.spr-root {
  --spr-paper: #f8f6f1;
  --spr-surface: #fffdf9;
  --spr-ink: #242721;
  --spr-muted: #6d7068;
  --spr-line: rgba(36, 39, 33, 0.14);
  --spr-accent: #a66f4f;
  --spr-accent-soft: #ead9ca;
  --spr-forest: #263a32;
  --spr-shadow: 0 24px 70px rgba(35, 37, 31, 0.12);
  color: var(--spr-ink);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.6;
  min-width: 0;
  position: relative;
}

.spr-root,
.spr-root * {
  box-sizing: border-box;
}

.spr-root button,
.spr-root input,
.spr-root a {
  font: inherit;
}

.spr-root button:focus-visible,
.spr-root a:focus-visible,
.spr-root input:focus-visible,
.spr-root [tabindex]:focus-visible {
  outline: 3px solid #3478c5;
  outline-offset: 3px;
}

.spr-toolbar {
  align-items: center;
  backdrop-filter: blur(18px);
  background: rgba(248, 246, 241, 0.94);
  border: 1px solid var(--spr-line);
  border-radius: 18px;
  display: flex;
  gap: 18px;
  margin: 0 auto 18px;
  max-width: 1440px;
  padding: 12px 16px;
  position: sticky;
  top: 12px;
  z-index: 20;
}

.spr-toolbar-title {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.04em;
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.spr-directory {
  display: flex;
  gap: 7px;
  min-width: 0;
  overflow-x: auto;
  padding: 3px;
  scrollbar-width: thin;
}

.spr-mobile-directory {
  align-items: center;
  display: none;
  justify-content: space-between;
}

.spr-mobile-current {
  font-size: 13px;
  font-weight: 700;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.spr-mobile-toggle {
  background: var(--spr-forest);
  border: 0;
  border-radius: 999px;
  color: #fff;
  cursor: pointer;
  flex: 0 0 auto;
  font-size: 13px;
  min-height: 44px;
  padding: 10px 15px;
}

.spr-directory-item,
.spr-nav-button,
.spr-secondary-button {
  background: transparent;
  border: 1px solid var(--spr-line);
  border-radius: 999px;
  color: var(--spr-muted);
  cursor: pointer;
  flex: 0 0 auto;
  font-size: 13px;
  min-height: 38px;
  padding: 8px 13px;
}

.spr-directory-item.is-selected,
.spr-nav-button:hover,
.spr-secondary-button:hover {
  background: var(--spr-forest);
  border-color: var(--spr-forest);
  color: #fff;
}

.spr-deck {
  display: grid;
  gap: 28px;
  margin: 0 auto;
  max-width: 1440px;
}

.spr-chapter {
  background: var(--spr-paper);
  border: 1px solid var(--spr-line);
  border-radius: 28px;
  box-shadow: var(--spr-shadow);
  min-height: min(820px, calc(100vh - 96px));
  overflow: hidden;
  padding: clamp(28px, 4.5vw, 68px);
  position: relative;
  scroll-margin-top: 88px;
}

.spr-chapter-header {
  align-items: end;
  display: flex;
  justify-content: space-between;
  margin-bottom: 34px;
  position: relative;
  z-index: 2;
}

.spr-heading {
  max-width: 900px;
}

.spr-eyebrow {
  color: var(--spr-accent);
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.spr-title {
  font-family: Georgia, "Songti SC", serif;
  font-size: clamp(36px, 4.8vw, 68px);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin: 0;
}

.spr-subtitle {
  color: var(--spr-muted);
  font-size: clamp(14px, 1.4vw, 18px);
  line-height: 1.75;
  margin: 14px 0 0;
  max-width: 760px;
}

.spr-lead {
  color: #41443e;
  font-family: Georgia, "Songti SC", serif;
  font-size: clamp(18px, 2vw, 28px);
  line-height: 1.72;
  margin: 0;
}

.spr-cover {
  align-items: flex-end;
  background:
    radial-gradient(circle at 78% 22%, rgba(187, 151, 114, 0.35), transparent 34%),
    linear-gradient(135deg, #19241f, #34473d);
  color: #fff;
  display: flex;
  isolation: isolate;
  min-height: min(880px, calc(100vh - 68px));
  overflow: hidden;
}

.spr-cover::after {
  background:
    linear-gradient(90deg, rgba(17, 26, 22, 0.88), rgba(17, 26, 22, 0.12) 70%),
    linear-gradient(0deg, rgba(17, 26, 22, 0.56), transparent 52%);
  content: "";
  inset: 0;
  pointer-events: none;
  position: absolute;
  z-index: -1;
}

.spr-cover-image {
  height: 100%;
  inset: 0;
  object-fit: cover;
  position: absolute;
  transform: scale(1.001);
  width: 100%;
  z-index: -2;
}

.spr-cover-copy {
  align-items: flex-start;
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-width: min(920px, 78%);
  position: relative;
  z-index: 1;
}

.spr-cover .spr-eyebrow {
  color: rgba(255, 255, 255, 0.66);
}

.spr-cover .spr-title {
  font-size: clamp(54px, 8vw, 112px);
  line-height: 0.98;
  margin: 0;
  max-width: 11em;
}

.spr-cover-lead {
  color: rgba(255, 255, 255, 0.82);
  font-family: Georgia, "Songti SC", serif;
  font-size: clamp(17px, 1.7vw, 23px);
  line-height: 1.65;
  margin: 0;
  max-width: 680px;
}

.spr-cover-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 2px 0 0;
}

.spr-cover-meta-item {
  display: grid;
  gap: 4px;
  min-width: 92px;
}

.spr-cover-meta dt {
  color: rgba(255, 255, 255, 0.58);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.spr-cover-meta dd {
  color: rgba(255, 255, 255, 0.92);
  font-size: 15px;
  margin: 0;
}

.spr-cover-enter {
  align-items: center;
  background: rgba(251, 249, 244, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 999px;
  color: #20332b;
  cursor: pointer;
  display: inline-flex;
  font-size: 14px;
  font-weight: 700;
  justify-content: center;
  margin-top: 2px;
  min-height: 46px;
  padding: 11px 22px;
}

.spr-cover-enter::after {
  content: "→";
  font-size: 18px;
  margin-left: 12px;
  transition: transform 180ms ease;
}

.spr-cover-enter:hover::after,
.spr-cover-enter:focus-visible::after {
  transform: translateX(4px);
}

