/**
 * 百鸣软件 — 全站通用组件（骨架屏、空状态、信任条、返回顶部等）
 */

/* —— 跳过导航 —— */
.bm-skip-link {
  position: absolute;
  left: -9999px;
  top: 0.75rem;
  z-index: 10000;
  padding: 0.5rem 1rem;
  background: var(--bm-brand);
  color: #fff;
  font-weight: 600;
  font-size: var(--bm-text-sm);
  border-radius: var(--bm-radius-sm);
  text-decoration: none;
}

.bm-skip-link:focus {
  left: 0.75rem;
  outline: 2px solid var(--bm-text);
  outline-offset: 2px;
}

/* —— Hero 信任条 —— */
.bm-trust-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1rem;
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
  padding-top: 0;
  border-top: none;
}

.bm-trust-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: var(--bm-text-sm);
  color: var(--bm-text-secondary);
  font-weight: 500;
}

.bm-trust-item i {
  color: var(--bm-brand);
  font-size: 0.95em;
}

/* —— 区块底部 CTA —— */
.bm-section-foot {
  text-align: center;
  margin-top: clamp(2rem, 5vw, 2.75rem);
}

.bm-btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  font-size: var(--bm-text-sm);
  font-weight: 600;
  color: var(--bm-brand);
  background: var(--bm-brand-subtle);
  border: 1px solid var(--bm-brand-muted);
  border-radius: var(--bm-radius-pill);
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.bm-btn-ghost:hover {
  color: #fff;
  background: var(--bm-brand);
  border-color: var(--bm-brand);
}

.bm-btn-ghost:focus-visible {
  outline: 2px solid var(--bm-brand);
  outline-offset: 2px;
}

.bm-btn-ghost.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: var(--bm-text-xs);
}

/* —— 骨架屏 —— */
.bm-skeleton {
  pointer-events: none;
}

.bm-skeleton-block {
  background: linear-gradient(
    90deg,
    var(--bm-surface-section) 0%,
    var(--bm-surface-alt) 45%,
    var(--bm-surface-section) 90%
  );
  background-size: 200% 100%;
  animation: bm-shimmer 1.2s ease-in-out infinite;
  border-radius: var(--bm-radius-sm);
}

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

.bm-skeleton-card {
  background: var(--bm-surface-card);
  border: 1px solid var(--bm-border-light);
  border-radius: var(--bm-radius-lg);
  padding: 1.5rem 1.25rem;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.bm-skeleton-card--platform .bm-skeleton-circle {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--bm-radius-md);
  margin-bottom: 1rem;
}

.bm-skeleton-card--software {
  padding: 0;
  overflow: hidden;
}

.bm-skeleton-card--software .bm-skeleton-thumb {
  width: 100%;
  aspect-ratio: 4 / 3;
  max-height: 160px;
  border-radius: 0;
}

.bm-skeleton-card--software .bm-skeleton-body {
  padding: 1rem;
  width: 100%;
}

.bm-skeleton-line {
  height: 0.75rem;
  margin-bottom: 0.5rem;
  width: 100%;
}

.bm-skeleton-line--short {
  width: 55%;
}

.bm-skeleton-line--title {
  height: 1rem;
  width: 70%;
  margin-bottom: 0.65rem;
}

/* —— 卡片角标 —— */
.software-card .bm-card-badge {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 2;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.2rem 0.45rem;
  border-radius: var(--bm-radius-sm);
  background: var(--bm-brand);
  color: #fff;
  line-height: 1.2;
}

.software-card .bm-card-platform {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  z-index: 2;
  font-size: var(--bm-text-xs);
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--bm-radius-pill);
  background: rgba(255, 255, 255, 0.92);
  color: var(--bm-text-secondary);
  border: 1px solid var(--bm-border-light);
  max-width: 45%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* —— 空状态 / 错误态 —— */
.bm-state-box {
  text-align: center;
  padding: 2.5rem 1.5rem;
  background: var(--bm-surface-card);
  border: 1px dashed var(--bm-border-light-strong);
  border-radius: var(--bm-radius-lg);
  color: var(--bm-text-muted);
}

.bm-state-box i {
  font-size: 2rem;
  color: var(--bm-text-muted);
  margin-bottom: 0.75rem;
  opacity: 0.7;
}

.bm-state-box p {
  margin-bottom: 1rem;
  font-size: var(--bm-text-md);
}

.bm-state-box--error {
  border-color: rgba(220, 38, 38, 0.25);
  background: #fef2f2;
  color: #991b1b;
}

.bm-state-box--error i {
  color: #dc2626;
}

/* —— 返回顶部 —— */
.bm-back-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 1040;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--bm-border-light-strong);
  border-radius: var(--bm-radius-md);
  background: var(--bm-surface-card);
  color: var(--bm-text-secondary);
  box-shadow: var(--bm-shadow-md);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.bm-back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.bm-back-top:hover {
  background: var(--bm-brand);
  color: #fff;
  border-color: var(--bm-brand);
}

.bm-back-top:focus-visible {
  outline: 2px solid var(--bm-brand);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .bm-skeleton-block {
    animation: none;
    background: var(--bm-surface-section);
  }

  .bm-back-top {
    transition: none;
  }
}