nav-list {
  flex: 1;
  padding: var(--space-6) var(--space-4);
}
.app-nav-list__items {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.app-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-radius: var(--radius-xl);
  padding: var(--space-2-5) var(--space-3);
  font-size: var(--txt-sm);
  font-weight: var(--weight-medium);
}
.app-nav-link__badge {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: var(--space-5);
  height: var(--space-5);
  padding-inline: var(--space-1-5);
  border-radius: var(--radius-full);
  font-size: var(--txt-xs);
  font-weight: var(--weight-semibold);
  background: var(--accent);
  color: var(--accent-on);
}

/* Body scroll lock while the mobile drawer is open. */
.app-scroll-locked { overflow: hidden; }
@media (min-width: 64rem) {
  .app-scroll-locked { overflow: auto; }
}

/* ---------- Main content offset + footer ---------- */
.app-main {
  padding: var(--space-2) var(--space-2) var(--space-8);
}
@media (min-width: 48rem) {
  .app-main { padding: var(--space-4) var(--space-8) var(--space-8); }
}
.app-content { padding-top: 4.5rem; }
@media (min-width: 64rem) {
  .app-content { margin-left: 16rem; }
}
.app-footer {
  text-align: center;
  margin-block: var(--space-6);
}

/* ---------- User menu (nav_user_actions) ---------- */
.user-menu-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--weight-medium);
  padding: var(--space-2);
  border-radius: var(--radius-lg);
  transition: background-color 0.15s ease;
}
.user-menu-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--space-8);
  height: var(--space-8);
  border-radius: var(--radius-full);
  font-weight: var(--weight-semibold);
  font-size: var(--txt-sm);
  background: var(--accent);
  color: var(--accent-on);
}
.user-menu {
  margin-top: var(--space-2);
  width: 18rem;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 50;
}
.user-menu__section {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
}
.user-menu__label {
  font-size: var(--txt-xs);
  margin-bottom: var(--space-2);
}
.user-menu__theme {
  display: flex;
  gap: var(--space-1);
  padding: var(--space-1);
  border-radius: var(--radius-lg);
}
.user-menu__theme-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
}
.user-menu__theme-label {
  font-size: var(--txt-xs);
  font-weight: var(--weight-medium);
}
.user-menu__signout {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--txt-sm);
  border-radius: 0 0 var(--radius-2xl) var(--radius-2xl);
  cursor: pointer;
  width: 100%;
  text-align: left;
  color: var(--neg);
}

/* ---------- Unauthenticated header ---------- */
.guest-header { border-bottom: 1px solid var(--border); }
.guest-header__nav {
  margin-inline: auto;
  max-width: 64rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
}
.guest-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.guest-signin {
  font-weight: var(--weight-medium);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-lg);
  transition: background-color 0.15s ease;
}
.guest-cta {
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  font-size: var(--txt-sm);
  font-weight: var(--weight-bold);
  white-space: nowrap;
  cursor: pointer;
}
.guest-cta:focus { outline: none; }

/* ---------- Flash toast ---------- */
.flash-toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%) scale(0.95);
  z-index: 50;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  max-width: 28rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  opacity: 0;
  transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}
.flash-toast--visible {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}
.flash-toast__message { flex: 1; }
.flash-toast__close {
  margin-left: var(--space-2);
  font-weight: var(--weight-bold);
  font-size: var(--txt-lg);
}
.flash-toast__close:focus { outline: none; }

/* ---------- Keyboard-shortcut help dialog ---------- */
.shortcut-help {
  padding: 0;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 28rem;
  width: 90vw;
}
.shortcut-help::backdrop {
  background: rgb(0 0 0 / 0.5);
}
.shortcut-help__body { padding: var(--space-6); }
.shortcut-help__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}
.shortcut-help__title {
  font-size: var(--txt-lg);
  font-weight: var(--weight-semibold);
}
.shortcut-help__close {
  margin-top: calc(var(--space-1) * -1);
  margin-right: calc(var(--space-2) * -1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius);
}
.shortcut-help__close:hover { opacity: 0.8; }
.shortcut-help__close:focus { outline: none; }
.shortcut-help__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: var(--txt-sm);
}
.shortcut-help__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.shortcut-help__label { color: var(--txt); }
.shortcut-help__keys {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.shortcut-help__sep { font-size: var(--txt-xs); }
.shortcut-help__sep--slash { margin-inline: var(--space-1); }
.shortcut-help__kbd {
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius);
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--txt);
}
.shortcut-help__footer {
  margin-top: var(--space-5);
  font-size: var(--txt-xs);
}

/* ---------- Confirm dialog (reuses .assign-modal + .assign-modal__btn) ---------- */
.confirm-dialog { max-width: 28rem; }
.confirm-dialog__body { padding: var(--space-6); }
.confirm-dialog__title {
  font-size: var(--txt-xl);
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-2);
}
.confirm-dialog__message {
  font-size: var(--txt-sm);
  margin-bottom: var(--space-6);
}
.confirm-dialog__actions {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
}

/* ---------- Lightbox ---------- */
.lightbox__close {
  z-index: 60;
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  list-style: none;
  cursor: pointer;
  color: var(--on-scrim);
}
.lightbox__backdrop {
  z-index: 50;
  position: fixed;
  inset: 0;
  background: var(--scrim);
}
.lightbox__figure {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100vw;
  max-width: 100vw;
  height: 100vh;
  max-height: 75vw;
  padding: 0;
  display: flex;
  justify-content: center;
}
@media (min-width: 40rem) {
  .lightbox__figure { padding: var(--space-20); }
}
.lightbox__image { max-height: 100%; }
.lightbox__iframe { width: 100%; height: 100%; }