/* ===== 城市档案 page-about ===== */

.page-about {
  padding-bottom: 88px;
}

/* —— 首屏框景 —— */
.page-about .about-hero {
  position: relative;
  margin: 10px 0 34px;
  padding: 30px 18px 32px;
  overflow: hidden;
  color: var(--paper);
  background:
    radial-gradient(130% 120% at 92% -10%, rgba(232, 122, 46, 0.38) 0%, rgba(232, 122, 46, 0) 60%),
    linear-gradient(158deg, var(--indigo) 0%, var(--indigo-2) 56%, var(--mist) 100%);
  box-shadow: inset 0 0 0 1px rgba(244, 239, 230, 0.18);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 16px;
  right: 12px;
  bottom: 16px;
  width: 10px;
  background: repeating-linear-gradient(to bottom, rgba(244, 239, 230, 0.42) 0 1px, transparent 1px 13px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 34px;
  bottom: 0;
  left: 18px;
  height: 3px;
  background: linear-gradient(90deg, var(--orange) 0%, var(--brick) 46%, rgba(244, 239, 230, 0) 100%);
}

.page-about .about-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange-soft);
}

.page-about .about-hero h1 {
  max-width: 16em;
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(27px, 7vw, 52px);
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 36em;
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  color: rgba(244, 239, 230, 0.86);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 14px 18px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid rgba(244, 239, 230, 0.22);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--orange-soft);
}

.page-about .about-hero__label {
  font-family: var(--font-heading);
  font-size: 12px;
  line-height: 1.5;
  color: rgba(244, 239, 230, 0.78);
}

/* —— 主体双栏 —— */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-about .about-flow {
  min-width: 0;
}

/* —— 阶段目录（移动端横条 / 桌面右侧刻度） —— */
.page-about .about-rail {
  order: -1;
  margin: 0 0 26px;
  padding: 0 0 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  list-style: none;
}

.page-about .about-rail__list a {
  display: inline-flex;
  gap: 6px;
  align-items: baseline;
  padding: 7px 12px;
  font-family: var(--font-heading);
  font-size: 13px;
  line-height: 1.4;
  color: var(--indigo);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--line);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus {
  color: var(--brick);
  border-color: var(--orange);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

/* —— 章节 —— */
.page-about .about-chapter {
  padding: 32px 0 30px;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:first-child {
  padding-top: 4px;
  border-top: 0;
}

.page-about .about-chapter__year {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--brick);
  background: rgba(185, 78, 59, 0.06);
  border: 1px solid rgba(185, 78, 59, 0.42);
}

.page-about .about-chapter h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 4.6vw, 31px);
  font-weight: 600;
  line-height: 1.36;
  color: var(--ink);
}

.page-about .about-chapter p {
  margin: 0 0 1em;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
}

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

.page-about .about-lead {
  max-width: 34em;
  margin-top: 14px;
  color: var(--mist);
}

/* —— 起点 —— */
.page-about .about-origin {
  display: grid;
  gap: 22px;
  margin-top: 20px;
}

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--sand);
  box-shadow: 0 22px 46px -36px rgba(10, 16, 32, 0.62);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 10px;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.72;
  color: var(--steel);
  border-left: 2px solid var(--orange);
}

.page-about .about-figure--spread {
  margin-top: 26px;
}

/* —— 六维框架 —— */
.page-about .about-dim {
  display: grid;
  gap: 22px;
  margin-top: 22px;
  padding: 20px 16px;
  background: linear-gradient(155deg, rgba(216, 203, 184, 0.7) 0%, rgba(244, 239, 230, 0.94) 72%);
  box-shadow: inset 0 0 0 1px rgba(16, 27, 51, 0.12);
}

.page-about .about-dim__graph {
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-hex {
  display: block;
  width: 100%;
  max-width: 232px;
  height: auto;
}

.page-about .about-hex polygon {
  fill: none;
  stroke: rgba(45, 79, 108, 0.38);
  stroke-width: 1;
}

