/* ============================================================
 * 加载态样式
 *
 * spinner / 骨架屏 / 顶部进度条 / 按钮内加载态.
 * 口径: 纯切分, 选择器与声明逐字节不变. 由 dashboard/index.html 依次加载
 * (base -> loading -> views; 后者依赖前者的主题变量与基础类).
 * ============================================================ */

/* ---------- spinner / loading ---------- */
.spinner {
  display: inline-block;
  width: 16px; height: 16px;
  border: 2px solid var(--border2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: -3px;
  flex: 0 0 auto;
}
.spinner.lg { width: 26px; height: 26px; border-width: 3px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* 骨架屏 */
.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--bg3);
  border-radius: 6px;
  min-height: 14px;
}
.skeleton::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .06), transparent);
  animation: shimmer 1.4s infinite;
}
@keyframes shimmer { from { transform: translateX(-100%); } to { transform: translateX(100%); } }

/* 加载进度条（顶部） */
.progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2), var(--accent3));
  z-index: 100;
  box-shadow: 0 0 12px rgba(91, 140, 255, .6);
  transition: width .25s var(--ease), opacity .4s;
}
.progress-bar.done { opacity: 0; }

/* 按钮内加载态 */
.btn-loading { pointer-events: none; opacity: .7; }
.btn-loading .spinner { border-color: rgba(255,255,255,.35); border-top-color: #fff; }