.page-about {
  --body-size: 16px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sage);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5em;
  color: var(--pine);
}

.page-about:has(#ts-m:checked) {
  --body-size: 18px;
}

.page-about:has(#ts-l:checked) {
  --body-size: 20px;
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
  padding-block: clamp(28px, 5vw, 56px) clamp(36px, 6vw, 72px);
}

.page-about .about-hero__tag {
  display: inline-block;
  margin-bottom: clamp(14px, 2.4vw, 24px);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 72px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--fog);
  text-wrap: balance;
  max-width: 17ch;
}

.page-about .about-hero .lede {
  max-width: 40ch;
  color: var(--mist);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-soft);
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 8;
  object-fit: cover;
}

/* 工具条：字号调节 + 章节说明牌 */
.page-about .about-toolbar {
  display: grid;
  gap: 6px;
  border-top: 1px solid var(--pine);
  border-bottom: 1px solid var(--pine);
  padding-block: 12px;
}

.page-about .about-typebar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-about .ts-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sage);
  margin-right: 4px;
}

.page-about .ts-btn {
  display: inline-block;
  padding: 5px 14px;
  border: 1px solid var(--pine);
  border-radius: 999px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--mist);
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .ts-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-ts:checked + .ts-btn {
  background: var(--pulse);
  border-color: var(--pulse);
  color: var(--ink);
}

.page-about .about-ts:focus-visible + .ts-btn {
  outline: 3px solid var(--pulse);
  outline-offset: 2px;
}

.page-about .about-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-block: 6px 2px;
  scrollbar-width: thin;
}

.page-about .about-index .index-link {
  flex: 0 0 auto;
  padding: 6px 12px;
  border: 1px solid var(--pine);
  border-radius: 999px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-index .index-link b {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  margin-right: 6px;
  letter-spacing: 0.06em;
}

.page-about .about-index .index-link:hover {
  background: var(--pulse);
  border-color: var(--pulse);
  color: var(--ink);
}

.page-about .about-index .index-link:hover b {
  color: var(--ink);
}

/* 概况数字 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-block: clamp(28px, 4vw, 48px);
  background: var(--pine);
  border: 1px solid var(--pine);
  border-radius: var(--radius-hard);
  overflow: hidden;
}

.page-about .stat {
  background: var(--ink-2);
  padding: clamp(16px, 3vw, 26px);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .stat--pulse .stat-num {
  color: var(--pulse);
}

.page-about .stat-label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--sage);
  letter-spacing: 0.04em;
}

/* 章节骨架：左侧刻度 + 右侧内容 */
.page-about .about-sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  padding-block: clamp(36px, 5.5vw, 68px);
  border-top: 1px solid var(--pine);
}

.page-about .sec-mark {
  position: relative;
  padding-left: 18px;
}

.page-about .sec-mark::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--pine) 70%);
}

.page-about .sec-mark::after {
  content: "";
  position: absolute;
  left: -3px;
  top: 4px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 240, 196, 0.14);
}

.page-about .sec-body h2 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  color: var(--fog);
  margin: 0 0 clamp(14px, 2.2vw, 20px);
}

.page-about .about-lead {
  max-width: 46ch;
  margin: 0 0 clamp(20px, 3vw, 32px);
  color: var(--mist);
  font-size: var(--body-size);
  line-height: 1.75;
}

.page-about .about-prose {
  font-size: var(--body-size);
  line-height: 1.8;
  color: var(--sage);
}

.page-about .about-prose p {
  font-size: inherit;
  max-width: 38em;
}

.page-about .about-prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--pine);
  transition: border-color 0.18s var(--ease), border-width 0.18s var(--ease);
}

.page-about .about-prose a:hover {
  border-bottom: 2px solid var(--cyan);
}

.page-about .about-quote {
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding-left: clamp(16px, 3vw, 28px);
  border-left: 3px solid var(--pulse);
  font-family: var(--font-serif);
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.5;
  color: var(--mist);
  font-weight: 300;
}

.page-about .about-quote p {
  margin: 0;
}

/* 版本带 */
.page-about .about-band {
  background: var(--ink-2);
  border-top: 1px solid var(--pine);
  border-bottom: 1px solid var(--pine);
}

.page-about .about-sec--band {
  border-top: none;
}

.page-about .about-band__fig {
  margin: 0 0 clamp(22px, 4vw, 38px) auto;
  max-width: 460px;
  border-radius: var(--radius-hard);
  overflow: hidden;
}

