/**
 * Loading Styles
 * Gerador de Plano de Estudos
 * Desenvolvido por B20 Conteúdo Digital
 */

/* ===== LOADING OVERLAY ===== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
    backdrop-filter: blur(4px);
}

[data-theme="dark"] .loading-overlay {
    background: rgba(15, 15, 15, 0.95);
}

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

.loading-spinner p {
    color: var(--text-secondary);
    font-weight: 500;
    animation: pulse 1.5s ease-in-out infinite;
    transition: opacity 0.2s ease;
}

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

/* ===== SKELETON LOADING ===== */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--border-color) 25%,
        var(--background-color) 50%,
        var(--border-color) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

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

.skeleton-text {
    height: 16px;
    margin-bottom: var(--spacing-sm);
}

.skeleton-text:last-child {
    width: 70%;
}

.skeleton-title {
    height: 24px;
    width: 60%;
    margin-bottom: var(--spacing-md);
}

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

.skeleton-card {
    height: 120px;
    margin-bottom: var(--spacing-md);
}

.skeleton-button {
    height: 44px;
    width: 120px;
}

/* ===== LOADING CARDS ===== */
.loading-card {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.loading-card .skeleton-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.loading-card .skeleton-body {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* ===== CALENDAR SKELETON ===== */
.calendar-skeleton {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.calendar-skeleton .skeleton-day {
    background: var(--card-background);
    min-height: 100px;
    padding: var(--spacing-sm);
}

.calendar-skeleton .skeleton-day .skeleton {
    height: 20px;
    margin-bottom: var(--spacing-xs);
}

/* ===== PROGRESS SKELETON ===== */
.progress-skeleton {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.progress-skeleton .skeleton-bar {
    height: 24px;
    border-radius: var(--radius-sm);
}

/* ===== BUTTON LOADING STATE ===== */
.btn.loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn-primary.loading::after {
    border-top-color: white;
}

.btn-outline.loading::after {
    border-top-color: var(--text-color);
}

/* ===== INLINE LOADER ===== */
.inline-loader {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.inline-loader .dot {
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: dotPulse 1.4s ease-in-out infinite;
}

.inline-loader .dot:nth-child(1) { animation-delay: 0s; }
.inline-loader .dot:nth-child(2) { animation-delay: 0.2s; }
.inline-loader .dot:nth-child(3) { animation-delay: 0.4s; }

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

/* ===== PULL TO REFRESH ===== */
.pull-to-refresh {
    position: fixed;
    top: var(--header-height);
    left: 50%;
    transform: translateX(-50%) translateY(-100%);
    background: var(--card-background);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    z-index: var(--z-sticky);
    transition: transform var(--transition-base);
}

.pull-to-refresh.visible {
    transform: translateX(-50%) translateY(var(--spacing-md));
}

.pull-to-refresh .refresh-icon {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.pull-to-refresh span {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ===== CONTENT PLACEHOLDER ===== */
.content-placeholder {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
}

.placeholder-row {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.placeholder-row .skeleton-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
}

.placeholder-row .skeleton-lines {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.placeholder-row .skeleton-line {
    height: 12px;
    border-radius: var(--radius-sm);
}

.placeholder-row .skeleton-line:first-child {
    width: 80%;
}

.placeholder-row .skeleton-line:last-child {
    width: 60%;
}

/* ===== LAZY LOAD IMAGE ===== */
.lazy-image {
    position: relative;
    overflow: hidden;
    background: var(--background-color);
}

.lazy-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        var(--border-color) 25%,
        var(--background-color) 50%,
        var(--border-color) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.lazy-image.loaded::before {
    display: none;
}

.lazy-image img {
    opacity: 0;
    transition: opacity var(--transition-base);
}

.lazy-image.loaded img {
    opacity: 1;
}

/* ===== FORM LOADING ===== */
.form-loading {
    position: relative;
    pointer-events: none;
}

.form-loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="dark"] .form-loading::after {
    background: rgba(15, 15, 15, 0.7);
}

/* ===== TRANSITION STATES ===== */
.fade-enter {
    opacity: 0;
}

.fade-enter-active {
    opacity: 1;
    transition: opacity var(--transition-base);
}

.fade-exit {
    opacity: 1;
}

.fade-exit-active {
    opacity: 0;
    transition: opacity var(--transition-base);
}

.slide-enter {
    transform: translateY(20px);
    opacity: 0;
}

.slide-enter-active {
    transform: translateY(0);
    opacity: 1;
    transition: all var(--transition-base);
}

.slide-exit {
    transform: translateY(0);
    opacity: 1;
}

.slide-exit-active {
    transform: translateY(-20px);
    opacity: 0;
    transition: all var(--transition-base);
}