/* PWA install prompt — sits above bottom nav; never blocks lesson/fullscreen */

.pwa-install {
  --pwa-install-bg: rgba(8, 14, 28, 0.96);
  --pwa-install-border: rgba(255, 255, 255, 0.1);
  --pwa-install-text: #ffffff;
  --pwa-install-muted: #8b95a8;
  --pwa-install-accent: #9bb832;
  --pwa-install-accent-text: #0a1000;
  --pwa-install-radius: 18px;

  position: fixed;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  width: calc(100% - 24px);
  max-width: calc(var(--main-app-width, 390px) - 24px);
  z-index: 95;
  bottom: calc(16px + env(safe-area-inset-bottom, 0px));
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.35s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  box-sizing: border-box;
}

/* Above bottom navigation when footer is visible */
body:not(.page-login):not(.page-intro) .pwa-install {
  bottom: calc(var(--main-footer-h, 76px) + 10px + env(safe-area-inset-bottom, 0px));
}

.pwa-install.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.pwa-install__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px 14px 12px;
  border-radius: var(--pwa-install-radius);
  background: var(--pwa-install-bg);
  border: 1px solid var(--pwa-install-border);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  color: var(--pwa-install-text);
  direction: rtl;
  font-family: 'Vazirmatn', system-ui, sans-serif;
}

.pwa-install__top {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.pwa-install__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, rgba(155, 184, 50, 0.22), rgba(75, 38, 159, 0.28));
  border: 1px solid rgba(155, 184, 50, 0.28);
  color: var(--pwa-install-accent);
}

.pwa-install__icon svg {
  width: 22px;
  height: 22px;
  display: block;
}

.pwa-install__copy {
  flex: 1;
  min-width: 0;
}

.pwa-install__title {
  margin: 0 0 4px;
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--pwa-install-text);
}

.pwa-install__text {
  margin: 0;
  font-size: 0.75rem;
  line-height: 1.55;
  color: var(--pwa-install-muted);
}

.pwa-install__close {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  margin: -4px -4px 0 0;
  border: none;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--pwa-install-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background 0.2s ease, color 0.2s ease;
}

.pwa-install__close:hover,
.pwa-install__close:focus-visible {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  outline: none;
}

.pwa-install__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pwa-install__btn {
  flex: 1;
  min-height: 42px;
  padding: 0 14px;
  border: none;
  border-radius: 12px;
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease, background 0.15s ease;
}

.pwa-install__btn:active {
  transform: scale(0.98);
}

.pwa-install__btn--primary {
  background: var(--pwa-install-accent);
  color: var(--pwa-install-accent-text);
}

.pwa-install__btn--primary:hover,
.pwa-install__btn--primary:focus-visible {
  filter: brightness(1.06);
  outline: none;
}

.pwa-install__btn--ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--pwa-install-muted);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.pwa-install__btn--ghost:hover,
.pwa-install__btn--ghost:focus-visible {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  outline: none;
}

.pwa-install__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.pwa-install__steps li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--pwa-install-muted);
}

.pwa-install__steps b {
  color: #d7deea;
  font-weight: 600;
}

.pwa-install__step-num {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--pwa-install-accent-text);
  background: var(--pwa-install-accent);
  margin-top: 1px;
}

/* Never interrupt immersive lesson / fullscreen playback */
body.page-lesson.lesson-is-playing .pwa-install,
body.lesson-landscape-immersive .pwa-install,
body.lesson-chrome-collapsed .pwa-install,
html:fullscreen .pwa-install,
html:-webkit-full-screen .pwa-install,
body:has(:fullscreen) .pwa-install,
body:has(:-webkit-full-screen) .pwa-install,
body:has(.video-js.vjs-fullscreen) .pwa-install,
body:has(.shaka-video-container:fullscreen) .pwa-install {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  .pwa-install {
    transition: none;
  }
}