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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
}

.tagline {
    font-size: 1.3em;
    opacity: 0.95;
    font-weight: 300;
}

/* Navigation */
nav {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    padding: 15px 0;
}

nav li {
    margin: 5px 15px;
}

nav a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

nav a:hover {
    background-color: #667eea;
    color: white;
}

/* Main Content */
main {
    background-color: white;
    margin: 30px auto;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

section {
    margin-bottom: 60px;
}

section:last-child {
    margin-bottom: 0;
}

h2 {
    color: #667eea;
    font-size: 2em;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid #667eea;
}

h3 {
    color: #764ba2;
    font-size: 1.5em;
    margin: 25px 0 15px 0;
}

h4 {
    color: #555;
    font-size: 1.2em;
    margin: 20px 0 10px 0;
}

p {
    margin-bottom: 15px;
}

ul, ol {
    margin-left: 30px;
    margin-bottom: 15px;
}

li {
    margin-bottom: 8px;
}

code {
    background-color: #f4f4f4;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #764ba2;
    text-decoration: underline;
}

/* Feature Boxes */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.feature-box {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.feature-box:hover {
    transform: translateY(-5px);
}

.feature-box h3 {
    color: #667eea;
    margin-top: 0;
}

/* Download Section */
.download-section {
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
    margin: 20px 0;
}

.download-boxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin: 25px 0;
}

.download-box {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    text-align: center;
}

.download-button {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 30px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.1em;
    text-decoration: none;
    margin: 15px 0;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.download-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    text-decoration: none;
}

.file-size {
    color: #666;
    font-size: 0.9em;
    margin-top: 10px;
}

.download-note {
    background-color: #e8eaf6;
    padding: 20px;
    border-radius: 8px;
    margin-top: 25px;
    border-left: 4px solid #667eea;
}

.os-support {
    margin-top: 30px;
    padding: 20px;
    background-color: #fff9e6;
    border-radius: 8px;
    border-left: 4px solid #ffc107;
}

.os-support h3 {
    margin-top: 0;
}

/* Important Notice */
.important {
    background-color: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 15px;
    margin: 20px 0;
    border-radius: 5px;
}

/* Steps */
.steps {
    margin: 30px 0;
}

.step {
    display: flex;
    margin-bottom: 30px;
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.step-number {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    font-weight: bold;
    flex-shrink: 0;
    margin-right: 20px;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    margin-top: 0;
    color: #667eea;
}

/* FAQ Section */
.faq-item {
    background-color: #f8f9fa;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.faq-item h3 {
    color: #333;
    margin-top: 0;
    margin-bottom: 10px;
}

.faq-item p {
    margin-bottom: 10px;
}

/* Footer */
footer {
    background-color: #2d3748;
    color: white;
    padding: 30px 20px;
    text-align: center;
    margin-top: 50px;
}

footer a {
    color: #a0aec0;
    margin: 0 10px;
}

footer a:hover {
    color: white;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    
    .tagline {
        font-size: 1.1em;
    }
    
    main {
        padding: 20px;
        margin: 20px 10px;
    }
    
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    nav li {
        margin: 5px 0;
    }
    
    .step {
        flex-direction: column;
    }
    
    .step-number {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .download-boxes {
        grid-template-columns: 1fr;
    }
}

/* Print Styles */
@media print {
    header {
        background: none;
        color: black;
    }
    
    nav {
        display: none;
    }
    
    .download-button {
        background: none;
        color: black;
        border: 1px solid black;
    }
}