/**
 * Skeleton Screen 로딩 UI (항목 110)
 * 
 * 목표: 로딩 중 시각적 피드백
 */

/* Skeleton 기본 요소 */
.skeleton {
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 20%,
        #f0f0f0 40%,
        #f0f0f0 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: 4px;
}

/* 다크 모드 Skeleton */
[data-theme="dark"] .skeleton {
    background: linear-gradient(
        90deg,
        #2d3748 0%,
        #4a5568 20%,
        #2d3748 40%,
        #2d3748 100%
    );
    background-size: 200% 100%;
}

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

/* Skeleton 타입별 */
.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-text-large {
    height: 24px;
    margin-bottom: 12px;
}

.skeleton-card {
    height: 200px;
    border-radius: 12px;
}

.skeleton-circle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
}

.skeleton-chart {
    height: 300px;
    border-radius: 8px;
}

.skeleton-button {
    height: 44px;
    width: 120px;
    border-radius: 8px;
}

/* 분석 결과 로딩 레이아웃 */
.skeleton-analysis-result {
    padding: 20px;
}

.skeleton-analysis-result .skeleton-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.skeleton-analysis-result .skeleton-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.skeleton-metric-card {
    height: 120px;
    border-radius: 12px;
}

.skeleton-table-row {
    display: flex;
    gap: 12px;
    margin-bottom: 8px;
}

.skeleton-table-cell {
    height: 40px;
    flex: 1;
    border-radius: 4px;
}

/* 로딩 중 메시지 */
.loading-message {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary, #6b7280);
}

.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid #f3f4f6;
    border-top-color: #fbbf24;
    border-radius: 50%;
    animation: spinner-rotate 0.8s linear infinite;
    margin-bottom: 16px;
}

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

/* Skeleton 컨테이너 */
.skeleton-container {
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* 펄스 애니메이션 (대안) */
.skeleton-pulse {
    animation: skeleton-pulse 1.5s ease-in-out infinite;
}

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

/* 모바일 최적화 */
@media (max-width: 768px) {
    .skeleton-analysis-result .skeleton-metrics {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .skeleton-chart {
        height: 250px;
    }
}