.ig-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  background: rgba(0, 0, 0, 0);
  transition: background 0.25s ease;
}
.ig-overlay[hidden] { display: none; }
.ig-overlay.is-open { background: rgba(0, 0, 0, 0.55); }

.ig-sheet {
  position: relative;
  width: 100%;
  max-width: 440px;
  max-height: 90dvh;
  overflow-y: auto;
  box-sizing: border-box;
  padding: 24px 20px calc(20px + env(safe-area-inset-bottom));
  border-radius: 22px 22px 0 0;
  background: var(--card, #fff);
  color: var(--ink, #171614);
  box-shadow: 0 -12px 40px rgba(0, 0, 0, 0.25);
  transform: translateY(100%);
  transition: transform 0.3s ease;
}
.ig-overlay.is-open .ig-sheet { transform: translateY(0); }

.ig-close {
  position: absolute;
  top: 10px;
  right: 12px;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 50%;
  background: var(--tint, #f0e8d8);
  color: var(--ink, #171614);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}
.ig-logo { display: block; width: 56px; height: 56px; border-radius: 14px; margin-bottom: 12px; }
.ig-sheet h2 { margin: 0 36px 6px 0; font-size: 1.3rem; line-height: 1.25; color: var(--ink, #171614); }
.ig-sub { margin: 0 0 16px; color: var(--muted, #716b61); font-size: 0.95rem; line-height: 1.45; }

.ig-tabs { display: flex; gap: 6px; padding: 4px; border-radius: 12px; background: var(--tint, #f0e8d8); }
.ig-tab {
  flex: 1;
  min-height: 40px;
  padding: 6px 2px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--muted, #716b61);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
}
.ig-tab[aria-selected="true"] { background: var(--card, #fff); color: var(--ink, #171614); box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15); }

.ig-steps { margin: 16px 0 0; padding: 0; list-style: none; counter-reset: ig; }
.ig-steps li {
  position: relative;
  min-height: 28px;
  margin-bottom: 12px;
  padding-left: 40px;
  line-height: 1.45;
  font-size: 0.95rem;
  counter-increment: ig;
}
.ig-steps li::before {
  content: counter(ig);
  position: absolute;
  left: 0;
  top: -1px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--btn, #171614);
  color: var(--btn-ink, #fff);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 28px;
  text-align: center;
}
.ig-icon { display: inline-block; vertical-align: -3px; margin: 0 2px; color: var(--brand, #9a772d); }
.ig-note { margin: 4px 0 0; padding: 10px 12px; border-radius: 10px; background: var(--tint, #f0e8d8); color: var(--ink, #171614); font-size: 0.88rem; line-height: 1.4; }

.ig-actions { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }
.ig-install, .ig-later { min-height: 46px; border-radius: 12px; font: inherit; font-weight: 700; cursor: pointer; }
.ig-install { border: 0; background: var(--btn, #171614); color: var(--btn-ink, #fff); }
.ig-install[hidden] { display: none; }
.ig-later { border: 1px solid var(--line, #e7e0d5); background: transparent; color: var(--ink, #171614); }

.ig-close:focus-visible, .ig-tab:focus-visible, .ig-install:focus-visible, .ig-later:focus-visible {
  outline: 3px solid var(--brand, #9a772d);
  outline-offset: 2px;
}

@media (min-width: 640px) {
  .ig-overlay { align-items: center; }
  .ig-sheet { border-radius: 22px; padding-bottom: 24px; transform: translateY(24px) scale(0.97); opacity: 0; transition: transform 0.25s ease, opacity 0.25s ease; }
  .ig-overlay.is-open .ig-sheet { transform: none; opacity: 1; }
  .ig-tab { font-size: 0.82rem; }
}

@media (prefers-reduced-motion: reduce) {
  .ig-overlay, .ig-sheet { transition: none; }
}