/* ============================================================
   Responsive overrides
   Mobile-first breakpoints layered on top of style.css
   ============================================================ */

/* ---------- Tablet & below: stack workspace, hide long email ---------- */
@media (max-width: 900px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .social-email {
    display: none;
  }

  .container {
    padding-inline: 20px;
  }
}

/* ---------- Mobile nav ---------- */
@media (max-width: 720px) {
  .header-inner {
    height: 64px;
  }

  .main-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 10px 20px 16px;
    box-shadow: var(--shadow-soft);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--dur-base) var(--ease-out),
                opacity var(--dur-base) var(--ease-out),
                visibility var(--dur-base);
  }

  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-link {
    padding: 12px 14px;
  }

  .header-social {
    position: fixed;
    top: auto;
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.is-open span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  .nav-toggle.is-open span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.is-open span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

/* ---------- Small phones ---------- */
@media (max-width: 480px) {
  .page-inner {
    padding-block: 36px 64px;
  }

  .page-heading h1 {
    font-size: 26px;
  }

  .page-sub {
    font-size: 14.5px;
  }

  .card {
    padding: 22px;
    border-radius: 16px;
  }

  .bit-input {
    font-size: 15px;
    letter-spacing: 0.08em;
  }

  .button-row {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .btn-text {
    order: 3;
  }

  .result-value {
    font-size: 18px;
  }

  .toast {
    left: 16px;
    right: 16px;
    transform: translateY(16px);
    text-align: center;
    justify-content: center;
  }

  .toast.show {
    transform: translateY(0);
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ---------- Large screens: a little extra breathing room ---------- */
@media (min-width: 1200px) {
  .workspace {
    grid-template-columns: 440px 1fr;
    gap: 28px;
  }
}