body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
.card-menu {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    padding: 2.5rem;
    width: 100%;
    max-width: 600px;
    margin: 20px;
}
.btn-doc {
    padding: 1.2rem 2rem;
    font-size: 1.3rem;
    font-weight: 600;
    border-radius: 50px;
    transition: all 0.3s ease;
    margin: 0.7rem 0;
    border: none;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.btn-doc:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.btn-stable {
    background: #28a745;
    color: white;
}
.btn-stable:hover {
    background: #218838;
}
.btn-dev {
    background: #007bff;
    color: white;
}
.btn-dev:hover {
    background: #0069d9;
}
.btn-nightly {
    background: #fd7e14;
    color: white;
}
.btn-nightly:hover {
    background: #dc6c12;
}
.lead {
    color: #333;
    font-weight: 300;
    margin-bottom: 2rem;
    border-bottom: 2px solid #eee;
    padding-bottom: 1rem;
}
.icon-large {
    font-size: 1.8rem;
    vertical-align: middle;
    margin-right: 10px;
}