/**
 * Multi Tube Views (MTV) — Responsive Design & Mobile Optimization System
 * 
 * Mobile-First Responsive Overrides for <=768px (Mobile & Small Tablets)
 * and <=360px (Extra Small Phones: iPhone SE 1st Gen, Galaxy Fold).
 * 
 * STRICT ARCHITECTURAL RULE:
 * Desktop (>=993px) and Tablet (769px-992px) styles remain 100% UNTOUCHED.
 */

/* ==========================================================================
   Mobile Menu Button & Drawer Navigation (Default: Desktop Hidden)
   ========================================================================== */
.btn-mobile-menu {
  display: none;
  width: 36px;
  height: 36px;
  min-width: 36px;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  touch-action: manipulation;
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, transform var(--transition-speed) ease;
  flex-shrink: 0;
  padding: 0;
  -webkit-user-select: none;
  user-select: none;
}

.btn-mobile-menu:hover,
.btn-mobile-menu:focus-visible {
  background-color: var(--bg-subtle);
  border-color: var(--text-primary);
}

.btn-mobile-menu:active {
  transform: scale(0.94);
}

/* Mobile Drawer Overlay */
.mobile-drawer {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  height: calc(100dvh - var(--header-height));
  max-height: calc(100dvh - var(--header-height));
  background-color: rgba(253, 253, 253, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  padding: 0.4rem 0.5rem 1.25rem 0.5rem;
  gap: 0.2rem;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
  overscroll-behavior: contain;
  transform: translateX(-100%);
  visibility: hidden;
  pointer-events: none;
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.22s;
  border-top: 1px solid var(--border-subtle);
}

[data-theme="dark"] .mobile-drawer {
  background-color: rgba(10, 10, 12, 0.98);
}

.mobile-drawer.open {
  transform: translateX(0);
  visibility: visible;
  pointer-events: auto;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.65rem;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  touch-action: manipulation;
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, color var(--transition-speed) ease;
  min-height: 30px;
  text-decoration: none;
}

.mobile-nav-link:hover,
.mobile-nav-link:active {
  background-color: var(--bg-subtle);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.mobile-nav-link.active {
  color: var(--accent-blue);
  background-color: var(--accent-subtle);
  border-color: var(--accent-border);
}

/* ==========================================================================
   Breakpoints: Tablets & Small Laptops (769px to 992px)
   ========================================================================== */
@media (max-width: 992px) and (min-width: 769px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .player-grid[data-cols="4"],
  .player-grid[data-cols="3"] {
    grid-template-columns: repeat(2, 1fr);
  }

  .platform-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.85rem;
  }
}

/* ==========================================================================
   Breakpoints: Mobile Devices & Phablets (<= 768px)
   ULTRA-COMPACT, CLEAN, DENSE & STREAMLINED MOBILE SYSTEM
   ========================================================================== */
@media (max-width: 768px) {
  :root {
    --header-height: 38px;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 10px;
  }

  /* Global Container & Mobile Canvas */
  html, body {
    overflow-x: hidden !important;
    width: 100% !important;
    max-width: 100% !important;
    -webkit-text-size-adjust: 100%;
  }

  .container {
    padding-left: 0.5rem !important;
    padding-right: 0.5rem !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }

  .site-main {
    padding-bottom: 0.85rem !important;
    overflow-x: hidden !important;
  }

  /* Neutralizing Desktop Inline Spacing on Mobile */
  [style*="padding-top: 2rem"],
  [style*="padding-top: 3rem"],
  [style*="padding-top: 4rem"],
  [style*="padding-top: 3.5rem"] {
    padding-top: 0.25rem !important;
  }

  [style*="margin-bottom: 2rem"],
  [style*="margin-bottom: 2.5rem"],
  [style*="margin-bottom: 3rem"],
  [style*="margin-bottom: 3.5rem"] {
    margin-bottom: 0.4rem !important;
  }

  [style*="gap: 1.5rem"],
  [style*="gap: 2rem"] {
    gap: 0.35rem !important;
  }

  [style*="font-size: 1.15rem"],
  [style*="font-size: 1.1rem"],
  [style*="font-size: 1.25rem"] {
    font-size: 0.72rem !important;
    line-height: 1.35 !important;
  }

