.kls-demo {
    margin: 2rem 0;
    padding: clamp(1rem, 4vw, 1.75rem);
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--sidebar);
    color: var(--ink);
}

.kls-demo .kls-demo-label {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
}

.kls-demo .kls-flat-figure {
    margin: 1.25rem 0;
}

.kls-demo svg {
    display: block;
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
    border-radius: 8px;
    background: #fffdf8;
}

.kls-demo .kls-help,
.kls-demo figcaption {
    margin: 0.6rem 0 1rem;
    font-size: 0.85rem;
    line-height: 1.7;
    color: var(--muted);
}

.kls-demo label {
    display: block;
    margin-top: 1rem;
    font-size: 0.95rem;
    font-weight: 600;
}

.kls-demo output {
    margin-left: 0.5rem;
    font-variant-numeric: tabular-nums;
}

.kls-demo input[type="range"] {
    display: block;
    width: 100%;
    min-height: 44px;
    accent-color: #3976c7;
}

.kls-demo .kls-button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}

.kls-demo button {
    max-width: 100%;
    min-height: 44px;
    padding: 0.65rem 0.9rem;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--surface);
    color: var(--ink);
    line-height: 1.5;
    text-align: left;
}

.kls-demo button:hover {
    border-color: var(--muted);
}

.kls-demo .kls-result {
    margin: 1.25rem 0 0;
    padding: 0.9rem;
    border-radius: 6px;
    background: var(--surface);
    font-size: 0.95rem;
    font-variant-numeric: tabular-nums;
}

.kls-demo .kls-three-viewport {
    width: 100%;
    height: clamp(240px, 55vw, 360px);
    margin-top: 1rem;
    overflow: hidden;
    border-radius: 8px;
    background: #fffdf8;
}

.kls-demo canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.kls-explainer {
    padding: clamp(1rem, 4vw, 1.5rem);
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--sidebar);
}

.kls-diagram-panels,
.kls-bound-cases {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
}

.kls-diagram-panel {
    flex: 1 1 240px;
    min-width: 0;
}

.kls-explainer .kls-diagram-heading {
    margin: 0 0 0.75rem;
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.6;
}

.kls-diagram-panel svg {
    display: block;
    width: 100%;
    max-width: 360px;
    margin: 0 auto;
    border-radius: 6px;
    background: #fffdf8;
}

.kls-explainer .kls-diagram-note,
.article-body .kls-explainer figcaption {
    margin: 0.75rem 0 0;
    font-size: 0.85rem;
    line-height: 1.8;
    color: var(--muted);
}

.kls-bound-diagram {
    padding: 1rem;
    border-radius: 6px;
    background: #fffdf8;
    color: #244b3f;
    text-align: center;
}

.kls-bound-diagram .kls-bound-ceiling {
    margin: 0;
    padding-bottom: 0.65rem;
    border-bottom: 4px solid #215eb0;
    color: #215eb0;
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.6;
}

.kls-bound-cases {
    gap: 0.5rem;
}

.kls-bound-case {
    flex: 1 1 90px;
    min-width: 0;
}

.kls-bound-case svg {
    display: block;
    width: 60px;
    height: 60px;
    margin: 0 auto;
}

.kls-bound-case p {
    margin: 0;
    padding: 0.4rem;
    border-radius: 4px;
    background: #c5e5d9;
    font-size: 0.9rem;
    line-height: 1.6;
}

.kls-bound-diagram .kls-bound-message {
    margin: 1rem 0 0;
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.7;
}

@media print {
    .kls-demo .kls-controls,
    #kls-three-controls,
    #kls-three-panel {
        display: none;
    }
}