/* Image to PDF Converter Pro - Professional Full Width Design */
:root {
    --primary-color: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --secondary-color: #7c3aed;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #06b6d4;
    --light-bg: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease-in-out;
}

/* Reset and Base Styles */
.image-to-pdf-container * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.image-to-pdf-container {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--light-bg);
    min-height: 100vh;
}

/* Header Styles */
.itpdf-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 4rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.itpdf-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(255,255,255,0.1)"/></svg>');
    background-size: cover;
}

.itpdf-header-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

.itpdf-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, #e2e8f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.itpdf-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    font-weight: 400;
    line-height: 1.6;
}

/* Main Content Layout */
.itpdf-main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Section Headers */
.itpdf-section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.itpdf-section-header h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.itpdf-section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Upload Section */
.itpdf-upload-section {
    margin: 3rem 0;
}

.itpdf-drop-zone {
    background: var(--card-bg);
    border: 3px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.itpdf-drop-zone:hover,
.itpdf-drop-zone.dragover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.02);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.itpdf-drop-content {
    max-width: 500px;
    margin: 0 auto;
}

.itpdf-drop-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    opacity: 0.8;
    display: block;
}

.itpdf-drop-zone h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.itpdf-drop-zone p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.itpdf-supported-formats {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: 1rem;
}

/* Button Styles */
.itpdf-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.itpdf-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.itpdf-btn:hover::before {
    left: 100%;
}

.itpdf-btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    box-shadow: var(--shadow-md);
}

.itpdf-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.itpdf-btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.itpdf-btn-secondary:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.itpdf-btn-success {
    background: linear-gradient(135deg, var(--success-color), #34d399);
    color: white;
    box-shadow: var(--shadow-md);
}

.itpdf-btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.itpdf-btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.itpdf-btn-icon {
    font-size: 1.25rem;
}

.itpdf-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: var(--shadow-sm) !important;
}

/* File Input */
.itpdf-file-input {
    display: none;
}

/* Thumbnails Section */
.itpdf-thumbnails-section {
    margin: 4rem 0;
}

.itpdf-thumbnails-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.itpdf-thumbnail {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    cursor: move;
    border: 2px solid transparent;
}

.itpdf-thumbnail:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.itpdf-thumbnail img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block;
}

.itpdf-thumbnail-actions {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: var(--transition);
}

.itpdf-thumbnail:hover .itpdf-thumbnail-actions {
    opacity: 1;
}

.itpdf-thumbnail-btn {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition-fast);
    backdrop-filter: blur(10px);
}

.itpdf-thumbnail-btn:hover {
    background: rgba(0, 0, 0, 0.9);
    transform: scale(1.1);
}

.itpdf-thumbnail-number {
    position: absolute;
    bottom: 0.75rem;
    left: 0.75rem;
    background: var(--primary-color);
    color: white;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

/* Progress Section */
.itpdf-progress-section {
    margin: 4rem 0;
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-lg);
}

.itpdf-progress-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.itpdf-progress-bar {
    height: 0.75rem;
    background: var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    margin: 2rem 0;
    box-shadow: inset var(--shadow-sm);
}

.itpdf-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success-color), var(--info-color));
    width: 0%;
    transition: width 0.4s ease;
    border-radius: 1rem;
}

.itpdf-progress-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 2rem;
}

.itpdf-action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Options Section */
.itpdf-options-section {
    margin: 4rem 0;
}

.itpdf-options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.itpdf-option-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    height: fit-content;
}

.itpdf-option-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.itpdf-option-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--light-bg);
}

.itpdf-option-icon {
    font-size: 1.5rem;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light-bg);
    border-radius: var(--border-radius);
}

.itpdf-option-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.itpdf-option-content {
    space-y: 1.5rem;
}

/* Form Styles */
.itpdf-form-group {
    margin-bottom: 1.5rem;
}

.itpdf-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.itpdf-form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.itpdf-color-input {
    height: 3rem;
    padding: 0.25rem;
    cursor: pointer;
    border-radius: var(--border-radius);
}

/* Range Inputs */
.itpdf-range {
    width: 100%;
    height: 0.5rem;
    border-radius: 1rem;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
}

.itpdf-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: var(--transition-fast);
}

.itpdf-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.itpdf-range-value {
    font-weight: 600;
    color: var(--primary-color);
    margin-left: 0.5rem;
}

/* Toggle Switch */
.itpdf-toggle {
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
}