  /* 1. Header & Navigation (Ultra Compact) */
  .site-header {
    height: 38px !important;
  }

  .header-inner {
    padding: 0 !important;
    height: 38px !important;
  }

  .brand {
    gap: 0.25rem !important;
    font-size: 0.76rem !important;
  }

  .brand-icon {
    width: 20px !important;
    height: 20px !important;
    min-width: 20px !important;
    min-height: 20px !important;
    font-size: 0.55rem !important;
    border-radius: 4px !important;
  }

  .brand-text span:first-child {
    font-size: 0.76rem !important;
    white-space: nowrap !important;
  }

  .brand-badge {
    font-size: 0.46rem !important;
    padding: 0.02rem 0.18rem !important;
    border-radius: 2px !important;
  }

  .nav-desktop {
    display: none !important;
  }

  .btn-mobile-menu {
    display: flex !important;
    width: 26px !important;
    height: 26px !important;
    min-width: 26px !important;
    min-height: 26px !important;
    border-radius: 4px !important;
    padding: 0 !important;
  }

  .btn-mobile-menu svg {
    width: 14px !important;
    height: 14px !important;
  }

  .btn-icon-only {
    width: 26px !important;
    height: 26px !important;
    min-width: 26px !important;
    min-height: 26px !important;
    border-radius: 4px !important;
    padding: 0 !important;
  }

  .btn-icon-only svg {
    width: 14px !important;
    height: 14px !important;
  }

  .header-actions {
    gap: 0.2rem !important;
  }

  /* 2. Base Typography on Mobile */
  h1, .tool-title, .hero-title, .contact-title {
    font-size: 0.95rem !important;
    line-height: 1.15 !important;
    letter-spacing: -0.01em !important;
    word-break: break-word !important;
    overflow-wrap: anywhere !important;
    margin-bottom: 0.15rem !important;
  }

  h2 {
    font-size: 0.86rem !important;
    line-height: 1.2 !important;
    letter-spacing: -0.01em !important;
    word-break: break-word !important;
    margin: 0.45rem 0 0.15rem 0 !important;
  }

  h3 {
    font-size: 0.76rem !important;
    line-height: 1.22 !important;
    word-break: break-word !important;
    margin: 0.35rem 0 0.12rem 0 !important;
  }

  h4 {
    font-size: 0.65rem !important;
    letter-spacing: 0.04em !important;
    margin-bottom: 0.12rem !important;
  }

  p {
    font-size: 0.72rem !important;
    line-height: 1.32 !important;
    margin-bottom: 0.3rem !important;
    word-break: break-word !important;
    overflow-wrap: anywhere !important;
  }

  /* 3. Compact Breadcrumbs */
  .breadcrumb-nav {
    margin: 0.15rem 0 0.25rem 0 !important;
    font-size: 0.62rem !important;
    flex-wrap: wrap !important;
    gap: 0.15rem !important;
    line-height: 1.2 !important;
  }

  .breadcrumb-separator {
    font-size: 0.6rem !important;
  }

  /* 4. Compact Platform Workspace Header */
  .tool-header {
    display: flex !important;
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.25rem !important;
    padding: 0.2rem 0 0.3rem 0 !important;
    margin-bottom: 0.35rem !important;
    border-bottom: 1px solid var(--border-subtle) !important;
  }

  .tool-identity {
    display: flex !important;
    align-items: flex-start !important;
    gap: 0.35rem !important;
    width: 100% !important;
  }

  .tool-avatar {
    width: 22px !important;
    height: 22px !important;
    min-width: 22px !important;
    min-height: 22px !important;
    font-size: 0.75rem !important;
    border-radius: 4px !important;
    flex-shrink: 0 !important;
    margin-top: 1px !important;
  }

  .tool-identity > div {
    min-width: 0 !important;
    flex: 1 !important;
  }

  .tool-title-row {
    display: flex !important;
    align-items: center !important;
    flex-wrap: wrap !important;
    gap: 0.15rem 0.3rem !important;
    margin-bottom: 0.05rem !important;
  }

  .tool-title {
    font-size: 0.88rem !important;
    line-height: 1.15 !important;
    font-weight: 700 !important;
    margin: 0 !important;
  }

