.page-about {
  --about-rule: rgba(42, 58, 74, 0.62);
  --about-rail-w: 15rem;
  padding-bottom: clamp(3rem, 7vw, 6rem);
}

.page-about .crumbs {
  margin-top: clamp(1rem, 3vw, 1.8rem);
  font-size: 0.78rem;
  color: var(--muted);
}

.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 外壳：左窄栏 + 右宽栏 ---------- */
.about-shell {
  display: grid;
  gap: clamp(1.8rem, 4vw, 2.4rem);
  margin-top: clamp(1.2rem, 3vw, 2rem);
}

.about-rail__meta {
  margin: 0 0 0.8rem;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.about-rail__line {
  margin: 0 0 1.3rem;
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--muted);
}

.about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding-top: 1rem;
  border-top: 1px solid var(--about-rule);
}

.about-toc a {
  padding: 0.34rem 0.7rem;
  font-size: 0.8rem;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--about-rule);
  border-radius: var(--r);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.about-toc a:hover {
  color: var(--paper);
  background: var(--glass);
  border-color: var(--cyan);
}

.about-toc a[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.about-hero__title {
  margin: 0 0 1.1rem;
  font-size: clamp(2.1rem, 6.2vw, 3.9rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
  color: var(--paper);
}

.about-hero__lead {
  max-width: 44rem;
  margin: 0 0 2rem;
  font-size: clamp(1rem, 1.7vw, 1.1rem);
  line-height: 1.85;
  color: var(--muted);
}

.about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.about-fact {
  padding: 1rem 0.8rem 1rem 0;
  border-bottom: 1px solid var(--about-rule);
  min-width: 0;
}

.about-fact__num {
  display: block;
  font-size: clamp(1.55rem, 3.4vw, 2.25rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.about-fact__unit {
  margin-left: 0.1em;
  font-size: 0.5em;
  color: var(--muted);
}

.about-fact__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  color: var(--muted);
}

/* ---------- 通用分节 ---------- */
.about-sec {
  margin-top: clamp(2.8rem, 6vw, 4.6rem);
}

.about-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--about-rule);
}

.about-sec__title {
  margin: 0;
  font-size: clamp(1.35rem, 2.7vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.about-sec__note {
  margin: 0 0 0 auto;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.about-body p {
  line-height: 1.85;
  color: var(--paper);
}

.about-body p + p {
  margin-top: 0.9rem;
}

.about-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(85, 230, 210, 0.35);
  transition: border-color var(--dur) var(--ease);
}

.about-body a:hover {
  border-bottom-color: var(--cyan);
}

.about-cols {
  display: grid;
  gap: 1.2rem;
  margin-bottom: 1.2rem;
}

.about-callout {
  margin: 0;
  padding: 0.15rem 0 0.15rem 1rem;
  border-left: 2px solid var(--cyan);
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--paper);
}

.about-figure {
  margin: 0 0 1.5rem;
}

.about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-rule);
  border-radius: var(--r);
  background: var(--raise);
  object-fit: cover;
}

/* ---------- 时间轴 ---------- */
.about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.tl-item {
  position: relative;
  display: grid;
  gap: 0.2rem;
  padding: 0 0 1.5rem 1.4rem;
  border-left: 1px solid var(--about-rule);
}

.tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.tl-item::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  left: -5px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(85, 230, 210, 0.13);
}

.tl-item--live::before {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 184, 75, 0.13);
}

.tl-year {
  font-size: clamp(1.4rem, 3vw, 1.95rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.tl-title {
  margin: 0 0 0.25rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.tl-item:hover .tl-title {
  color: var(--cyan);
}

.tl-text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队比例带 ---------- */
.about-band {
  display: flex;
  gap: 3px;
  height: 5.6rem;
  margin: 1.2rem 0 1.4rem;
}

.band__seg {
  display: flex;
  flex: var(--g, 1) 1 0;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.15rem;
  min-width: 0;
  padding: 0.5rem 0.45rem;
  background: var(--surface);
  border: 1px solid var(--about-rule);
  border-top: 3px solid var(--line);
  border-radius: var(--r);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.band__seg:hover,
.band__seg:focus-within {
  background: var(--raise);
  transform: translateY(-2px);
}

.band__seg--a { --g: 7; border-top-color: var(--cyan); }
.band__seg--b { --g: 4; border-top-color: var(--amber); }
.band__seg--c { --g: 3; border-top-color: var(--moss); }
.band__seg--d { --g: 4; border-top-color: var(--clay); }

