/* ===== Timeline component ===== */
:root {
  --anniversary-title-gradient: linear-gradient(
    to top,
    #b77934 0%,
    #dba862 28%,
    #f2cf91 54%,
    #fff3cf 76%,
    #fffdf5 100%
  );
  --anniversary-dialog-title-gradient: linear-gradient(
    to top,
    #9b5d1c 0%,
    #c47c24 18%,
    #e0a844 40%,
    #f5cc78 62%,
    #ffe8ad 82%,
    #fff4cf 100%
  );
  --anniversary-panel-border: rgba(136, 210, 255, 0.36);
  --anniversary-panel-border-strong: rgba(160, 224, 255, 0.58);
  --anniversary-dialog-blue-deep: #0c5a9a;
  --anniversary-dialog-blue: #198ed0;
  --anniversary-dialog-blue-soft: #8bdcff;
  --anniversary-dialog-border: rgba(156, 224, 255, 0.62);
  --anniversary-dialog-border-strong: rgba(213, 242, 255, 0.78);
  --anniversary-dialog-gold-border: rgba(226, 190, 125, 0.82);
  --anniversary-dialog-gold-border-strong: rgba(255, 232, 170, 0.96);
  --anniversary-dialog-gold-glow: rgba(255, 213, 124, 0.32);
}

.node-title,
.summary-title,
.summary-description,
.node-title-part,
.node-title-desktop {
  background-image: var(--anniversary-title-gradient);
  background-size: 100% 1lh;
  background-repeat: repeat-y;
  background-position: top left;
  background-clip: text;
  -webkit-background-clip: text;
  color: #f4c985;
  -webkit-text-fill-color: transparent;
}

.dialog-title-summary,
.dialog-intro-panel-title {
  background-image: var(--anniversary-dialog-title-gradient);
  background-size: 100% 1lh;
  background-repeat: repeat-y;
  background-position: top left;
  background-clip: text;
  background-origin: content-box;
  -webkit-background-clip: text;
  color: #ffe28a;
  -webkit-text-fill-color: transparent;
}

.dialog-title {
  background-image: var(--anniversary-title-gradient);
  background-size: 100% 1lh;
  background-repeat: repeat-y;
  background-position: top left;
  background-clip: text;
  -webkit-background-clip: text;
  color: #ffe28a;
  -webkit-text-fill-color: transparent;
}

.timeline {
  --timeline-axis-top: 54px;
  --timeline-node-padding-top: 12px;
  --timeline-node-height: 84px;
  position: relative;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(184, 148, 46, 0.3) transparent;
  padding: 0 0 24px;
  /*margin-top: -30px;*/
}

.timeline-track::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--timeline-axis-top);
  width: 100%;
  height: 2px;
  z-index: 1;
  border-radius: 99px;
  background: linear-gradient(90deg, transparent, #b8942e 6%, #d4a840 50%, #b8942e 94%, transparent);
  box-shadow: 0 0 10px rgba(184, 148, 46, 0.45);
  pointer-events: none;
}

.timeline-track {
  position: relative;
  display: flex;
  align-items: stretch;
  min-width: max-content;
}

.track-column {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  /*width: 140px;*/
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  transition: flex 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

.track-column.is-active {
  /*width: 280px;*/
  flex: 1.5 1 0;
}

/* 最后节点激活后最多占用42% */
.track-column.is-final.is-active {
  flex: 0 0 42%;
}

.node {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 0;
  margin: 0;
  color: #95abd2;
  font: inherit;
  background: transparent;
  cursor: pointer;
  appearance: none;
  padding: var(--timeline-node-padding-top) 6px 0;
  min-height: var(--timeline-node-height);
}

.node-title {
  min-height: 32px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.04em;
  text-shadow:
    0 0 8px rgba(255, 224, 143, 0.18),
    0 1px 8px rgba(8, 58, 132, 0.36);
  transition: color 200ms ease, font-size 300ms ease;
}

.node-title-part {
  display: block;
  width: 100%;
  text-align: center;
}

.node-title-desktop {
  display: inline;
}

.node-title-mobile {
  display: none;
}

.node-dot {
  position: absolute;
  top: var(--timeline-axis-top);
  left: 50%;
  z-index: 2;
  display: block;
  width: 20px;
  height: 20px;
  transform: translate(-50%, -50%);
  overflow: visible;
  transition:
    width 300ms cubic-bezier(0.4, 0, 0.2, 1),
    height 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.track-column.is-active .node-title {
  text-shadow:
    0 0 12px rgba(255, 225, 139, 0.54),
    0 2px 12px rgba(8, 61, 139, 0.46);
}

.track-column.is-active .node-dot {
  width: 28px;
  height: 28px;
}

.summary-item {
  position: relative;
  width: 100%;
  height: 240px;
  margin-top: 0;
  overflow: hidden;
  border-top: 1px solid var(--anniversary-panel-border);
  border-bottom: 1px solid var(--anniversary-panel-border);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.03) 42%),
    linear-gradient(180deg, rgba(103, 190, 255, 0.34), rgba(42, 137, 221, 0.26) 52%, rgba(12, 74, 157, 0.24));
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.08) inset,
    0 12px 28px rgba(4, 33, 89, 0.14);
  backdrop-filter: blur(16px);
  transition:
    background 300ms ease,
    border-color 300ms ease,
    box-shadow 300ms ease;
}

.track-column:first-child .summary-item {
  border-left: 1px solid var(--anniversary-panel-border);
  border-radius: 14px 0 0 14px;
}

.track-column:last-child .summary-item {
  border-right: 1px solid var(--anniversary-panel-border);
  border-radius: 0 14px 14px 0;
}

.track-column + .track-column .summary-item {
  border-left: 1px dashed rgba(255, 221, 135, 0.32);
}

.track-column.is-active .summary-item {
  border-color: var(--anniversary-panel-border-strong);
  background:
    radial-gradient(circle at 18% 8%, rgba(255, 228, 147, 0.26), transparent 30%),
    radial-gradient(circle at 78% 14%, rgba(139, 219, 255, 0.34), transparent 38%),
    linear-gradient(180deg, rgba(145, 214, 255, 0.5), rgba(55, 157, 233, 0.38) 54%, rgba(14, 88, 178, 0.3));
  box-shadow:
    0 0 0 1px rgba(255, 246, 219, 0.12) inset,
    0 0 24px rgba(78, 188, 255, 0.24),
    0 16px 34px rgba(4, 33, 89, 0.18);
}

.summary-copy {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  height: 100%;
  padding: 20px 14px 0 14px;
  text-align: left;
}

.summary-heading {
  width: 100%;
  min-width: 0;
}

.summary-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.04em;
  text-shadow:
    0 0 8px rgba(255, 224, 143, 0.18),
    0 1px 8px rgba(8, 58, 132, 0.36);
  transition: color 200ms ease, font-size 300ms ease;
}

.track-column.is-active .summary-title {
  font-size: 22px;
  text-shadow:
    0 0 12px rgba(255, 225, 139, 0.54),
    0 2px 12px rgba(8, 61, 139, 0.46);
}

.summary-description {
  margin: 6px 0 0;
  color: #f4c985;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: 0.04em;
  transition: color 300ms ease, font-size 300ms ease;
}

.track-column.is-active .summary-description {
  color: #ffe28a;
  font-size: 20px;
}

.summary-img-btn {
  display: block;
  margin-top: auto;
  width: 100%;
  height: 150px;
  overflow: hidden;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
  opacity: 0.68;
  transition: opacity 300ms ease, height 300ms ease;
}

.summary-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.summary-detail-btn {
  display: inline-block;
  margin-top: 8px;
  padding: 3px 2px;
  border: none;
  background: none;
  color: #b8942e;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.05em;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color 200ms ease;
}

