/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .hero-grid, .pricing-grid, .checkout-grid { grid-template-columns: 1fr; }
  .asset-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .idea-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .board-slots { grid-template-columns: none; grid-auto-flow: column; grid-auto-columns: minmax(150px, 22%); overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 6px; }
  .board-slot { scroll-snap-align: start; }
}
@media (max-width: 900px) {
  .nav-links {
    position: fixed; top: 70px; left: 16px; right: 16px; flex-direction: column; margin: 0; padding: 10px;
    background: var(--card); border: 1px solid var(--line-strong); border-radius: 14px; box-shadow: var(--shadow); display: none;
  }
  .nav-open .nav-links { display: flex; }
  .nav-link { width: 100%; padding: 12px; font-size: 15px; }
  .burger { display: inline-grid; }
  .nav-open .burger span:first-child { transform: translateY(2px) rotate(45deg); }
  .nav-open .burger span:last-child { transform: translateY(-2px) rotate(-45deg); }
  .faq-wrap { grid-template-columns: 1fr; gap: 0; }
  .steps { grid-template-columns: 1fr; }
  .steps::before { top: 28px; bottom: 28px; left: 27px; right: auto; border-top: 0; border-left: 2px dashed var(--line-strong); }
  .steps li { padding-left: 76px; min-height: 56px; }
  .step-n { position: absolute; left: 0; top: 0; }
  .steps h3 { margin-top: 2px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .legal-grid { grid-template-columns: 1fr; }
  .toc { position: static; max-height: none; margin-bottom: 24px; }
}
@media (max-width: 640px) {
  .nav { gap: 10px; }
  .brand span { display: none; }
  .nav-right .btn-sm { display: none; }
  #themeBtn { display: inline-grid; }
  .hero { padding-top: 104px; }
  .slot-bar { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .prompt-row { flex-direction: column; }
  .prompt-row .btn { width: 100%; }
  .board-slots { grid-auto-columns: 42%; }
  .asset-grid, .idea-grid { grid-template-columns: 1fr; }
  .section { padding: 76px 0; }
  .terms-row, .contact-grid, .topic-list { grid-template-columns: 1fr; }
  .timeline li { grid-template-columns: 1fr; gap: 2px; }
  .guarantee { flex-direction: column; }
  .summary-list > div { grid-template-columns: 1fr; gap: 2px; }
  .page-top { padding-top: 100px; }
  .plan-card { padding: 24px 18px; box-shadow: 5px 5px 0 color-mix(in srgb, var(--ember-shadow) 70%, transparent); }
  .footer-grid, .footer-list.two-col { grid-template-columns: 1fr; }
  .ws-actions .btn { flex: 1 1 45%; }
  .closing-actions .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}