/**
 * Componente: Loading Overlay
 * 
 * ESPECIFICIDADE: Nível 2 - Classes com namespace
 * NAMESPACING: Prefixo .loading-*
 * PRIORIDADE: Carregamento #3
 */

/* ===== OVERLAY PRINCIPAL ===== */
.loading {
    /* Layout */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-modal);
    
    /* Visual */
    background: var(--white);
    
    /* Flexbox para centralizar */
    display: flex;
    align-items: center;
    justify-content: center;
    
    /* Transições */
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

/* ===== ESTADOS ===== */
.loading--hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loading--visible {
    opacity: 1;
    visibility: visible;
}

/* ===== SPINNER CONTAINER ===== */
.loading__spinner {
    text-align: center;
    color: var(--dark-gray);
}

/* ===== SPINNER ANIMADO ===== */
.loading__icon {
    /* Tamanho */
    width: 50px;
    height: 50px;
    
    /* Visual */
    border: 4px solid var(--light-gray);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    
    /* Animação */
    animation: loadingSpin 1s linear infinite;
    
    /* Espaçamento */
    margin: 0 auto var(--spacing-md);
}

/* ===== TEXTO DO LOADING ===== */
.loading__text {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--gray);
    margin: 0;
}

/* ===== VARIANTES ===== */
.loading--dark {
    background: rgba(0, 0, 0, 0.8);
}

.loading--dark .loading__text {
    color: var(--white);
}

.loading--dark .loading__icon {
    border-color: rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
}

/* ===== TAMANHOS ===== */
.loading__icon--sm {
    width: 30px;
    height: 30px;
    border-width: 3px;
}

.loading__icon--lg {
    width: 70px;
    height: 70px;
    border-width: 5px;
}

/* ===== ANIMAÇÃO ===== */
@keyframes loadingSpin {
    0% { 
        transform: rotate(0deg); 
    }
    100% { 
        transform: rotate(360deg); 
    }
}

/* ===== RESPONSIVIDADE ===== */
@media (max-width: 576px) {
    .loading__icon {
        width: 40px;
        height: 40px;
    }
    
    .loading__text {
        font-size: var(--font-size-xs);
    }
}