.summary-detail-btn:hover {
  color: #ffe28a;
}

.summary-section-preview {
  width: 100%;
  margin-top: 14px;
}

.summary-section-preview[hidden] {
  display: none;
}

.summary-section-list {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  align-items: end;
  gap: 0 28px;
  width: 100%;
}

.summary-section-column {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: rgba(255, 244, 207, 0.92);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.45;
}

.summary-section-column li {
  display: flex;
  align-items: baseline;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.summary-section-column li::before {
  display: block;
  flex: 0 0 5px;
  width: 5px;
  height: 5px;
  margin: 0 7px 2px 0;
  border-radius: 50%;
  background: #ffe28a;
  box-shadow: 0 0 8px rgba(255, 226, 138, 0.72);
  content: "";
}

.summary-section-btn {
  display: block;
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  line-height: inherit;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
}

.summary-section-btn:hover,
.summary-section-btn:focus-visible {
  color: #fff3bf;
  outline: none;
}

/* 最后栏目激活后隐藏封面图，释放卡片空间给子栏目标题；图片数据本身不被删除。 */
.track-column.is-final.is-active.has-sections .summary-img-btn {
  display: none;
}

/* 两列按底部对齐。 */
.track-column.is-final.is-active.has-sections .summary-copy {
  overflow: hidden;
}

/* 最后栏目激活后，标题和摘要横向排列。 */
.track-column.is-final.is-active.has-sections .summary-heading {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.track-column.is-final.is-active.has-sections .summary-title {
  flex: 0 0 auto;
}

.track-column.is-final.is-active.has-sections .summary-description {
  min-width: 0;
  margin-top: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.track-column.is-final.is-active.has-sections .summary-section-preview {
  margin-top: 16px;
}

.track-column.is-active .summary-img-btn {
  opacity: 0.9;
  height: 170px;
}

/* ===== Demo container ===== */
* { box-sizing: border-box; }

body {
  --anniversary-hero-height: calc(100vw * 904 / 2350);
  --anniversary-timeline-bg-height: calc(100vw * 664 / 2350);
  margin: 0;
  min-height: 100vh;
  /*font-family: "Noto Serif SC", "Songti SC", serif;*/
  /*color: #d9e5f1;*/
  background-color: #03133d;
}

.anniversary-page {
  min-height: 100vh;
  background-color: #03133d;
}

.anniversary-banner {
  width: 100%;
  height: var(--anniversary-hero-height);
  background: url("https://www.cietac.org/sfs/anniversary70/hero_new.png") top center / 100% 100% no-repeat;
}

.anniversary-banner--en {
  background-image: url("https://www.cietac.org/sfs/anniversary70/hero_new_en.png");
}

.anniversary-timeline-section {
  position: relative;
  min-height: calc(100vh - var(--anniversary-hero-height));
  margin-top: 0;
  margin-left: -1px;
  padding-top: 1px;
  background-color: #03133d;
  background-image:
    url("https://www.cietac.org/sfs/anniversary70/hero-timeline-transition.png"),
    url("https://www.cietac.org/sfs/anniversary70/timeline-bg-new.png");
  background-position: top center, top center;
  background-repeat: no-repeat, no-repeat;
  background-size: 100% auto, 100% var(--anniversary-timeline-bg-height);
}

.demo-container {
  width: auto;
  max-width: none;
  min-height: calc(100vh - var(--anniversary-hero-height));
  padding-top: 1px;
}

.timeline-empty {
  padding: 120px 20px;
  color: rgba(217, 229, 241, 0.55);
  font-style: italic;
  text-align: center;
}

/* ===== Article dialog ===== */
.dialog-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  visibility: hidden;
  background:
    radial-gradient(circle at 50% 12%, rgba(77, 190, 255, 0.22), transparent 42%),
    radial-gradient(circle at 50% 100%, rgba(255, 213, 124, 0.14), transparent 40%),
    rgba(3, 19, 61, 0.48);
  opacity: 0;
  backdrop-filter: blur(8px);
  /*transition: opacity 300ms ease, visibility 300ms ease;*/
}

.dialog-overlay.is-visible {
  visibility: visible;
  opacity: 1;
}

.dialog-container {
  --dialog-main-rows: minmax(92px, 0.8fr) minmax(0, 5fr);
  --dialog-content-rows: minmax(0, 2.1fr) minmax(0, 3fr);
  --dialog-gallery-card-rows: minmax(0, 2fr) minmax(96px, 1fr);
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  width: 90vw;
  height: 90vh;
  min-height: min(620px, 90vh);
  max-height: 90vh;
  overflow: hidden;
  border: 1px solid var(--anniversary-dialog-gold-border);
  border-radius: 12px;
  background:
    radial-gradient(circle at 82% 8%, rgba(255, 226, 138, 0.24), transparent 32%),
    radial-gradient(circle at 16% 0%, rgba(139, 220, 255, 0.34), transparent 36%),
    linear-gradient(180deg, rgba(58, 181, 242, 0.94), rgba(25, 142, 208, 0.96) 38%, rgba(12, 90, 154, 0.97));
  box-shadow:
    0 0 0 1px rgba(255, 248, 226, 0.18) inset,
    0 0 34px rgba(255, 213, 124, 0.18),
    0 0 54px rgba(77, 190, 255, 0.2),
    0 24px 74px rgba(0, 0, 0, 0.32);
  color: #f2f9ff;
  transform: translateY(18px) scale(0.96);
  transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.dialog-container::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(90deg, transparent 0, rgba(255, 232, 170, 0.18) 50%, transparent 100%),
    linear-gradient(rgba(242, 250, 253, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 250, 253, 0.07) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  mask-image: linear-gradient(180deg, transparent 0, #000 18%, #000 84%, transparent 100%);
  opacity: 0.22;
  pointer-events: none;
}

.dialog-overlay.is-visible .dialog-container {
  transform: translateY(0) scale(1);
}

.dialog-main {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: var(--dialog-main-rows);
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background:
    var(--dialog-header-image, linear-gradient(90deg, rgba(27, 74, 119, 0.72), rgba(72, 134, 171, 0.34)))
    right center / cover no-repeat;
}

.dialog-main::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(130% 170% at 0% 100%, rgba(9, 80, 151, 0.62) 0%, rgba(31, 132, 202, 0.52) 38%, rgba(139, 220, 255, 0.32) 62%, rgba(255, 226, 138, 0.12) 80%, rgba(25, 142, 208, 0.1) 100%),
    linear-gradient(35deg, rgba(8, 58, 132, 0.56) 0%, rgba(25, 142, 208, 0.42) 45%, rgba(139, 220, 255, 0.24) 74%, rgba(255, 226, 138, 0.12) 100%);
  pointer-events: none;
}

.dialog-main::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(90deg, rgba(255, 232, 170, 0.14), transparent 40%),
    linear-gradient(rgba(242, 250, 253, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 250, 253, 0.06) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  mix-blend-mode: normal;
  opacity: 0.16;
  pointer-events: none;
}

.dialog-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-width: 0;
  padding: 20px 82px 8px 34px;
  border-bottom: 1px solid rgba(255, 226, 138, 0.24);
}

.dialog-header-copy {
  position: relative;
  z-index: 1;
  flex: 1 1 auto;
  min-width: 0;
}

.dialog-title {
  margin: 0;
  font-size: 54px;
  font-weight: 700;
  line-height: 1.1;
  text-shadow:
    0 1px 0 rgba(255, 246, 202, 0.28),
    0 0 8px rgba(255, 213, 124, 0.24),
    0 2px 8px rgba(9, 63, 137, 0.42);
}

/* 最后栏目详情不显示左侧目录，标题使用更紧凑的字号。 */
.dialog-main.is-section-detail .dialog-title {
  font-size: 36px;
  line-height: 1.16;
}

