/* ============================================================
   水土营造 · 设计变量（Design Tokens）
   这是全站设计语言的唯一定义处。改这里 = 改整站视觉。
   ============================================================ */
:root {
  /* — 颜色 · 底色 — */
  --paper: #ffffff;        /* 页面主底色（纸白） */
  --paper-soft: #f7f7f7;   /* 次级底 / 图片区软背景 */
  --placeholder: #f2f0ec;  /* 图片占位块 */

  /* — 颜色 · 文字 — */
  --ink: #322d29;          /* 主文字 / 标题 */
  --ink-soft: #44393c;     /* 正文 / 次级文字 */
  --muted: #6c757d;        /* 弱化文字：元信息、caption、说明 */

  /* — 颜色 · 强调（土色系）— */
  --clay: #d9bd90;         /* 浅陶：轻强调 */
  --clay-deep: #aa7f40;    /* 深陶：链接高亮、hover、当前项 —— 全站唯一强调色 */

  /* — 描边 —
     分隔线统一为「墨色低透明度」，随层级用 10%–20% alpha：
     rgba(50, 45, 41, .10 / .12 / .16 / .18)。越结构性越深。 */
  --line: rgba(50, 45, 41, .16);       /* 默认分隔线 */
  --line-soft: rgba(50, 45, 41, .12);  /* 更轻的图片/卡片描边 */

  /* — 左栏导航 · 参考方案专用层级 — */
  --nav-ink: #222222;
  --nav-secondary: #555555;
  --nav-muted: #7f7a72;
  --nav-active: #9a733e;
  --nav-active-soft: rgba(154, 115, 62, .10);

  /* — 字体 —
     标题·品牌·引言用衬线；正文用无衬线；中文标题走宋体系。 */
  --font-serif: "Palatino Linotype", Palatino, "Book Antiqua", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --font-serif-cjk: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", SimSun, "Palatino Linotype", serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  /* — 版式 — */
  --max-shell: 1420px;     /* 三栏外壳最大宽度 */
}

* { box-sizing: border-box; }

html {
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.72;
  overflow-y: scroll;
}

a { color: inherit; text-decoration: none; transition: color .18s ease, opacity .18s ease; }

@media (prefers-reduced-motion: reduce) {
  .nav-section.opening > .nav-children,
  .nav-section.closing > .nav-children,
  .nav-section[open] > .nav-children { animation: none; }
}

.site-header {
  width: 100%;
  padding: 34px 34px 0;
}

.brand-strip {
  display: flex;
  align-items: flex-end;
  gap: clamp(18px, 3vw, 34px);
  max-width: var(--max-shell);
  margin: 0 auto;
  padding: 4px 0 22px;
  border-bottom: 1px solid rgba(50,45,41,.12);
}

.brand-mark {
  display: block;
  font-family: var(--font-serif-cjk);
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 400;
  letter-spacing: .14em;
  line-height: 1.1;
}

.brand-note {
  display: block;
  margin: 0 0 6px;
  color: var(--muted);
  font-family: var(--font-serif-cjk);
  font-size: 14px;
  letter-spacing: .05em;
  line-height: 1.4;
}

.layout-shell {
  display: grid;
  grid-template-columns: minmax(220px, 288px) minmax(0, 1fr) minmax(180px, 312px);
  gap: 34px;
  align-items: start;
  width: 100%;
  max-width: var(--max-shell);
  margin: 0 auto;
  padding: 18px 34px 70px;
}

.side-nav {
  position: sticky;
  top: 18px;
  align-self: start;
  display: block;
  max-width: 288px;
  min-height: calc(100vh - 150px);
  padding: 22px 28px 38px 22px;
  border-right: 1px solid var(--line-soft);
  color: var(--nav-secondary);
  font-family: var(--font-serif-cjk);
  overflow-y: auto;
  scrollbar-width: thin;
}

.nav-mark {
  display: inline-block;
  margin-bottom: 26px;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1;
}

.nav-section {
  margin-top: 28px;
}

.nav-section:first-of-type {
  margin-top: 0;
}

.nav-title {
  position: relative;
  display: block;
  margin: 0;
  padding: 2px 0;
  color: var(--nav-ink);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: .02em;
  cursor: pointer;
  list-style: none;
  transition: color .16s ease;
}