.spr-cover-enter:focus-visible {
  outline: 3px solid rgba(255, 255, 255, 0.74);
  outline-offset: 4px;
}

.spr-narrative-grid,
.spr-concept-intro,
.spr-focus-layout,
.spr-hotspot-layout,
.spr-evidence-layout {
  display: grid;
  gap: 28px;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
}

.spr-prose {
  display: grid;
  gap: 22px;
}

.spr-narrative-items {
  display: grid;
  gap: 28px;
}

.spr-narrative-item {
  align-items: center;
  display: grid;
  gap: clamp(24px, 4vw, 68px);
  grid-template-columns: minmax(0, .86fr) minmax(340px, 1.14fr);
  min-height: 420px;
}

.spr-narrative-item:nth-child(even) {
  grid-template-columns: minmax(340px, 1.14fr) minmax(0, .86fr);
}

.spr-narrative-item:nth-child(even) .spr-narrative-copy {
  order: 2;
}

.spr-narrative-item .spr-media {
  min-height: 380px;
}

.spr-client-quote {
  border-left: 2px solid var(--spr-accent);
  color: var(--spr-muted);
  font-family: "SimSun", "Songti SC", serif;
  font-size: 18px;
  line-height: 1.75;
  margin: 24px 0 0;
  padding: 18px 0 18px 20px;
}

.spr-overall-layout {
  align-items: center;
  display: grid;
  gap: clamp(24px, 4vw, 64px);
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr);
}

.spr-overall-layout > .spr-media {
  min-height: 520px;
}

.spr-concept-principles {
  counter-reset: concept;
  display: grid;
  gap: 14px;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.spr-concept-principles li {
  border-top: 1px solid var(--spr-line);
  counter-increment: concept;
  padding: 16px 0;
}

.spr-concept-principles li::before {
  color: var(--spr-accent);
  content: counter(concept, decimal-leading-zero);
  display: block;
  font-size: 12px;
  letter-spacing: .12em;
  margin-bottom: 7px;
}

.spr-next-groups {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.spr-next-group {
  background: rgba(255, 255, 255, .58);
  border: 1px solid var(--spr-line);
  border-radius: 24px;
  padding: clamp(20px, 3vw, 34px);
}

.spr-evidence-item-title {
  font-family: "SimSun", "Songti SC", serif;
  font-size: 22px;
  margin: 8px 0 4px;
}

.spr-evidence-item-description {
  color: var(--spr-muted);
  line-height: 1.7;
  margin: 0 0 18px;
}

.spr-thread-list {
  counter-reset: spr-thread;
  display: grid;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.spr-thread-list li {
  align-items: center;
  background: var(--spr-surface);
  border: 1px solid var(--spr-line);
  border-radius: 15px;
  display: flex;
  gap: 12px;
  padding: 14px 17px;
}

.spr-thread-list li::before {
  color: var(--spr-accent);
  content: counter(spr-thread, decimal-leading-zero);
  counter-increment: spr-thread;
  font-family: Georgia, serif;
}

.spr-detail-block {
  border-left: 3px solid var(--spr-accent);
  padding: 5px 0 5px 16px;
}

.spr-detail-label {
  color: var(--spr-accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.spr-detail-block p {
  margin: 6px 0 0;
}

.spr-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.spr-chip {
  background: var(--spr-surface);
  border: 1px solid var(--spr-line);
  border-radius: 999px;
  color: var(--spr-muted);
  font-size: 12px;
  padding: 7px 11px;
}

.spr-concept-intro {
  align-items: start;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.55fr);
  margin-bottom: 28px;
}

.spr-asset-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}

.spr-image-card,
.spr-pdf-card {
  background: var(--spr-surface);
  border: 1px solid var(--spr-line);
  border-radius: 20px;
  margin: 0;
  min-width: 0;
  overflow: hidden;
}

.spr-image {
  background: #e8e4dc;
  cursor: zoom-in;
  display: block;
  height: clamp(280px, 40vw, 560px);
  object-fit: contain;
  width: 100%;
}

.spr-media-caption {
  display: grid;
  gap: 5px;
  padding: 14px 17px;
}

.spr-media-caption span {
  color: var(--spr-muted);
  font-size: 12px;
}

.spr-pdf-card {
  display: grid;
  grid-template-rows: minmax(360px, 58vh) auto;
}

.spr-pdf-object {
  background: #e5e2dc;
  border: 0;
  height: 100%;
  width: 100%;
}

.spr-pdf-copy {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  padding: 16px 18px;
}

.spr-pdf-copy p {
  color: var(--spr-muted);
  flex: 1 1 300px;
  margin: 0;
}

.spr-link {
  background: var(--spr-forest);
  border-radius: 999px;
  color: #fff;
  display: inline-flex;
  padding: 9px 14px;
  text-decoration: none;
}

.spr-design-intro {
  background: #efede7;
  border-left: 3px solid #7d8b78;
  border-radius: 13px;
  margin-bottom: 24px;
  padding: 14px 17px;
}

.spr-design-summary {
  color: #55514b;
  font-size: 15px;
  line-height: 1.75;
  margin: 0;
}

.spr-focus-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(var(--spr-unit-count, 3), minmax(0, 1fr));
  grid-template-rows: minmax(480px, 56vh);
  transition:
    grid-template-columns 620ms cubic-bezier(0.2, 0.75, 0.2, 1),
    grid-template-rows 620ms cubic-bezier(0.2, 0.75, 0.2, 1);
}

.spr-focus-card {
  background: #f8f6f1;
  border: 1px solid var(--spr-line);
  border-radius: 22px;
  color: var(--spr-ink);
  cursor: pointer;
  display: grid;
  grid-template-rows: minmax(250px, 55%) minmax(0, 45%);
  min-width: 0;
  overflow: hidden;
  position: relative;
  text-align: left;
  transition:
    opacity 400ms ease,
    filter 400ms ease,
    transform 450ms cubic-bezier(0.2, 0.75, 0.2, 1);
}

.spr-focus-card:hover {
  transform: translateY(-4px);
}

.spr-focus-media {
  background: #c9c1b5;
  min-height: 0;
  overflow: hidden;
  position: relative;
}

.spr-design-image {
  display: block;
  height: 100%;
  object-fit: cover;
  transition: transform 700ms cubic-bezier(0.2, 0.75, 0.2, 1);
  width: 100%;
}

.spr-focus-media.is-missing,
.spr-progress-image-wrap.is-missing {
  align-items: center;
  display: flex;
  justify-content: center;
}

