.page-about {
  background: var(--paper-100);
  color: var(--brown);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: var(--paper-100);
  padding: 28px 0 52px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 5.4vw, 62px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 14px 0 20px;
  padding-left: 18px;
  border-left: 4px solid var(--lime);
}

.page-about .about-hero__intro {
  max-width: 46rem;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(31, 23, 16, 0.82);
  margin: 0;
}

.page-about .about-imprint {
  background: var(--paper-200);
  border: 1px solid var(--line-cool);
  border-radius: var(--r-lg);
  padding: 22px 24px 24px;
}

.page-about .about-imprint__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .imprint-list {
  margin: 12px 0 0;
  padding: 0;
}

.page-about .imprint-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-cool);
}

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

.page-about .imprint-row dt {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(31, 23, 16, 0.62);
}

.page-about .imprint-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 19px;
  line-height: 1.2;
  color: var(--ink-800);
}

/* ---------- 通用章节容器 ---------- */
.page-about .about-block {
  background: var(--paper-100);
  padding: 52px 0;
}

.page-about .about-block--track {
  background: var(--paper-100);
  padding-bottom: 60px;
}

.page-about .about-block--partner {
  padding-bottom: 72px;
}

/* ---------- 三类工作 ---------- */
.page-about .work-list {
  margin-top: 30px;
  border-top: 1px solid var(--line-cool);
}

.page-about .work-row {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-cool);
}

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

.page-about .work-row__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
}

.page-about .work-row__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(31, 23, 16, 0.78);
}

/* ---------- 时间轴 ---------- */
.page-about .about-track {
  position: relative;
  margin-top: 30px;
  padding-left: 26px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime-dim), var(--line-cool));
}

.page-about .track-node {
  position: relative;
  padding: 0 0 26px;
}

.page-about .track-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--steel);
  background: var(--paper-100);
  box-sizing: border-box;
}

.page-about .track-node--now::before,
.page-about .track-node[open]::before {
  background: var(--lime);
  border-color: var(--lime-dim);
}

.page-about .track-node > summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding-right: 26px;
}

.page-about .track-node > summary::-webkit-details-marker {
  display: none;
}

.page-about .track-node > summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--lime-dim);
}

.page-about .track-node[open] > summary::after {
  content: "−";
  color: var(--orange);
}

.page-about .track-node__stage {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
  margin-bottom: 4px;
}

.page-about .track-node__title {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .track-node__brief {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(31, 23, 16, 0.72);
}

.page-about .track-node__body {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(31, 23, 16, 0.8);
  padding: 14px 16px;
  background: var(--paper-200);
  border-radius: var(--r-sm);
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.page-about .team-notes {
  display: grid;
  gap: 18px;
}

.page-about .team-note {
  padding: 18px 0 0;
  border-top: 1px solid var(--line-cool);
}

.page-about .team-note__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}

.page-about .team-note__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(31, 23, 16, 0.8);
}

.page-about .team-note__desc a {
  color: var(--ink-800);
  text-decoration: underline;
  text-decoration-color: var(--lime-dim);
  text-underline-offset: 3px;
}

.page-about .team-note__desc a:hover {
  color: var(--orange);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  border-radius: var(--r-lg);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(31, 23, 16, 0.6);
}

.page-about .about-figure--team img {
  aspect-ratio: 4 / 3;
}

/* ---------- 深色流程带 ---------- */
.page-about .about-flow {
  position: relative;
  background: var(--ink-900);
  color: var(--paper-100);
  padding-bottom: 68px;
}

.page-about .flow-cover {
  position: relative;
  line-height: 0;
}

.page-about .flow-cover img {
  display: block;
  width: 100%;
  height: clamp(160px, 26vw, 320px);
  object-fit: cover;
}

.page-about .flow-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 35, 28, 0.2) 0%, rgba(6, 35, 28, 0.82) 62%, var(--ink-900) 100%);
}

.page-about .about-flow .wrap {
  position: relative;
  padding-top: 30px;
}

.page-about .about-flow .chapter-num {
  color: var(--orange);
}

.page-about .about-flow .chapter-title {
  color: var(--paper-100);
}

.page-about .about-flow .chapter-lead {
  color: rgba(244, 237, 221, 0.72);
}

.page-about .flow-steps {
  display: grid;
  gap: 0;
  margin-top: 34px;
  border-top: 1px solid var(--line-dark);
}

.page-about .flow-step {
  border-bottom: 1px solid var(--line-dark);
  padding: 22px 0;
}

.page-about .flow-step > summary {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 24px;
}

.page-about .flow-step > summary::-webkit-details-marker {
  display: none;
}

.page-about .flow-step > summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--lime);
}

