:root{
    --bg:#0e0f12;
    --fg:#e9eef3;
    --muted:#9aa3ad;
    --accent:#58d0ff;
    --accent-2:#8aff8a;
    --panel:#151820;
    --panel-2:#1a1f2a;
    --ring: rgba(88,208,255,.5);
    --shadow: 0 10px 30px rgba(0,0,0,.35);
    
    /* Responsive spacing variables */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    
    /* Touch target sizes */
    --touch-target: 48px;
    --button-padding-mobile: 12px 16px;
    --button-padding-desktop: 8px 12px;
  }

  html, body {
    margin:0; padding:0; height:100%;
    background: radial-gradient(1200px 700px at 10% 0%, #141822 0%, #0d1016 60%, #0b0d12 100%);
    color: var(--fg);
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  }

  /* Canvas fills the window */
  #stage {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    display:block;
    cursor: crosshair;
  }

  /* Top control bar */
  .chrome {
    position: fixed; inset: var(--spacing-lg) var(--spacing-lg) auto var(--spacing-lg);
    display:flex; gap:var(--spacing-sm); align-items:center;
    background: linear-gradient(180deg, rgba(21,25,34,.9), rgba(21,25,34,.75));
    border: 1px solid #2a3342;
    border-radius: 14px;
    padding: var(--spacing-sm) var(--spacing-md);
    box-shadow: var(--shadow);
    backdrop-filter: blur(6px);
    z-index: 10;
    user-select: none;
    transition: all 0.3s ease;
  }

  /* Control grouping */
  .primary-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
  }
  
  .secondary-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
  }

  .hamburger-toggle {
    display: none; /* Hidden on desktop */
    background: var(--accent);
    color: #000;
    font-size: 16px;
    font-weight: bold;
    min-width: 36px;
    padding: 6px;
    align-items: center;
    justify-content: center;
  }
  
  .hamburger-icon {
    display: inline-block;
    transition: transform 0.3s ease;
  }

  /* Ensure hamburger button is hidden on desktop and tablet */
  @media (min-width: 768px) {
    .hamburger-toggle {
      display: none !important;
    }
    
    /* Reset any collapsed state on larger screens */
    .chrome.collapsed {
      flex-direction: row;
      align-items: center;
      padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .chrome.collapsed .secondary-controls,
    .chrome.collapsed .hint,
    .chrome.collapsed .spacer {
      display: flex;
    }
  }

  /* Mobile-first responsive design */
  @media (max-width: 767px) {
    .chrome {
      inset: var(--spacing-sm) var(--spacing-sm) auto var(--spacing-sm);
      flex-direction: column;
      align-items: stretch;
      gap: var(--spacing-sm);
      padding: var(--spacing-md);
    }
    
    .primary-controls {
      flex-direction: row;
      justify-content: space-between;
      align-items: center;
    }
    
    .secondary-controls {
      flex-direction: column;
      gap: var(--spacing-sm);
    }
    
    .hamburger-toggle {
      display: flex; /* Show on mobile */
    }
    
    .chrome.collapsed {
      flex-direction: row;
      align-items: center;
      padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .chrome.collapsed .primary-controls {
      flex: 1;
    }
    
    .chrome.collapsed .secondary-controls,
    .chrome.collapsed .hint,
    .chrome.collapsed .spacer {
      display: none;
    }
    
    .chrome.collapsed .hamburger-icon {
      transform: rotate(90deg);
    }
    
    /* Secondary controls dropdown animation */
    .secondary-controls {
      max-height: 500px;
      overflow: hidden;
      transition: max-height 0.3s ease, opacity 0.3s ease;
    }
    
    .chrome.collapsed .secondary-controls {
      max-height: 0;
      opacity: 0;
    }
  }

  /* Landscape mode adaptation for mobile devices */
  @media (max-width: 767px) and (orientation: landscape) {
    .chrome {
      flex-direction: row;
      align-items: center;
      gap: var(--spacing-md);
      padding: var(--spacing-sm) var(--spacing-md);
      inset: var(--spacing-sm) var(--spacing-sm) auto var(--spacing-sm);
    }
    