.nav-title::-webkit-details-marker {
  display: none;
}

.nav-section > .nav-title::before,
.nav-single::before {
  content: "";
  position: absolute;
  left: -16px;
  top: .72em;
  width: 5px;
  height: 1px;
  background: currentColor;
  opacity: .75;
}

.nav-title:hover,
.nav-title.current,
.nav-single.current {
  color: var(--nav-active);
}

.nav-single {
  margin-top: 28px;
  margin-bottom: 0;
}

.nav-children {
  display: block;
  margin-top: 9px;
  overflow: hidden;
}

.nav-section.opening > .nav-children {
  animation: nav-children-in .2s ease both;
}

.nav-section.closing > .nav-children {
  pointer-events: none;
  animation: nav-children-out .18s ease both;
}

@keyframes nav-children-in {
  from {
    opacity: 0;
    max-height: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    max-height: var(--nav-children-height, 720px);
    transform: translateY(0);
  }
}

@keyframes nav-children-out {
  from {
    opacity: 1;
    max-height: var(--nav-children-height, 720px);
    transform: translateY(0);
  }
  to {
    opacity: 0;
    max-height: 0;
    transform: translateY(-4px);
  }
}

.nav-child-group {
  display: grid;
  gap: 0;
}

.nav-child {
  display: block;
  width: 100%;
  max-width: 190px;
  margin-top: 7px;
  margin-left: 17px;
  color: var(--nav-secondary);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.65;
  letter-spacing: .01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-article-list {
  display: grid;
  gap: 0;
  margin-top: 4px;
  margin-bottom: 10px;
}

.nav-article {
  display: block;
  max-width: 178px;
  margin-top: 5px;
  margin-left: 34px;
  color: var(--nav-muted);
  font-size: 13px;
  font-weight: 400;
  line-height: 1.62;
  letter-spacing: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.side-nav a {
  text-decoration: none;
}

.nav-child:hover,
.nav-article:hover {
  color: var(--nav-ink);
}

.nav-child.current,
.nav-article.current,
.nav-child.current:hover,
.nav-article.current:hover {
  color: var(--nav-active);
  font-weight: 500;
}

.nav-child.current {
  position: relative;
}

.nav-child.current::before {
  content: "";
  position: absolute;
  left: -12px;
  top: .82em;
  width: 5px;
  height: 1px;
  background: var(--nav-active);
}

.nav-article.current {
  margin-left: 28px;
  padding: 2px 6px;
  border-radius: 2px;
  background: var(--nav-active-soft);
}

.content-column {
  width: 100%;
  min-width: 0;
  max-width: 920px;
}

.quote-column {
  padding-top: 18px;
  color: var(--ink-soft);
}

.quote {
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.35;
}

.aside-note,
small {
  color: var(--muted);
  font-size: 12px;
}

.hero-media,
.slider-placeholder,
.thumb,
.book-cover {
  display: block;
  overflow: hidden;
  background: var(--placeholder);
  border: 1px solid rgba(50,45,41,.10);
}

.hero-media img,
.slider-placeholder img,
.thumb img,
.book-cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-media.wide { aspect-ratio: 1200 / 595; }
.hero-media.portrait { aspect-ratio: 5 / 3; max-width: 760px; }
.slider-placeholder { aspect-ratio: 1200 / 595; margin: 12px 0 18px; }

.essay-block,
.news-block,
.index-intro,
.project-detail,
.contact-block {
  margin-top: 26px;
  max-width: 760px;
}

h1,
h2,
h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.18;
  margin: 0 0 14px;
}

h1 { font-size: clamp(28px, 3.4vw, 42px); letter-spacing: .01em; }
h2 { font-size: 22px; }
h3 {
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: 17px;
}

.lead {
  font-family: var(--font-serif);
  font-size: clamp(19px, 2vw, 26px);
  line-height: 1.4;
}

.essay-block p,
.news-block p,
.contact-block p,
.index-intro p {
  color: var(--ink-soft);
}

.home-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.home-actions a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 6px 14px;
  border: 1px solid rgba(50,45,41,.18);
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: 15px;
}