.spr-focus-media-label {
  background: rgba(251, 250, 247, 0.92);
  border-radius: 999px;
  bottom: 13px;
  font-size: 12px;
  left: 14px;
  letter-spacing: 0.08em;
  padding: 7px 10px;
  position: absolute;
  z-index: 3;
}

.spr-focus-body {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 14px 18px;
}

/* 材质块铺开后下半截才有东西可放，给它比原来 45% 多一点空间 */
.spr-focus-grid:not(.is-focused) .spr-focus-card {
  grid-template-rows: minmax(210px, 47%) minmax(0, 53%);
}

/* 只有视觉方向这一类的卡片下半截要装「色带 + 材质块」，再多让一点高度给它。
   🔴 必须按 data-focus-engine 限定：方案对比 / 条件路径的卡片下半截只有文字，
   一起放宽只会让它们空更多。 */
.spr-focus-grid[data-focus-engine="visual_directions"]:not(.is-focused)
  .spr-focus-card {
  grid-template-rows: minmax(190px, 42%) minmax(0, 58%);
}

.spr-visual-signature {
  display: flex;
  flex-direction: column;
  /* 撑满标题与「进入方向」之间的整段空白：材质块竖向拉长，卡片下半截
     才不会像原来那样空一大块。 */
  flex: 1 1 auto;
  min-height: 0;
}

/* 🔴 h3 / 摘要不许被拉伸的 signature 挤走。flex 容器里默认 shrink:1，
   一旦材质块变高，标题会先被压。 */
.spr-focus-body > h3,
.spr-focus-body > .spr-focus-summary {
  flex: 0 0 auto;
}

/* 折叠卡里只留材质名；品牌和用途放到展开态的材质组合里说 */
.spr-material-tiles:not(.is-wide) .spr-material-note {
  display: none;
}

.spr-focus-body .spr-focus-action {
  margin-top: auto;
}

.spr-focus-body h3 {
  font-family: Georgia, "Songti SC", serif;
  font-size: 25px;
  font-weight: 500;
  line-height: 1.22;
  margin: 0 0 4px;
}

.spr-focus-summary {
  color: var(--spr-muted);
  font-size: 14px;
  line-height: 1.5;
  margin: 0;
}

.spr-focus-meta {
  display: grid;
  gap: 6px 8px;
  grid-template-columns: auto 1fr;
  margin: 8px 0 0;
}

.spr-focus-meta dt,
.spr-focus-meta dd {
  background: #ece9e2;
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.5;
  margin: 0;
  padding: 6px 8px;
}

.spr-focus-meta dt {
  color: #8b5e46;
  font-weight: 700;
}

.spr-focus-action,
.spr-focus-restore,
.spr-hotspot-reset {
  background: var(--spr-forest);
  border: 0;
  border-radius: 999px;
  color: #fff;
  cursor: pointer;
  font-size: 13px;
  min-height: 44px;
  padding: 10px 14px;
}

.spr-focus-action {
  margin-top: 8px;
}

.spr-focus-mini-caption,
.spr-focus-restore {
  display: none;
}

.spr-focus-grid.is-focused {
  grid-template-columns: minmax(0, 3fr) minmax(210px, 1fr);
  grid-template-rows: repeat(
    var(--spr-candidate-count, 2), minmax(0, 1fr));
  height: min(72vh, 650px);
}

.spr-focus-grid.is-focused .spr-focus-card {
  grid-template-rows: 1fr;
}

.spr-focus-grid.is-focused .spr-focus-card.is-active {
  grid-column: 1;
  grid-row: 1 / -1;
}

.spr-focus-grid.is-focused .spr-focus-card.is-candidate {
  grid-column: 2;
}

.spr-focus-grid.is-focused .spr-focus-body,
.spr-focus-grid.is-focused .spr-focus-media-label {
  display: none;
}

.spr-focus-grid.is-focused .spr-focus-mini-caption {
  background: rgba(251, 250, 247, 0.92);
  border-radius: 10px;
  bottom: 13px;
  display: block;
  font-size: 13px;
  left: 14px;
  max-width: calc(100% - 28px);
  overflow: hidden;
  padding: 8px 10px;
  position: absolute;
  text-overflow: ellipsis;
  white-space: nowrap;
  z-index: 5;
}

.spr-focus-grid.is-focused .spr-focus-card.is-active .spr-focus-mini-caption {
  font-family: Georgia, "Songti SC", serif;
  font-size: 22px;
  padding: 11px 14px;
}

.spr-focus-grid.is-focused .spr-focus-card.is-active .spr-design-image {
  transform: scale(1.03);
}

.spr-focus-grid.is-focused .spr-focus-card.is-active .spr-focus-restore {
  background: rgba(251, 250, 247, 0.94);
  color: var(--spr-ink);
  display: block;
  position: absolute;
  right: 16px;
  top: 16px;
  z-index: 7;
}

.spr-focus-grid.is-branch {
  grid-template-columns: repeat(var(--spr-unit-count, 2), minmax(0, 1fr));
  grid-template-rows: minmax(520px, 62vh);
}

.spr-focus-grid.is-branch.is-focused {
  grid-template-columns: minmax(0, 3fr) minmax(210px, 1fr);
  grid-template-rows: minmax(610px, 68vh);
  height: auto;
}

.spr-focus-grid.is-branch.is-focused .spr-focus-card.is-active {
  grid-row: 1;
}

.spr-focus-grid.is-branch.is-focused .spr-focus-card.is-candidate {
  grid-row: 1;
  opacity: 0.4;
  filter: grayscale(0.7);
}

.spr-card-palette {
  background: #ddd6ca;
  border-radius: 999px;
  display: flex;
  /* 🔴 flex: 0 0 auto 不能省。signature 改成 flex 纵向排布后，色带作为
     flex item 会被下面的材质块挤压到高度 0——不报错，就是整条色卡消失。 */
  flex: 0 0 auto;
  height: 12px;
  margin-top: 13px;
  overflow: hidden;
}

.spr-card-palette i {
  display: block;
  min-width: 10px;
}

.spr-card-palette.has-ratios i {
  flex: 1 1 0;
}

.spr-card-palette.is-discrete {
  background: transparent;
  gap: 6px;
  justify-content: flex-start;
}

.spr-card-palette.is-discrete i {
  border: 1px solid rgba(36, 57, 49, 0.12);
  border-radius: 999px;
  flex: 0 0 34px;
}

