.page-about {
  --about-rule: rgba(15, 15, 13, 0.14);
  --about-rule-light: rgba(242, 233, 216, 0.16);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .prose {
  font-family: var(--font-body);
  font-size: var(--step-base);
  line-height: 1.85;
  color: var(--ink);
  max-width: 34em;
  margin: 0;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.16em;
  color: var(--ash);
  margin: 0;
  text-transform: uppercase;
}

.page-about .sec {
  padding-block: clamp(52px, 8vw, 104px);
}

.page-about .sec--paper {
  background: var(--paper);
}

.page-about .sec--dark {
  background: var(--night);
  color: var(--paper);
  position: relative;
}

.page-about .sec--dark .eyebrow {
  color: var(--lime);
}

.page-about .sec--dark .prose {
  color: rgba(242, 233, 216, 0.84);
}

.page-about .sec-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.8vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  max-width: 19em;
  color: var(--ink);
}

.page-about .sec-title--light {
  color: var(--paper);
}

.page-about .sec-lede {
  font-family: var(--font-body);
  font-size: var(--step-base);
  line-height: 1.85;
  color: var(--ash);
  max-width: 40em;
  margin: clamp(16px, 2.5vw, 26px) 0 0;
}

.page-about .sec--dark .sec-lede {
  color: rgba(242, 233, 216, 0.76);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 30px);
  padding-bottom: clamp(12px, 2vw, 20px);
  background: var(--paper);
}

.page-about .breadcrumbs {
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.06em;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--ash);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb-list a {
  color: var(--ash);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--mid);
  border-bottom-color: var(--mid);
}

.page-about .breadcrumb-list [aria-current="page"] {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(40px, 7vw, 92px) clamp(44px, 7vw, 88px);
  background:
    radial-gradient(110% 88% at 88% 0%, rgba(79, 195, 161, 0.18), transparent 62%),
    radial-gradient(90% 70% at 4% 100%, rgba(255, 122, 47, 0.14), transparent 66%),
    linear-gradient(170deg, var(--night) 0%, var(--mid) 100%);
  color: var(--paper);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(242, 233, 216, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 233, 216, 0.055) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 2;
}

.page-about .about-hero .eyebrow {
  color: var(--lime);
}

.page-about .about-h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8.2vw, 82px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 15em;
  color: var(--paper);
}

.page-about .about-lede {
  font-family: var(--font-body);
  font-size: var(--step-base);
  line-height: 1.85;
  margin: clamp(20px, 3vw, 34px) 0 0;
  max-width: 34em;
  color: rgba(242, 233, 216, 0.82);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(34px, 5.5vw, 58px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--about-rule-light);
}

.page-about .fig {
  position: relative;
  padding-left: 14px;
}

.page-about .fig::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: var(--line);
}

.page-about .fig:first-child::before {
  background: var(--lime);
}

.page-about .fig-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .fig-label {
  display: block;
  margin-top: 10px;
  font-size: var(--step-sm);
  color: rgba(242, 233, 216, 0.72);
}

.page-about .pitch-lines {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -40px;
  width: 100%;
  height: clamp(140px, 22vw, 280px);
  z-index: 1;
  opacity: 0.14;
  pointer-events: none;
}

.page-about .pitch-lines circle,
.page-about .pitch-lines line,
.page-about .pitch-lines path,
.page-about .pitch-lines rect {
  fill: none;
  stroke: var(--jade);
  stroke-width: 1.4;
}

/* ---------- 服务对象 ---------- */
.page-about .who-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(30px, 4.5vw, 52px);
}

.page-about .who-item {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--paper-2);
  border-left: 3px solid var(--line);
  border-radius: 0 0 var(--cut) 0;
}

.page-about .who-item:nth-child(1) {
  border-left-color: var(--orange);
}

.page-about .who-item:nth-child(2) {
  border-left-color: var(--jade);
}

.page-about .who-item:nth-child(3) {
  border-left-color: var(--sand);
}

.page-about .who-item:nth-child(4) {
  border-left-color: var(--mid);
}

.page-about .who-h {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-lg);
  line-height: 1.4;
  margin: 0 0 12px;
  color: var(--ink);
}