.home-actions a:hover {
  border-color: var(--clay-deep);
  color: var(--clay-deep);
}

.principle-grid,
.featured-projects {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.principle-grid section {
  padding-top: 16px;
  border-top: 1px solid rgba(50,45,41,.16);
}

.principle-grid p {
  margin: 0;
}

.principle-grid.compact {
  gap: 14px 18px;
}

.media-text {
  display: grid;
  grid-template-columns: minmax(220px, 360px) minmax(0, 1fr);
  gap: 22px;
  align-items: start;
  margin-top: 18px;
}

.media-text figure {
  margin: 0;
}

.media-text img,
.mini-project img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(50,45,41,.12);
  background: var(--paper-soft);
}

.process-list {
  display: grid;
  gap: 9px;
  margin: 16px 0 0;
  padding-left: 1.25em;
  color: var(--ink-soft);
}

.featured-projects {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mini-project {
  display: grid;
  gap: 9px;
}

.mini-project img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.mini-project strong {
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.45;
}

.mini-project span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.mini-project:hover strong {
  color: var(--clay-deep);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 22px;
}

.project-card {
  display: grid;
  gap: 10px;
}

.thumb {
  aspect-ratio: 4 / 3;
}

.facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 22px;
  margin: 24px 0;
}

.facts div {
  border-top: 1px solid rgba(50,45,41,.18);
  padding-top: 8px;
}

dt {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

dd {
  margin: 0;
}

.publication-list,
.contact-grid,
.resource-link-list {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.publication-list article,
.contact-grid section,
.resource-link-list a {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 18px;
  align-items: start;
  padding-top: 18px;
  border-top: 1px solid rgba(50,45,41,.16);
}

.resource-link-list a {
  grid-template-columns: minmax(120px, 180px) 1fr;
}

.resource-link-list strong {
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: 18px;
  font-weight: 400;
}

.resource-link-list span {
  color: var(--ink-soft);
}

.resource-link-list a:hover strong {
  color: var(--clay-deep);
}

.contact-grid section {
  grid-template-columns: 1fr;
}

.contact-entry-list {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.contact-link-card,
.contact-qr-card,
.member-card {
  display: grid;
  grid-template-columns: minmax(120px, 170px) minmax(0, 1fr);
  gap: 20px;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid rgba(50,45,41,.16);
}

.contact-link-card strong {
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: 22px;
  font-weight: 400;
}

.contact-link-card span,
.contact-qr-card p,
.member-card p {
  color: var(--ink-soft);
}

.contact-link-card:hover strong {
  color: var(--clay-deep);
}

.contact-qr-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-items: start;
  padding-top: 20px;
  border-top: 1px solid rgba(50,45,41,.16);
}

.contact-qr-list img,
.contact-qr-card img,
.member-card img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(50,45,41,.12);
  background: var(--paper-soft);
}

.contact-qr-list img,
.contact-qr-card img {
  max-width: none;
}

.member-grid {
  display: grid;
  gap: 0;
  max-width: 820px;
  margin-top: 30px;
}

.member-card {
  grid-template-columns: minmax(210px, 300px) minmax(0, 1fr);
  gap: 34px;
  align-items: start;
  padding: 30px 0;
}

.member-card.reverse {
  grid-template-columns: minmax(0, 1fr) minmax(210px, 300px);
}

.member-card.reverse .member-portrait {
  order: 2;
}

.member-card.reverse .member-copy {
  order: 1;
}

.member-portrait {
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center;
}

.member-card h2 {
  margin-bottom: 10px;
  font-size: 28px;
}

.member-card p {
  margin: 0;
}

.member-copy {
  display: grid;
  gap: 12px;
  padding-top: 2px;
}

.member-school {
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: 15px;
  line-height: 1.7;
}

.member-bio {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.92;
}

.book-cover {
  width: 110px;
  aspect-ratio: 3 / 4;
}

.text-cover {
  display: grid;
  place-items: center;
  color: var(--clay-deep);
  font-family: var(--font-serif);
  font-size: 18px;
  letter-spacing: .06em;
}

