* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: Arial, sans-serif;
    background: #f0f2f5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}
.container {
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    text-align: center;
    max-width: 600px;
    width: 100%;
}
.logo { font-size: 48px; margin-bottom: 10px; }
h1 { color: #1a1a2e; margin-bottom: 8px; }
.subtitle { color: #666; margin-bottom: 20px; }
.role-grid { display: flex; gap: 20px; margin: 30px 0; flex-wrap: wrap; justify-content: center; }
.role-card {
    background: #f8f9fa;
    padding: 24px;
    border-radius: 12px;
    text-decoration: none;
    color: #333;
    flex: 1;
    min-width: 200px;
    transition: 0.3s;
    border: 2px solid transparent;
}
.role-card:hover { transform: translateY(-4px); box-shadow: 0 8px 25px rgba(0,0,0,0.1); }
.role-card.admin:hover { border-color: #4a6cf7; }
.role-card.teacher:hover { border-color: #28a745; }
.icon { font-size: 32px; display: block; margin-bottom: 10px; }
.badge { display: inline-block; background: #e9ecef; padding: 4px 12px; border-radius: 20px; font-size: 12px; margin-top: 10px; }
.footer-links { margin-top: 20px; font-size: 14px; color: #666; }
.footer-links a { color: #4a6cf7; text-decoration: none; margin: 0 10px; }
.version { margin-top: 20px; font-size: 12px; color: #999; }
.status-badge { display: inline-block; background: #d4edda; color: #155724; padding: 6px 16px; border-radius: 20px; font-size: 14px; margin-bottom: 10px; }
.dot { display: inline-block; width: 8px; height: 8px; background: #28a745; border-radius: 50%; margin-right: 8px; }