.dialog-main.is-section-detail .dialog-header-aside {
  display: none;
}

.dialog-title-summary {
  max-width: 760px;
  max-height: 68px;
  margin-top: 8px;
  overflow: hidden;
  font-size: 30px;
  font-weight: 700;
  line-height: 1.45;
  text-shadow:
    0 1px 0 rgba(255, 246, 202, 0.32),
    0 0 8px rgba(255, 213, 124, 0.28),
    0 2px 7px rgba(9, 63, 137, 0.48),
    0 4px 12px rgba(0, 0, 0, 0.3);
}

.dialog-title-summary[hidden] {
  display: none;
}

.dialog-header-aside {
  position: relative;
  z-index: 1;
  flex: 0 1 40%;
  min-width: 0;
}

.dialog-close {
  position: absolute;
  top: 18px;
  right: 20px;
  z-index: 3;
  font-size: 0;
}

.dialog-close::before {
  content: "";
  display: block;
  width: 24px;
  height: 24px;
  background: url("/images/anniversary70/button/close.svg") center / contain no-repeat;
}

.dialog-content {
  --dialog-nav-width: 46px;
  --dialog-gallery-gap: 16px;
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-rows: var(--dialog-content-rows);
  gap: 30px;
  min-width: 0;
  min-height: 0;
  padding: 4px 28px 26px;
  overflow: hidden;
}

.dialog-intro-row {
  display: block;
  width: calc(100% - (var(--dialog-nav-width) + var(--dialog-gallery-gap)) * 2);
  max-width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  margin: 0 auto;
  overflow: hidden;
}

.dialog-intro-panel {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border-radius: 8px;
}

.dialog-intro-panel-title {
  flex: 0 0 auto;
  padding: 13px 16px 12px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
  text-shadow:
    0 1px 0 rgba(255, 246, 202, 0.28),
    0 0 8px rgba(255, 213, 124, 0.24),
    0 2px 8px rgba(9, 63, 137, 0.42);
}

.dialog-intro-panel-body {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  border: 1px solid var(--anniversary-dialog-gold-border);
  border-radius: 8px;
  padding: 12px 16px 15px;
  background:
    linear-gradient(180deg, rgba(233, 249, 255, 0.2), rgba(71, 172, 230, 0.16) 40%, rgba(10, 86, 164, 0.34)),
    rgba(18, 116, 184, 0.5);
  box-shadow:
    0 0 0 1px rgba(255, 248, 226, 0.18) inset,
    0 0 18px var(--anniversary-dialog-gold-glow),
    0 12px 28px rgba(0, 0, 0, 0.14);
  backdrop-filter: blur(8px);
  color: rgba(246, 251, 255, 0.94);
  font-size: 14px;
  line-height: 1.75;
  overflow-wrap: anywhere;
  word-break: break-word;
  scrollbar-width: thin;
  scrollbar-color: rgba(133, 184, 216, 0.56) transparent;
}

.dialog-intro-panel-body::-webkit-scrollbar,
.dialog-gallery-card-body::-webkit-scrollbar {
  width: 6px;
}

.dialog-intro-panel-body::-webkit-scrollbar-thumb,
.dialog-gallery-card-body::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: rgba(133, 184, 216, 0.56);
}

.dialog-intro-panel-body p {
  margin: 0 0 0.8em;
}

.dialog-intro-panel-body img,
.dialog-intro-panel-body video,
.dialog-intro-panel-body iframe {
  max-width: 100% !important;
}

.dialog-intro-panel-body img,
.dialog-intro-panel-body video {
  height: auto !important;
}

.dialog-gallery-row {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  padding: 0;
}

.dialog-gallery {
  flex: 1 1 auto;
  width: 100%;
  max-width: 100%;
  height: 100%;
  min-width: 0;
  overflow: hidden;
}

.dialog-gallery-shell {
  position: relative;
  flex: 1 1 auto;
  display: flex;
  align-items: stretch;
  gap: var(--dialog-gallery-gap);
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.anniversary-dialog-swiper {
  width: 100%;
  max-width: 100%;
  height: 100%;
  min-width: 0;
  overflow: hidden;
}

.anniversary-dialog-swiper .swiper-wrapper {
  height: 100%;
  align-items: flex-start;
}

.anniversary-dialog-swiper .swiper-slide {
  display: flex;
  align-items: stretch;
  justify-content: flex-start;
  width: min(360px, 100%);
  max-width: 100%;
  height: 100%;
  max-height: none;
  opacity: 1;
  transition: opacity 240ms ease;
}

.dialog-gallery-card {
  position: relative;
  display: grid;
  grid-template-rows: var(--dialog-gallery-card-rows);
  width: 100%;
  max-width: 360px;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--anniversary-dialog-gold-border);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(233, 249, 255, 0.22), transparent 34%),
    linear-gradient(180deg, rgba(35, 142, 203, 0.88), rgba(20, 105, 174, 0.9) 52%, rgba(12, 90, 154, 0.92));
  box-shadow:
    0 0 0 1px rgba(255, 248, 226, 0.16) inset,
    0 0 18px var(--anniversary-dialog-gold-glow),
    0 16px 34px rgba(0, 0, 0, 0.18);
}

.dialog-gallery-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 14px;
  left: 14px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 242, 203, 0.88), rgba(226, 190, 125, 0.62), transparent);
  pointer-events: none;
}

.dialog-gallery-card-cover {
  min-height: 0;
  box-sizing: border-box;
  padding: 10px 10px 0;
}

.dialog-cover-btn {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  max-height: none;
  overflow: hidden;
  border: 1px solid rgba(255, 226, 138, 0.42);
  border-radius: 6px;
  padding: 0;
  background:
    linear-gradient(180deg, rgba(139, 220, 255, 0.18), rgba(12, 90, 154, 0.2)),
    rgba(16, 105, 174, 0.3);
  box-shadow: 0 0 0 1px rgba(213, 242, 255, 0.16) inset;
  cursor: zoom-in;
}

.dialog-cover-btn img {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

.dialog-cover-bg {
  object-fit: cover;
  filter: blur(12px);
  opacity: 0.34;
  transform: scale(1.08);
}

.dialog-cover-img {
  z-index: 1;
  object-fit: contain;
  transition: transform 260ms ease;
}

.dialog-cover-btn:hover .dialog-cover-img {
  transform: scale(1.04);
}

.dialog-cover-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  max-height: none;
  border: 1px dashed rgba(255, 226, 138, 0.5);
  border-radius: 6px;
  color: rgba(255, 240, 168, 0.68);
  font-size: 13px;
}

.dialog-gallery-card-copy {
  display: flex;
  flex-direction: column;
  min-height: 0;
  box-sizing: border-box;
  padding: 10px 12px 12px;
}

.dialog-gallery-card-body {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  max-height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  color: rgba(246, 251, 255, 0.92);
  font-size: 13px;
  line-height: 1.65;
  overflow-wrap: anywhere;
  word-break: break-word;
  overscroll-behavior: auto;
  touch-action: pan-y;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(133, 184, 216, 0.56) transparent;
}

.dialog-gallery-card-body p {
  margin: 0 0 0.8em;
}

.dialog-gallery-card-body img,
.dialog-gallery-card-body video,
.dialog-gallery-card-body iframe {
  max-width: 100% !important;
}

.dialog-gallery-card-body img,
.dialog-gallery-card-body video {
  height: auto !important;
  max-height: 160px;
  object-fit: contain;
}

.dialog-gallery-card-body table {
  display: block;
  width: 100% !important;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

/* 结构化栏目中的文章沿用原数字画廊的横向卡片布局，每个栏目各自占一行。 */
.dialog-structured-gallery {
  position: relative;
  display: flex;
  align-items: stretch;
  gap: 12px;
  width: 100%;
  height: 286px;
  min-width: 0;
  min-height: 0;
  margin-top: 15px;
}

