.page-about {
  --about-gap: clamp(20px, 3.2vw, 36px);
  --about-radius: var(--radius-panel);
  padding-bottom: clamp(48px, 8vw, 104px);
  overflow-x: hidden;
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .crumbs a {
  color: var(--steel-bright);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--cyan);
}

.page-about .layout-rail {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  padding-top: clamp(10px, 2vw, 20px);
}

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

/* 左侧章节轨道 */
.page-about .rail {
  min-width: 0;
}

.page-about .rail-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
  margin: 0 0 10px;
}

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

.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 10px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-dark);
  color: var(--steel-bright);
  text-decoration: none;
  font-size: 13px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .rail-link .mono {
  color: var(--steel);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--paper-hi);
  border-color: var(--line-cyan);
  outline: none;
}

.page-about .rail-link[aria-current="true"] {
  color: var(--paper-hi);
  border-color: var(--cyan);
  background: rgba(53, 242, 208, 0.09);
}

.page-about .rail-link[aria-current="true"] .mono {
  color: var(--cyan);
}

.page-about .rail-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* 通用章节头 */
.page-about .about-sec-head {
  max-width: 52ch;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .kicker .mono {
  color: var(--orange);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  color: var(--paper-hi);
}

.page-about .about-sec-lede {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.75;
  color: var(--steel-bright);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(14px, 2.4vw, 28px) 0 clamp(30px, 5vw, 54px);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: end;
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about h1.display {
  font-family: var(--font-display);
  font-size: clamp(38px, 8vw, 84px);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper-hi);
  margin: 0 0 16px;
}

.page-about .h1-accent {
  color: var(--orange);
}

.page-about .lede {
  margin: 0 0 20px;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--steel-bright);
}

.page-about .about-quick {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 14px;
}

.page-about .about-quick li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--steel);
  border-left: 2px solid var(--line-cyan);
  padding-left: 10px;
}

.page-about .about-quick .mono {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-media {
  margin: 0;
  border-radius: var(--radius-panel);
  overflow: hidden;
  border: 1px solid var(--line-dark);
  background: var(--ink-800);
}

.page-about .about-hero-media img,
.page-about .about-flow-media img,
.page-about .about-tl-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero-media figcaption,
.page-about .about-flow-media figcaption,
.page-about .about-tl-media figcaption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--steel);
  background: var(--ink-800);
}

/* 奶油纸面板 */
.page-about .about-panel {
  background: var(--paper);
  color: var(--ink-body);
  border-radius: var(--about-radius);
  padding: clamp(20px, 3.4vw, 46px);
  box-shadow: 0 18px 40px -30px rgba(0, 0, 0, 0.75);
}

.page-about .about-panel .about-h2 {
  color: var(--ink-body);
}

.page-about .about-panel .about-sec-lede {
  color: var(--ink-body-soft);
}

.page-about .about-panel .kicker {
  color: var(--alert);
}

.page-about .about-panel .kicker .mono {
  color: var(--alert);
}

/* 团队 */
.page-about .about-team {
  padding: clamp(30px, 5vw, 56px) 0;
}

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

.page-about .team-node {
  position: relative;
  min-width: 0;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--paper-hi);
  border: 1px solid var(--line-paper);
  border-radius: var(--radius-soft);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .team-node:hover,
.page-about .team-node:focus,
.page-about .team-node:focus-within {
  transform: translateY(-3px);
  border-color: rgba(200, 65, 26, 0.45);
  box-shadow: 0 14px 26px -22px rgba(26, 23, 20, 0.85);
  outline: none;
}

.page-about .team-node:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .team-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--alert);
  letter-spacing: -0.02em;
}

.page-about .team-unit {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-body-soft);
  margin-left: 4px;
}

.page-about .team-title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-body);
}

.page-about .team-desc {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-body-soft);
}

.page-about .team-extra {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(26, 23, 20, 0.2);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-body);
}

/* 流程 */
.page-about .about-flow {
  padding: clamp(30px, 5vw, 56px) 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .flow-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .flow-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .flow-track::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 242, 208, 0.06));
}

.page-about .flow-step {
  position: relative;
  padding: 0 0 24px 44px;
}

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

.page-about .flow-dot {
  position: absolute;
  left: 5px;
  top: 4px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink-900);
}

.page-about .flow-time {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .flow-step h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 700;
  color: var(--paper-hi);
  letter-spacing: 0.01em;
}

.page-about .flow-step p:not(.flow-time) {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel-bright);
}

.page-about .about-flow-media {
  margin: 0;
  border-radius: var(--radius-panel);
  overflow: hidden;
  border: 1px solid var(--line-dark);
  background: var(--ink-800);
}

/* 时间轴 */
.page-about .about-timeline {
  padding: clamp(30px, 5vw, 56px) 0;
}

.page-about .timeline-scale {
  display: block;
  width: 100%;
  height: auto;
  max-height: 56px;
  color: var(--orange);
  margin: 0 0 clamp(18px, 3vw, 28px);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .tl-node {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--alert);
}

