:root {
        --primary-color: #3b82f6;
        --primary-hover: #2563eb;
        --primary-light: #eff6ff;
        --secondary-color: #0f172a;
        --background-color: #f8fafc;
        --border-color: #e2e8f0;
        --success-color: #10b981;
        --error-color: #ef4444;
        --text-primary: #1e293b;
        --text-secondary: #64748b;
        --spacing-unit: 1rem;
        --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1),
          0 2px 4px -2px rgb(0 0 0 / 0.1);
        --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        --border-radius: 1rem;
        --font-family: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
      }

      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      body {
        font-family: var(--font-family);
        line-height: 1.6;
        color: var(--text-primary);
        background: var(--background-color);
        min-height: 100vh;
        padding: 0;
        margin: 0;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        letter-spacing: -0.01em;
      }

      .app-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: calc(var(--spacing-unit) * 2);
        min-height: 100vh;
        display: flex;
        flex-direction: column;
      }

      .app-header {
        text-align: center;
        margin-bottom: calc(var(--spacing-unit) * 3);
        padding: calc(var(--spacing-unit) * 3) 0;
        animation: fadeIn 0.8s ease-out;
        border-bottom: 1px solid var(--border-color);
        background: linear-gradient(to bottom, white, var(--primary-light));
        box-shadow: var(--card-shadow);
        position: relative;
        overflow: hidden;
      }

      .app-header::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(
          to right,
          var(--primary-color),
          var(--primary-hover)
        );
      }

      .app-header h1 {
        font-size: clamp(2rem, 5vw, 2.5rem);
        color: var(--primary-color);
        margin-bottom: 0.75rem;
        font-weight: 700;
        letter-spacing: -0.025em;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.75rem;
      }

      .app-header h1::before {
        content: "picture_as_pdf";
        font-family: "Material Icons Round";
        font-size: 0.9em;
        font-weight: normal;
        background: linear-gradient(
          45deg,
          var(--primary-color),
          var(--primary-hover)
        );
        -webkit-background-clip: text;
        background-clip: text;
        -webkit-text-fill-color: transparent;
      }

      .subtitle {
        color: var(--text-secondary);
        font-size: 1.1rem;
        max-width: 600px;
        margin: 0 auto;
      }

      .subtitle {
        color: var(--secondary-color);
        opacity: 0.8;
      }

      .app-main {
        display: grid;
        gap: 2rem;
        grid-template-columns: 1fr;
      }

      @media (min-width: 768px) {
        .app-main {
          grid-template-columns: repeat(2, 1fr);
        }
      }

      .upload-section {
        grid-column: 1 / -1;
      }

      .dropzone {
        border: 2px dashed var(--border-color);
        border-radius: 1rem;
        padding: calc(var(--spacing-unit) * 3);
        text-align: center;
        transition: var(--transition-base);
        cursor: pointer;
        background: white;
        box-shadow: var(--card-shadow);
        position: relative;
        overflow: hidden;
      }

      .dropzone::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--primary-color);
        opacity: 0;
        transition: var(--transition-base);
        z-index: 0;
      }

      .dropzone.dragover {
        border-color: var(--primary-color);
        transform: scale(1.02);
      }

      .dropzone.dragover::before {
        opacity: 0.05;
      }

      .upload-icon {
        margin-bottom: 1.5rem;
        color: var(--primary-color);
      }

      .upload-icon .material-icons-round {
        font-size: 4rem;
        animation: float 3s ease-in-out infinite;
      }

      .upload-title {
        font-size: 1.25rem;
        font-weight: 600;
        margin-bottom: 0.5rem;
        color: var(--text-primary);
      }

      .upload-subtitle {
        color: var(--text-secondary);
        margin-bottom: 1rem;
        font-size: 0.9rem;
      }

      .file-input {
        display: none;
      }

      @keyframes float {
        0%,
        100% {
          transform: translateY(0);
        }
        50% {
          transform: translateY(-10px);
        }
      }

