/* Student Projects Page Styles */
.minimal-posters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.minimal-poster {
  background: var(--background);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  border: 1px solid rgba(106, 13, 173, 0.1);
}

.minimal-poster:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(106, 13, 173, 0.15);
}

.poster-preview {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3/4;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 添加缩略图封面 */
.poster-cover {
  width: 100%;
  height: 100%;
  object-fit: fill;
  transition: transform 0.3s ease;
}

.minimal-poster:hover .poster-cover {
  transform: scale(1.05);
}

/* 如果封面图片加载失败，显示PDF图标作为后备 */
.pdf-icon {
  font-size: 4rem;
  color: white;
  opacity: 0.7;
  transition: all 0.3s ease;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.minimal-poster:hover .pdf-icon {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1.1);
}

.poster-hover {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 2;
}

.minimal-poster:hover .poster-hover {
  opacity: 1;
}

.hover-content {
  text-align: center;
  color: white;
}

.hover-content i {
  font-size: 2rem;
  margin-bottom: 10px;
  display: block;
}

.hover-content span {
  font-weight: var(--font-semibold);
  font-size: var(--font-size-sm);
}

.poster-meta {
  padding: 1.5rem;
}

.poster-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-bold);
  color: var(--primary-dark);
  margin-bottom: 0.5rem;
  line-height: 1.3;
  text-align: center;
}

.poster-author {
  font-size: var(--font-size-base);
  color: var(--text);
  margin-bottom: 1rem;
  font-weight: var(--font-medium);
  text-align: center;
}

.poster-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  justify-content: center;
}

.tag {
  background: var(--secondary);
  color: var(--primary);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-semibold);
  text-align: center;
  align-items: center;
  justify-content: center;
}

/* 全屏PDF查看器 - 修复关闭按钮位置 */
.pdf-viewer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  opacity: 0;
  transition: opacity 0.3s ease;
  /* 确保关闭按钮不会被裁剪 */
  overflow: visible;
}

.pdf-viewer.active {
  display: flex;
  opacity: 1;
}

.pdf-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0);
  backdrop-filter: blur(0);
  transition: all 0.3s ease;
}

.pdf-viewer.active .pdf-overlay {
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(5px);
}

.pdf-container {
  position: relative;
  width: 80%;
  height: 90vh;
  background: white;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  transform: scale(0.9);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  /* 确保容器不会裁剪外部元素 */
  overflow: visible;
}

.pdf-viewer.active .pdf-container {
  transform: scale(1);
  opacity: 1;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.pdf-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: #f5f5f5;
  overflow: auto;
  position: relative;
  border-radius: 8px;
}

.pdf-frame {
  width: 100%;
  height: 100%;
  border: none;
  background: white;
  transform: scale(1);
  transform-origin: top center;
  transition: transform 0.3s ease;
  border-radius: 8px;
}

/* 隐藏PDF工具栏和导航元素 */
.pdf-frame {
  /* 这些样式尝试隐藏浏览器PDF查看器UI */
  /* 注意：完全控制取决于浏览器和PDF设置 */
}

/* 嵌入PDF的特殊样式以隐藏控件 */
.pdf-frame[src*=".pdf"] {
  /* PDF iframe的附加样式 */
}

.pdf-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  text-align: center;
  z-index: 10002;
  display: none;
  background: rgba(0, 0, 0, 0.7);
  padding: 2rem;
  border-radius: 8px;
}

.pdf-loading.active {
  display: block;
}

.pdf-loading i {
  font-size: 2rem;
  margin-bottom: 10px;
  display: block;
  color: var(--primary);
}

/* 修复关闭按钮位置 - 确保在窗口外部 */
.pdf-close {
  position: absolute;
  top: -20px; /* 在容器外部 */
  right: -20px; /* 在容器外部 */
  background: rgba(255, 255, 255, 0.95);
  color: #333;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  font-size: var(--font-size-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  z-index: 10002; /* 确保在PDF容器上方 */
  opacity: 1;
  transform: scale(1);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.pdf-close:hover {
  background: rgba(255, 255, 255, 1);
  transform: scale(1.1) rotate(90deg);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.pdf-viewer.active .pdf-close {
  opacity: 1;
  transform: scale(1);
}

/* 下载按钮样式 */
.pdf-download {
  position: absolute;
  top: -20px;
  right: 30px; /* 放在关闭按钮左侧 */
  background: rgba(255, 255, 255, 0.95);
  color: #333;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  font-size: var(--font-size-base);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  z-index: 10002;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.pdf-download:hover {
  background: rgba(255, 255, 255, 1);
  transform: scale(1.1);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.pdf-controls {
  display: none;
}

.zoom-level {
  color: white;
  font-size: var(--font-size-sm);
  font-weight: var(--font-medium);
  min-width: 45px;
  text-align: center;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .minimal-posters-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
  }

  .pdf-viewer {
    padding: 1rem;
  }

  .pdf-container {
    width: 95%;
    height: 95vh;
  }

  .pdf-close {
    top: -15px;
    right: -15px;
    width: 35px;
    height: 35px;
    font-size: var(--font-size-base);
  }

  .pdf-download {
    top: -15px;
    right: 25px;
    width: 35px;
    height: 35px;
  }
}

@media (max-width: 480px) {
  .minimal-posters-grid {
    grid-template-columns: 1fr;
  }

  .poster-meta {
    padding: 1rem;
  }

  .poster-title {
    font-size: var(--font-size-base);
  }

  .pdf-container {
    width: 100%;
    height: 100vh;
    border-radius: 0;
  }

  .pdf-close {
    top: 10px; /* 在小屏幕上将按钮放在容器内部 */
    right: 10px;
    width: 35px;
    height: 35px;
    font-size: var(--font-size-base);
  }

  .pdf-download {
    top: 10px;
    right: 55px;
    width: 35px;
    height: 35px;
  }

  .pdf-viewer {
    padding: 0;
  }

  .pdf-controls {
    display: none;
  }
}

/* PDF查看器的打印样式 */
@media print {
  .pdf-viewer {
    display: none !important;
  }
}