.page-about {
  --about-railw: 244px;
  --about-shadow: 0 18px 40px rgba(20, 17, 13, 0.08);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  padding-bottom: 24px;
}

.page-about .container {
  width: 100%;
}

.page-about .breadcrumb {
  margin: 16px 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .breadcrumb a {
  color: var(--night);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--track);
}

.page-about .index-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--moss);
  display: block;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding: 10px 0 44px;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-hero__text h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 6.4vw, 4rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--ink);
  max-width: 15em;
}

.page-about .about-hero__lead {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  line-height: 1.8;
  color: var(--seed);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--r-xl);
  box-shadow: var(--about-shadow);
}

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

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
    gap: clamp(24px, 4vw, 52px);
    padding: 18px 0 56px;
  }
}

/* ---------- 档案骨架 ---------- */

.page-about .about-shell {
  display: grid;
  gap: 30px;
  padding: 34px 0 40px;
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-railw) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 68px);
    align-items: start;
    padding-top: 46px;
  }

  .page-about .about-rail {
    border-bottom: 0;
    border-right: 1px solid var(--line-strong);
    padding: 0 22px 0 0;
  }

  .page-about .about-rail__sticky {
    position: sticky;
    top: calc(var(--bar) + 20px);
  }
}

.page-about .about-rail {
  border-bottom: 1px solid var(--line);
  padding-bottom: 18px;
}

.page-about .about-axis {
  display: block;
  width: 100%;
  max-width: 190px;
  height: auto;
  margin: 8px 0 20px;
}

.page-about .ax-line {
  stroke: var(--line-strong);
  stroke-width: 1.5;
  stroke-dasharray: 4 7;
  fill: none;
}

.page-about .ax-node rect {
  fill: var(--paper-2);
  stroke: var(--line-strong);
  stroke-width: 1.5;
}

.page-about .ax-node text {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  fill: var(--ink);
}

.page-about .ax-node--now rect {
  fill: var(--kiwi);
  stroke: var(--night);
}

.page-about .ax-node--now text {
  fill: var(--night);
}

.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--moss);
  text-decoration: none;
  font-size: 0.85rem;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .toc__link:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}

.page-about .toc__link.is-current {
  background: var(--night);
  border-color: var(--night);
  color: var(--arena);
}

.page-about .toc__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  opacity: 0.85;
}

@media (min-width: 1000px) {
  .page-about .about-toc {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .toc__link {
    width: 100%;
    border-radius: var(--r-sm);
    padding: 7px 10px;
  }
}

.page-about .about-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--night);
  color: var(--arena);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-top:hover {
  background: var(--seed);
  transform: translateY(-2px);
}

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

/* ---------- 章节 ---------- */

.page-about .about-sec {
  margin: 0 0 46px;
  padding: 0;
}

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

.page-about .about-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  border-top: 1px solid var(--line-strong);
  padding-top: 18px;
  margin-bottom: 16px;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-weight: 200;
  font-size: clamp(2.2rem, 7vw, 4.2rem);
  line-height: 0.78;
  letter-spacing: -0.05em;
  color: rgba(20, 17, 13, 0.16);
  transform: skewX(-6deg);
  transform-origin: left bottom;
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 3vw, 2rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  max-width: 20em;
  color: var(--ink);
}

.page-about .about-sec__lead {
  margin: 0 0 22px;
  max-width: 38em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--seed);
}

.page-about .about-sec p {
  margin: 0 0 14px;
  max-width: 40em;
}

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

@media (min-width: 700px) {
  .page-about .about-cols {
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  }

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

.page-about .about-cols__item {
  background: var(--arena);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 18px 20px;
}

.page-about .about-cols__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--night);
}

.page-about .about-cols__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--seed);
  max-width: none;
}

.page-about .about-cols__item--dark {
  background: var(--night);
  border-color: var(--night);
  color: var(--arena);
}

.page-about .about-cols__item--dark h3 {
  color: var(--kiwi);
}

.page-about .about-cols__item--dark p {
  color: rgba(255, 253, 248, 0.86);
}

/* ---------- 数据条 ---------- */

.page-about .about-data {
  margin: 0 0 22px;
  border-top: 1px dashed var(--line-strong);
}

.page-about .data-row {
  display: grid;
  gap: 6px 20px;
  padding: 15px 0;
  border-bottom: 1px dashed var(--line-strong);
}

.page-about .data-row__fig {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-mono);
}

.page-about .data-row__fig::before {
  content: "";
  display: block;
  width: 18px;
  height: 3px;
  background: var(--track);
  flex: 0 0 auto;
  align-self: center;
}

.page-about .data-row__num {
  font-size: clamp(1.6rem, 4.4vw, 2.3rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .data-row__unit {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--moss);
}

.page-about .data-row__note {
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--seed);
}

@media (min-width: 640px) {
  .page-about .data-row {
    grid-template-columns: minmax(130px, 160px) 1fr;
    align-items: baseline;
  }
}

/* ---------- 赛区节点图 ---------- */

.page-about .zone-wrap {
  background: var(--night);
  border-radius: var(--r-xl);
  padding: 20px clamp(16px, 3vw, 28px) 18px;
  color: var(--arena);
}

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

.page-about .zm-lines path {
  fill: none;
  stroke: rgba(255, 253, 248, 0.32);
  stroke-width: 1.5;
  stroke-dasharray: 3 7;
}