.page-about .who-item .prose {
  font-size: var(--step-sm);
  line-height: 1.9;
  color: #2c2c28;
}

.page-about .who-foot {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-rule);
  font-size: var(--step-sm);
  letter-spacing: 0.08em;
  color: var(--ash);
}

/* ---------- 四城编辑室 ---------- */
.page-about .city-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 26px);
  margin: clamp(30px, 4.5vw, 50px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .city-card {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--mid);
  border: 1px solid var(--line);
  border-radius: 0 0 var(--cut) 0;
  overflow: hidden;
}

.page-about .city-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 3px;
  background: var(--cc, var(--lime));
}

.page-about .city-card--bj {
  --cc: var(--orange);
}

.page-about .city-card--sh {
  --cc: var(--lime);
}

.page-about .city-card--cd {
  --cc: var(--jade);
}

.page-about .city-card--gz {
  --cc: var(--sand);
}

.page-about .city-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--step-xs);
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border: 1px solid currentColor;
  border-radius: 0 0 6px 0;
}

.page-about .city-tag--bj {
  color: var(--orange);
}

.page-about .city-tag--sh {
  color: var(--lime);
}

.page-about .city-tag--cd {
  color: var(--jade);
}

.page-about .city-tag--gz {
  color: var(--sand);
}

.page-about .city-h {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-lg);
  line-height: 1.4;
  margin: 16px 0 12px;
  color: var(--paper);
}

.page-about .city-p {
  font-family: var(--font-body);
  font-size: var(--step-sm);
  line-height: 1.9;
  margin: 0;
  color: rgba(242, 233, 216, 0.78);
}

.page-about .room-note {
  font-family: var(--font-body);
  font-size: var(--step-base);
  line-height: 1.85;
  margin: clamp(28px, 4vw, 44px) 0 0;
  max-width: 40em;
  padding-left: 20px;
  border-left: 3px solid var(--lime);
  color: rgba(242, 233, 216, 0.86);
}

/* ---------- 流程 ---------- */
.page-about .flow-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4.5vw, 48px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .flow-copy .prose {
  margin-bottom: clamp(22px, 3vw, 32px);
}

.page-about .flow-acc {
  border-top: 1px solid var(--about-rule);
}

.page-about .flow-item {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .flow-sum {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 2px;
  cursor: pointer;
  list-style: none;
}

.page-about .flow-sum::-webkit-details-marker {
  display: none;
}

.page-about .flow-sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--step-lg);
  line-height: 1;
  color: var(--ash);
}

.page-about .flow-item[open] .flow-sum::after {
  content: "−";
  color: var(--mid);
}

.page-about .flow-no {
  font-size: var(--step-xs);
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .flow-t {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-lg);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .flow-body {
  padding: 0 2px 22px 46px;
}

.page-about .flow-body p {
  font-family: var(--font-body);
  font-size: var(--step-sm);
  line-height: 1.9;
  margin: 0;
  max-width: 34em;
  color: #2c2c28;
}

.page-about .flow-link {
  font-family: var(--font-body);
  font-size: var(--step-sm);
  line-height: 1.9;
  margin: clamp(22px, 3vw, 30px) 0 0;
  color: var(--ash);
}

.page-about .flow-link a {
  color: var(--mid);
  text-decoration: none;
  border-bottom: 2px solid var(--lime);
  padding-bottom: 1px;
}

.page-about .flow-link a:hover,
.page-about .flow-link a:focus-visible {
  background: var(--lime);
  color: var(--night);
}

.page-about .flow-figure {
  margin: 0;
  border-radius: 0 0 var(--cut) 0;
  overflow: hidden;
  background: var(--paper-2);
}