.dialog-structured-swiper {
  flex: 1 1 auto;
  width: 100%;
  height: 100%;
  min-width: 0;
  overflow: hidden;
}

.dialog-structured-swiper.is-native-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(133, 184, 216, 0.56) transparent;
  scroll-snap-type: x mandatory;
}

.dialog-structured-swiper .swiper-wrapper {
  height: 100%;
  align-items: stretch;
}

.dialog-structured-swiper .swiper-slide {
  display: flex;
  align-items: stretch;
  justify-content: flex-start;
  width: min(360px, 100%);
  height: 100%;
}

.dialog-structured-swiper.is-native-scroll .swiper-wrapper {
  width: max-content;
  min-width: 100%;
}

.dialog-structured-swiper.is-native-scroll .swiper-slide {
  flex: 0 0 360px;
  width: 360px;
  scroll-snap-align: start;
}

.dialog-structured-gallery .dialog-gallery-card {
  max-width: 360px;
}

/* 导航按钮始终占位；不可翻页时由.swiper-button-disabled负责置灰*/
.dialog-structured-nav {
  align-self: center;
  width: 38px;
  height: 38px;
}

/* ===== Structured category detail ===== */
/* 结构化内容位于背景装饰层之上，避免网格蒙版影响正文阅读。 */
.dialog-main.is-structured .dialog-structured-content {
  grid-row: 2;
}

.dialog-structured-content {
  position: relative;
  z-index: 2;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.dialog-content[hidden],
.dialog-structured-content[hidden] {
  display: none;
}

.dialog-structured-layout {
  display: grid;
  grid-template-columns: minmax(170px, 0.24fr) minmax(0, 1fr);
  gap: 24px;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  padding: 8px 28px 26px;
}

.dialog-main.is-section-detail .dialog-structured-layout {
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.dialog-main.is-section-detail .dialog-structured-scroller {
  padding-right: 0;
}

/* 桌面端目录独立滚动，目录按钮通过sectionId定位右侧内容。 */
.dialog-structure-nav {
  min-width: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  padding: 10px 18px 12px 0;
  border-right: 1px solid rgba(255, 226, 138, 0.3);
  scrollbar-width: thin;
  scrollbar-color: rgba(133, 184, 216, 0.56) transparent;
}

.dialog-structure-nav-title,
.dialog-structure-kicker {
  color: #ffe28a;
  font-weight: 700;
  line-height: 1.4;
  text-shadow: 0 0 10px rgba(255, 213, 124, 0.34);
}

.dialog-structure-kicker {
  font-size: 22px;
}

.dialog-structure-nav-title {
  font-size: 16px;
}

.dialog-structure-nav-title {
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 226, 138, 0.24);
}

.dialog-structure-nav-list,
.dialog-structure-nav-children {
  margin: 0;
  padding: 0;
  list-style: none;
}

.dialog-structure-nav-list {
  padding-top: 6px;
}

.dialog-structure-nav-children {
  padding-left: 14px;
}

.dialog-structure-nav-btn {
  display: block;
  width: 100%;
  padding: 7px 0;
  border: 0;
  background: transparent;
  color: rgba(240, 249, 255, 0.78);
  font: inherit;
  font-size: 13px;
  line-height: 1.45;
  text-align: left;
  cursor: pointer;
  transition: color 180ms ease, padding-left 180ms ease;
}

.dialog-structure-nav-level-1 > .dialog-structure-nav-btn {
  color: #f4d68b;
  font-weight: 700;
}

.dialog-structure-nav-btn:hover,
.dialog-structure-nav-btn:focus-visible {
  padding-left: 6px;
  color: #fff3bf;
  outline: none;
}

.dialog-structured-scroller {
  min-width: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  padding: 0 8px 6px 0;
  scrollbar-width: thin;
  scrollbar-color: rgba(133, 184, 216, 0.56) transparent;
  scroll-behavior: smooth;
}

.dialog-structure-intro,
.dialog-structure-section {
  min-width: 0;
  padding: 12px 0 22px;
  scroll-margin-top: 12px;
}

.dialog-structure-intro {
  padding-top: 6px;
  border-bottom: 1px solid rgba(255, 226, 138, 0.3);
}

/* 特殊子栏目的父栏目content单独占一块，父栏目summary由弹框标题承载。 */
.dialog-structure-parent-intro {
  min-width: 0;
  margin-bottom: 4px;
  padding: 6px 0 0;
}

/* 父栏目content和子栏目content共用面板样式，保持边框、滚动方式和尺寸一致。 */
.dialog-structure-content-panel {
  box-sizing: border-box;
  min-width: 0;
  overflow-x: hidden;
  overflow-y: auto;
  border: 1px solid var(--anniversary-dialog-gold-border);
  border-radius: 8px;
  padding: 12px 16px 15px;
  background:
    linear-gradient(180deg, rgba(233, 249, 255, 0.2), rgba(71, 172, 230, 0.16) 40%, rgba(10, 86, 164, 0.34)),
    rgba(18, 116, 184, 0.5);
  box-shadow:
    0 0 0 1px rgba(255, 248, 226, 0.18) inset,
    0 0 18px var(--anniversary-dialog-gold-glow),
    0 12px 28px rgba(0, 0, 0, 0.14);
  backdrop-filter: blur(8px);
  color: rgba(246, 251, 255, 0.92);
  font-size: 14px;
  line-height: 1.75;
  overflow-wrap: anywhere;
  word-break: break-word;
  scrollbar-width: thin;
  scrollbar-color: rgba(133, 184, 216, 0.56) transparent;
}

/* 缩短特殊详情中的两个content面板，为下方子栏目内容和数字画廊保留可滚动空间。 */
.dialog-main.is-first-section-detail {
  --dialog-first-section-content-height: clamp(180px, 26vh, 300px);
}

.dialog-main.is-first-section-detail .dialog-structure-content-panel {
  height: var(--dialog-first-section-content-height);
}

/* 由外层结构化内容统一纵向滚动，保证双content之后的数字画廊仍可继续查看。 */
.dialog-main.is-first-section-detail .dialog-structured-content {
  overflow-x: hidden;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(133, 184, 216, 0.56) transparent;
}

.dialog-main.is-first-section-detail .dialog-structured-layout {
  height: auto;
  min-height: 100%;
}

.dialog-main.is-first-section-detail .dialog-structured-scroller {
  height: auto;
  overflow: visible;
  padding-bottom: 12px;
}

/* 保持父栏目content与子栏目content之间的视觉分隔，避免内容和数字画廊粘连。 */
.dialog-structure-parent-content {
  margin-bottom: 12px;
}

.dialog-structure-current-content {
  margin-top: 8px;
}

.dialog-structure-content-panel::-webkit-scrollbar {
  width: 6px;
}

.dialog-structure-content-panel::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: rgba(133, 184, 216, 0.56);
}

.dialog-structure-content-panel p {
  margin: 0 0 0.75em;
}

.dialog-structure-content-panel img,
.dialog-structure-content-panel video,
.dialog-structure-content-panel iframe {
  max-width: 100% !important;
}

.dialog-structure-content-panel img,
.dialog-structure-content-panel video {
  height: auto !important;
}

.dialog-structure-description {
  margin-top: 8px;
  color: rgba(246, 251, 255, 0.92);
  font-size: 14px;
  line-height: 1.75;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.dialog-structure-description p {
  margin: 0 0 0.75em;
}

.dialog-structure-description img,
.dialog-structure-description video,
.dialog-structure-description iframe {
  max-width: 100% !important;
}

.dialog-structure-description img,
.dialog-structure-description video {
  height: auto !important;
}

.dialog-structure-section {
  border-bottom: 1px solid rgba(255, 226, 138, 0.22);
}

