/**
 * Sistema de Loading Moderno 2024
 * Animações fluidas e micro-interações contemporâneas
 */

/* ========================================
   OVERLAY PRINCIPAL
======================================== */

.loading-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    
    /* Glassmorphism backdrop */
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    
    /* Flexbox centralizado */
    display: flex;
    align-items: center;
    justify-content: center;
    
    /* Estados de transição */
    opacity: 0;
    visibility: hidden;
    transform: scale(1.05);
    
    /* Transições suaves */
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

/* ========================================
   CONTAINER DO LOADING
======================================== */

.loading-container {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-3xl);
    box-shadow: 
        0 32px 64px -12px rgba(0, 0, 0, 0.25),
        0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    
    padding: var(--space-8);
    min-width: 320px;
    max-width: 400px;
    text-align: center;
    
    /* Animação de entrada */
    transform: translateY(20px) scale(0.9);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.loading-overlay.active .loading-container {
    transform: translateY(0) scale(1);
}

/* ========================================
   SPINNERS MODERNOS
======================================== */

/* Spinner Principal - Múltiplos Anéis */
.loading-spinner {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-6);
    position: relative;
    display: inline-block;
}

.loading-spinner::before,
.loading-spinner::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    animation-duration: 1.5s;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
    animation-play-state: running;
}

/* Anel externo */
.loading-spinner::before {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 3px solid transparent;
    border-top: 3px solid var(--primary-500);
    border-right: 3px solid var(--primary-300);
    animation-name: spinClockwise;
    animation-duration: 1.2s;
}

/* Anel interno */
.loading-spinner::after {
    top: 8px;
    left: 8px;
    width: calc(100% - 16px);
    height: calc(100% - 16px);
    border: 2px solid transparent;
    border-bottom: 2px solid var(--primary-600);
    border-left: 2px solid var(--primary-400);
    animation-name: spinCounterClockwise;
    animation-duration: 1.8s;
}

@keyframes spinClockwise {
    0% { 
        transform: rotate(0deg); 
        opacity: 0.8;
    }
    50% {
        opacity: 1;
    }
    100% { 
        transform: rotate(360deg); 
        opacity: 0.8;
    }
}

@keyframes spinCounterClockwise {
    0% { 
        transform: rotate(360deg); 
        opacity: 0.6;
    }
    50% {
        opacity: 1;
    }
    100% { 
        transform: rotate(0deg); 
        opacity: 0.6;
    }
}

/* Spinner Alternativo - Pulso Orbital */
.loading-spinner.pulse-orbital {
    width: 60px;
    height: 60px;
}

.loading-spinner.pulse-orbital::before {
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, var(--primary-500) 30%, transparent 70%);
    border-radius: 50%;
    animation: pulseScale 2s ease-in-out infinite;
    opacity: 0.8;
}

.loading-spinner.pulse-orbital::after {
    top: 50%;
    left: 50%;
    width: 10px;
    height: 10px;
    margin: -5px 0 0 -5px;
    background: linear-gradient(45deg, var(--primary-700), var(--primary-400));
    border-radius: 50%;
    animation: orbitRotate 1.5s linear infinite;
    transform-origin: 25px 0;
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.6);
}

@keyframes pulseScale {
    0%, 100% { 
        transform: scale(0.8);
        opacity: 0.4;
    }
    25% {
        transform: scale(1);
        opacity: 0.8;
    }
    50% { 
        transform: scale(1.2);
        opacity: 1;
    }
    75% {
        transform: scale(1);
        opacity: 0.8;
    }
}

@keyframes orbitRotate {
    0% { 
        transform: rotate(0deg) scale(1);
        opacity: 1;
    }
    25% {
        transform: rotate(90deg) scale(1.2);
        opacity: 0.8;
    }
    50% {
        transform: rotate(180deg) scale(1);
        opacity: 1;
    }
    75% {
        transform: rotate(270deg) scale(1.2);
        opacity: 0.8;
    }
    100% { 
        transform: rotate(360deg) scale(1);
        opacity: 1;
    }
}

/* Spinner Premium - Partículas */
.loading-spinner.particles {
    width: 80px;
    height: 80px;
}

.loading-spinner.particles::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 8px;
    height: 8px;
    margin: -4px 0 0 -4px;
    background: var(--primary-500);
    border-radius: 50%;
    animation: particleOrbit 2.5s linear infinite;
    box-shadow: 
        25px 0 0 -2px var(--primary-400),
        18px 18px 0 -1px var(--primary-300),
        0 25px 0 -2px var(--primary-500),
        -18px 18px 0 -1px var(--primary-600),
        -25px 0 0 -2px var(--primary-700),
        -18px -18px 0 -1px var(--primary-400),
        0 -25px 0 -2px var(--primary-300),
        18px -18px 0 -1px var(--primary-500);
}