      .info-icon {
        font-size: 1rem;
        vertical-align: middle;
        margin-right: 0.25rem;
        color: var(--text-secondary);
      }

      .upload-button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 0.75rem 1.5rem;
        background-color: var(--primary-color);
        color: white;
        border-radius: 0.75rem;
        cursor: pointer;
        transition: var(--transition-base);
        margin: 1rem 0;
        font-weight: 500;
        box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
        position: relative;
        overflow: hidden;
      }

      .upload-button::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(
          to right,
          transparent,
          rgba(255, 255, 255, 0.2),
          transparent
        );
        transform: translateX(-100%);
        transition: transform 0.6s;
      }

      .upload-button:hover {
        background-color: var(--primary-hover);
        transform: translateY(-2px);
        box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
      }

      .upload-button:hover::before {
        transform: translateX(100%);
      }

      .upload-hint {
        color: var(--secondary-color);
        opacity: 0.7;
        font-size: 0.9rem;
      }

      .preview-section {
        grid-column: 1 / -1;
      }

      .preview-section {
        background: white;
        border-radius: var(--border-radius);
        padding: var(--spacing-unit);
        box-shadow: var(--card-shadow);
      }

      .preview-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
        margin-top: 1rem;
        background: white;
        min-height: 100px;
        max-height: 70vh;
        overflow-y: auto;
        padding: 0.5rem;
      }

      .preview-item {
        position: relative;
        border-radius: 0.5rem;
        overflow: hidden;
        background: white;
        border: 2px solid var(--border-color);
        height: 240px;
        display: flex;
        flex-direction: column;
      }

      .preview-item.sortable-ghost {
        background: var(--primary-light);
        border-color: var(--primary-color);
        opacity: 0.7;
      }

      .preview-item.sortable-ghost {
        opacity: 0.3;
        transform: scale(0.95);
      }

      .preview-item .image-container {
        flex: 1;
        position: relative;
        overflow: hidden;
        background: #f8f8f8;
        display: flex;
        align-items: center;
        justify-content: center;
      }

      .preview-item img {
        max-width: 100%;
        max-height: 100%;
        object-fit: contain;
        padding: 0.5rem;
      }

      .image-info {
        background: white;
        border-top: 1px solid var(--border-color);
        padding: 0.75rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 0.5rem;
      }

      .image-info .file-details {
        display: flex;
        flex-direction: column;
        gap: 0.25rem;
        flex: 1;
        min-width: 0;
      }

      .preview-item:hover .image-info {
        opacity: 1;
      }

      .drag-handle {
        cursor: move;
        font-size: 1.25rem;
        color: rgba(255, 255, 255, 0.8);
      }

      .image-name {
        flex: 1;
        margin-right: 0.5rem;
        font-size: 0.95rem;
        font-weight: 500;
        color: var(--text-primary);
        line-height: 1.2;
        word-break: break-word;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        line-clamp: 2;
        -webkit-box-orient: vertical;
        box-orient: vertical;
        overflow: hidden;
        text-overflow: ellipsis;
      }

      .preview-section {
        max-height: 80vh;
        overflow: hidden;
        display: flex;
        flex-direction: column;
      }

      .remove-image {
        position: absolute;
        top: 8px;
        right: 8px;
        width: 24px;
        height: 24px;
        background: rgba(0, 0, 0, 0.5);
        border: none;
        border-radius: 50%;
        color: white;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: background-color 0.2s;
      }

      .remove-image:hover {
        background: rgba(229, 62, 62, 0.8);
      }

      .settings-section {
        background: white;
        padding: calc(var(--spacing-unit) * 2.5);
        border-radius: var(--border-radius);
        box-shadow: var(--card-shadow);
        transition: var(--transition-base);
        border: 1px solid var(--border-color);
      }

      .settings-section:hover {
        box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
        border-color: var(--primary-color);
      }

