.page-about {
  background: var(--ink);
  color: var(--bone);
}

.page-about .breadcrumbs {
  padding-top: clamp(16px, 2.5vw, 28px);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 40px) 0 clamp(48px, 7vw, 92px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.22;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at 28% 18%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse at 28% 18%, #000 0%, transparent 72%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-hero__index {
  margin: clamp(4px, 1vw, 12px) 0 clamp(6px, 1.2vw, 14px);
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(76px, 15vw, 168px);
  line-height: 0.84;
  letter-spacing: -0.06em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(216, 181, 106, 0.62);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(14px, 1.8vw, 20px);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(28px, 3.6vw, 46px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  max-width: 17em;
}

.page-about .about-hero__lead {
  max-width: 40em;
  margin: 0;
  color: var(--silver);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 3vw, 38px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 12px 16px;
  background: var(--ink);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(20px, 2.4vw, 28px);
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .about-fact__label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--silver);
}

.page-about .about-hero__media {
  margin: 0;
  align-self: end;
  box-shadow: 10px 10px 0 rgba(211, 34, 42, 0.32);
}

/* ============ 起点 ============ */
.page-about .about-origin {
  border-top: 1px solid var(--line);
  padding: clamp(40px, 6vw, 84px) 0;
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.5vw, 56px);
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  max-width: 42em;
  color: var(--silver);
  font-size: 15.5px;
  line-height: 1.85;
}

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

/* ============ 时间线 ============ */
.page-about .about-timeline {
  border-top: 1px solid var(--line);
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-head {
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-head__lead {
  max-width: 42em;
  margin: 14px 0 0;
  color: var(--silver);
  font-size: 15.5px;
  line-height: 1.85;
}

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

.page-about .about-line::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 9px;
  width: 2px;
  background: linear-gradient(180deg, var(--line), var(--gold) 45%, var(--line));
}

.page-about .about-line__item {
  position: relative;
  padding: 0 0 34px 44px;
}

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

.page-about .about-line__node {
  position: absolute;
  left: 0;
  top: 6px;
  width: 20px;
  height: 20px;
  border: 2px solid var(--line);
  background: var(--ink);
  transform: rotate(45deg);
  transition: border-color var(--t), background var(--t), box-shadow var(--t);
}

.page-about .about-line__item:hover .about-line__node,
.page-about .about-line__item:focus-within .about-line__node {
  border-color: var(--gold);
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(216, 181, 106, 0.14);
}

.page-about .about-line__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-line__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.35;
  color: var(--bone);
}

.page-about .about-line__card p {
  margin: 0 0 10px;
  max-width: 40em;
  color: var(--silver);
  font-size: 14.5px;
  line-height: 1.8;
}

.page-about .about-line__focus {
  display: inline-block;
  margin: 0;
  padding: 5px 10px;
  border-left: 2px solid var(--teal);
  background: rgba(46, 125, 107, 0.1);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--silver);
  transition: border-color var(--t), color var(--t);
}

.page-about .about-line__item:hover .about-line__focus,
.page-about .about-line__item:focus-within .about-line__focus {
  border-color: var(--gold);
  color: var(--gold-light);
}

/* ============ 团队 ============ */
.page-about .about-team {
  border-top: 1px solid var(--line);
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-team__media {
  margin: 0;
  border: var(--edge) solid var(--line);
}

.page-about .about-team__lead {
  max-width: 38em;
  margin: 14px 0 clamp(22px, 3vw, 34px);
  color: var(--silver);
  font-size: 15.5px;
  line-height: 1.85;
}

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

.page-about .about-roles::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 14px;
  bottom: 22px;
  width: 2px;
  background: linear-gradient(180deg, var(--line), var(--teal));
}

.page-about .about-role {
  position: relative;
  padding: 0 0 24px 44px;
  transition: transform var(--t);
}

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

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 7px;
  width: 18px;
  height: 18px;
  border: 2px solid var(--line);
  border-radius: 50%;
  background: var(--ink);
  transition: border-color var(--t), background var(--t), box-shadow var(--t);
}

.page-about .about-role:hover::before,
.page-about .about-role:focus-within::before {
  border-color: var(--gold);
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(216, 181, 106, 0.14);
}

.page-about .about-role__no {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-role h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  color: var(--bone);
}

.page-about .about-role p {
  margin: 0;
  max-width: 40em;
  color: var(--silver);
  font-size: 14.5px;
  line-height: 1.8;
}

.page-about .about-team__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  background: var(--deep);
  color: var(--silver);
  font-size: 14px;
  line-height: 1.8;
}