  .embed-badge {
    font-size: 0.5rem !important;
    padding: 0.02rem 0.25rem !important;
    border-radius: 3px !important;
    line-height: 1.2 !important;
  }

  .tool-desc {
    font-size: 0.65rem !important;
    line-height: 1.26 !important;
    color: var(--text-secondary) !important;
    margin: 0.05rem 0 0.12rem 0 !important;
  }

  .platform-support-chips {
    display: flex !important;
    align-items: center !important;
    flex-wrap: wrap !important;
    gap: 0.12rem !important;
    margin-top: 0.08rem !important;
  }

  .support-tag {
    font-size: 0.52rem !important;
    padding: 0.02rem 0.2rem !important;
    border-radius: 2px !important;
    line-height: 1.2 !important;
  }

  .tool-header .btn {
    width: 100% !important;
    height: 22px !important;
    min-height: 22px !important;
    justify-content: center !important;
    font-size: 0.62rem !important;
    padding: 0.08rem 0.35rem !important;
    border-radius: 4px !important;
    margin-top: 0.05rem !important;
  }

  /* 5. Compact Platform Support Info Box */
  .platform-support-infobox {
    padding: 0.35rem 0.45rem !important;
    margin-bottom: 0.4rem !important;
    border-radius: 6px !important;
    gap: 0.25rem !important;
  }

  .platform-support-infobox-header {
    gap: 0.25rem !important;
  }

  .platform-support-infobox-title {
    font-size: 0.58rem !important;
  }

  .platform-support-grid {
    grid-template-columns: 1fr !important;
    gap: 0.25rem !important;
  }

  .platform-support-item {
    font-size: 0.65rem !important;
    gap: 0.25rem !important;
  }

  /* 6. Compact Workspace Tool Panel */
  .tool-panel {
    padding: 0.35rem 0.4rem !important;
    border-radius: 6px !important;
    margin-bottom: 0.4rem !important;
    border: 1px solid var(--border-strong) !important;
    box-shadow: none !important;
  }

  .input-section {
    margin-bottom: 0.3rem !important;
  }

  .input-group-label {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    font-size: 0.65rem !important;
    font-weight: 600 !important;
    margin-bottom: 0.15rem !important;
  }

  .input-hint {
    font-size: 0.55rem !important;
    color: var(--text-muted) !important;
  }

  /* Single Input Row: Full width input + 3 compact action buttons in ONE row */
  .single-input-row {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 0.2rem !important;
    width: 100% !important;
  }

  .single-input-row .url-input-field {
    grid-column: 1 / -1 !important;
    width: 100% !important;
    height: 28px !important;
    min-height: 28px !important;
    font-size: 0.72rem !important;
    padding: 0.15rem 0.4rem !important;
    border-radius: 4px !important;
    border: 1px solid var(--border-strong) !important;
    box-sizing: border-box !important;
  }

  .single-input-row .btn {
    width: 100% !important;
    height: 24px !important;
    min-height: 24px !important;
    font-size: 0.62rem !important;
    padding: 0.08rem 0.15rem !important;
    justify-content: center !important;
    white-space: nowrap !important;
    text-align: center !important;
    border-radius: 4px !important;
    gap: 0.15rem !important;
  }

  .batch-textarea {
    font-size: 0.72rem !important;
    min-height: 55px !important;
    padding: 0.25rem 0.4rem !important;
    width: 100% !important;
    border-radius: 4px !important;
    box-sizing: border-box !important;
  }

  #batch-input-tab .btn {
    width: 100% !important;
    height: 26px !important;
    min-height: 26px !important;
    justify-content: center !important;
    font-size: 0.68rem !important;
  }

  /* 7. Settings Toolbar on Mobile: Compact 2-Column Responsive Grid */
  .settings-toolbar {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 0.25rem 0.35rem !important;
    padding: 0.3rem 0.35rem !important;
    border-radius: 6px !important;
    margin-bottom: 0.35rem !important;
    border: 1px solid var(--border-subtle) !important;
    background-color: var(--bg-subtle) !important;
  }