.page-about .zm-node circle {
  fill: var(--kiwi);
}

.page-about .zm-node--alt circle {
  fill: var(--track);
}

.page-about .zm-label text {
  fill: rgba(255, 253, 248, 0.78);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-anchor: middle;
}

.page-about .zone-cap {
  margin: 12px 0 0;
  max-width: none;
  font-size: 0.82rem;
  line-height: 1.7;
  color: rgba(255, 253, 248, 0.74);
}

/* ---------- 双栏 ---------- */

.page-about .about-split {
  display: grid;
  gap: 20px;
}

.page-about .about-split__media {
  margin: 0;
  border-radius: var(--r-lg);
  box-shadow: var(--about-shadow);
}

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

@media (min-width: 840px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

/* ---------- 展开说明 ---------- */

.page-about .about-more {
  margin-top: 18px;
  background: var(--arena);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  padding: 0 18px;
}

.page-about .about-more summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--night);
}

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

.page-about .about-more summary::before {
  content: "";
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  background: var(--kiwi);
  border-radius: 2px;
  transform: rotate(45deg);
  transition: background 0.2s var(--ease);
}

.page-about .about-more[open] summary::before {
  background: var(--track);
}

.page-about .about-more ul {
  margin: 0 0 16px;
  padding-left: 18px;
}

.page-about .about-more li {
  margin-bottom: 8px;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--seed);
}

.page-about .about-more strong {
  color: var(--ink);
}

/* ---------- 版本列表 ---------- */

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

.page-about .ver-step {
  display: grid;
  gap: 8px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: var(--paper-2);
  border-left: 4px solid var(--line-strong);
}

.page-about .ver-step__badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--rust);
}

.page-about .ver-step__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ver-step__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--seed);
  max-width: none;
}

.page-about .ver-step--now {
  background: var(--night);
  border-left-color: var(--kiwi);
}

.page-about .ver-step--now .ver-step__badge {
  color: var(--kiwi);
}

.page-about .ver-step--now .ver-step__body h3 {
  color: var(--arena);
}

.page-about .ver-step--now .ver-step__body p {
  color: rgba(255, 253, 248, 0.84);
}

@media (min-width: 560px) {
  .page-about .ver-step {
    grid-template-columns: 62px minmax(0, 1fr);
    align-items: start;
    gap: 14px;
  }

  .page-about .ver-step__badge {
    padding-top: 3px;
  }
}

/* ---------- 承接链接段 ---------- */

.page-about .about-follow {
  margin: 20px 0 0;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(182, 240, 52, 0.16);
  border-left: 4px solid var(--kiwi);
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--seed);
  max-width: none;
}

.page-about .about-follow a {
  color: var(--night);
  text-decoration: none;
  border-bottom: 1.5px solid var(--track);
  padding-bottom: 1px;
}

.page-about .about-follow a:hover {
  color: var(--rust);
  border-bottom-color: var(--rust);
}

/* ---------- 联系通道 ---------- */

.page-about .about-routes {
  display: grid;
  gap: 14px;
  margin-bottom: 8px;
}

@media (min-width: 780px) {
  .page-about .about-routes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-route {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px 16px;
  border-radius: var(--r-lg);
  background: var(--arena);
  border: 1px solid var(--line-strong);
}

.page-about .about-route .index-label {
  margin: 0;
}

.page-about .about-route h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--night);
}

.page-about .about-route p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--seed);
  max-width: none;
  flex: 1 1 auto;
}

.page-about .about-route__link {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--night);
  text-decoration: none;
  border-bottom: 1.5px solid var(--track);
  padding-bottom: 2px;
}

.page-about .about-route__link:hover {
  color: var(--rust);
}

.page-about .about-route--accent {
  background: var(--seed);
  border-color: var(--seed);
}

.page-about .about-route--accent .index-label {
  color: var(--kiwi);
}

.page-about .about-route--accent h3 {
  color: var(--arena);
}

.page-about .about-route--accent p {
  color: rgba(255, 253, 248, 0.84);
}

.page-about .about-route--accent .about-route__link {
  color: var(--kiwi);
  border-bottom-color: var(--kiwi);
}

.page-about .copy-chips {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
}

@media (min-width: 640px) {
  .page-about .copy-chips {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .copy-chip {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 13px 16px;
  border-radius: var(--r-md);
  background: var(--paper-2);
  border: 1px dashed var(--line-strong);
  text-align: left;
  cursor: pointer;
  font-family: var(--font-body);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
  min-width: 0;
}

.page-about .copy-chip:hover {
  border-color: var(--night);
}

.page-about .copy-chip__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .copy-chip__value {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-about .copy-chip__hint {
  font-size: 0.74rem;
  color: var(--moss);
}

.page-about .copy-chip.is-copied {
  border-color: var(--kiwi);
  background: rgba(182, 240, 52, 0.22);
}

.page-about .about-address {
  margin: 16px 0 0;
  font-size: 0.88rem;
  color: var(--moss);
  max-width: none;
}

@media (min-width: 1000px) {
  .page-about .about-sec {
    margin-bottom: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-top,
  .page-about .toc__link,
  .page-about .copy-chip,
  .page-about .about-more summary::before {
    transition: none;
  }
}