:root {
      --primary: #274c77;
      --primary-light: #274c77;
      --primary-dark: #3a56d4;
      --secondary: #6096ba;
      --accent: #4895ef;
      --light: #f8f9fa;
      --dark: #212529;
      --darker: #1a1a1a;
      --gray: #6c757d;
      --light-gray: #e9ecef;
      --lighter-gray: #f5f7ff;
      --success: #4bb543;
      --warning: #f0ad4e;
      --danger: #d9534f;
      --border-radius: 16px;
      --border-radius-sm: 8px;
      --box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
      --box-shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.08);
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
      --glass-bg: rgba(255, 255, 255, 0.92);
      --glass-border: rgba(255, 255, 255, 0.3);
    }

    /* Modern smooth scroll behavior */
    html {
      scroll-behavior: smooth;
      overflow-x: hidden;
    }

    /* Enhanced scrollbar with gradient */
    ::-webkit-scrollbar {
      width: 10px;
      height: 10px;
    }

    ::-webkit-scrollbar-track {
      background: var(--light-gray);
      border-radius: 10px;
    }

    ::-webkit-scrollbar-thumb {
      background: linear-gradient(to bottom, var(--primary), var(--accent));
      border-radius: 10px;
      border: 2px solid var(--light-gray);
    }

    ::-webkit-scrollbar-thumb:hover {
      background: linear-gradient(to bottom, var(--primary-dark), var(--accent));
    }

    /* Modern body styles with system font stack */
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: url('/theme/image/background.svg') no-repeat center center fixed;
    background-size: cover;
    background-color: #f0f3fb;
      line-height: 1.6;
      color: var(--dark);
      overflow-x: hidden;
      position: relative;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      padding-top:70px;
    }

    /* Fluid typography */
    h1 {
      font-size: clamp(1.5rem, 5vw, 2rem);
    }

    h2 {
      font-size: clamp(1.5rem, 4vw, 2rem);
    }

    h3 {
      font-size: clamp(1.5rem, 3.5vw, 2.2rem);
    }

    p,
    li,
    a {
      font-size: clamp(0.9rem, 3vw, 1rem);
    }

    /* Hero section with modern SVG background */
    .hero {
      text-align: center;
      padding: 10px;
      background: transparent;
      position: relative;
      overflow: hidden;
    }

    .hero h1 {
      margin-bottom: 20px;
      color: var(--dark);
      font-weight: 800;
      line-height: 1.2;
      font-size: 30px;
      position: relative;
      display: inline-block;
    }

    .hero h1::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background: linear-gradient(to right, var(--primary), var(--accent));
      border-radius: 2px;
    }

    .hero p {
      color: var(--gray);
      max-width: min(700px, 90%);
      margin: 0 auto;
      font-size: 20px;
    }

    /* Modern container with fluid max-width */
    .container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 5vw;
    }

    .main-content {
      padding: 40px 0;
    }

    /* Enhanced Modern card styles with backdrop-filter */
    .converter-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px) saturate(180%);
      -webkit-backdrop-filter: blur(20px) saturate(180%);
      border-radius: var(--border-radius);
      box-shadow: var(--box-shadow);
      padding: 40px;
      border: 1px solid var(--glass-border);
      transition: var(--transition);
      height: auto;
      display: flex;
      flex-direction: column;
      position: relative;
      overflow: hidden;
    }

    .converter-card::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: radial-gradient(circle, rgba(67, 97, 238, 0.1) 0%, rgba(67, 97, 238, 0) 70%);
      z-index: -1;
      transition: var(--transition);
      opacity: 0;
    }

    .card-title {
      font-size: 1.2rem;
      margin-bottom: 25px;
      color: var(--dark);
      display: flex;
      align-items: center;
      gap: 15px;
      font-weight: 700;
      position: relative;
    }