  .settings-toolbar > .setting-item:last-child:nth-child(odd) {
    grid-column: 1 / -1 !important;
  }

  .setting-item {
    display: flex !important;
    flex-direction: column !important;
    gap: 0.05rem !important;
    min-width: 0 !important;
  }

  .setting-label {
    font-size: 0.52rem !important;
    font-weight: 700 !important;
    letter-spacing: 0.03em !important;
    text-transform: uppercase !important;
    line-height: 1 !important;
    margin-bottom: 0.04rem !important;
    color: var(--text-muted) !important;
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
  }

  .setting-select {
    height: 26px !important;
    min-height: 26px !important;
    font-size: 0.68rem !important;
    font-weight: 500 !important;
    padding: 0.1rem 0.25rem !important;
    border-radius: 4px !important;
    border: 1px solid var(--border-strong) !important;
    width: 100% !important;
    box-sizing: border-box !important;
    background-color: var(--bg-surface) !important;
    color: var(--text-primary) !important;
    line-height: 1.1 !important;
  }

  /* 8. Action Buttons Row: Compact Generate Button + Reload All / Clear on ONE Row */
  .tool-actions-row {
    display: flex !important;
    flex-direction: column !important;
    width: 100% !important;
    gap: 0.25rem !important;
  }

  #btn-generate-players {
    width: 100% !important;
    height: 28px !important;
    min-height: 28px !important;
    font-size: 0.72rem !important;
    font-weight: 700 !important;
    justify-content: center !important;
    padding: 0.15rem 0.5rem !important;
    border-radius: var(--radius-full) !important;
    gap: 0.3rem !important;
  }

  #btn-generate-players svg {
    width: 12px !important;
    height: 12px !important;
  }

  .tool-secondary-actions {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    width: 100% !important;
    gap: 0.25rem !important;
  }

  .tool-secondary-actions .btn {
    width: 100% !important;
    height: 24px !important;
    min-height: 24px !important;
    font-size: 0.62rem !important;
    justify-content: center !important;
    padding: 0.1rem 0.25rem !important;
    border-radius: 4px !important;
    gap: 0.2rem !important;
    white-space: nowrap !important;
  }

  .tool-secondary-actions .btn svg {
    width: 11px !important;
    height: 11px !important;
  }

  /* 9. Player Canvas Stage & Grid */
  .player-grid-section {
    margin-top: 0.35rem !important;
  }

  .stage-empty-card {
    padding: 0.65rem 0.45rem !important;
    border-radius: 6px !important;
    border: 1px dashed var(--border-strong) !important;
  }

  .stage-empty-icon {
    font-size: 1rem !important;
    margin-bottom: 0.15rem !important;
  }

  .stage-empty-card h3 {
    font-size: 0.76rem !important;
    margin-bottom: 0.08rem !important;
  }

  .stage-empty-card p {
    font-size: 0.65rem !important;
    line-height: 1.26 !important;
    max-width: 100% !important;
  }

  .player-grid {
    grid-template-columns: 1fr !important;
    gap: 0.4rem !important;
    width: 100% !important;
  }

  .player-card {
    border-radius: 6px !important;
    overflow: hidden !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }

  .player-card-bar {
    padding: 0.15rem 0.3rem !important;
    font-size: 0.58rem !important;
    gap: 0.15rem !important;
    min-height: 24px !important;
  }

  .player-bar-left {
    gap: 0.15rem !important;
    font-size: 0.58rem !important;
  }

  .player-badge-num {
    width: 13px !important;
    height: 13px !important;
    font-size: 0.5rem !important;
    border-radius: 3px !important;
  }

  .player-slot-title {
    font-size: 0.58rem !important;
  }

  .player-platform-badge {
    font-size: 0.5rem !important;
    padding: 0.02rem 0.16rem !important;
    border-radius: 2px !important;
  }

  .slot-status-tag {
    font-size: 0.48rem !important;
    padding: 0.02rem 0.15rem !important;
    border-radius: 2px !important;
  }

  .player-bar-actions {
    gap: 0.12rem !important;
  }

  .btn-slot-action {
    width: 20px !important;
    height: 20px !important;
    min-width: 20px !important;
    min-height: 20px !important;
    font-size: 0.52rem !important;
    border-radius: 3px !important;
  }

