.fl-prompt {
    font-size: 1.2rem;
    font-weight: 600;
    color: #444;
    text-align: center;
    margin: 0.5rem 0 0.8rem;
}

.fl-display {
    display: flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    margin: 0.6rem auto 1rem;
    padding: 0.7rem 1.2rem;
    font-size: 2.6rem;
    color: #1e293b;
    background: #f1f5f9;
    border: 3px solid #cbd5e1;
    border-radius: 16px;
}

.fl-line-wrap {
    overflow-x: auto;
    width: 100%;
    padding: 0.4rem 0 0.2rem;
    margin: 0.4rem 0 0.6rem;
}

.fl-svg {
    display: block;
    margin: 0 auto;
}

.fl-clickable {
    cursor: pointer;
}

.fl-axis {
    stroke: #475569;
    stroke-width: 1.4;
}

.fl-arrow {
    fill: #475569;
}

.fl-tick {
    stroke: #94a3b8;
    stroke-width: 0.9;
}

.fl-tick-major {
    stroke: #475569;
    stroke-width: 1.4;
}

.fl-tick-zero {
    stroke: #e2574c;
    stroke-width: 1.4;
}

.fl-label {
    fill: #334155;
    font-size: 14px;
    font-weight: 700;
}

.fl-label-zero {
    fill: #1f3a5f;
    font-weight: 800;
}

.fl-marker,
.fl-marker-dot {
    fill: #e2574c;
}

.fl-marker-stem {
    stroke: #e2574c;
    stroke-width: 1.2;
}

.fl-options {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin: 0.8rem 0;
}

.fl-option {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 4.5rem;
    padding: 0.6rem 1rem;
    font-size: 1.6rem;
    font-weight: 700;
    color: #1e293b;
    background: #ffffff;
    border: 2px solid #cbd5e1;
    border-radius: 14px;
    cursor: pointer;
    transition: transform 0.1s ease, border-color 0.1s ease;
}

.fl-option:hover {
    transform: scale(1.05);
    border-color: #94a3b8;
}

.fl-mixed {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.fl-whole {
    font-weight: 700;
}

.fl-hint {
    text-align: left;
}

.fl-hint p {
    margin: 0.35rem 0;
}