/**
 * MFA Theme - Preloader Styles
 * Tres tipos de animacao: spin, pulse, bar
 * GPU-accelerated, responsive, acessivel
 */

/* ==========================================================================
   BASE STYLES
   ========================================================================== */

#mfa-preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999999;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    /* Fallback background - CSS custom property sobrescreve */
    background-color: rgba(255, 255, 255, 0.98);
    background-color: var(--preloader-bg, rgba(255, 255, 255, 0.98));
    /* Backdrop blur para efeito moderno */
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    /* Transicao suave de saida */
    transition: opacity 0.5s ease-out;
    /* GPU acceleration */
    will-change: opacity;
    transform: translateZ(0);
}

/* Loader container */
.mfa-preloader-loader {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Imagem customizada */
.mfa-preloader-image {
    max-width: 120px;
    max-height: 120px;
    width: auto;
    height: auto;
    object-fit: contain;
}

/* ==========================================================================
   ANIMACAO: SPIN (loader circular)
   ========================================================================== */

.mfa-preloader-spin {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-top-color: var(--preloader-color, #0073aa);
    border-radius: 50%;
    animation: mfa-spin 0.8s linear infinite;
    will-change: transform;
}

@keyframes mfa-spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* ==========================================================================
   ANIMACAO: PULSE (pontos pulsantes)
   ========================================================================== */

.mfa-preloader-pulse {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.mfa-preloader-pulse span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--preloader-color, #0073aa);
    animation: mfa-pulse 1.4s ease-in-out infinite both;
    will-change: transform, opacity;
}

.mfa-preloader-pulse span:nth-child(1) {
    animation-delay: -0.32s;
}

.mfa-preloader-pulse span:nth-child(2) {
    animation-delay: -0.16s;
}

.mfa-preloader-pulse span:nth-child(3) {
    animation-delay: 0s;
}

@keyframes mfa-pulse {
    0%, 80%, 100% {
        transform: scale(0.6);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* ==========================================================================
   ANIMACAO: BAR (barra de progresso)
   ========================================================================== */

.mfa-preloader-bar {
    width: 200px;
    height: 4px;
    background-color: rgba(0, 0, 0, 0.1);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
}

.mfa-preloader-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 40%;
    height: 100%;
    background-color: var(--preloader-color, #0073aa);
    border-radius: 2px;
    animation: mfa-bar 1.5s ease-in-out infinite;
    will-change: transform;
}

@keyframes mfa-bar {
    0% {
        transform: translateX(-100%);
    }
    50% {
        transform: translateX(150%);
    }
    100% {
        transform: translateX(400%);
    }
}

/* ==========================================================================
   TEXTO OPCIONAL
   ========================================================================== */

.mfa-preloader-text {
    margin-top: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--preloader-color, #333);
    opacity: 0.8;
    text-align: center;
    max-width: 80%;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

@media (max-width: 768px) {
    .mfa-preloader-spin {
        width: 40px;
        height: 40px;
        border-width: 3px;
    }

    .mfa-preloader-pulse span {
        width: 10px;
        height: 10px;
    }

    .mfa-preloader-bar {
        width: 150px;
    }

    .mfa-preloader-image {
        max-width: 80px;
        max-height: 80px;
    }

    .mfa-preloader-text {
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .mfa-preloader-spin {
        width: 35px;
        height: 35px;
    }

    .mfa-preloader-pulse span {
        width: 8px;
        height: 8px;
        gap: 6px;
    }

    .mfa-preloader-bar {
        width: 120px;
    }

    .mfa-preloader-image {
        max-width: 60px;
        max-height: 60px;
    }
}

/* ==========================================================================
   ACESSIBILIDADE
   ========================================================================== */

/* Respeita preferencia de reduced motion */
@media (prefers-reduced-motion: reduce) {
    .mfa-preloader-spin,
    .mfa-preloader-pulse span,
    .mfa-preloader-bar::after {
        animation: none;
    }

    .mfa-preloader-spin {
        border-top-color: var(--preloader-color, #0073aa);
        opacity: 0.7;
    }

    .mfa-preloader-pulse span {
        opacity: 0.7;
    }

    .mfa-preloader-bar::after {
        width: 60%;
        transform: translateX(35%);
    }

    #mfa-preloader {
        transition: none;
    }
}

/* Print - esconde preloader */
@media print {
    #mfa-preloader {
        display: none !important;
    }
}

/* ==========================================================================
   DARK MODE SUPPORT
   ========================================================================== */

@media (prefers-color-scheme: dark) {
    #mfa-preloader {
        /* Usa cor definida ou fallback escuro */
        background-color: var(--preloader-bg, rgba(30, 30, 30, 0.98));
    }

    .mfa-preloader-bar {
        background-color: rgba(255, 255, 255, 0.1);
    }

    .mfa-preloader-spin {
        border-color: rgba(255, 255, 255, 0.1);
    }
}