  .slot-ratio-select {
    height: 20px !important;
    font-size: 0.52rem !important;
    padding: 0 0.12rem !important;
    border-radius: 3px !important;
  }

  .player-card-footer-edit {
    padding: 0.12rem 0.3rem !important;
    font-size: 0.58rem !important;
    gap: 0.2rem !important;
  }

  .slot-url-display {
    font-size: 0.58rem !important;
  }

  .btn-slot-edit-trigger {
    font-size: 0.55rem !important;
  }

  .slot-inline-edit-input {
    font-size: 0.68rem !important;
    min-height: 24px !important;
    padding: 0.1rem 0.25rem !important;
    border-radius: 3px !important;
  }

  /* Responsive Player Frame Containment */
  .player-frame-wrapper {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }

  .player-frame-wrapper[data-ratio="16-9"],
  .player-frame-wrapper.ratio-16-9,
  .player-frame-wrapper[data-ratio="auto"].ratio-video,
  .player-frame-wrapper.ratio-video {
    width: 100% !important;
    aspect-ratio: 16 / 9 !important;
  }

  .player-frame-wrapper[data-ratio="4-3"],
  .player-frame-wrapper.ratio-4-3 {
    width: 100% !important;
    aspect-ratio: 4 / 3 !important;
  }

  .player-frame-wrapper[data-ratio="1-1"],
  .player-frame-wrapper.ratio-1-1,
  .player-frame-wrapper[data-ratio="auto"].ratio-square,
  .player-frame-wrapper.ratio-square {
    width: 100% !important;
    max-width: 100% !important;
    aspect-ratio: 1 / 1 !important;
    margin: 0 auto !important;
  }

  .player-frame-wrapper[data-ratio="9-16"],
  .player-frame-wrapper.ratio-9-16,
  .player-frame-wrapper[data-ratio="auto"].ratio-vertical,
  .player-frame-wrapper.ratio-vertical {
    width: 100% !important;
    max-width: 100% !important;
    aspect-ratio: 9 / 16 !important;
    max-height: 60vh !important;
    margin: 0 auto !important;
  }

  .player-frame-wrapper[data-ratio="auto"].ratio-social-post {
    width: 100% !important;
    max-width: 100% !important;
    min-height: 280px !important;
    height: 320px !important;
    margin: 0 auto !important;
  }

  .player-frame-wrapper[data-ratio="auto"].ratio-audio-spotify,
  .player-frame-wrapper[data-ratio="auto"].ratio-audio-soundcloud {
    width: 100% !important;
    height: 120px !important;
    min-height: 120px !important;
  }

  .player-loading-overlay {
    gap: 0.35rem !important;
  }

  .player-spinner {
    width: 20px !important;
    height: 20px !important;
  }

  .player-loading-text {
    font-size: 0.65rem !important;
  }

  .fallback-player-card {
    padding: 0.6rem 0.45rem !important;
    gap: 0.25rem !important;
    min-height: 120px !important;
  }

  .fallback-icon {
    font-size: 1rem !important;
  }

  .fallback-title {
    font-size: 0.72rem !important;
  }

  .fallback-desc {
    font-size: 0.65rem !important;
    line-height: 1.25 !important;
    max-width: 100% !important;
  }

  .fallback-player-card .btn {
    width: 100% !important;
    height: 24px !important;
    min-height: 24px !important;
    justify-content: center !important;
    font-size: 0.62rem !important;
  }

  /* 10. Info Callouts & Status Bars */
  .info-callout {
    padding: 0.35rem 0.45rem !important;
    gap: 0.25rem !important;
    margin: 0.35rem 0 !important;
    border-radius: 6px !important;
  }

  .info-callout-icon {
    font-size: 0.75rem !important;
  }

  .info-callout-content p {
    font-size: 0.65rem !important;
    line-height: 1.26 !important;
  }

  .status-summary-bar {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.2rem !important;
    padding: 0.25rem 0.35rem !important;
    margin-bottom: 0.35rem !important;
    border-radius: 6px !important;
  }

  .summary-stats {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 0.15rem 0.25rem !important;
    font-size: 0.58rem !important;
    width: 100% !important;
  }

