/**
 * iGEM reusable component styles (plain CSS, no build step)
 * Theme: set CSS variables on html or .igem-theme
 */
:root,
.igem-theme {
  --igem-primary: #1e3a5f;
  --igem-accent: #3d7ea6;
  --igem-surface: #f4f7fb;
  --igem-muted: #64748b;
  --igem-text: #0f172a;
  --igem-border: #e2e8f0;
  --igem-radius: 0.75rem;
  --igem-font: system-ui, "Segoe UI", sans-serif;
  --igem-shadow: 0 4px 16px rgba(15, 23, 42, 0.06);
  --igem-shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.1);
  font-family: var(--igem-font);
}

/* =============================================================
   通用 Demo 卡片
   ============================================================= */
.igem-demo-card {
  padding: 1rem 1.15rem;
  background: #fff;
  border: 1px solid var(--igem-border);
  border-radius: var(--igem-radius);
  margin-bottom: 0.65rem;
  font-size: 0.88rem;
  color: var(--igem-text);
}

/* =============================================================
   1. Charts
   ============================================================= */
.igem-chart-wrap {
  position: relative;
  width: 100%;
  padding: 1rem 1.15rem;
  background: #fff;
  border: 1px solid var(--igem-border);
  border-radius: var(--igem-radius);
}
.igem-chart-wrap canvas { max-height: 360px; }

/* =============================================================
   2. Scroll animate
   ============================================================= */
[data-animate].igem-animate-pending { opacity: 0; }

/* Counter（数字计数） */
.igem-counter {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--igem-primary);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.igem-counter__unit {
  font-size: 0.45em;
  font-weight: 600;
  color: var(--igem-muted);
  margin-left: 0.2em;
}

/* Progress bar（进度条） */
.igem-progress {
  width: 100%;
  height: 10px;
  background: var(--igem-border);
  border-radius: 999px;
  overflow: hidden;
}
.igem-progress__bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--igem-primary), var(--igem-accent));
  border-radius: 999px;
  transition: width 0.4s ease;
}
.igem-progress__label {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--igem-muted);
  margin-bottom: 0.35rem;
}
.igem-progress__label strong { color: var(--igem-text); font-weight: 600; }

/* =============================================================
   3. Tabs
   ============================================================= */
/* A 胶囊（默认） */
.igem-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
  padding: 0.3rem;
  background: var(--igem-surface);
  border-radius: 999px;
  width: fit-content;
}
.igem-tabs__trigger {
  padding: 0.5rem 1.05rem;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--igem-muted);
  font-size: 0.86rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.igem-tabs__trigger:hover { color: var(--igem-text); }
.igem-tabs__trigger[aria-selected="true"],
.igem-tabs__trigger.is-active {
  background: var(--igem-primary);
  color: #fff;
}
.igem-tabs__panel { display: none; }
.igem-tabs__panel.is-active { display: block; }

/* B 下划线 */
.igem-tabs--underline .igem-tabs__list {
  background: transparent;
  border-radius: 0;
  border-bottom: 2px solid var(--igem-border);
  width: 100%;
  padding: 0;
  gap: 1.5rem;
}
.igem-tabs--underline .igem-tabs__trigger {
  border-radius: 0;
  background: transparent !important;
  color: var(--igem-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  padding: 0.65rem 0;
}
.igem-tabs--underline .igem-tabs__trigger[aria-selected="true"] {
  color: var(--igem-primary);
  border-bottom-color: var(--igem-primary);
  font-weight: 600;
}

/* C 垂直 Tab（左侧导航 + 右侧面板） */
.igem-tabs--vertical {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1.25rem;
}
.igem-tabs--vertical .igem-tabs__list {
  flex-direction: column;
  background: transparent;
  border-radius: 0;
  padding: 0;
  border-right: 1px solid var(--igem-border);
  width: auto;
  gap: 0;
}
.igem-tabs--vertical .igem-tabs__trigger {
  text-align: left;
  border-radius: 0;
  border-right: 2px solid transparent;
  margin-right: -1px;
  padding: 0.65rem 1rem;
}
.igem-tabs--vertical .igem-tabs__trigger[aria-selected="true"] {
  background: var(--igem-surface);
  color: var(--igem-primary);
  border-right-color: var(--igem-primary);
}
@media (max-width: 640px) {
  .igem-tabs--vertical { grid-template-columns: 1fr; }
  .igem-tabs--vertical .igem-tabs__list { flex-direction: row; border-right: none; border-bottom: 1px solid var(--igem-border); }
}

