/* ==========================================================================
   Paint Studio — Responsive Rules
   Breakpoints: 1024px (tablet), 768px (small tablet), 480px (mobile)
   ========================================================================== */

/* ---------- Tablet ---------- */
@media (max-width: 1024px) {
  .header-inner {
    padding: 14px 24px;
    gap: 24px;
  }

  .app {
    padding: 32px 24px 48px;
  }

  .toolbar {
    padding: 14px 16px;
  }

  .toolbar-size {
    min-width: 130px;
  }
}

/* ---------- Small tablet / large mobile ---------- */
@media (max-width: 860px) {
  .header-contact {
    display: none;
  }

  .main-nav {
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: 12px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
  }

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

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

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.is-active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .nav-toggle.is-active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.is-active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

/* ---------- Mobile ---------- */
@media (max-width: 640px) {
  .header-inner {
    padding: 12px 16px;
  }

  .logo-text {
    font-size: 16px;
  }

  .app {
    padding: 24px 16px 40px;
    gap: 18px;
  }

  .app-title {
    font-size: 22px;
  }

  .app-subtitle {
    font-size: 14px;
  }

  .toolbar {
    padding: 14px;
    gap: 12px;
    border-radius: var(--radius-md);
  }

  .toolbar-group {
    gap: 6px;
  }

  .toolbar-divider {
    display: none;
  }

  .tool-btn span,
  .ghost-btn span,
  .primary-btn span {
    display: none;
  }

  .tool-btn,
  .ghost-btn,
  .primary-btn {
    padding: 9px;
    width: 36px;
    height: 36px;
    justify-content: center;
  }

  .toolbar-size {
    min-width: 0;
    flex: 1 1 100%;
    order: 10;
  }

  .toolbar-size input[type="range"] {
    flex: 1;
    width: auto;
  }

  .toolbar-actions {
    margin-left: 0;
    flex: 1 1 100%;
    order: 11;
    justify-content: flex-end;
  }

  .canvas-wrap {
    min-height: 50vh;
    border-radius: var(--radius-md);
    padding: 6px;
  }

  #paintCanvas {
    min-height: 48vh;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 24px 16px 32px;
  }

  .toast {
    left: 16px;
    right: 16px;
    transform: translateY(20px);
    bottom: 20px;
  }

  .toast.is-visible {
    transform: translateY(0);
  }
}

/* ---------- Very small phones ---------- */
@media (max-width: 380px) {
  .toolbar-color .control-label {
    display: none;
  }
}