/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a90e2;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-gray: #f5f6fa;
    --border-color: #dcdde1;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-gray);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.header {
    background-color: white;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    width: auto;
    max-width: 200px;
    object-fit: contain;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem;
}

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

/* Main Content */
main {
    margin-top: 80px;
    padding: 2rem;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
    flex: 1;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 1rem;
    background: linear-gradient(135deg, #4a90e2 0%, #2c3e50 50%, #8e44ad 100%);
    color: white;
    border-radius: 10px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 2.5rem);
    margin-bottom: 1rem;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Converter Tool Section */
.converter-tool {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.upload-container {
    margin-bottom: 2rem;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover,
.upload-area.drag-over,
.upload-area.highlight {
    border-color: var(--primary-color);
    background-color: rgba(74, 144, 226, 0.05);
}

.upload-area i {
    font-size: clamp(2rem, 5vw, 3rem);
    color: var(--primary-color);
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

.upload-area:hover i,
.upload-area.drag-over i,
.upload-area.highlight i {
    transform: scale(1.1);
}

.upload-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
}

.upload-btn:hover {
    background-color: #357abd;
}

/* Preview Container */
.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.preview-box, .settings-box {
    background: var(--light-gray);
    padding: 1.5rem;
    border-radius: 8px;
}

.preview-image {
    width: 100%;
    height: 300px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
}

.preview-image svg {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 4px;
}

/* Settings Form */
.settings-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--secondary-color);
}

.form-group input {
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    width: 100%;
}

.convert-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
    width: 100%;
}

.convert-btn:hover {
    background-color: #c0392b;
}

/* Footer Styles */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #4a90e2 100%);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 0 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: white;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-section a:hover {
    opacity: 1;
}

.social-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.social-link {
    font-size: 1.5rem;
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
    padding: 0.5rem;
}

.social-link:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Contact Form Styles */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--secondary-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.submit-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
    width: 100%;
}

.submit-btn:hover {
    background-color: #357abd;
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--secondary-color);
}

.menu-toggle:focus {
    outline: none;
}

/* SEO improvements */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        padding: 3rem 1rem;
        margin-left: 0.5rem;
        margin-right: 0.5rem;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .navbar {
        flex-direction: column;
        text-align: center;
        padding: 0.8rem;
    }

    .menu-toggle {
        display: block;
        position: absolute;
        top: 1rem;
        right: 1rem;
    }

    .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 0.5rem;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
        margin-top: 1rem;
    }
    
    .nav-links.active {
        max-height: 250px;
    }

    .nav-links a {
        display: block;
        padding: 0.5rem;
    }

    main {
        padding: 1rem;
        margin-top: 80px;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 1.5rem;
    }

    .social-links {
        justify-content: center;
    }
    
    .contact-content {
        flex-direction: column;
    }
}

/* Contact section improvements */
.contact-content {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
}

.contact-info, .contact-form {
    flex: 1 1 300px;
}

/* Conversion Progress & Success */
.conversion-success {
    padding: 1rem;
    background-color: #d4edda;
    color: #155724;
    border-radius: 5px;
    margin-top: 1rem;
    display: none;
}

/* Animation for upload area */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.upload-area.highlight {
    animation: pulse 1.5s infinite;
}

/* Download button */
.download-btn {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
    width: 100%;
    margin-top: 1rem;
    display: none;
}

.download-btn:hover {
    background-color: #1e2b3a;
}