/* D 图标 Tab（带前缀图标） */
.igem-tabs--icon .igem-tabs__trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

/* E 卡片 Tab（每个面板是有边框的卡片） */
.igem-tabs--card .igem-tabs__list {
  background: transparent;
  border-radius: 0;
  padding: 0;
  width: 100%;
  gap: 0.35rem;
  border-bottom: 1px solid var(--igem-border);
  margin-bottom: 0;
}
.igem-tabs--card .igem-tabs__trigger {
  border-radius: 0.45rem 0.45rem 0 0;
  padding: 0.55rem 1.1rem;
  border: 1px solid transparent;
  border-bottom: none;
  margin-bottom: -1px;
  background: transparent;
}
.igem-tabs--card .igem-tabs__trigger[aria-selected="true"] {
  background: #fff;
  color: var(--igem-primary);
  border-color: var(--igem-border);
}
.igem-tabs--card .igem-tabs__panel.is-active {
  padding: 1.15rem;
  border: 1px solid var(--igem-border);
  border-top: none;
  border-radius: 0 0.6rem 0.6rem 0.6rem;
  background: #fff;
}

/* =============================================================
   4. Accordion
   ============================================================= */
.igem-accordion__item {
  border: 1px solid var(--igem-border);
  border-radius: var(--igem-radius);
  margin-bottom: 0.7rem;
  background: #fff;
  overflow: hidden;
  transition: border-color 0.2s;
}
.igem-accordion__item.is-open { border-color: var(--igem-primary); }
.igem-accordion__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 1.15rem;
  border: none;
  background: transparent;
  text-align: left;
  font-weight: 600;
  color: var(--igem-text);
  cursor: pointer;
  font-size: 0.92rem;
}
.igem-accordion__trigger:hover { background: var(--igem-surface); }
.igem-accordion__icon { transition: transform 0.3s; color: var(--igem-primary); flex-shrink: 0; }
.igem-accordion__item.is-open .igem-accordion__icon { transform: rotate(180deg); }
.igem-accordion__panel { overflow: hidden; }
.igem-accordion__content {
  padding: 0 1.15rem 1.15rem;
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--igem-muted);
}

/* B 卡片阴影 */
.igem-accordion--card .igem-accordion__item {
  box-shadow: var(--igem-shadow);
  border: none;
}

/* C 编号步骤式 */
.igem-accordion--numbered { counter-reset: igem-step; }
.igem-accordion--numbered .igem-accordion__trigger {
  counter-increment: igem-step;
  padding-left: 3.25rem;
  position: relative;
}
.igem-accordion--numbered .igem-accordion__trigger::before {
  content: counter(igem-step, decimal-leading-zero);
  position: absolute;
  left: 1.15rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--igem-accent);
  background: color-mix(in srgb, var(--igem-accent, #3d7ea6) 12%, #fff);
  padding: 0.18rem 0.45rem;
  border-radius: 0.3rem;
}

/* D FAQ 样式：题目前 Q. / 内容前 A. */
.igem-accordion--faq .igem-accordion__trigger {
  padding-left: 3.25rem;
  position: relative;
}
.igem-accordion--faq .igem-accordion__trigger::before {
  content: "Q";
  position: absolute;
  left: 1.15rem;
  top: 50%;
  transform: translateY(-50%);
  width: 26px; height: 26px;
  display: flex; align-items: center; justify-content: center;
  background: var(--igem-primary);
  color: #fff;
  font-weight: 800;
  border-radius: 50%;
  font-size: 0.78rem;
  font-family: ui-serif, Georgia, serif;
}
.igem-accordion--faq .igem-accordion__content {
  padding-left: 3.25rem;
  position: relative;
}
.igem-accordion--faq .igem-accordion__content::before {
  content: "A";
  position: absolute;
  left: 1.15rem;
  top: 0;
  width: 26px; height: 26px;
  display: flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--igem-accent, #3d7ea6) 18%, #fff);
  color: var(--igem-accent);
  font-weight: 800;
  border-radius: 50%;
  font-size: 0.78rem;
  font-family: ui-serif, Georgia, serif;
}

