/**
 * Loading States & Skeleton Screens
 * Makes the app feel faster with visual feedback
 */

/* Global loading bar at top of page */
.loading-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--primary, #4169E1) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    animation: loadingSlide 1.5s ease-in-out infinite;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.loading-bar.active {
    opacity: 1;
}

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

/* Skeleton Loading for Cards */
.skeleton {
    background: linear-gradient(
        90deg,
        #f0f0f0 25%,
        #e0e0e0 50%,
        #f0f0f0 75%
    );
    background-size: 200% 100%;
    animation: skeletonShimmer 1.5s ease-in-out infinite;
    border-radius: 8px;
}

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

.skeleton-card {
    padding: 20px;
    margin-bottom: 16px;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
}

.skeleton-line {
    height: 16px;
    margin-bottom: 12px;
    border-radius: 4px;
}

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

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

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

/* Button Loading State */
.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-right-color: transparent;
    animation: buttonSpinner 0.6s linear infinite;
    color: white;
}

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

/* Optimistic UI - Instant Feedback */
.optimistic-fade {
    animation: optimisticFade 0.3s ease-out;
}

@keyframes optimisticFade {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Success checkmark animation */
.success-checkmark {
    width: 80px;
    height: 80px;
    margin: 0 auto;
}

.success-checkmark .check-icon {
    width: 80px;
    height: 80px;
    position: relative;
    border-radius: 50%;
    box-sizing: content-box;
    border: 4px solid #4CAF50;
}

.success-checkmark .check-icon::before {
    top: 3px;
    left: -2px;
    width: 30px;
    transform-origin: 100% 50%;
    border-radius: 100px 0 0 100px;
}

.success-checkmark .check-icon::after {
    top: 0;
    left: 30px;
    width: 60px;
    transform-origin: 0 50%;
    border-radius: 0 100px 100px 0;
    animation: checkmarkRotate 4.25s ease-in;
}

.success-checkmark .check-icon::before,
.success-checkmark .check-icon::after {
    content: '';
    height: 100px;
    position: absolute;
    background: #FFFFFF;
    transform: rotate(-45deg);
}

.success-checkmark .check-icon .icon-line {
    height: 5px;
    background-color: #4CAF50;
    display: block;
    border-radius: 2px;
    position: absolute;
    z-index: 10;
}

.success-checkmark .check-icon .icon-line.line-tip {
    top: 46px;
    left: 14px;
    width: 25px;
    transform: rotate(45deg);
    animation: checkmarkIcon-tip 0.75s;
}

.success-checkmark .check-icon .icon-line.line-long {
    top: 38px;
    right: 8px;
    width: 47px;
    transform: rotate(-45deg);
    animation: checkmarkIcon-long 0.75s;
}

@keyframes checkmarkRotate {
    0% { transform: rotate(-45deg); }
    5% { transform: rotate(-45deg); }
    12% { transform: rotate(-405deg); }
    100% { transform: rotate(-405deg); }
}

@keyframes checkmarkIcon-tip {
    0% { width: 0; left: 1px; top: 19px; }
    54% { width: 0; left: 1px; top: 19px; }
    70% { width: 50px; left: -8px; top: 37px; }
    84% { width: 17px; left: 21px; top: 48px; }
    100% { width: 25px; left: 14px; top: 45px; }
}

@keyframes checkmarkIcon-long {
    0% { width: 0; right: 46px; top: 54px; }
    65% { width: 0; right: 46px; top: 54px; }
    84% { width: 55px; right: 0px; top: 35px; }
    100% { width: 47px; right: 8px; top: 38px; }
}

/* Pulse effect for realtime updates */
.pulse-update {
    animation: pulseGlow 2s ease-in-out infinite;
}

@keyframes pulseGlow {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(65, 105, 225, 0.4);
    }
    50% {
        box-shadow: 0 0 20px 10px rgba(65, 105, 225, 0);
    }
}