.page-about .flow-step[open] > summary::after {
  content: "−";
  color: var(--orange);
}

.page-about .step-ring-wrap {
  display: block;
  width: 56px;
  height: 56px;
}

.page-about .step-ring {
  display: block;
  width: 56px;
  height: 56px;
  color: var(--lime);
}

.page-about .step-ring__num {
  font-family: var(--font-mono);
  font-size: 17px;
  fill: var(--lime);
}

.page-about .flow-step__text {
  display: grid;
  gap: 2px;
}

.page-about .flow-step__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .flow-step__title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper-100);
}

.page-about .flow-step__brief {
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 237, 221, 0.7);
  margin-top: 2px;
}

.page-about .flow-step__body {
  margin: 14px 0 0 72px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 237, 221, 0.82);
  padding: 14px 16px;
  border-radius: var(--r-sm);
  background: rgba(185, 255, 61, 0.06);
  border: 1px solid var(--line-dark);
}

.page-about .about-figure--flow {
  margin-top: 36px;
}

.page-about .about-figure--flow img {
  aspect-ratio: 12 / 7;
  border: 1px solid var(--line-dark);
}

.page-about .about-figure--flow figcaption {
  color: rgba(244, 237, 221, 0.6);
}

/* ---------- 内容产出 ---------- */
.page-about .output-split {
  display: grid;
  gap: 26px;
  margin-top: 30px;
}

.page-about .output-figure {
  padding: 22px 0 0;
  border-top: 3px solid var(--lime);
}

.page-about .output-figure__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(54px, 9vw, 92px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink-800);
  letter-spacing: -0.02em;
}

.page-about .output-figure__label {
  margin: 8px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(31, 23, 16, 0.66);
}

.page-about .output-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-cool);
}

.page-about .output-list li {
  position: relative;
  padding: 15px 0 15px 18px;
  border-bottom: 1px solid var(--line-cool);
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(31, 23, 16, 0.8);
}

.page-about .output-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 25px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .output-list a {
  color: var(--ink-800);
  text-decoration: underline;
  text-decoration-color: var(--lime-dim);
  text-underline-offset: 3px;
}

.page-about .output-list a:hover {
  color: var(--orange);
}

/* ---------- 合作场景 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .partner-card {
  background: var(--paper-200);
  border: 1px solid var(--line-cool);
  border-radius: var(--r-lg);
  padding: 24px 22px 26px;
}

.page-about .partner-card__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .partner-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .partner-card__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(31, 23, 16, 0.78);
}

.page-about .partner-open {
  margin-top: 22px;
  padding: 18px 20px;
  border: 1px dashed var(--lime-dim);
  border-radius: var(--r-md);
}

.page-about .partner-open p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(31, 23, 16, 0.8);
}

.page-about .partner-open a {
  color: var(--ink-800);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

.page-about .partner-open a:hover {
  color: var(--orange);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background: var(--paper-100);
  padding: 12px 0 96px;
}

.page-about .about-cta__inner {
  padding-top: 36px;
  border-top: 1px solid var(--line-cool);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-cta__desc {
  max-width: 40rem;
  margin: 0 0 22px;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(31, 23, 16, 0.76);
}

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

/* ---------- 交互与动效 ---------- */
.page-about .track-node > summary:focus-visible,
.page-about .flow-step > summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
  border-radius: 4px;
}

.page-about a:focus-visible,
.page-about .btn:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }

  .page-about [data-reveal].is-revealed {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 36px 0 62px;
  }

  .page-about .about-block {
    padding: 66px 0;
  }

  .page-about .work-row {
    grid-template-columns: 56px minmax(0, 200px) minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
    padding: 24px 0;
  }

  .page-about .work-row__num {
    padding-top: 4px;
  }

  .page-about .about-track {
    padding-left: 40px;
  }

  .page-about .about-track::before {
    left: 9px;
  }

  .page-about .track-node {
    padding-bottom: 30px;
  }

  .page-about .track-node::before {
    left: -38px;
    width: 14px;
    height: 14px;
  }

  .page-about .track-node__title {
    font-size: 21px;
  }

  .page-about .partner-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 18px;
  }

  .page-about .partner-card:first-child {
    grid-row: span 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about .output-list li {
    font-size: 16px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(250px, 0.5fr);
    gap: 52px;
    align-items: end;
    margin-top: 34px;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .output-split {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1.38fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-flow {
    padding-bottom: 84px;
  }

  .page-about .about-flow .wrap {
    padding-top: 40px;
  }

  .page-about .flow-step {
    padding: 26px 0;
  }

  .page-about .flow-step__title {
    font-size: 22px;
  }

  .page-about .flow-step__body {
    margin-left: 72px;
    font-size: 15px;
  }
}
<<<END>>>