.pert-toolbar {
    display: flex; align-items: center; flex-wrap: wrap;
    gap: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin-bottom: 1.25rem;
}
.pert-unit {
    display: flex; align-items: center; gap: 0.5rem;
}
.pert-unit label {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.pert-select, .pert-input {
    background: rgba(255,255,255,0.05);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    padding: 0.4rem 0.7rem;
    font-family: inherit;
    font-size: 0.85rem;
    outline: none;
    transition: border-color var(--t);
}
.pert-select:focus, .pert-input:focus { border-color: var(--accent); }
.pert-select option { background: #1a1a1a; color: var(--text); padding: 0.4rem; }
.pert-select option:checked, .pert-select option:hover { background: var(--accent); color: #fff; }

.pert-btn-add {
    margin-left: auto;
    display: inline-flex; align-items: center; gap: 0.4rem;
    background: var(--accent);
    color: white;
    border: 0;
    border-radius: 50px;
    padding: 0.5rem 1.1rem;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--t);
}
.pert-btn-add:hover { background: var(--accent-hover); }
.pert-btn-add svg { width: 14px; height: 14px; }

.pert-table-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 1.5rem;
}
.pert-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}
.pert-table th {
    text-align: left;
    padding: 0.75rem 0.9rem;
    background: rgba(255,255,255,0.03);
    border-bottom: 1px solid var(--border);
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 600;
    white-space: nowrap;
}
.pert-table td {
    padding: 0.55rem 0.9rem;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
.pert-table tr:last-child td { border-bottom: 0; }
.pert-table input.pert-input {
    width: 100%;
    padding: 0.4rem 0.5rem;
    font-size: 0.85rem;
}
.pert-table .num {
    width: 90px;
}
.pert-table .num input { text-align: right; font-variant-numeric: tabular-nums; }
.pert-table .calc {
    color: var(--accent);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    text-align: right;
    width: 70px;
}
.pert-table .calc.muted { color: var(--text-muted); font-weight: 400; }

.pert-mini-btn {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    color: var(--text-muted);
    width: 28px; height: 28px;
    border-radius: 50%;
    cursor: pointer;
    display: inline-flex; align-items: center; justify-content: center;
    transition: all var(--t);
}
.pert-mini-btn:hover {
    color: var(--red);
    border-color: rgba(239,68,68,0.4);
    background: rgba(239,68,68,0.08);
}
.pert-mini-btn svg { width: 12px; height: 12px; }

.pert-empty {
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.pert-summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}
@media (max-width: 700px) {
    .pert-summary { grid-template-columns: 1fr; }
}
.pert-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
}
.pert-card h3 {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 1rem;
}
.pert-stat {
    display: flex; justify-content: space-between; align-items: baseline;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}
.pert-stat:last-child { border-bottom: 0; }
.pert-stat .label {
    color: var(--text-secondary);
    font-size: 0.85rem;
}
.pert-stat .value {
    color: var(--text);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    font-size: 1.05rem;
}
.pert-stat .value.accent { color: var(--accent); }
.pert-stat .value.range {
    font-size: 0.92rem;
    color: var(--hl-blue);
}

.pert-card .formula {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    color: var(--text-secondary);
    padding: 0.4rem 0;
    border-bottom: 1px dashed var(--border);
}
.pert-card .formula:last-child { border-bottom: 0; }

.pert-actions {
    display: flex; flex-wrap: wrap; gap: 0.5rem;
}
.pert-action-btn {
    display: inline-flex; align-items: center; gap: 0.45rem;
    padding: 0.55rem 1.1rem;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    color: var(--text);
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--t);
}
.pert-action-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}
.pert-action-btn.danger:hover {
    border-color: rgba(239,68,68,0.4);
    color: var(--red);
    background: rgba(239,68,68,0.08);
}
.pert-action-btn svg { width: 14px; height: 14px; }

@media (max-width: 700px) {
    .pert-table-wrap { overflow-x: auto; }
    .pert-table { min-width: 720px; }
}