/* =============================================================
   5. Modal / Lightbox / Gallery
   ============================================================= */
.igem-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
}
.igem-modal.is-open { opacity: 1; pointer-events: auto; }
.igem-modal__backdrop { position: absolute; inset: 0; background: rgba(0, 0, 0, 0.82); }
.igem-modal__dialog { position: relative; z-index: 1; max-width: min(92vw, 1000px); }
.igem-modal__img {
  display: block;
  max-width: 100%;
  max-height: 85vh;
  object-fit: contain;
  border-radius: var(--igem-radius);
}
.igem-modal__close {
  position: absolute;
  top: -2.25rem;
  right: 0;
  border: none;
  background: transparent;
  color: #fff;
  cursor: pointer;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}
.igem-modal__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
.igem-modal__nav:hover { background: rgba(255, 255, 255, 0.3); }
.igem-modal__nav--prev { left: -3rem; }
.igem-modal__nav--next { right: -3rem; }
.igem-modal__counter {
  position: absolute;
  bottom: -2rem;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.78rem;
}
@media (max-width: 768px) {
  .igem-modal__nav--prev { left: 0.5rem; }
  .igem-modal__nav--next { right: 0.5rem; }
}

.igem-lightbox-trigger {
  cursor: zoom-in;
  border-radius: var(--igem-radius);
  transition: transform 0.2s, box-shadow 0.2s;
}
.igem-lightbox-trigger:hover {
  transform: scale(1.02);
  box-shadow: var(--igem-shadow);
}

/* C 图集网格 */
.igem-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.65rem;
}
.igem-gallery img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 0.5rem;
  cursor: zoom-in;
  transition: transform 0.2s, box-shadow 0.2s;
}
.igem-gallery img:hover { transform: scale(1.03); box-shadow: var(--igem-shadow); }

/* 视频灯箱包装（16:9） */
.igem-video-wrap {
  position: relative;
  width: min(90vw, 960px);
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--igem-radius);
  overflow: hidden;
}
.igem-video-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* 视频缩略图触发器（带 play 按钮） */
.igem-video-trigger {
  position: relative;
  display: inline-block;
  cursor: pointer;
  border-radius: var(--igem-radius);
  overflow: hidden;
  background: #000;
}
.igem-video-trigger img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
  transition: opacity 0.2s, transform 0.3s;
}
.igem-video-trigger:hover img { opacity: 1; transform: scale(1.03); }
.igem-video-trigger::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  transform: translate(-50%, -50%);
  pointer-events: none;
}
.igem-video-trigger::before {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  margin-left: 4px;
  width: 0; height: 0;
  border-left: 16px solid var(--igem-primary);
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  transform: translate(-50%, -50%);
  z-index: 1;
  pointer-events: none;
}

/* =============================================================
   6. Timeline
   ============================================================= */
.igem-timeline { position: relative; padding-left: 2rem; }
@media (min-width: 768px) {
  .igem-timeline { padding-left: 0; }
  .igem-timeline::before {
    content: "";
    position: absolute;
    left: 50%; top: 0; bottom: 0;
    width: 2px; background: var(--igem-border);
    transform: translateX(-50%);
  }
  .igem-timeline__item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2.5rem;
  }
  .igem-timeline__item:nth-child(odd) .igem-timeline__card { grid-column: 1; margin-right: 2rem; }
  .igem-timeline__item:nth-child(even) .igem-timeline__card { grid-column: 2; margin-left: 2rem; }
}
.igem-timeline__dot {
  position: absolute;
  left: 0;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--igem-primary);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--igem-border);
}
@media (min-width: 768px) {
  .igem-timeline__dot { left: 50%; transform: translateX(-50%); }
}
.igem-timeline__item { position: relative; margin-bottom: 1.5rem; }
.igem-timeline__card {
  margin-left: 1.5rem;
  padding: 1.15rem 1.3rem;
  background: #fff;
  border: 1px solid var(--igem-border);
  border-radius: var(--igem-radius);
}
@media (min-width: 768px) { .igem-timeline__card { margin-left: 0; } }
.igem-timeline__date {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--igem-accent);
  margin: 0 0 0.3rem;
}
.igem-timeline__title {
  font-size: 1.02rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
  color: var(--igem-text);
}
.igem-timeline__body { font-size: 0.86rem; color: var(--igem-muted); line-height: 1.6; }

