.page-about {
  --about-side: 200px;
  --about-cut: 18px;
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  padding: calc(var(--header-h) + 44px) 0 38px;
  background:
    radial-gradient(130% 100% at 100% 0%, rgba(192, 138, 62, .16), transparent 58%),
    var(--paper);
}

.page-about .about-hero .crumbs {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 22px;
}

.page-about .about-hero .crumbs a {
  color: var(--copper-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(138, 90, 34, .35);
}

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

.page-about .about-hero-grid {
  display: grid;
  gap: 30px;
}

.page-about .about-eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--copper-deep);
}

.page-about .about-eyebrow::after {
  content: "";
  flex: 0 1 96px;
  height: 7px;
  background: repeating-linear-gradient(115deg, var(--clay) 0 2px, transparent 2px 9px);
}

.page-about h1 {
  margin: 0 0 22px;
  font-size: clamp(31px, 5.6vw, 56px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -.022em;
  color: var(--ink-green);
  max-width: 14em;
}

.page-about .about-lede {
  margin: 0;
  max-width: 650px;
  font-size: clamp(15.5px, 1.6vw, 17.5px);
  line-height: 1.92;
  color: #2f3a34;
}

.page-about .about-facts {
  position: relative;
  padding: 26px 24px 22px;
  background: var(--ink-green);
  color: var(--paper);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-facts::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 58%;
  background: linear-gradient(180deg, var(--copper-bright), rgba(227, 184, 114, 0));
}

.page-about .about-facts-item + .about-facts-item {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(227, 184, 114, .24);
}

.page-about .about-facts-k {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--copper-bright);
}

.page-about .about-facts-v {
  margin: 7px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(246, 242, 233, .84);
}

@media (min-width: 980px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, .72fr);
    gap: 58px;
    align-items: end;
  }
}

/* ============ 横向节奏带 ============ */
.page-about .about-band {
  padding: 20px 0;
  background: var(--ink-green-deep);
  color: var(--paper);
}

.page-about .about-band-inner {
  display: grid;
  gap: 14px;
}

.page-about .about-band-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
}

.page-about .about-band-item .mono {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--copper-bright);
}

.page-about .about-band-item span:last-child {
  color: rgba(246, 242, 233, .8);
}

@media (min-width: 800px) {
  .page-about .about-band-inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 34px;
  }
}

/* ============ 主体骨架 ============ */
.page-about .about-shell {
  display: grid;
  gap: 0;
  padding: 10px 0 72px;
}

@media (min-width: 1040px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-side) minmax(0, 1fr);
    gap: 56px;
    padding-top: 22px;
  }
}

/* ---- 左侧章节栏 ---- */
.page-about .about-side {
  padding: 18px 0 4px;
  border-bottom: 1px solid rgba(27, 31, 28, .1);
}

.page-about .about-side-title {
  display: none;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .24em;
  color: var(--muted);
}

.page-about .about-side-nav {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: none;
}

.page-about .about-side-nav::-webkit-scrollbar {
  display: none;
}

.page-about .about-side-link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  flex: 0 0 auto;
  padding: 9px 14px;
  font-size: 13.5px;
  color: #2c332e;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid rgba(27, 31, 28, .14);
  background: rgba(246, 242, 233, .6);
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-side-num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--copper-deep);
}

.page-about .about-side-link:hover,
.page-about .about-side-link:focus-visible {
  color: var(--ink-green);
  border-color: var(--copper);
  background: var(--paper-2);
}

@media (min-width: 1040px) {
  .page-about .about-side {
    border-bottom: 0;
    padding: 0;
  }

  .page-about .about-side-inner {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }

  .page-about .about-side-title {
    display: block;
  }

  .page-about .about-side-nav {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-side-link {
    display: flex;
    white-space: normal;
    padding: 11px 0 11px 14px;
    border: 0;
    border-left: 2px solid rgba(27, 31, 28, .13);
    background: none;
    line-height: 1.5;
  }

  .page-about .about-side-link:hover,
  .page-about .about-side-link:focus-visible {
    border-left-color: var(--copper);
    color: var(--copper-deep);
    background: none;
  }
}

/* ============ 章节 ============ */
.page-about .about-chapter {
  position: relative;
  padding: 38px 0 46px;
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid rgba(27, 31, 28, .1);
}

.page-about .about-chapter + .about-chapter::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 78px;
  height: 4px;
  background: repeating-linear-gradient(115deg, var(--copper) 0 2px, transparent 2px 8px);
}

.page-about .about-idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--copper-deep);
}

