/**
 * Skeleton Loading CSS
 * Estilos para loading skeletons durante carregamento de conteúdo
 * @version 1.0.0
 */

/* ========================================
   Base Skeleton Animation
======================================== */

@keyframes skeleton-shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

@keyframes skeleton-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* ========================================
   Base Skeleton Styles
======================================== */

.skeleton {
    position: relative;
    overflow: hidden;
    background-color: var(--skeleton-base, #E5E7EB);
    border-radius: 4px;
}

/* Shimmer effect (default) */
.skeleton::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.4) 50%,
        transparent 100%
    );
    background-size: 200px 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
}

/* Pulse effect (alternative) */
.skeleton--pulse {
    animation: skeleton-pulse 1.5s ease-in-out infinite;
}

.skeleton--pulse::after {
    display: none;
}

/* Dark mode */
[data-theme="dark"] .skeleton,
.dark .skeleton {
    background-color: var(--skeleton-base-dark, #374151);
}

[data-theme="dark"] .skeleton::after,
.dark .skeleton::after {
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.1) 50%,
        transparent 100%
    );
}

/* ========================================
   Skeleton Shapes
======================================== */

/* Texto */
.skeleton-text {
    height: 1em;
    width: 100%;
    margin-bottom: 0.5em;
}

.skeleton-text:last-child {
    width: 80%;
}

.skeleton-text--title {
    height: 1.5em;
    width: 60%;
    margin-bottom: 1em;
}

.skeleton-text--subtitle {
    height: 1.2em;
    width: 40%;
}

/* Parágrafos */
.skeleton-paragraph {
    display: flex;
    flex-direction: column;
    gap: 0.5em;
}

.skeleton-paragraph .skeleton-text:nth-child(1) { width: 100%; }
.skeleton-paragraph .skeleton-text:nth-child(2) { width: 95%; }
.skeleton-paragraph .skeleton-text:nth-child(3) { width: 90%; }
.skeleton-paragraph .skeleton-text:nth-child(4) { width: 70%; }

/* Círculo (Avatar) */
.skeleton-circle {
    border-radius: 50%;
}

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

.skeleton-avatar--sm {
    width: 32px;
    height: 32px;
}

.skeleton-avatar--lg {
    width: 64px;
    height: 64px;
}

.skeleton-avatar--xl {
    width: 96px;
    height: 96px;
}

/* Retângulos */
.skeleton-rect {
    width: 100%;
    height: 100px;
}

.skeleton-rect--sm {
    height: 50px;
}

.skeleton-rect--lg {
    height: 200px;
}

/* Imagem/Thumbnail */
.skeleton-image {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: 8px;
}

.skeleton-thumbnail {
    width: 80px;
    height: 80px;
    border-radius: 8px;
}

/* Botão */
.skeleton-button {
    height: 40px;
    width: 120px;
    border-radius: 8px;
}

.skeleton-button--full {
    width: 100%;
}

/* Badge/Tag */
.skeleton-badge {
    height: 24px;
    width: 60px;
    border-radius: 12px;
    display: inline-block;
}

/* ========================================
   Skeleton Layouts/Components
======================================== */

/* Card Skeleton */
.skeleton-card {
    padding: 1rem;
    background: var(--card-bg, #fff);
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.skeleton-card__image {
    width: 100%;
    height: 150px;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.skeleton-card__title {
    height: 1.5em;
    width: 70%;
    margin-bottom: 0.5em;
}

.skeleton-card__text {
    height: 1em;
    width: 100%;
    margin-bottom: 0.25em;
}

.skeleton-card__text:last-of-type {
    width: 60%;
}

.skeleton-card__actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

/* Quiz Card Skeleton */
.skeleton-quiz-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--card-bg, #fff);
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.skeleton-quiz-card__header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.skeleton-quiz-card__icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
}

.skeleton-quiz-card__meta {
    flex: 1;
}

.skeleton-quiz-card__title {
    height: 1.25em;
    width: 60%;
    margin-bottom: 0.5em;
}

.skeleton-quiz-card__subtitle {
    height: 0.9em;
    width: 40%;
}

.skeleton-quiz-card__description {
    display: flex;
    flex-direction: column;
    gap: 0.4em;
}

.skeleton-quiz-card__tags {
    display: flex;
    gap: 0.5rem;
}

/* List Item Skeleton */
.skeleton-list-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color, #E5E7EB);
}

.skeleton-list-item__avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    flex-shrink: 0;
}

.skeleton-list-item__content {
    flex: 1;
}

.skeleton-list-item__title {
    height: 1em;
    width: 50%;
    margin-bottom: 0.5em;
}

.skeleton-list-item__subtitle {
    height: 0.8em;
    width: 70%;
}

/* Profile Skeleton */
.skeleton-profile {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
}

.skeleton-profile__avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
}

.skeleton-profile__name {
    height: 1.5em;
    width: 150px;
}

.skeleton-profile__bio {
    height: 1em;
    width: 200px;
}

.skeleton-profile__stats {
    display: flex;
    gap: 2rem;
}

.skeleton-profile__stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.skeleton-profile__stat-value {
    height: 1.5em;
    width: 40px;
}