/* B 左侧简约 */
.igem-timeline--simple::before {
  content: "";
  position: absolute;
  left: 6px; top: 0; bottom: 0;
  width: 2px; background: var(--igem-border);
}
.igem-timeline--simple .igem-timeline__item { display: block; }
.igem-timeline--simple .igem-timeline__card { margin-left: 1.75rem; }
.igem-timeline--simple .igem-timeline__dot {
  left: 0;
  transform: none;
}

/* C 横向时间轴 */
.igem-timeline--horizontal {
  display: flex;
  gap: 0;
  padding: 1rem 0 2rem;
  overflow-x: auto;
  position: relative;
}
.igem-timeline--horizontal::before {
  content: "";
  position: absolute;
  left: 1rem;
  right: 1rem;
  top: 1.85rem;
  height: 2px;
  background: var(--igem-border);
}
.igem-timeline--horizontal .igem-timeline__item {
  display: block;
  flex: 0 0 200px;
  margin: 0;
  text-align: center;
  position: relative;
}
.igem-timeline--horizontal .igem-timeline__dot {
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  margin-bottom: 1rem;
}
.igem-timeline--horizontal .igem-timeline__card {
  margin: 0;
  background: transparent;
  border: none;
  text-align: left;
  padding: 0.5rem 0.75rem;
}

/* =============================================================
   7. Stats（数字统计）
   ============================================================= */
.igem-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}
.igem-stats__item {
  padding: 1.25rem 1.15rem;
  background: #fff;
  border: 1px solid var(--igem-border);
  border-radius: var(--igem-radius);
  text-align: center;
}
.igem-stats__value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--igem-primary);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.igem-stats__label {
  font-size: 0.78rem;
  color: var(--igem-muted);
  margin-top: 0.35rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.igem-stats__unit { font-size: 0.5em; font-weight: 600; color: var(--igem-muted); margin-left: 0.15em; }

/* B 带图标 */
.igem-stats--icon .igem-stats__item {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-align: left;
}
.igem-stats--icon .igem-stats__icon {
  flex: 0 0 44px;
  width: 44px; height: 44px;
  border-radius: 0.65rem;
  background: color-mix(in srgb, var(--igem-primary, #1e3a5f) 12%, #fff);
  color: var(--igem-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

/* C 带边框强调 */
.igem-stats--accent .igem-stats__item {
  border-top: 3px solid var(--igem-primary);
}

/* D 带趋势 ▲ ▼ */
.igem-stats__trend {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  font-size: 0.78rem;
  font-weight: 600;
  margin-top: 0.4rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
}
.igem-stats__trend--up {
  background: rgba(22, 163, 74, 0.12);
  color: #15803d;
}
.igem-stats__trend--down {
  background: rgba(220, 38, 38, 0.12);
  color: #b91c1c;
}
.igem-stats__trend--flat {
  background: var(--igem-surface);
  color: var(--igem-muted);
}

/* =============================================================
   8. Callout（提示框 / 引用）
   ============================================================= */
.igem-callout {
  display: flex;
  gap: 0.85rem;
  padding: 0.95rem 1.15rem;
  border-radius: 0.6rem;
  border-left: 4px solid;
  margin-bottom: 0.85rem;
  background: var(--igem-surface);
}
.igem-callout__icon {
  flex: 0 0 22px;
  width: 22px; height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
}
.igem-callout__body { flex: 1; }
.igem-callout__title {
  font-size: 0.88rem;
  font-weight: 700;
  margin: 0 0 0.2rem;
}
.igem-callout__text { font-size: 0.85rem; color: var(--igem-text); margin: 0; line-height: 1.55; }

