.page-about {
  --about-hair: rgba(58, 71, 83, 0.62);
  --about-glow: rgba(53, 224, 208, 0.14);
  padding-bottom: 0;
}

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

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 4px 0 56px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -80px 0 auto 0;
  height: 400px;
  background: radial-gradient(62% 100% at 16% 0, rgba(18, 58, 78, 0.88), transparent 70%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__intro .display {
  margin: 0 0 20px;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-hair);
  list-style: none;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-hero__lab {
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}

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

.page-about .about-hero__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: linear-gradient(148deg, var(--steel), var(--steel-2));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

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

/* 起点：纵向时间带 */
.page-about .about-origin {
  padding: 8px 0 24px;
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 18px;
  padding: 28px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-flow__rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.page-about .about-flow__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--clay);
  writing-mode: vertical-rl;
}

.page-about .about-flow__dot {
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
  background: var(--clay);
  box-shadow: 0 0 0 4px rgba(169, 96, 63, 0.18);
  flex: none;
}

.page-about .about-flow__body h2 {
  margin: 0 0 16px;
  font-size: clamp(1.5rem, 1.1rem + 1.8vw, 2.15rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .about-flow__body p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
  max-width: 62ch;
}

.page-about .about-flow__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 4px;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

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

/* 三条主线 */
.page-about .about-lines {
  padding: 48px 0 16px;
}

.page-about .about-lines__head h2,
.page-about .about-team__text h2,
.page-about .about-stages__head h2,
.page-about .about-scale__head h2,
.page-about .about-craft__head h2 {
  margin: 0 0 16px;
  font-size: clamp(1.65rem, 1.1rem + 2.2vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-lines__lede {
  margin: 0 0 8px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-lines__grid {
  display: grid;
  gap: 18px;
  margin-top: 32px;
}

.page-about .about-line {
  position: relative;
  padding: 24px 22px 22px;
  background: var(--steel);
  border-left: 2px solid var(--rock);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-left-color 240ms var(--ease), background 240ms var(--ease);
}

.page-about .about-line:hover {
  border-left-color: var(--cyan);
  background: linear-gradient(180deg, var(--steel-2), var(--steel));
}

.page-about .about-line__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--clay);
  margin-bottom: 12px;
}

.page-about .about-line h3 {
  margin: 0 0 12px;
  font-size: 19px;
  line-height: 1.35;
  color: var(--ink);
  letter-spacing: 0.01em;
}

.page-about .about-line p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-line__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

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

/* 团队与分工 */
.page-about .about-team {
  padding: 48px 0 24px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-team__text > p {
  margin: 0 0 22px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}

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

.page-about .about-role {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  grid-template-areas:
    "n title"
    "n text";
  gap: 4px 16px;
  padding: 16px 18px;
  background: rgba(11, 34, 51, 0.7);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-role__n {
  grid-area: n;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 32px;
  line-height: 1;
  color: var(--moss);
  padding-top: 2px;
}

.page-about .about-role__t {
  grid-area: title;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.page-about .about-role p {
  grid-area: text;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-3);
}

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

.page-about .about-team__media {
  position: relative;
  aspect-ratio: 7 / 4;
  overflow: hidden;
  background: linear-gradient(200deg, var(--steel-2), var(--deep));
  clip-path: polygon(0 0, 100% 0, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

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

/* 发展阶段 */
.page-about .about-stages {
  padding: 56px 0 24px;
}

.page-about .about-stages__banner {
  margin: 0 0 26px;
}

.page-about .about-stages__media {
  position: relative;
  aspect-ratio: 8 / 3;
  overflow: hidden;
  background: linear-gradient(120deg, var(--steel), var(--steel-2) 60%, rgba(53, 224, 208, 0.28));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

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

.page-about .about-stages__tabs {
  display: flex;
  gap: 10px;
  list-style: none;
  margin: 0 0 24px;
  padding: 4px 2px 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-stages__tabs li {
  flex: none;
  scroll-snap-align: start;
}

.page-about .about-stages__tabs::-webkit-scrollbar {
  height: 4px;
}

.page-about .about-stages__tabs::-webkit-scrollbar-thumb {
  background: var(--rock);
  border-radius: 2px;
}

.page-about .about-stage-tab {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 44px;
  padding: 12px 20px 13px;
  background: var(--steel);
  color: var(--ink-2);
  text-decoration: none;
  border: 1px solid transparent;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 11px), calc(100% - 11px) 100%, 0 100%);
  transition: color 200ms var(--ease), background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-stage-tab:hover,
.page-about .about-stage-tab:focus-visible {
  color: var(--ink);
  background: var(--steel-2);
  border-color: var(--line-cyan);
}

.page-about .about-stage-tab__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--clay);
}

