/**
 * 通用 UI 状态组件（空态 / 加载 / 错误）
 * 与 legacy .empty / .loading 并存，新代码优先使用 .mk-* 类名。
 */

.mk-empty,
.mk-empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-flow: column;
    min-height: 280px;
    width: 100%;
    color: var(--mk-color-text-placeholder);
    text-align: center;
    gap: calc(var(--mk-gap) * 0.75);
}

.mk-empty__icon,
.mk-empty img {
    width: min(250px, 60vw);
    opacity: 0.5;
}

.mk-empty__title {
    font-size: 16px;
    font-weight: 600;
    color: var(--mk-color-text-muted);
}

.mk-empty__desc {
    font-size: 14px;
    color: var(--mk-color-text-subtle);
    max-width: 360px;
}

.mk-loading,
.mk-loading-state {
    position: relative;
    min-height: 120px;
}

.mk-loading::after,
.mk-loading-state::after {
    content: '';
    position: absolute;
    inset: 0;
    margin: auto;
    width: 24px;
    height: 30px;
    background: url(images/loading.svg) no-repeat center center;
    background-size: contain;
}

.mk-error,
.mk-error-state {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-flow: column;
    min-height: 200px;
    padding: calc(var(--mk-gap) * 1.5);
    color: var(--mk-color-text-muted);
    text-align: center;
    gap: calc(var(--mk-gap) * 0.5);
}

.mk-error__title {
    font-size: 16px;
    font-weight: 600;
    color: #e11d48;
}

.mk-error__desc {
    font-size: 14px;
    color: var(--mk-color-text-subtle);
}

.mk-error__retry {
    margin-top: var(--mk-gap);
    padding: 8px 16px;
    border-radius: var(--mk-radius-button);
    background: var(--mk-color-primary);
    color: var(--mk-color-on-primary);
    cursor: pointer;
    border: none;
    font-size: 14px;
}

.mk-error__retry:hover {
    opacity: 0.92;
}

.mk-skeleton {
    background: linear-gradient(
        90deg,
        var(--mk-color-surface-muted) 25%,
        color-mix(in srgb, var(--mk-color-border) 40%, var(--mk-color-surface)) 50%,
        var(--mk-color-surface-muted) 75%
    );
    background-size: 200% 100%;
    animation: mk-skeleton-shimmer 1.2s ease-in-out infinite;
    border-radius: var(--mk-radius);
}

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