.band__num {
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.1;
  color: var(--paper);
}

.band__name {
  font-size: 0.7rem;
  line-height: 1.25;
  color: var(--muted);
  word-break: break-all;
}

.about-roles {
  display: grid;
  gap: 0.7rem;
  margin: 0 0 1.6rem;
  padding: 0;
  list-style: none;
}

.about-roles li {
  padding-top: 0.6rem;
  border-top: 1px solid var(--about-rule);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

.about-roles strong {
  color: var(--paper);
}

/* ---------- 服务范围面板 ---------- */
.reach-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(1.2rem, 3vw, 2.2rem);
  background: var(--surface);
  border: 1px solid var(--about-rule);
  border-radius: var(--r);
}

.reach-panel__art {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(42, 58, 74, 0.55) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, rgba(42, 58, 74, 0.55) 0 1px, transparent 1px 64px),
    radial-gradient(circle at 78% 8%, rgba(85, 230, 210, 0.16), transparent 62%);
}

.reach-panel__lead {
  position: relative;
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--paper);
}

.stat-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1.4rem;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.stat {
  padding: 0.95rem 0.9rem;
  background: var(--surface);
  min-width: 0;
}

.stat:nth-child(even) {
  background: var(--raise);
}

.stat__num {
  display: block;
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.stat--amber .stat__num {
  color: var(--amber);
}

.stat__unit {
  margin-left: 0.1em;
  font-size: 0.5em;
  color: var(--muted);
}

.stat__label {
  display: block;
  margin-top: 0.32rem;
  font-size: 0.76rem;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.eco-grid {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.3rem;
}

.eco-card {
  padding: 1.1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--about-rule);
  border-radius: var(--r);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.eco-card:hover {
  background: var(--raise);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.eco-card__num {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
}

.eco-card h3 {
  margin: 0.55rem 0 0.4rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--paper);
}

.eco-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--muted);
}

.eco-card--wide {
  background: linear-gradient(150deg, var(--raise), var(--surface));
}

/* ---------- 结尾入口 ---------- */
.about-next {
  margin-top: clamp(2.8rem, 6vw, 4.6rem);
}

.next-grid {
  display: grid;
  gap: 0.9rem;
}

.next-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: clamp(1.1rem, 3vw, 1.5rem);
  background: linear-gradient(160deg, var(--raise), var(--surface));
  border: 1px solid var(--about-rule);
  border-radius: var(--r);
}

.next-card__kicker {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.next-card h3 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.next-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

.next-card .btn {
  align-self: flex-start;
  margin-top: 0.35rem;
}

.next-links {
  margin-top: 1.1rem;
  font-size: 0.85rem;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .about-fact {
    padding-right: 1rem;
    border-bottom: none;
    border-top: 3px solid transparent;
  }

  .about-fact:first-child {
    border-top-color: var(--cyan);
  }

  .about-fact:nth-child(2) {
    border-top-color: var(--amber);
  }

  .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem 1.6rem;
  }

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

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

  .eco-card--wide {
    grid-column: 1 / -1;
  }

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

@media (min-width: 960px) {
  .about-shell {
    grid-template-columns: minmax(180px, var(--about-rail-w)) minmax(0, 1fr);
    column-gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }

  .about-rail {
    position: sticky;
    top: 7.5rem;
  }

  .about-toc {
    flex-direction: column;
    gap: 0;
    padding-top: 0;
    border-top: none;
    border-left: 1px solid var(--about-rule);
  }

  .about-toc a {
    margin-left: -1px;
    padding: 0.4rem 0 0.4rem 1rem;
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 0.82rem;
  }

  .about-toc a:hover {
    background: transparent;
    border-left-color: var(--muted);
    color: var(--paper);
  }

  .about-toc a[aria-current="true"] {
    border-left-color: var(--cyan);
    background: transparent;
  }

  .about-cols {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 1.6rem 2.4rem;
    align-items: start;
  }

  .tl-item {
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: 0 1.2rem;
    padding-bottom: 1.8rem;
  }

  .tl-year {
    font-size: 1.95rem;
  }

  .about-band {
    height: 6.4rem;
  }

  .band__num {
    font-size: 1.55rem;
  }

  .band__name {
    font-size: 0.76rem;
  }
}

@media (min-width: 1120px) {
  .about-hero__title {
    max-width: 20ch;
  }
}
<<<END>>>