/* ============================================================
   RESPONSIVE.CSS - Mobile & Tablet Breakpoints
   ============================================================ */

/* ========== TABLET (768px and down) ========== */
@media (max-width: 768px) {
  /* Typography */
  h1 { font-size: 28px; }
  h2 { font-size: 20px; }
  h3 { font-size: 16px; }

  /* Layout */
  .shell {
    padding: 0 8px;
  }

  #app-content {
    padding: var(--spacing-md) 0;
  }

  /* Header */
  header {
    gap: 8px;
    padding: 12px 0;
    flex-direction: column;
    align-items: stretch;
  }

  .logo {
    order: 1;
  }

  nav {
    order: 2;
    flex-basis: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  nav::-webkit-scrollbar {
    display: none;
  }

  nav a, nav button {
    font-size: 12px;
    padding: 6px 12px;
    flex-shrink: 0;
  }

  .header-actions {
    order: 3;
    gap: 8px;
  }

  /* Navigation */
  nav {
    gap: 4px;
  }

  /* Grid */
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  }

  /* Cards */
  .card {
    padding: 12px;
  }

  /* Stats */
  .stat-card {
    padding: 12px;
  }

  .stat-value {
    font-size: 24px;
  }

  /* Page layout */
  .page-header {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .page-header h1 {
    margin-bottom: 0;
  }

  .page-actions {
    gap: 4px;
  }

  .page-actions .btn {
    flex: 1 1 auto; /* basis auto: buttons wrap instead of overflowing */
  }

  /* Content wrapper */
  .content-wrapper {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .sidebar {
    width: 100%;
  }

  /* Buttons */
  .btn {
    font-size: 12px;
    padding: 6px 12px;
  }

  .btn.large {
    padding: 10px 20px;
    font-size: 13px;
  }

  /* Modals/Dialogs */
  .modal {
    max-width: calc(100% - 20px);
  }

  /* Connection badge */
  #conn-badge {
    font-size: 10px;
    padding: 3px 8px;
    order: 4;
    align-self: flex-end;
  }

  .dot {
    width: 5px;
    height: 5px;
  }

  /* Tables */
  table {
    font-size: 12px;
  }

  th, td {
    padding: 6px 8px;
  }

  /* Forms */
  input, textarea, select {
    font-size: 16px; /* Prevents zoom on iOS */
  }

  /* List items */
  .list-item {
    padding: 8px 12px;
    gap: 8px;
  }

  .list-item-icon {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  /* Utilities */
  .gap-sm { gap: 4px; }
  .gap-md { gap: 8px; }
  .gap-lg { gap: 12px; }

  .p-sm { padding: 4px; }
  .p-md { padding: 8px; }
  .p-lg { padding: 12px; }

  .m-sm { margin: 4px; }
  .m-md { margin: 8px; }
  .m-lg { margin: 12px; }
}

/* ========== MOBILE (480px and down) ========== */
@media (max-width: 480px) {
  /* Spacing */
  :root {
    --spacing-md: 12px;
    --spacing-lg: 16px;
  }

  /* Typography */
  h1 { font-size: 24px; margin-bottom: 12px; }
  h2 { font-size: 18px; margin-bottom: 8px; }
  h3 { font-size: 14px; margin-bottom: 6px; }

  p {
    font-size: 14px;
  }

  /* Layout */
  .shell {
    padding: 0 4px;
  }

  #app-content {
    padding: 8px 0;
  }

  /* Header */
  header {
    gap: 4px;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
  }

  .logo {
    font-size: 16px;
  }

  .logo-icon {
    font-size: 20px;
  }

  nav {
    gap: 2px;
  }

  nav a, nav button {
    font-size: 11px;
    padding: 4px 8px;
  }

  /* Grid */
  .grid-2, .grid-3, .grid-4, .grid-auto {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  /* Cards */
  .card {
    padding: 8px;
    border-radius: var(--radius-md);
  }

  .card-header {
    gap: 4px;
    margin-bottom: 8px;
  }

  .card-title {
    font-size: 14px;
  }

  /* Stats */
  .stat-card {
    padding: 8px;
  }

  .stat-label {
    font-size: 10px;
  }

  .stat-value {
    font-size: 20px;
  }

  .stat-delta {
    font-size: 10px;
  }

  /* Buttons */
  .btn {
    font-size: 11px;
    padding: 4px 8px;
    gap: 4px;
  }

