/* 媒体中心页面增强样式 - 基于恒歌科技"资源中心"页面 */

/* 二级导航 */
.media-nav {
  background: #fff;
  margin-bottom: 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.media-nav .m {
  padding: 0;
}

.media-nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.media-nav ul li {
  position: relative;
  z-index: 1;
  cursor: pointer;
  flex: 0 0 auto;
}

.media-nav ul li:before {
  content: "";
  display: block;
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: #2659FF;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 0;
}

.media-nav ul li a {
  position: relative;
  z-index: 1;
  line-height: 3.75rem;
  padding: 0 2.5rem;
  display: block;
  color: #3D3D3D;
  font-size: 1.125rem;
  transition: color 0.3s;
  text-decoration: none;
  white-space: nowrap;
}

.media-nav ul li.on:before {
  opacity: 1;
}

.media-nav ul li.on a {
  color: #fff;
}

/* 下载卡片网格 */
.media-downloads {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.875rem 1.25rem;
  list-style: none;
  margin: 2rem 0 0 0;
  padding: 0;
}

.media-downloads li .box {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  height: 17.5rem;
  overflow: hidden;
  transition: all 0.3s;
}

.media-downloads li .box:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  transform: translateY(-4px);
}

.media-downloads li .box .txt {
  padding: 2rem 1.875rem;
  height: 12.5rem;
}

.media-downloads li .box .txt .tt {
  display: flex;
  align-items: flex-start;
  margin-bottom: 1rem;
  gap: 0.625rem;
}

.media-downloads li .box .txt .tt i {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(38, 89, 255, 0.1);
  border-radius: 6px;
}

.media-downloads li .box .txt .tt i img {
  width: 20px;
  height: 20px;
}

.media-downloads li .box .txt .tt h4 {
  color: #3D3D3D;
  font-size: 1.125rem;
  line-height: 1.4;
  font-weight: bold;
  margin: 0;
}

.media-downloads li .box .txt p {
  font-size: 0.875rem;
  color: #3D3D3D;
  opacity: 0.6;
  line-height: 1.6;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.media-downloads li .box .bot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 5.5rem;
  padding: 0 1.875rem;
  background: var(--c-bg-alt);
  border-top: 1px solid var(--c-border);
}

.media-downloads li .box .bot .tag {
  background: transparent;
  color: #3D3D3D;
  opacity: 0.5;
  font-size: 0.875rem;
  padding: 0;
}

.media-downloads li .box .bot .btn-download {
  background: #2659FF;
  color: #fff;
  border-radius: 1.25rem;
  font-size: 0.875rem;
  height: 2.5rem;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 0.3s;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-weight: 500;
}

.media-downloads li .box .bot .btn-download.disabled {
  background: #ECEEF2;
  color: #3D3D3D;
  opacity: 0.6;
  pointer-events: none;
  cursor: not-allowed;
}

.media-downloads li .box .bot .btn-download:hover:not(.disabled) {
  background: #1a47cc;
  transform: translateY(-1px);
}

/* 技术文章卡片 */
.media-articles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.875rem 1.25rem;
  list-style: none;
  margin: 2rem 0 0 0;
  padding: 0;
}

.media-articles li .box {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 2rem 1.75rem;
  height: 100%;
  min-height: 12rem;
  cursor: pointer;
  transition: all 0.3s;
}

.media-articles li .box:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  transform: translateY(-4px);
  border-color: var(--c-blue);
}

.media-articles li .box .txt .tt {
  display: flex;
  align-items: center;
  margin-bottom: 0.875rem;
  gap: 0.75rem;
}

.media-articles li .box .txt .tt i {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(38, 89, 255, 0.1);
  border-radius: 6px;
}

.media-articles li .box .txt .tt i img {
  width: 20px;
  height: 20px;
}

.media-articles li .box .txt .tt .tag {
  background: linear-gradient(106deg, #53D7E5 0%, #2659FF 99%);
  color: #fff;
  padding: 0.3rem 0.875rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
}

.media-articles li .box .txt h4 {
  color: #3D3D3D;
  font-size: 1.125rem;
  font-weight: bold;
  margin: 0 0 0.75rem 0;
  line-height: 1.4;
}

.media-articles li .box .txt p {
  font-size: 0.875rem;
  color: #3D3D3D;
  opacity: 0.65;
  line-height: 1.7;
  margin: 0;
}

/* 筛选按钮 */
.download-filters {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.download-filters .filter-btn {
  position: relative;
  background: #fff;
  border: 1px solid var(--c-border);
  line-height: 2.5rem;
  height: 2.5rem;
  padding: 0 1.5rem;
  color: #3D3D3D;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.3s;
  border-radius: 1.25rem;
  overflow: hidden;
  z-index: 1;
}

.download-filters .filter-btn:before {
  content: "";
  position: absolute;
  inset: 0;
  background: #2659FF;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}

.download-filters .filter-btn.active {
  color: #fff;
  border-color: #2659FF;
}

.download-filters .filter-btn.active:before {
  opacity: 1;
}

.download-filters .filter-btn:hover:not(.active) {
  border-color: #2659FF;
  color: #2659FF;
}

/* Tab面板切换 */
.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* 响应式布局 */
@media (max-width: 1024px) {
  .media-downloads,
  .media-articles {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .media-nav ul {
    flex-wrap: wrap;
  }

  .media-nav ul li a {
    padding: 0 1.5rem;
    line-height: 3rem;
    font-size: 1rem;
  }

  .media-downloads,
  .media-articles {
    grid-template-columns: 1fr;
  }

  .media-downloads li .box {
    height: auto;
  }

  .media-downloads li .box .txt {
    height: auto;
  }
}