/**
 * مستر اير — Skeleton UI + Loading States + Empty States
 * Progressive Enhancement — لا يكسر أي CSS حالي
 */

/* ═══════════════════════════════════════════
   SKELETON BASE — Shimmer Animation
   ═══════════════════════════════════════════ */
@keyframes mrairShimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
@keyframes mrairFadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes mrairSpin {
    to { transform: rotate(360deg); }
}

.mrair-skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 37%, #f0f0f0 63%);
    background-size: 400% 100%;
    animation: mrairShimmer 1.6s ease infinite;
    border-radius: 8px;
}

.mrair-fade-in {
    animation: mrairFadeInUp .35s ease both;
}

/* ═══════════════════════════════════════════
   PRODUCT SKELETON CARD
   ═══════════════════════════════════════════ */
.mrair-product-skeleton {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #f1f5f9;
}
.mrair-product-skeleton .mrair-sk-image {
    width: 100%;
    padding-top: 85%;
    background: linear-gradient(90deg, #f0f0f0 25%, #e8e8e8 37%, #f0f0f0 63%);
    background-size: 400% 100%;
    animation: mrairShimmer 1.6s ease infinite;
}
.mrair-product-skeleton .mrair-sk-body {
    padding: .75rem;
}
.mrair-product-skeleton .mrair-sk-line {
    height: 12px;
    border-radius: 6px;
    margin-bottom: .5rem;
    background: linear-gradient(90deg, #f0f0f0 25%, #e8e8e8 37%, #f0f0f0 63%);
    background-size: 400% 100%;
    animation: mrairShimmer 1.6s ease infinite;
}
.mrair-product-skeleton .mrair-sk-line.short { width: 55%; }
.mrair-product-skeleton .mrair-sk-line.medium { width: 75%; }
.mrair-product-skeleton .mrair-sk-line.price {
    height: 16px;
    width: 40%;
    margin-top: .75rem;
    border-radius: 4px;
}
.mrair-product-skeleton .mrair-sk-btn {
    height: 36px;
    border-radius: 8px;
    margin-top: .75rem;
    background: linear-gradient(90deg, #f0f0f0 25%, #e8e8e8 37%, #f0f0f0 63%);
    background-size: 400% 100%;
    animation: mrairShimmer 1.6s ease infinite;
}

/* Stagger animation for multiple skeletons */
.mrair-product-skeleton:nth-child(2) .mrair-sk-image,
.mrair-product-skeleton:nth-child(2) .mrair-sk-line,
.mrair-product-skeleton:nth-child(2) .mrair-sk-btn { animation-delay: .1s; }
.mrair-product-skeleton:nth-child(3) .mrair-sk-image,
.mrair-product-skeleton:nth-child(3) .mrair-sk-line,
.mrair-product-skeleton:nth-child(3) .mrair-sk-btn { animation-delay: .2s; }
.mrair-product-skeleton:nth-child(4) .mrair-sk-image,
.mrair-product-skeleton:nth-child(4) .mrair-sk-line,
.mrair-product-skeleton:nth-child(4) .mrair-sk-btn { animation-delay: .3s; }

/* ═══════════════════════════════════════════
   BUTTON LOADING STATE
   ═══════════════════════════════════════════ */
.mrair-btn-loading {
    position: relative;
    pointer-events: none;
    opacity: .75;
    cursor: wait !important;
}
.mrair-btn-loading .mrair-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: mrairSpin .6s linear infinite;
    margin-inline-end: 6px;
    vertical-align: middle;
}
/* Success flash */
.mrair-btn-success {
    background: #10b981 !important;
    border-color: #10b981 !important;
    color: #fff !important;
    transition: background .2s, border-color .2s;
}

/* ═══════════════════════════════════════════
   AREA LOADING OVERLAY
   ═══════════════════════════════════════════ */
.mrair-loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: inherit;
    backdrop-filter: blur(1px);
}
.mrair-loading-overlay .mrair-overlay-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--primary, #0077C8);
    border-top-color: transparent;
    border-radius: 50%;
    animation: mrairSpin .7s linear infinite;
}

/* Container must be positioned */
.mrair-loading-parent {
    position: relative;
}

/* ═══════════════════════════════════════════
   ENHANCED EMPTY STATES
   ═══════════════════════════════════════════ */
.mrair-empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    animation: mrairFadeInUp .4s ease both;
}
.mrair-empty-state .mrair-es-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.25rem;
    background: linear-gradient(135deg, #f0f4ff, #e8f0fe);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary, #0077C8);
}
.mrair-empty-state .mrair-es-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: #1e293b;
    margin: 0 0 .5rem;
}
.mrair-empty-state .mrair-es-desc {
    font-size: .88rem;
    color: #64748b;
    margin: 0 0 1.25rem;
    line-height: 1.6;
}
.mrair-empty-state .mrair-es-btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .65rem 1.5rem;
    background: var(--primary, #0077C8);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: .88rem;
    font-weight: 600;
    font-family: inherit;
    text-decoration: none;
    cursor: pointer;
    transition: transform .15s, box-shadow .15s;
}
.mrair-empty-state .mrair-es-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(0,119,200,.25);
}
.mrair-empty-state .mrair-es-btn.secondary {
    background: transparent;
    color: var(--primary, #0077C8);
    border: 1.5px solid var(--primary, #0077C8);
    margin-inline-start: .5rem;
}
.mrair-empty-state .mrair-es-btn.secondary:hover {
    background: rgba(0,119,200,.06);
    box-shadow: none;
}
.mrair-empty-state .mrair-es-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    flex-wrap: wrap;
}

/* ═══════════════════════════════════════════
   CART PAGE — Row loading
   ═══════════════════════════════════════════ */
tr.mrair-row-loading {
    opacity: .5;
    pointer-events: none;
    transition: opacity .2s;
}
.qty-btn.mrair-btn-loading,
.cart-remove.mrair-btn-loading {
    opacity: .5;
}

/* ═══════════════════════════════════════════
   CHECKOUT — Submit protection
   ═══════════════════════════════════════════ */
.mrair-checkout-submitting {
    position: relative;
}
.mrair-checkout-submitting::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,.4);
    z-index: 5;
    border-radius: inherit;
}

/* ═══════════════════════════════════════════
   REDUCED MOTION
   ═══════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
    .mrair-skeleton,
    .mrair-product-skeleton .mrair-sk-image,
    .mrair-product-skeleton .mrair-sk-line,
    .mrair-product-skeleton .mrair-sk-btn,
    .mrair-btn-loading .mrair-spinner,
    .mrair-loading-overlay .mrair-overlay-spinner,
    .mrair-fade-in,
    .mrair-empty-state {
        animation: none !important;
        transition: none !important;
    }
    .mrair-skeleton,
    .mrair-product-skeleton .mrair-sk-image,
    .mrair-product-skeleton .mrair-sk-line,
    .mrair-product-skeleton .mrair-sk-btn {
        background: #e8e8e8;
    }
}

/* ═══════════════════════════════════════════
   MOBILE — z-index safety
   ═══════════════════════════════════════════ */
@media (max-width: 768px) {
    .mrair-loading-overlay {
        z-index: 5; /* Below WhatsApp float (9999), AC Wizard, Bottom Nav */
    }
    .mrair-empty-state {
        padding: 2rem 1rem;
    }
    .mrair-empty-state .mrair-es-icon {
        width: 64px;
        height: 64px;
        font-size: 1.6rem;
    }
    .mrair-empty-state .mrair-es-title { font-size: 1.05rem; }
    .mrair-empty-state .mrair-es-desc { font-size: .82rem; }
}