/* App shell: sidebar | notes list | detail. */

.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: var(--z-toast);
  padding: var(--space-2) var(--space-4);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-overlay);
  transform: translateY(calc(-100% - var(--space-4)));
  transition: transform var(--duration-base) var(--ease-out);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.app {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

/* ---------- Sidebar ---------- */

.sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--color-surface-2);
  border-right: 1px solid var(--color-border);
}

.sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  height: var(--topbar-height);
  padding: 0 var(--space-3) 0 var(--space-4);
  flex: none;
}

.sidebar__body {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: var(--space-2) var(--space-3) var(--space-5);
}

.sidebar__foot {
  flex: none;
  padding: var(--space-3);
  border-top: 1px solid var(--color-border);
}

.sidebar-scrim {
  position: fixed;
  inset: 0;
  z-index: var(--z-scrim);
  background: var(--scrim);
  border: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-out);
}

/* ---------- Workspace ---------- */

.workspace {
  display: grid;
  grid-template-columns: var(--list-width) minmax(0, 1fr);
  min-width: 0;
  min-height: 0;
}

.list-pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
}

.list-pane__head {
  flex: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: var(--topbar-height);
  padding: 0 var(--space-2) 0 var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.list-pane__scroll {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.detail-pane {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--color-bg);
}

/* ---------- Tablet: sidebar becomes an overlay ---------- */

@media (max-width: 1080px) {
  .app {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: var(--z-sidebar);
    width: min(var(--sidebar-width), 84vw);
    transform: translateX(-102%);
    transition: transform var(--duration-slow) var(--ease-out);
    box-shadow: var(--shadow-overlay);
  }

  .app[data-sidebar="open"] .sidebar {
    transform: translateX(0);
  }

  .app[data-sidebar="open"] .sidebar-scrim {
    opacity: 1;
    pointer-events: auto;
  }
}

/* ---------- Mobile: one pane at a time ---------- */

@media (max-width: 760px) {
  .workspace {
    grid-template-columns: minmax(0, 1fr);
  }

  .list-pane,
  .detail-pane {
    grid-area: 1 / 1;
    border-right: 0;
  }

  .app[data-pane="list"] .detail-pane,
  .app[data-pane="detail"] .list-pane {
    display: none;
  }
}