body {
  min-height: 100vh;
}

.app-shell {
  min-height: 100vh;
}

.app-frame {
  min-height: 100vh;
  padding-bottom: calc(var(--tabbar-height) + 124px);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  width: 100%;
  transition: border-color var(--duration-fast) var(--ease-standard);
}

.topbar-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-4);
  max-width: var(--content-width);
  margin: 0 auto;
  transition:
    min-height var(--duration-fast) var(--ease-standard),
    padding var(--duration-fast) var(--ease-standard);
}

.topbar[data-mode="compact-icon"] .topbar-inner {
  min-height: 62px;
}

.brand-slot {
  display: grid;
  align-items: center;
  min-width: 36px;
}

.brand-wordmark {
  grid-area: 1 / 1;
  width: clamp(142px, 28vw, 220px);
  height: auto;
  transition:
    opacity 200ms var(--ease-standard),
    transform 200ms var(--ease-standard),
    width 200ms var(--ease-standard);
}

.brand-icon {
  grid-area: 1 / 1;
  width: 36px;
  height: 36px;
  opacity: 0;
  transform: scale(0.86);
  transition:
    opacity 200ms var(--ease-standard),
    transform 200ms var(--ease-standard);
}

.topbar[data-mode="compact-icon"] .brand-wordmark {
  width: 0;
  opacity: 0;
  transform: translateY(-2px);
}

.topbar[data-mode="compact-icon"] .brand-icon {
  opacity: 1;
  transform: scale(1);
}

.topbar-actions {
  margin-left: auto;
}

.platform-rail {
  position: sticky;
  top: 78px;
  z-index: 24;
  padding: 0 var(--space-4) var(--space-2);
}

.platform-rail-list {
  max-width: var(--content-width);
  margin: 0 auto;
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
}

.platform-rail-list::-webkit-scrollbar {
  display: none;
}

.app-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-4);
}

.view-stack {
  display: grid;
  gap: var(--space-4);
}

.folders-grid,
.bookmarks-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.bottom-tabbar {
  position: fixed;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 34;
  padding: var(--space-2);
}

.bottom-tabbar-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
}

.floating-fab {
  position: fixed;
  bottom: calc(var(--tabbar-height) + 28px);
  z-index: 36;
}

.floating-fab--right {
  right: var(--space-4);
}

.floating-fab--left {
  left: var(--space-4);
}

.notice-strip {
  position: fixed;
  left: var(--space-3);
  right: var(--space-3);
  bottom: calc(var(--tabbar-height) + 96px);
  z-index: 35;
}

.modal-root {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal-root[data-open="true"] {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
}

.modal-panel {
  position: relative;
  width: min(100%, 680px);
  max-height: min(84vh, 920px);
  overflow: auto;
}

.modal-panel-detail {
  width: min(100%, 560px);
  max-height: min(82vh, 860px);
}

.page-section,
.page-section-tight {
  display: grid;
  gap: var(--space-4);
}

.page-section-tight {
  gap: var(--space-3);
}

@media (min-width: 390px) {
  .folders-grid,
  .bookmarks-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .app-content {
    padding: var(--space-5);
  }

  .folders-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .bookmarks-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .app-frame {
    padding-bottom: 56px;
  }

  .topbar-inner {
    padding: 0 var(--space-5);
  }

  .modal-root {
    padding: var(--space-6);
  }

  .modal-panel {
    width: min(100%, 760px);
  }

  .modal-panel-detail {
    width: min(100%, 680px);
  }

  .platform-rail {
    top: 78px;
    padding: 0 var(--space-5) var(--space-3);
  }

  .folders-grid {
    grid-template-columns: repeat(auto-fit, minmax(196px, 1fr));
    align-items: stretch;
  }

  .bookmarks-grid {
    grid-template-columns: repeat(auto-fit, minmax(188px, 1fr));
    align-items: stretch;
  }

  .folders-manager-grid {
    grid-template-columns: repeat(auto-fit, minmax(196px, 1fr));
    align-items: stretch;
  }

  .bottom-tabbar {
    display: none;
  }

  .floating-fab {
    bottom: 24px;
  }

  .floating-fab--right {
    right: var(--space-5);
  }

  .floating-fab--left {
    left: var(--space-5);
  }

  .notice-strip {
    left: calc(var(--space-5) + 88px);
    right: calc(var(--space-5) + 88px);
    bottom: 24px;
  }

  .modal-root {
    align-items: center;
  }
}