    .card-title i {
      color: var(--primary);
      font-size: 1.5rem;
    }

    /* Modern upload area with gradient border */
    .upload-area {
      border: 2px dashed var(--primary-light);
      border-radius: var(--border-radius);
      padding: 60px 20px;
      text-align: center;
      cursor: pointer;
      transition: var(--transition);
      margin-bottom: 30px;
      position: relative;
      background: rgba(67, 97, 238, 0.05);
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      overflow: hidden;
    }

    .upload-area::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: linear-gradient(135deg, rgba(67, 97, 238, 0.05) 0%, rgba(72, 149, 239, 0.05) 100%);
      z-index: -1;
    }

    .upload-area:hover {
      background: rgba(29, 68, 240, 0.14);
      border-color: var(--primary); 
    }

    .upload-area i {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 15px;
    }
    .upload-area p {
      margin-bottom: 10px;
      color: var(--gray);
      font-size: 1.1rem;
    }

    .upload-area .btn {
      margin-top: 15px;
    }

    #fileInput {
      display: none;
    }

    /* Enhanced button styles with gradient */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: white;
      padding: 14px 28px;
      border-radius: var(--border-radius);
      text-decoration: none;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      font-size: 1rem;
      box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
      position: relative;
      overflow: hidden;
      z-index: 1;
    }

    .btn::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, var(--primary-dark) 0%, var(--accent) 100%);
      opacity: 0;
      transition: var(--transition);
      z-index: -1;
    }

    .btn:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 20px rgba(67, 97, 238, 0.4);
    }

    .btn:hover::before {
      opacity: 1;
    }

    .btn:active {
      transform: translateY(0);
    }

    .btn i {
      font-size: 0.9em;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      box-shadow: none;
    }

    .btn-outline::before {
      background: var(--primary);
    }

    .btn-outline:hover {
      color: white;
    }

    .btn-secondary {
      background: linear-gradient(135deg, var(--secondary) 0%, #4a3fdb 100%);
      box-shadow: 0 4px 15px rgba(63, 55, 201, 0.3);
    }

    .btn-secondary:hover {
      background: linear-gradient(135deg, #3730a3 0%, #4a3fdb 100%);
    }

    .btn-danger {
      background: linear-gradient(135deg, var(--danger) 0%, #e63946 100%);
      box-shadow: 0 4px 15px rgba(217, 83, 79, 0.3);
    }

    .btn-danger:hover {
      background: linear-gradient(135deg, #c53030 0%, #e63946 100%);
    }

    /* Enhanced accordion for settings */
    .settings-accordion {
      margin-bottom: 25px;
      display: none; /* Initially hidden */
    }

    .accordion-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 25px;
      background: rgba(67, 97, 238, 0.1);
      border-radius: var(--border-radius-sm);
      cursor: pointer;
      transition: var(--transition);
      margin-bottom: 10px;
    }

    .accordion-header:hover {
      background: rgba(67, 97, 238, 0.15);
    }

    .accordion-header h3 {
      margin: 0;
      font-size: 1.2rem;
      color: var(--dark);
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 600;
    }

    .accordion-header i {
      transition: var(--transition);
      font-size: 0.9rem;
    }

    .accordion-header.active i {
      transform: rotate(180deg);
    }

    .accordion-content {
      padding: 0 25px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }

    .accordion-content.active {
      padding: 25px;
      max-height: 1000px;
      animation: fadeIn 0.3s ease-out;
    }

    @keyframes fadeIn {
      from {
        opacity: 0;
        transform: translateY(-10px);
      }

      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .settings-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
      gap: 20px;
    }

    /* Enhanced form controls */
    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: 500;
      color: var(--dark);
      font-size: 0.95rem;
    }

    .form-control {
      width: 100%;
      padding: 14px 18px;
      border: 1px solid var(--light-gray);
      border-radius: var(--border-radius-sm);
      font-family: inherit;
      transition: var(--transition);
      background: white;
      font-size: 0.95rem;
      box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
    }

    .select-control {
      appearance: none;
      background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
      background-repeat: no-repeat;
      background-position: right 12px center;
      background-size: 1em;
    }

