/* Beam Displacement Calculator — tool styles.
   Follows the two-column tech-tools layout: input/results card on left,
   virtual-3D view on right. Yellow/black branding, black 3D background. */

.beam-displacement-tool {
    --bd-yellow: #ffd400;
    --bd-black: #231f20;
    --bd-ink: #231f20;
    --bd-line: #d9dce0;
    --bd-muted: #6b7178;
    display: flex;
    flex-wrap: wrap;
    gap: 28px;
    align-items: stretch;
    font-family: "Source Sans Pro", Arial, sans-serif;
    color: var(--bd-ink);
}

.beam-displacement-tool .bd-panel {
    flex: 1 1 320px;
    min-width: 300px;
    border: 1px solid var(--bd-line);
    border-radius: 6px;
    padding: 22px 24px;
    background: #fff;
}

.beam-displacement-tool .bd-visual {
    flex: 1 1 420px;
    min-width: 320px;
    border: 1px solid var(--bd-line);
    border-radius: 6px;
    overflow: hidden;
    background: #000;
    position: relative;
}

.beam-displacement-tool #bd-view {
    width: 100%;
    height: 440px;
    cursor: grab;
    background: #000;
}

.beam-displacement-tool #bd-view:active { cursor: grabbing; }

.beam-displacement-tool .bd-visual-hint {
    position: absolute;
    left: 12px;
    bottom: 10px;
    font-size: 12px;
    color: #aab2bd;
    pointer-events: none;
}

.beam-displacement-tool .bd-field {
    margin-bottom: 16px;
}

.beam-displacement-tool .bd-field label {
    display: block;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 6px;
    color: var(--bd-ink);
}

.beam-displacement-tool .bd-field .bd-unit {
    color: var(--bd-muted);
    font-weight: 400;
}

.beam-displacement-tool input[type="number"] {
    width: 100%;
    box-sizing: border-box;
    padding: 9px 11px;
    border: 1px solid var(--bd-line);
    border-radius: 4px;
    font-size: 15px;
    color: var(--bd-ink);
}

.beam-displacement-tool .bd-error {
    display: none;
    margin: 12px 0 0;
    padding: 10px 12px;
    background: #fff6d6;
    border: 1px solid var(--bd-yellow);
    border-left: 4px solid var(--bd-black);
    border-radius: 4px;
    color: #3d3000;
    font-size: 14px;
}

.beam-displacement-tool .bd-results {
    margin-top: 22px;
    border-top: 1px solid var(--bd-line);
    padding-top: 18px;
}

.beam-displacement-tool .bd-result-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 12px;
}

.beam-displacement-tool .bd-result-row .bd-result-label {
    font-size: 14px;
    color: var(--bd-muted);
}

.beam-displacement-tool .bd-result-row .bd-result-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--bd-black);
}

.bd-notes {
    margin-top: 22px;
    font-family: "Source Sans Pro", Arial, sans-serif;
    font-size: 14px;
    color: var(--bd-ink);
}

.bd-notes strong { font-style: italic; }

.bd-notes ul {
    margin: 8px 0 0;
    padding-left: 20px;
}

.bd-notes li { margin-bottom: 6px; }

@media (max-width: 720px) {
    .beam-displacement-tool { flex-direction: column; }
    .beam-displacement-tool #bd-view { height: 340px; }
}