@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");

    :root {
      --primary: #6366f1;
      --primary-dark: #4f46e5;
      --primary-light: #dbeafe;
      --primary-glow: 0 3px 20px 0 rgba(99, 102, 241, 0.15);
      --glass-bg: rgba(255,255,255,0.8);
      --glass-border: rgba(203, 213, 225, 0.3);
      --text-main: #111827;
      --text-subtle: #6b7280;
      --overlay-border: #94a3b8;
      --background: #f9fafb;
      --background-accent: #f3f4f6;
      --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
      --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
      --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      background: var(--background);
      color: var(--text-main);
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      line-height: 1.5;
      transition: background .4s, color .3s;
    }
    
    h1, h2, h3, .font-bold, .font-semibold {

      color: var(--text-main);
      font-weight: 700;
    }
header {
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:1rem 2rem;
  border-bottom:1px solid #e5e7eb;
}

main {
  display:flex;
  gap:2rem;
  justify-content:center;
  align-items:flex-start;
  max-width:1300px;
  margin:0 auto;
  padding:1.5rem;
}
main>section:first-child {
  flex:1;
  min-width:380px;
}

h1 {
  font-size:2.2rem;
  letter-spacing:-0.02em;
}


    
    /* Glass morphism effects */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px) saturate(180%);
      border-radius: 1rem;
      border: 1px solid var(--glass-border);
      box-shadow: var(--shadow-md);
    }
    
    /* Drop zones - keeping original class name */
    .drop-area {
      border: 2px dashed var(--overlay-border);
      border-radius: 0.75rem;
      min-height: 76px;
      background: var(--background-accent);
      text-align: center;
      color: var(--text-subtle);
      cursor: pointer;
      font-weight: 500;
      transition: all 0.2s ease;
    }
    
    .drop-area.hover, .drop-area:focus, .drop-area:active {
      border-color: var(--primary);
      background: var(--primary-light);
      color: var(--primary-dark);
    }
    
    input[type="file"] {
      display: none;
    }
    
    /* Keeping btn-glass for compatibility */
    .btn-glass {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(8px);
      border-radius: 9999px;
      padding: .55rem 1.15rem;
      font-weight: 500;
      color: var(--text-main);
      border: 1px solid var(--glass-border);
      font-size: 1rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
      cursor: pointer;
      outline: none;
      user-select: none;
      line-height: 1.1;
    }
    
    .btn-glass:hover, .btn-glass:focus {
      background: rgba(255, 255, 255, 0.2);
      border-color: var(--primary);
      color: var(--primary-dark);
      transform: translateY(-1px);
      box-shadow: var(--shadow-md);
    }

    .btn-active {
      background: rgba(255, 255, 255, 0.3);
      border-color: var(--primary);
      color: var(--primary-dark);
      box-shadow: var(--shadow-md);
    }

    .dark .btn-active {
      background: rgba(255, 255, 255, 0.15);
    }
    
    /* Keep original btn-primary class */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: 9999px;
      padding: .55rem 1.45rem;
      font-size: 1.1rem;
      font-weight: 600;
      border: none;
      box-shadow: var(--primary-glow);
      outline: none;
      cursor: pointer;
      display: flex; 
      align-items: center; 
      justify-content: center;
      gap: .5rem;
      transition: background-color 0.4s ease, box-shadow 0.2s ease, transform 0.2s ease;
    }
    
    .btn-primary:hover, .btn-primary:focus {
      background: var(--primary-dark);
      box-shadow: 0 6px 24px 0 rgba(16, 185, 129, 0.2);
      transform: translateY(-1px);
    }
    
    /* Overlay image */
    .overlay-img {
      position: absolute;
      top: 0; 
      left: 0;
      width: 100%; 
      height: 100%;
      pointer-events: none;
      transition: opacity 0.2s ease;
      opacity: 1;
      z-index: 10;
    }
    
    /* Form controls */
    input[type=range] {
      width: 100%;
      accent-color: var(--primary);
      height: 4px;
      margin-top: 6px;
      margin-bottom: 12px;
      background: transparent;
    }
    
    label {
      font-size: 0.95rem;
      color: var(--text-main);
      font-weight: 500;
      display: block;
      margin-bottom: 4px;
    }
    
    input[type="checkbox"] {
      accent-color: var(--primary);
      transform: scale(1.1);
      margin-right: 6px;
    }
    
    /* Canvas styling */
    #canvas {
      background: white;
      border-radius: 1rem;
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-md);
      transition: all 0.2s ease;
      display: block;
      width: 100%;
      height: 100%;
      image-rendering: auto;
    }
    
