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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #16a34a;
    --danger-color: #dc2626;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --border-color: #e5e7eb;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --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);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-color);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-white);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 0.95rem;
    opacity: 0.95;
}

/* Disclaimer Banner */
.disclaimer-banner {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 30px 10px;
    border-radius: 8px;
    color: #92400e;
}

.disclaimer-banner svg {
    flex-shrink: 0;
    color: #f59e0b;
}

.disclaimer-banner a {
    color: #92400e;
    text-decoration: underline;
    font-weight: 600;
}

.disclaimer-banner a:hover {
    color: #78350f;
}

.disclaimer-banner a:focus {
    outline: 2px solid #f59e0b;
    outline-offset: 2px;
}

.security-notice {
    background: #dbeafe;
    border-left: 4px solid #2563eb;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 10px 30px 20px;
    border-radius: 8px;
    color: #1e40af;
}

.security-notice svg {
    flex-shrink: 0;
}

main {
    padding: 30px;
}

.input-group {
    margin-bottom: 30px;
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

.input-group input[type="text"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
    font-family: inherit;
}

.input-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-group small {
    display: block;
    margin-top: 6px;
    color: var(--text-light);
    font-size: 0.875rem;
}

.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: 12px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-light);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: #eff6ff;
}

.upload-area.drag-over {
    border-color: var(--primary-color);
    background: #dbeafe;
    transform: scale(1.02);
}

.upload-area svg {
    color: var(--primary-color);
    margin-bottom: 16px;
}

.upload-text {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 6px;
}

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

.file-info {
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 20px;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 12px;
}

.file-details svg {
    color: var(--primary-color);
}

.btn-clear {
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 6px;
    transition: all 0.2s;
}

.btn-clear:hover {
    background: var(--danger-color);
    color: white;
}

.action-section {
    margin-top: 30px;
}

.btn {
    width: 100%;
    padding: 16px 24px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-white);
    border-color: var(--text-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover:not(:disabled) {
    background: #15803d;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Preview Section */
.preview-section {
    margin-top: 30px;
    padding: 25px;
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 12px;
}

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

.preview-header h3 {
    font-size: 1.25rem;
    color: var(--text-color);
    margin: 0;
}

.btn-close-preview {
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 6px;
    transition: all 0.2s;
}

.btn-close-preview:hover {
    background: var(--danger-color);
    color: white;
}

.preview-container {
    margin-bottom: 20px;
}

.drag-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px;
    background: #e3f2fd;
    border-radius: 8px;
    margin-bottom: 15px;
    color: #1976d2;
    font-size: 0.9rem;
}

.drag-info svg {
    flex-shrink: 0;
}

.btn-lock {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: #2196f3;
    color: white;
    border: 2px solid #1976d2;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 700;
    transition: all 0.2s ease;
    white-space: nowrap;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-lock:hover {
    background: #1976d2;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.4);
    border-color: #0d47a1;
}

.btn-lock:active {
    transform: translateY(0);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.btn-lock.locked {
    background: #f44336;
    border-color: #d32f2f;
    animation: pulse 2s infinite;
}

.btn-lock.locked:hover {
    background: #d32f2f;
    border-color: #b71c1c;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }
    50% {
        box-shadow: 0 2px 12px rgba(244, 67, 54, 0.5);
    }
}

.pdf-viewer-wrapper {
    position: relative;
    width: 210mm; /* A4 width */
    height: 350mm; /* Longer height for better visibility */
    max-width: 100%;
    max-height: 90vh;
    border: 2px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
    background: #f9f9f9;
    margin: 20px auto; /* Center the viewer */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.pdf-viewer {
    border: none;
    display: block;
    max-width: 100%;
    max-height: 100%;
    pointer-events: none; /* Prevent interaction with PDF canvas */
    image-rendering: auto; /* Smooth rendering */
    image-rendering: -webkit-optimize-contrast; /* Better quality on Safari */
}

.watermark-overlay {
    position: absolute;
    cursor: move;
    z-index: 10;
    user-select: none;
    touch-action: none; /* Prevent default touch behaviors (scrolling, zooming) */
    -webkit-user-select: none; /* iOS Safari */
    -webkit-touch-callout: none; /* iOS Safari - prevent callout menu */
    transition: none; /* Remove transition for smooth dragging */
}

.watermark-overlay.dragging {
    border: 3px solid #3b82f6;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.6), 0 0 40px rgba(59, 130, 246, 0.3);
    transform: scale(1.05);
    z-index: 20;
}

