.page-about {
  --track-x: 10px;
  --chapter-pad: 38px;
  background: var(--paper);
  color: var(--ink);
}

@media (min-width: 641px) {
  .page-about {
    --track-x: 18px;
    --chapter-pad: 56px;
  }
}

/* ---------- 匾额色带 ---------- */
.page-about .about-plaque {
  position: relative;
  padding: 20px 0 40px;
  background: var(--cinnabar);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-plaque::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(135deg, rgba(245, 239, 227, 0.06) 0 1px, transparent 1px 16px);
  pointer-events: none;
}

.page-about .about-plaque::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold-light) 42%, rgba(201, 162, 39, 0.18) 100%);
}

.page-about .about-plaque .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin-bottom: 24px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
}

.page-about .breadcrumb-item {
  color: rgba(245, 239, 227, 0.62);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(233, 206, 134, 0.62);
}

.page-about .breadcrumb-link {
  color: rgba(245, 239, 227, 0.9);
  text-decoration: none;
  border-bottom: 1px solid rgba(233, 206, 134, 0.42);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--gold-light);
}

.page-about .plaque-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold-light);
}

.page-about .plaque-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.2vw, 66px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .plaque-lead {
  margin: 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 239, 227, 0.87);
}

.page-about .plaque-stats {
  display: flex;
  flex-wrap: wrap;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(233, 206, 134, 0.32);
}

.page-about .plaque-stat {
  flex: 1 1 128px;
  padding: 16px 16px 0 0;
  border-right: 1px solid rgba(233, 206, 134, 0.22);
}

.page-about .plaque-stat:last-child {
  border-right: 0;
  padding-right: 0;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--gold-light);
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(245, 239, 227, 0.66);
}

/* ---------- 首屏通栏图 ---------- */
.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  line-height: 0;
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: 200px;
  object-fit: cover;
  object-position: center 58%;
}

@media (min-width: 760px) {
  .page-about .about-hero-figure img {
    height: 300px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-figure img {
    height: 380px;
  }
}

.page-about .about-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(11, 29, 35, 0.62) 0%, rgba(11, 29, 35, 0.08) 46%, rgba(181, 52, 43, 0.24) 100%),
    linear-gradient(180deg, rgba(11, 29, 35, 0.34) 0%, transparent 42%, rgba(11, 29, 35, 0.46) 100%);
  pointer-events: none;
}

.page-about .about-hero-figure .media-caption {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 14px;
  z-index: 1;
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: rgba(245, 239, 227, 0.82);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 32px;
  padding: 40px 0 0;
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) 172px;
    gap: 52px;
    padding-top: 60px;
  }
}

/* ---------- 竖排时间线 ---------- */
.page-about .about-flow {
  position: relative;
  padding-left: var(--chapter-pad);
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: calc(var(--track-x) - 0.5px);
  width: 1px;
  background: var(--line-gold);
}

.page-about .about-chapter {
  position: relative;
  margin: 0 0 44px;
}

.page-about .about-chapter:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: 32px;
  left: calc(var(--track-x) - var(--chapter-pad) - 4.5px);
  width: 9px;
  height: 9px;
  background: var(--gold);
  z-index: 1;
}

.page-about .chapter-card {
  position: relative;
  padding: 26px 18px;
  background: var(--paper-card);
  border: 1px solid var(--line-ink-soft);
  max-width: 100%;
}

@media (min-width: 760px) {
  .page-about .chapter-card {
    padding: 36px 38px;
  }
}

@media (min-width: 900px) {
  .page-about .chapter-card--w1 { max-width: 70%; }
  .page-about .chapter-card--w2 { max-width: 78%; }
  .page-about .chapter-card--w3 { max-width: 86%; }
  .page-about .chapter-card--w4 { max-width: 93%; }
  .page-about .chapter-card--w5 { max-width: 100%; }
  .page-about .chapter-card--w6 { max-width: 100%; }
}

.page-about .chapter-num {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cinnabar);
}

.page-about .chapter-title {
  position: relative;
  margin: 0 0 22px;
  padding-bottom: 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.2vw, 31px);
  line-height: 1.34;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .chapter-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 48px;
  height: 2px;
  background: var(--cinnabar);
}

.page-about .chapter-lead {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .chapter-card p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(22, 50, 58, 0.9);
}

.page-about .chapter-card p:last-child {
  margin-bottom: 0;
}

/* ---------- 阶段折叠列表 ---------- */
.page-about .stage-list {
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stage-item {
  border-top: 1px solid var(--line-ink-soft);
}

.page-about .stage-item:last-child {
  border-bottom: 1px solid var(--line-ink-soft);
}

.page-about .stage-summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 0;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
}

.page-about .stage-summary::-webkit-details-marker {
  display: none;
}

.page-about .stage-summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--gold);
}

.page-about .stage-details[open] .stage-summary::after {
  content: "–";
}

.page-about .stage-summary:hover .stage-name {
  color: var(--cinnabar);
}

.page-about .stage-year {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cinnabar);
}

.page-about .stage-name {
  font-weight: 700;
  color: var(--ink);
}

.page-about .stage-body {
  padding: 0 0 18px;
}

.page-about .stage-body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(22, 50, 58, 0.88);
}

.page-about .stage-result {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

/* ---------- 团队 ---------- */
.page-about .team-area {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

@media (min-width: 860px) {
  .page-about .team-area {
    grid-template-columns: 260px minmax(0, 1fr);
    align-items: start;
    gap: 28px;
  }
}

.page-about .team-figure {
  position: relative;
  margin: 0;
  line-height: 0;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
  object-position: center;
}