    .range-container {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .range-value {
      min-width: 40px;
      text-align: center;
      font-weight: 500;
    }

    input[type="range"] {
      -webkit-appearance: none;
      width: 100%;
      height: 8px;
      border-radius: 4px;
      background: var(--light-gray);
      outline: none;
      box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    }

    input[type="range"]::-webkit-slider-thumb {
      -webkit-appearance: none;
      appearance: none;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: var(--primary);
      cursor: pointer;
      transition: var(--transition);
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    }

    input[type="range"]::-webkit-slider-thumb:hover {
      transform: scale(1.1);
      background: var(--primary-dark);
    }

    .checkbox-group {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .checkbox-group input {
      width: 18px;
      height: 18px;
      accent-color: var(--primary);
    }

    /* Enhanced toggle switch */
    .switch {
      position: relative;
      display: inline-block;
      width: 50px;
      height: 26px;
      margin-left: 10px;
    }

    .switch input {
      opacity: 0;
      width: 0;
      height: 0;
    }

    .slider {
      position: absolute;
      cursor: pointer;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-color: #ccc;
      transition: .4s;
      border-radius: 34px;
    }

    .slider:before {
      position: absolute;
      content: "";
      height: 18px;
      width: 18px;
      left: 4px;
      bottom: 4px;
      background-color: white;
      transition: .4s;
      border-radius: 50%;
    }

    input:checked+.slider {
      background-color: var(--primary);
    }

    input:checked+.slider:before {
      transform: translateX(24px);
    }

    /* Enhanced preview section */
    .preview-section {
      margin-top: 40px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      display: none; /* Initially hidden */
    }

    .preview-title {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
    }

    .preview-title h3 {
      font-size: 1.4rem;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .preview-actions {
      display: flex;
      gap: 10px;
    }

    /* Enhanced image preview */
    .image-preview-container {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
      gap: 20px;
      margin-bottom: 25px;
    }

    .image-preview-item {
      position: relative;
      border-radius: var(--border-radius-sm);
      overflow: hidden;
      box-shadow: var(--box-shadow-sm);
      transition: var(--transition);
      aspect-ratio: 1;
      background-color: var(--light-gray);
    }

    .image-preview-item:hover {
      transform: translateY(-5px);
      box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    }

    .image-preview-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .image-preview-actions {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(0, 0, 0, 0.7);
      padding: 8px;
      display: flex;
      justify-content: center;
      gap: 10px;
      transform: translateY(100%);
      transition: var(--transition);
    }

    .image-preview-item:hover .image-preview-actions {
      transform: translateY(0);
    }

    .image-preview-btn {
      background: none;
      border: none;
      color: white;
      cursor: pointer;
      font-size: 10px;
      transition: var(--transition);
    }

    .image-preview-btn:hover {
      color: var(--accent);
    }

    .pdf-preview-container {
      border: 1px solid var(--light-gray);
      border-radius: var(--border-radius);
      height: 500px;
      overflow-y: auto;
      background-color: #f9f9f9;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 20px;
    }

    .pdf-preview-container img {
      max-width: 100%;
      max-height: 100%;
      object-fit: contain;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    }

    .pdf-preview-placeholder {
      color: var(--gray);
    }

    .pdf-preview-placeholder i {
      font-size: 48px;
      margin-bottom: 15px;
      color: var(--light-gray);
    }

    .action-section {
      display: flex;
      justify-content: center;
      gap: 15px;
      margin-top: 30px;
      flex-wrap: wrap;
    }

    /* Enhanced progress bar */
    .progress-container {
      width: 100%;
      height: 10px;
      background-color: var(--light-gray);
      border-radius: 5px;
      margin: 30px 0;
      overflow: hidden;
      display: none;
      position: relative;
      box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    }

    .progress-bar {
      height: 100%;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      width: 0;
      transition: width 0.4s ease;
      border-radius: 5px;
      position: relative;
      overflow: hidden;
    }

    .progress-bar::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: linear-gradient(90deg,
          transparent,
          rgba(255, 255, 255, 0.5),
          transparent);
      animation: shimmer 1.5s infinite;
    }