  .stat-pill {
    font-size: 0.54rem !important;
    white-space: nowrap !important;
  }

  /* 11. Homepage Hero Section (Compact) */
  .hero-section {
    padding: 0.5rem 0 0.35rem 0 !important;
  }

  .hero-pill {
    font-size: 0.52rem !important;
    padding: 0.08rem 0.35rem !important;
    margin-bottom: 0.2rem !important;
    letter-spacing: 0.04em !important;
  }

  .hero-title {
    font-size: 1.05rem !important;
    line-height: 1.18 !important;
    margin-bottom: 0.15rem !important;
  }

  .hero-description {
    font-size: 0.72rem !important;
    line-height: 1.3 !important;
    margin-bottom: 0.45rem !important;
    padding: 0 !important;
  }

  .hero-actions {
    flex-direction: column !important;
    width: 100% !important;
    gap: 0.25rem !important;
  }

  .hero-actions .btn {
    width: 100% !important;
    height: 28px !important;
    min-height: 28px !important;
    justify-content: center !important;
    font-size: 0.72rem !important;
    padding: 0.15rem 0.5rem !important;
    border-radius: var(--radius-full) !important;
  }

  /* 12. Homepage Directory Grid (Compact) */
  #directory {
    padding-top: 0.15rem !important;
    margin-bottom: 0.75rem !important;
  }

  .directory-header {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.25rem !important;
    margin-bottom: 0.35rem !important;
  }

  .directory-header h2 {
    font-size: 0.95rem !important;
    margin-bottom: 0.05rem !important;
  }

  .directory-header p {
    font-size: 0.66rem !important;
  }

  .search-input-wrap {
    max-width: 100% !important;
    width: 100% !important;
  }

  .search-input {
    font-size: 0.72rem !important;
    padding: 0.15rem 0.5rem 0.15rem 1.6rem !important;
    height: 28px !important;
    min-height: 28px !important;
    border-radius: var(--radius-full) !important;
  }

  .search-icon {
    left: 0.5rem !important;
    width: 11px !important;
    height: 11px !important;
  }

  .platform-grid {
    grid-template-columns: 1fr !important;
    gap: 0.35rem !important;
    margin-bottom: 0.75rem !important;
  }

  .platform-card {
    padding: 0.45rem 0.5rem !important;
    border-radius: 6px !important;
  }

  .platform-card-header {
    gap: 0.35rem !important;
    margin-bottom: 0.15rem !important;
  }

  .platform-avatar {
    width: 22px !important;
    height: 22px !important;
    min-width: 22px !important;
    min-height: 22px !important;
    font-size: 0.72rem !important;
    border-radius: 4px !important;
  }

  .platform-card-title {
    font-size: 0.76rem !important;
  }

  .platform-card-desc {
    font-size: 0.66rem !important;
    line-height: 1.25 !important;
    margin-bottom: 0.2rem !important;
  }

  .platform-support-section {
    margin-top: 0.15rem !important;
    margin-bottom: 0.25rem !important;
  }

  .support-tags-list {
    gap: 0.15rem !important;
  }

  .platform-card-footer {
    padding-top: 0.2rem !important;
  }

  .platform-open-label {
    font-size: 0.56rem !important;
    letter-spacing: 0.04em !important;
  }

  /* 13. Articles, Settings, About, Contact & Static Pages */
  .article-grid {
    grid-template-columns: 1fr !important;
    gap: 0.35rem !important;
    margin: 0.35rem 0 !important;
  }

  .article-card {
    padding: 0.45rem 0.5rem !important;
    border-radius: 6px !important;
  }

  .article-tag {
    font-size: 0.52rem !important;
    margin-bottom: 0.15rem !important;
  }

  .article-card h3 {
    font-size: 0.76rem !important;
    margin-bottom: 0.12rem !important;
  }

  .article-card p {
    font-size: 0.66rem !important;
    line-height: 1.26 !important;
    margin-bottom: 0.3rem !important;
  }

  .article-card .btn {
    height: 24px !important;
    min-height: 24px !important;
    font-size: 0.62rem !important;
    padding: 0.1rem 0.4rem !important;
  }

