button {
    padding: 0.6rem 1.2rem; border: none; border-radius: 6px;
    font-size: 0.95rem; font-weight: 600;
    cursor: pointer;
    transition: opacity 0.15s;
}
button:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-standard {
    all: unset;
    touch-action: manipulation;
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
    position: relative;
    display: flex;
    flex-flow: row nowrap;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    border-radius: 2px;
    font-weight: 400;
    line-height: 150%;
    letter-spacing: 0%;
    white-space: nowrap;
}

.btn-outline {
    border: 1.5px solid #000000;
    color: #000;
    background-color: var(--content-background-color);
    fill: #000;
}
.btn-outline:hover {
    color: #fff;
    background-color: var(--dark-background-color);
    fill: #fff;
}
.btn-md {
    gap: .5rem;
    height: 3rem;
    padding: 1rem 20px;
    font-size: 16px;
}
.btn-sm {
    gap: .5rem;
    padding: 0.3rem 0.7rem;
    font-size: 0.75rem;
}

.btn-run { background: #00a843; color: #ffffff; }
.btn-stop { background: #cc4444; color: #fff; }
.btn-regular { background: #3a3a5a; color: #e0e0e0; }