      .settings-form {
        display: grid;
        gap: calc(var(--spacing-unit) * 2);
      }

      .settings-section h2 {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        margin-bottom: 1.5rem;
        padding-bottom: 1rem;
        border-bottom: 1px solid var(--border-color);
      }

      /* New styles for image actions */
      .image-actions {
        display: flex;
        align-items: center;
        gap: 0.5rem;
      }

      .action-btn {
        background: none;
        border: none;
        padding: 0.25rem;
        cursor: pointer;
        color: var(--text-secondary);
        border-radius: 0.25rem;
        transition: var(--transition-base);
      }

      .action-btn:hover {
        color: var(--primary-color);
        background: var(--primary-light);
      }

      .remove-btn:hover {
        color: var(--error-color);
        background: rgba(239, 68, 68, 0.1);
      }

      /* Range input styling */
      input[type="range"] {
        width: 100%;
        height: 6px;
        background: var(--border-color);
        border-radius: 3px;
        outline: none;
        -webkit-appearance: none;
      }

      input[type="range"]::-webkit-slider-thumb {
        -webkit-appearance: none;
        width: 18px;
        height: 18px;
        background: var(--primary-color);
        border-radius: 50%;
        cursor: pointer;
        transition: var(--transition-base);
      }

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

      .range-value {
        text-align: center;
        color: var(--text-secondary);
        font-size: 0.9rem;
        margin-top: 0.5rem;
      }

      /* Checkbox styling */
      .checkbox-label {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        cursor: pointer;
      }

      .checkbox-label input[type="checkbox"] {
        width: 1.2rem;
        height: 1.2rem;
        border-radius: 0.25rem;
        border: 2px solid var(--border-color);
        position: relative;
        cursor: pointer;
        -webkit-appearance: none;
        transition: var(--transition-base);
      }

      .checkbox-label input[type="checkbox"]:checked {
        background-color: var(--primary-color);
        border-color: var(--primary-color);
      }

      .checkbox-label input[type="checkbox"]:checked::after {
        content: "";
        position: absolute;
        left: 4px;
        top: 1px;
        width: 6px;
        height: 10px;
        border: solid white;
        border-width: 0 2px 2px 0;
        transform: rotate(45deg);
      }

      .settings-section h2::before {
        content: "settings";
        font-family: "Material Icons Round";
        color: var(--primary-color);
        font-size: 1.5rem;
        font-weight: normal;
      }

      .settings-section h2 {
        color: var(--primary-color);
        margin-bottom: var(--spacing-unit);
        font-weight: 600;
      }

      .form-group {
        display: grid;
        gap: 0.5rem;
      }

      .form-group label {
        font-weight: 500;
        display: flex;
        align-items: center;
        gap: 0.5rem;
        margin-bottom: 0.5rem;
        color: var(--text-primary);
      }

      .form-group label .material-icons-round {
        color: var(--primary-color);
        font-size: 1.25rem;
      }

      select,
      input[type="text"],
      input[type="number"] {
        padding: 0.75rem 1rem;
        border: 2px solid var(--border-color);
        border-radius: var(--border-radius);
        font-size: 1rem;
        transition: var(--transition-base);
        width: 100%;
        background: white;
        color: var(--text-primary);
        font-family: var(--font-family);
      }

      select:hover,
      input[type="text"]:hover,
      input[type="number"]:hover {
        border-color: var(--primary-color);
        box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
      }

      select:focus,
      input:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
      }

      .margins-group .margin-inputs {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 0.5rem;
      }

      .convert-button {
        grid-column: 1 / -1;
        padding: 1rem 2rem;
        background: linear-gradient(
          135deg,
          var(--primary-color),
          var(--primary-hover)
        );
        color: white;
        border: none;
        border-radius: 1rem;
        font-size: 1.1rem;
        font-weight: 600;
        cursor: pointer;
        transition: var(--transition-base);
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.75rem;
        box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
        position: relative;
        overflow: hidden;
        margin: calc(var(--spacing-unit) * 2) 0;
      }