.page-about .flow-figure figcaption,
.page-about .team-figure figcaption,
.page-about .trace-banner figcaption {
  font-size: var(--step-xs);
  letter-spacing: 0.08em;
  padding: 12px 16px;
  color: var(--ash);
  background: var(--paper-2);
}

.page-about .sec--dark .trace-banner figcaption {
  background: var(--mid);
  color: rgba(242, 233, 216, 0.7);
}

/* ---------- 发展历程 ---------- */
.page-about .trace-banner {
  margin: clamp(26px, 4vw, 42px) 0 0;
  border-radius: 0 0 var(--cut) 0;
  overflow: hidden;
  background: var(--mid);
}

.page-about .trace-seg {
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .segmented-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  position: relative;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-rule-light);
}

.page-about .segmented-btn {
  appearance: none;
  background: transparent;
  border: 0;
  padding: 8px 12px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: var(--step-sm);
  letter-spacing: 0.06em;
  color: rgba(242, 233, 216, 0.62);
  border-radius: 0 0 6px 0;
  transition: color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .segmented-btn:hover {
  color: var(--paper);
  background: rgba(201, 242, 39, 0.08);
}

.page-about .segmented-btn[aria-selected="true"] {
  color: var(--lime);
}

.page-about .segmented-btn:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .segmented-indicator {
  position: absolute;
  bottom: -1px;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--lime);
  transform: skewX(-24deg);
  transition: transform 200ms var(--ease), width 200ms var(--ease);
  pointer-events: none;
}

.page-about .sec--paper .segmented-bar {
  border-bottom-color: var(--about-rule);
}

.page-about .sec--paper .segmented-btn {
  color: var(--ash);
}

.page-about .sec--paper .segmented-btn:hover {
  color: var(--mid);
  background: rgba(18, 58, 44, 0.06);
}

.page-about .sec--paper .segmented-btn[aria-selected="true"] {
  color: var(--mid);
}

.page-about .sec--paper .segmented-indicator {
  background: var(--mid);
}

.page-about .tl-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  padding-top: clamp(24px, 3.5vw, 38px);
}

.page-about .tl-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-left: 14px;
  border-left: 3px solid var(--jade);
}

.page-about .tl-year {
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--jade);
}

.page-about .tl-ver {
  font-size: var(--step-xs);
  letter-spacing: 0.1em;
  color: var(--ash);
}

.page-about .tl-body h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.2vw, 28px);
  line-height: 1.35;
  margin: 0 0 14px;
  color: var(--paper);
}

.page-about .tl-body p {
  font-family: var(--font-body);
  font-size: var(--step-base);
  line-height: 1.85;
  margin: 0;
  max-width: 34em;
  color: rgba(242, 233, 216, 0.82);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4.5vw, 48px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .team-seg .segmented-bar {
  border-bottom-color: var(--about-rule);
}

.page-about .role-panel {
  padding-top: clamp(22px, 3vw, 32px);
}

.page-about .role-count {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 10px;
}

.page-about .role-num {
  font-size: clamp(38px, 7vw, 62px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--mid);
}

.page-about .role-unit {
  font-family: var(--font-body);
  font-size: var(--step-sm);
  color: var(--ash);
}

.page-about .role-panel h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-xl);
  line-height: 1.35;
  margin: 0 0 14px;
  color: var(--ink);
}

.page-about .role-panel p {
  font-family: var(--font-body);
  font-size: var(--step-base);
  line-height: 1.85;
  margin: 0;
  max-width: 34em;
  color: #2c2c28;
}

.page-about .team-figure {
  margin: 0;
  border-radius: 0 0 var(--cut) 0;
  overflow: hidden;
  background: var(--paper-2);
}

/* ---------- 协作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 26px);
  margin-top: clamp(30px, 4.5vw, 50px);
}

.page-about .eco-item {
  position: relative;
  padding: 26px 22px 26px 26px;
  background: var(--mid);
  border-radius: 0 0 var(--cut) 0;
  border-left: 3px solid var(--lime);
}

