/**
 * layout.css
 * App shell structure only: sidebar / topbar / content grid and
 * responsive breakpoints. Visual surface styling (glass, glow) comes
 * from glass.css; this file positions things.
 *
 * Breakpoints:
 *   mobile   : < 768px  → sidebar hidden, bottom-nav shown
 *   tablet   : 768–1199px → sidebar collapses to icon rail
 *   desktop  : >= 1200px → full sidebar with labels
 */

.app-shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-areas: "sidebar main";
  min-height: 100vh;
}

/* ---- Sidebar ---- */
.sidebar {
  grid-area: sidebar;
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: var(--space-6) var(--space-3);
  border-radius: 0;
  border-inline-end: 1px solid var(--border-glass);
  z-index: var(--z-nav);
}

.sidebar-brand {
  padding: 0 var(--space-3) var(--space-6);
}

.sidebar-brand-text {
  font-size: var(--fs-lg);
  color: var(--text-primary);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar-nav-footer {
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-glass);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: background var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
}

.nav-item-active {
  color: var(--neon-cyan);
  background: rgba(0, 246, 255, 0.08);
  box-shadow: inset 3px 0 0 var(--neon-cyan);
}

html[dir='rtl'] .nav-item-active {
  box-shadow: inset -3px 0 0 var(--neon-cyan);
}

.nav-item-icon { display: flex; flex-shrink: 0; }

/* ---- Main column ---- */
.main-column {
  grid-area: main;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-6);
  border-radius: 0;
  border-bottom: 1px solid var(--border-glass);
}

.topbar-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
}

.topbar-search {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  max-width: 480px;
  color: var(--text-secondary);
}

.topbar-search input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-base);
}

.topbar-search input:focus { outline: none; }

.topbar-lang-btn {
  margin-inline-start: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.page-content {
  flex: 1;
  padding: var(--space-6);
}

/* ---- Bottom nav (mobile only) ---- */
.bottom-nav {
  display: none;
}

/* ---- Tablet: collapse sidebar to icon rail ---- */
@media (max-width: 1199px) {
  .app-shell {
    grid-template-columns: 76px 1fr;
  }
  .nav-item-label,
  .sidebar-brand-text {
    display: none;
  }
  .sidebar-brand,
  .nav-item {
    justify-content: center;
  }
}

/* ---- Mobile: hide sidebar, show bottom nav + hamburger ---- */
@media (max-width: 767px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-areas: "main";
    padding-bottom: 64px; /* space for fixed bottom nav */
  }

  .sidebar {
    position: fixed;
    inset-inline-start: 0;
    top: 0;
    width: 240px;
    transform: translateX(-100%);
    transition: transform var(--duration-base) var(--ease-standard);
  }

  html[dir='rtl'] .sidebar { transform: translateX(100%); }

  .sidebar.sidebar-open { transform: translateX(0); }

  .nav-item-label { display: inline; }
  .sidebar-brand-text { display: inline; }
  .nav-item { justify-content: flex-start; }

  .topbar-menu-btn { display: flex; }

  .bottom-nav {
    position: fixed;
    bottom: 0;
    inset-inline: 0;
    display: flex;
    justify-content: space-around;
    padding: var(--space-2);
    border-radius: 0;
    border-top: 1px solid var(--border-glass);
    z-index: var(--z-nav);
  }

  .bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    font-size: var(--fs-xs);
    color: var(--text-secondary);
    background: none;
    border: none;
    padding: var(--space-1);
  }

  .bottom-nav-item-active { color: var(--neon-cyan); }
}