.page-about {
  background: var(--paper);
  color: var(--ink);
  padding-bottom: 56px;
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .crumbs a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--milan-red);
}

.page-about .crumbs a:hover {
  color: var(--milan-red);
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding-top: 12px;
}

/* ---------- 左侧目录 ---------- */

.page-about .about-rail {
  border-top: var(--bw) solid var(--ink);
  padding-top: 12px;
}

.page-about .about-rail__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--milan-red);
  transform: rotate(-2deg);
  transform-origin: left bottom;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-rail__list li {
  flex: 0 0 auto;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 2px solid var(--ink);
  border-radius: var(--r-pill);
  background: var(--paper-white);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  background: var(--milan-red);
  border-color: var(--milan-red);
  color: var(--paper-white);
}

.page-about .about-rail__list .mono {
  font-size: 11px;
  color: var(--milan-red);
}

.page-about .about-rail__list a:hover .mono,
.page-about .about-rail__list a:focus-visible .mono {
  color: var(--volt);
}

.page-about .about-rail__card {
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--paper-white);
  border: 2px solid var(--ink);
  border-radius: var(--r);
  box-shadow: var(--shadow-sm);
}

.page-about .about-rail__card-title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--steel);
}

.page-about .about-rail__card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-rail__card li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px;
  font-size: 13px;
  border-bottom: 1px dashed var(--grid);
  padding-bottom: 6px;
}

.page-about .about-rail__card li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-rail__card strong {
  color: var(--milan-red);
  font-weight: 700;
}

.page-about .about-rail__top {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--ink);
}

.page-about .about-rail__top:hover {
  color: var(--milan-red);
  border-color: var(--milan-red);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 8px 0 28px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-display-l);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.02em;
  transform: skewX(-2deg);
  transform-origin: left bottom;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-fact {
  padding: 14px 16px;
  background: var(--paper-white);
  border: var(--bw) solid var(--ink);
  border-radius: var(--r);
  box-shadow: var(--shadow-sm);
  font-size: 13px;
  color: var(--steel);
}

.page-about .about-num {
  display: block;
  margin-bottom: 4px;
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1;
  color: var(--ink);
  font-weight: 700;
  box-shadow: inset 0 -6px 0 var(--volt);
  width: fit-content;
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding-block: 32px;
  border-top: var(--bw) solid var(--ink);
}

.page-about .about-section__head {
  margin-bottom: 18px;
}

.page-about .about-chapter {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--milan-red);
  transform: rotate(-2deg);
  transform-origin: left bottom;
}

.page-about .about-section h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 38px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-about .about-section h3,
.page-about .about-subhead {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
}

.page-about .about-subhead {
  margin: 28px 0 12px;
}

.page-about .prose p {
  margin: 0 0 14px;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--graphite);
}

.page-about .about-lead {
  margin: 0 0 8px;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-note {
  margin: 18px 0 0;
  padding-left: 12px;
  border-left: 4px solid var(--milan-red);
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.page-about .about-note a {
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--milan-red);
}

.page-about .about-note a:hover {
  color: var(--milan-red);
}

/* ---------- 图文分栏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-figure {
  margin: 0;
  background: var(--graphite);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-about .about-figure--team img {
  aspect-ratio: 3 / 2;
}

.page-about .about-split .media-frame--tall img {
  aspect-ratio: 3 / 2;
}

/* ---------- 赛事标签 ---------- */

.page-about .about-tags {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tags li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  background: var(--paper-white);
  border: 2px solid var(--ink);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
}

.page-about .about-tags li:nth-child(2) {
  background: var(--volt);
}

.page-about .about-tags .mono {
  font-size: 11px;
  color: var(--steel);
}

.page-about .about-tags li:nth-child(2) .mono {
  color: var(--ink);
}

/* ---------- 检索入口 ---------- */

.page-about .about-entries {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-entries li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  background: var(--ink);
  color: var(--paper-white);
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
}

.page-about .about-entries .mono {
  font-size: 11px;
  color: var(--volt);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .about-team__num {
  padding: 14px;
  background: var(--ink);
  color: var(--paper-white);
  border: var(--bw) solid var(--ink);
  border-radius: var(--r);
  box-shadow: var(--shadow);
  font-size: 13px;
}

.page-about .about-team__num .mono {
  display: block;
  margin-bottom: 6px;
  font-size: clamp(34px, 7vw, 52px);
  line-height: 1;
  color: var(--volt);
  font-weight: 700;
}