/* 材质组合：原来是「小圆图 + 文字」的胶囊，最多 4 个，卡片下半截空一大块。
   改成平铺的材质块——材质本身就是要被看清纹理的东西，缩成 20px 圆点
   等于没展示；几个方向并排时，这排块也正好用来横向比材质差异。 */
.spr-material-tiles {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(74px, 1fr));
  margin-top: 12px;
}

/* 折叠卡里：一行最多 6 块（列数由 JS 按条数算好写进 --spr-tile-cols，
   少了自动拉宽、间距跟着变），竖向铺满标题到按钮之间的空白。
   原来是 4:3 的矮块，下半截空一大截；现在贴图竖向拉长，
   几个方向并排时这排块正好用来横比材质差异。 */
.spr-material-tiles:not(.is-wide) {
  display: grid;
  flex: 1 1 auto;
  gap: 8px 6px;
  grid-template-columns: repeat(var(--spr-tile-cols, 6), minmax(0, 1fr));
  grid-template-rows: repeat(var(--spr-tile-rows, 1), minmax(0, 1fr));
  min-height: 88px;
}

.spr-material-tiles:not(.is-wide) .spr-material-face {
  /* 高度改由这一行剩余空间决定，比例限制必须解除，否则块会被
     aspect-ratio 钉回矮的 4:3，下面又空出来。 */
  aspect-ratio: auto;
  flex: 1 1 auto;
  min-height: 38px;
}

/* 只有一两条材质时不许把块拉成横躺的大方块——限宽 + 居中，
   条数少就是间距自然变大（列还是均分的，视觉上就是「自动调距离」）。 */
.spr-material-tiles:not(.is-wide) .spr-material-tile {
  margin: 0 auto;
  max-width: 118px;
  width: 100%;
}

.spr-material-tile {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 0;
  min-width: 0;
}

.spr-material-face {
  aspect-ratio: 4 / 3;
  background: #ece9e2;
  border: 1px solid rgba(36, 57, 49, 0.1);
  border-radius: 10px;
  overflow: hidden;
}

.spr-material-face.is-empty {
  background:
    repeating-linear-gradient(
      45deg, #e6e2d9 0 6px, #ded9ce 6px 12px);
}

.spr-material-image {
  display: block;
  height: 100%;
  object-fit: cover;
  width: 100%;
}

/* 名字一行截断而不是换行：同一排里所有贴图的下沿才对得齐。
   全名走 tile 的 title 属性，鼠标悬停能看全。 */
.spr-material-name {
  color: #3d4f47;
  font-size: 12px;
  letter-spacing: 0.02em;
  line-height: 1.3;
  overflow: hidden;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.spr-material-tiles:not(.is-wide) .spr-material-name {
  flex: 0 0 auto;
}

.spr-material-note {
  color: var(--spr-muted);
  font-size: 11px;
  line-height: 1.2;
  overflow: hidden;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 展开态底部横幅：左色彩结构、右材质组合 */
.spr-direction-host {
  display: none;
}

.spr-direction-host.is-visible {
  display: block;
  margin-top: 16px;
}

.spr-direction-summary {
  background: #f1eee7;
  border: 1px solid var(--spr-line);
  border-radius: 20px;
  padding: 18px 22px 20px;
}

.spr-direction-head {
  align-items: baseline;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.spr-direction-eyebrow {
  color: var(--spr-muted);
  font-size: 11px;
  letter-spacing: 0.12em;
  width: 100%;
}

.spr-direction-head h4 {
  font-family: Georgia, "Songti SC", serif;
  font-size: 23px;
  font-weight: 500;
  margin: 0;
}

.spr-direction-note {
  color: var(--spr-muted);
  font-size: 11px;
  margin-left: auto;
}

.spr-direction-body {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  margin-top: 14px;
}

.spr-direction-label {
  color: var(--spr-muted);
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  margin-bottom: 7px;
}

.spr-direction-block .spr-material-tiles {
  margin-top: 0;
}

/* 展开态也用 JS 算好的均衡列数：7 条排成 6+1 会在右下角留个孤块、
   左边色彩结构那半边跟着空一大截；排成 4+3 版面才是平的。 */
.spr-material-tiles.is-wide {
  grid-template-columns: repeat(var(--spr-tile-cols, 4), minmax(0, 1fr));
}

.spr-material-tiles.is-wide .spr-material-face {
  aspect-ratio: 3 / 2;
}

/* 色彩结构：色带按占比分段，段内压名称 + 百分比。
   色带跟右边材质墙一样高——右边排两行时，左边如果还是 58px 的一条，
   横幅左半边就整块空着（这正是「下面空白太多」那条意见）。 */
.spr-direction-block {
  display: flex;
  flex-direction: column;
}

.spr-direction-block > .spr-material-tiles,
.spr-direction-block > .spr-palette-structure {
  flex: 1 1 auto;
}

.spr-palette-structure {
  border-radius: 12px;
  display: flex;
  min-height: 58px;
  overflow: hidden;
}

.spr-palette-structure > div {
  align-items: flex-end;
  display: flex;
  min-width: 26px;
  padding: 7px 8px;
}

.spr-palette-structure.has-ratios > div {
  flex: 1 1 0;
}

.spr-palette-structure.is-discrete > div {
  flex: 1 1 0;
}

.spr-palette-caption {
  font-size: 11px;
  line-height: 1.2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

@media (max-width: 900px) {
  .spr-direction-body {
    grid-template-columns: minmax(0, 1fr);
  }
}

.spr-hotspot-detail,
.spr-evidence-panel {
  background: var(--spr-surface);
  border: 1px solid var(--spr-line);
  border-radius: 24px;
  min-width: 0;
  padding: clamp(22px, 3vw, 38px);
}

.spr-hotspot-detail h3,
.spr-evidence-panel h3 {
  font-family: Georgia, "Songti SC", serif;
  font-size: clamp(28px, 3vw, 44px);
  font-weight: 500;
  line-height: 1.2;
  margin: 0 0 18px;
}

.spr-unit-summary {
  color: var(--spr-muted);
  font-size: 16px;
}

.spr-detail-list {
  display: grid;
  gap: 8px 18px;
  grid-template-columns: minmax(90px, auto) 1fr;
  margin: 22px 0;
}

.spr-detail-list dt {
  color: var(--spr-accent);
  font-size: 12px;
  font-weight: 700;
}

.spr-detail-list dd {
  margin: 0;
}

.spr-progress-layout {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
}

.spr-progress-visual {
  background: #d8d1c6;
  border-radius: 24px;
  min-height: 590px;
  overflow: hidden;
  position: relative;
}