.page-about .eco-item:nth-child(2) {
  border-left-color: var(--jade);
}

.page-about .eco-item:nth-child(3) {
  border-left-color: var(--sand);
}

.page-about .eco-item:nth-child(4) {
  border-left-color: var(--orange);
}

.page-about .eco-n {
  display: block;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .eco-h {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-lg);
  line-height: 1.4;
  margin: 14px 0 10px;
  color: var(--lime);
}

.page-about .eco-item:nth-child(2) .eco-h {
  color: var(--jade);
}

.page-about .eco-item:nth-child(3) .eco-h {
  color: var(--sand);
}

.page-about .eco-item:nth-child(4) .eco-h {
  color: var(--orange);
}

.page-about .eco-p {
  font-family: var(--font-body);
  font-size: var(--step-sm);
  line-height: 1.9;
  margin: 0;
  color: rgba(242, 233, 216, 0.78);
}

.page-about .eco-foot {
  font-family: var(--font-body);
  font-size: var(--step-base);
  line-height: 1.85;
  margin: clamp(28px, 4vw, 44px) 0 0;
  max-width: 40em;
  color: rgba(242, 233, 216, 0.84);
}

.page-about .eco-foot a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 2px solid rgba(201, 242, 39, 0.5);
}

.page-about .eco-foot a:hover,
.page-about .eco-foot a:focus-visible {
  background: var(--lime);
  color: var(--night);
  border-bottom-color: var(--lime);
}

/* ---------- 合作入口 ---------- */
.page-about .cta-sec {
  background:
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
}

.page-about .cta-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
  align-items: start;
}

.page-about .cta-copy .sec-title {
  max-width: 20em;
}

.page-about .cta-copy .prose {
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .cta-line {
  font-family: var(--font-mono);
  font-size: var(--step-sm);
  letter-spacing: 0.04em;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--about-rule);
  color: var(--mid);
}

.page-about .cta-note {
  font-family: var(--font-body);
  font-size: var(--step-sm);
  line-height: 1.8;
  margin: 10px 0 0;
  color: var(--ash);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .btn {
  display: inline-block;
  padding: 14px 26px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-base);
  text-decoration: none;
  border-radius: 0 0 var(--cut) 0;
  transition: transform 200ms var(--ease), background 200ms var(--ease), color 200ms var(--ease);
}

.page-about .btn--lime {
  background: var(--lime);
  color: var(--night);
}

.page-about .btn--ink {
  background: var(--night);
  color: var(--paper);
  border: 1px solid var(--mid);
}

.page-about .btn:hover,
.page-about .btn:focus-visible {
  transform: translateY(-2px);
}

.page-about .btn--lime:hover,
.page-about .btn--lime:focus-visible {
  background: var(--jade);
  color: var(--night);
}

.page-about .btn--ink:hover,
.page-about .btn--ink:focus-visible {
  background: var(--mid);
  color: var(--lime);
}

.page-about .btn:focus-visible {
  outline: 2px solid var(--mid);
  outline-offset: 3px;
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  display: block;
}

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

.page-about .media-frame--16x9 img {
  aspect-ratio: 16 / 9;
}

.page-about .media-frame--4x3 img {
  aspect-ratio: 4 / 3;
}

.page-about .media-frame--21x9 img {
  aspect-ratio: 21 / 9;
}

/* ---------- 渐进增强 ---------- */
.page-about .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}

.page-about .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .who-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(22px, 3vw, 34px);
  }

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

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

  .page-about .tl-panel {
    grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .tl-body {
    padding-left: 4px;
  }

  .page-about .cta-wrap {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1000px) {
  .page-about .flow-layout {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .flow-figure .media-frame--4x3 img,
  .page-about .team-figure .media-frame--4x3 img {
    aspect-ratio: 3 / 4;
  }

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

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .btn:hover,
  .page-about .btn:focus-visible {
    transform: none;
  }

  .page-about .segmented-indicator {
    transition: none;
  }
}