.dialog-structure-heading {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.dialog-structure-index {
  flex: 0 0 auto;
  color: rgba(255, 226, 138, 0.62);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.dialog-structure-title {
  min-width: 0;
  margin: 0;
  color: #fff0b1;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
  overflow-wrap: anywhere;
  word-break: break-word;
  text-shadow: 0 0 10px rgba(255, 213, 124, 0.26);
}

.dialog-structure-level-2 {
  margin-top: 14px;
  padding: 13px 14px 17px 18px;
  border-left: 3px solid rgba(139, 220, 255, 0.74);
  border-bottom: 0;
  background: rgba(4, 83, 149, 0.24);
}

.dialog-structure-level-2 .dialog-structure-title {
  font-size: 17px;
  color: #fff;
  font-weight: 600;
  text-shadow: 0 0 8px rgba(139, 220, 255, 0.24);
}

.dialog-structure-level-2 .dialog-structure-index {
  color: rgba(139, 220, 255, 0.88);
}

.dialog-structure-children {
  margin-top: 4px;
}

.dialog-article-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 12px;
  margin-top: 14px;
}

.dialog-article-item {
  display: flex;
  align-items: stretch;
  gap: 10px;
  min-width: 0;
  min-height: 122px;
  padding: 12px;
  border: 1px solid rgba(255, 226, 138, 0.38);
  border-radius: 7px;
  background:
    linear-gradient(180deg, rgba(233, 249, 255, 0.16), rgba(71, 172, 230, 0.1)),
    rgba(8, 90, 156, 0.42);
  box-shadow: 0 0 0 1px rgba(255, 248, 226, 0.08) inset;
}

.dialog-article-copy {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  min-width: 0;
}

.dialog-article-title {
  margin: 0;
  color: #fff1b5;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.dialog-article-body {
  flex: 1 1 auto;
  min-width: 0;
  max-height: 176px;
  margin-top: 7px;
  overflow-x: hidden;
  overflow-y: auto;
  color: rgba(246, 251, 255, 0.88);
  font-size: 13px;
  line-height: 1.65;
  overflow-wrap: anywhere;
  word-break: break-word;
  scrollbar-width: thin;
  scrollbar-color: rgba(133, 184, 216, 0.56) transparent;
}

.dialog-article-body p {
  margin: 0 0 0.75em;
}

.dialog-article-body img,
.dialog-article-body video,
.dialog-article-body iframe {
  max-width: 100% !important;
}

.dialog-article-body img,
.dialog-article-body video {
  height: auto !important;
  max-height: 150px;
  object-fit: contain;
}

.dialog-article-image {
  position: relative;
  flex: 0 0 88px;
  align-self: flex-start;
  width: 88px;
  height: 72px;
  overflow: hidden;
  padding: 0;
  border: 1px solid rgba(255, 226, 138, 0.42);
  border-radius: 5px;
  background: rgba(16, 105, 174, 0.3);
  cursor: zoom-in;
}

.dialog-article-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.dialog-empty {
  padding: 12px 0;
  color: rgba(255, 240, 168, 0.68);
  font-style: italic;
  text-align: center;
}

.dialog-nav,
.dialog-close,
.dialog-image-preview-close,
.dialog-image-preview-download {
  --swiper-navigation-size: 18px;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  margin: 0;
  border: 1px solid var(--anniversary-dialog-gold-border);
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 35%, rgba(255, 240, 168, 0.26), transparent 58%),
    linear-gradient(145deg, rgba(45, 158, 222, 0.96), rgba(12, 90, 154, 0.96));
  box-shadow:
    0 0 0 1px rgba(255, 248, 226, 0.16) inset,
    0 0 14px var(--anniversary-dialog-gold-glow),
    0 10px 28px rgba(0, 0, 0, 0.18);
  color: #ffe28a;
  line-height: 1;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: background 200ms ease, border-color 200ms ease, box-shadow 200ms ease, color 200ms ease, opacity 200ms ease, transform 200ms ease;
}

.dialog-nav {
  position: static;
  align-self: center;
}

.dialog-nav::after {
  font-size: 18px;
  font-weight: 700;
}

@media (hover: hover) and (pointer: fine) {
  .dialog-nav:hover,
  .dialog-close:hover,
  .dialog-image-preview-close:hover,
  .dialog-image-preview-download:hover {
    border-color: var(--anniversary-dialog-gold-border-strong);
    background:
      radial-gradient(circle at 50% 35%, rgba(255, 247, 221, 0.34), transparent 54%),
      linear-gradient(145deg, rgba(77, 190, 255, 0.98), rgba(18, 116, 184, 0.98));
    box-shadow:
      0 0 0 1px rgba(255, 247, 221, 0.2) inset,
      0 0 20px rgba(249, 222, 160, 0.4),
      0 12px 30px rgba(0, 0, 0, 0.22);
    color: #fff0a8;
    transform: scale(1.04);
  }
}

.dialog-nav:active,
.dialog-close:active,
.dialog-image-preview-close:active,
.dialog-image-preview-download:active {
  border-color: var(--anniversary-dialog-gold-border-strong);
  background:
    radial-gradient(circle at 50% 35%, rgba(255, 247, 221, 0.34), transparent 54%),
    linear-gradient(145deg, rgba(77, 190, 255, 0.98), rgba(18, 116, 184, 0.98));
  box-shadow:
    0 0 0 1px rgba(255, 247, 221, 0.2) inset,
    0 0 20px rgba(249, 222, 160, 0.4),
    0 12px 30px rgba(0, 0, 0, 0.22);
  color: #fff0a8;
  transform: scale(0.97);
}

.dialog-nav.swiper-button-disabled {
  opacity: 0.32;
}

.dialog-nav.swiper-button-lock {
  display: none;
}

.dialog-image-preview {
  position: fixed;
  inset: 0;
  z-index: 2300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  visibility: hidden;
  background:
    radial-gradient(circle at 50% 18%, rgba(148, 211, 238, 0.3), transparent 42%),
    linear-gradient(180deg, rgba(48, 112, 153, 0.68), rgba(23, 74, 122, 0.72)),
    rgba(18, 61, 105, 0.66);
  opacity: 0;
  backdrop-filter: blur(5px);
  transition: opacity 220ms ease, visibility 220ms ease;
}

.dialog-image-preview.is-visible {
  visibility: visible;
  opacity: 1;
}

.dialog-image-preview-img {
  box-sizing: border-box;
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border: 1px solid var(--anniversary-dialog-gold-border-strong);
  border-radius: 6px;
  box-shadow:
    0 0 0 1px rgba(255, 248, 226, 0.18) inset,
    0 0 30px rgba(249, 222, 160, 0.26),
    0 22px 70px rgba(0, 0, 0, 0.34);
}

.dialog-image-preview-close {
  position: absolute;
  top: 24px;
  right: 28px;
  font-size: 0;
}

.dialog-image-preview-download {
  position: absolute;
  top: 82px;
  right: 28px;
  font-size: 0;
}

.dialog-image-preview-close::before {
  content: "";
  display: block;
  width: 24px;
  height: 24px;
  background: url("/images/anniversary70/button/close.svg") center / contain no-repeat;
}

.dialog-image-preview-download::before {
  content: "";
  display: block;
  width: 24px;
  height: 24px;
  background: url("/images/anniversary70/button/download.svg") center / contain no-repeat;
}

@media (max-width: 1024px) {
  .demo-container {
    padding-top: 1px;
  }

  .dialog-container {
    --dialog-main-rows: minmax(88px, 0.75fr) minmax(0, 5.2fr);
    --dialog-content-rows: minmax(0, 1.8fr) minmax(0, 3fr);
    --dialog-gallery-card-rows: minmax(0, 1.65fr) minmax(92px, 1fr);
    min-height: min(560px, 90vh);
  }

