/* ===========================================
   TMNT: Splintered Fate - Layout
   Two-panel layout, topbar, sidebar, responsive
   =========================================== */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--background);
  color: var(--foreground);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--transition-slow), color var(--transition-slow);
}

/* ---- Top Bar ---- */
#topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  height: var(--topbar-height);
  padding: 0 var(--sp-6);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-slow), border-color var(--transition-slow);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
}

.topbar-logo {
  height: 48px;
  width: auto;
  display: block;
}

.topbar-subtitle {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1px;
  white-space: nowrap;
}

.topbar-characters {
  display: flex;
  gap: var(--sp-2);
  flex: 1;
  justify-content: center;
  overflow-x: auto;
  scrollbar-width: none;
}

.topbar-characters::-webkit-scrollbar {
  display: none;
}

.topbar-right {
  display: flex;
  gap: var(--sp-2);
  flex-shrink: 0;
  align-items: center;
}

/* ---- Main Layout ---- */
#main {
  display: flex;
  height: calc(100vh - var(--topbar-height));
}

/* ---- Browse Panel ---- */
#browse-panel {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.tab-bar {
  display: flex;
  gap: var(--sp-1);
  padding: var(--sp-2) var(--sp-6);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  height: var(--tab-bar-height);
  align-items: center;
  flex-shrink: 0;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  background: var(--surface-elevated);
  border-bottom: 1px solid var(--border);
  align-items: center;
  flex-shrink: 0;
  min-height: var(--filter-bar-height);
}

.card-grid {
  flex: 1;
  overflow-y: auto;
  scrollbar-gutter: stable;
  padding: var(--sp-4) var(--sp-6);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--sp-3);
  align-content: start;
}

/* Inspirations tab: 2-column grid for character groups */
.card-grid.inspirations-grid {
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-4);
}

/* ---- Sidebar ---- */
#sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background var(--transition-slow), border-color var(--transition-slow);
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  letter-spacing: 1px;
  color: var(--primary);
}

#sidebar-content {
  flex: 1;
  overflow-y: auto;
  scrollbar-gutter: stable;
  padding: var(--sp-3) var(--sp-4);
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.sidebar-section {
  margin-bottom: var(--sp-4);
}

.sidebar-section:empty {
  display: none;
}

/* ---- Mobile Sidebar Toggle ---- */
.sidebar-toggle {
  display: none;
  position: fixed;
  bottom: var(--sp-4);
  right: var(--sp-4);
  z-index: var(--z-sidebar);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--primary-foreground);
  border: none;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
}

/* ---- Modal Overlay ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal-overlay);
  background: rgba(0, 0, 0, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--sp-6);
}

.modal-overlay.open {
  display: flex;
}

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 900px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-4) var(--sp-6);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  letter-spacing: 1px;
  color: var(--primary);
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-4) var(--sp-6);
}

.modal-actions {
  display: flex;
  gap: var(--sp-2);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border);
  margin-top: var(--sp-4);
}

.upgrades-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-6);
}

.upgrade-column-title {
  font-family: var(--font-display);
  font-size: var(--text-md);
  letter-spacing: 1px;
  color: var(--primary);
  margin-bottom: var(--sp-3);
}

/* ---- Responsive (mobile app UI takes over at 900px) ---- */
@media (max-width: 900px) {
  #topbar {
    padding: 0 var(--sp-3);
    gap: var(--sp-2);
  }

  .topbar-left {
    flex-direction: column;
    gap: 0;
  }

  .topbar-logo {
    height: 36px;
  }

  .topbar-subtitle {
    font-size: var(--text-xs);
  }

  .topbar-characters {
    display: none;
  }

  .card-grid {
    grid-template-columns: 1fr;
    padding: var(--sp-3);
  }

  .card-grid.inspirations-grid {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    padding: var(--sp-2) var(--sp-3);
  }

  .upgrades-columns {
    grid-template-columns: 1fr;
  }

  #sidebar {
    width: 100%;
  }
}