/**
 * Loading Spinners Component
 * Theme-aware loading indicators and spinners
 */

/* ===================================
   Spinner Base Styles
   =================================== */

.spinner {
    display: inline-block;
    position: relative;
}

/* ===================================
   Spinner Sizes
   =================================== */

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

.spinner-md {
    width: 24px;
    height: 24px;
}

.spinner-lg {
    width: 40px;
    height: 40px;
}

.spinner-xl {
    width: 64px;
    height: 64px;
}

/* ===================================
   Circle Spinner (Default)
   =================================== */

.spinner-circle {
    border: 3px solid rgba(var(--theme-primary-rgb), 0.1);
    border-top-color: var(--theme-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner-circle.spinner-sm {
    border-width: 2px;
}

.spinner-circle.spinner-xl {
    border-width: 4px;
}

/* ===================================
   Themed Spinners
   =================================== */

.spinner-primary {
    border-color: rgba(var(--theme-primary-rgb), 0.1);
    border-top-color: var(--theme-primary);
}

.spinner-accent {
    border-color: rgba(var(--theme-accent-rgb), 0.1);
    border-top-color: var(--theme-accent);
}

.spinner-success {
    border-color: rgba(var(--theme-success-rgb), 0.1);
    border-top-color: var(--theme-success);
}

.spinner-warning {
    border-color: rgba(var(--theme-warning-rgb), 0.1);
    border-top-color: var(--theme-warning);
}

.spinner-danger {
    border-color: rgba(var(--theme-danger-rgb), 0.1);
    border-top-color: var(--theme-danger);
}

.spinner-info {
    border-color: rgba(var(--theme-info-rgb), 0.1);
    border-top-color: var(--theme-info);
}

/* ===================================
   Dots Spinner
   =================================== */

.spinner-dots {
    display: inline-flex;
    gap: 6px;
    align-items: center;
}

.spinner-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--theme-primary);
    animation: bounce 1.4s infinite ease-in-out both;
}

.spinner-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.spinner-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

.spinner-dots.spinner-sm span {
    width: 6px;
    height: 6px;
}

.spinner-dots.spinner-lg span {
    width: 12px;
    height: 12px;
}

/* ===================================
   Pulse Spinner
   =================================== */

.spinner-pulse {
    border-radius: 50%;
    background: var(--theme-primary);
    opacity: 0.6;
    animation: pulse 1.2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ===================================
   Gradient Spinner
   =================================== */

.spinner-gradient {
    border: 3px solid transparent;
    border-radius: 50%;
    position: relative;
    animation: spin 1s linear infinite;
}

.spinner-gradient::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    background: var(--theme-gradient-primary);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    padding: 3px;
}

/* ===================================
   Loading Overlay
   =================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.loading-overlay .spinner-wrapper {
    background: var(--theme-bg-base);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.loading-overlay .spinner-wrapper .spinner {
    margin-bottom: 1rem;
}

.loading-overlay .loading-text {
    color: var(--theme-text-primary);
    font-size: 0.875rem;
    font-weight: 500;
}

/* ===================================
   Inline Loading
   =================================== */

.loading-inline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.loading-inline .spinner {
    flex-shrink: 0;
}

/* ===================================
   Button Loading State
   =================================== */

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

.btn-loading .btn-text {
    visibility: hidden;
}

.btn-loading .spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* ===================================
   Animations
   =================================== */

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

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

@keyframes pulse {
    0%, 100% {
        opacity: 0.6;
        transform: scale(0.8);
    }
    50% {
        opacity: 1;
        transform: scale(1.2);
    }
}

/* ===================================
   Skeleton Loaders
   =================================== */

.skeleton {
    background: linear-gradient(
        90deg,
        rgba(var(--theme-primary-rgb), 0.05) 0%,
        rgba(var(--theme-primary-rgb), 0.1) 50%,
        rgba(var(--theme-primary-rgb), 0.05) 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--border-radius-md);
}

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

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

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

.skeleton-card {
    height: 200px;
}

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