.page-about .about-stage-tab__v {
  font-size: 15px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.page-about .about-stages__panels {
  display: grid;
  gap: 4px;
}

.page-about .about-stage {
  padding: 20px 0 20px 20px;
  border-left: 2px solid var(--about-hair);
  scroll-margin-top: 96px;
  transition: border-left-color 240ms var(--ease), background 240ms var(--ease);
}

.page-about .about-stage:target {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, var(--about-glow), transparent 62%);
}

.page-about .about-stage__range {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--moss);
}

.page-about .about-stage h3 {
  margin: 0 0 12px;
  font-size: 20px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-stage > p {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

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

.page-about .about-stage__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-3);
}

.page-about .about-stage__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 6px;
  height: 6px;
  transform: rotate(45deg);
  background: var(--cyan);
  opacity: 0.7;
}

/* 体量 */
.page-about .about-scale {
  padding: 56px 0 24px;
}

.page-about .about-scale__grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-scale__cell {
  padding: 22px 20px;
  background: rgba(11, 34, 51, 0.76);
  border-top: 1px solid var(--about-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .about-scale__cell--accent {
  background: linear-gradient(150deg, var(--steel-2), var(--steel));
  border-top-color: var(--line-cyan);
}

.page-about .about-scale__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 1.4rem + 2.4vw, 3.1rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-scale__cell--accent .about-scale__num {
  color: var(--orange);
}

.page-about .about-scale__unit {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}

.page-about .about-scale__note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .about-scale__foot {
  margin: 26px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-2);
  padding-left: 16px;
  border-left: 2px solid var(--clay);
}

/* 三道环节 */
.page-about .about-craft {
  padding: 56px 0 24px;
}

.page-about .about-craft__lede {
  margin: 0 0 8px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-craft__steps {
  display: grid;
  gap: 14px;
  margin: 30px 0 34px;
}

.page-about .about-craft__step {
  padding: 22px 20px;
  background: var(--steel);
  border-left: 2px solid var(--moss);
}

.page-about .about-craft__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--moss);
  margin-bottom: 10px;
}

.page-about .about-craft__step h3 {
  margin: 0 0 10px;
  font-size: 18px;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .about-craft__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-2);
}

.page-about .about-craft__serve {
  padding: 26px 22px;
  background: linear-gradient(140deg, var(--steel-2), var(--steel) 70%);
  border-top: 1px solid var(--line-cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-craft__serve h3 {
  margin: 0 0 12px;
  font-size: 20px;
  color: var(--ink);
  line-height: 1.35;
}

.page-about .about-craft__serve p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-craft__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 194, 75, 0.45);
}

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

/* 收束 */
.page-about .about-close {
  margin-top: 56px;
  padding: 84px 0 76px;
  background: linear-gradient(150deg, var(--steel-2), var(--steel) 48%, var(--deep) 100%);
  clip-path: polygon(0 46px, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-close__title {
  margin: 0 0 16px;
  font-size: clamp(1.8rem, 1.2rem + 2.6vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-close__text {
  margin: 0 0 26px;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}

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

/* 平板 */
@media (min-width: 768px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .about-flow {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 28px;
    padding: 36px 0;
  }

  .page-about .about-lines__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-line--a {
    grid-column: 1 / span 7;
  }

  .page-about .about-line--b {
    grid-column: 8 / span 5;
    margin-top: 44px;
  }

  .page-about .about-line--c {
    grid-column: 2 / span 6;
    margin-top: -12px;
  }

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

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

  .page-about .about-role {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "n"
      "title"
      "text";
    gap: 8px;
  }

  .page-about .about-stages__panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 28px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-scale__cell--wide {
    grid-column: span 3;
  }

  .page-about .about-scale__cell {
    grid-column: span 3;
  }

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

  .page-about .about-craft__step {
    padding: 24px 22px;
    border-left-width: 1px;
  }

  .page-about .about-craft__step:first-child {
    border-left: 2px solid var(--moss);
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 12px 0 72px;
  }

  .page-about .about-hero__fig {
    margin-top: 28px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 44px;
  }

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

  .page-about .about-role {
    grid-template-columns: 62px minmax(0, 1fr);
    grid-template-areas:
      "n title"
      "n text";
    gap: 4px 16px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-scale__cell--wide {
    grid-column: span 5;
  }

  .page-about .about-scale__cell {
    grid-column: span 3;
  }

  .page-about .about-scale__cell--accent {
    grid-column: span 4;
  }

  .page-about .about-craft__serve {
    padding: 32px 30px;
  }

  .page-about .about-close {
    margin-top: 72px;
    padding: 104px 0 92px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line,
  .page-about .about-stage,
  .page-about .about-stage-tab {
    transition: none;
  }
}
<<<END>>>