* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Roboto, Arial, sans-serif;
}
body {
    color: #333;
    line-height: 1.7;
    background-color: #fff;
}
.header {
    background: #1f2937;
    color: white;
    padding: 2.5rem 1rem;
    text-align: center;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}
.cta-section {
    background: #f3f4f6;
    padding: 3rem 1.5rem;
    text-align: center;
    margin: 2rem 0;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.btn {
    display: inline-block;
    padding: 1rem 2.2rem;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    margin: 0.6rem;
    font-size: 1rem;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
}
.btn-primary {
    background: #2563eb;
    color: white;
}
.btn-primary:hover {
    background: #1d4ed8;
}
.btn-secondary {
    background: #059669;
    color: white;
}
.btn-secondary:hover {
    background: #047857;
}
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.8rem;
    margin: 3.5rem 0;
}
.feature-card {
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    padding: 2rem;
    transition: transform 0.2s;
}
.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.feature-card h3 {
    color: #1f2937;
    margin-bottom: 1rem;
    font-size: 1.4rem;
}
.feature-card p {
    color: #4b5563;
}
.how-to {
    margin: 4.5rem 0;
}
.how-to h2 {
    text-align: center;
    color: #1f2937;
    margin-bottom: 2rem;
    font-size: 2.1rem;
}
.step-desc {
    text-align: center;
    max-width: 900px;
    margin: 0 auto 2.5rem;
    color: #4b5563;
}
.step-card {
    margin: 1.6rem 0;
    padding: 1.6rem;
    border-left: 5px solid #2563eb;
    background: #f9fafb;
    border-radius: 0 8px 8px 0;
}
.step-card h4 {
    color: #2563eb;
    margin-bottom: 0.6rem;
    font-size: 1.2rem;
}
.step-card ul {
    margin-left: 2rem;
    margin-top: 0.6rem;
    color: #4b5563;
}
.faq-section {
    margin: 5rem 0;
}
.faq-section h2 {
    text-align: center;
    color: #1f2937;
    margin-bottom: 2.5rem;
    font-size: 2.1rem;
}
.faq {
    margin: 1.2rem 0;
    padding: 1.2rem;
    border-bottom: 1px solid #e5e7eb;
}
.faq h3 {
    color: #2563eb;
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
}
.faq p {
    color: #4b5563;
}
.download-section {
    background: #1f2937;
    color: white;
    padding: 3.5rem 1rem;
    text-align: center;
    margin: 4rem 0;
    border-radius: 10px;
}
.download-section h2 {
    margin-bottom: 1rem;
    font-size: 2rem;
}
.os-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin: 2.2rem 0;
}
.os-btn {
    background: white;
    color: #1f2937;
    padding: 1.1rem 1.8rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
}
.os-btn:hover {
    background: #e5e7eb;
}
.highlight {
    color: #2563eb;
    font-weight: 600;
}
.footer {
    background: #111827;
    color: #d1d5db;
    text-align: center;
    padding: 2.5rem 1rem;
    margin-top: 1rem;
}
.footer  a{
    color: #d1d5db;
}
.footer p {
    margin: 0.5rem 0;
}