.loading-spinner.particles::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 4px;
    height: 4px;
    margin: -2px 0 0 -2px;
    background: var(--primary-600);
    border-radius: 50%;
    animation: particleOrbitReverse 2s linear infinite;
    box-shadow: 
        15px 0 0 var(--primary-200),
        11px 11px 0 var(--primary-300),
        0 15px 0 var(--primary-200),
        -11px 11px 0 var(--primary-300),
        -15px 0 0 var(--primary-200),
        -11px -11px 0 var(--primary-300),
        0 -15px 0 var(--primary-200),
        11px -11px 0 var(--primary-300);
}

@keyframes particleOrbit {
    0% { 
        transform: rotate(0deg) scale(1);
        opacity: 1;
    }
    25% {
        transform: rotate(90deg) scale(1.1);
        opacity: 0.8;
    }
    50% { 
        transform: rotate(180deg) scale(1);
        opacity: 1;
    }
    75% {
        transform: rotate(270deg) scale(1.1);
        opacity: 0.8;
    }
    100% { 
        transform: rotate(360deg) scale(1);
        opacity: 1;
    }
}

@keyframes particleOrbitReverse {
    0% { 
        transform: rotate(360deg) scale(0.8);
        opacity: 0.6;
    }
    25% {
        transform: rotate(270deg) scale(1);
        opacity: 1;
    }
    50% { 
        transform: rotate(180deg) scale(0.8);
        opacity: 0.6;
    }
    75% {
        transform: rotate(90deg) scale(1);
        opacity: 1;
    }
    100% { 
        transform: rotate(0deg) scale(0.8);
        opacity: 0.6;
    }
}

/* ========================================
   TEXTOS E CONTEÚDO
======================================== */

.loading-text {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
    
    /* Gradiente no texto */
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--primary-600) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.loading-subtitle {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--gray-600);
    margin: 0;
    line-height: 1.5;
}

/* Pontos animados no texto */
.loading-dots::after {
    content: '';
    animation: dots 1.5s infinite;
}

@keyframes dots {
    0%, 20% { content: ''; }
    40% { content: '.'; }
    60% { content: '..'; }
    80%, 100% { content: '...'; }
}

/* ========================================
   VARIAÇÕES DE COR POR TIPO
======================================== */

/* Loading Sucesso */
.loading-overlay.success .loading-spinner::before {
    border-top-color: var(--success-500);
    border-right-color: var(--success-300);
}

.loading-overlay.success .loading-spinner::after {
    border-bottom-color: var(--success-600);
    border-left-color: var(--success-400);
}

.loading-overlay.success .loading-text {
    background: linear-gradient(135deg, var(--success-700) 0%, var(--success-500) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Loading Aviso */
.loading-overlay.warning .loading-spinner::before {
    border-top-color: var(--warning-500);
    border-right-color: var(--warning-300);
}

.loading-overlay.warning .loading-spinner::after {
    border-bottom-color: var(--warning-600);
    border-left-color: var(--warning-400);
}

.loading-overlay.warning .loading-text {
    background: linear-gradient(135deg, var(--warning-700) 0%, var(--warning-500) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Loading Erro */
.loading-overlay.danger .loading-spinner::before {
    border-top-color: var(--error-500);
    border-right-color: var(--error-300);
}

.loading-overlay.danger .loading-spinner::after {
    border-bottom-color: var(--error-600);
    border-left-color: var(--error-400);
}

.loading-overlay.danger .loading-text {
    background: linear-gradient(135deg, var(--error-700) 0%, var(--error-500) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   LOADING PARA BOTÕES
======================================== */

.btn-loading {
    position: relative;
    pointer-events: none;
    overflow: hidden;
}

.btn-loading .btn-text {
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Efeito de ondas no botão */
.btn-loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: btnWave 2s ease-out infinite;
}

@keyframes btnWave {
    0% {
        width: 0;
        height: 0;
        opacity: 0.8;
    }
    100% {
        width: 200px;
        height: 200px;
        opacity: 0;
    }
}

/* ========================================
   LOADING PARA CAMPOS
======================================== */

.field-loading {
    position: relative;
}

.field-loading::after {
    content: '';
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border: 2px solid var(--gray-200);
    border-top: 2px solid var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* ========================================
   LOADING SKELETON
======================================== */

.skeleton-loading {
    background: linear-gradient(
        90deg,
        var(--gray-200) 25%,
        var(--gray-100) 50%,
        var(--gray-200) 75%
    );
    background-size: 200% 100%;
    animation: skeletonWave 1.5s infinite;
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
}

