/* =========================================================
   MarxuBook — Layout : header, navigation, structure des pages
   ========================================================= */

.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}

.app-header__bar {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  max-width: 1180px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  color: var(--color-ink);
  text-decoration: none;
}
.brand__logo {
  display: block;
  width: clamp(150px, 18vw, 190px);
  height: 64px;
  object-fit: contain;
  object-position: left center;
}
.brand:focus-visible { outline-offset: 4px; }

/* Barre de recherche */
.search-bar {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-bg-muted);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: var(--space-2) var(--space-3);
  transition: border-color var(--dur-fast) var(--ease-standard);
}
.search-bar:focus-within {
  border-color: var(--color-primary);
}
.search-bar__icon { color: var(--color-ink-soft); flex-shrink: 0; }
.search-bar input {
  flex: 1;
  min-width: 0;
  border: none;
  background: transparent;
  font-size: var(--fs-md);
  color: var(--color-ink);
}
.search-bar input::placeholder { color: var(--color-ink-soft); }
.search-bar input:focus { outline: none; }

.mic-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--color-ink-soft);
  flex-shrink: 0;
  transition: background var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard);
}
.mic-btn:hover { background: var(--color-border); color: var(--color-primary); }
.mic-btn[aria-pressed="true"] {
  color: var(--color-primary-contrast);
  background: var(--color-primary);
  animation: pulse-mic 1.4s var(--ease-standard) infinite;
}
.mic-btn[disabled] { opacity: 0.4; cursor: not-allowed; }

@keyframes pulse-mic {
  0%, 100% { box-shadow: 0 0 0 0 rgb(var(--color-primary-rgb) / 0.35); }
  50% { box-shadow: 0 0 0 8px rgb(var(--color-primary-rgb) / 0); }
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--tap-min);
  height: var(--tap-min);
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--color-ink-soft);
  transition: background var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard);
}
.icon-btn:hover { background: var(--color-bg-muted); color: var(--color-primary); }

.avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-border);
  flex-shrink: 0;
}
.avatar--sm { width: 28px; height: 28px; }
.avatar--lg { width: 88px; height: 88px; border-width: 3px; }

/* Navigation principale */
.main-nav {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
}
.main-nav__list {
  display: flex;
  gap: var(--space-2);
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  overflow-x: auto;
}
.main-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-3);
  color: var(--color-ink-soft);
  font-weight: 600;
  font-size: var(--fs-sm);
  border-bottom: 3px solid transparent;
  white-space: nowrap;
  min-height: var(--tap-min);
}
.main-nav__link:hover { color: var(--color-primary); text-decoration: none; }
.main-nav__link[aria-current="page"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Contenu principal */
.app-main {
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-8);
  min-height: 60vh;
}

.page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.page-header p { color: var(--color-ink-soft); margin: 0; }

/* Grilles */
.grid-books {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-4);
}
.grid-cols-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 720px) {
  .grid-cols-2 { grid-template-columns: 2fr 1fr; align-items: start; }
}

.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}
@media (min-width: 860px) {
  .two-col { grid-template-columns: 260px 1fr; }
}

/* Pied de page */
.app-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) var(--space-4);
  color: var(--color-ink-soft);
  font-size: var(--fs-sm);
}
.app-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  align-items: center;
}
.app-footer nav {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Barre de nav mobile basse (facultative, ≤5 items) */
@media (max-width: 640px) {
  .app-header__bar { flex-wrap: wrap; }
  .search-bar { order: 3; width: 100%; }
}

.skeleton {
  background: linear-gradient(90deg, var(--color-bg-muted) 25%, var(--color-border) 37%, var(--color-bg-muted) 63%);
  background-size: 400% 100%;
  animation: skeleton-loading 1.4s ease infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-loading { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }
@media (prefers-reduced-motion: reduce) {
  .skeleton { animation: none; }
}