  .reading-content {
    padding: 0.2rem 0 0.75rem 0 !important;
    max-width: 100% !important;
  }

  .reading-content h1,
  .container > h1 {
    font-size: 0.95rem !important;
    line-height: 1.15 !important;
    margin-bottom: 0.25rem !important;
  }

  .reading-content h2,
  .card h2 {
    font-size: 0.86rem !important;
    line-height: 1.2 !important;
    margin: 0.55rem 0 0.2rem 0 !important;
  }

  .reading-content h3,
  .card h3 {
    font-size: 0.74rem !important;
    line-height: 1.22 !important;
    margin: 0.4rem 0 0.15rem 0 !important;
  }

  .reading-content p,
  .reading-content ul,
  .reading-content ol,
  .reading-content > p:first-of-type,
  .container > p:first-of-type {
    font-size: 0.72rem !important;
    line-height: 1.35 !important;
    margin-bottom: 0.35rem !important;
  }

  .reading-content ul,
  .reading-content ol {
    margin: 0.15rem 0 0.35rem 0.65rem !important;
  }

  .reading-content li {
    margin-bottom: 0.1rem !important;
  }

  /* Contact Page */
  .contact-page-header {
    margin-bottom: 0.35rem !important;
  }

  .contact-title {
    margin-bottom: 0.12rem !important;
  }

  .contact-subtitle {
    font-size: 0.68rem !important;
    line-height: 1.28 !important;
    margin-bottom: 0 !important;
  }

  .contact-card {
    padding: 0.45rem 0.5rem !important;
    border-radius: 6px !important;
  }

  .contact-form {
    gap: 0.35rem !important;
  }

  .form-group {
    gap: 0.08rem !important;
  }

  .form-label {
    font-size: 0.65rem !important;
  }

  .form-label-hint {
    font-size: 0.55rem !important;
  }

  .form-control {
    font-size: 0.72rem !important;
    padding: 0.15rem 0.4rem !important;
    height: 28px !important;
    min-height: 28px !important;
    border-radius: 4px !important;
  }

  textarea.form-control {
    min-height: 55px !important;
    height: 55px !important;
  }

  .contact-submit-btn {
    font-size: 0.72rem !important;
    height: 28px !important;
    min-height: 28px !important;
    padding: 0.15rem 0.6rem !important;
    border-radius: var(--radius-full) !important;
  }

  .contact-inline-alert {
    padding: 0.25rem 0.4rem !important;
    font-size: 0.65rem !important;
  }

  /* Settings Page */
  .settings-container,
  .container[style*="max-width: 800px"] {
    padding-top: 0.25rem !important;
  }

  .card {
    padding: 0.45rem 0.5rem !important;
    border-radius: 6px !important;
    margin-bottom: 0.35rem !important;
  }

  .card h2 {
    font-size: 0.86rem !important;
    margin-bottom: 0.35rem !important;
  }

  .setting-select-full,
  .card .setting-select,
  .settings-container .setting-select {
    width: 100% !important;
    max-width: 100% !important;
    font-size: 0.68rem !important;
    height: 26px !important;
    min-height: 26px !important;
  }

  .settings-actions {
    flex-direction: column !important;
    width: 100% !important;
    gap: 0.25rem !important;
  }

  .settings-actions .btn {
    width: 100% !important;
    height: 28px !important;
    min-height: 28px !important;
  }

  /* Creator Profile Card (About & Credits) */
  .creator-profile-card {
    margin-top: 0.6rem !important;
    padding: 0.45rem 0.5rem !important;
    border-radius: 6px !important;
    gap: 0.2rem !important;
  }

  .creator-profile-badge {
    width: 20px !important;
    height: 20px !important;
    font-size: 0.62rem !important;
  }

  .creator-profile-title {
    font-size: 0.78rem !important;
  }

  .creator-profile-desc {
    font-size: 0.66rem !important;
    line-height: 1.28 !important;
  }

  /* 14. Global Footer on Mobile */
  .site-footer {
    padding: 0.75rem 0 0.5rem 0 !important;
  }

  .footer-grid {
    grid-template-columns: 1fr !important;
    gap: 0.55rem !important;
    margin-bottom: 0.55rem !important;
  }