.page-about .about-flow {
  gap: 14px;
}

.page-about .about-flow__card {
  padding: 18px;
  border-left: 8px solid var(--milan-red);
}

.page-about .about-flow__card h3 {
  margin: 0 0 8px;
}

.page-about .about-flow__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-flow__card--ink {
  background: var(--ink);
  color: var(--paper-white);
  border-left-color: var(--volt);
}

.page-about .about-flow__card--ink h3 {
  color: var(--paper-white);
}

.page-about .about-flow__card--ink p {
  color: var(--paper);
}

.page-about .about-figure--team {
  margin-top: 20px;
}

/* ---------- 时间轴 ---------- */

.page-about .about-track {
  margin-top: 18px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .about-track:focus-visible {
  outline: 3px solid var(--milan-red);
  outline-offset: 4px;
}

.page-about .about-track__list {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin: 0;
  padding: 2px 2px 8px;
  list-style: none;
  min-width: max-content;
}

.page-about .about-node {
  width: 232px;
  background: var(--paper-white);
  border: var(--bw) solid var(--ink);
  border-radius: var(--r);
  box-shadow: var(--shadow-sm);
}

.page-about .about-node summary {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 800;
  font-size: 15px;
  line-height: 1.4;
}

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

.page-about .about-node summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--milan-red);
}

.page-about .about-node[open] summary::after {
  content: "－";
  color: var(--volt);
}

.page-about .about-node summary .mono {
  font-size: 22px;
  color: var(--milan-red);
  font-weight: 700;
}

.page-about .about-node p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.page-about .about-node[open] {
  background: var(--ink);
  color: var(--paper-white);
}

.page-about .about-node[open] summary .mono {
  color: var(--volt);
}

.page-about .about-node[open] p {
  color: var(--paper);
}

.page-about .about-track__hint {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--steel);
}

/* ---------- 山西 ---------- */

.page-about .about-split--reverse .about-split__text {
  order: 1;
}

.page-about .about-cities {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cities li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background:
    repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 12px),
    var(--paper-white);
  border: 2px solid var(--ink);
  border-radius: 10px;
  font-weight: 800;
  font-size: 15px;
}

.page-about .about-cities .mono {
  font-size: 11px;
  color: var(--milan-red);
}

/* ---------- 长期做法 ---------- */

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

.page-about .about-practice__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 2px solid var(--grid);
}

.page-about .about-practice__item:first-child {
  border-top: 2px solid var(--grid);
}

.page-about .about-practice__item .mono {
  font-size: 13px;
  font-weight: 700;
  color: var(--milan-red);
  padding-top: 3px;
}

.page-about .about-practice__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.page-about .about-practice__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

/* ---------- 结尾行动 ---------- */

.page-about .about-cta {
  margin-top: 28px;
  padding: 20px;
  background: var(--milan-red);
  border: var(--bw) solid var(--ink);
  border-radius: var(--r);
  box-shadow: var(--shadow);
  color: var(--paper-white);
}

.page-about .about-cta__text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.7;
  font-weight: 700;
  color: var(--paper-white);
}

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

.page-about .about-cta .btn {
  border-color: var(--ink);
}

/* ---------- 中等屏幕 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-team__num {
    padding: 20px;
  }
}

@media (min-width: 860px) {
  .page-about .about-section {
    padding-block: 44px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

  .page-about .about-split--reverse .about-split__text {
    order: 2;
  }

  .page-about .about-hero {
    padding-bottom: 36px;
  }

  .page-about .about-rail__card {
    max-width: 300px;
  }
}

/* ---------- 桌面：固定左栏 ---------- */

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 272px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
    padding-top: 20px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-top: 0;
    border-left: var(--bw) solid var(--ink);
    padding: 4px 0 4px 18px;
  }

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

  .page-about .about-rail__list a {
    width: 100%;
    border: 0;
    border-radius: 0;
    border-bottom: 1px dashed var(--grid);
    background: transparent;
    padding: 8px 0;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    background: transparent;
    color: var(--milan-red);
  }

  .page-about .about-rail__list a:hover .mono,
  .page-about .about-rail__list a:focus-visible .mono {
    color: var(--milan-red);
  }

  .page-about .about-node {
    width: 260px;
  }
}
<<<END>>>