    .primary-controls {
      flex-direction: row;
      gap: var(--spacing-sm);
      align-items: center;
    }
    
    .secondary-controls {
      flex-direction: row;
      gap: var(--spacing-sm);
      flex-wrap: wrap;
    }
    
    /* In landscape, always show secondary controls but make them compact */
    .chrome.collapsed .secondary-controls {
      display: flex;
      flex-direction: row;
      gap: var(--spacing-xs);
    }
    
    /* Make buttons slightly smaller in landscape to fit better */
    .btn, .select {
      padding: 8px 12px;
      font-size: 12px;
    }
  }

  /* Tablet landscape optimization */
  @media (min-width: 768px) and (max-width: 1024px) and (orientation: landscape) {
    .chrome {
      flex-direction: row;
      gap: var(--spacing-lg);
    }
    
    .secondary-controls {
      flex-direction: row;
      gap: var(--spacing-md);
      flex-wrap: wrap;
    }
  }

  /* Mobile Camera Button Styles */
  .mobile-camera {
    background: var(--panel-2) !important;
    border: 1px solid #2b3443 !important;
    color: var(--fg) !important;
    display: none; /* Hidden by default, shown via JS on mobile with camera */
    align-items: center;
    gap: 4px;
  }

  /* Mobile footer for address bar hiding */
  .mobile-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: transparent;
    pointer-events: none;
    z-index: 1;
    display: none;
  }
  
  /* Show footer on mobile devices to enable scroll */
  @media (max-width: 767px) {
    body {
      padding-bottom: 60px; /* Add space to enable scroll */
    }
    
    .mobile-footer {
      display: block;
    }
  }
  
  /* Also enable on mobile landscape (short height, reasonable width) */
  @media (max-height: 500px) and (max-width: 1024px) {
    body {
      padding-bottom: 60px; /* Add space to enable scroll */
    }
    
    .mobile-footer {
      display: block;
    }
  }

  .chrome h1 {
    font-size: 14px; margin:0 8px 0 2px; letter-spacing:.4px; color:#dfe7ee; font-weight:600;
  }

  .spacer { flex: 1; }

  .btn, .select {
    appearance: none;
    background: var(--panel-2);
    color: var(--fg);
    border: 1px solid #2b3443;
    padding: var(--button-padding-desktop);
    border-radius: 12px;
    font-size: 13px;
    line-height: 1;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.02);
    min-height: 40px; /* Minimum for desktop */
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
  }
  
  .btn:hover, .select:hover { 
    border-color:#3a475d; 
    background: #1e2534;
  }
  
  .btn:active { 
    transform: translateY(1px); 
    background: #141a26;
  }

  /* Touch-friendly sizing for mobile */
  @media (max-width: 767px) {
    .btn, .select {
      padding: var(--button-padding-mobile);
      min-height: var(--touch-target);
      font-size: 14px;
      width: 100%;
      box-sizing: border-box;
    }
    
    /* Remove hover effects on touch devices */
    .btn:hover, .select:hover {
      border-color: #2b3443;
      background: var(--panel-2);
    }
    
    /* Enhanced touch feedback */
    .btn:active, .select:active {
      transform: scale(0.98);
      background: #141a26;
    }
  }

  .btn.primary {
    background: linear-gradient(180deg, #1d2736, #182233);
    border-color: #334259;
  }
  .btn.glow {
    box-shadow: 0 0 0 2px var(--ring);
  }

  label.file {
    position: relative; overflow: hidden; cursor: pointer; display:inline-flex; align-items:center; gap:8px;
  }
  label.file input { position:absolute; inset:0; opacity:0; cursor:pointer; }

  /* Mobile file input styling */
  @media (max-width: 767px) {
    label.file {
      width: 100%;
      justify-content: center;
    }
  }

  .hint {
    font-size:12px; color: var(--muted);
    padding: 2px 8px;
    border-left: 1px solid #2a3342;
    margin-left: 6px;
  }

