.k-calc-container {
    background: var(--bg-panel);
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    padding: 12px;
    box-sizing: border-box;
    border: 2px solid var(--k-white);
    border-right-color: var(--k-gray-shadow);
    border-bottom-color: var(--k-gray-shadow);
    gap: 12px;
    font-family: var(--font-main);
    overflow-y: auto; /* Scroll para mobile */
}

.k-calc-display {
    background: #8da075;
    border: 4px inset var(--k-gray-shadow);
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 12px;
    box-shadow: inset 3px 3px 10px rgba(0,0,0,0.4);
    flex-shrink: 0;
    font-family: 'Courier New', monospace;
    font-size: 32px;
    font-weight: bold;
    color: #1a1a1a;
    border-radius: 2px;
}

.k-calc-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    flex-grow: 1;
    min-height: 320px; /* Garante tamanho mínimo no mobile */
}

.k-calc-btn {
    font-family: var(--font-main);
    font-size: 18px;
    font-weight: bold;
    border: 2px solid var(--k-black);
    border-radius: 3px;
    cursor: pointer;
    min-height: 50px;
    box-shadow: 2px 2px 0 var(--k-black);
    transition: transform 0.05s;
}

.k-calc-btn:active {
    transform: translate(1px, 1px);
    box-shadow: none;
}

.k-calc-btn-num {
    background: var(--k-white);
    color: var(--k-black);
}

.k-calc-btn-op {
    background: var(--k-black);
    color: var(--k-white);
}

.k-calc-footer {
    font-size: 9px;
    text-align: center;
    color: #444;
    border-top: 1px solid var(--k-black);
    padding-top: 6px;
    flex-shrink: 0;
}

/* Estilo do Segredo Ativado */
.k-calc-secret {
    background: #0a0000;
    color: #00ff41;
    height: 100%;
    padding: 25px;
    display: flex;
    flex-direction: column;
    text-align: center;
    border: 4px solid #00ff41;
    box-sizing: border-box;
    font-family: monospace;
}