.spr-progress-media,
.spr-progress-image-wrap {
  height: 100%;
  inset: 0;
  position: absolute;
  width: 100%;
}

.spr-progress-image-wrap {
  animation: spr-progress-fade 420ms ease both;
  transition: opacity 320ms ease;
}

.spr-progress-image-wrap.is-pending {
  opacity: 0;
}

@keyframes spr-progress-fade {
  from { opacity: 0.35; transform: scale(1.015); }
  to { opacity: 1; transform: scale(1); }
}

.spr-progress-label {
  background: rgba(251, 250, 247, 0.92);
  border-radius: 12px;
  bottom: 17px;
  font-size: 12px;
  left: 18px;
  letter-spacing: 0.06em;
  padding: 10px 13px;
  position: absolute;
  z-index: 4;
}

.spr-progress-copy {
  background: #efede7;
  border-radius: 24px;
  display: flex;
  flex-direction: column;
  padding: 29px;
}

.spr-progress-number,
.spr-hotspot-number {
  color: #c0b4a2;
  font-family: Georgia, "Songti SC", serif;
  font-size: 70px;
  line-height: 1;
}

.spr-progress-copy h3 {
  font-family: Georgia, "Songti SC", serif;
  font-size: 31px;
  font-weight: 500;
  line-height: 1.25;
  margin: 12px 0 10px;
}

.spr-progress-summary,
.spr-hotspot-description {
  color: var(--spr-muted);
  font-size: 15px;
  line-height: 1.72;
  margin: 0;
}

.spr-stage-control {
  margin-top: 18px;
}

.spr-progress-node {
  background: #f7f5f0;
  border: 1px solid transparent;
  border-radius: 10px;
  color: #67635c;
  cursor: pointer;
  font-size: 13px;
  min-height: 42px;
  padding: 8px 6px;
}

.spr-progress-node.is-passed {
  background: #e4e6df;
  color: #4f594a;
}

.spr-progress-node.is-selected {
  background: var(--spr-forest);
  border-color: var(--spr-forest);
  color: #fff;
  font-weight: 700;
}

.spr-progress-slider {
  appearance: none;
  background: linear-gradient(
    90deg,
    #7d8b78 0 var(--spr-progress-percent, 0%),
    #d3cfc7 var(--spr-progress-percent, 0%) 100%);
  border-radius: 9px;
  cursor: pointer;
  height: 6px;
  margin: 8px 0 0;
  width: 100%;
}

.spr-progress-slider::-webkit-slider-thumb {
  appearance: none;
  background: var(--spr-paper);
  border: 7px solid #7d8b78;
  border-radius: 50%;
  height: 24px;
  width: 24px;
}

.spr-progress-nodes {
  display: grid;
  gap: 6px;
  grid-template-columns: repeat(var(--spr-stage-count, 3), minmax(110px, 1fr));
  margin-top: 8px;
  overflow-x: auto;
}

.spr-progress-facts {
  display: grid;
  gap: 9px;
  grid-template-columns: 1fr 1fr;
  margin-top: 15px;
}

.spr-progress-info h4 {
  font-size: 12px;
  letter-spacing: 0.08em;
  margin: 0 0 7px;
}

.spr-progress-list {
  display: grid;
  gap: 7px;
}

.spr-progress-list span {
  background: var(--spr-paper);
  border-radius: 11px;
  font-size: 14px;
  line-height: 1.55;
  padding: 10px 12px;
}

.spr-progress-info.is-retained .spr-progress-list span {
  background: #e3e7df;
}

.spr-progress-list .spr-structured-missing {
  border: 1px dashed rgba(166, 111, 79, 0.45);
  color: var(--spr-muted);
}

.spr-progress-detail {
  display: grid;
  gap: 7px 10px;
  grid-template-columns: auto 1fr;
  margin: 16px 0 0;
}

.spr-progress-detail dt {
  color: var(--spr-accent);
  font-size: 12px;
  font-weight: 700;
}

.spr-progress-detail dd {
  font-size: 14px;
  margin: 0;
}

.spr-hotspot-layout {
  align-items: start;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
}

.spr-hotspot-stage {
  background: #1c211e;
  border-radius: 24px;
  min-height: 520px;
  overflow: hidden;
  position: relative;
}

.spr-hotspot-canvas {
  height: 100%;
  inset: 0;
  position: absolute;
  transform: none;
  transition: transform 750ms cubic-bezier(0.2, 0.75, 0.2, 1);
  width: 100%;
}

.spr-hotspot-canvas.is-focused {
  transform:
    translate(
      var(--spr-hotspot-tx, 0),
      var(--spr-hotspot-ty, 0))
    scale(1.72);
}

.spr-hotspot-image {
  height: 100%;
  inset: 0;
  object-fit: contain;
  position: absolute;
  width: 100%;
}

.spr-hotspot {
  align-items: center;
  background: #fff;
  border: 3px solid var(--spr-accent);
  border-radius: 50%;
  box-shadow: 0 7px 24px rgba(0, 0, 0, 0.25);
  color: var(--spr-ink);
  cursor: pointer;
  display: flex;
  font-weight: 800;
  height: 38px;
  justify-content: center;
  padding: 0;
  position: absolute;
  transform: translate(-50%, -50%);
  width: 38px;
}

.spr-hotspot.is-dimmed {
  opacity: 0.27;
}

.spr-hotspot.is-selected {
  background: var(--spr-accent);
  border-color: #fff;
  color: #fff;
  height: 46px;
  width: 46px;
}

.spr-hotspot-detail {
  display: flex;
  flex-direction: column;
  min-height: 520px;
}

.spr-hotspot-list {
  list-style: none;
  margin: 16px 0;
  padding: 0;
}

.spr-hotspot-list li {
  border-bottom: 1px solid var(--spr-line);
  font-size: 14px;
  line-height: 1.6;
  padding: 10px 0;
}

.spr-hotspot-reset {
  margin-top: auto;
}

.spr-evidence-mobile-tabs {
  display: none;
}

.spr-evidence-wall {
  display: grid;
  gap: clamp(12px, 1.4vw, 22px);
  grid-template-columns: repeat(
    var(--spr-evidence-column-count),
    minmax(0, 1fr));
  min-height: clamp(500px, 62vh, 680px);
}

.spr-evidence-column-card {
  background: var(--spr-surface);
  border: 1px solid var(--spr-line);
  border-radius: 24px;
  cursor: pointer;
  min-width: 0;
  overflow: hidden;
  position: relative;
  transition:
    flex-basis 260ms ease,
    flex-grow 260ms ease,
    opacity 180ms ease,
    transform 180ms ease;
}