.igem-callout--info    { border-left-color: #0ea5e9; background: rgba(14,165,233,0.07); }
.igem-callout--info .igem-callout__icon, .igem-callout--info .igem-callout__title { color: #0c7aa8; }
.igem-callout--info .igem-callout__icon { background: #0ea5e9; color: #fff; }

.igem-callout--success { border-left-color: #16a34a; background: rgba(22,163,74,0.07); }
.igem-callout--success .igem-callout__title { color: #15803d; }
.igem-callout--success .igem-callout__icon { background: #16a34a; }

.igem-callout--warning { border-left-color: #f59e0b; background: rgba(245,158,11,0.09); }
.igem-callout--warning .igem-callout__title { color: #b45309; }
.igem-callout--warning .igem-callout__icon { background: #f59e0b; }

.igem-callout--danger  { border-left-color: #dc2626; background: rgba(220,38,38,0.07); }
.igem-callout--danger .igem-callout__title { color: #b91c1c; }
.igem-callout--danger .igem-callout__icon { background: #dc2626; }

/* 高亮强调框（关键结论） */
.igem-callout--highlight {
  background: color-mix(in srgb, var(--igem-accent) 8%, #fff);
  border-left-color: var(--igem-accent);
  padding: 1.25rem 1.5rem;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--igem-text);
  border-radius: 0 0.8rem 0.8rem 0;
}
.igem-callout--highlight strong { color: var(--igem-primary); }

/* Tip 简洁提示（用 ✎ 编辑图标占位） */
.igem-callout--tip { border-left-color: var(--igem-primary); background: color-mix(in srgb, var(--igem-primary) 5%, #fff); }
.igem-callout--tip .igem-callout__title { color: var(--igem-primary); }
.igem-callout--tip .igem-callout__icon { background: var(--igem-primary); }

/* Quote 样式 */
.igem-quote {
  position: relative;
  padding: 1.1rem 1.4rem 1.1rem 3rem;
  background: #fff;
  border: 1px solid var(--igem-border);
  border-left: 4px solid var(--igem-primary);
  border-radius: 0.5rem;
  font-style: italic;
  color: var(--igem-text);
  font-size: 0.95rem;
}
.igem-quote::before {
  content: "\201C";
  position: absolute;
  left: 0.7rem;
  top: 0.2rem;
  font-size: 2.6rem;
  font-family: Georgia, serif;
  color: var(--igem-primary);
  line-height: 1;
  font-style: normal;
}
.igem-quote__author {
  display: block;
  margin-top: 0.5rem;
  font-style: normal;
  font-size: 0.8rem;
  color: var(--igem-muted);
}
.igem-quote__author::before { content: "— "; }

/* =============================================================
   9. Steps（流程步骤）
   ============================================================= */
.igem-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.5rem;
  counter-reset: igem-step-num;
}
.igem-steps__item {
  position: relative;
  padding: 1.15rem 1rem 1.15rem 3.25rem;
  background: #fff;
  border: 1px solid var(--igem-border);
  border-radius: var(--igem-radius);
  counter-increment: igem-step-num;
}
.igem-steps__item::before {
  content: counter(igem-step-num);
  position: absolute;
  left: 1rem;
  top: 1.05rem;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--igem-primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.igem-steps__title { font-weight: 600; color: var(--igem-text); margin: 0 0 0.25rem; font-size: 0.92rem; }
.igem-steps__desc { font-size: 0.8rem; color: var(--igem-muted); margin: 0; line-height: 1.5; }

/* B 横向带连接线 */
.igem-steps--horizontal {
  display: flex;
  gap: 0;
  counter-reset: igem-step-num;
}
.igem-steps--horizontal .igem-steps__item {
  flex: 1;
  background: transparent;
  border: none;
  padding: 3.5rem 0.5rem 0;
  text-align: center;
  position: relative;
}
.igem-steps--horizontal .igem-steps__item::before {
  left: 50%;
  top: 0.5rem;
  transform: translateX(-50%);
  z-index: 1;
}
.igem-steps--horizontal .igem-steps__item:not(:last-child)::after {
  content: "";
  position: absolute;
  top: calc(0.5rem + 14px);
  left: calc(50% + 14px);
  right: calc(-50% + 14px);
  height: 2px;
  background: var(--igem-border);
}

