body:has(> .lab-topbar) {
    padding-top: 0;
}

.lab-topbar {
    display: flex;
    align-items: center;
    gap: 16px;
    width: 100%;
    padding: 12px 20px;
    background: #161b22;
    border-bottom: 1px solid #30363d;
    box-sizing: border-box;
    flex-shrink: 0;
}

.lab-topbar__back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: 6px;
    background: #1f6feb;
    color: #fff;
    text-decoration: none;
    font-size: 0.84rem;
    font-weight: 600;
    white-space: nowrap;
    transition: background 0.15s;
}

.lab-topbar__back:hover {
    background: #388bfd;
    color: #fff;
}

.lab-topbar__title {
    font-size: 0.9rem;
    font-weight: 600;
    color: #e6edf3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.lab-topbar__brand {
    margin-left: auto;
    font-size: 0.82rem;
    font-weight: 600;
    color: #58a6ff;
    white-space: nowrap;
}

body.lab-shell {
    margin: 0;
    min-height: 100vh;
    background: #0d1117;
    color: #c9d1d9;
    font-family: 'Segoe UI', 'Noto Sans KR', sans-serif;
    display: flex;
    flex-direction: column;
}

.lab-shell__content {
    flex: 1;
    padding: 24px 20px 40px;
    font-size: 0.95rem;
    line-height: 1.6;
}

.lab-shell__content pre {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
}