    #preview {
      border-radius: 0.75rem;
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
      margin: 0 auto;
      background: #fafbfc;
      max-width: 100%;
    }
    
    /* Button Grid Layout */
    .btn-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0.5rem;
      margin-bottom: 1.2em;
    }
    
    .btn-grid button {
      width: 100%;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    
    .btn-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 0.5rem;
      margin-bottom: 1.2em;
    }
    
    /* Canvas container that will be fullscreened */
    .canvas-container {
      position: relative;
      width: 100%;
      max-width: 520px;
      margin: 0 auto 1.6em;
    }
    
    /* Fullscreen overlay adjustments */
    .canvas-container:fullscreen {
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--background);
      width: 100%;
      height: 100%;
      padding: 0;
      margin: 0;
    }
    
    .canvas-container:fullscreen .canvas-wrapper {
      position: relative;
      width: auto;
      height: auto;
      max-height: 95vh;
      max-width: 95vw;
    }
    
    .canvas-container:fullscreen #canvas {
      width: 100%;
      height: 100%;
      object-fit: contain;
      max-height: 95vh;
    }
    
    .canvas-container:fullscreen #fullscreen-btn {
      position: absolute;
      bottom: 20px;
      right: 20px;
      z-index: 100;
      opacity: 0.7;
    }
    
    .canvas-container:fullscreen #fullscreen-btn:hover {
      opacity: 1;
    }

    /* Fullscreen control overlay */
    .fs-controls {
      position: absolute;
      top: 20px;
      right: 20px;
      display: none;
      gap: 0.5em;
      opacity: 0;
      transition: opacity 0.3s;
      z-index: 101;
    }

    .fs-controls button {
      padding: 0.4em 0.7em;
    }

    .canvas-container.fs-active {
      animation: fs-fade-in 0.4s ease-out forwards;
    }

    .canvas-container.fs-active .fs-controls {
      display: flex;
      opacity: 1;
    }

    .canvas-container.fs-active #fullscreen-btn {
      display: none;
    }

    /* Position & scale controls overlay in fullscreen */
    #control-panel.fs-overlay {
      position: absolute;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      max-width: 420px;
      width: 90%;
      max-height: 80vh;
      overflow-y: auto;
      display: none;
      z-index: 102;
    }

    .canvas-container.fs-show-controls #control-panel.fs-overlay {
      display: block;
    }

    .canvas-container.fs-moving-controls #control-panel.fs-overlay {
      cursor: move;
    }
    
    /* Vendor prefixes for fullscreen */
    .canvas-container:-webkit-full-screen {
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--background);
      width: 100%;
      height: 100%;
      padding: 0;
      margin: 0;
    }
    
    .canvas-container:-moz-full-screen {
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--background);
      width: 100%;
      height: 100%;
      padding: 0;
      margin: 0;
    }
    
    .canvas-container:-ms-fullscreen {
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--background);
      width: 100%;
      height: 100%;
      padding: 0;
      margin: 0;
    }
    
    /* Toast notification for auto-fit */
    .toast {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      background-color: rgba(15, 23, 42, 0.9);
      color: white;
      padding: 10px 20px;
      border-radius: 8px;
      font-size: 14px;
      z-index: 1000;
      opacity: 0;
      transition: opacity 0.3s;
      box-shadow: var(--shadow-md);
    }
    
    .toast.show {
      opacity: 1;
    }
    
    /* Dark Mode */
    .dark {
      --background: #0f172a;
      --background-accent: #1e293b;
      --text-main: #e2e8f0;
      --text-subtle: #94a3b8;
      --overlay-border: #334155;
    }
    
    .dark body, .dark .glass-card {
      background: var(--background);
      color: var(--text-main);
    }
    
    .dark h1, .dark h2, .dark h3, .dark .font-bold, .dark .font-semibold, 
    .dark label, .dark span, .dark p, .dark li {
      color: var(--text-main);
    }
    
    .dark .drop-area {
      background: rgba(30, 41, 59, 0.5);
      border-color: var(--overlay-border);
      color: var(--text-subtle);
    }
    
    .dark .drop-area.hover, .dark .drop-area:focus, .dark .drop-area:active {
      border-color: var(--primary);
      background: rgba(16, 185, 129, 0.2);
      color: var(--primary-light);
    }
    
    .dark .btn-glass {
      background: rgba(30, 41, 59, 0.5);
      color: var(--text-main);
      border-color: rgba(71, 85, 105, 0.3);
    }
    
    .dark .btn-glass:hover, .dark .btn-glass:focus {
      color: var(--primary-light);
      border-color: var(--primary);
      background: rgba(16, 185, 129, 0.15);
    }
    