.skeleton-profile__stat-label {
    height: 0.8em;
    width: 60px;
}

/* Chat Message Skeleton */
.skeleton-message {
    display: flex;
    gap: 0.75rem;
    padding: 0.5rem;
}

.skeleton-message--sent {
    flex-direction: row-reverse;
}

.skeleton-message__avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    flex-shrink: 0;
}

.skeleton-message__bubble {
    max-width: 70%;
    padding: 0.75rem 1rem;
    border-radius: 16px;
}

.skeleton-message__text {
    height: 1em;
    width: 200px;
    margin-bottom: 0.25em;
}

.skeleton-message__text:last-child {
    width: 150px;
    margin-bottom: 0;
}

/* Result Skeleton */
.skeleton-result {
    padding: 1.5rem;
    background: var(--card-bg, #fff);
    border-radius: 12px;
    text-align: center;
}

.skeleton-result__score {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 1rem;
}

.skeleton-result__title {
    height: 1.5em;
    width: 60%;
    margin: 0 auto 0.5em;
}

.skeleton-result__description {
    height: 1em;
    width: 80%;
    margin: 0 auto 0.25em;
}

/* Question Skeleton */
.skeleton-question {
    padding: 1.5rem;
}

.skeleton-question__number {
    height: 0.9em;
    width: 100px;
    margin-bottom: 1rem;
}

.skeleton-question__text {
    height: 1.25em;
    width: 90%;
    margin-bottom: 1.5rem;
}

.skeleton-question__options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.skeleton-question__option {
    height: 48px;
    width: 100%;
    border-radius: 12px;
}

/* Match Card Skeleton */
.skeleton-match-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--card-bg, #fff);
    border-radius: 12px;
}

.skeleton-match-card__avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    flex-shrink: 0;
}

.skeleton-match-card__info {
    flex: 1;
}

.skeleton-match-card__name {
    height: 1.1em;
    width: 120px;
    margin-bottom: 0.5em;
}

.skeleton-match-card__compatibility {
    height: 0.9em;
    width: 80px;
}

.skeleton-match-card__action {
    width: 80px;
    height: 36px;
    border-radius: 8px;
}

/* ========================================
   Grid Layouts
======================================== */

.skeleton-grid {
    display: grid;
    gap: 1rem;
}

.skeleton-grid--2 {
    grid-template-columns: repeat(2, 1fr);
}

.skeleton-grid--3 {
    grid-template-columns: repeat(3, 1fr);
}

.skeleton-grid--4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 768px) {
    .skeleton-grid--3,
    .skeleton-grid--4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .skeleton-grid--2,
    .skeleton-grid--3,
    .skeleton-grid--4 {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Loading States
======================================== */

/* Container com skeleton */
.loading-container {
    min-height: 200px;
}

/* Esconder conteúdo real durante loading */
.is-loading > *:not(.skeleton):not([class*="skeleton-"]) {
    display: none !important;
}

.is-loading .skeleton,
.is-loading [class*="skeleton-"] {
    display: block;
}

/* Mostrar conteúdo quando carregado */
.is-loaded .skeleton,
.is-loaded [class*="skeleton-"] {
    display: none !important;
}

/* ========================================
   Accessibility - Reduced Motion
======================================== */

@media (prefers-reduced-motion: reduce) {
    .skeleton::after {
        animation: none;
    }
    
    .skeleton--pulse {
        animation: none;
        opacity: 0.7;
    }
}

/* ========================================
   Utility Classes
======================================== */

/* Width variations */
.skeleton-w-25 { width: 25%; }
.skeleton-w-50 { width: 50%; }
.skeleton-w-75 { width: 75%; }
.skeleton-w-100 { width: 100%; }

/* Height variations */
.skeleton-h-1 { height: 0.5rem; }
.skeleton-h-2 { height: 1rem; }
.skeleton-h-3 { height: 1.5rem; }
.skeleton-h-4 { height: 2rem; }
.skeleton-h-6 { height: 3rem; }
.skeleton-h-8 { height: 4rem; }

/* Margins */
.skeleton-mb-1 { margin-bottom: 0.25rem; }
.skeleton-mb-2 { margin-bottom: 0.5rem; }
.skeleton-mb-3 { margin-bottom: 1rem; }
.skeleton-mb-4 { margin-bottom: 1.5rem; }

/* Border radius variations */
.skeleton-rounded-none { border-radius: 0; }
.skeleton-rounded-sm { border-radius: 2px; }
.skeleton-rounded { border-radius: 4px; }
.skeleton-rounded-md { border-radius: 8px; }
.skeleton-rounded-lg { border-radius: 12px; }
.skeleton-rounded-xl { border-radius: 16px; }
.skeleton-rounded-full { border-radius: 9999px; }

/* Inline skeleton */
.skeleton-inline {
    display: inline-block;
    vertical-align: middle;
}