.page-about {
  --ab-line: rgba(143, 179, 199, 0.18);
  --ab-line-strong: rgba(143, 179, 199, 0.34);
  --ab-ink-soft: #38434f;
  --ab-ink-mute: #5b6773;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(120% 140% at 88% -10%, rgba(61, 242, 208, 0.14), transparent 58%),
    radial-gradient(90% 120% at 0% 0%, rgba(255, 106, 43, 0.10), transparent 62%),
    var(--ink-950);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .about-hero__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(24px, 5vw, 56px) var(--gutter) clamp(26px, 4vw, 44px);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .breadcrumb a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .about-hero__kicker {
  display: inline-block;
  margin: 0 0 clamp(16px, 2.6vw, 22px);
  padding: 5px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--ink-950);
  background: var(--orange);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 6.2vw, 66px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  max-width: 60ch;
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.82;
  color: var(--paper-dim);
}

.page-about .about-hero__stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  max-width: 760px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px;
  background: var(--ink-950);
}

.page-about .about-hero__stat b {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__stat span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: clamp(140px, 25vw, 300px);
  max-width: 100%;
  object-fit: cover;
  object-position: center;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(7, 17, 31, 0.86) 0%,
    rgba(7, 17, 31, 0.22) 48%,
    rgba(61, 242, 208, 0.12) 100%
  );
  pointer-events: none;
}

/* ---------- 布局 ---------- */
.page-about .about-layout {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(28px, 5vw, 60px) var(--gutter) clamp(44px, 7vw, 88px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-canvas {
  min-width: 0;
}

/* ---------- 侧轨 ---------- */
.page-about .about-rail {
  min-width: 0;
  border-bottom: 1px solid var(--ab-line);
  padding-bottom: 10px;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .about-rail__list {
  list-style: none;
  display: flex;
  gap: 2px;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: block;
  padding: 9px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  white-space: nowrap;
  text-decoration: none;
  color: var(--steel);
  border-bottom: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .about-rail__link.is-active,
.page-about .about-rail__link[aria-current] {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-rail__top {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-rail__top:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .block {
  position: relative;
  padding-block: clamp(30px, 4.5vw, 54px);
  border-top: 1px solid var(--ab-line);
}

.page-about .block:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .block__tag {
  display: inline-block;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-950);
  background: var(--cyan);
  clip-path: polygon(7px 0, 100% 0, calc(100% - 7px) 100%, 0 100%);
}

.page-about .block__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4.2vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .block__text {
  margin: 16px 0 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-dim);
}

.page-about .block__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 242, 208, 0.45);
}

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

.page-about .block__footnote {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .block__footnote a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 245, 231, 0.4);
}

.page-about .block--paper {
  margin-block: clamp(8px, 2vw, 18px);
  padding: clamp(24px, 4vw, 44px) clamp(18px, 3.4vw, 40px);
  background: var(--paper);
  color: var(--text-dark);
  border-top: 0;
  border-radius: var(--radius);
}

.page-about .block--paper .block__tag {
  background: var(--ink-900);
  color: var(--cyan);
}

.page-about .block--paper .block__title {
  color: var(--text-dark);
}

.page-about .block--paper .block__text {
  color: var(--ab-ink-soft);
}

.page-about .block--paper .block__text a {
  color: var(--ink-900);
  border-bottom-color: rgba(16, 24, 32, 0.4);
}

/* ---------- 三条主线 ---------- */
.page-about .thread-list {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .thread {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .thread__num {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .thread__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .thread__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-dim);
}

/* ---------- 版本改动 ---------- */
.page-about .shift-list {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .shift {
  padding-top: 16px;
  border-top: 2px solid rgba(61, 242, 208, 0.5);
}

.page-about .shift:nth-child(2) {
  border-top-color: rgba(143, 179, 199, 0.55);
}

.page-about .shift:nth-child(3) {
  border-top-color: rgba(255, 106, 43, 0.65);
}

.page-about .shift__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .shift__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .shift__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--paper-dim);
}

/* ---------- 标签体系 ---------- */
.page-about .tags-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 36px);
  margin-top: clamp(22px, 3vw, 30px);
  align-items: start;
}