@media (min-width: 860px) {
  .page-about .team-figure img {
    height: 100%;
    min-height: 300px;
  }
}

.page-about .team-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(11, 29, 35, 0.26);
  pointer-events: none;
}

.page-about .team-grid {
  display: grid;
  gap: 12px;
}

.page-about .team-card {
  display: grid;
  gap: 8px;
  padding: 20px 20px 20px 18px;
  background: var(--paper-card);
  border: 1px solid var(--line-ink-soft);
  border-left: 3px solid var(--gold);
}

@media (min-width: 620px) {
  .page-about .team-card {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }
}

.page-about .team-head {
  display: grid;
  gap: 6px;
}

.page-about .team-name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

.page-about .team-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(22, 50, 58, 0.88);
}

.page-about .team-card--key {
  background: var(--cinnabar-deep);
  border-color: var(--cinnabar-deep);
  border-left-color: var(--gold);
}

.page-about .team-card--key .team-name {
  color: var(--paper);
}

.page-about .team-card--key .team-meta {
  color: rgba(233, 206, 134, 0.86);
}

.page-about .team-card--key .team-desc {
  color: rgba(245, 239, 227, 0.86);
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

@media (min-width: 780px) {
  .page-about .coverage {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
    gap: 30px;
  }
}

.page-about .coverage-map {
  padding: 10px;
  background: rgba(22, 50, 58, 0.035);
  border: 1px solid var(--line-ink-soft);
}

.page-about .coverage-map svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .fx-outline {
  fill: rgba(22, 50, 58, 0.05);
  stroke: rgba(22, 50, 58, 0.24);
  stroke-width: 1;
}

.page-about .fx-pin {
  fill: var(--cinnabar);
}

.page-about .fx-pin--key {
  fill: var(--celadon);
}

.page-about .fx-label {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: rgba(22, 50, 58, 0.78);
  letter-spacing: 0.02em;
}

.page-about .fx-label--key {
  fill: var(--celadon);
  font-weight: 700;
}

.page-about .coverage-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .coverage-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line-ink-soft);
  font-size: 14px;
  color: var(--ink);
}

.page-about .cov-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
}

.page-about .scenario-list {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .scenario-item {
  display: grid;
  gap: 4px;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
}

.page-about .scenario-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .scenario-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(22, 50, 58, 0.82);
}

/* ---------- 复核做法 ---------- */
.page-about .review-grid {
  display: grid;
  margin-top: 22px;
}

.page-about .review-item {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--line-ink-soft);
}

.page-about .review-item:last-child {
  border-bottom: 1px solid var(--line-ink-soft);
}

@media (min-width: 620px) {
  .page-about .review-item {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

.page-about .review-key {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cinnabar);
}

.page-about .review-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(22, 50, 58, 0.9);
}

/* ---------- 导览图物料 ---------- */
.page-about .kit-figure {
  margin: 22px 0 24px;
  position: relative;
  line-height: 0;
}

.page-about .kit-figure img {
  display: block;
  width: 100%;
  height: 180px;
  object-fit: cover;
  object-position: center 62%;
}

@media (min-width: 760px) {
  .page-about .kit-figure img {
    height: 240px;
  }
}

.page-about .kit-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-ink-soft);
}

.page-about .kit-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .kit-filter {
  appearance: none;
  border: 1px solid var(--line-ink);
  background: transparent;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 7px 14px;
  border-radius: 0;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .kit-filter:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.page-about .kit-filter[aria-pressed="true"] {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--paper);
}

.page-about .kit-count {
  margin: 0 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .kit-grid {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

@media (min-width: 760px) {
  .page-about .kit-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .kit-card {
  padding: 22px 20px;
  background: var(--paper-card);
  border: 1px solid var(--line-ink-soft);
  border-top: 3px solid var(--gold);
}

.page-about .kit-card[hidden] {
  display: none;
}

.page-about .kit-format {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cinnabar);
}

.page-about .kit-name {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .kit-desc {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(22, 50, 58, 0.88);
}

.page-about .kit-use {
  margin: 0 0 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .kit-link {
  display: inline-block;
  font-size: 13px;
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid rgba(181, 52, 43, 0.42);
  padding-bottom: 2px;
}

.page-about .kit-link:hover {
  color: var(--cinnabar-deep);
  border-bottom-color: var(--cinnabar-deep);
}

.page-about .kit-empty {
  margin: 18px 0 0;
  font-size: 14px;
  color: var(--stone);
}

/* ---------- 右侧章节索引 ---------- */
.page-about .chapter-rail {
  display: none;
}

@media (min-width: 1024px) {
  .page-about .chapter-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-left: 16px;
    border-left: 1px solid var(--line-gold);
  }
}

.page-about .rail-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--stone);
}

.page-about .rail-list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 0;
  font-size: 13px;
  line-height: 1.4;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--cinnabar);
  border-bottom-color: var(--line-gold);
}

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  margin-top: 44px;
  padding: 34px 0 64px;
  border-top: 1px solid var(--line-gold);
}

.page-about .next-kicker {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--cinnabar);
}

.page-about .next-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1.35;
  color: var(--ink);
}

.page-about .next-grid {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

@media (min-width: 620px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .next-card {
  display: grid;
  gap: 7px;
  padding: 18px 16px;
  background: var(--paper-card);
  border: 1px solid var(--line-ink-soft);
  text-decoration: none;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cinnabar);
}

.page-about .next-num {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .next-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .next-desc {
  font-size: 13px;
  line-height: 1.75;
  color: rgba(22, 50, 58, 0.78);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .kit-filter,
  .page-about .rail-link,
  .page-about .next-card {
    transition-duration: 0.01ms;
  }

  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}
<<<END>>>