  .btn.small {
    padding: 2px 6px;
    font-size: 10px;
  }

  .btn.large {
    padding: 8px 16px;
    font-size: 12px;
  }

  .btn.icon-only {
    padding: 6px;
    width: 32px;
    height: 32px;
  }

  /* Page header */
  .page-header {
    margin-bottom: 8px;
    gap: 4px;
  }

  .page-header h1 {
    font-size: 20px;
    margin: 0;
  }

  .page-actions {
    gap: 2px;
    flex-wrap: wrap;
  }

  .page-actions .btn {
    flex: 1 1 auto; /* basis auto: buttons wrap instead of overflowing */
    min-width: 60px;
  }

  /* Badges */
  .badge {
    font-size: 9px;
    padding: 2px 8px;
  }

  /* Forms */
  input, textarea, select {
    font-size: 16px;
    padding: 8px 8px;
  }

  textarea {
    min-height: 80px;
  }

  /* List items */
  .list-item {
    padding: 6px 8px;
    gap: 6px;
  }

  .list-item-icon {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  .list-item-title {
    font-size: 13px;
  }

  .list-item-subtitle {
    font-size: 11px;
  }

  /* Tables */
  table {
    font-size: 11px;
  }

  thead {
    display: none;
  }

  tr {
    display: block;
    margin-bottom: 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
  }

  td {
    display: block;
    padding: 6px 8px;
    border: none;
    border-bottom: 1px solid var(--border);
    text-align: left;
  }

  td:last-child {
    border-bottom: none;
  }

  td::before {
    content: attr(data-label);
    font-weight: 600;
    display: inline-block;
    width: 100px;
    color: var(--accent);
  }

  /* Toggle switches */
  .toggle-pill {
    width: 40px;
    height: 22px;
  }

  .toggle-pill::after {
    width: 16px;
    height: 16px;
  }

  .toggle-pill.on::after {
    left: 20px;
  }

  /* Connection badge */
  #conn-badge {
    font-size: 9px;
    padding: 2px 6px;
  }

  .dot {
    width: 4px;
    height: 4px;
  }

  /* Footer */
  footer {
    padding: var(--spacing-md) 0;
    font-size: 11px;
  }

  /* Utilities */
  .gap-sm { gap: 2px; }
  .gap-md { gap: 4px; }
  .gap-lg { gap: 8px; }

  .p-sm { padding: 2px; }
  .p-md { padding: 4px; }
  .p-lg { padding: 8px; }

  .m-sm { margin: 2px; }
  .m-md { margin: 4px; }
  .m-lg { margin: 8px; }

  /* Hide on mobile */
  .hide-mobile {
    display: none;
  }

  /* Show only on mobile */
  .show-mobile {
    display: block;
  }

  /* Center content on mobile */
  .text-center-mobile {
    text-align: center;
  }
}

/* ========== LARGE SCREENS (1400px and up) ========== */
@media (min-width: 1400px) {
  .shell {
    max-width: 1600px;
  }

  .grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

/* ========== LANDSCAPE MODE ========== */
@media (max-height: 600px) and (orientation: landscape) {
  header {
    padding: 8px 0;
  }

  nav a, nav button {
    padding: 4px 10px;
    font-size: 12px;
  }

  .page-header {
    margin-bottom: 8px;
  }

  .page-header h1 {
    font-size: 20px;
  }

  #app-content {
    padding: 8px 0;
  }
}

/* ========== PORTRAIT MODE ========== */
@media (max-width: 600px) and (orientation: portrait) {
  /* Optimize for portrait */
  .grid-4, .grid-3, .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* ========== PRINT STYLES ========== */
@media print {
  header, footer, nav, .no-print {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  a {
    color: #0066cc;
    text-decoration: underline;
  }

  .card {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}

/* ========== HIDING/SHOWING BY SCREEN SIZE ========== */
.hide-mobile { display: block; }
.show-mobile { display: none; }
.hide-tablet { display: block; }
.show-tablet { display: none; }

@media (max-width: 768px) {
  .hide-tablet { display: none; }
  .show-tablet { display: block; }
}

@media (max-width: 480px) {
  .hide-mobile { display: none; }
  .show-mobile { display: block; }
}

/* ========== ACCESSIBILITY ========== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

@media (prefers-color-scheme: dark) {
  body {
    color-scheme: dark;
  }
}

@media (prefers-color-scheme: light) {
  body {
    color-scheme: light;
  }
}