.itpdf-toggle input {
    display: none;
}

.itpdf-toggle-slider {
    width: 3rem;
    height: 1.5rem;
    background: var(--border-color);
    border-radius: 2rem;
    position: relative;
    transition: var(--transition-fast);
}

.itpdf-toggle-slider::before {
    content: '';
    position: absolute;
    top: 0.125rem;
    left: 0.125rem;
    width: 1.25rem;
    height: 1.25rem;
    background: white;
    border-radius: 50%;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

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

.itpdf-toggle input:checked + .itpdf-toggle-slider::before {
    transform: translateX(1.5rem);
}

.itpdf-toggle-label {
    font-weight: 600;
    color: var(--text-primary);
}

/* Footer */
.itpdf-footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: 4rem;
}

.itpdf-footer-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.itpdf-footer p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.itpdf-version {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* Toast Notifications */
.itpdf-toast-container {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 10000;
    max-width: 400px;
}

.itpdf-toast {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transform: translateX(400px);
    transition: var(--transition);
    border-left: 4px solid var(--info-color);
}

.itpdf-toast.show {
    transform: translateX(0);
}

.itpdf-toast.success {
    border-left-color: var(--success-color);
}

.itpdf-toast.error {
    border-left-color: var(--error-color);
}

.itpdf-toast.warning {
    border-left-color: var(--warning-color);
}

.itpdf-toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

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

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

.itpdf-toast.warning .itpdf-toast-icon {
    color: var(--warning-color);
}

.itpdf-toast-message {
    flex: 1;
    font-weight: 500;
    color: var(--text-primary);
}

.itpdf-toast-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-light);
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.itpdf-toast-close:hover {
    background: var(--light-bg);
    color: var(--text-primary);
}

/* Drag and Drop States */
.itpdf-thumbnail.dragging {
    opacity: 0.6;
    transform: scale(0.95) rotate(5deg);
}

.itpdf-thumbnail.over {
    border: 2px dashed var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

/* Preview Modal */
.itpdf-preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10001;
    backdrop-filter: blur(5px);
    padding: 2rem;
}

.itpdf-modal-content {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
}

.itpdf-modal-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.itpdf-modal-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.itpdf-modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-light);
    padding: 0;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.itpdf-modal-close:hover {
    background: var(--light-bg);
    color: var(--text-primary);
}

.itpdf-modal-body {
    flex: 1;
    padding: 0;
    overflow: hidden;
}

.itpdf-modal-footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* Loading State */
.itpdf-loading {
    pointer-events: none;
    opacity: 0.7;
    position: relative;
}

.itpdf-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 1.5rem;
    height: 1.5rem;
    margin: -0.75rem 0 0 -0.75rem;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .itpdf-options-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
}

@media (max-width: 768px) {
    .itpdf-main-content {
        padding: 0 1rem;
    }
    
    .itpdf-header {
        padding: 3rem 1rem;
    }
    
    .itpdf-header h1 {
        font-size: 2.25rem;
    }
    
    .itpdf-subtitle {
        font-size: 1.125rem;
    }
    
    .itpdf-section-header h2 {
        font-size: 1.875rem;
    }
    
    .itpdf-options-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .itpdf-form-row {
        grid-template-columns: 1fr;
    }
    
    .itpdf-thumbnails-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 1rem;
    }
    
    .itpdf-thumbnail img {
        height: 140px;
    }
    
    .itpdf-action-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .itpdf-progress-section {
        padding: 2rem;
    }
    
    .itpdf-option-card {
        padding: 1.5rem;
    }
    
    .itpdf-drop-zone {
        padding: 3rem 1rem;
    }
}

@media (max-width: 480px) {
    .itpdf-header h1 {
        font-size: 2rem;
    }
    
    .itpdf-thumbnails-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .itpdf-thumbnail img {
        height: 120px;
    }
    
    .itpdf-modal-content {
        margin: 1rem;
    }
    
    .itpdf-modal-footer {
        flex-direction: column;
    }
}

/* Print Styles */
@media print {
    .itpdf-header,
    .itpdf-upload-section,
    .itpdf-thumbnails-section,
    .itpdf-progress-section,
    .itpdf-options-section,
    .itpdf-footer {
        display: none !important;
    }
}

/* Focus styles for accessibility */
.itpdf-btn:focus,
input:focus,
select:focus,
.itpdf-thumbnail-btn:focus,
.itpdf-toast-close:focus,
.itpdf-modal-close:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.8);
    }
    
    .itpdf-option-card {
        border: 2px solid var(--border-color);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}