@media (max-width: 860px) {
  .site-header { padding: 20px 16px 0; }
  .brand-strip {
    flex-wrap: wrap;
    gap: 8px 18px;
    padding: 2px 0 16px;
  }
  .brand-note {
    margin-bottom: 4px;
    font-size: 13px;
  }
  .layout-shell {
    grid-template-columns: 1fr;
    gap: 22px;
    padding: 0 16px 50px;
  }
  .side-nav {
    position: static;
    max-width: none;
    min-height: auto;
    padding: 16px 0 20px 18px;
    border-right: 0;
    border-bottom: 1px solid rgba(50,45,41,.14);
    overflow: visible;
  }
  .nav-mark {
    margin-bottom: 18px;
  }
  .nav-section {
    margin-top: 22px;
  }
  .nav-title {
    font-size: 16px;
  }
  .nav-child {
    max-width: none;
    margin-left: 17px;
    padding-left: 0;
    font-size: 14px;
    white-space: nowrap;
  }
  .nav-article-list {
    padding-left: 0;
  }
  .nav-article {
    max-width: calc(100vw - 92px);
  }
  .quote-column {
    order: -1;
    padding-top: 0;
  }
  .project-grid,
  .facts,
  .publication-list article,
  .resource-link-list a,
  .contact-link-card,
  .contact-qr-card,
  .member-card {
    grid-template-columns: 1fr;
  }
  .member-card.reverse .member-portrait,
  .member-card.reverse .member-copy {
    order: initial;
  }
  .principle-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .media-text {
    grid-template-columns: 1fr;
  }
  .media-text figure {
    max-width: 560px;
  }
  .featured-projects {
    grid-template-columns: 1fr;
  }
  .mini-project {
    grid-template-columns: minmax(150px, 220px) minmax(0, 1fr);
    gap: 8px 16px;
    align-items: start;
    padding-top: 16px;
    border-top: 1px solid rgba(50,45,41,.14);
  }
  .mini-project img {
    grid-row: span 2;
  }
}

@media (max-width: 500px) {
  .mini-project {
    grid-template-columns: 1fr;
  }
  .mini-project img {
    grid-row: auto;
  }
}

.project-archive-study {
  display: grid;
  grid-template-columns: minmax(160px, 220px) minmax(0, 1fr);
  gap: 28px;
  margin-top: 24px;
}

.project-list-study {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--clay-deep);
}

.project-detail.compact {
  margin-top: 0;
}

.project-index-view {
  width: 100%;
  max-width: 820px;
}

.project-index-header {
  margin-bottom: 26px;
}

.article-card-list {
  display: grid;
  gap: 22px;
}

.article-card {
  display: grid;
  grid-template-columns: minmax(220px, 42%) minmax(0, 1fr);
  gap: 22px;
  align-items: stretch;
  padding-top: 22px;
  border-top: 1px solid rgba(50,45,41,.16);
}

.article-card-media {
  display: block;
  min-height: 180px;
  overflow: hidden;
  background: var(--paper-soft);
}

.project-index-view[data-section="earth-building"] .article-card {
  align-items: center;
}

.project-index-view[data-section="earth-building"] .article-card-media {
  aspect-ratio: 1 / 1;
  min-height: 0;
}

.article-card-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  border: 1px solid rgba(50,45,41,.12);
  transition: transform .2s ease;
}

.article-card:hover .article-card-media img {
  transform: scale(1.02);
}

.article-card-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 9px;
}

.article-card-meta {
  color: var(--muted);
  font-size: 12px;
}

.article-card-title {
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: 24px;
  line-height: 1.3;
}

.article-card-summary {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.75;
}

.article-card:hover .article-card-title {
  color: var(--clay-deep);
}

.media-video-list {
  display: grid;
  gap: 28px;
}

.media-video-card {
  display: grid;
  gap: 18px;
  padding: 18px 18px 22px;
  background: rgba(255,255,255,.68);
  border: 1px solid rgba(50,45,41,.14);
  border-radius: 6px;
  cursor: pointer;
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

.media-video-card:hover,
.media-video-card:focus-visible {
  border-color: rgba(123,63,43,.34);
  box-shadow: 0 14px 34px rgba(50,45,41,.08);
  transform: translateY(-1px);
  outline: 0;
}