  .dialog-header {
    padding: 16px 74px 8px 24px;
  }

  .dialog-title {
    font-size: 36px;
    line-height: 1.12;
  }

  .dialog-main.is-section-detail .dialog-title {
    font-size: 30px;
  }

  .dialog-title-summary {
    max-height: 52px;
    font-size: 18px;
    line-height: 1.45;
  }

  .dialog-content {
    --dialog-nav-width: 42px;
    --dialog-gallery-gap: 12px;
    gap: 20px;
    padding: 6px 18px 18px;
  }

  .dialog-gallery-row {
    padding: 0;
  }

  .dialog-gallery-shell {
    gap: var(--dialog-gallery-gap);
  }

  .anniversary-dialog-swiper .swiper-slide {
    width: min(320px, 100%);
    max-height: none;
  }

  .dialog-gallery-card {
    max-width: 320px;
  }

  .dialog-nav {
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 640px) {
  .dialog-header {
    padding-right: 74px;
  }

  .dialog-header-aside {
    display: none;
  }

  .dialog-title {
    white-space: nowrap;
  }


@media (max-width: 575.98px) {
  .demo-container {
    padding-top: 1px;
  }

  .anniversary-timeline-section {
    background-color: #0c5a9a;
    background-image:
      url("https://www.cietac.org/sfs/anniversary70/hero-timeline-transition-mobile.png"),
      linear-gradient(180deg, rgba(32, 132, 205, 0.24), rgba(18, 95, 163, 0.18)),
      url("https://www.cietac.org/sfs/anniversary70/timeline-bg-mobile.png");
    background-position: top center, top center, top center;
    background-repeat: no-repeat, no-repeat, repeat-y;
    background-size: 100% auto, 100% 100%, 100% auto;
  }

  .dialog-gallery-shell {
    gap: 0;
  }

  .dialog-nav {
    position: absolute;
    top: clamp(54px, 26%, 138px);
    z-index: 4;
    width: 40px;
    height: 40px;
    transform: translateY(-50%);
  }

  .dialog-nav-prev {
    left: 18px;
  }

  .dialog-nav-next {
    right: 18px;
  }
}

  .timeline {
    --timeline-mobile-label-width: 76px;
    --timeline-mobile-dot-width: 30px;
    --timeline-mobile-column-gap: 6px;
    --timeline-mobile-axis-left: calc(
      var(--timeline-mobile-label-width) + var(--timeline-mobile-column-gap) +
        var(--timeline-mobile-dot-width) / 2
    );
  }

  .timeline {
    overflow-x: visible;
    padding: 4px 14px 30px;
  }

  .timeline-track {
    flex-direction: column;
    min-width: 0;
    width: 100%;
  }

  .timeline-track::before {
    left: var(--timeline-mobile-axis-left);
    top: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, transparent, #b8942e 3%, #d4a840 50%, #b8942e 97%, transparent);
  }

  .track-column {
    flex: none;
    width: 100%;
    display: grid;
    grid-template-columns: var(--timeline-mobile-label-width) var(--timeline-mobile-dot-width) minmax(0, 1fr);
    align-items: stretch;
    column-gap: var(--timeline-mobile-column-gap);
    transition: none;
  }

  .track-column.is-active {
    flex: none;
  }

  .track-column.is-final.is-active {
    flex: none;
  }

  /* 移动端按内容自然增高，确保子栏目不通过内部滚动展示。 */
  .track-column.is-final.has-sections .summary-item {
    height: auto;
    min-height: 200px;
  }

  .track-column + .track-column {
    margin-top: 12px;
  }

  .node {
    grid-column: 1;
    width: auto;
    min-height: 0;
    align-items: flex-end;
    padding: 14px 0;
  }

  .node-title {
    display: block;
    min-height: 0;
    font-size: 14px;
    line-height: 1.2;
    letter-spacing: 0.04em;
    width: 100%;
    text-align: right;
  }

  .node-title-desktop {
    display: none;
  }

  .node-title-mobile {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 5px;
    width: max-content;
    max-width: 100%;
    margin-left: auto;
  }

  .node-title-part {
    width: auto;
    text-align: right;
  }

  .node-dot {
    top: 24px;
    left: var(--timeline-mobile-axis-left);
  }

  .summary-item {
    grid-column: 3;
    width: 100%;
    min-width: 0;
    height: auto;
    min-height: 156px;
    margin-top: 0;
    border: 1px solid var(--anniversary-panel-border);
    border-radius: 10px;
  }

  .track-column:first-child .summary-item,
  .track-column:last-child .summary-item {
    border: 1px solid var(--anniversary-panel-border);
    border-radius: 10px;
  }

  .track-column + .track-column .summary-item {
    border-left: 1px solid var(--anniversary-panel-border);
  }

  .summary-copy {
    padding: 16px 14px 14px;
  }

  .summary-title {
    display: none;
    font-size: 15px;
    line-height: 1.35;
  }

  .track-column.is-active .summary-title {
    font-size: 18px;
  }

  .summary-description {
    background-image: var(--anniversary-title-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    color: #f4c985;
    -webkit-text-fill-color: transparent;
    font-size: 14px;
    line-height: 1.5;
  }

  .track-column.is-active .summary-description {
    color: #ffe28a;
    font-size: 16px;
  }

  .summary-img-btn,
  .track-column.is-active .summary-img-btn {
    margin-top: 8px;
    height: 115px;
  }

  .track-column.is-active .summary-img-btn {
    height: 135px;
  }

  .summary-section-preview {
    margin-top: -4px;
  }

  .summary-section-list {
    gap: 0 12px;
    font-size: 12px;
  }

  .summary-section-column {
    gap: 6px;
  }

  .track-column.is-final.is-active.has-sections .summary-img-btn {
    display: none;
  }

  .dialog-overlay {
    align-items: stretch;
    padding: 0;
  }

  .dialog-container {
    --dialog-main-rows: minmax(78px, 0.7fr) minmax(0, 6fr);
    --dialog-content-rows: minmax(0, 2.3fr) minmax(0, 3fr);
    --dialog-gallery-card-rows: minmax(0, 1.2fr) minmax(112px, 1fr);
    width: 100vw;
    height: 100vh;
    min-height: 0;
    max-height: 100vh;
    border-radius: 0;
  }

  .dialog-header {
    padding: 8px 58px 6px 14px;
  }

  .dialog-title {
    font-size: 27px;
    line-height: 1.14;
  }

  .dialog-main.is-section-detail .dialog-title {
    font-size: 23px;
  }

  .dialog-title-summary {
    max-height: 42px;
    margin-top: 6px;
    font-size: 15px;
    line-height: 1.45;
  }

  .dialog-header-aside {
    display: none;
  }

  .dialog-close {
    right: 14px;
    top: 12px;
  }

  .dialog-content {
    --dialog-nav-width: 46px;
    --dialog-gallery-gap: 10px;
    gap: 22px;
    padding: 4px 12px 12px;
  }

  .dialog-intro-panel-title {
    padding: 9px 12px 8px;
    font-size: 17px;
  }

  .dialog-intro-panel-body {
    padding: 10px 12px;
    font-size: 13px;
    line-height: 1.68;
  }

  .dialog-gallery-row {
    padding: 4px 0 0;
  }

  .dialog-gallery-shell {
    gap: var(--dialog-gallery-gap);
  }

  .anniversary-dialog-swiper .swiper-slide {
    width: 100%;
    max-height: none;
    transform: none;
  }