.watermark-overlay.locked {
    opacity: 0.6;
    cursor: not-allowed;
}

.watermark-overlay.locked .watermark-lock-btn {
    background: #f44336;
    border-color: #d32f2f;
}

.watermark-overlay.locked .watermark-lock-btn:hover {
    background: #d32f2f;
    border-color: #b71c1c;
}

.watermark-lock-btn {
    position: absolute;
    top: -12px;
    right: -12px;
    width: 24px;
    height: 24px;
    background: #2196f3;
    border: 2px solid #1976d2;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    z-index: 15;
}

.watermark-lock-btn:hover {
    background: #1976d2;
    transform: scale(1.1);
    box-shadow: 0 4px 8px rgba(33, 150, 243, 0.4);
}

.watermark-lock-btn svg {
    width: 12px;
    height: 12px;
    color: white;
    transition: all 0.2s ease;
}

.watermark-lock-btn.locked {
    background: #f44336;
    border-color: #d32f2f;
    animation: pulse 2s infinite;
}

.watermark-lock-btn.locked:hover {
    background: #d32f2f;
    border-color: #b71c1c;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    }
    50% {
        box-shadow: 0 2px 12px rgba(244, 67, 54, 0.5);
    }
}

.watermark-overlay[data-ic="front"] {
    top: 20%;
    left: 15%;
}

.watermark-overlay[data-ic="back"] {
    top: 65%;
    left: 15%;
}

.watermark-overlay:hover {
    opacity: 0.95;
}

.watermark-overlay:active {
    cursor: grabbing;
}

/* Better touch handling on mobile */
@media (hover: none) and (pointer: coarse) {
    .watermark-overlay {
        /* Larger tap target for mobile */
        min-width: 44px;
        min-height: 44px;
    }
    
    .watermark-lock-btn {
        /* Larger lock button for easier tapping */
        width: 32px;
        height: 32px;
        top: -16px;
        right: -16px;
    }
    
    .watermark-lock-btn svg {
        width: 16px;
        height: 16px;
    }
}

.watermark-label {
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    background: #3b82f6;
    color: white;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.watermark-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0;
    color: rgba(0, 0, 0, 0.6);
    font-weight: 600;
    font-size: 12px;
    transform: rotate(-30deg); /* -30 degree angle (mirrored to the right) */
    white-space: pre-line; /* Allow text to wrap to multiple lines */
    max-width: 280px; /* Match the maxTextWidth from JavaScript - fits ~45 chars */
    text-align: center;
    word-wrap: break-word;
    position: relative;
    background: rgba(255, 255, 255, 0.15);
    border: 2px dashed rgba(59, 130, 246, 0.6);
    border-radius: 4px;
    padding: 15px 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.watermark-preview::before,
.watermark-preview::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: 1px;
    background: currentColor;
}

.watermark-preview::before {
    top: 5px;
}

.watermark-preview::after {
    bottom: 5px;
}

.preview-info {
    background: #dbeafe;
    border: 2px solid #3b82f6;
    border-radius: 10px;
    padding: 20px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 20px;
    color: #1e40af;
}

.preview-info svg {
    flex-shrink: 0;
    margin-top: 2px;
}

.preview-info span {
    line-height: 1.5;
}

.updating-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    color: #3b82f6;
    font-size: 0.875rem;
    font-weight: 600;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid #dbeafe;
    border-top-color: #3b82f6;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.fallback-message {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    background: #f9fafb;
    padding: 40px;
    text-align: center;
}

.fallback-message svg {
    color: #6b7280;
}

.fallback-message p {
    font-size: 1.125rem;
    color: var(--text-color);
    margin: 0;
    font-weight: 600;
}

.preview-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.progress-section {
    margin-top: 30px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-light);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 10px;
}

.progress-text {
    text-align: center;
    color: var(--text-light);
    font-size: 0.875rem;
}

.success-message {
    background: #dcfce7;
    border: 2px solid var(--success-color);
    border-radius: 10px;
    padding: 16px 20px;
    margin-top: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: #166534;
    font-weight: 600;
}

.success-message svg {
    flex-shrink: 0;
    color: var(--success-color);
}

footer {
    background: var(--bg-light);
    padding: 30px;
    border-top: 1px solid var(--border-color);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-color);
    font-size: 0.875rem;
    font-weight: 500;
}