      .convert-button::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(
          to right,
          transparent,
          rgba(255, 255, 255, 0.2),
          transparent
        );
        transform: translateX(-100%);
        transition: transform 0.6s;
      }

      .convert-button:not(:disabled):hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 8px -1px rgba(37, 99, 235, 0.3);
      }

      .convert-button:not(:disabled):hover::before {
        transform: translateX(100%);
      }

      .convert-button:disabled {
        opacity: 0.6;
        cursor: not-allowed;
      }

      .spinner {
        display: none;
        width: 20px;
        height: 20px;
        border: 2px solid transparent;
        border-top-color: white;
        border-radius: 50%;
        animation: spin 1s linear infinite;
      }

      .loading-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.8);
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
        z-index: 1000;
        justify-content: center;
        align-items: center;
        flex-direction: column;
        color: white;
        opacity: 0;
        transition: opacity 0.3s ease-in-out;
      }

      .loading-overlay.active {
        display: flex;
        opacity: 1;
      }

      .loading-spinner {
        width: 50px;
        height: 50px;
        border: 3px solid transparent;
        border-top-color: white;
        border-radius: 50%;
        animation: spin 1s linear infinite;
        margin-bottom: 1rem;
      }

      .toast {
        position: fixed;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%) translateY(100px);
        padding: 1rem 2rem;
        border-radius: 1rem;
        color: white;
        font-weight: 500;
        opacity: 0;
        transition: var(--transition-base);
        z-index: 1000;
        box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.2);
        display: flex;
        align-items: center;
        gap: 0.75rem;
      }

      .toast.success {
        background-color: var(--success-color);
      }

      .toast.error {
        background-color: var(--error-color);
      }

      .toast.show {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
      }

      .toast::before {
        content: "✓";
        font-size: 1.2em;
      }

      .toast.error::before {
        content: "✕";
      }

      .toast.show {
        opacity: 1;
      }

      #confettiCanvas {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        pointer-events: none;
        z-index: 1001;
      }

      .app-footer {
        text-align: center;
        margin-top: 3rem;
        padding: 2rem 0;
        border-top: 1px solid var(--border-color);
        background: white;
        position: relative;
      }

      .app-footer::before {
        content: "";
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(
          to right,
          var(--primary-color),
          var(--primary-hover)
        );
        opacity: 0.5;
      }

      .credits {
        margin-top: 1rem;
        font-size: 0.9rem;
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
      }

      .credits::before {
        content: "favorite";
        font-family: "Material Icons Round";
        color: #ef4444;
        font-size: 1.1rem;
        animation: pulse 1.5s infinite;
      }

      @keyframes pulse {
        0%,
        100% {
          transform: scale(1);
        }
        50% {
          transform: scale(1.2);
        }
      }

      /* Lightbox styles */
      .lightbox {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.9);
        display: none;
        justify-content: center;
        align-items: center;
        z-index: 2000;
        opacity: 0;
        transition: opacity 0.3s ease;
        backdrop-filter: blur(5px);
      }

      .lightbox.active {
        display: flex;
        opacity: 1;
      }

      .lightbox-content {
        position: relative;
        max-width: 90vw;
        max-height: 90vh;
        margin: 20px;
        border-radius: var(--border-radius);
        overflow: hidden;
        background: white;
        box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
      }

      .lightbox-content img {
        display: block;
        max-width: 100%;
        max-height: calc(90vh - 60px);
        object-fit: contain;
      }

      .lightbox-info {
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.95);
        padding: 15px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        border-top: 1px solid var(--border-color);
      }

      .lightbox-details {
        display: flex;
        flex-direction: column;
        gap: 4px;
      }

      .lightbox-details span:first-child {
        font-weight: 500;
        color: var(--text-primary);
      }

      .lightbox-details span:last-child {
        font-size: 0.9em;
        color: var(--text-secondary);
      }

