#diagram-container {
    margin: 40px auto;
    display: flex;
    position: relative; 
    justify-content: center; 
    gap: 150px; 
    max-width: 1200px;
}

#tabelas-unidades, #tabelas-valores {
    min-width: 200px; 
    display: flex;
    flex-direction: column;
    z-index: 5; 
}

#conversion-arrows {
    position: absolute;
    top: 55px; 
    left: 50%;
    transform: translateX(-50%); 
    width: 150px; 
    height: calc(100% - 55px);
    pointer-events: none;
    z-index: 10;
}

.step-arrow {
    position: absolute;
    width: 100%;
    height: 50px;
    font-weight: 800;
    transition: all 0.4s ease;
}

.operation-text {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    display: flex; 
    align-items: center; 
    white-space: nowrap;
    font-size: 1rem;
}

.divide-arrow { 
    left: 0; 
    color: #d9534f; 
    justify-content: flex-start;
}

.multiply-arrow { 
    right: 0; 
    color: var(--primary-green); 
    flex-direction: row-reverse;
    justify-content: flex-start;
}

.arrow-symbol {
    font-size: 1.6rem;
    padding: 0 8px;
}

.arrow-hidden { opacity: 0 !important; }

.header-box, .unit-box, .value-box {
    padding: 12px 20px;
    height: 55px;
    line-height: 30px;
    margin: 6px 0; 
    box-sizing: border-box;
    font-weight: 700;
    display: flex;
    align-items: center;
}

.header-box { 
    background-color: var(--primary-green); 
    color: white; 
    border-radius: 10px 10px 0 0; 
    justify-content: center;
    font-size: 1.2rem;
}

.unit-box { 
    background-color: var(--light-green); 
    border: 2px solid var(--primary-green); 
    border-radius: 8px; 
    justify-content: center;
    color: var(--text-dark);
    font-size: 1.1rem;
}

.value-box { 
    background-color: #f8f9fa; 
    border: 1px solid #ddd; 
    text-align: right; 
    font-family: 'Courier New', Courier, monospace; 
    font-size: 1.3rem;
    border-radius: 8px; 
    justify-content: flex-end;
}

.highlight-from, .highlight-to {
    box-shadow: 0 0 15px var(--warning-orange);
    background-color: var(--accent-yellow) !important;
    border-color: var(--warning-orange) !important;
}

.highlight-current {
    background-color: var(--warning-orange) !important; 
    color: white !important;
}

.nav.btn-step, .nav.btn-restart, .btn-nav-main {
    border: none;
    border-radius: 50px !important;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.btn-nav-main { background-color: var(--primary-green) !important; color: white !important; padding: 15px 35px; }
.btn-step { background-color: var(--warning-orange) !important; color: white !important; }
.btn-restart { background-color: var(--light-green) !important; color: var(--primary-green) !important; }

.nav:hover:not(:disabled) { 
    transform: translateY(-4px); 
    box-shadow: 0 8px 20px rgba(0,0,0,0.15); 
}

#conversion-navigation button:disabled {
    background-color: #e0e0e0 !important;
    color: #a0a0a0 !important;
    cursor: not-allowed;
    opacity: 0.7;
    box-shadow: none;
}
@media (max-width: 768px) {
    #diagram-container {
        gap: 60px; 
        margin: 20px auto;
    }

    #tabelas-unidades, #tabelas-valores {
        min-width: 100px; 
    }

    #conversion-arrows {
        width: 60px; 
        top: 45px;
    }

    .header-box, .unit-box, .value-box {
        padding: 8px 10px;
        height: 45px;
        font-size: 0.9rem;
    }

    .value-box { font-size: 1rem; }

    .operation-text {
        font-size: 0.7rem;
        width: 50px;
    }

    .arrow-symbol {
        font-size: 1.1rem;
    }
}