/* 加载状态和骨架屏 - 产品级加载体验 */

/* 骨架屏基础样式 */
.skeleton {
    position: relative;
    overflow: hidden;
    background: linear-gradient(
        90deg,
        var(--color-bg-subtle) 0%,
        var(--color-bg-hover) 50%,
        var(--color-bg-subtle) 100%
    );
    background-size: 200% 100%;
    border-radius: var(--radius-base);
    animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
    0%, 100% {
        background-position: 200% 0;
    }
    50% {
        background-position: -200% 0;
    }
}

/* 骨架屏变体 */
.skeleton-text {
    height: 16px;
    margin: 4px 0;
    border-radius: var(--radius-sm);
}

.skeleton-text-sm {
    height: 12px;
}

.skeleton-text-lg {
    height: 20px;
}

.skeleton-title {
    height: 24px;
    width: 60%;
    margin-bottom: 8px;
}

.skeleton-avatar {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
}

.skeleton-image {
    width: 100%;
    height: 180px;
    border-radius: var(--radius-md);
}

.skeleton-button {
    width: 100px;
    height: 32px;
    border-radius: var(--radius-base);
}

/* 加载指示器 */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border-light);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: spinner-rotate 0.6s linear infinite;
}

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

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

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

/* 加载状态容器 */
.loading-container {
    position: relative;
    min-height: 200px;
}

.loading-overlay {
    position: absolute;
    inset: 0;
    z-index: 10;
    display: grid;
    place-items: center;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(2px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base) var(--ease-out-smooth);
}

.loading-container[aria-busy="true"] .loading-overlay {
    opacity: 1;
    pointer-events: auto;
}

/* 渐进式加载 */
.fade-in {
    animation: fade-in 0.3s var(--ease-out-smooth) forwards;
}

@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-delay-1 { animation-delay: 0.05s; }
.fade-in-delay-2 { animation-delay: 0.1s; }
.fade-in-delay-3 { animation-delay: 0.15s; }
.fade-in-delay-4 { animation-delay: 0.2s; }

/* 加载进度条 */
.progress-bar {
    position: relative;
    width: 100%;
    height: 3px;
    overflow: hidden;
    background: var(--color-bg-hover);
    border-radius: var(--radius-full);
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-success));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow) var(--ease-out-smooth);
}

.progress-bar-indeterminate .progress-bar-fill {
    width: 40%;
    animation: progress-indeterminate 1.5s var(--ease-in-out-smooth) infinite;
}

@keyframes progress-indeterminate {
    0% {
        transform: translateX(-100%);
    }
    50% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(250%);
    }
}

/* 脉动效果 */
.pulse {
    animation: pulse 2s var(--ease-in-out-smooth) infinite;
}

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

/* 表格加载骨架 */
.table-skeleton {
    width: 100%;
}

.table-skeleton-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-3);
    padding: var(--space-3);
    border-bottom: 1px solid var(--color-border-light);
}

.table-skeleton-cell {
    height: 20px;
}

/* 卡片加载骨架 */
.card-skeleton {
    padding: var(--space-4);
    background: var(--color-bg-base);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
}

.card-skeleton-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.card-skeleton-body {
    display: grid;
    gap: var(--space-2);
}

/* 乐观更新提示 */
.optimistic-update {
    position: relative;
    opacity: 0.6;
    pointer-events: none;
    transition: opacity var(--transition-base) var(--ease-out-smooth);
}

.optimistic-update::after {
    position: absolute;
    inset: 0;
    content: "";
    border: 2px solid var(--color-primary);
    border-radius: inherit;
    opacity: 0.2;
    animation: optimistic-pulse 1s ease-in-out infinite;
}

@keyframes optimistic-pulse {
    0%, 100% {
        opacity: 0.2;
    }
    50% {
        opacity: 0.4;
    }
}