    @keyframes shimmer {
      0% {
        transform: translateX(-100%);
      }

      100% {
        transform: translateX(100%);
      }
    }

    .progress-text {
      text-align: center;
      margin-top: 10px;
      font-size: 0.9rem;
      color: var(--gray);
    }

    /* Enhanced results section */
    .results-section {
      background: var(--glass-bg);
      backdrop-filter: blur(16px) saturate(180%);
      -webkit-backdrop-filter: blur(16px) saturate(180%);
      border-radius: var(--border-radius);
      box-shadow: var(--box-shadow);
      padding: 35px;
      margin-top: 40px;
      border: 1px solid var(--glass-border);
      animation: fadeIn 0.5s ease-out;
    }

    .results-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 25px;
    }

    .results-title {
      font-size: 1.5rem;
      color: var(--dark);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .results-info {
      display: flex;
      gap: 30px;
    }

    .result-item {
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .result-label {
      font-size: 0.9rem;
      color: var(--gray);
      margin-bottom: 5px;
    }

    .result-value {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--dark);
    }

    .compression-options {
      margin-top: 25px;
    }

    .compression-options h4 {
      margin-bottom: 15px;
      font-size: 1.1rem;
      color: var(--dark);
    }

    .compression-option {
      display: flex;
      align-items: center;
      padding: 15px;
      border-radius: var(--border-radius-sm);
      cursor: pointer;
      transition: var(--transition);
      margin-bottom: 10px;
      background: rgba(67, 97, 238, 0.05);
      border: 1px solid rgba(67, 97, 238, 0.1);
    }

    .compression-option:hover {
      background: rgba(67, 97, 238, 0.1);
      border-color: rgba(67, 97, 238, 0.2);
    }

    .compression-option input {
      margin-right: 15px;
      accent-color: var(--primary);
    }

    .compression-option-label {
      flex-grow: 1;
    }

    .compression-option strong {
      display: block;
      margin-bottom: 3px;
      font-weight: 600;
    }

    .compression-option-size {
      color: var(--gray);
      font-size: 0.9rem;
    }

    .features-section {
      padding: 20px 0;
      background-color: transparent;
    }

    .section-title {
      text-align: center;
      font-size: 2.2rem;
      margin-bottom: 50px;
      color: var(--dark);
      font-weight: 700;
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 30px;
    }

    .feature-card {
      background-color: transparent;
      border-radius: var(--border-radius);
      padding: 30px;
      box-shadow: var(--box-shadow);
      transition: var(--transition);
      border: 1px solid rgba(0, 0, 0, 0.05);
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    }

    .feature-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .feature-title {
      font-size: 1.3rem;
      margin-bottom: 15px;
      color: var(--dark);
      font-weight: 600;
    }

    .feature-desc {
      color: var(--gray);
      line-height: 1.7;
    }

    /* Tooltip */
    .tooltip {
      position: relative;
      display: inline-block;
      cursor: pointer;
    }

    .tooltip .tooltip-text {
      visibility: hidden;
      width: 200px;
      background-color: var(--dark);
      color: white;
      text-align: center;
      border-radius: var(--border-radius-sm);
      padding: 10px;
      position: absolute;
      z-index: 1;
      bottom: 125%;
      left: 50%;
      transform: translateX(-50%);
      opacity: 0;
      transition: opacity 0.3s;
      font-size: 0.9rem;
      font-weight: normal;
      box-shadow: var(--box-shadow-sm);
    }

    .tooltip:hover .tooltip-text {
      visibility: visible;
      opacity: 1;
    }

    /* Modern toast notification */
    .toast {
      position: fixed;
      bottom: 30px;
      right: 30px;
      background-color: var(--dark);
      color: white;
      padding: 16px 24px;
      border-radius: var(--border-radius);
      box-shadow: var(--box-shadow);
      display: flex;
      align-items: center;
      gap: 12px;
      transform: translateY(100px);
      opacity: 0;
      transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
      z-index: 1000;
      max-width: 350px;
    }