      .lightbox-title {
        font-size: 1.1em;
        font-weight: 600;
        color: var(--text-primary);
        margin-bottom: 4px;
        word-break: break-word;
      }

      .lightbox-subtitle {
        font-size: 0.9em;
        color: var(--text-secondary);
      }

      .lightbox-close {
        background: none;
        border: none;
        color: var(--text-secondary);
        cursor: pointer;
        padding: 8px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all 0.2s ease;
      }

      .lightbox-close:hover {
        background: rgba(0, 0, 0, 0.1);
        color: var(--text-primary);
      }

      /* Image hover effect for lightbox */
      .preview-item .image-container {
        cursor: zoom-in;
      }

      @keyframes fadeIn {
        from {
          opacity: 0;
          transform: translateY(20px) scale(0.95);
        }
        to {
          opacity: 1;
          transform: translateY(0) scale(1);
        }
      }

      @keyframes fadeOut {
        from {
          opacity: 1;
          transform: scale(1);
        }
        to {
          opacity: 0;
          transform: scale(0.95);
        }
      }

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

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

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

      @keyframes shake {
        0%,
        100% {
          transform: translateX(0);
        }
        25% {
          transform: translateX(-5px);
        }
        75% {
          transform: translateX(5px);
        }
      }

      .shake {
        animation: shake 0.5s ease-in-out;
      }

      .preview-item {
        animation: scaleIn 0.3s ease-out;
      }

      .settings-form .form-group {
        animation: slideIn 0.3s ease-out forwards;
        opacity: 0;
      }

      .settings-form .form-group:nth-child(1) {
        animation-delay: 0.1s;
      }
      .settings-form .form-group:nth-child(2) {
        animation-delay: 0.2s;
      }
      .settings-form .form-group:nth-child(3) {
        animation-delay: 0.3s;
      }
      .settings-form .form-group:nth-child(4) {
        animation-delay: 0.4s;
      }
      .settings-form .form-group:nth-child(5) {
        animation-delay: 0.5s;
      }

      @media (max-width: 768px) {
        .app-container {
          padding: var(--spacing-unit);
        }

        .preview-item {
          height: auto;
          min-height: 200px;
        }

        .image-info {
          padding: 0.5rem;
          flex-direction: column;
          gap: 0.5rem;
        }

        .file-details {
          width: 100%;
        }

        .image-name {
          font-size: 0.9rem;
          -webkit-line-clamp: 2;
          line-clamp: 2;
          margin-bottom: 0.25rem;
        }

        .image-meta {
          font-size: 0.75rem !important;
        }

        .image-actions {
          width: 100%;
          justify-content: flex-start;
          gap: 0.75rem;
        }

        .app-header {
          margin-bottom: var(--spacing-unit);
          padding: var(--spacing-unit);
        }

        .app-header h1 {
          font-size: 1.75rem;
        }

        .settings-section {
          grid-column: 1 / -1;
          padding: var(--spacing-unit);
        }

        .margins-group .margin-inputs {
          grid-template-columns: repeat(2, 1fr);
        }

        .preview-grid {
          grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
          gap: var(--spacing-unit);
        }

        .lightbox-content {
          max-width: 95vw;
          margin: 10px;
        }

        .lightbox-info {
          padding: 10px;
        }

        .lightbox-details {
          gap: 2px;
        }

        .lightbox-title {
          font-size: 1rem;
          display: block;
          width: 100%;
        }

        .dropzone {
          padding: var(--spacing-unit);
        }

        .convert-button {
          width: 100%;
          margin: var(--spacing-unit) 0;
        }
      }

      @media (max-width: 480px) {
        .app-header h1 {
          font-size: 1.5rem;
        }

        .preview-grid {
          grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        }

        .settings-form {
          gap: var(--spacing-unit);
        }

        select,
        input[type="text"],
        input[type="number"] {
          padding: 0.5rem 0.75rem;
          font-size: 0.95rem;
        }
      }