  .dialog-gallery-card {
    max-width: none;
  }

  .dialog-gallery-card-cover {
    padding: 10px 10px 0;
  }

  .dialog-gallery-card-copy {
    padding: 10px;
  }

  .dialog-gallery-card-body {
    font-size: 12px;
    line-height: 1.55;
  }

  .dialog-nav::after {
    font-size: 15px;
  }

  .dialog-image-preview {
    padding: 14px;
  }

  .dialog-image-preview-close {
    top: 14px;
    right: 14px;
  }

  .dialog-image-preview-download {
    top: 72px;
    right: 14px;
  }
}

@media (max-width: 575.98px) {
  .dialog-intro-row {
    width: 100%;
  }

  .dialog-gallery-shell {
    gap: 0;
  }

  .dialog-gallery-shell .dialog-nav {
    position: absolute;
    top: calc(26px + (100% - 112px) / 3);
    z-index: 4;
    width: 40px;
    height: 40px;
    margin: 0;
    transform: translateY(-50%);
  }

  .dialog-gallery-shell .dialog-nav-prev {
    right: auto;
    left: 26px;
  }

  .dialog-gallery-shell .dialog-nav-next {
    right: 26px;
    left: auto;
  }
}

@media (max-width: 1024px) {
  .dialog-structured-layout {
    grid-template-columns: minmax(148px, 0.28fr) minmax(0, 1fr);
    gap: 16px;
    padding: 6px 18px 18px;
  }

  /* 移动端隐藏目录，把空间全部留给正文和画廊 */
  .dialog-structure-nav {
    padding-right: 12px;
  }

  .dialog-structure-title {
    font-size: 19px;
  }

  .dialog-structure-kicker {
    font-size: 19px;
  }
}

@media (max-width: 640px) {
  .dialog-structured-layout {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 4px 12px 12px;
  }

  .dialog-structure-nav {
    display: none;
  }

  .dialog-structured-scroller {
    flex: 1 1 auto;
    height: 100%;
    padding: 0;
  }

  .dialog-structure-intro,
  .dialog-structure-section {
    padding-bottom: 16px;
  }

  .dialog-structure-parent-intro {
    margin-bottom: 0;
    padding: 4px 0 16px;
  }

  /* 移动端进一步压缩两个content面板的高度，减少首次进入时的滚动距离。 */
  .dialog-main.is-first-section-detail {
    --dialog-first-section-content-height: clamp(150px, 25vh, 230px);
  }

  .dialog-main.is-first-section-detail .dialog-structure-content-panel {
    padding: 10px 12px;
    font-size: 13px;
    line-height: 1.68;
  }

  .dialog-structure-kicker {
    font-size: 18px;
  }

  .dialog-structure-description {
    font-size: 13px;
    line-height: 1.68;
  }

  .dialog-structure-title {
    font-size: 18px;
  }

  .dialog-structure-level-2 {
    padding-left: 12px;
  }

  .dialog-structure-level-2 .dialog-structure-title {
    font-size: 16px;
  }

  .dialog-article-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    margin-top: 11px;
  }

  .dialog-article-item {
    min-height: 0;
    padding: 10px;
  }

  .dialog-article-body {
    max-height: 210px;
    font-size: 12px;
  }
}

@media (max-width: 640px) {
  .dialog-structured-gallery {
    height: 300px;
    padding: 0;
  }

  .dialog-structured-gallery .dialog-structured-nav {
    position: absolute;
    top: calc(26px + (100% - 112px) / 3);
    z-index: 3;
    width: 40px;
    height: 40px;
    margin: 0;
    transform: translateY(-50%);
  }

  .dialog-structured-gallery .dialog-structured-nav-prev {
    left: 12px;
  }

  .dialog-structured-gallery .dialog-structured-nav-next {
    right: 12px;
  }

  .dialog-structured-swiper .swiper-slide {
    width: 100%;
  }

  .dialog-structured-swiper.is-native-scroll .swiper-slide {
    flex-basis: 100%;
    width: 100%;
  }

  .dialog-structured-gallery .dialog-gallery-card {
    max-width: none;
  }
}

/* 手机端最后栏目改为单列完整展示，避免子栏目标题被截断。 */
@media (max-width: 575.98px) {
  .track-column.is-final.is-active.has-sections .summary-heading {
    display: block;
  }

  .track-column.is-final.is-active.has-sections .summary-description {
    margin-top: 6px;
    overflow: visible;
    text-overflow: clip;
    white-space: normal;
  }

  .track-column.is-final.is-active.has-sections .summary-img-btn {
    display: none;
  }

  .track-column.is-final.is-active.has-sections .summary-section-preview {
    margin-top: 12px;
  }

  .track-column.is-final.has-sections:not(.is-active) .summary-section-preview {
    margin-top: 12px;
  }

  .track-column.is-final.has-sections .summary-section-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    align-items: stretch;
  }

  .track-column.is-final.has-sections .summary-section-column {
    gap: 7px;
  }

  .track-column.is-final.has-sections .summary-section-column li,
  .track-column.is-final.has-sections .summary-section-btn {
    overflow: visible;
    text-overflow: clip;
    white-space: normal;
  }

  .track-column.is-final.has-sections .summary-section-column li {
    align-items: baseline;
  }

  .dialog-main.is-section-detail .dialog-title {
    width: 82%;
    max-width: 82%;
    font-size: 18px;
    line-height: 1.35;
    white-space: normal;
    overflow-wrap: anywhere;
    background-image: var(--anniversary-title-gradient);
    background-size: 100% 1lh;
    background-repeat: repeat-y;
    background-position: top left;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }
}

/* 手机横屏：短视口优先保证时间轴和卡片可读，沿用移动端纵向结构。 */
@media (orientation: landscape) and (max-width: 1024px) and (max-height: 600px) {
  body {
    --anniversary-hero-height: calc(100vw * 815 / 1930);
  }

  .anniversary-banner {
    height: var(--anniversary-hero-height);
    background-size: 100% auto;
  }

  .anniversary-timeline-section {
    min-height: calc(100vh - var(--anniversary-hero-height));
    background-color: #0c5a9a;
    background-image:
      url("https://www.cietac.org/sfs/anniversary70/hero-timeline-transition-mobile.png"),
      linear-gradient(180deg, rgba(32, 132, 205, 0.24), rgba(18, 95, 163, 0.18)),
      url("https://www.cietac.org/sfs/anniversary70/timeline-bg-mobile.png");
    background-position: top center, top center, top center;
    background-repeat: no-repeat, no-repeat, repeat-y;
    background-size: 100% auto, 100% 100%, 100% auto;
  }

  .demo-container {
    min-height: calc(100vh - var(--anniversary-hero-height));
    padding-top: 1px;
  }

  .timeline {
    --timeline-mobile-label-width: clamp(64px, 8vw, 76px);
    --timeline-mobile-dot-width: 30px;
    --timeline-mobile-column-gap: 8px;
    --timeline-mobile-axis-left: calc(
      var(--timeline-mobile-label-width) + var(--timeline-mobile-column-gap) +
        var(--timeline-mobile-dot-width) / 2
    );
    overflow-x: visible;
    padding: 4px clamp(12px, 3vw, 28px) 24px;
    overscroll-behavior-x: none;
  }

  .timeline-track {
    flex-direction: column;
    width: 100%;
    min-width: 0;
  }

  .timeline-track::before {
    top: 0;
    left: var(--timeline-mobile-axis-left);
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, transparent, #b8942e 3%, #d4a840 50%, #b8942e 97%, transparent);
  }

  .track-column,
  .track-column.is-active,
  .track-column.is-final.is-active {
    flex: none;
    width: 100%;
    display: grid;
    grid-template-columns: var(--timeline-mobile-label-width) var(--timeline-mobile-dot-width) minmax(0, 1fr);
    align-items: stretch;
    column-gap: var(--timeline-mobile-column-gap);
    transition: none;
  }

  .track-column + .track-column {
    margin-top: 10px;
  }

  .node {
    grid-column: 1;
    width: auto;
    min-height: 0;
    align-items: flex-end;
    padding: 12px 0;
  }

  .node-title {
    display: block;
    width: 100%;
    min-height: 0;
    font-size: clamp(13px, 1.8vw, 15px);
    line-height: 1.2;
    letter-spacing: 0.04em;
    text-align: right;
  }

