/* PDF Splitter Styles */
:root {
    --primary-color: #4361ee;
    --primary-hover: #3a56d4;
    --secondary-color: #f8f9fa;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --text-color: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --background-color: #ffffff;
    --card-background: #ffffff;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #5a78ff;
        --primary-hover: #4361ee;
        --secondary-color: #1e2124;
        --success-color: #2ecc71;
        --danger-color: #e74c3c;
        --text-color: #e2e8f0;
        --text-secondary: #a0aec0;
        --border-color: #4a5568;
        --background-color: #121212;
        --card-background: #1e2124;
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    }
    
    body {
        background-color: var(--background-color);
        color: var(--text-color);
    }
}

/* Dark Mode Toggle */
.theme-toggle {
    background: transparent;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle-menu-item {
    display: flex;
    align-items: center;
    margin-left: 1rem;
}

.theme-toggle:hover {
    transform: translateY(-2px);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: var(--text-color);
}

/* Body */
body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem;
    flex: 1;
}

.tool-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.tool-header h1 {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.tool-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* How It Works Section */
.how-it-works {
    text-align: center;
    margin: 1.5rem 0 2rem;
}

.instruction-image {
    max-width: 75%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin: 0 auto;
}

/* Upload Area Styles */
.upload-container {
    margin-bottom: 2rem;
    margin-top: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.upload-area {
    background-color: var(--secondary-color);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3.5rem 2rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.05);
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 1.5rem;
}

.upload-area h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.upload-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 2rem;
    border-radius: var(--radius-md);
    margin: 1rem 0;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.upload-button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.file-info {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Processing Options */
.processing-options {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    margin-top: 1.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    gap: 1rem;
    flex-wrap: wrap;
}

.split-all-btn {
    background-color: var(--success-color);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.split-all-btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

/* Loading Indicator */
.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 2rem 0;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 1rem;
}

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

/* PDF Pages Container */
.pages-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
    margin-bottom: 3rem;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.page-card {
    background-color: var(--card-background);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.page-preview {
    width: 100%;
    height: 350px;
    background-color: var(--secondary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.page-preview canvas {
    max-width: 100%;
    max-height: 100%;
    box-shadow: var(--shadow-sm);
}

.page-number {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: var(--primary-color);
    color: white;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: bold;
}

.page-controls {
    padding: 1.5rem;
}

.filename-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-color);
    font-weight: 500;
}

.filename-input {
    width: 100%;
    padding: 0.75rem 0.1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    font-size: 0.9rem;
    transition: var(--transition);
    background-color: var(--background-color);
    color: var(--text-color);
}

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

.split-btn {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 0;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

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

/* Disclaimer */
.disclaimer {
    background-color: var(--card-background);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-top: 4rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.disclaimer h2 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.disclaimer p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.disclaimer p:last-child {
    margin-bottom: 0;
}

/* Footer */
footer {
    background-color: var(--card-background);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.footer-logo img {
    height: 40px;
    margin-right: 1rem;
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-nav a:hover {
    color: var(--primary-color);
}

.footer-copyright {
    width: 100%;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

/* FAQ Section */
.faq-section {
    margin-top: 4rem;
    padding: 2rem 0;
}

.faq-section h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.faq-container {
    display: grid;
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--card-background);
    border-radius: var(--radius-md);
    padding: 0;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.faq-question {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    background-color: rgba(67, 97, 238, 0.05);
}

.faq-item h3 {
    margin: 0;
    color: var(--text-color);
    font-size: 1.2rem;
}

.faq-toggle {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: bold;
    transition: var(--transition);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 1.5rem 1.5rem;
    max-height: 500px;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer p {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* Feature Cards */
.feature-cards {
    margin: 4rem 0;
}

.feature-cards h2 {
    text-align: center;
    margin-bottom: 2.5rem;
    color: var(--text-color);
    font-size: 2rem;
}

.card-row {
    display: grid;
    grid-template-columns: repeat(3, minmax(250px, 300px));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    justify-content: center;
}

.card-row:last-child {
    margin-bottom: 0;
}

.feature-card {
    background-color: var(--card-background);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    max-width: 100%;
    align-items: flex-start;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 50px;
    height: 50px;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: rgba(67, 97, 238, 0.1);
    color: var(--primary-color);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card h3 {
    margin-top: 0;
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 0;
    line-height: 1.5;
    font-size: 0.95rem;
}

/* Dark Mode Classes */
body.dark-mode {
    --primary-color: #5a78ff;
    --primary-hover: #4361ee;
    --secondary-color: #1e2124;
    --text-color: #e2e8f0;
    --text-secondary: #a0aec0;
    --border-color: #4a5568;
    --background-color: #121212;
    --card-background: #1e2124;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
}

/* Responsive Adjustments */
@media (max-width: 992px) {
    .card-row {
        grid-template-columns: repeat(2, minmax(250px, 300px));
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .tool-header h1 {
        font-size: 2rem;
    }
    
    .pages-container {
        grid-template-columns: 1fr;
    }
    
    .instruction-image {
        max-width: 95%;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-logo {
        justify-content: center;
        margin-bottom: 1.5rem;
    }
    
    .footer-nav {
        justify-content: center;
        margin-bottom: 1.5rem;
    }
    
    .card-row {
        grid-template-columns: minmax(250px, 300px);
        justify-content: center;
    }
    
    .faq-container {
        grid-template-columns: 1fr;
    }
}

/* Success notification */
.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 15px 20px;
    background-color: var(--success-color);
    color: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

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