.page-about .about-chapter h2 {
  margin: 10px 0 12px;
  font-size: clamp(22px, 3.2vw, 33px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -.012em;
  color: var(--ink-green);
  max-width: 20em;
}

.page-about .about-chapter-lede {
  margin: 0 0 26px;
  max-width: 620px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---- 正文与配图 ---- */
.page-about .about-split {
  display: grid;
  gap: 26px;
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 42px;
    align-items: start;
  }
}

.page-about .about-text {
  font-size: 16px;
  line-height: 1.9;
  color: #2c332e;
  max-width: 660px;
}

.page-about .about-text p {
  margin: 0 0 16px;
}

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

.page-about .about-text--after {
  margin-top: 26px;
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.93) contrast(1.03);
}

.page-about .about-figure--wide {
  margin: 0 0 28px;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  border-left: 2px solid var(--paper-2);
  padding-left: 10px;
}

/* ============ 时间线 ============ */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 28px 20px 24px 20px;
  list-style: none;
  background: var(--ink-green);
  color: var(--paper);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 34px;
  bottom: 36px;
  width: 2px;
  background: linear-gradient(180deg, var(--copper-bright), var(--clay) 54%, var(--electric));
  transform: skewX(-7deg);
  opacity: .8;
}

.page-about .about-node {
  position: relative;
  padding: 16px 0 16px 26px;
  display: grid;
  gap: 4px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--copper-bright);
  transform: rotate(45deg);
}

.page-about .about-node + .about-node {
  border-top: 1px solid rgba(227, 184, 114, .18);
}

.page-about .about-node-time {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--copper-bright);
}

.page-about .about-node-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.62;
  color: var(--paper);
}

.page-about .about-node-note {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(246, 242, 233, .72);
  transition: color .25s var(--ease), transform .25s var(--ease);
}

@media (min-width: 760px) {
  .page-about .about-timeline {
    padding: 32px 28px 28px;
  }

  .page-about .about-node {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 26px;
    padding-left: 30px;
  }

  .page-about .about-node-time {
    padding-top: 3px;
  }
}

@media (min-width: 900px) {
  .page-about .about-node:hover .about-node-note,
  .page-about .about-node:focus-within .about-node-note {
    color: rgba(246, 242, 233, .95);
    transform: translateX(4px);
  }
}

/* ============ 团队点阵 ============ */
.page-about .about-split--reverse {
  margin-bottom: 30px;
}

.page-about .about-map-wrap {
  padding: 22px 20px 18px;
  background: var(--paper-2);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

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

.page-about .about-map circle {
  fill: rgba(22, 52, 44, .3);
}

.page-about .about-map circle.is-hub {
  fill: var(--copper);
}

.page-about .about-map-note {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 上岗门槛 ============ */
.page-about .about-gates {
  display: grid;
  gap: 18px;
}

@media (min-width: 820px) {
  .page-about .about-gates {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

.page-about .about-gate {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--paper-2);
  border-left: 3px solid var(--clay);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .about-gate-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--copper-deep);
}

.page-about .about-gate h3 {
  margin: 9px 0 8px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.5;
  color: var(--ink-green);
}

.page-about .about-gate p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: #3a423c;
}

/* ============ 数据条 ============ */
.page-about .about-stats {
  display: grid;
  gap: 16px;
}

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .about-stat {
  padding: 22px 18px 20px;
  background: var(--paper-2);
  border-top: 3px solid var(--copper);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .about-stat .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(23px, 2.8vw, 30px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--copper-deep);
}

.page-about .about-stat .stat-label {
  display: block;
  margin-top: 9px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ============ 演进 ============ */
.page-about .about-road {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 820px) {
  .page-about .about-road {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    align-items: start;
  }

  .page-about .about-road-item:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-road-item:nth-child(3) {
    margin-top: 52px;
  }
}

.page-about .about-road-item {
  position: relative;
  padding: 20px 18px 18px;
  background: var(--paper-2);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.page-about .about-road-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--paper);
  background: var(--ink-green);
  padding: 3px 10px;
}

.page-about .about-road-item h3 {
  margin: 12px 0 8px;
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.5;
  color: var(--ink-green);
}

.page-about .about-road-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: #3a423c;
}

/* ============ 继续了解 ============ */
.page-about .about-next {
  margin-top: 12px;
  padding: 30px 0 0;
  border-top: 1px solid rgba(27, 31, 28, .1);
}

.page-about .about-next-title {
  margin: 0 0 18px;
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink-green);
}

.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next-links .btn {
  flex: 0 1 auto;
}

@media (max-width: 520px) {
  .page-about .about-next-links .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}