/* =============================================================
   10. Team Members（团队成员卡片）
   ============================================================= */
.igem-members {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}
.igem-member {
  background: #fff;
  border: 1px solid var(--igem-border);
  border-radius: var(--igem-radius);
  overflow: hidden;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}
.igem-member:hover { transform: translateY(-4px); box-shadow: var(--igem-shadow-lg); }
.igem-member__img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: var(--igem-surface);
}
.igem-member__body { padding: 0.85rem; }
.igem-member__name { font-weight: 600; color: var(--igem-text); margin: 0; font-size: 0.92rem; }
.igem-member__role { font-size: 0.76rem; color: var(--igem-muted); margin: 0.2rem 0 0; }

/* B Flip 翻转卡片 */
.igem-member--flip {
  perspective: 1000px;
  background: transparent;
  border: none;
}
.igem-member--flip:hover { transform: none; box-shadow: none; }
.igem-member__inner {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}
.igem-member--flip:hover .igem-member__inner { transform: rotateY(180deg); }
.igem-member__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--igem-radius);
  overflow: hidden;
  border: 1px solid var(--igem-border);
  background: #fff;
}
.igem-member__face--back {
  transform: rotateY(180deg);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: left;
  background: var(--igem-primary);
  color: #fff;
}
.igem-member__face--back .igem-member__name { color: #fff; font-size: 1rem; }
.igem-member__face--back .igem-member__role { color: rgba(255,255,255,0.75); margin-bottom: 0.6rem; }
.igem-member__face--back p { font-size: 0.78rem; line-height: 1.55; color: rgba(255,255,255,0.9); margin: 0; }
.igem-member__face--front img { width: 100%; height: 100%; object-fit: cover; }
.igem-member__face--front .igem-member__caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 0.5rem 0.75rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: #fff;
  text-align: left;
  font-size: 0.85rem;
  font-weight: 600;
}

/* C 横向成员（照片左 + 详细信息右） */
.igem-members--wide {
  grid-template-columns: 1fr;
  gap: 0.85rem;
}
.igem-member--wide {
  display: grid;
  grid-template-columns: 120px 1fr;
  text-align: left;
  align-items: stretch;
}
.igem-member--wide:hover { transform: none; }
.igem-member--wide .igem-member__img {
  aspect-ratio: 1 / 1;
  height: 100%;
}
.igem-member--wide .igem-member__body { padding: 1rem 1.15rem; }
.igem-member--wide .igem-member__bio {
  font-size: 0.82rem;
  color: var(--igem-muted);
  line-height: 1.55;
  margin: 0.4rem 0 0;
}
.igem-member--wide .igem-member__tags {
  display: flex; flex-wrap: wrap; gap: 0.3rem;
  margin-top: 0.5rem;
}
.igem-member__tag {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  background: var(--igem-surface);
  border-radius: 999px;
  color: var(--igem-text);
}
@media (max-width: 540px) {
  .igem-member--wide { grid-template-columns: 1fr; }
  .igem-member--wide .igem-member__img { aspect-ratio: 4 / 3; }
}

/* =============================================================
   11. Hero（首屏/着陆区）
   ============================================================= */
.igem-hero {
  position: relative;
  padding: 4rem 1.5rem;
  background: color-mix(in srgb, var(--igem-primary) 8%, #fff);
  border-radius: var(--igem-radius);
  overflow: hidden;
}
.igem-hero__eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--igem-accent);
  margin: 0 0 0.85rem;
}
.igem-hero__title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 0.85rem;
  color: var(--igem-text);
  line-height: 1.15;
}
.igem-hero__title em {
  color: var(--igem-primary);
  font-style: normal;
  position: relative;
}
.igem-hero__title em::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0.05em;
  height: 0.35em;
  background: color-mix(in srgb, var(--igem-accent) 35%, transparent);
  z-index: -1;
}
.igem-hero__lead {
  font-size: 1rem;
  color: var(--igem-muted);
  line-height: 1.65;
  max-width: 60ch;
  margin: 0 0 1.5rem;
}
.igem-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* =============================================================
   12. Buttons（动作按钮，避免依赖 Bootstrap）
   ============================================================= */
.igem-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.6rem 1.2rem;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.igem-btn--primary { background: var(--igem-primary); color: #fff; }
.igem-btn--primary:hover { background: color-mix(in srgb, var(--igem-primary) 85%, #000); color: #fff; }
.igem-btn--ghost { background: transparent; color: var(--igem-primary); border-color: var(--igem-primary); }
.igem-btn--ghost:hover { background: color-mix(in srgb, var(--igem-primary) 10%, transparent); }
.igem-btn--link { background: transparent; color: var(--igem-primary); padding-left: 0; padding-right: 0; }
.igem-btn--link:hover { text-decoration: underline; }