    .dark .btn-primary {
      box-shadow: 0 4px 16px 0 rgba(16, 185, 129, 0.2);
      color: white;
    }
    
    .dark input[type=range] {
      accent-color: var(--primary);
      background: transparent;
    }
    
    .dark #canvas {
      background: #1e293b;
      border: 1px solid #334155;
      box-shadow: 0 6px 24px rgba(16, 185, 129, 0.1);
    }
    
    .dark #preview {
      background: #1e293b;
      border: 1px solid #334155;
    }
    
    .dark .canvas-container:fullscreen,
    .dark .canvas-container:-webkit-full-screen,
    .dark .canvas-container:-moz-full-screen,
    .dark .canvas-container:-ms-fullscreen {
      background: var(--background);
    }
    
    /* Responsive Design */
    @media (max-width: 768px) {
      main {
        flex-direction: column;
        padding: 1rem !important;
      }
      
      section {
        width: 100% !important;
        min-width: auto !important;
      }
      
      .glass-card {
        padding: 1.5rem !important;
      }
      
      header {
        padding: 1rem !important;
      }
      
      h1 {
        font-size: 1.8rem !important;
      }
    }

/* Page load and interaction animations */
@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fade-slide-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fs-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (prefers-reduced-motion: no-preference) {
  body {
    opacity: 0;
  }

  body.page-loaded {
    animation: fade-in 0.6s ease-out forwards;
  }

  body.page-loaded header,
  body.page-loaded main {
    animation: fade-slide-up 0.6s ease-out forwards;
  }

  .btn-glass:active,
  .btn-primary:active {
    transform: scale(0.97);
  }
}

/* Animated bubble buttons for downloads */
.btn-bubble {
  position: relative;
  overflow: hidden;
  color: white;
  transition: background-color 0.4s ease;
}

.btn-bubble:hover,
.btn-bubble:focus {
  animation: bubbles 1s forwards ease-out;
  /* background color comes from btn-primary, allow it to transition */
  background-repeat: no-repeat;
  background-image:
    radial-gradient(circle at center, transparent 30%, #eef 60%, #eef 65%, transparent 70%),
    radial-gradient(circle at center, transparent 30%, #eef 60%, #eef 65%, transparent 70%),
    radial-gradient(circle at center, transparent 30%, #eef 60%, #eef 65%, transparent 70%),
    radial-gradient(circle at center, transparent 30%, #eef 60%, #eef 65%, transparent 70%),
    radial-gradient(circle at center, transparent 30%, #eef 60%, #eef 65%, transparent 70%),
    radial-gradient(circle at center, transparent 30%, #eef 60%, #eef 65%, transparent 70%),
    radial-gradient(circle at center, transparent 30%, #eef 60%, #eef 65%, transparent 70%),
    radial-gradient(circle at center, transparent 30%, #eef 60%, #eef 65%, transparent 70%),
    radial-gradient(circle at center, transparent 30%, #eef 60%, #eef 65%, transparent 70%),
    radial-gradient(circle at center, transparent 30%, #eef 60%, #eef 65%, transparent 70%);
  background-size:
    0.99em 0.99em,
    1.15em 1.15em,
    0.95em 0.95em,
    0.86em 0.86em,
    0.82em 0.82em,
    0.89em 0.89em,
    0.62em 0.62em,
    0.76em 0.76em,
    1.16em 1.16em,
    0.61em 0.61em;
  background-position:
    87% 133%,
    52% 131%,
    64% 107%,
    7% 92%,
    106% 148%,
    2% 89%,
    35% 135%,
    60% 141%,
    23% 87%,
    82% 131%;
}

@keyframes bubbles {
  100% {
    background-position:
      78% -268%,
      51% -156%,
      70% -329%,
      16% 9%,
      115% -325%,
      2% -159%,
      35% -88%,
      64% 43%,
      30% -393%,
      92% -400%;
    box-shadow: inset 0 -6.5em 0 #0072c4;
  }
}

/* Loading screen styles */
#loading-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background);
  z-index: 10000;
  transition: opacity 0.6s ease;
}

#loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

#loading-screen .loader-bar {
  width: 80%;
  height: 6px;
  background: var(--background-accent);
  border-radius: 3px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

#loading-screen .loader-progress {
  height: 100%;
  width: 0;
  background: var(--primary);
  transition: width 0.2s linear;
}

#loading-screen .progress-text {
  margin-top: 1rem;
  font-weight: 500;
  color: var(--text-main);
  text-align: center;
}

/* Footer styling */
.site-footer {
  font-size: 0.85em;
  color: var(--text-subtle);
  text-align: center;
  margin-top: 2em;
  padding-bottom: 1em;
}