  .node-title-desktop {
    display: none;
  }

  .node-title-mobile {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 5px;
    width: max-content;
    max-width: 100%;
    margin-left: auto;
  }

  .node-title-part {
    width: auto;
    text-align: right;
  }

  .node-dot {
    top: 22px;
    left: var(--timeline-mobile-axis-left);
  }

  .summary-item,
  .track-column:first-child .summary-item,
  .track-column:last-child .summary-item {
    grid-column: 3;
    width: 100%;
    min-width: 0;
    height: auto;
    min-height: 132px;
    margin-top: 0;
    border: 1px solid var(--anniversary-panel-border);
    border-radius: 10px;
  }

  .track-column + .track-column .summary-item {
    border-left: 1px solid var(--anniversary-panel-border);
  }

  .summary-copy {
    padding: 12px 14px 12px;
  }

  .summary-title {
    display: none;
    font-size: 15px;
    line-height: 1.35;
  }

  .track-column.is-active .summary-title {
    font-size: 18px;
  }

  .summary-description {
    background-image: var(--anniversary-title-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    color: #f4c985;
    -webkit-text-fill-color: transparent;
    font-size: 14px;
    line-height: 1.45;
  }

  .track-column.is-active .summary-description {
    color: #ffe28a;
    font-size: 16px;
  }

  .summary-img-btn,
  .track-column.is-active .summary-img-btn {
    margin-top: 6px;
    height: 88px;
  }

  .track-column.is-active .summary-img-btn {
    height: 110px;
  }

  .track-column.is-final.is-active.has-sections .summary-img-btn {
    display: none;
  }

  .track-column.is-final.is-active.has-sections .summary-heading {
    display: block;
  }

  .track-column.is-final.is-active.has-sections .summary-description {
    margin-top: 6px;
    overflow: visible;
    text-overflow: clip;
    white-space: normal;
  }

  .track-column.is-final.has-sections .summary-section-preview {
    margin-top: 10px;
  }

  .track-column.is-final.has-sections .summary-section-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    align-items: stretch;
  }

  .track-column.is-final.has-sections .summary-section-column {
    gap: 6px;
  }

  .track-column.is-final.has-sections .summary-section-column li,
  .track-column.is-final.has-sections .summary-section-btn {
    overflow: visible;
    text-overflow: clip;
    white-space: normal;
  }

  .track-column.is-final.has-sections .summary-section-column li {
    align-items: baseline;
  }

  .summary-section-column {
    font-size: 12px;
    line-height: 1.4;
  }

  .dialog-overlay {
    align-items: stretch;
    padding: 8px;
  }

  .dialog-container {
    --dialog-main-rows: minmax(58px, 0.7fr) minmax(0, 5fr);
    --dialog-content-rows: minmax(0, 1fr) minmax(0, 1.1fr);
    --dialog-gallery-card-rows: minmax(0, 1.15fr) minmax(64px, 0.85fr);
    width: calc(100vw - 16px);
    height: calc(100vh - 16px);
    min-height: 0;
    max-height: calc(100vh - 16px);
    border-radius: 10px;
  }

  .dialog-header {
    gap: 10px;
    padding: 10px 64px 6px 18px;
  }

  .dialog-title {
    max-width: 100%;
    font-size: 26px;
    line-height: 1.1;
    white-space: nowrap;
  }

  .dialog-main.is-section-detail .dialog-title {
    max-width: 88%;
    font-size: 23px;
    line-height: 1.2;
    white-space: normal;
    background-image: var(--anniversary-title-gradient);
    background-size: 100% 1lh;
    background-repeat: repeat-y;
    background-position: top left;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .dialog-title-summary {
    max-height: 38px;
    margin-top: 4px;
    font-size: 14px;
    line-height: 1.4;
  }

  .dialog-header-aside {
    display: none;
  }

  .dialog-close {
    top: 10px;
    right: 14px;
  }

  .dialog-content {
    --dialog-nav-width: 36px;
    --dialog-gallery-gap: 8px;
    gap: 10px;
    padding: 4px 14px 10px;
  }

  .dialog-intro-panel-title {
    padding: 7px 12px 6px;
    font-size: 16px;
  }

  .dialog-intro-panel-body {
    padding: 8px 12px;
    font-size: 12px;
    line-height: 1.5;
  }

  .dialog-gallery-row {
    padding: 0;
  }

  .dialog-gallery-shell {
    gap: var(--dialog-gallery-gap);
  }

  .anniversary-dialog-swiper .swiper-slide {
    width: min(300px, 100%);
  }

  .dialog-gallery-card {
    max-width: 300px;
  }

  .dialog-gallery-card-cover {
    padding: 8px 8px 0;
  }

  .dialog-gallery-card-copy {
    padding: 8px 10px 10px;
  }

  .dialog-gallery-card-body {
    font-size: 12px;
    line-height: 1.5;
  }

  .dialog-nav {
    width: 36px;
    height: 36px;
  }

  .dialog-nav::after {
    font-size: 14px;
  }

  .dialog-structured-layout {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 4px 14px 10px;
  }

  .dialog-structure-nav {
    display: none;
  }

  .dialog-structured-scroller {
    flex: 1 1 auto;
    height: 100%;
    padding: 0;
  }

  .dialog-structure-intro,
  .dialog-structure-section {
    padding-bottom: 14px;
  }

  .dialog-structure-kicker {
    font-size: 16px;
  }

  .dialog-structure-description {
    font-size: 12px;
    line-height: 1.5;
  }

  .dialog-structure-title {
    font-size: 17px;
  }

  .dialog-structure-level-2 {
    padding: 10px 10px 12px 12px;
  }

  .dialog-structure-level-2 .dialog-structure-title {
    font-size: 15px;
  }

  .dialog-structured-gallery {
    height: 232px;
    margin-top: 10px;
  }

  .dialog-structured-gallery .dialog-structured-nav {
    width: 36px;
    height: 36px;
  }

  .dialog-structured-gallery .dialog-structured-nav-prev {
    left: 8px;
  }

  .dialog-structured-gallery .dialog-structured-nav-next {
    right: 8px;
  }

  .dialog-article-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    margin-top: 10px;
  }

  .dialog-article-item {
    min-height: 0;
    padding: 9px;
  }

  .dialog-article-body {
    max-height: 160px;
    font-size: 12px;
  }

  .dialog-image-preview {
    padding: 10px;
  }

  .dialog-image-preview-close {
    top: 10px;
    right: 10px;
  }

  .dialog-image-preview-download {
    top: 64px;
    right: 10px;
  }
}

/* 英文详情界面标题字体 */
/*html.is-english .dialog-title {*/
/*  font-size: clamp(20px, 3vw, 42px);*/
/*}*/

/*html.is-english .dialog-main.is-section-detail .dialog-title {*/
/*  font-size: clamp(18px, 2.4vw, 32px);*/
/*}*/

/* 时间轴最后一个栏目的英文详情界面标题字体 */
html.is-english .dialog-main.is-final-milestone .dialog-title {
  /*max-width: 88%;*/
  font-size: clamp(16px, 1.8vw, 28px);
  line-height: 1.1;
  white-space: normal;
  overflow-wrap: anywhere;
}

/* 英文移动端最后栏目详情页增加标题区高度，避免长标题挤出弹框头部。 */
@media (max-width: 640px) {
  html.is-english .dialog-main.is-final-milestone {
    --dialog-main-rows: minmax(170px, 1.3fr) minmax(0, 5fr);
  }

  html.is-english .dialog-main.is-final-milestone .dialog-title {
    /*max-width: 84%;*/
    /*font-size: 23px;*/
    font-size: clamp(18px, 1.8vw, 28px);
    line-height: 1.2;
    letter-spacing: 0.02em;
  }
}