.page-about .about-hex line {
  stroke: rgba(45, 79, 108, 0.2);
  stroke-width: 1;
}

.page-about .about-hex .about-hex__core {
  fill: var(--indigo);
  stroke: none;
}

.page-about .about-hex .about-hex__nodes circle {
  fill: var(--orange);
  stroke: none;
}

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

.page-about .about-dim__item {
  padding-top: 12px;
  border-top: 1px solid rgba(16, 27, 51, 0.16);
}

.page-about .about-dim__item h3 {
  display: flex;
  gap: 8px;
  align-items: baseline;
  margin: 0 0 5px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--indigo);
}

.page-about .about-dim__no {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-dim__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
}

/* —— 时间轴 —— */
.page-about .about-time {
  margin: 24px 0 0;
  padding: 0 0 0 20px;
  list-style: none;
  border-left: 2px solid rgba(16, 27, 51, 0.14);
}

.page-about .about-time__item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .about-time__item:last-child {
  padding-bottom: 0;
}

.page-about .about-time__item::before {
  content: "";
  position: absolute;
  top: 9px;
  left: -25px;
  width: 8px;
  height: 8px;
  background: var(--paper);
  border: 2px solid var(--steel);
  border-radius: 50%;
}

.page-about .about-time__item--now::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(232, 122, 46, 0.18);
}

.page-about .about-time__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--indigo);
}

.page-about .about-time__item--now .about-time__year {
  color: var(--brick);
}

.page-about .about-time__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--indigo);
}

.page-about .about-time__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* —— 记录者 —— */
.page-about .about-chapter .about-team {
  margin-top: 20px;
  padding: 22px 16px;
  color: var(--paper);
  background: linear-gradient(152deg, var(--indigo) 0%, var(--indigo-2) 62%, #233c5c 100%);
  box-shadow: inset 0 0 0 1px rgba(244, 239, 230, 0.14);
}

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

.page-about .about-team__total {
  font-family: var(--font-mono);
  font-size: 44px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--orange-soft);
}

.page-about .about-team__unit {
  font-family: var(--font-heading);
  font-size: 15px;
  color: rgba(244, 239, 230, 0.86);
}

.page-about .about-team p {
  margin: 14px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 239, 230, 0.8);
}

.page-about .about-team__bar {
  display: flex;
  height: 14px;
  margin: 22px 0 14px;
  box-shadow: inset 0 0 0 1px rgba(244, 239, 230, 0.2);
}

.page-about .about-team__seg {
  min-width: 0;
}

.page-about .about-team__seg--a { flex: 18 1 0; background: var(--orange); }
.page-about .about-team__seg--b { flex: 12 1 0; background: var(--orange-soft); }
.page-about .about-team__seg--c { flex: 9 1 0; background: var(--mist); }
.page-about .about-team__seg--d { flex: 7 1 0; background: var(--sand); }

.page-about .about-team__legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-heading);
  font-size: 13px;
  color: rgba(244, 239, 230, 0.82);
}

.page-about .about-team__legend li {
  display: flex;
  gap: 7px;
  align-items: center;
}

.page-about .about-team__dot {
  width: 8px;
  height: 8px;
  flex: 0 0 8px;
}

.page-about .about-team__dot--a { background: var(--orange); }
.page-about .about-team__dot--b { background: var(--orange-soft); }
.page-about .about-team__dot--c { background: var(--mist); }
.page-about .about-team__dot--d { background: var(--sand); }

.page-about .about-team__num {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange-soft);
}

.page-about .about-team__steps {
  margin: 22px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid rgba(244, 239, 230, 0.18);
}

.page-about .about-team__steps li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 10px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.84);
}

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

.page-about .about-team__step-no {
  flex: 0 0 22px;
  width: 22px;
  height: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 22px;
  text-align: center;
  color: var(--indigo);
  background: var(--orange-soft);
}

.page-about .about-network {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px dashed rgba(16, 27, 51, 0.2);
}

.page-about .about-network h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--indigo);
}

