:root {
    --bg-gradient-light: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-gradient-dark: linear-gradient(135deg, #1a1a1a 0%, #333333 100%);
    --text-color-light: #ffffff;
    --text-color-dark: #f1f1f1;
    --primary-color: #4CAF50;
    --secondary-color: #ff6f61;
    --border-color-light: rgba(255, 255, 255, 0.3);
    --border-color-dark: rgba(0, 0, 0, 0.3);
    --glow-color-light: rgba(255, 255, 255, 0.5);
    --glow-color-dark: rgba(0, 0, 0, 0.5);
  }

  body {
    font-family: 'Arial', sans-serif;
    background: var(--bg-gradient-light);
    color: var(--text-color-light);
    margin: 0;
    padding: 40px;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background 0.5s ease, color 0.5s ease;
  }

  body.dark-mode {
    background: var(--bg-gradient-dark);
    color: var(--text-color-dark);
  }

  h1 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 20px;
    text-shadow: 0 0 10px var(--glow-color-light);
  }

  .dark-mode h1 {
    text-shadow: 0 0 10px var(--glow-color-dark);
  }

  .container {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color-light);
    animation: fadeIn 1s ease-in-out;
  }

  .dark-mode .container {
    background: rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color-dark);
  }

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

  .upload-container {
    border: 2px dashed var(--border-color-light);
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
  }

  .dark-mode .upload-container {
    border-color: var(--border-color-dark);
  }

  .upload-container:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px var(--primary-color);
  }

  .upload-container.dragover {
    border-color: var(--secondary-color);
    box-shadow: 0 0 20px var(--secondary-color);
  }

  .upload-container input {
    display: none;
  }

  .upload-container p {
    margin: 0;
    font-size: 1.2rem;
    color: inherit;
  }

  .preview-image {
    max-width: 100%;
    height: auto;
    margin: 10px auto;
    border-radius: 15px;
    display: none;
    animation: zoomIn 0.5s ease-in-out;
  }

  @keyframes zoomIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
  }

  .controls {
    margin-top: 20px;
  }

  .control-group {
    margin-bottom: 20px;
  }

  .control-group label {
    display: block;
    margin-bottom: 10px;
    font-size: 1.1rem;
    font-weight: bold;
  }

  .slider {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 10px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 5px;
    outline: none;
    opacity: 0.7;
    transition: opacity 0.3s ease;
  }

  .dark-mode .slider {
    background: rgba(0, 0, 0, 0.2);
  }

  .slider:hover {
    opacity: 1;
  }

  .slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--glow-color-light);
  }

  .dark-mode .slider::-webkit-slider-thumb {
    box-shadow: 0 0 10px var(--glow-color-dark);
  }

  .slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--glow-color-light);
  }

  .dark-mode .slider::-moz-range-thumb {
    box-shadow: 0 0 10px var(--glow-color-dark);
  }

  .progress-bar {
    width: 100%;
    height: 10px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 5px;
    overflow: hidden;
    margin-top: 20px;
    display: none;
  }

  .dark-mode .progress-bar {
    background: rgba(0, 0, 0, 0.2);
  }

  .progress-bar-fill {
    height: 100%;
    background: var(--primary-color);
    width: 0;
    transition: width 0.3s ease;
  }

  .download-btn {
    background: var(--primary-color);
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    margin-top: 20px;
    width: 100%;
    font-size: 1.1rem;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 0 15px var(--primary-color);
  }

  .download-btn:hover {
    background: var(--secondary-color);
    box-shadow: 0 0 20px var(--secondary-color);
    transform: translateY(-2px);
  }

  .download-btn:disabled {
    background: rgba(255, 255, 255, 0.2);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
  }

  .dark-mode .download-btn:disabled {
    background: rgba(0, 0, 0, 0.2);
  }

  .theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 15px var(--primary-color);
    transition: all 0.3s ease;
    z-index: 999;
  }

  .theme-toggle:hover {
    background: var(--secondary-color);
    box-shadow: 0 0 20px var(--secondary-color);
    transform: rotate(180deg);
  }

  /* Custom Dropdown */
  .custom-select {
    position: relative;
    width: 100%;
  }

  .select-selected {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    padding: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .dark-mode .select-selected {
    background: rgba(0, 0, 0, 0.2);
  }

  .select-selected:hover {
    background: rgba(255, 255, 255, 0.3);
  }

  .dark-mode .select-selected:hover {
    background: rgba(0, 0, 0, 0.3);
  }

  .select-selected:after {
    content: '▼';
    font-size: 0.8rem;
    transition: transform 0.3s ease;
  }

  .select-selected.active:after {
    transform: rotate(180deg);
  }

  .select-items {
    position: absolute;
    background: #6f5ebce5; 
    border-radius: 10px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    z-index: 99;
    width: 100%;
    max-height: 200px;
    overflow-y: auto;
    margin-top: 5px;
  }

  .dark-mode .select-items {
    background: rgba(0, 0, 0, 0.9);
  }

  .select-items div {
    padding: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--bg-gradient-dark);
    color: var(--text-color-dark) !important;
  }

  .select-items div:hover {
    background: rgba(0, 0, 0, 0.1);
  }

  .dark-mode .select-items div:hover {
    background: rgba(255, 255, 255, 0.1);
  }

  .select-hide {
    display: none;
  }

  /* Image Resizer */
  .resizer {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
  }

  .resizer input {
    width: 100%;
    padding: 10px;
    border-radius: 10px;
    border: 1px solid var(--border-color-light);
    font-size: 1rem;
  }

  .dark-mode .resizer input {
    border-color: var(--border-color-dark);
    background: rgba(0, 0, 0, 0.2);
    color: var(--text-color-dark);
  }

  .resizer input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-color);
  }

  /* Mobile */
@media only screen and (max-width:767px) {
    body{
        padding: 10px;
    }    
    .container{
        width: 8009px;
    }
    h1{
        font-size: 30px;
    }
    .control-group label{
        font-size: 18px;
    }
    .download-btn{
        font-size: 22px;
    }
}