.page-about .tl-card {
  position: relative;
  min-width: 0;
  padding: 14px 18px 16px 18px;
  border-left: 2px solid rgba(26, 23, 20, 0.22);
  background: rgba(255, 249, 239, 0.55);
  border-radius: 0 var(--radius-soft) var(--radius-soft) 0;
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .tl-card::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--alert);
  transition: background-color 200ms var(--ease);
}

.page-about .tl-node:hover .tl-card,
.page-about .tl-node:focus-within .tl-card {
  border-left-color: var(--orange);
  background: var(--paper-hi);
  transform: translateX(2px);
}

.page-about .tl-node:hover .tl-card::before,
.page-about .tl-node:focus-within .tl-card::before {
  background: var(--orange);
}

.page-about .tl-card h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 700;
  color: var(--ink-body);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-body-soft);
}

.page-about .tl-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--alert);
}

.page-about .about-tl-media {
  margin: clamp(22px, 3vw, 32px) 0 0;
  border-radius: var(--radius-soft);
  overflow: hidden;
  border: 1px solid var(--line-paper);
  background: var(--paper-hi);
}

.page-about .about-tl-media figcaption {
  background: var(--paper-hi);
  color: var(--ink-body-soft);
}

/* 合作与成绩 */
.page-about .about-eco {
  padding: clamp(30px, 5vw, 56px) 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .eco-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .eco-stat {
  min-width: 0;
  padding: 16px 14px;
  background: var(--ink-800);
  border-top: 2px solid var(--line-cyan);
  border-radius: 0 0 var(--radius-soft) var(--radius-soft);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .eco-stat:hover {
  transform: translateY(-3px);
  border-top-color: var(--cyan);
}

.page-about .eco-stat--hot {
  border-top-color: var(--orange);
}

.page-about .eco-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .eco-stat--hot .eco-num {
  color: var(--orange);
}

.page-about .eco-unit {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--steel);
  margin-left: 2px;
}

.page-about .eco-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel-bright);
}

.page-about .eco-notes {
  display: grid;
  gap: 10px;
}

.page-about .eco-notes p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

/* 原则 */
.page-about .about-principles {
  padding: clamp(30px, 5vw, 56px) 0 0;
}

.page-about .principle-list {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 36px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .principle {
  min-width: 0;
  padding: 16px 0 14px;
  border-top: 2px solid rgba(26, 23, 20, 0.16);
}

.page-about .p-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--alert);
  margin-bottom: 8px;
}

.page-about .principle h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  color: var(--ink-body);
  letter-spacing: 0.01em;
}

.page-about .principle p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-body-soft);
}

.page-about .about-cta {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink-900);
  border-radius: var(--radius-soft);
}

.page-about .about-cta-text {
  margin: 0 0 14px;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel-bright);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.page-about .about-cta .btn:focus-visible,
.page-about .about-hero-actions .btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

@media (min-width: 640px) {
  .page-about .about-quick {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .eco-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .principle-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }
}

@media (min-width: 760px) {
  .page-about .team-map {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .team-node--a {
    grid-column: span 7;
  }

  .page-about .team-node--b {
    grid-column: span 5;
  }

  .page-about .team-node--c {
    grid-column: span 5;
  }

  .page-about .team-node--d {
    grid-column: span 7;
  }
}

@media (min-width: 900px) {
  .page-about .layout-rail {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 48px);
    align-items: start;
  }

  .page-about .rail {
    position: sticky;
    top: 96px;
    padding-top: 6px;
  }

  .page-about .rail-list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
  }

  .page-about .rail-link {
    width: 100%;
    border-radius: 0;
    border: 0;
    border-left: 2px solid var(--line-dark);
    padding: 10px 0 10px 14px;
    font-size: 14px;
    background: transparent;
  }

  .page-about .rail-link[aria-current="true"] {
    background: transparent;
    border-left-color: var(--cyan);
    color: var(--paper-hi);
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .flow-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.68fr);
    gap: clamp(24px, 3.6vw, 46px);
  }

  .page-about .about-flow-media {
    position: sticky;
    top: 96px;
  }

  .page-about .tl-node {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .tl-year {
    text-align: right;
    padding-top: 18px;
    font-size: 14px;
  }

  .page-about .eco-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-principles-panel {
    padding-right: clamp(28px, 4vw, 56px);
  }

  .page-about .principle:nth-child(even) {
    padding-top: 26px;
  }

  .page-about .principle:nth-child(odd) {
    padding-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-node,
  .page-about .eco-stat,
  .page-about .tl-card,
  .page-about .rail-link {
    transition: none;
  }

  .page-about .team-node:hover,
  .page-about .team-node:focus,
  .page-about .team-node:focus-within,
  .page-about .eco-stat:hover,
  .page-about .tl-node:hover .tl-card,
  .page-about .tl-node:focus-within .tl-card {
    transform: none;
  }
}