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

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) 0 clamp(36px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(110% 90% at 88% 0%, rgba(198, 255, 74, 0.09), transparent 58%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(36, 74, 61, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 74, 61, 0.42) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(92% 82% at 50% 0%, #000 18%, transparent 76%);
  mask-image: radial-gradient(92% 82% at 50% 0%, #000 18%, transparent 76%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
  outline: none;
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--slate);
}

.page-about .about-hero__title {
  margin: 12px 0 20px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 56ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px;
  background: var(--ink-800);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.1;
  color: var(--lime);
}

.page-about .about-hero__lbl {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ===== 双栏骨架 ===== */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 36px);
  padding: clamp(28px, 5vw, 64px) 0 clamp(48px, 7vw, 96px);
}

/* ===== 左侧索引 ===== */
.page-about .about-index {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--ink-800);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  background: var(--lime-soft);
  outline: none;
}

/* ===== 章节通用 ===== */
.page-about .about-section {
  padding: clamp(26px, 4vw, 44px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 90px;
}

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

.page-about .about-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-section__no {
  flex: none;
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-900);
  background: var(--lime);
  border-radius: var(--about-radius);
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(21px, 2.9vw, 30px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-prose p {
  margin: 0 0 14px;
  font-size: clamp(14.5px, 1.5vw, 16px);
  line-height: 1.95;
  color: var(--muted);
}

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

.page-about .about-callout {
  margin-top: 22px;
  padding: 14px 16px;
  border-left: 2px solid var(--orange);
  background: var(--orange-soft);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
}

.page-about .about-callout__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--paper);
}

/* ===== 版本时间轴 ===== */
.page-about .about-versionbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 22px 0 0;
}

.page-about .about-versionbar__note {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .vtl {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(232px, 1fr);
  gap: 14px;
  margin: 22px 0 0;
  padding: 10px 0 14px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .vtl__card {
  position: relative;
  min-width: 0;
  padding: 20px 16px 20px;
  scroll-snap-align: start;
  border: 1px solid var(--line);
  border-top: 2px solid var(--orange);
  border-radius: var(--about-radius);
  background: var(--ink-800);
}

.page-about .vtl__card--current {
  border-top-color: var(--lime);
  background: linear-gradient(180deg, var(--lime-soft), var(--ink-800) 62%);
}

.page-about .vtl__dot {
  position: absolute;
  top: -6px;
  left: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px var(--orange-soft);
}

.page-about .vtl__card--current .vtl__dot {
  background: var(--lime);
  box-shadow: 0 0 0 4px var(--lime-soft);
}

.page-about .vtl__ver {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .vtl__card--current .vtl__ver {
  color: var(--lime);
}

.page-about .vtl__title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .vtl__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ===== 分类体系 ===== */
.page-about .about-taxonomy__media {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-taxonomy__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .cat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cat-grid__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--slate);
  border-radius: var(--about-radius);
  background: var(--ink-800);
}

.page-about .cat-grid__item--accent {
  border-left-color: var(--orange);
}

.page-about .cat-grid__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .cat-grid__meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--slate);
}

/* ===== 团队数字与流程 ===== */
.page-about .figure-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--line);
  overflow: hidden;
}

.page-about .figure-row__cell {
  padding: 18px 16px;
  background: var(--ink-800);
}

.page-about .figure-row__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1;
  color: var(--lime);
}

.page-about .figure-row__lbl {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__item {
  padding: 14px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--slate);
  border-radius: var(--about-radius);
  background: var(--ink-700);
}

.page-about .flow__step {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .flow__name {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
}

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

.page-about .about-team__media {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

/* ===== 合作标签云 ===== */
.page-about .cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cloud__tag {
  position: relative;
  padding: 7px 13px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--paper);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .cloud__tag:hover {
  color: var(--lime);
  border-color: var(--lime);
  background: var(--lime-soft);
}

.page-about .cloud__tag::after {
  content: attr(data-note);
  position: absolute;
  left: 0;
  top: calc(100% + 8px);
  z-index: 30;
  width: max-content;
  max-width: 240px;
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-900);
  background: var(--cream);
  border-radius: var(--about-radius);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.page-about .cloud__tag:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ===== 联系 ===== */
.page-about .contact-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 20px;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--ink-800);
}

.page-about .contact-card::before,
.page-about .contact-card::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--lime);
  opacity: 0.55;
}

.page-about .contact-card::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .contact-card::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
}

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

.page-about .contact-list__key {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .contact-list__val {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
  text-decoration: none;
}

.page-about a.contact-list__val:hover,
.page-about a.contact-list__val:focus-visible {
  color: var(--lime);
  outline: none;
}

.page-about .contact-card__tip {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.page-about .contact-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 14px 0 0;
}

/* ===== 响应式 ===== */
@media (min-width: 600px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .contact-card {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }

  .page-about .about-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 88px;
    padding: 0 0 0 18px;
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list li + li {
    margin-top: 2px;
  }

  .page-about .about-index__link {
    width: 100%;
    margin-left: -18px;
    padding: 9px 0 9px 16px;
    white-space: normal;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--lime);
    background: var(--lime-soft);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .cloud__tag,
  .page-about .cloud__tag::after,
  .page-about .breadcrumb a {
    transition: none;
  }
}
<<<END>>>