.page-about {
  --about-tick: rgba(110, 140, 160, 0.34);
  --about-glow: rgba(232, 85, 45, 0.16);
  --about-clip: 20px;
  display: block;
  background-color: var(--ink);
  color: var(--sand);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding: 18px 0 0;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel-soft);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 10px;
  color: var(--steel);
}

.page-about .breadcrumb-link {
  color: var(--steel-soft);
  text-decoration: none;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--amber);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 30px 0 46px;
}

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

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--sand);
  text-wrap: balance;
}

.page-about .about-lede {
  margin: 0 0 26px;
  max-width: 44ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--steel-soft);
}

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

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 22px;
  border: 1px solid var(--lava);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease;
}

.page-about .btn--solid {
  background-color: var(--lava);
  color: var(--sand);
}

.page-about .btn--solid:hover,
.page-about .btn--solid:focus-visible {
  background-color: var(--amber);
  border-color: var(--amber);
  color: var(--ink);
}

.page-about .btn--ghost {
  background-color: transparent;
  border-color: var(--line);
  color: var(--sand);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--amber);
  color: var(--amber);
}

.page-about .btn--quiet {
  background-color: transparent;
  border-color: var(--line);
  color: var(--steel-soft);
}

.page-about .btn--quiet:hover,
.page-about .btn--quiet:focus-visible {
  border-color: var(--steel-soft);
  color: var(--sand);
}

.page-about .about-board {
  position: relative;
  padding: 22px 20px 26px;
  border: 1px solid var(--line);
  background-color: var(--panel);
  background-image:
    repeating-linear-gradient(90deg, var(--about-tick) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, var(--about-tick) 0 1px, transparent 1px 48px),
    radial-gradient(circle at 80% 0%, var(--about-glow), transparent 60%);
  background-size: 48px 48px, 48px 48px, 100% 100%;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-clip)), calc(100% - var(--about-clip)) 100%, 0 100%);
}

.page-about .board-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.page-about .coord {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--steel-soft);
}

.page-about .tag {
  display: inline-block;
  padding: 4px 9px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel-soft);
  white-space: nowrap;
}

.page-about .tag--amber {
  border-color: var(--amber);
  color: var(--amber);
}

.page-about .board-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(58px, 15vw, 104px);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: var(--amber);
}

.page-about .board-scale {
  height: 10px;
  margin: 18px 0 20px;
  background-image: repeating-linear-gradient(90deg, var(--steel) 0 1px, transparent 1px 18px);
  border-bottom: 1px solid var(--line);
}

.page-about .board-facts {
  display: grid;
  gap: 14px;
  margin: 0;
}

.page-about .board-fact {
  display: grid;
  gap: 3px;
  padding-left: 12px;
  border-left: 2px solid var(--pitch);
}

.page-about .board-fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .board-fact dd {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  color: var(--sand);
}

.page-about .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

/* ---------- 章节通用 ---------- */
.page-about .about-timeline,
.page-about .about-lines,
.page-about .about-process,
.page-about .about-local,
.page-about .about-team,
.page-about .about-quarter {
  padding: 48px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .section-head {
  margin-bottom: 30px;
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 5vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.005em;
  color: var(--sand);
}

.page-about .section-sub {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel-soft);
}

.page-about .inline-link {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color 180ms ease;
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  border-color: var(--amber);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-grid {
  display: grid;
  gap: 32px;
}

.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 12px;
  left: 8px;
  width: 1px;
  background-color: var(--line);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  top: 5px;
  left: -30px;
  width: 11px;
  height: 11px;
  background-color: var(--panel);
  border: 1px solid var(--steel);
  transition: background-color 200ms ease, border-color 200ms ease;
}

.page-about .tl-item:hover::before {
  background-color: var(--lava);
  border-color: var(--lava);
}

.page-about .tl-mark {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--sand);
}

.page-about .tl-text {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--steel-soft);
}

.page-about .tl-note {
  margin: 0;
  padding-left: 11px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
  transition: color 200ms ease, border-color 200ms ease;
}

.page-about .tl-item:hover .tl-note {
  color: var(--steel-soft);
  border-left-color: var(--amber);
}

.page-about .tl-aside {
  padding: 20px 18px;
  border: 1px solid var(--line);
  background-color: var(--panel);
}

.page-about .aside-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lava);
}

.page-about .aside-item {
  display: grid;
  gap: 2px;
  padding: 11px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .aside-item:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-about .aside-num {
  font-size: 24px;
  line-height: 1.1;
}

.page-about .aside-label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--steel-soft);
}

/* ---------- 三条内容线 ---------- */
.page-about .lines-grid {
  display: grid;
  gap: 26px;
}

.page-about .lines-list {
  display: grid;
  gap: 1px;
  background-color: var(--line-soft);
  border-top: 1px solid var(--line);
}

.page-about .line-row {
  display: grid;
  gap: 10px;
  padding: 20px 16px;
  background-color: var(--ink);
  border-left: 3px solid transparent;
  transition: border-color 200ms ease, background-color 200ms ease;
}

.page-about .line-row:hover {
  border-left-color: var(--lava);
  background-color: var(--panel);
}

.page-about .line-no {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .line-name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--sand);
}

.page-about .line-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--steel-soft);
}

.page-about .line-tag {
  justify-self: start;
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.92);
}

.page-about .about-figure--lines img {
  aspect-ratio: 4 / 3;
}

.page-about .media-caption {
  margin-top: 10px;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 四道工序 ---------- */
.page-about .process-grid {
  display: grid;
  gap: 28px;
}

.page-about .steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .step {
  padding: 16px 16px 18px;
  background-color: var(--panel);
  border-top: 2px solid var(--pitch);
}

