/* ============================================
   骨架屏样式 - 页面加载占位
   ============================================ */

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

.skeleton {
  background: linear-gradient(
    90deg,
    var(--skeleton-base) 25%,
    var(--skeleton-shine) 37%,
    var(--skeleton-base) 63%
  );
  background-size: 400% 100%;
  animation: shimmer var(--skeleton-duration) ease infinite;
  border-radius: var(--radius-sm);
  color: transparent !important;
}

.skeleton-circle {
  border-radius: 50%;
}

.skeleton-card {
  height: 120px;
  border-radius: var(--radius-lg);
}

.skeleton-text {
  height: 16px;
  border-radius: 4px;
}

.skeleton-text-sm {
  height: 12px;
  width: 60%;
  border-radius: 4px;
}

.skeleton-heading {
  height: 24px;
  width: 40%;
  border-radius: 6px;
}

.skeleton-btn {
  height: 40px;
  width: 120px;
  border-radius: var(--radius-md);
}

/* 计时器页面骨架 */
.skeleton-timer-ring {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  margin: 0 auto;
}

.skeleton-timer-controls {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin-top: var(--space-xl);
}

.skeleton-timer-controls .skeleton {
  border-radius: var(--radius-full);
}

/* 统计页面骨架 */
.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.skeleton-chart {
  height: 280px;
  border-radius: var(--radius-lg);
}

.skeleton-table-row {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
}

.skeleton-table-row .skeleton {
  flex: 1;
  height: 14px;
}

/* 任务页面骨架 */
.skeleton-task-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
}

/* 响应式 */
@media (max-width: 768px) {
  .skeleton-timer-ring {
    width: 240px;
    height: 240px;
  }

  .skeleton-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .skeleton-timer-ring {
    width: 200px;
    height: 200px;
  }

  .skeleton-grid {
    grid-template-columns: 1fr;
  }
}