    .toast.show {
      transform: translateY(0);
      opacity: 1;
    }

    .toast.success {
      background: linear-gradient(135deg, var(--success) 0%, #3a9e36 100%);
    }

    .toast.error {
      background: linear-gradient(135deg, var(--danger) 0%, #c53030 100%);
    }

    .toast.warning {
      background: linear-gradient(135deg, var(--warning) 0%, #ec971f 100%);
    }

    .toast i {
      font-size: 1.2rem;
    }

    /* Loading spinner */
    .spinner {
      display: inline-block;
      width: 20px;
      height: 20px;
      border: 3px solid rgba(255, 255, 255, 0.3);
      border-radius: 50%;
      border-top-color: white;
      animation: spin 1s ease-in-out infinite;
    }

    @keyframes spin {
      to {
        transform: rotate(360deg);
      }
    }

    /* AdSense container */
    .ads-container {
      width: 100%;
      margin: 40px 0;
      display: flex;
      justify-content: center;
      background-color: var(--light-gray);
      padding: 20px;
      border-radius: var(--border-radius);
    }

    /* Floating action button */
    .floating-btn {
      position: fixed;
      bottom: 30px;
      right: 30px;
      width: 35px;
      height: 35px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--box-shadow);
      cursor: pointer;
      z-index: 99;
      transition: var(--transition);
      border: none;
    }

    .floating-btn:hover {
      transform: translateY(-5px) scale(1.05);
      box-shadow: 0 15px 30px rgba(67, 97, 238, 0.3);
    }

    .floating-btn i {
      font-size: 1.5rem;
    }

    /* Accessibility focus styles */
    :focus-visible {
      outline: 2px solid var(--primary);
      outline-offset: 3px;
      border-radius: 2px;
    }

    /* Skip to content link for screen readers */
    .skip-link {
      position: absolute;
      top: -40px;
      left: 0;
      background: var(--primary);
      color: white;
      padding: 8px;
      z-index: 100;
      transition: top 0.3s;
    }

    .skip-link:focus {
      top: 0;
    }

    /* Dark mode styles */
    body.dark-mode {
      background-color: var(--darker);
      color: #e0e0e0;
    }

    body.dark-mode .hero::before {
      opacity: 0.1;
    }

    body.dark-mode .hero h1 {
      color: #e0e0e0;
    }

    body.dark-mode .hero p {
      color: #a0a0a0;
    }

    body.dark-mode .converter-card,
    body.dark-mode .feature-card,
    body.dark-mode .results-section {
      background: rgba(30, 30, 30, 0.92);
      border-color: rgba(255, 255, 255, 0.15);
      color: #e0e0e0;
    }

    body.dark-mode .card-title,
    body.dark-mode .result-value,
    body.dark-mode .feature-title,
    body.dark-mode .result-label,
    body.dark-mode .preview-title h3,
    body.dark-mode .accordion-header h3,
    body.dark-mode .section-title {
      color: #e0e0e0;
    }

    body.dark-mode .form-control {
      background-color: #2d2d2d;
      border-color: #3d3d3d;
      color: #f0f0f0;
    }

    body.dark-mode .form-control:focus {
      box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.3);
    }

    body.dark-mode .upload-area {
      background: rgba(67, 97, 238, 0.1);
      border-color: var(--primary-dark);
    }

    body.dark-mode .accordion-header {
      background: rgba(67, 97, 238, 0.2);
    }

    body.dark-mode .accordion-header:hover {
      background: rgba(67, 97, 238, 0.25);
    }

    body.dark-mode .pdf-preview-container {
      background-color: #2a2a2a;
      border-color: #3a3a3a;
    }

    body.dark-mode .pdf-preview-placeholder {
      color: #a0a0a0;
    }

    body.dark-mode .progress-container {
      background-color: #3a3a3a;
    }

    body.dark-mode .features-section {
      background-color: #1a1a1a;
    }

    body.dark-mode .feature-desc {
      color: #a0a0a0;
    }

    body.dark-mode footer {
      background-color: #0a0a0a;
    }

    body.dark-mode .footer-column a {
      color: #8a8a8a;
    }

    body.dark-mode .compression-option {
      background: rgba(67, 97, 238, 0.1);
      border-color: rgba(67, 97, 238, 0.2);
    }

    body.dark-mode .compression-option:hover {
      background: rgba(67, 97, 238, 0.2);
      border-color: rgba(67, 97, 238, 0.3);
    }

