:root {
  --purple: #534AB7;
  --purple-light: #EEEDFE;
  --purple-border: #AFA9EC;
}

.purple-sub { color: var(--purple) !important; }

.tag-purple-hero { background: #EEEDFE; color: #3C3489; }

.purple-banner {
  background: var(--white);
  border: 1px solid var(--purple-border);
  border-left: 4px solid var(--purple);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.6rem 2rem;
  animation: fadeUp 0.7s 0.2s ease both;
}

.purple-banner .project-banner-title { color: var(--black); }
.purple-banner .project-banner-role { color: #555; }

.purple-heading::before { background: var(--purple) !important; }

.detail-list li { border-left-color: var(--purple) !important; }
.detail-list li strong { color: var(--black); }

.purple-metric .metric-num { color: var(--purple) !important; }
.purple-metric::before { background: var(--purple) !important; }

/* PPT 翻页器 */
.ppt-viewer { display: flex; flex-direction: column; gap: 1rem; }

.ppt-main {
  display: flex; align-items: center; gap: 1rem;
}

.ppt-img-wrap {
  flex: 1; position: relative; cursor: pointer;
  border: 1px solid var(--purple-border);
  border-radius: var(--radius); overflow: hidden;
}

.ppt-img-wrap img {
  width: 100%; display: block;
  transition: opacity 0.2s;
}

.ppt-img-wrap:hover img { opacity: 0.92; }

.ppt-zoom-hint {
  position: absolute; bottom: 10px; right: 12px;
  font-size: 0.75rem; color: #fff;
  background: rgba(83,74,183,0.7);
  padding: 3px 10px; border-radius: 100px;
  pointer-events: none;
}

.ppt-btn {
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--purple-border);
  background: var(--white); color: var(--purple);
  font-size: 1.4rem; cursor: pointer; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s, color 0.2s;
}

.ppt-btn:hover { background: var(--purple); color: #fff; }

.ppt-counter {
  text-align: center; font-size: 0.85rem; color: var(--gray);
}

.ppt-counter span { color: var(--purple); font-weight: 500; }

.ppt-thumbs {
  display: flex; gap: 8px;
  overflow-x: auto; padding-bottom: 6px;
  scrollbar-width: thin;
}

.ppt-thumbs img {
  width: 80px; height: 52px; object-fit: cover;
  border-radius: 6px; cursor: pointer; flex-shrink: 0;
  border: 2px solid transparent;
  transition: border-color 0.2s, opacity 0.2s;
  opacity: 0.6;
}

.ppt-thumbs img:hover { opacity: 0.9; }
.ppt-thumbs img.active { border-color: var(--purple); opacity: 1; }

/* 灯箱 */
.lightbox {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.88); z-index: 1000;
  align-items: center; justify-content: center; padding: 2rem;
}
.lightbox.active { display: flex; }
.lightbox img { max-width: 92%; max-height: 92vh; border-radius: 8px; object-fit: contain; }
.lightbox-close {
  position: fixed; top: 1.5rem; right: 2rem;
  color: #fff; font-size: 1.5rem; cursor: pointer;
  opacity: 0.7; transition: opacity 0.2s;
}
.lightbox-close:hover { opacity: 1; }