body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
    padding-top: 80px; /* Hely a fix navbar alá */
}

/* Navbar alapstílusok */
.navbar {
    background-color: #343a40 !important;
    border-bottom: 2px solid #495057;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1030;
    min-height: 70px;
}

.navbar-brand {
    color: #ffffff !important;
    font-weight: 500;
    text-decoration: none;
}

.navbar-brand:hover {
    color: #ffc107 !important;
}

/* Hamburger menü */
.navbar-toggler {
    border: 1px solid #ffffff;
    padding: 4px 8px;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 0.2rem rgba(255, 255, 255, 0.25);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Navigációs linkek */
.navbar-nav .nav-link {
    color: #ffffff !important;
    transition: color 0.3s ease;
    padding: 0.5rem 1rem;
}

.navbar-nav .nav-link:hover {
    color: #ffc107 !important;
}

.nav-link {
    color: #ffffff;
}

.nav-link:hover {
    color: #e0e0e0;
}

/* Responsive beállítások */
@media (max-width: 991.98px) {
    .navbar-nav {
        padding-top: 1rem;
        border-top: 1px solid #495057;
        margin-top: 1rem;
    }
    
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem;
        border-bottom: 1px solid #495057;
    }
    
    .navbar-nav .nav-link:last-child {
        border-bottom: none;
    }
    
    .navbar-brand span {
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    body {
        padding-top: 70px;
    }
    
    .navbar-brand span {
        font-size: 0.9rem;
    }
    
    .container {
        margin-top: 10px;
        padding: 0 10px;
    }
}

.container {
    margin-top: 20px;
}

.card {
    margin-bottom: 20px;
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-radius: 8px;
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid #e9ecef;
}

/* Responsive kártya layout */
@media (max-width: 768px) {
    .card {
        margin-bottom: 15px;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .card-title {
        font-size: 1.1rem;
    }
    
    .btn {
        font-size: 0.9rem;
        padding: 0.5rem 0.75rem;
    }
    
    .badge {
        font-size: 0.75rem;
    }
}

/* Device card responsive layout */
@media (max-width: 576px) {
    .col-md-4 {
        margin-bottom: 1rem;
    }
    
    .card-img-top {
        height: 150px !important;
    }
    
    .relay-btn {
        font-size: 0.85rem;
        padding: 0.4rem 0.6rem;
    }
    
    .d-grid.gap-2 {
        gap: 0.5rem !important;
    }
}

/* Heartbeat signal and quality styling */
.heartbeat-signal {
    font-size: 0.75rem;
}

.heartbeat-quality {
    font-size: 0.75rem;
}

.heartbeat-timestamp {
    font-size: 0.8rem;
}

.footer {
    background-color: #f8f9fa;
    padding: 20px;
    text-align: center;
}

h1, h2, h3 {
    color: #343a40;
}

.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
    border-radius: 6px;
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

.btn {
    border-radius: 6px;
}

.badge {
    font-size: 0.85em;
}

#topics-list .list-group-item {
    border: none;
    padding: 0.75rem 0;
    border-bottom: 1px solid #e9ecef;
}

#topics-list .list-group-item:last-child {
    border-bottom: none;
}

.relay-btn {
    transition: all 0.2s ease;
}

.relay-btn:hover {
    transform: translateY(-1px);
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');