/* ========================================
   Loading States & Skeleton Screens
   yuru.be - Industrial, Minimal, Precise
   ======================================== */

/* ========================================
   Core Shimmer Animation
   ======================================== */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

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

@keyframes fadeInSkeleton {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Base Skeleton Class
   ======================================== */
.skeleton {
    background: linear-gradient(
        90deg,
        rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.02) 0%,
        rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.08) 50%,
        rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.02) 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 2s ease-in-out infinite;
    border-radius: 6px;
    position: relative;
    overflow: hidden;
}

.skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.12) 50%,
        transparent 100%
    );
    transform: translateX(-100%);
    animation: shimmerAlt 2s ease-in-out infinite;
}

/* ========================================
   Skeleton Text Variations
   ======================================== */
.skeleton-text {
    height: 1rem;
    width: 100%;
    margin-bottom: 0.5rem;
}

.skeleton-text-sm {
    height: 0.75rem;
}

.skeleton-text-lg {
    height: 1.25rem;
}

.skeleton-text-short {
    width: 60%;
}

.skeleton-text-medium {
    width: 80%;
}

.skeleton-text-long {
    width: 100%;
}

/* ========================================
   Skeleton Card Components
   ======================================== */
.skeleton-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    animation: fadeInSkeleton 0.4s ease-out;
}

.skeleton-card-sm {
    padding: 1rem;
    border-radius: 10px;
}

.skeleton-card-lg {
    padding: 2rem;
    border-radius: 16px;
}

/* Blog Post Card Skeleton */
.skeleton-post-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    animation: fadeInSkeleton 0.4s ease-out;
}

.skeleton-post-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.skeleton-post-date {
    height: 0.75rem;
    width: 80px;
}

.skeleton-post-mood {
    height: 1rem;
    width: 60px;
    border-radius: 4px;
}

.skeleton-post-title {
    height: 1.5rem;
    width: 85%;
    margin-bottom: 0.75rem;
}

.skeleton-post-excerpt {
    height: 0.9rem;
    margin-bottom: 0.5rem;
}

.skeleton-post-excerpt:last-of-type {
    width: 70%;
    margin-bottom: 1rem;
}

.skeleton-post-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.skeleton-post-tag {
    height: 1rem;
    width: 50px;
    border-radius: 3px;
}

.skeleton-post-read {
    height: 0.8rem;
    width: 80px;
}

/* ========================================
   Skeleton Circle (Avatar/Icon)
   ======================================== */
.skeleton-circle {
    border-radius: 50%;
    aspect-ratio: 1;
}

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

.skeleton-circle-md {
    width: 48px;
    height: 48px;
}

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

/* ========================================
   Loading Spinner
   ======================================== */
.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
}

.loading-spinner-sm {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

.loading-spinner-lg {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

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

/* Centered spinner container */
.loading-spinner-center {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

/* ========================================
   Loading Progress Bar
   ======================================== */
.loading-progress {
    width: 100%;
    height: 3px;
    background: rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.08);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
}

.loading-progress-bar {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.loading-progress-indeterminate {
    position: absolute;
    height: 100%;
    width: 30%;
    background: var(--accent);
    border-radius: 2px;
    animation: progressIndeterminate 1.5s ease-in-out infinite;
}

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

/* Top page loading bar */
.loading-progress-top {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    height: 2px;
}

/* ========================================
   Typing Indicator (Chat/Messages)
   ======================================== */
.loading-typing {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 0.75rem 1rem;
    background: rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.03);
    border-radius: 12px;
    border-bottom-left-radius: 4px;
}

.loading-typing-dot {
    width: 6px;
    height: 6px;
    background: var(--dim);
    border-radius: 50%;
    animation: typingBounce 1.4s infinite ease-in-out;
}

.loading-typing-dot:nth-child(1) {
    animation-delay: 0s;
}

.loading-typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.loading-typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-6px);
        opacity: 1;
    }
}

/* ========================================
   Pulse Animation (Subtle Loading State)
   ======================================== */
.loading-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

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

/* ========================================
   Loading Overlay
   ======================================== */
.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

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

.loading-overlay-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--fg);
}

.loading-overlay-text {
    font-size: 0.85rem;
    color: var(--dim);
}

/* ========================================
   Content Loading State
   ======================================== */
.content-loading {
    opacity: 0.5;
    pointer-events: none;
    user-select: none;
}

.content-loaded {
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ========================================
   Skeleton Link/Button
   ======================================== */
.skeleton-link {
    height: 44px;
    background: var(--bg);
    border-radius: 0;
}

.skeleton-btn {
    height: 44px;
    width: 120px;
    border-radius: 8px;
}

/* ========================================
   Grid of Skeleton Cards
   ======================================== */
.skeleton-grid {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.skeleton-grid-3col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

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

/* ========================================
   Loading State for Tools/Outputs
   ======================================== */
.tool-loading {
    position: relative;
    min-height: 100px;
}

.tool-loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.02);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ========================================
   Skeleton for Homepage Grid
   ======================================== */
.skeleton-home-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.skeleton-column {
    display: flex;
    flex-direction: column;
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
}

.skeleton-section-label {
    height: 2rem;
    background: var(--bg);
    padding: 1rem;
    border-radius: 0;
}

@media (max-width: 768px) {
    .skeleton-home-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Loading Fade Transition
   ======================================== */
.fade-out {
    animation: fadeOut 0.3s ease-out forwards;
}

.fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

/* ========================================
   Accessibility - Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    .skeleton,
    .skeleton::after,
    .loading-spinner,
    .loading-typing-dot,
    .loading-pulse,
    .loading-progress-indeterminate {
        animation: none !important;
    }

    .skeleton {
        background: rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.05);
    }

    .loading-spinner {
        border-top-color: var(--accent);
        opacity: 0.6;
    }

    .loading-typing-dot {
        opacity: 0.4;
    }
}

/* ========================================
   Page Initial Load Skeleton
   ======================================== */
.page-skeleton {
    opacity: 1;
    transition: opacity 0.3s ease-out;
}

.page-skeleton.hidden {
    opacity: 0;
    pointer-events: none;
}

/* Hide skeleton once content loads */
.skeleton-container.loaded {
    display: none;
}

/* ========================================
   Inline Loading States
   ======================================== */
.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid currentColor;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.6s linear infinite;
    opacity: 0.6;
}

/* ========================================
   Loading State for Images
   ======================================== */
.img-loading {
    background: linear-gradient(
        90deg,
        rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.02) 0%,
        rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.06) 50%,
        rgba(var(--accent-r),var(--accent-g),var(--accent-b),0.02) 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 2s ease-in-out infinite;
}

.img-loaded {
    animation: fadeIn 0.4s ease-out;
}

/* ========================================
   Utility Classes
   ======================================== */
.loading-hidden {
    display: none !important;
}

.loading-visible {
    display: block !important;
}

.loading-state-active {
    cursor: wait;
}

/* Screen reader only loading text */
.sr-loading {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}