/* Meca Admin UI — Layout v3.0 — Light Theme */

/* === APP SHELL === */

.app-layout {
  display: flex;
  min-height: 100vh;
  background: var(--bg-page);
}

/* === SIDEBAR === */

.app-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-default);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: var(--z-sticky);
  transition: transform var(--transition-slow);
}

/* === MAIN CONTENT AREA === */

.app-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-width: 0;
}

/* === PAGE CONTENT === */

.app-content {
  flex: 1;
  padding: var(--content-padding);
  max-width: var(--content-max-width);
  width: 100%;
  margin: 0 auto;
}

.app-content.full-width {
  max-width: none;
}

/* === PAGE STRUCTURE === */

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-8);
  gap: var(--space-4);
}

.page-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--color-navy);
  line-height: var(--leading-tight);
}

.page-subtitle {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

.page-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

/* === SECTION === */

.section {
  margin-bottom: var(--space-8);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  gap: var(--space-4);
}

.section-title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
}

/* === GRIDS === */

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

/* === FLEX UTILITIES === */

.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-start { display: flex; align-items: center; justify-content: flex-start; }
.flex-end { display: flex; align-items: center; justify-content: flex-end; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-between { justify-content: space-between; }
.flex-1 { flex: 1; }
.flex-shrink-0 { flex-shrink: 0; }
.flex-wrap { flex-wrap: wrap; }

/* === GAPS === */

.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-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* === SPACING UTILITIES === */

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* === DIVIDER === */

.divider {
  height: 1px;
  background: var(--border-default);
  margin: var(--space-4) 0;
}

/* === RESPONSIVE — Tablet (< 1024px) === */

@media (max-width: 1024px) {
  .app-sidebar {
    width: var(--sidebar-width-collapsed);
  }

  .app-main {
    margin-left: var(--sidebar-width-collapsed);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* === RESPONSIVE — Mobile (< 768px) === */

@media (max-width: 768px) {
  .app-sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-width);
    z-index: var(--z-overlay);
  }

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

  .app-main {
    margin-left: 0;
  }

  .app-content {
    padding: var(--space-4);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Mobile overlay backdrop */
  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    z-index: calc(var(--z-overlay) - 1);
  }

  .sidebar-backdrop.visible {
    display: block;
  }
}

/* === LOGIN LAYOUT === */

.login-layout {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-login);
  position: relative;
  overflow: hidden;
}

.login-layout::before {
  content: '';
  position: absolute;
  top: -30%;
  left: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(ellipse, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.login-layout::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(ellipse, rgba(34, 211, 238, 0.08) 0%, transparent 70%);
  pointer-events: none;
}