.page-about .about-network__cities {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-network__cities li {
  padding: 5px 11px;
  font-family: var(--font-heading);
  font-size: 13px;
  color: var(--mist);
  border: 1px solid rgba(45, 79, 108, 0.32);
}

/* —— 合作 —— */
.page-about .about-partners__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-top: 12px;
  border-top: 2px solid var(--sand);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--brick);
}

.page-about .about-stat__label {
  font-family: var(--font-heading);
  font-size: 13px;
  line-height: 1.55;
  color: var(--steel);
}

.page-about .about-partners__cols {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

.page-about .about-volumes__spines {
  display: flex;
  gap: 6px;
  align-items: flex-end;
  height: 92px;
  margin-bottom: 14px;
}

.page-about .about-volumes__spines span {
  flex: 1 1 0;
  height: 100%;
  background: linear-gradient(180deg, var(--brick) 0%, #8f3a2c 100%);
  box-shadow: inset 1px 0 0 rgba(244, 239, 230, 0.25);
}

.page-about .about-volumes__spines span:nth-child(2) { height: 88%; }
.page-about .about-volumes__spines span:nth-child(3) { height: 96%; }
.page-about .about-volumes__spines span:nth-child(4) { height: 82%; }
.page-about .about-volumes__spines span:nth-child(5) { height: 92%; }
.page-about .about-volumes__spines span:nth-child(6) { height: 86%; }
.page-about .about-volumes__spines span:nth-child(7) { height: 100%; }
.page-about .about-volumes__spines span:nth-child(8) { height: 90%; }

.page-about .about-volumes__cap {
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

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

/* —— 出口 —— */
.page-about .about-chapter--next {
  padding-bottom: 8px;
}

.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  box-shadow: inset 0 0 0 1px var(--line);
}

.page-about .about-next a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 18px;
  gap: 4px 12px;
  padding: 16px 16px 16px 18px;
  text-decoration: none;
  background: var(--paper);
  border-left: 3px solid transparent;
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-next a:hover,
.page-about .about-next a:focus {
  background: #fbf8f2;
  border-left-color: var(--orange);
}

.page-about .about-next__kicker {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--brick);
}

.page-about .about-next__title {
  grid-column: 1;
  font-family: var(--font-heading);
  font-size: 15px;
  line-height: 1.55;
  color: var(--indigo);
}

.page-about .about-next__arrow {
  grid-row: 1 / span 2;
  grid-column: 2;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--orange);
}

/* —— 平板 —— */
@media (min-width: 620px) {
  .page-about .about-dim__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
  }

  .page-about .about-dim {
    padding: 24px 22px;
  }

  .page-about .about-partners__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team__legend {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-hero {
    padding: 44px 40px 42px;
  }

  .page-about .about-hero::before {
    right: 16px;
    width: 14px;
  }

  .page-about .about-hero h1 {
    margin-top: 18px;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 30px;
  }

  .page-about .about-time__item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 6px 20px;
    align-items: baseline;
  }

  .page-about .about-time__year {
    font-size: 32px;
    margin-bottom: 0;
  }

  .page-about .about-team {
    padding: 28px 26px;
  }

  .page-about .about-partners__cols {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 30px;
  }
}

/* —— 桌面：右侧阶段刻度 + 内容长卷 —— */
@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) 164px;
    column-gap: 48px;
  }

  .page-about .about-rail {
    order: 0;
    position: sticky;
    top: calc(var(--bar-h) + 32px);
    margin: 0;
    padding: 4px 0 0 16px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-rail__list li + li {
    border-top: 1px solid rgba(16, 27, 51, 0.08);
  }

  .page-about .about-rail__list a {
    padding: 10px 0;
    border: 0;
    font-size: 13px;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus {
    border: 0;
    color: var(--brick);
  }

  .page-about .about-chapter {
    padding: 42px 0 38px;
  }

  .page-about .about-dim {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 34px;
    padding: 30px 28px;
    align-items: start;
  }

  .page-about .about-team {
    padding: 34px 32px;
  }

  .page-about .about-team__total {
    font-size: 52px;
  }
}
<<<END>>>