/* =============================================================
   13. Tables
   ============================================================= */
.igem-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--igem-radius);
  border: 1px solid var(--igem-border);
}
.igem-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: #fff;
}
.igem-table caption {
  caption-side: top;
  text-align: left;
  font-weight: 600;
  padding: 0.75rem 1rem;
  color: var(--igem-text);
  border-bottom: 1px solid var(--igem-border);
}
.igem-table th,
.igem-table td {
  padding: 0.65rem 1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--igem-border);
}
.igem-table th {
  font-weight: 600;
  color: var(--igem-text);
  background: var(--igem-surface);
  white-space: nowrap;
}
.igem-table tbody tr:last-child td { border-bottom: none; }
.igem-table--striped tbody tr:nth-child(even) { background: color-mix(in srgb, var(--igem-surface) 80%, #fff); }
.igem-table--bordered th,
.igem-table--bordered td { border: 1px solid var(--igem-border); }
.igem-table--compact th,
.igem-table--compact td { padding: 0.4rem 0.65rem; font-size: 0.82rem; }
.igem-table--compare th:first-child,
.igem-table--compare td:first-child {
  font-weight: 600;
  background: var(--igem-surface);
  width: 28%;
}
.igem-table--compare .is-highlight {
  background: color-mix(in srgb, var(--igem-accent) 12%, #fff);
  font-weight: 600;
  color: var(--igem-primary);
}
.igem-table__badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--igem-primary) 12%, #fff);
  color: var(--igem-primary);
}

/* =============================================================
   14. ECharts container
   ============================================================= */
.igem-echart-wrap {
  width: 100%;
  min-height: 240px;
  border-radius: var(--igem-radius);
  border: 1px solid var(--igem-border);
  background: #fff;
  padding: 0.5rem;
}
.igem-chart-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.8rem;
}
.igem-chart-picker__item {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--igem-border);
  background: var(--igem-surface);
  color: var(--igem-muted);
}
.igem-chart-picker__item strong { color: var(--igem-text); }

/* =============================================================
   15. Font showcase (typography picker)
   ============================================================= */
.igem-font-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}
.igem-font-card {
  border: 1px solid var(--igem-border);
  border-radius: var(--igem-radius);
  padding: 1.25rem 1.35rem;
  background: #fff;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.igem-font-card:hover {
  border-color: color-mix(in srgb, var(--igem-primary) 35%, var(--igem-border));
  box-shadow: var(--igem-shadow);
}
.igem-font-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--igem-border);
}
.igem-font-card__name {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--igem-accent);
  margin: 0;
}
.igem-font-card__stack {
  font-size: 0.7rem;
  color: var(--igem-muted);
  font-family: ui-monospace, "JetBrains Mono", monospace;
  margin: 0;
  text-align: right;
}
.igem-font-card__sample-h {
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--igem-text);
  margin: 0 0 0.5rem;
}
.igem-font-card__sample-sub {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--igem-primary);
  margin: 0 0 0.65rem;
}
.igem-font-card__sample-body {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--igem-muted);
  margin: 0;
}
.igem-font-card__use {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--igem-muted);
}
.igem-font-card__use code {
  font-size: 0.72rem;
  background: var(--igem-surface);
  padding: 0.1rem 0.35rem;
  border-radius: 0.25rem;
}

/* =============================================================
   16. Reading progress
   ============================================================= */
.igem-reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1040;
  background: color-mix(in srgb, var(--igem-border) 60%, transparent);
  pointer-events: none;
}
.igem-reading-progress__bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--igem-primary), var(--igem-accent));
  transition: width 0.12s ease-out;
}