.media-embed {
  display: grid;
  gap: 6px;
  margin: 0;
  cursor: auto;
}

.media-embed-main .article-video-frame {
  border-radius: 4px;
}

.media-embed-empty {
  min-height: 220px;
  overflow: hidden;
  background: var(--paper-soft);
  border: 1px solid rgba(50,45,41,.12);
}

.media-embed-empty img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.media-video-content {
  display: grid;
  gap: 10px;
  padding: 0 4px 2px;
}

.media-video-title {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: 24px;
  line-height: 1.35;
}

.media-video-card:hover .media-video-title,
.media-video-card:focus-visible .media-video-title {
  color: var(--clay-deep);
}

.media-video-summary {
  max-width: 720px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.85;
}

.podcast-episode-list {
  display: grid;
  gap: 0;
}

.podcast-episode-card {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 42px;
  gap: 18px;
  align-items: center;
  padding: 16px 0;
  border-top: 1px solid rgba(50,45,41,.12);
  cursor: pointer;
  transition: border-color .18s ease, transform .18s ease;
}

.podcast-episode-card:last-child {
  border-bottom: 1px solid rgba(50,45,41,.12);
}

.podcast-episode-card:hover,
.podcast-episode-card:focus-visible {
  border-color: rgba(123,63,43,.32);
  transform: translateX(2px);
  outline: 0;
}

.podcast-episode-cover {
  display: block;
  width: 72px;
  height: 72px;
  overflow: hidden;
  background: var(--paper-soft);
  border: 1px solid rgba(50,45,41,.12);
  border-radius: 4px;
}

.podcast-episode-cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.podcast-episode-content {
  display: grid;
  min-width: 0;
  gap: 5px;
}

.podcast-episode-title {
  color: var(--ink);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.45;
}

.podcast-episode-card:hover .podcast-episode-title,
.podcast-episode-card:focus-visible .podcast-episode-title {
  color: var(--clay-deep);
}

.podcast-episode-summary {
  display: -webkit-box;
  max-width: 640px;
  overflow: hidden;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.podcast-play-link {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  justify-self: end;
  border-radius: 50%;
  background: rgba(197,160,82,.16);
  transition: background .18s ease, transform .18s ease;
}

.podcast-play-link span {
  width: 0;
  height: 0;
  margin-left: 3px;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-left: 11px solid var(--clay-deep);
}

.podcast-play-link:hover,
.podcast-play-link:focus-visible {
  background: rgba(197,160,82,.28);
  transform: scale(1.06);
  outline: 0;
}

.podcast-play-link.disabled {
  opacity: .38;
  pointer-events: none;
}

.project-article {
  width: 100%;
  max-width: 820px;
}

.project-article-header {
  margin-bottom: 24px;
}

.article-back-link {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 13px;
}

.article-back-link:hover {
  color: var(--clay-deep);
}

.article-kicker {
  margin: 0 0 10px;
  color: var(--clay-deep);
  font-size: 13px;
}

.project-summary {
  max-width: 720px;
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--font-serif);
  font-size: 21px;
  line-height: 1.5;
}

.article-body {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

.article-body p {
  max-width: 720px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.9;
}

.article-link-line a {
  display: inline-flex;
  max-width: 100%;
  color: var(--clay-deep);
  font-family: var(--font-serif-cjk);
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.article-link-line a:hover {
  color: var(--ink);
}

.article-video {
  display: grid;
  gap: 8px;
  margin: 0;
}

.article-video-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #111;
  border: 1px solid rgba(50,45,41,.16);
}

.article-video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-lazy-frame {
  display: grid;
  place-items: center;
  background:
    linear-gradient(rgba(18,17,16,.34), rgba(18,17,16,.34)),
    radial-gradient(circle at 50% 48%, rgba(255,255,255,.16), transparent 34%),
    #141210;
}

.video-lazy-cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .68;
}

.video-play-button {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 74px;
  height: 74px;
  padding: 0;
  border: 1px solid rgba(255,255,255,.72);
  border-radius: 50%;
  background: rgba(50,45,41,.78);
  box-shadow: 0 14px 32px rgba(0,0,0,.22);
  cursor: pointer;
  transition: transform .16s ease, background .16s ease, border-color .16s ease;
}

