/* ==========================================================================
   TubeCraft AI — Responsive & Mobile Viewport Stylesheet
   ========================================================================== */

/* Medium Devices (Tablets, < 1024px) */
@media (max-width: 1024px) {
  .studio-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .studio-controls-sidebar {
    max-height: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* Small Devices (Mobile Phones, < 768px) */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.2rem; }

  .mobile-menu-btn {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(11, 15, 23, 0.98);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    align-items: stretch;
    padding: 24px 20px;
    gap: 16px;
    display: none;
    box-shadow: var(--shadow-lg);
    z-index: 999;
  }

  .main-nav.mobile-open {
    display: flex;
  }

  .nav-link {
    font-size: 1.05rem;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .nav-cta-group {
    flex-direction: column;
    margin-top: 8px;
  }

  .nav-cta-group .btn {
    width: 100%;
  }

  .canvas-wrapper-card {
    padding: 12px;
  }

  .canvas-toolbar-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .canvas-guides-group {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .canvas-actions-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .export-actions-group {
    flex-direction: column;
    width: 100%;
  }

  .export-actions-group .btn {
    width: 100%;
  }

  .studio-tabs-nav {
    grid-template-columns: repeat(4, 1fr);
  }

  .studio-tab-btn {
    padding: 10px 4px;
    font-size: 0.7rem;
  }

  .stickers-palette {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

  .yt-feed-grid {
    grid-template-columns: 1fr;
  }

  .modal-window {
    max-height: 95vh;
  }

  .modal-body {
    padding: 14px;
  }
}

/* Touch Device Target Adjustments */
@media (pointer: coarse) {
  .btn, .tool-toggle-btn, .studio-tab-btn, .preset-card-mini, .sticker-select-btn {
    min-height: 44px;
  }

  .input-range {
    height: 24px;
  }
}