/* =============================================================
   17. Sticky TOC
   ============================================================= */
.igem-layout-toc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}
@media (min-width: 992px) {
  .igem-layout-toc {
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: start;
  }
}
.igem-toc {
  display: none;
}
@media (min-width: 992px) {
  .igem-toc {
    display: block;
    position: sticky;
    top: 1.25rem;
    max-height: calc(100vh - 2.5rem);
    overflow-y: auto;
    padding: 1rem 0;
  }
}
.igem-toc__title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--igem-muted);
  margin: 0 0 0.65rem;
  padding: 0 0.5rem;
}
.igem-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.igem-toc__link {
  display: block;
  padding: 0.35rem 0.5rem;
  font-size: 0.82rem;
  color: var(--igem-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 0.35rem 0.35rem 0;
  line-height: 1.4;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.igem-toc__link:hover {
  color: var(--igem-primary);
  background: color-mix(in srgb, var(--igem-primary) 6%, transparent);
}
.igem-toc__link.is-active {
  color: var(--igem-primary);
  font-weight: 600;
  border-left-color: var(--igem-accent);
  background: color-mix(in srgb, var(--igem-accent) 10%, transparent);
}
.igem-toc--mobile {
  display: block;
  margin-bottom: 1.5rem;
  padding: 0.85rem 1rem;
  background: var(--igem-surface);
  border: 1px solid var(--igem-border);
  border-radius: var(--igem-radius);
}
@media (min-width: 992px) {
  .igem-toc--mobile { display: none; }
}

/* =============================================================
   18. Before / after compare
   ============================================================= */
.igem-compare {
  position: relative;
  width: 100%;
  max-width: 640px;
  aspect-ratio: 4 / 3;
  border-radius: var(--igem-radius);
  overflow: hidden;
  border: 1px solid var(--igem-border);
  user-select: none;
  --igem-compare: 50%;
}
.igem-compare__after,
.igem-compare__before {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
}
.igem-compare__before {
  z-index: 2;
}
.igem-compare__after {
  z-index: 1;
}
.igem-compare__slider {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: ew-resize;
  z-index: 4;
}
.igem-compare__handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--igem-compare, 50%);
  width: 3px;
  margin-left: -1.5px;
  background: #fff;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.25);
  z-index: 3;
  pointer-events: none;
}
.igem-compare__handle::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #fff;
  box-shadow: var(--igem-shadow);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%231e3a5f' stroke-width='2'%3E%3Cpath d='M8 8l-4 4 4 4M16 16l4-4-4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}
.igem-compare__label {
  position: absolute;
  top: 0.65rem;
  z-index: 5;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 0.25rem;
  background: rgba(15, 23, 42, 0.65);
  color: #fff;
  pointer-events: none;
}
.igem-compare__label--before { left: 0.65rem; }
.igem-compare__label--after { right: 0.65rem; }

/* =============================================================
   19. Back to top
   ============================================================= */
.igem-back-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 1030;
  padding: 0.55rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--igem-border);
  border-radius: 999px;
  background: #fff;
  color: var(--igem-primary);
  box-shadow: var(--igem-shadow);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
}
.igem-back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.igem-back-top:hover {
  background: var(--igem-primary);
  color: #fff;
  border-color: var(--igem-primary);
}

/* =============================================================
   20. Chart fallback
   ============================================================= */
.igem-chart-wrap--error,
.igem-echart-wrap.igem-chart-wrap--error {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
  background: var(--igem-surface);
}
.igem-chart-fallback {
  margin: 0;
  padding: 1rem;
  font-size: 0.85rem;
  color: var(--igem-muted);
  text-align: center;
  line-height: 1.55;
}
.igem-chart-fallback code {
  font-size: 0.8rem;
  background: #fff;
  padding: 0.1rem 0.35rem;
  border-radius: 0.2rem;
}

/* =============================================================
   Reduced motion
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  .igem-animate-pending,
  .igem-timeline__card {
    opacity: 1 !important;
    transform: none !important;
    filter: none !important;
  }
  .igem-reading-progress__bar {
    transition: none;
  }
  .igem-back-top {
    transition: none;
  }
}