/* 前台导航 */
.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: #475569;
  transition: color 0.15s;
  position: relative;
}
.nav-link:hover { color: #2563eb; }
.nav-link.active { color: #2563eb; }
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0; right: 0;
  height: 2px;
  background: #2563eb;
  border-radius: 9999px;
}
.mobile-nav-link {
  display: block;
  padding: 0.625rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #334155;
  transition: background 0.15s;
}
.mobile-nav-link:hover { background: #f1f5f9; }

/* Hero 渐变背景 */
.hero-gradient {
  background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 40%, #0284c7 100%);
}

/* 后台样式 */
.admin-nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}
.admin-nav-link:hover { background: #1e293b; color: #fff; }
.admin-nav-link.active { background: #2563eb; color: #fff; }

.admin-input {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 0.5rem;
  padding: 0.625rem 0.75rem;
  font-size: 0.875rem;
  outline: none;
  transition: box-shadow 0.15s;
}
.admin-input:focus {
  box-shadow: 0 0 0 2px #3b82f6;
  border-color: transparent;
}

.admin-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid #e2e8f0;
  font-size: 0.875rem;
  font-weight: 500;
  color: #334155;
  transition: all 0.15s;
}
.admin-action-btn:hover {
  border-color: #93c5fd;
  color: #1d4ed8;
  background: #eff6ff;
}

/* 文本截断 */
.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 卡片动画 */
.product-card {
  transform: translateY(0);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.product-card:hover { transform: translateY(-2px); }
.feature-card { transition: transform 0.2s ease; }
.feature-card:hover { transform: translateY(-3px); }

/* 网站备案号（工信部要求底部中央悬挂） */
.site-icp {
  text-align: center;
  padding-top: 0.25rem;
}
.site-icp a {
  color: #94a3b8;
  font-size: 0.875rem;
  text-decoration: none;
  transition: color 0.15s;
}
.site-icp a:hover {
  color: #fff;
  text-decoration: underline;
}