.video-play-button span {
  display: block;
  width: 0;
  height: 0;
  margin-left: 5px;
  border-top: 14px solid transparent;
  border-bottom: 14px solid transparent;
  border-left: 22px solid #fff;
}

.video-play-button:hover,
.video-play-button:focus-visible {
  background: rgba(123,63,43,.88);
  border-color: #fff;
  transform: scale(1.04);
  outline: 0;
}

.article-video .article-caption a {
  color: var(--clay-deep);
}

.article-figure {
  margin: 0;
}

.article-caption {
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.article-figure.hero {
  margin-top: 16px;
}

.article-figure img,
.article-gallery img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--paper-soft);
  border: 1px solid rgba(50,45,41,.12);
}

.article-image-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.article-image-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  align-items: start;
}

.article-image-strip.qr-pair {
  width: 100%;
  max-width: 360px;
  margin: 8px auto 0;
}

.article-image-strip.qr-pair img {
  border: 0;
}

/* ---- 图片轮播 ---- */
.article-carousel {
  margin: 24px 0;
  outline: none;
}

.carousel-viewport {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  cursor: pointer;
}

.carousel-track {
  display: flex;
  transition: transform 0.35s ease;
  will-change: transform;
}

.carousel-slide {
  flex: 0 0 100%;
  min-width: 0;
  margin: 0;
}

.carousel-slide img {
  display: block;
  width: 100%;
  height: auto;
  border: 0;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 50%;
  background: rgba(255,255,255,.72);
  color: var(--ink);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity .2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.carousel-viewport:hover .carousel-btn {
  opacity: 1;
}

.carousel-prev {
  left: 10px;
}

.carousel-next {
  right: 10px;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 14px;
}

.carousel-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 0;
  padding: 0;
  background: rgba(50,45,41,.22);
  cursor: pointer;
  transition: background .2s;
}

.carousel-dot.active {
  background: var(--ink);
}

.article-section-title {
  margin: 18px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(50,45,41,.16);
  font-size: 24px;
}

.article-gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 34px;
}

.project-info-card {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid rgba(50,45,41,.18);
}

.project-info-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 24px;
  margin: 18px 0 0;
}

.project-info-list div {
  display: grid;
  gap: 4px;
  padding-top: 10px;
  border-top: 1px solid rgba(50,45,41,.12);
}

.article-footer-link {
  margin-top: 38px;
  padding-top: 20px;
  border-top: 1px solid rgba(50,45,41,.16);
}

.article-footer-link a {
  display: inline-block;
  color: var(--clay-deep);
  font-family: var(--font-serif-cjk);
  font-size: 18px;
  line-height: 1.4;
}

.article-footer-link a:hover {
  color: var(--ink);
}

/* ---- Article layout templates ---- */
.article-pullquote {
  max-width: 680px;
  margin: 8px 0;
  padding: 16px 0 16px 20px;
  border-left: 3px solid var(--clay-deep);
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: 19px;
  line-height: 1.7;
}

.article-list {
  display: grid;
  gap: 7px;
  max-width: 780px;
  margin: 0;
  padding-left: 22px;
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: 17px;
  line-height: 1.75;
}

.article-list li {
  padding-left: 6px;
}

.article-list strong {
  color: var(--ink);
  font-weight: 700;
}

.article-list a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: rgba(123,63,43,.38);
}

.article-list a:hover {
  color: var(--clay-deep);
  text-decoration-color: currentColor;
}

.article-divider {
  width: min(180px, 42%);
  margin: 12px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.article-layout-field-note {
  max-width: 880px;
}

.article-layout-field-note .project-article-header {
  display: grid;
  gap: 12px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(50,45,41,.14);
}

.article-layout-field-note .project-article-header h1 {
  max-width: 760px;
  color: var(--ink);
  font-family: var(--font-serif-cjk);
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 400;
  line-height: 1.22;
}

.article-layout-field-note .project-summary {
  padding-left: 18px;
  border-left: 4px solid var(--clay-deep);
  color: #5d554c;
}

.article-layout-field-note .article-body {
  gap: 24px;
}

.article-layout-field-note .article-figure {
  padding: 10px;
  background: #f3eee6;
}

.article-layout-field-note .article-section-title {
  width: min(720px, 100%);
  color: #526046;
  font-family: var(--font-serif-cjk);
}

