/* ============================================
   App Layout Shell
   ============================================ */
.app {
  display: flex;
  min-height: 100vh;
}

/* ============================================
   Sidebar (Desktop)
   ============================================ */
.sidebar {
  position: fixed; left: 0; top: 0; bottom: 0;
  width: var(--sidebar-width);
  background: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  display: flex; flex-direction: column;
  z-index: var(--z-sticky);
  transition: transform var(--transition-base);
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar__brand {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}
.sidebar__logo {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: var(--weight-bold);
  font-size: var(--text-lg);
}
.sidebar__brand-name {
  font-size: var(--text-lg); font-weight: var(--weight-bold);
  color: var(--text-primary);
}
.sidebar__brand-name span {
  color: var(--color-primary);
}

.sidebar__nav {
  flex: 1; padding: var(--space-3) var(--space-3);
  display: flex; flex-direction: column; gap: var(--space-1);
}
.sidebar__section-label {
  font-size: var(--text-xs); font-weight: var(--weight-semibold);
  color: var(--text-tertiary); text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-4) var(--space-3) var(--space-2);
}

.nav-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-sm); font-weight: var(--weight-medium);
  transition: all var(--transition-fast);
  text-decoration: none;
  position: relative;
}
.nav-item:hover {
  background: var(--bg-surface-secondary);
  color: var(--text-primary);
}
.nav-item.active {
  background: var(--color-primary-bg);
  color: var(--color-primary);
}
.nav-item.active::before {
  content: ''; position: absolute; left: -12px;
  top: 50%; transform: translateY(-50%);
  width: 4px; height: 24px;
  background: var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.nav-item__icon {
  width: 22px; height: 22px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; flex-shrink: 0;
}
.nav-item__badge {
  margin-left: auto;
  background: var(--color-danger);
  color: #fff;
  font-size: 10px; font-weight: var(--weight-bold);
  min-width: 18px; height: 18px;
  border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center;
  padding: 0 5px;
}

.sidebar__footer {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
}
.sidebar__user {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}
.sidebar__user:hover { background: var(--bg-surface-secondary); }
.sidebar__user-info { flex: 1; min-width: 0; }
.sidebar__user-name {
  font-size: var(--text-sm); font-weight: var(--weight-medium);
  color: var(--text-primary); white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.sidebar__user-plan {
  font-size: var(--text-xs); color: var(--text-tertiary);
}

/* ============================================
   Main Content Area
   ============================================ */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex; flex-direction: column;
}

/* Page Header */
.page-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky; top: 0;
  z-index: var(--z-sticky);
  gap: var(--space-4);
  min-height: var(--header-height);
}
.page-header__left {
  display: flex; align-items: center; gap: var(--space-4);
}
.page-header__title {
  font-size: var(--text-xl); font-weight: var(--weight-semibold);
}
.page-header__subtitle {
  font-size: var(--text-sm); color: var(--text-tertiary);
}
.page-header__right {
  display: flex; align-items: center; gap: var(--space-3);
}

/* Mobile menu button */
.menu-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.menu-toggle:hover {
  background: var(--bg-surface-secondary);
}

/* Page Content */
.page-content {
  flex: 1;
  padding: var(--space-6);
  max-width: var(--content-max-width);
  width: 100%;
}
.page-content--full { max-width: none; }
.page-content--centered {
  display: flex; align-items: center; justify-content: center;
}

/* Section */
.section { margin-bottom: var(--space-8); }
.section__header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: var(--space-4);
}
.section__title {
  font-size: var(--text-lg); font-weight: var(--weight-semibold);
}
.section__action {
  font-size: var(--text-sm); color: var(--color-primary);
  font-weight: var(--weight-medium);
  cursor: pointer;
}
.section__action:hover { text-decoration: underline; }

/* ============================================
   Bottom Navigation (Mobile)
   ============================================ */
.bottom-nav {
  display: none;
  position: fixed; bottom: 0; left: 0; right: 0;
  height: var(--bottom-nav-height);
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  z-index: var(--z-sticky);
  padding-bottom: env(safe-area-inset-bottom);
}
.bottom-nav__items {
  display: flex; height: 100%;
}
.bottom-nav__item {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 2px; color: var(--text-tertiary);
  font-size: 10px; font-weight: var(--weight-medium);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}
.bottom-nav__item:hover { color: var(--text-secondary); }
.bottom-nav__item.active { color: var(--color-primary); }
.bottom-nav__item.active::before {
  content: ''; position: absolute; top: 0;
  width: 24px; height: 3px;
  background: var(--color-primary);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}
.bottom-nav__icon {
  font-size: 1.25rem; line-height: 1;
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1023px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-xl);
  }

  .main-content {
    margin-left: 0;
    padding-bottom: calc(var(--bottom-nav-height) + env(safe-area-inset-bottom));
  }

  .bottom-nav { display: block; }
  .menu-toggle { display: flex; }

  .page-content {
    padding: var(--space-4);
  }
  .page-header {
    padding: var(--space-3) var(--space-4);
  }
}

@media (max-width: 767px) {
  .page-header__title {
    font-size: var(--text-lg);
  }
  .page-content {
    padding: var(--space-3);
  }

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

@media (min-width: 768px) and (max-width: 1023px) {
  .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================
   Two-Column Layout (Desktop)
   ============================================ */
.layout-split {
  display: flex; gap: var(--space-6); height: 100%;
}
.layout-split__main { flex: 1; min-width: 0; }
.layout-split__aside {
  width: 320px; flex-shrink: 0;
}

@media (max-width: 1023px) {
  .layout-split { flex-direction: column; }
  .layout-split__aside { width: 100%; }
}