  .footer-brand h3 {
    font-size: 0.76rem !important;
    margin-bottom: 0.12rem !important;
  }

  .footer-brand p {
    font-size: 0.65rem !important;
    line-height: 1.25 !important;
  }

  .footer-col h4 {
    margin-bottom: 0.15rem !important;
    font-size: 0.58rem !important;
  }

  .footer-links {
    gap: 0.15rem !important;
  }

  .footer-links a {
    font-size: 0.65rem !important;
    padding: 0.02rem 0 !important;
  }

  .footer-bottom {
    flex-direction: column !important;
    gap: 0.25rem !important;
    text-align: center !important;
    padding-top: 0.4rem !important;
  }

  .footer-bottom-info {
    align-items: center !important;
    gap: 0.08rem !important;
    font-size: 0.6rem !important;
  }

  .creator-credit {
    justify-content: center !important;
    font-size: 0.58rem !important;
    flex-wrap: wrap !important;
  }

  .footer-bottom-links {
    flex-wrap: wrap !important;
    justify-content: center !important;
    gap: 0.25rem 0.5rem !important;
  }

  .footer-bottom-links a {
    font-size: 0.6rem !important;
  }

  /* FAQ Accordion */
  .faq-list {
    gap: 0.25rem !important;
    margin: 0.4rem 0 !important;
  }

  .faq-question {
    padding: 0.35rem 0.45rem !important;
    font-size: 0.7rem !important;
    gap: 0.25rem !important;
  }

  .faq-answer {
    padding: 0 0.45rem 0.35rem 0.45rem !important;
    font-size: 0.65rem !important;
    line-height: 1.28 !important;
  }

  /* Toast Notification */
  .toast-container {
    bottom: 0.35rem !important;
    left: 0.35rem !important;
    right: 0.35rem !important;
    max-width: calc(100% - 0.7rem) !important;
  }

  .toast {
    max-width: 100% !important;
    width: 100% !important;
    padding: 0.25rem 0.45rem !important;
    font-size: 0.65rem !important;
    border-radius: 4px !important;
  }
}

/* ==========================================================================
   Breakpoints: Extra Small Phones (<= 360px: iPhone SE 1st Gen, Galaxy Fold)
   ========================================================================== */
@media (max-width: 360px) {
  :root {
    --header-height: 36px;
  }

  .container {
    padding-left: 0.35rem !important;
    padding-right: 0.35rem !important;
  }

  .brand-text span:first-child {
    font-size: 0.7rem !important;
  }

  .brand-badge {
    display: none !important;
  }

  .brand-icon {
    width: 18px !important;
    height: 18px !important;
    font-size: 0.5rem !important;
  }

  .btn-mobile-menu,
  .btn-icon-only {
    width: 24px !important;
    height: 24px !important;
    min-width: 24px !important;
    min-height: 24px !important;
  }

  .btn-mobile-menu svg,
  .btn-icon-only svg {
    width: 13px !important;
    height: 13px !important;
  }

  h1, .hero-title, .tool-title {
    font-size: 0.82rem !important;
  }

  .single-input-row .btn {
    font-size: 0.58rem !important;
    padding: 0.05rem 0.1rem !important;
  }

  .settings-toolbar {
    grid-template-columns: 1fr !important;
    gap: 0.2rem !important;
  }

  .summary-stats {
    grid-template-columns: 1fr !important;
  }

  .tool-secondary-actions {
    grid-template-columns: 1fr 1fr !important;
  }

  .footer-bottom-links {
    flex-direction: column !important;
    align-items: center !important;
    gap: 0.15rem !important;
  }
}

/* ==========================================================================
   Reduced Motion Accessibility Support
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body[data-motion="reduced"] *,
body[data-motion="reduced"] *::before,
body[data-motion="reduced"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}

/* ==========================================================================
   Compact Display Mode Preference
   ========================================================================== */
body[data-density="compact"] .card,
body[data-density="compact"] .tool-panel {
  padding: 0.35rem !important;
}

body[data-density="compact"] .platform-card {
  padding: 0.35rem !important;
}

body[data-density="compact"] .player-card-bar {
  padding: 0.12rem 0.25rem !important;
}