.page-about {
  --about-num: clamp(1.5rem, 2.8vw, 2.2rem);
  --about-rail: 104px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(22px, 4vw, 52px) 0 clamp(18px, 2.6vw, 30px);
  border-bottom: 1px solid var(--line);
  background-image:
    linear-gradient(to right, rgba(43, 76, 65, 0.35) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43, 76, 65, 0.35) 1px, transparent 1px);
  background-size: 64px 64px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -8%;
  width: 64%;
  height: 150%;
  background: var(--ink-2);
  clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 100%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(16px, 2.4vw, 28px);
}

.page-about .kicker {
  margin: 0 0 14px;
}

.page-about .about-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 5vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-lede {
  max-width: 60ch;
  margin: clamp(14px, 2vw, 22px) 0 0;
  font-size: clamp(0.95rem, 1.6vw, 1.0625rem);
  line-height: 1.85;
  color: var(--muted);
}

/* 数据摘要条 */
.page-about .about-stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  background: rgba(6, 27, 22, 0.82);
  padding: 14px 14px 16px;
}

.page-about .about-stat dt {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-stat dd {
  margin: 8px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  font-weight: 700;
  color: var(--ice);
  line-height: 1;
}

.page-about .stat-unit {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange-soft);
}

/* 章节索引 */
.page-about .about-index {
  margin-top: clamp(20px, 3vw, 34px);
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.page-about .about-index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding-bottom: 4px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.14s ease, border-color 0.14s ease;
}

.page-about .about-index-link .idx-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--cyan);
}

/* ---------- 纵向章节 ---------- */
.page-about .about-flow {
  padding-bottom: clamp(34px, 5vw, 72px);
}

.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 2vw, 22px);
  padding: clamp(30px, 5vw, 64px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-flow > .about-chapter:first-child {
  border-top: 0;
}

.page-about .chapter-rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .chapter-no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .chapter-rail::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

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

.page-about .chapter-title {
  margin: 0 0 clamp(12px, 1.8vw, 18px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 2.8vw, 2.2rem);
  line-height: 1.2;
  color: var(--paper);
}

.page-about .chapter-text {
  max-width: 66ch;
  margin: 0 0 14px;
  font-size: clamp(0.95rem, 1.4vw, 1rem);
  line-height: 1.9;
  color: var(--paper);
}

.page-about .chapter-text:last-of-type {
  margin-bottom: 0;
}

/* 图像容器 */
.page-about .about-media {
  margin: clamp(22px, 3vw, 34px) 0 0;
}

.page-about .about-media .media {
  border: 1px solid var(--line);
  overflow: hidden;
}

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

.page-about .about-media .media-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* 常用入口 */
.page-about .about-shortcut {
  margin-top: clamp(20px, 3vw, 30px);
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: var(--ink-2);
}

.page-about .shortcut-label {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--muted);
}

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

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .team-card {
  padding: 18px 16px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  transition: border-color 0.14s ease, background 0.14s ease;
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--cyan);
  background: #16453a;
}

.page-about .team-count {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
}

.page-about .team-count span {
  margin-left: 3px;
  font-size: 12px;
  font-family: var(--font-body);
  font-weight: 600;
  color: var(--orange-soft);
}

.page-about .team-name {
  margin: 12px 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .team-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .team-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.18s ease, opacity 0.18s ease, margin-top 0.18s ease;
}

.page-about .team-card:hover .team-tags,
.page-about .team-card:focus-within .team-tags {
  max-height: 96px;
  opacity: 1;
  margin-top: 12px;
}

/* ---------- 赛季演进 ---------- */
.page-about .year-list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0 0 0 clamp(16px, 2.6vw, 26px);
  border-left: 1px solid var(--line);
}

.page-about .year-item {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 30px);
}

.page-about .year-item:last-child {
  padding-bottom: 0;
}

.page-about .year-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(16px, 2.6vw, 26px) - 3px);
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--line);
}

.page-about .year-item--key::before {
  background: var(--orange);
}

.page-about .year-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
}

.page-about .year-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .year-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .year-text {
  margin: 7px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .year-details {
  margin-top: 10px;
  max-width: 62ch;
  border: 1px solid var(--line);
}

.page-about .year-details summary {
  padding: 9px 12px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted);
  cursor: pointer;
  list-style: none;
  transition: color 0.14s ease;
}

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

.page-about .year-details summary::after {
  content: "＋";
  float: right;
  color: var(--cyan);
  font-size: 13px;
}

.page-about .year-details[open] summary::after {
  content: "－";
}

.page-about .year-details summary:hover,
.page-about .year-details summary:focus-visible {
  color: var(--ice);
}

.page-about .year-details[open] summary {
  border-bottom: 1px solid var(--line);
  color: var(--ice);
}

.page-about .detail-body {
  padding: 12px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 内容复核 ---------- */
.page-about .proof-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(18px, 2.6vw, 26px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .proof-card {
  padding: 18px 18px 20px;
  background: var(--ink-2);
  transition: background 0.14s ease;
}

.page-about .proof-card:hover {
  background: var(--panel);
}

.page-about .proof-no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .proof-title {
  margin: 10px 0 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .proof-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-note {
  margin: clamp(18px, 2.4vw, 24px) 0 0;
  padding: 14px 16px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--paper);
  border-left: 3px solid var(--orange);
  background: var(--panel);
}

.page-about .note-mark {
  display: inline-block;
  margin-right: 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--orange-soft);
}

/* ---------- 服务节奏 ---------- */
.page-about .rhythm-list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .rhythm-item {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-2);
}

.page-about .rhythm-label {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .rhythm-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--paper);
}

/* ---------- 联系与协作 ---------- */
.page-about .contact-panel {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(18px, 2.6vw, 26px);
  padding: clamp(18px, 3vw, 32px);
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .contact-links {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .contact-link {
  display: grid;
  gap: 4px;
  padding: 14px 2px;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.14s ease, padding-left 0.14s ease;
}

.page-about .contact-link .link-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--paper);
  transition: color 0.14s ease;
}

.page-about .contact-link .link-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .contact-link:hover,
.page-about .contact-link:focus-visible {
  border-bottom-color: var(--cyan);
  padding-left: 8px;
}

.page-about .contact-link:hover .link-title,
.page-about .contact-link:focus-visible .link-title {
  color: var(--cyan);
}

.page-about .contact-heading {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--muted);
}

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

.page-about .contact-item {
  display: grid;
  gap: 3px;
}

.page-about .contact-label {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--orange-soft);
}

.page-about .contact-value {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  text-decoration: none;
  word-break: break-word;
  border-bottom: 1px solid transparent;
  transition: border-color 0.14s ease, color 0.14s ease;
}

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

.page-about .contact-value--plain {
  font-family: var(--font-body);
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .contact-note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(24px, 3.6vw, 56px);
  }

  .page-about .chapter-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .chapter-rail::after {
    width: 1px;
    height: auto;
    flex: 1;
    min-height: 56px;
    background: linear-gradient(to bottom, var(--line), transparent);
  }

  .page-about .rhythm-item {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }

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

@media (min-width: 1040px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding-bottom: 24px;
  }

  .page-about .team-card:nth-child(even) {
    transform: translateY(24px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index-link,
  .page-about .team-card,
  .page-about .team-tags,
  .page-about .proof-card,
  .page-about .contact-link,
  .page-about .contact-value,
  .page-about .year-details summary {
    transition: none;
  }

  .page-about .team-card:nth-child(even) {
    transform: none;
  }
}
<<<END>>>