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

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

.page-about .tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding-block: clamp(18px, 3vw, 28px);
  border-top: 1px solid var(--pine);
}

.page-about .tl-item:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .tl-year {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: clamp(38px, 7.4vw, 84px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--mist);
  font-weight: 300;
}

.page-about .tl-dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 0.32em;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(43, 240, 196, 0.12);
}

.page-about .tl-item--now .tl-year {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5.4vw, 60px);
  color: var(--pulse);
}

.page-about .tl-item--now .tl-dot {
  background: var(--pulse);
  box-shadow: 0 0 0 5px rgba(255, 90, 31, 0.16);
}

.page-about .tl-main h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 22px);
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .tl-main p {
  margin: 0 0 8px;
  max-width: 52ch;
  font-size: var(--body-size);
  line-height: 1.75;
  color: var(--sage);
}

.page-about .tl-note {
  color: var(--cyan);
  border-left: 2px solid var(--pine);
  padding-left: 12px;
  max-height: none;
  opacity: 1;
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
}

.page-about .team-col {
  border-top: 2px solid var(--pine);
  padding-top: 16px;
}

.page-about .team-col--key {
  border-top-color: var(--pulse);
}

.page-about .team-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .team-name {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1;
  color: var(--pulse);
}

.page-about .team-col p {
  margin: 0;
  font-size: var(--body-size);
  line-height: 1.75;
  color: var(--sage);
}

/* 工序 */
.page-about .about-fig {
  margin: 0 0 clamp(22px, 3.5vw, 34px);
  border-radius: var(--radius-soft);
  overflow: hidden;
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 3vw, 28px);
}

.page-about .flow-step {
  border-left: 2px solid var(--pine);
  padding-left: clamp(14px, 2.4vw, 20px);
  transition: border-color 0.18s var(--ease);
}

.page-about .flow-step:hover {
  border-left-color: var(--cyan);
}

.page-about .flow-step--key {
  border-left-color: var(--pulse);
}

.page-about .flow-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .flow-step--key .flow-idx {
  color: var(--pulse);
}

.page-about .flow-step h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  color: var(--fog);
}

.page-about .flow-step p {
  margin: 0;
  font-size: var(--body-size);
  line-height: 1.75;
  color: var(--sage);
}

/* 合作与资质 */
.page-about .partner-row {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(16px, 3vw, 40px);
  margin-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--pine);
  padding-top: clamp(16px, 2.6vw, 24px);
}

.page-about .partner-item {
  flex: 1 1 150px;
}

.page-about .partner-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  color: var(--volt);
}

.page-about .partner-key {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--sage);
  letter-spacing: 0.04em;
}

.page-about .about-cta {
  margin-top: clamp(22px, 3.4vw, 32px);
}

/* 继续浏览 */
.page-about .next-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-block: clamp(32px, 5vw, 56px) clamp(40px, 6vw, 72px);
  background: var(--pine);
  border: 1px solid var(--pine);
  border-radius: var(--radius-hard);
  overflow: hidden;
}

.page-about .next-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: clamp(16px, 2.8vw, 24px);
  background: var(--ink);
  color: var(--fog);
  text-decoration: none;
  font-size: 15px;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .next-link:hover {
  background: var(--pulse);
  color: var(--ink);
}

.page-about .next-arrow {
  font-family: var(--font-mono);
  font-size: 18px;
}

.page-about .next-link:focus-visible {
  outline: 3px solid var(--pulse);
  outline-offset: -3px;
}

@media (min-width: 760px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
  }

  .page-about .about-sec {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(24px, 5vw, 64px);
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-grid {
    grid-template-columns: 1.35fr 1fr 0.9fr;
  }

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

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

@media (min-width: 820px) {
  .page-about .tl-item {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 0 32px;
    align-items: start;
  }

  .page-about .tl-note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding-left: 0;
    border-left-color: transparent;
    transition: max-height 0.3s var(--ease), opacity 0.3s var(--ease), padding-left 0.3s var(--ease);
  }

  .page-about .tl-item:hover .tl-note,
  .page-about .tl-item:focus-within .tl-note {
    max-height: 8em;
    opacity: 1;
    padding-left: 12px;
    border-left-color: var(--pine);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.001ms !important;
  }
}
<<<END>>>