    /* Responsive styles */
    @media (max-width: 1200px) {
      .container {
        max-width: 100%;
      }
    }

    @media (max-width: 992px) {
      .hero h1 {
        font-size: 2.4rem;
      }

      .hero p {
        font-size: 1.1rem;
      }

      .section-title {
        font-size: 2rem;
      }

      .converter-card {
        padding: 30px;
      }

      .features-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
      }
    }

    @media (max-width: 768px) {
      .hero {
        padding: 80px 0 50px;
      }

      .container {
        padding: 0 20px;
      }

      .tools-grid {
        gap: 20px;
      }

      .image-preview-container {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
      }

      .pdf-preview-container {
        height: 400px;
      }

      .action-section {
        flex-direction: column;
        align-items: center;
      }

      .action-section .btn {
        width: 100%;
        text-align: center;
      }

      .results-info {
        flex-direction: column;
        gap: 15px;
      }

      .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
      }
    }

    @media (max-width: 576px) {
      .hero {
        padding: 60px 0 40px;
      }

      .hero h1 {
        font-size: 1.8rem;
      }

      .card-title {
        font-size: 1.5rem;
      }

      .feature-card {
        padding: 25px;
      }

      .section-title {
        font-size: 1.8rem;
        margin-bottom: 40px;
      }

      .footer-content {
        grid-template-columns: 1fr;
        gap: 25px;
      }

      .upload-area {
        padding: 40px 20px;
      }

      .results-section {
        padding: 25px;
      }

      .toast {
        max-width: calc(100% - 40px);
        right: 20px;
        left: 20px;
      }
    }

    /* Performance optimizations */
    .will-change {
      will-change: transform, opacity;
    }

    /* Fluid spacing */
    .flow>*+* {
      margin-top: var(--flow-space, 1em);
    }

    /* New styles for the workflow */
    .workflow-step {
      display: none;
    }
    
    .workflow-step.active {
      display: block;
      animation: fadeIn 0.5s ease-out;
    }
    
    .converter-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
    }
    
    .converter-title {
      font-size: 1.8rem;
      color: var(--dark);
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 15px;
    }
    
    .step-indicator {
      display: flex;
      gap: 10px;
      align-items: center;
    }
    
    .step-dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background-color: var(--light-gray);
      transition: var(--transition);
    }
    
    .step-dot.active {
      background-color: var(--primary);
      transform: scale(1.2);
    }
    
    .step-dot.completed {
      background-color: var(--success);
    }
    
    /* Loading overlay */
    .loading-overlay {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-color: rgba(255, 255, 255, 0.9);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      z-index: 1000;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
    }
    
    .loading-overlay.active {
      opacity: 1;
      pointer-events: all;
    }
    
    .loading-spinner {
      width: 50px;
      height: 50px;
      border: 5px solid rgba(67, 97, 238, 0.2);
      border-radius: 50%;
      border-top-color: var(--primary);
      animation: spin 1s linear infinite;
      margin-bottom: 20px;
    }
    
    .loading-text {
      font-size: 1.2rem;
      color: var(--dark);
      font-weight: 500;
    }
    
    /* Dark mode adjustments for loading overlay */
    body.dark-mode .loading-overlay {
      background-color: rgba(30, 30, 30, 0.9);
    }
    
    body.dark-mode .loading-text {
      color: #e0e0e0;
    }
    
    
 .guide-section {
  padding: 20px 0;
  background-color: transparent;
}

.guide-content {
  max-width: 900px;
  margin: 0 auto;
  line-height: 1.7;
  color: #4a5568;
}

.comparison-table {
  margin: 40px 0;
  overflow-x: auto;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  border-radius: 12px;
}