.spr-evidence-column-card:focus-visible {
  outline: 3px solid rgba(174, 111, 72, .42);
  outline-offset: 4px;
}

.spr-evidence-column-summary {
  display: grid;
  grid-template-rows: minmax(280px, 1fr) auto;
  height: 100%;
  min-height: 0;
}

.spr-evidence-overview-media {
  background: #e5e1d9;
  min-height: 0;
  overflow: hidden;
  position: relative;
}

.spr-evidence-overview-image {
  display: block;
  height: 100%;
  inset: 0;
  min-height: 280px;
  object-fit: cover;
  position: absolute;
  transition: transform 220ms ease;
  width: 100%;
}

.spr-evidence-column-card:hover .spr-evidence-overview-image,
.spr-evidence-column-card:focus-visible .spr-evidence-overview-image {
  transform: scale(1.025);
}

.spr-evidence-pdf-summary {
  align-content: center;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, .74), rgba(229, 224, 214, .76)),
    repeating-linear-gradient(
      0deg,
      transparent 0 19px,
      rgba(81, 87, 78, .08) 19px 20px);
  color: var(--spr-muted);
  display: grid;
  gap: 10px;
  height: 100%;
  justify-items: start;
  min-height: 280px;
  padding: clamp(24px, 3vw, 42px);
}

.spr-evidence-pdf-summary strong {
  color: var(--spr-ink);
  font-family: "SimSun", "Songti SC", serif;
  font-size: clamp(20px, 2vw, 28px);
  font-weight: 500;
}

.spr-evidence-pdf-summary > span:last-child {
  font-size: 13px;
}

.spr-evidence-pdf-mark {
  align-items: center;
  background: var(--spr-forest);
  border-radius: 50%;
  color: #fff;
  display: inline-flex;
  font-family: Georgia, serif;
  font-size: 13px;
  height: 54px;
  justify-content: center;
  letter-spacing: .08em;
  width: 54px;
}

.spr-evidence-column-copy {
  display: grid;
  gap: 9px;
  padding: clamp(20px, 2.4vw, 32px);
}

.spr-evidence-column-number,
.spr-evidence-position {
  color: var(--spr-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
}

.spr-evidence-column-copy h3 {
  font-family: "SimSun", "Songti SC", serif;
  font-size: clamp(28px, 2.7vw, 42px);
  font-weight: 500;
  line-height: 1.1;
  margin: 0;
}

.spr-evidence-representative-title {
  font-size: 15px;
  line-height: 1.5;
}

.spr-evidence-column-description {
  color: var(--spr-muted);
  display: -webkit-box;
  font-size: 14px;
  line-height: 1.65;
  margin: 0;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.spr-evidence-count {
  color: var(--spr-forest);
  font-size: 13px;
  font-weight: 700;
  margin-top: 4px;
}

.spr-evidence-expanded {
  display: none;
}

.spr-evidence-wall.is-focused {
  display: flex;
}

.spr-evidence-wall.is-focused .spr-evidence-column-card {
  flex: 0 1 clamp(118px, 12vw, 180px);
}

.spr-evidence-wall.is-focused .spr-evidence-column-card.is-active {
  cursor: default;
  flex: 1 1 72%;
}

.spr-evidence-wall.is-focused .spr-evidence-column-card.is-active
  .spr-evidence-column-summary {
  display: none;
}

.spr-evidence-wall.is-focused .spr-evidence-column-card.is-active
  .spr-evidence-expanded {
  display: grid;
  gap: 18px;
  height: 100%;
  padding: clamp(20px, 2.5vw, 34px);
}

.spr-evidence-wall.is-focused .spr-evidence-column-card.is-candidate {
  opacity: .58;
}

.spr-evidence-wall.is-focused .spr-evidence-column-card.is-candidate:hover,
.spr-evidence-wall.is-focused .spr-evidence-column-card.is-candidate:focus-visible {
  opacity: .9;
}

.spr-evidence-wall.is-focused .spr-evidence-column-card.is-candidate
  .spr-evidence-column-summary {
  grid-template-rows: minmax(340px, 1fr) auto;
}

.spr-evidence-wall.is-focused .spr-evidence-column-card.is-candidate
  .spr-evidence-column-copy {
  gap: 6px;
  padding: 16px 13px;
}

.spr-evidence-wall.is-focused .spr-evidence-column-card.is-candidate
  .spr-evidence-column-number,
.spr-evidence-wall.is-focused .spr-evidence-column-card.is-candidate
  .spr-evidence-representative-title,
.spr-evidence-wall.is-focused .spr-evidence-column-card.is-candidate
  .spr-evidence-column-description,
.spr-evidence-wall.is-focused .spr-evidence-column-card.is-candidate
  .spr-evidence-count {
  display: none;
}

.spr-evidence-wall.is-focused .spr-evidence-column-card.is-candidate
  .spr-evidence-column-copy h3 {
  font-size: clamp(20px, 1.8vw, 28px);
  text-align: center;
}

.spr-evidence-expanded-head {
  align-items: start;
  display: flex;
  gap: 20px;
  justify-content: space-between;
}

.spr-evidence-expanded-head h3 {
  font-family: "SimSun", "Songti SC", serif;
  font-size: clamp(28px, 3vw, 44px);
  font-weight: 500;
  line-height: 1.16;
  margin: 7px 0 0;
}

.spr-evidence-viewer {
  min-height: 0;
}

.spr-evidence-viewer .spr-image {
  height: clamp(330px, 46vh, 520px);
}

.spr-evidence-viewer .spr-pdf-card {
  grid-template-rows: minmax(360px, 48vh) auto;
}

.spr-evidence-footer {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  justify-content: space-between;
}

.spr-evidence-pager {
  align-items: center;
  display: flex;
  gap: 12px;
  justify-content: center;
}

.spr-evidence-pager button:disabled {
  cursor: not-allowed;
  opacity: .38;
}

.spr-evidence-page-count {
  color: var(--spr-muted);
  font-variant-numeric: tabular-nums;
  min-width: 58px;
  text-align: center;
}

.spr-evidence-open {
  white-space: nowrap;
}

.spr-video-wrap {
  background: #121714;
  border-radius: 22px;
  min-width: 0;
  overflow: hidden;
}