.feature svg {
    color: var(--success-color);
    flex-shrink: 0;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 25px;
    padding-top: 25px;
    border-top: 1px solid var(--border-color);
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.footer-note {
    text-align: center;
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Info Box */
.info-box {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 25px;
    border-radius: 8px;
    color: #92400e;
    font-size: 0.875rem;
}

.info-box svg {
    flex-shrink: 0;
    color: #f59e0b;
}

/* Position Controls */
.position-controls {
    margin-bottom: 25px;
}

.control-label {
    display: block;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
}

.preset-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.btn-preset {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    background: var(--bg-white);
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: var(--text-color);
    font-family: inherit;
}

.btn-preset:hover {
    border-color: var(--primary-color);
    background: #eff6ff;
}

.btn-preset.active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.btn-preset svg {
    flex-shrink: 0;
}

/* Advanced Controls */
.advanced-controls {
    margin-bottom: 25px;
}

.toggle-advanced {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    background: var(--bg-light);
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-color);
    font-family: inherit;
}

.toggle-advanced:hover {
    border-color: var(--primary-color);
    background: #eff6ff;
}

.toggle-advanced .chevron {
    margin-left: auto;
    transition: transform 0.3s;
}

.toggle-advanced.open .chevron {
    transform: rotate(180deg);
}

.advanced-panel {
    margin-top: 15px;
    padding: 20px;
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 10px;
}

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

.slider-group:last-of-type {
    margin-bottom: 15px;
}

.slider-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

.slider-group label span {
    color: var(--primary-color);
    float: right;
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 5px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: all 0.2s;
}

.slider::-webkit-slider-thumb:hover {
    background: var(--primary-hover);
    transform: scale(1.2);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.slider::-moz-range-thumb:hover {
    background: var(--primary-hover);
    transform: scale(1.2);
}

.btn-reset {
    width: 100%;
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    background: var(--bg-white);
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-light);
    font-family: inherit;
}

.btn-reset:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: #eff6ff;
}

@media (max-width: 640px) {
    body {
        padding: 10px;
    }

    header {
        padding: 30px 20px;
    }

    header h1 {
        font-size: 1.5rem;
    }

    main {
        padding: 20px;
    }

    .security-notice {
        margin: 15px 20px;
        font-size: 0.875rem;
    }

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

    .features {
        grid-template-columns: 1fr;
    }

    .preset-buttons {
        grid-template-columns: 1fr;
    }

    .page-tabs {
        flex-direction: column;
    }

    .preview-actions {
        grid-template-columns: 1fr;
    }
}

/* Animation for success */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.success-message {
    animation: slideIn 0.3s ease;
}

/* Ad Container Styling */
.ad-container {
    width: 100%;
    max-width: 800px;
    margin: 20px auto;
    padding: 10px;
    text-align: center;
    background: #f9fafb;
    border-radius: 8px;
    min-height: 90px;
}

.ad-container.ad-top {
    margin: 20px auto 0;
}

.ad-container.ad-in-content {
    margin: 30px auto;
}

.ad-container.ad-bottom {
    margin: 20px auto;
}

.ad-container ins {
    display: block;
    min-height: 90px;
}

@media (max-width: 640px) {
    .ad-container {
        margin: 15px auto;
        padding: 8px;
    }
}

/* Cookie Consent Banner */
.cookie-consent {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #1f2937;
    color: white;
    padding: 20px;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

.cookie-consent-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
}

.cookie-consent-content p {
    margin: 0;
    flex: 1;
    min-width: 250px;
}

.cookie-consent-content p strong {
    display: block;
    margin-bottom: 8px;
    font-size: 1.1em;
}

.cookie-consent-content a {
    color: #60a5fa;
    text-decoration: underline;
}

.cookie-consent-content a:hover {
    color: #93c5fd;
}

.cookie-consent-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn-cookie {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.btn-cookie.accept {
    background: #16a34a;
    color: white;
}

.btn-cookie.accept:hover {
    background: #15803d;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(22, 163, 74, 0.3);
}

.btn-cookie.decline {
    background: #6b7280;
    color: white;
}

.btn-cookie.decline:hover {
    background: #4b5563;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(107, 114, 128, 0.3);
}

@media (max-width: 768px) {
    .cookie-consent-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .cookie-consent-buttons {
        width: 100%;
    }
    
    .btn-cookie {
        flex: 1;
    }
}