.comparison-table table {
  width: 100%;
  border-collapse: collapse;
  background: white;
}

.comparison-table th, 
.comparison-table td {
  padding: 16px 24px;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
}

.comparison-table th {
  background-color: #274c77;
  color: white;
  font-weight: 600;
}

.comparison-table tr:nth-child(even) {
  background-color: #f8fafc;
}

.comparison-table tr:hover {
  background-color: #f1f5f9;
}

.comparison-table i {
  margin-right: 8px;
  color: #274c77;
}

.pro-tips {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.pro-tips h3 {
  color: #2d3748;
  margin-bottom: 20px;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pro-tips ul {
  padding-left: 20px;
}

.pro-tips li {
  margin-bottom: 12px;
  position: relative;
}

.pro-tips li:before {
  content: "•";
  color:#274c77;
  font-weight: bold;
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}

.pro-tips strong {
  color: #2d3748;
}

@media (max-width: 768px) {
  .comparison-table th, 
  .comparison-table td {
    padding: 12px 16px;
    font-size: 0.9rem;
  }
  
  .pro-tips {
    padding: 20px;
  }
}   

.benefits-section {
  padding: 20px 0;
  background: transparent;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 10px;
}

.benefit-card {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.benefit-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.benefit-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #274c77 0%, #3a0ca3 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: white;
  font-size: 24px;
}

.benefit-card h3 {
  color: #2d3748;
  margin-bottom: 15px;
  font-size: 1.3rem;
}

.benefit-card p {
  color: #4a5568;
  line-height: 1.7;
}

@media (max-width: 768px) {
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  
  .benefit-card {
    padding: 25px;
  }
}

.tech-specs-section {
  padding: 20px 0;
  background-color: transparent;
}

.specs-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 10px;
}

.specs-card {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.specs-card h3 {
  color: #2d3748;
  margin-bottom: 20px;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.specs-card h3 i {
  color: #274c77;
}

.specs-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.specs-list li {
  padding: 10px 0;
  border-bottom: 1px solid #edf2f7;
  color: #4a5568;
}

.specs-list li:last-child {
  border-bottom: none;
}

.specs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.spec-item {
  text-align: center;
  padding: 15px;
  background: #f6f9fc;
  border-radius: 8px;
}

.spec-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: #4361ee;
  margin-bottom: 5px;
}

.spec-label {
  font-size: 0.9rem;
  color: #718096;
}

@media (max-width: 768px) {
  .specs-container {
    grid-template-columns: 1fr;
  }
  
  .specs-grid {
    grid-template-columns: 1fr;
  }
}

.expanded-faq-section {
  padding: 20px 0;
  background: linear-gradient(135deg, #f6f9fc 0%, #eef2f6 100%);
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 15px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  background: white;
}

.faq-question {
  width: 100%;
  padding: 20px 25px;
  text-align: left;
  border: none;
  background: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  color: #2d3748;
  font-size: 1.1rem;
  transition: background-color 0.3s ease;
}

.faq-question:hover {
  background-color: #f8fafc;
}

.faq-question i {
  transition: transform 0.3s ease;
}

.faq-question.active i {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 25px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-answer.active {
  padding: 0 25px 25px;
  max-height: 1000px;
}

.faq-answer p {
  margin-bottom: 15px;
  line-height: 1.7;
  color: #4a5568;
}

.faq-answer ul {
  margin-bottom: 15px;
  padding-left: 20px;
}

.faq-answer li {
  margin-bottom: 8px;
  color: #4a5568;
}

.faq-answer table {
  width: 100%;
  border-collapse: collapse;
  margin: 15px 0;
}

.faq-answer th, 
.faq-answer td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
}

.faq-answer th {
  background-color: #f1f5f9;
  font-weight: 600;
}

@media (max-width: 768px) {
  .faq-question {
    padding: 15px 20px;
    font-size: 1rem;
  }
  
  .faq-answer {
    padding: 0 20px;
  }
  
  .faq-answer.active {
    padding: 0 20px 20px;
  }
}