/* tools/bode-plot/style.css */
.tool-desc { color: var(--color-text-secondary); font-size: 1.05rem; margin: var(--space-sm) 0 var(--space-lg); }

.bode-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.bode-params {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    position: sticky;
    top: 72px;
}

.param-block { padding: var(--space-md); }
.param-block h3 { margin-bottom: var(--space-md); color: var(--color-primary); font-size: 1.1rem; }

.block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.btn-sm {
    padding: 2px 10px;
    font-size: 0.85rem;
}

.pole-zero-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.pz-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.pz-row input {
    flex: 1;
    padding: 4px 8px;
    font-size: 0.9rem;
}

.pz-row .pz-unit {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    min-width: 24px;
}

.pz-del {
    background: none;
    border: 1.5px solid var(--color-border);
    border-radius: 50%;
    width: 22px;
    height: 22px;
    cursor: pointer;
    font-size: 0.75rem;
    line-height: 1;
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.15s;
}

.pz-del:hover { background: rgba(192,88,58,0.1); }

.pz-type {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    min-width: 36px;
    text-align: right;
}

.preset-btns {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.preset-btns .btn { font-size: 0.9rem; padding: 6px 12px; text-align: left; }

/* 图表 */
.bode-charts { display: flex; flex-direction: column; }

.chart-container {
    padding: var(--space-sm) var(--space-md) var(--space-md);
}

.chart-label {
    font-family: var(--font-title);
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.chart-container canvas {
    width: 100%;
    height: auto;
}

/* 裕度显示 */
.margin-display {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg-paper);
    border: 2px solid var(--color-border-sketch);
    border-radius: var(--radius-md);
}

.margin-item { flex: 1; min-width: 140px; }
.mlabel { display: block; font-size: 0.85rem; color: var(--color-text-muted); }
.mval { display: block; font-family: var(--font-mono); font-size: 1.2rem; color: var(--color-primary); font-weight: 700; }

@media (max-width: 900px) {
    .bode-layout { grid-template-columns: 1fr; }
    .bode-params { position: static; }
}

/* Type-II / Type-III 预设拓扑公式卡 */
.preset-info { margin-top: var(--space-xl); }
.preset-info h3 { color: var(--color-primary); font-size: 1.1rem; margin-bottom: var(--space-md); }
.preset-info-body { display: flex; gap: var(--space-xl); align-items: flex-start; flex-wrap: wrap; }
.preset-info-fig { flex: 0 1 400px; min-width: 280px; }
.preset-info-formulas { flex: 1 1 320px; }
.preset-info-formulas .formula-box { margin: 0 0 var(--space-md); font-size: 0.95rem; line-height: 2; }
.preset-info-formulas .info-box { font-size: 0.9rem; }

.topo-svg { width: 100%; max-width: 400px; height: auto; display: block; margin: 0 auto; }
.topo-svg .tw { stroke: #4a4a4a; stroke-width: 2; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.topo-svg .td { fill: #4a4a4a; }
.topo-svg .tl { font-family: var(--font-hand); font-size: 13px; fill: #4a4a4a; }

/* TF 表达式错误提示 */
#tfMsg.tf-err { color: #c0583a; }

/* 鼠标取点：十字准线覆盖层 + 读数框 */
.bode-plot-wrap { position: relative; }
.bode-plot-wrap canvas { display: block; }
.bode-probe { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.bode-tip {
    position: absolute;
    z-index: 5;
    pointer-events: none;
    background: rgba(255, 252, 247, 0.95);
    border: 1.5px solid var(--color-border-sketch);
    border-radius: var(--radius-sm);
    padding: 3px 8px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text);
    white-space: nowrap;
    box-shadow: 2px 2px 0 rgba(74, 74, 74, 0.15);
}