.spr-video {
  display: block;
  max-height: 72vh;
  width: 100%;
}

.spr-next-list {
  counter-reset: spr-next;
  display: grid;
  gap: 13px;
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.spr-next-item {
  background: var(--spr-surface);
  border: 1px solid var(--spr-line);
  border-radius: 18px;
  display: grid;
  gap: 5px;
  grid-template-columns: auto 1fr;
  padding: 18px 20px;
}

.spr-next-item::before {
  color: var(--spr-accent);
  content: counter(spr-next, decimal-leading-zero);
  counter-increment: spr-next;
  font-family: Georgia, serif;
  grid-row: 1 / span 2;
  margin-right: 12px;
}

.spr-next-item p {
  color: var(--spr-muted);
  margin: 0;
}

.spr-media-fallback {
  align-items: center;
  background:
    linear-gradient(135deg, rgba(166, 111, 79, 0.12), transparent),
    #e9e6df;
  border: 1px dashed rgba(36, 39, 33, 0.25);
  border-radius: 18px;
  color: var(--spr-muted);
  display: flex;
  flex-direction: column;
  gap: 6px;
  justify-content: center;
  min-height: 180px;
  padding: 28px;
  text-align: center;
}

.spr-media-fallback[hidden] {
  display: none;
}

.spr-media-fallback strong {
  color: var(--spr-ink);
}

.spr-lightbox {
  align-items: center;
  background: rgba(10, 13, 11, 0.92);
  display: flex;
  inset: 0;
  justify-content: center;
  padding: 28px;
  position: fixed;
  z-index: 9999;
}

.spr-lightbox-image {
  max-height: calc(100vh - 56px);
  max-width: calc(100vw - 56px);
  object-fit: contain;
}

.spr-lightbox-close {
  background: #fff;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  padding: 10px 15px;
  position: absolute;
  right: 24px;
  top: 20px;
}

.spr-presentation-nav {
  align-items: center;
  background: rgba(38, 58, 50, 0.95);
  border-radius: 999px;
  bottom: 18px;
  color: #fff;
  display: flex;
  gap: 12px;
  left: 50%;
  padding: 8px;
  position: fixed;
  transform: translateX(-50%);
  z-index: 30;
}

.spr-presentation-nav .spr-nav-button {
  border-color: rgba(255, 255, 255, 0.28);
  color: #fff;
}

.spr-page-indicator {
  min-width: 56px;
  text-align: center;
}

.spr-root[data-mode="presentation"] .spr-deck {
  display: block;
}

.spr-root[data-mode="presentation"] .spr-chapter {
  height: calc(100vh - 112px);
  min-height: 620px;
}

.spr-root[data-mode="embedded"] {
  contain: layout style;
  min-height: 0;
}

.spr-root[data-mode="embedded"] .spr-deck {
  gap: 14px;
}

.spr-root[data-mode="embedded"] .spr-chapter {
  border-radius: 18px;
  box-shadow: none;
  min-height: 0;
  padding: clamp(20px, 4vw, 38px);
  scroll-margin-top: 0;
}

.spr-root[data-mode="embedded"] .spr-title {
  font-size: clamp(28px, 5vw, 48px);
}

.spr-root[data-mode="embedded"] .spr-chapter-header {
  margin-bottom: 22px;
}

.spr-root.is-compact .spr-narrative-grid,
.spr-root.is-compact .spr-concept-intro,
.spr-root.is-compact .spr-progress-layout,
.spr-root.is-compact .spr-hotspot-layout,
.spr-root.is-compact .spr-evidence-layout {
  grid-template-columns: 1fr;
}

.spr-root.is-compact .spr-narrative-item,
.spr-root.is-compact .spr-narrative-item:nth-child(even),
.spr-root.is-compact .spr-overall-layout {
  grid-template-columns: 1fr;
}

.spr-root.is-compact .spr-narrative-item:nth-child(even) .spr-narrative-copy {
  order: initial;
}

.spr-root.is-compact .spr-narrative-item .spr-media,
.spr-root.is-compact .spr-overall-layout > .spr-media {
  min-height: 260px;
}

.spr-root.is-compact .spr-next-groups {
  grid-template-columns: 1fr;
}

.spr-root.is-compact .spr-evidence-mobile-tabs {
  display: flex;
  gap: 8px;
  margin: 0 -4px 14px;
  overflow-x: auto;
  padding: 4px;
  scrollbar-width: thin;
}

.spr-root.is-compact .spr-evidence-mobile-tab {
  background: transparent;
  border: 1px solid var(--spr-line);
  border-radius: 999px;
  color: var(--spr-muted);
  cursor: pointer;
  flex: 0 0 auto;
  font-size: 14px;
  min-height: 44px;
  padding: 9px 18px;
}

.spr-root.is-compact .spr-evidence-mobile-tab.is-selected {
  background: var(--spr-forest);
  border-color: var(--spr-forest);
  color: #fff;
}

.spr-root.is-compact .spr-evidence-wall,
.spr-root.is-compact .spr-evidence-wall.is-focused {
  display: block;
  min-height: 0;
}

.spr-root.is-compact .spr-evidence-column-card {
  display: none;
}

.spr-root.is-compact .spr-evidence-column-card.is-mobile-selected {
  cursor: default;
  display: block;
  min-height: 0;
  opacity: 1;
}

.spr-root.is-compact .spr-evidence-column-card.is-mobile-selected
  .spr-evidence-column-summary {
  display: none;
}

.spr-root.is-compact .spr-evidence-column-card.is-mobile-selected
  .spr-evidence-expanded {
  display: grid;
  gap: 16px;
  padding: 18px;
}

.spr-root.is-compact .spr-evidence-expanded-head {
  display: block;
}

.spr-root.is-compact .spr-evidence-restore {
  display: none;
}

.spr-root.is-compact .spr-evidence-expanded-head h3 {
  font-size: clamp(26px, 8vw, 36px);
}

.spr-root.is-compact .spr-evidence-viewer .spr-image {
  height: min(66vw, 420px);
  min-height: 260px;
}

.spr-root.is-compact .spr-evidence-viewer .spr-pdf-card {
  grid-template-rows: minmax(320px, 52vh) auto;
}

.spr-root.is-compact .spr-evidence-footer {
  align-items: stretch;
  flex-direction: column;
}

.spr-root.is-compact .spr-evidence-pager {
  justify-content: space-between;
  width: 100%;
}

.spr-root.is-compact .spr-evidence-open {
  align-self: flex-start;
  min-height: 44px;
  padding: 10px 0;
}