.page-about .tags-figure {
  margin: 0;
  border: 1px solid rgba(16, 24, 32, 0.14);
  background: var(--ink-900);
}

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

.page-about .layer-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .layer {
  padding-left: 14px;
  margin-bottom: clamp(16px, 2.4vw, 22px);
  border-left: 3px solid var(--ink-900);
}

.page-about .layer:nth-child(2) {
  border-left-color: var(--tag-blue);
}

.page-about .layer:nth-child(3) {
  border-left-color: var(--orange);
}

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

.page-about .layer__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-900);
}

.page-about .layer__t {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.82;
  color: var(--ab-ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(22px, 3vw, 30px);
  align-items: start;
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid var(--ab-line);
  background: var(--ink-950);
}

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

.page-about .team-figure figcaption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--steel);
  border-top: 1px solid var(--ab-line);
}

.page-about .role-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .role {
  padding: 14px 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .role:first-child {
  padding-top: 0;
}

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

.page-about .role__name {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .role__text {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .check-strip {
  margin-top: clamp(22px, 3vw, 30px);
  padding: clamp(16px, 2.4vw, 22px);
  border-left: 3px solid var(--orange);
  background: var(--ink-950);
}

.page-about .check-strip__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .check-strip__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0 0 12px;
  padding: 0;
}

.page-about .check-strip__item {
  font-size: 14.5px;
  color: var(--paper);
}

.page-about .check-strip__n {
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--steel);
}

.page-about .check-strip__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-dim);
}

/* ---------- 栏目纵深 ---------- */
.page-about .depth-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 30px);
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .depth {
  padding-top: 14px;
  border-top: 2px solid var(--ink-900);
}

.page-about .depth__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  color: var(--text-dark);
}

.page-about .depth__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ab-ink-soft);
}

.page-about .depth__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
}

.page-about .depth__tags li {
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--paper);
  background: var(--tag-blue);
  clip-path: polygon(5px 0, 100% 0, calc(100% - 5px) 100%, 0 100%);
}

.page-about .depth__tags--file li {
  background: transparent;
  color: var(--ink-900);
  border: 1px solid rgba(16, 24, 32, 0.28);
  clip-path: none;
}

/* ---------- 覆盖 ---------- */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: reverse;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3vw, 30px);
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .reach-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-950);
}

.page-about .reach-stat b {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .reach-stat span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .reach-meter-wrap {
  grid-column: 1 / -1;
  padding: 18px 16px;
  background: var(--ink-950);
}

.page-about .reach-meter {
  display: block;
  width: 100%;
  max-width: 320px;
  height: auto;
}

.page-about .reach-meter__cap {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--paper-dim);
}

.page-about .next-row {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 30px);
  padding-top: clamp(18px, 2.6vw, 24px);
  border-top: 1px solid var(--ab-line);
}

.page-about .next-row__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .next-row__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .next-link {
  display: inline-block;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--paper);
  border: 1px solid var(--ab-line-strong);
  clip-path: polygon(9px 0, 100% 0, calc(100% - 9px) 100%, 0 100%);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

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

.page-about .next-link--primary {
  color: var(--ink-950);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .next-link--primary:hover,
.page-about .next-link--primary:focus-visible {
  color: var(--ink-950);
  background: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .next-row {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 760px) {
  .page-about .shift-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  }

  .page-about .tags-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-rail__title {
    margin-bottom: 14px;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    border-left: 1px solid var(--ab-line-strong);
  }

  .page-about .about-rail__item {
    display: block;
  }

  .page-about .about-rail__link {
    position: relative;
    margin-left: -1px;
    padding: 11px 0 11px 18px;
    white-space: normal;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -4.5px;
    top: 19px;
    width: 7px;
    height: 7px;
    background: var(--ink-900);
    border: 1px solid var(--ab-line-strong);
    transform: rotate(45deg);
    transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail__link.is-active::before,
  .page-about .about-rail__link[aria-current]::before {
    background: var(--cyan);
    border-color: var(--cyan);
  }

  .page-about .about-rail__top {
    margin-top: 20px;
    margin-left: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .next-link,
  .page-about .breadcrumb a,
  .page-about .about-rail__link::before {
    transition: none;
  }
}
<<<END>>>