.ytb-uuidgen-header {
    background: #1976D2;
    color: #fff;
    font-size: 22px;
    font-weight: 700;
    padding: 16px 20px;
    border-radius: 8px 8px 0 0;
}

.ytb-uuidgen-card {
    background: #fff;
    border: 1px solid #E0E0E0;
    border-top: none;
    border-radius: 0 0 8px 8px;
    padding: 20px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
    margin-bottom: 8px;
}

.ytb-uuidgen-options {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 22px;
    font-size: 14px;
    color: #333;
}
.ytb-uuidgen-options select {
    margin-left: 6px;
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid #CFD8DC;
}
.ytb-uuidgen-checkbox {
    display: flex;
    align-items: center;
    gap: 6px;
}

.ytb-uuidgen-count-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}
.ytb-uuidgen-count-row input[type="number"] {
    width: 90px;
    padding: 8px 10px;
    border: 1px solid #CFD8DC;
    border-radius: 6px;
}

.ytb-uuidgen-btn {
    background: #43A047;
    color: #fff;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}
.ytb-uuidgen-btn:hover { background: #388E3C; }
.ytb-uuidgen-btn.secondary {
    background: #ECEFF1;
    color: #263238;
}
.ytb-uuidgen-btn.secondary:hover { background: #CFD8DC; }

.ytb-uuidgen-output {
    width: 100%;
    min-height: 220px;
    margin-top: 16px;
    padding: 12px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 13.5px;
    line-height: 1.8;
    border: 1px solid #CFD8DC;
    border-radius: 6px;
    background: #FAFAFA;
    resize: vertical;
    box-sizing: border-box;
}

.ytb-uuidgen-count-display {
    margin-top: 8px;
    font-size: 13px;
    color: #616161;
}

@media (max-width: 640px) {
    .ytb-uuidgen-count-row { flex-direction: column; align-items: stretch; }
    .ytb-uuidgen-btn { width: 100%; }
}