.spr-root.is-compact .spr-mobile-directory {
  display: flex;
}

.spr-root.is-compact .spr-toolbar-title,
.spr-root.is-compact .spr-directory {
  display: none;
}

.spr-root.is-compact .spr-toolbar.is-directory-open .spr-directory {
  display: grid;
  gap: 7px;
  overflow: visible;
}

.spr-root.is-compact .spr-toolbar.is-directory-open .spr-directory-item {
  text-align: left;
  width: 100%;
}

.spr-root.is-compact .spr-focus-grid:not(.is-focused) {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 4px;
  scroll-snap-type: x mandatory;
}

.spr-root.is-compact .spr-focus-grid:not(.is-focused) .spr-focus-card {
  flex: 0 0 min(86vw, 520px);
  min-height: 470px;
  scroll-snap-align: start;
}

.spr-root.is-compact .spr-focus-grid.is-focused,
.spr-root.is-compact .spr-focus-grid.is-branch.is-focused {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  height: auto;
}

.spr-root.is-compact .spr-focus-grid.is-focused .spr-focus-card.is-active {
  flex: 0 0 100%;
  min-height: 520px;
}

.spr-root.is-compact .spr-focus-grid.is-focused .spr-focus-card.is-candidate {
  flex: 1 1 calc(50% - 5px);
  min-height: 165px;
  opacity: 0.62;
}

.spr-root.is-compact .spr-focus-card {
  transform: none;
}

.spr-root.is-compact .spr-progress-visual {
  min-height: 420px;
}

@media (max-width: 900px) {
  .spr-toolbar {
    align-items: stretch;
    border-radius: 0;
    flex-direction: column;
    margin-bottom: 10px;
    top: 0;
  }

  .spr-toolbar-title {
    display: none;
    max-width: 100%;
  }

  .spr-mobile-directory {
    display: flex;
  }

  .spr-directory {
    display: none;
  }

  .spr-toolbar.is-directory-open .spr-directory {
    display: grid;
    gap: 7px;
    overflow: visible;
  }

  .spr-toolbar.is-directory-open .spr-directory-item {
    text-align: left;
    width: 100%;
  }

  .spr-deck {
    gap: 14px;
  }

  .spr-chapter {
    border-radius: 18px;
    min-height: 0;
    padding: 30px 20px;
  }

  .spr-cover {
    min-height: calc(100svh - 98px);
    padding: 34px 22px;
  }

  .spr-cover .spr-title {
    font-size: clamp(46px, 14vw, 66px);
    max-width: 8em;
  }

  .spr-cover-copy {
    gap: 14px;
    max-width: 100%;
  }

  .spr-cover-lead {
    font-size: 15px;
    line-height: 1.65;
    max-width: 30em;
  }

  .spr-cover-meta {
    display: grid;
    gap: 9px 18px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
  }

  .spr-cover-meta-item {
    min-width: 0;
  }

  .spr-cover-meta dd {
    font-size: 14px;
  }

  .spr-cover-enter {
    margin-top: 4px;
    min-height: 48px;
    width: 100%;
  }

  .spr-narrative-grid,
  .spr-concept-intro,
  .spr-progress-layout,
  .spr-hotspot-layout,
  .spr-evidence-layout {
    grid-template-columns: 1fr;
  }

  .spr-narrative-item,
  .spr-narrative-item:nth-child(even),
  .spr-overall-layout {
    grid-template-columns: 1fr;
  }

  .spr-narrative-item:nth-child(even) .spr-narrative-copy {
    order: initial;
  }

  .spr-narrative-item .spr-media,
  .spr-overall-layout > .spr-media {
    min-height: 260px;
  }

  .spr-next-groups {
    grid-template-columns: 1fr;
  }

  .spr-focus-grid:not(.is-focused) {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding: 4px;
    scroll-snap-type: x mandatory;
  }

  .spr-focus-grid:not(.is-focused) .spr-focus-card {
    flex: 0 0 min(86vw, 520px);
    min-height: 470px;
    scroll-snap-align: start;
    transform: none !important;
  }

  .spr-focus-grid.is-focused,
  .spr-focus-grid.is-branch.is-focused {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    height: auto;
  }

  .spr-focus-grid.is-focused .spr-focus-card.is-active {
    flex: 0 0 100%;
    min-height: 520px;
  }

  .spr-focus-grid.is-focused .spr-focus-card.is-candidate {
    flex: 1 1 calc(50% - 5px);
    min-height: 165px;
    opacity: 0.62;
  }

  .spr-focus-grid.is-focused .spr-focus-card.is-candidate .spr-focus-media {
    height: 165px;
  }

  .spr-progress-nodes {
    margin-left: -4px;
    margin-right: -4px;
  }

  .spr-hotspot-stage {
    min-height: 360px;
  }

  .spr-hotspot-detail {
    position: relative;
  }

  .spr-pdf-card {
    grid-template-rows: minmax(360px, 58vh) auto;
  }

  .spr-presentation-nav {
    bottom: 10px;
  }
}

@media (max-width: 520px) {
  .spr-title {
    font-size: 34px;
  }

  .spr-subtitle {
    font-size: 14px;
  }

  .spr-image {
    height: min(72vh, 420px);
  }

  .spr-pdf-object {
    max-width: 100%;
  }

  .spr-video {
    max-width: 100%;
  }

  .spr-detail-list {
    grid-template-columns: 1fr;
  }

  .spr-focus-body h3 {
    font-size: 24px;
  }

  .spr-focus-summary,
  .spr-progress-summary,
  .spr-hotspot-description {
    font-size: 14px;
  }

  .spr-progress-facts,
  .spr-progress-detail {
    grid-template-columns: 1fr;
  }

  .spr-detail-list dd {
    border-bottom: 1px solid var(--spr-line);
    padding-bottom: 10px;
  }

  .spr-hotspot {
    height: 42px;
    width: 42px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .spr-root *,
  .spr-root *::before,
  .spr-root *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }

  .spr-hotspot-canvas.is-focused {
    transform: none;
  }
}

@media print {
  .spr-toolbar,
  .spr-presentation-nav {
    display: none !important;
  }

  .spr-root,
  .spr-deck {
    display: block !important;
    margin: 0;
    max-width: none;
  }

  .spr-chapter,
  .spr-root[data-mode="presentation"] .spr-chapter {
    border: 0;
    border-radius: 0;
    box-shadow: none;
    break-after: page;
    display: block !important;
    height: auto;
    min-height: 100vh;
    page-break-after: always;
  }
}