/* ============================================================
   NoorAlFajr — Layout System
   Header, Sidebar, Main content, Bottom nav
   ============================================================ */

/* ─── App Shell ─── */
.app-shell {
  display: grid;
  grid-template-rows: var(--header-h) 1fr;
  grid-template-columns: 1fr;
  min-height: 100dvh;
}

/* ─── Header ─── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  z-index: var(--z-header);
  transition: box-shadow var(--transition-normal);
}
.site-header.scrolled { box-shadow: var(--shadow-md); }
.site-header.dark {
  background: rgba(17,24,39,0.92);
  border-bottom-color: rgba(255,255,255,0.08);
}

/* ─── Logo Area ─── */
.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}
.header-logo img { width: 36px; height: 36px; }
.header-logo .logo-text {
  font-family: var(--font-arabic);
  font-size: 1.3rem;
  color: var(--primary-700);
  font-weight: var(--fw-bold);
}
.header-logo .logo-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-bengali);
  display: none;
}
@media (min-width: 480px) { .header-logo .logo-sub { display: block; } }

/* ─── Header Actions ─── */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.header-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: var(--radius-lg);
  color: var(--gray-600);
  font-size: 1.2rem;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.header-btn:hover {
  background: var(--primary-50);
  color: var(--primary-600);
  text-decoration: none;
}

/* ─── Desktop Sidebar ─── */
@media (min-width: 1024px) {
  .app-shell {
    grid-template-columns: var(--nav-w) 1fr;
  }
  .site-sidebar {
    grid-column: 1;
    grid-row: 1 / -1;
    position: fixed;
    top: var(--header-h);
    left: 0;
    width: var(--nav-w);
    height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    background: var(--color-bg-card);
    border-right: 1px solid var(--color-border);
    padding: var(--space-4) var(--space-3);
  }
  .site-main { grid-column: 2; }
  .bottom-nav { display: none; }
}

/* ─── Navigation ─── */
.nav-section { margin-bottom: var(--space-6); }
.nav-section-title {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--ls-widest);
  font-weight: var(--fw-semibold);
  color: var(--color-text-light);
  padding: var(--space-1) var(--space-3);
  margin-bottom: var(--space-1);
}
.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-lg);
  color: var(--gray-600);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  transition: all var(--transition-fast);
  text-decoration: none;
}
.nav-link .nav-icon { font-size: 1.1rem; width: 1.5rem; text-align: center; }
.nav-link:hover {
  background: var(--primary-50);
  color: var(--primary-700);
  text-decoration: none;
}
.nav-link.active {
  background: var(--primary-100);
  color: var(--primary-700);
  font-weight: var(--fw-semibold);
}
.nav-link .badge {
  margin-left: auto;
  background: var(--primary-500);
  color: white;
  font-size: 0.65rem;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  font-weight: var(--fw-bold);
}

/* ─── Main Content ─── */
.site-main {
  padding-top: calc(var(--header-h) + var(--space-6));
  padding-bottom: calc(var(--bottom-nav-h) + var(--space-6));
  min-height: 100dvh;
}

/* ─── Container ─── */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
.container-sm  { max-width: var(--container-sm); }
.container-md  { max-width: var(--container-md); }
.container-lg  { max-width: var(--container-lg); }

/* ─── Grid Layouts ─── */
.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
.grid-3 { grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.grid-4 { grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: var(--space-4); }
.grid-auto-sm { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: var(--space-4); }

@media (max-width: 767px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .grid-2 { grid-template-columns: 1fr; }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ─── Flex Utilities ─── */
.flex          { display: flex; }
.flex-col      { flex-direction: column; }
.flex-wrap     { flex-wrap: wrap; }
.items-center  { align-items: center; }
.items-start   { align-items: flex-start; }
.items-end     { align-items: flex-end; }
.justify-center{ justify-content: center; }
.justify-between{ justify-content: space-between; }
.justify-end   { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ─── Bottom Navigation (Mobile) ─── */
.bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--bottom-nav-h);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-around;
  z-index: var(--z-header);
  padding-bottom: env(safe-area-inset-bottom, 0);
}
.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-2);
  border-radius: var(--radius-lg);
  color: var(--color-text-muted);
  font-size: 0.65rem;
  font-weight: var(--fw-medium);
  transition: all var(--transition-fast);
  text-decoration: none;
  min-width: 52px;
}
.bottom-nav-item .nav-icon { font-size: 1.4rem; }
.bottom-nav-item.active { color: var(--primary-600); }
.bottom-nav-item:hover { color: var(--primary-600); }

/* ─── Page Sections ─── */
.page-hero {
  background: var(--gradient-hero);
  padding: var(--space-16) var(--space-4);
  text-align: center;
  color: white;
  position: relative;
  overflow: hidden;
}
.page-section { padding: var(--space-12) 0; }
.page-section-alt { padding: var(--space-12) 0; background: var(--color-bg-sidebar); }

/* ─── Dividers ─── */
.divider { height: 1px; background: var(--color-border); margin: var(--space-4) 0; }
.divider-gold { background: var(--gradient-gold); }

/* ─── Safe area ─── */
.safe-bottom { padding-bottom: env(safe-area-inset-bottom, var(--space-4)); }