:root {
    --primary-color: #4a6bff;
    --secondary-color: #f8f9fa;
    --accent-color: #ff6b6b;
    --text-color: #333;
    --light-text: #6c757d;
    --border-color: #dee2e6;
    --success-color: #28a745;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7ff;
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.headerpdf {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 2.5rem;
}

.subtitle {
    color: var(--light-text);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.upload-section {
    background-color: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--shadow);
    text-align: center;
}

.upload-container {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 40px 20px;
    margin: 20px 0;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.upload-container:hover {
    border-color: var(--primary-color);
    background-color: rgba(74, 107, 255, 0.05);
}

.upload-container.drag-over {
    border-color: var(--primary-color);
    background-color: rgba(74, 107, 255, 0.1);
}

.upload-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.upload-text {
    margin-bottom: 15px;
}

.upload-text h3 {
    margin-bottom: 5px;
    color: var(--primary-color);
}

.upload-text p {
    color: var(--light-text);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn:hover {
    background-color: #3a5bef;
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: rgba(74, 107, 255, 0.1);
}

.btn-danger {
    background-color: var(--accent-color);
}

.btn-danger:hover {
    background-color: #e05555;
}

.file-input {
    display: none;
}

.file-info {
    color: var(--light-text);
    font-style: italic;
}

.preview-section {
    display: none;
    background-color: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--shadow);
}

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

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

.preview-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

@media (min-width: 992px) {
    .preview-content {
        flex-direction: row;
    }
}

.preview-column {
    flex: 1;
    min-height: 500px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    overflow: auto;
}

.preview-column h4 {
    text-align: center;
    margin-bottom: 15px;
    color: var(--primary-color);
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.progress-container {
    margin: 30px 0;
    display: none;
}

.progress-bar {
    height: 10px;
    background-color: var(--secondary-color);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 10px;
}

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

.progress-text {
    text-align: center;
    color: var(--light-text);
}

.result-section {
    display: none;
    background-color: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--shadow);
    text-align: center;
}

.result-icon {
    font-size: 60px;
    color: var(--success-color);
    margin-bottom: 20px;
}

.result-message h2 {
    color: var(--success-color);
    margin-bottom: 15px;
}

.result-message p {
    color: var(--light-text);
    margin-bottom: 25px;
}

.ad-container {
    margin: 30px 0;
    text-align: center;
}

.ad-large {
    width: 100%;
    height: 90px;
    background-color: #f0f0f0;
    border: 1px dashed var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 20px 0;
    border-radius: 5px;
}

.ad-small {
    width: 100%;
    height: 250px;
    background-color: #f0f0f0;
    border: 1px dashed var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 20px 0;
    border-radius: 5px;
}

.ad-label {
    color: var(--light-text);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

footer {
    text-align: center;
    padding: 20px;
    margin-top: 50px;
    color: var(--light-text);
    font-size: 0.9rem;
}

/* Scroll buttons */
.scroll-buttons {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 100;
}

.scroll-buttons button {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.scroll-buttons button:hover {
    background-color: #3a5bef;
    transform: translateY(-3px);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .preview-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .preview-title {
        font-size: 1.3rem;
    }
}