/* ==========================================================================
   LAYOUT CONTAINERS
   ========================================================================== */

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: clamp(3rem, 6vw, 5rem);
  position: relative;
  z-index: 1;
}

.layout-shell,
.header-shell,
.section-shell {
  width: min(var(--max-content-width), calc(100% - 2 * var(--page-gutter)));
  margin: 0 auto;
  padding: 0 var(--page-gutter);
}

/* ==========================================================================
   HEADER & PRIMARY NAVIGATION
   ========================================================================== */

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(var(--space-sm), 2vw, var(--space-lg));
  flex-wrap: wrap;
}

#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(120deg, var(--color-primary), var(--color-secondary));
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.55);
  transition: width var(--transition-fast);
  z-index: 900;
}

.main-header {
  position: sticky;
  top: 0;
  z-index: 800;
  background: rgba(4, 6, 15, 0.65);
  backdrop-filter: blur(var(--blur-medium)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--blur-medium)) saturate(140%);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 10px 30px rgba(4, 6, 15, 0.45);
  /* Layout: keep header children on a single row when space allows */
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(var(--space-sm), 2vw, var(--space-md));
  padding: clamp(0.6rem, 1.6vw, 0.9rem) 0;
  min-height: var(--header-height);
  flex-wrap: nowrap;
}

body.theme-light .main-header,
body[data-theme="light"] .main-header {
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.12);
}

.logo-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex: 0 0 auto;
}

.logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  filter: drop-shadow(0 12px 26px rgba(99, 102, 241, 0.4));
}

.logo-text-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.logo-text {
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: linear-gradient(135deg, #ffffff 0%, rgba(34, 211, 238, 0.9) 40%, rgba(99, 102, 241, 0.9) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.logo-subtext {
  font-size: var(--text-xs);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.primary-nav {
  /* Allow the nav to take available central space without forcing layout wrap */
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(var(--space-xs), 1.4vw, var(--space-sm));
  flex: 1 1 auto;
  min-width: 0;
  padding: 0 var(--space-xs);
}

.primary-nav::-webkit-scrollbar {
  height: 6px;
}

.primary-nav::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.25);
  border-radius: var(--radius-pill);
}

.category-rail {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-pill);
  background: linear-gradient(120deg, rgba(15, 23, 42, 0.6), rgba(34, 211, 238, 0.08));
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-xs);
  justify-content: center;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex: 0 0 auto;
  flex-wrap: nowrap;
  justify-content: flex-end;
}

/* ==========================================================================
   GENRE TOOLBAR
   ========================================================================== */

.genre-toolbar {
  position: sticky;
  top: var(--filter-offset);
  z-index: 740;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: clamp(var(--space-sm), 2vw, var(--space-md));
  padding: clamp(0.45rem, 1.2vw, 0.75rem) var(--page-gutter);
  width: 100%;
}

/* Center the category rail and the genre dropdown trigger together.
   Use the existing .layout-shell as a horizontal flex container on larger
   viewports so the rail and the dropdown sit next to each other and are
   centered as a group. Responsive rules below will override for narrow
   screens (<= 992px). */
.genre-toolbar .layout-shell {
  /* Stack the category rail above the genre trigger and keep both
     centered as a group on larger viewports. Mobile rules under 992px
     still apply and will keep the existing responsive behavior. */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(var(--space-xxs), 1.2vw, var(--space-xs));
  width: min(var(--max-content-width), calc(100% - 2 * var(--page-gutter)));
  margin: 0 auto;
}

/* Prevent the dropdown group from forcing full width on desktop so it can
   sit beside the category rail; the responsive stylesheet will set it to
   100% for small screens. */
.genre-toolbar .genre-dropdown-group {
  width: auto;
  max-width: none;
  margin: 0;
}

.selected-genres {
  display: none; /* hidden by default; populated dynamically when genres selected */
}

.selected-genres button {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-primary);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: background var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
}

.selected-genres button:hover,
.selected-genres button:focus-visible {
  background: rgba(99, 102, 241, 0.22);
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-1px);
}

.selected-genre-badge::after {
  content: "×";
  font-weight: 600;
  font-size: 0.8em;
  opacity: 0.7;
  margin-left: 0.45rem;
}

body.theme-light .selected-genres button,
body[data-theme="light"] .selected-genres button {
  background: rgba(15, 23, 42, 0.08);
  border-color: rgba(148, 163, 184, 0.3);
  color: var(--color-text-primary);
}

body.theme-light .selected-genre-badge::after,
body[data-theme="light"] .selected-genre-badge::after {
  color: rgba(71, 85, 105, 0.65);
}

/* ==========================================================================
   MOVIE GRID & GENERAL LAYOUT
   ========================================================================== */

.movie-section {
  position: relative;
  padding: 0 0 clamp(4rem, 8vw, 6rem);
}

.section-shell {
  display: flex;
  flex-direction: column;
  gap: clamp(1.5rem, 3vw, 2rem);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.movies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--grid-gap);
}

.scroll-sentinel {
  width: 100%;
  height: 1px;
}

.back-to-top {
  position: fixed;
  right: clamp(1rem, 4vw, 2.25rem);
  bottom: clamp(1.5rem, 6vw, 3rem);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
  color: #ffffff;
  display: grid;
  place-items: center;
  border: none;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 850;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.app-layers {
  position: relative;
  z-index: 1000;
  pointer-events: none;
}

.app-layers > * {
  pointer-events: auto;
}