  /* Tablet adjustments */
  @media (min-width: 768px) and (max-width: 1024px) {
    .chrome {
      inset: var(--spacing-md) var(--spacing-md) auto var(--spacing-md);
      flex-wrap: wrap;
    }
    
    .btn, .select {
      min-height: 42px;
      padding: 10px 14px;
    }
    
    .hint {
      font-size: 11px;
      flex-basis: 100%;
      margin-left: 0;
      border-left: none;
      border-top: 1px solid #2a3342;
      margin-top: var(--spacing-sm);
      padding-top: var(--spacing-sm);
    }
  }

  /* Hide hints on mobile devices */
  @media (max-width: 767px) {
    .hint {
      display: none;
    }
  }

  /* Bottom palette panel */
  .palette {
    position: fixed; inset: auto var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
    display:flex; gap:var(--spacing-sm); align-items:stretch;
    background: linear-gradient(180deg, rgba(21,25,34,.88), rgba(21,25,34,.72));
    border: 1px solid #2a3342;
    border-radius: 14px;
    padding: var(--spacing-sm);
    box-shadow: var(--shadow);
    backdrop-filter: blur(6px);
    z-index: 9;
    min-height: 64px;
  }

  /* Mobile palette adjustments */
  @media (max-width: 767px) {
    .palette {
      inset: auto var(--spacing-sm) var(--spacing-sm) var(--spacing-sm);
      gap: var(--spacing-xs);
      padding: var(--spacing-xs);
      min-height: 56px;
      overflow-x: auto;
      scrollbar-width: none; /* Firefox */
      -ms-overflow-style: none; /* Internet Explorer 10+ */
    }
    
    .palette::-webkit-scrollbar { 
      display: none; /* WebKit */
    }
  }
  .swatch {
    position: relative; width: 56px; border-radius: 10px; overflow: hidden; border:1px solid rgba(255,255,255,.08);
  }
  .swatch span {
    position:absolute; bottom:6px; left:6px; right:6px;
    font-size:11px; text-shadow: 0 1px 2px rgba(0,0,0,.6);
  }

  /* Drop / Paste overlay */
  .overlay {
    position: fixed; inset:0; display:none;
    align-items:center; justify-content:center; flex-direction:column;
    background: radial-gradient(600px 300px at 50% 40%, rgba(88,208,255,.10), rgba(0,0,0,.6));
    border: 2px dashed rgba(88,208,255,.35);
    pointer-events:none;
    z-index: 100;
  }
  .overlay.show { display:flex; animation: pulse 1.2s infinite ease-in-out; }
  .overlay .big {
    font-size: 28px; font-weight:700; letter-spacing:.5px; color:#e9f6ff;
    text-shadow: 0 8px 24px rgba(88,208,255,.35);
    margin-bottom:8px;
  }
  .overlay .small { color:#b9d8e6; font-size:14px; }

  @keyframes pulse {
    0% { box-shadow: inset 0 0 0 0 rgba(88,208,255,.25); }
    50% { box-shadow: inset 0 0 0 8px rgba(88,208,255,.15); }
    100% { box-shadow: inset 0 0 0 0 rgba(88,208,255,.25); }
  }

  /* Toast */
  .toast {
    position: fixed; left: 50%; transform: translateX(-50%);
    bottom: 96px; padding: 10px 14px; border-radius: 12px; font-size: 13px;
    background: #10151e; color:#e8f2ff; border:1px solid #2b3443; box-shadow: var(--shadow);
    opacity: 0; pointer-events:none; transition: opacity .25s ease;
    z-index: 20;
  }
  .toast.show { opacity: 1; }

  /* Help */
  .kbd {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 12px;
    background:#0b0f15; border:1px solid #2a3342; padding:2px 6px; border-radius:6px; color:#cfe7ff;
  }



  /* Hide file input when JS disabled fallback shows text */
  noscript { position: fixed; top:0; left:0; right:0; background:#b00020; color:white; padding:8px; text-align:center; z-index:999; }