.article-layout-essay {
  max-width: 740px;
}

.article-layout-essay .project-article-header h1 {
  font-family: var(--font-serif-cjk);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 400;
  line-height: 1.28;
}

.article-layout-essay .article-body {
  gap: 18px;
}

.article-layout-essay .article-body p {
  max-width: 66ch;
  font-family: var(--font-serif-cjk);
  font-size: 16px;
  line-height: 2;
}

.article-layout-essay .article-section-title {
  border-top: 0;
  font-family: var(--font-serif-cjk);
  text-align: center;
}

.article-layout-essay .article-section-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 1px;
  margin: 14px auto 0;
  background: var(--line);
}

.article-layout-essay .article-pullquote {
  border-left: 0;
  padding: 4px 24px;
  color: #5c5550;
  text-align: center;
  font-style: italic;
}

.article-layout-research {
  max-width: 900px;
}

.article-layout-research .project-article-header {
  padding: 22px 0 24px;
  border-top: 3px double rgba(50,45,41,.36);
  border-bottom: 1px solid rgba(50,45,41,.18);
}

.article-layout-research .project-article-header h1 {
  max-width: 780px;
  font-family: var(--font-serif-cjk);
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.32;
}

.article-layout-research .article-section-title {
  max-width: 760px;
  padding-top: 16px;
  border-top: 1px solid rgba(170,127,64,.38);
  color: #4f3c28;
}

.article-layout-research .project-info-card {
  max-width: 780px;
  padding: 18px;
  background: #f7ead9;
  border-top: 0;
  border-left: 4px solid var(--clay-deep);
}

.article-layout-gallery {
  max-width: 1040px;
}

.article-layout-gallery .project-article-header {
  max-width: 760px;
}

.article-layout-gallery .article-body {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  align-items: start;
}

.article-layout-gallery .article-body > p,
.article-layout-gallery .article-body > .article-section-title,
.article-layout-gallery .article-body > .article-link-line,
.article-layout-gallery .article-body > .article-carousel,
.article-layout-gallery .article-body > .article-video,
.article-layout-gallery .article-body > .article-pullquote,
.article-layout-gallery .article-body > .article-list,
.article-layout-gallery .article-body > .article-divider {
  grid-column: 1 / -1;
}

.article-layout-gallery .article-figure.hero,
.article-layout-gallery .article-figure:nth-of-type(3n + 1) {
  grid-column: 1 / -1;
}

.article-layout-gallery .article-figure img {
  border: 0;
}

.article-layout-media {
  max-width: 800px;
}

.article-layout-media .project-article-header {
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(50,45,41,.16);
}

.article-layout-media .project-article-header h1 {
  font-family: var(--font-serif-cjk);
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 400;
}

.article-layout-media .article-link-line a {
  padding: 11px 14px;
  border: 1px solid rgba(170,127,64,.32);
  background: rgba(217,189,144,.16);
}

.article-layout-announcement .project-article-header {
  padding: 24px;
  border: 2px solid var(--clay-deep);
  background: #fffaf1;
}

.article-layout-announcement .project-article-header h1 {
  color: #8f5d24;
  text-align: center;
}

@media (max-width: 860px) {
  .project-archive-study {
    grid-template-columns: 1fr;
  }
  .article-image-pair,
  .article-image-strip,
  .article-gallery,
  .article-card,
  .project-info-list {
    grid-template-columns: 1fr;
  }
  .podcast-episode-card {
    grid-template-columns: 58px minmax(0, 1fr) 34px;
    gap: 12px;
  }
  .podcast-episode-cover {
    width: 58px;
    height: 58px;
  }
  .podcast-episode-title {
    font-size: 16px;
  }
  .podcast-play-link {
    width: 32px;
    height: 32px;
  }
  .article-image-strip.qr-pair {
    max-width: 220px;
  }
  .project-summary {
    font-size: 20px;
  }
  .article-layout-gallery .article-body {
    grid-template-columns: 1fr;
  }
  .article-layout-gallery .article-figure.hero,
  .article-layout-gallery .article-figure:nth-of-type(3n + 1) {
    grid-column: auto;
  }
  .article-layout-announcement .project-article-header {
    padding: 18px;
  }
}