body {
    background-color: #f8f9fa;
}

#app {
    max-width: 800px;
    margin: auto;
}

.timer-display-card {
    background-color: #ffffff;
    border: 1px solid #dee2e6;
}

.display-1 {
    font-size: 5rem;
    letter-spacing: 2px;
}

.interval-row {
    background-color: #fff;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.25rem;
}

.form-floating > label {
    font-size: 0.9rem;
    padding-top: 0.6rem;
}

.progress-bar {
    transition: width 0.2s ease-in-out;
}