/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header styles */
header {
    background-color: #fff;
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    border-radius: 5px;
    margin-bottom: 2rem;
}

header h1 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

nav ul {
    list-style: none;
    display: flex;
}

nav ul li {
    margin-right: 1rem;
}

nav ul li a {
    text-decoration: none;
    color: #3498db;
    padding: 0.5rem 1rem;
    border-radius: 3px;
    transition: all 0.3s ease;
}

nav ul li a:hover,
nav ul li a.active {
    background-color: #3498db;
    color: #fff;
}

/* Main content */
main {
    background-color: #fff;
    padding: 2rem;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

/* Hero section */
.hero {
    text-align: center;
    padding: 2rem 0;
}

.hero h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: #7f8c8d;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 3px;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.btn.primary {
    background-color: #3498db;
    color: #fff;
}

.btn.secondary {
    background-color: #2ecc71;
    color: #fff;
}

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

/* Features section */
.features h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #2c3e50;
}

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

.feature-card {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 5px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.feature-card h3 {
    color: #3498db;
    margin-bottom: 1rem;
}

/* Form sections */
.form-section {
    max-width: 500px;
    margin: 0 auto;
}

.form-section h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #2c3e50;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: #2c3e50;
}

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 3px;
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

/* Dashboard sections */
.upload-section,
.files-section,
.preview-section {
    margin-bottom: 2rem;
}

.upload-section h2,
.files-section h2,
.preview-section h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

#filesList {
    min-height: 100px;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem;
    border-bottom: 1px solid #eee;
}

.file-item:last-child {
    border-bottom: none;
}

.file-actions {
    display: flex;
    gap: 0.5rem;
}

#previewContainer {
    min-height: 300px;
    border: 1px solid #ddd;
    border-radius: 3px;
    padding: 1rem;
    background-color: #fff;
}

#previewContainer iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Footer */
footer {
    text-align: center;
    padding: 1rem;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    color: #7f8c8d;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        width: 95%;
    }
    
    nav ul {
        flex-direction: column;
    }
    
    nav ul li {
        margin-right: 0;
        margin-bottom: 0.5rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
}