.page-about .step-no {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--lava);
}

.page-about .step-name {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--sand);
}

.page-about .step-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--steel-soft);
}

.page-about .process-tail {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel-soft);
}

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

/* ---------- 全宽图片带 ---------- */
.page-about .about-band {
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .band-figure {
  position: relative;
  margin: 0;
}

.page-about .band-figure img {
  display: block;
  width: 100%;
  height: clamp(200px, 44vw, 430px);
  object-fit: cover;
  max-width: 100%;
  filter: saturate(0.85) brightness(0.9);
}

.page-about .band-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 31, 23, 0.35) 0%, rgba(11, 31, 23, 0.05) 38%, rgba(11, 31, 23, 0.92) 100%);
  pointer-events: none;
}

.page-about .band-caption {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  z-index: 1;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--sand);
}

/* ---------- 本地生态 ---------- */
.page-about .local-grid {
  display: grid;
  gap: 28px;
}

.page-about .local-text {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--steel-soft);
}

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

.page-about .local-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel-soft);
}

.page-about .local-list li::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 0;
  width: 12px;
  height: 2px;
  background-color: var(--lava);
}

.page-about .local-list strong {
  color: var(--sand);
  font-weight: 700;
  margin-right: 6px;
}

.page-about .local-side {
  padding: 20px 18px;
  border: 1px solid var(--line);
  background-color: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--about-clip) 100%, 0 calc(100% - var(--about-clip)));
}

.page-about .side-stat {
  display: grid;
  gap: 2px;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .side-num {
  font-size: clamp(38px, 9vw, 54px);
  line-height: 1;
  color: var(--amber);
}

.page-about .side-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel-soft);
}

.page-about .side-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .team-stack {
  display: flex;
  height: 14px;
  margin-bottom: 26px;
  border: 1px solid var(--line);
}

.page-about .team-stack span {
  display: block;
  height: 100%;
}

.page-about .stack-a {
  width: 56%;
  background-color: var(--lava);
}

.page-about .stack-b {
  width: 26%;
  background-color: var(--amber);
}

.page-about .stack-c {
  width: 18%;
  background-color: var(--pitch);
}

.page-about .team-list {
  display: grid;
  gap: 10px;
}

.page-about .team-item {
  border: 1px solid var(--line);
  background-color: var(--panel);
}

.page-about .team-item > summary {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .team-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .team-item > summary:hover .team-name,
.page-about .team-item > summary:focus-visible .team-name {
  color: var(--amber);
}

.page-about .team-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--sand);
  transition: color 180ms ease;
}

.page-about .team-count {
  font-size: 14px;
}

.page-about .team-bar {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  background-color: var(--line-soft);
}

.page-about .team-bar-fill {
  display: block;
  height: 100%;
}

.page-about .team-bar-fill--a {
  width: 56%;
  background-color: var(--lava);
}

.page-about .team-bar-fill--b {
  width: 26%;
  background-color: var(--amber);
}

.page-about .team-bar-fill--c {
  width: 18%;
  background-color: var(--pitch);
}

.page-about .team-desc {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel-soft);
}

/* ---------- 季度观察 ---------- */
.page-about .quarter-grid {
  display: grid;
  gap: 28px;
}

.page-about .quarter-text {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--steel-soft);
  max-width: 52ch;
}

.page-about .quarter-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background-color: var(--line-soft);
}

.page-about .quarter-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 18px 16px;
  background-color: var(--ink);
}

.page-about .quarter-no {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--lava);
  padding-top: 2px;
}

.page-about .quarter-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel-soft);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 44px 0 56px;
  border-top: 1px solid var(--line-soft);
}

.page-about .cta-block {
  display: grid;
  gap: 24px;
  padding: 26px 20px;
  background-color: var(--panel);
  background-image: linear-gradient(150deg, rgba(232, 85, 45, 0.14), transparent 62%);
  border-left: 4px solid var(--lava);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-clip)), calc(100% - var(--about-clip)) 100%, 0 100%);
}

.page-about .cta-copy h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.25;
  color: var(--sand);
}

.page-about .cta-copy p {
  margin: 0;
  max-width: 54ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel-soft);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 40px 0 56px;
  }

  .page-about .about-board {
    padding: 26px 26px 30px;
  }

  .page-about .board-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .line-row {
    grid-template-columns: 44px minmax(0, 1fr);
    align-items: start;
    padding: 22px 20px;
  }

  .page-about .line-tag {
    grid-column: 2;
  }

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

  .page-about .band-caption {
    left: 24px;
    right: 24px;
    bottom: 20px;
    font-size: 13px;
  }

  .page-about .local-side,
  .page-about .tl-aside {
    padding: 24px 22px;
  }

  .page-about .team-item > summary {
    grid-template-columns: 1fr auto 160px;
    padding: 17px 20px;
  }

  .page-about .team-bar {
    grid-column: 3;
  }

  .page-about .team-desc {
    padding: 0 20px 18px;
  }

  .page-about .cta-block {
    grid-template-columns: minmax(0, 1.6fr) auto;
    align-items: center;
    padding: 32px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
  }

  .page-about .timeline-grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .lines-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .process-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .local-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .quarter-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-timeline,
  .page-about .about-lines,
  .page-about .about-process,
  .page-about .about-local,
  .page-about .about-team,
  .page-about .about-quarter {
    padding: 64px 0;
  }

  .page-about .section-head {
    margin-bottom: 38px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .btn,
  .page-about .tl-item::before,
  .page-about .tl-note,
  .page-about .line-row,
  .page-about .team-name,
  .page-about .inline-link {
    transition: none;
  }
}
<<<END>>>