.skeleton-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.6),
        transparent
    );
    animation: skeletonShimmer 2s infinite;
}

@keyframes skeletonWave {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes skeletonShimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Tamanhos de skeleton */
.skeleton-text {
    height: 16px;
    margin-bottom: var(--space-2);
    border-radius: var(--radius-sm);
}

.skeleton-text.large {
    height: 24px;
}

.skeleton-text.small {
    height: 12px;
    width: 60%;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.skeleton-button {
    height: 40px;
    width: 120px;
    border-radius: var(--radius-lg);
}

/* ========================================
   PROGRESS BAR MODERNO
======================================== */

.progress-container {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: var(--space-4) 0;
    position: relative;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    border-radius: var(--radius-full);
    transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: progressShine 2s infinite;
}

@keyframes progressShine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Progress indeterminado */
.progress-bar.indeterminate {
    width: 30% !important;
    animation: progressSlide 2s infinite;
}

@keyframes progressSlide {
    0% { left: -30%; }
    100% { left: 100%; }
}

/* ========================================
   LOADING COM ETAPAS
======================================== */

.loading-steps {
    margin-top: var(--space-6);
}

.loading-step {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) 0;
    font-size: var(--text-sm);
    color: var(--gray-500);
    transition: color 0.3s ease;
}

.loading-step.active {
    color: var(--primary-600);
    font-weight: 600;
}

.loading-step.completed {
    color: var(--success-600);
}

.loading-step-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
    background: var(--gray-200);
    color: var(--gray-600);
    transition: all 0.3s ease;
}

.loading-step.active .loading-step-icon {
    background: var(--primary-500);
    color: white;
    animation: stepPulse 2s infinite;
}

.loading-step.completed .loading-step-icon {
    background: var(--success-500);
    color: white;
}

@keyframes stepPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* ========================================
   TEMA ESCURO
======================================== */

@media (prefers-color-scheme: dark) {
    .loading-container {
        background: rgba(15, 23, 42, 0.98);
        border: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .loading-text {
        background: linear-gradient(135deg, var(--gray-100) 0%, var(--primary-400) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    
    .loading-subtitle {
        color: var(--gray-400);
    }
    
    .skeleton-loading {
        background: linear-gradient(
            90deg,
            var(--gray-700) 25%,
            var(--gray-600) 50%,
            var(--gray-700) 75%
        );
    }
    
    .progress-container {
        background: var(--gray-700);
    }
}

/* ========================================
   RESPONSIVIDADE
======================================== */

@media (max-width: 640px) {
    .loading-container {
        margin: var(--space-4);
        min-width: auto;
        max-width: calc(100vw - var(--space-8));
        padding: var(--space-6);
    }
    
    .loading-spinner {
        width: 48px;
        height: 48px;
    }
    
    .loading-text {
        font-size: var(--text-lg);
    }
    
    .loading-subtitle {
        font-size: var(--text-xs);
    }
}

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

/* Reduzir movimento para usuários sensíveis */
@media (prefers-reduced-motion: reduce) {
    .loading-spinner::before,
    .loading-spinner::after,
    .loading-dots::after,
    .skeleton-loading,
    .progress-bar::after,
    .loading-step-icon {
        animation: none;
    }
    
    .loading-overlay {
        transition: opacity 0.2s ease;
    }
    
    .loading-container {
        transform: none;
        transition: opacity 0.2s ease;
    }
}

/* Alto contraste - compatibilidade aprimorada */
@media (-ms-high-contrast: active), (forced-colors: active) {
    .loading-container {
        border: 2px solid var(--gray-900);
        background: white;
    }
}
    
    .loading-text {
        color: var(--gray-900);
        background: none;
        -webkit-text-fill-color: unset;
    }
    
    .loading-spinner::before {
        border-top-color: var(--gray-900);
        border-right-color: var(--gray-700);
    }
    
    .loading-spinner::after {
        border-bottom-color: var(--gray-900);
        border-left-color: var(--gray-700);
    }
}

/* ========================================
   UTILITÁRIOS
======================================== */

.loading-overlay.fast-transition {
    transition-duration: 0.15s;
}

.loading-overlay.slow-transition {
    transition-duration: 0.6s;
}

.loading-container.compact {
    padding: var(--space-4);
    min-width: 240px;
}

.loading-container.large {
    padding: var(--space-12);
    min-width: 400px;
}

/* Spinner pequeno para uso inline */
.spinner-sm {
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-xs {
    width: 12px;
    height: 12px;
    border: 1.5px solid transparent;
    border-top: 1.5px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}