/* ============================================================
   responsive.css — tablet + touch pass (loaded after base CSS)
   Additive only: overrides base rules by cascade order.
   Targets: desktop (mouse) and iPad-class tablets (touch).
   ============================================================ */

/* Use dynamic viewport height so the iPadOS Safari toolbar doesn't
   cause height jump/clipping. Falls back to 100vh where unsupported. */
#app { height: 100vh; height: 100dvh; }

/* ── Off-canvas sidebar drawer below 1024px ─────────────────
   Desktop (>1024) keeps the persistent sidebar untouched. */
@media (max-width: 1024px) {
  .topbar-nav { display: none; }

  .sidebar {
    position: fixed;
    top: 56px;                 /* below the topbar */
    left: 0;
    bottom: 0;
    width: 280px;
    max-width: 82vw;
    transform: translateX(-100%);
    transition: transform var(--ease-in-out);
    z-index: var(--z-modal);
    box-shadow: var(--shadow-xl);
    overflow-y: auto;
  }
  .sidebar.open { transform: translateX(0); }

  .sidebar-backdrop {
    position: fixed;
    inset: 56px 0 0 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--ease-base), visibility var(--ease-base);
    z-index: var(--z-overlay);
  }
  .sidebar-backdrop.visible { opacity: 1; visibility: visible; }

  .hamburger { display: inline-flex !important; }
}

/* Hamburger hidden on desktop (shown only in the drawer breakpoint). */
.hamburger { display: none; }

/* ── Touch: 44px minimum targets (Apple HIG) ────────────────── */
@media (pointer: coarse) {
  .icon-btn,
  .hamburger { min-width: 44px; min-height: 44px; }
  .sidebar-link { min-height: 44px; display: flex; align-items: center; }
  .nav-pill { min-height: 40px; display: inline-flex; align-items: center; }
  /* Transport + generic control buttons */
  .anim-play, .qa-chip, .biz-view-btn, .biz-mode-btn,
  .sim-scenario, .quiz-option { min-height: 40px; }
  .anim-scrub { height: 24px; }
}

/* ── Kill "sticky hover" on touch; give an :active press instead ─ */
@media (hover: none) {
  .card-hover:hover, .topic-card:hover, .map-node:hover,
  .quiz-option:hover, .sim-scenario:hover, .qa-chip:hover {
    transform: none;
  }
  .card-hover:active, .topic-card:active, .map-node:active {
    transform: scale(0.99);
  }
}

/* ── Stack multi-column module layouts on narrow/portrait ───── */
@media (max-width: 860px) {
  .arch-layout,
  .two-col-code,
  .var-compare,
  .metrics-grid,
  .biz-controls-row { grid-template-columns: 1fr; }
  .biz-controls-row { display: flex; flex-direction: column; align-items: stretch; gap: var(--space-3); }
  .gloss-list { grid-template-columns: 1fr; }
  /* Detail panels stop being sticky so they don't overlap when stacked. */
  .arch-detail { position: static; }
}

/* ── Global reduced-motion honor ────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}