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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #ffffff;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* Header - Fixed positioning issue */
.header {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    width: 100%;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo h1 {
    color: #ffffff;
    font-size: 1.5rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.nav a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Add body padding to prevent header overlap */
body {
    padding-top: 80px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0;
    color: #ffffff;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #ffeaa7, #fdcb6e);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    color: #ffffff;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.hero-divider {
    width: 100px;
    height: 4px;
    background: linear-gradient(135deg, #ffeaa7, #fdcb6e);
    margin: 0 auto 2rem;
    border-radius: 2px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #f0f4ff;
    line-height: 1.8;
    max-width: 600px;
    margin: 0 auto;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* Converter Section */
.converter-section {
    padding: 4rem 0;
}

.upload-area {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    border: 2px dashed rgba(255, 255, 255, 0.4);
    border-radius: 24px;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 2rem;
}

.upload-area:hover, .upload-area.drag-over {
    border-color: #ffeaa7;
    background: rgba(255, 234, 167, 0.2);
    transform: scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.upload-content h3 {
    color: #ffffff;
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.upload-content p {
    color: #f0f4ff;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.browse-text {
    color: #ffeaa7;
    font-weight: 700;
    text-decoration: underline;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.upload-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: #ffffff;
    transition: all 0.3s ease;
}

.upload-area:hover .upload-icon {
    background: rgba(255, 234, 167, 0.3);
    transform: scale(1.1);
}

.supported-formats {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.15);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    color: #f0f4ff;
    font-size: 0.9rem;
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* Conversion Controls */
.conversion-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    margin-bottom: 2rem;
}

.format-selector label {
    display: block;
    color: #ffffff;
    font-weight: 700;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.format-select {
    width: 100%;
    padding: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    color: #ffffff;
    font-size: 1rem;
    font-weight: 600;
    outline: none;
    transition: all 0.3s ease;
}

.format-select:focus {
    border-color: #ffeaa7;
    box-shadow: 0 0 0 3px rgba(255, 234, 167, 0.3);
}

.format-select option {
    background: #2d3748;
    color: #ffffff;
    padding: 0.5rem;
    font-weight: 600;
}

.convert-btn {
    background: linear-gradient(135deg, #ffeaa7, #fdcb6e);
    color: #ffffff;
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.convert-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.25);
}

.convert-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Image Preview */
.image-preview {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    margin-bottom: 2rem;
}

.image-preview h3 {
    color: #ffffff;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.preview-item {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    padding: 1rem;
    text-align: center;
    transition: all 0.3s ease;
}

.preview-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.preview-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

.preview-item .file-name {
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 600;
    word-break: break-all;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* Download Section */
.download-section {
    text-align: center;
}

.download-all-btn {
    background: linear-gradient(135deg, #00b894, #00a085);
    color: #ffffff;
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.download-all-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.25);
}

/* Features Section */
.features-section {
    padding: 4rem 0;
    background: rgba(255, 255, 255, 0.08);
}

.section-title {
    text-align: center;
    color: #ffffff;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.section-subtitle {
    text-align: center;
    color: #f0f4ff;
    font-size: 1.2rem;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
    background: rgba(255, 255, 255, 0.2);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-card h3 {
    color: #ffffff;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.feature-card p {
    color: #f0f4ff;
    line-height: 1.6;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* Formats Section */
.formats-section {
    padding: 4rem 0;
}

.formats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.format-item {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 1.5rem 1rem;
    border-radius: 16px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
}

.format-item:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-5px);
}

.format-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.5rem;
}

.format-name {
    color: #ffffff;
    font-weight: 700;
    font-size: 0.9rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* Content Section */
.content-section {
    padding: 4rem 0;
    background: rgba(255, 255, 255, 0.08);
}

.content-grid {
    display: grid;
    gap: 3rem;
    margin-bottom: 4rem;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.content-article {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.content-article h3 {
    color: #ffffff;
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.content-article h4 {
    color: #ffeaa7;
    font-size: 1.3rem;
    font-weight: 700;
    margin: 2rem 0 1rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.content-article p {
    color: #f0f4ff;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.3);
    padding: 3rem 0 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

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

.footer-section h4 {
    color: #ffffff;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.footer-section p {
    color: #f0f4ff;
    line-height: 1.6;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

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

.footer-section ul li {
    color: #f0f4ff;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-bottom p {
    color: #f0f4ff;
    font-size: 0.9rem;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #ffffff;
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding-top: 70px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .header .container {
        flex-direction: column;
        text-align: center;
        padding: 0.8rem 20px;
    }
    
    .upload-area {
        padding: 2rem 1rem;
    }
    
    .conversion-controls {
        flex-direction: column;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .formats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .content-article {
        padding: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    body {
        padding-top: 60px;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .upload-area {
        padding: 1.5rem 1rem;
    }
    
    .formats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .preview-grid {
        grid-template-columns: 1fr;
    }
    
    .header .container {
        padding: 0.6rem 15px;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
button:focus,
select:focus,
input:focus {
    outline: 2px solid #ffeaa7;
    outline-offset: 2px;
}