/* ============ 覆盖 ============ */
.page-about .about-reach {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--deep), var(--ink) 78%);
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .about-reach__map {
  position: relative;
  padding: clamp(12px, 2vw, 24px);
  border: 1px solid var(--line);
  background-image:
    linear-gradient(rgba(42, 74, 63, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 74, 63, 0.35) 1px, transparent 1px);
  background-size: 40px 40px;
}

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

.page-about .about-map__dot {
  fill: var(--line);
  transform-box: fill-box;
  transform-origin: center;
  transition: fill var(--t), transform var(--t);
}

.page-about .about-map__dot:nth-child(7n) {
  fill: rgba(216, 181, 106, 0.55);
}

.page-about .about-map__dot:nth-child(5n) {
  fill: rgba(46, 125, 107, 0.7);
}

.page-about .about-map__dot:hover {
  fill: var(--gold-light);
  transform: scale(1.7);
}

.page-about .about-reach__cap {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--silver);
  opacity: 0.8;
}

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

.page-about .about-legend li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 13px 14px;
  background: var(--ink);
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
  transition: background var(--t);
}

.page-about .about-legend li:hover {
  background: var(--felt);
}

.page-about .about-legend strong {
  color: var(--bone);
  font-weight: 800;
}

.page-about .about-legend__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

/* ============ 交付流程 ============ */
.page-about .about-quality {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-flow__step {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px 20px;
  background: var(--ink);
  transition: background var(--t);
}

.page-about .about-flow__step:hover {
  background: var(--felt);
}

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

.page-about .about-flow__step h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
  color: var(--bone);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-quality__strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 2.6vw, 28px);
}

/* ============ 合作生态 ============ */
.page-about .about-eco {
  border-top: 1px solid var(--line);
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.page-about .about-eco__lead {
  max-width: 32em;
  margin: 14px 0 0;
  color: var(--silver);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-top: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-eco__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  padding: 16px 2px 16px 0;
  background: var(--ink);
}

.page-about .about-eco__list h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  color: var(--bone);
}

.page-about .about-eco__list p {
  grid-column: 2;
  margin: 0;
  max-width: 40em;
  color: var(--silver);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-eco__no {
  grid-row: span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-eco__media {
  margin: clamp(28px, 4vw, 48px) 0 0;
  aspect-ratio: 1200 / 700;
  border: var(--edge) solid var(--line);
}

/* ============ 下一步 ============ */
.page-about .about-next {
  border-top: 1px solid var(--line);
  background: var(--deep);
  padding: clamp(44px, 6vw, 88px) 0 clamp(52px, 7vw, 100px);
}

.page-about .about-next h2 {
  margin: 12px 0 clamp(24px, 3.5vw, 38px);
}

.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-top: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-next__links a {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  padding: 16px 4px 16px 0;
  background: transparent;
  color: var(--bone);
  text-decoration: none;
  transition: background var(--t), padding-left var(--t);
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  background: rgba(211, 34, 42, 0.12);
  padding-left: 12px;
}

.page-about .about-next__no {
  grid-row: span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-next__label {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -0.01em;
}

.page-about .about-next__hint {
  grid-column: 2;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--silver);
}

/* ============ 断点 ============ */
@media (min-width: 720px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-origin__grid {
    grid-template-columns: 0.85fr 1.15fr;
    align-items: start;
  }

  .page-about .about-reach__grid {
    grid-template-columns: 1.35fr 0.65fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: end;
  }

  .page-about .about-line::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .about-line__item {
    width: 50%;
    padding: 0 0 52px;
  }

  .page-about .about-line__item:nth-child(odd) {
    padding-right: 48px;
  }

  .page-about .about-line__item:nth-child(even) {
    margin-left: 50%;
    padding-left: 48px;
  }

  .page-about .about-line__item:nth-child(odd) .about-line__node {
    left: auto;
    right: -10px;
  }

  .page-about .about-line__item:nth-child(even) .about-line__node {
    left: -10px;
  }

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

  .page-about .about-head__lead {
    margin-left: auto;
  }
}

@media (min-width: 960px) {
  .page-about .about-team__grid {
    grid-template-columns: 0.78fr 1.22fr;
  }

  .page-about .about-eco__grid {
    grid-template-columns: 0.8fr 1.2fr;
  }
}

@media (min-width: 1080px) {
  .page-about .about-flow {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__dot,
  .page-about .about-role,
  .page-about .about-next__links a {
    transition: none;
  }

  .page-about .about-map__dot:hover {
    transform: none;
  }
}
<<<END>>>