.page-about {
  --about-toc-w: 196px;
  --about-grain: rgba(63, 224, 200, 0.06);
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-topline {
  padding-top: 18px;
  padding-bottom: 10px;
}

.page-about .about-topline .breadcrumbs {
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 18px 0 52px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--pine);
  clip-path: polygon(0 68%, 100% 46%, 100% 100%, 0 100%);
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--about-grain) 1px, transparent 1px);
  background-size: 6px 6px;
  opacity: 0.6;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--paper-warm);
  margin: 14px 0 16px;
  max-width: 16ch;
}

.page-about .about-hero__intro {
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 54ch;
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-hero__data {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 31, 26, 0.72);
  padding: 16px;
}

.page-about .about-spark {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 14px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--ink);
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 6vw, 34px);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 0;
  padding-bottom: 40px;
}

.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 6;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
  padding: 8px 0 6px;
  margin-bottom: 4px;
}

.page-about .about-toc__title {
  display: none;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--mist);
  text-decoration: none;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc__link span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--clay);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--paper-warm);
  border-color: var(--cyan);
  outline: none;
}

.page-about .about-chapter {
  padding: 36px 0 44px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 72px;
}

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

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--clay);
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-chapter__num::after {
  content: "";
  flex: 0 0 34px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-chapter h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 5.4vw, 42px);
  line-height: 1.14;
  color: var(--paper-warm);
  margin: 0 0 18px;
  max-width: 20ch;
}

.page-about .about-chapter__body p,
.page-about .about-lead,
.page-about .about-after {
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-chapter__body p {
  margin: 0 0 16px;
}

.page-about .about-lead {
  margin: 0 0 22px;
}

.page-about .about-after {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--cyan);
}

.page-about .measure {
  max-width: 64ch;
}

/* ---------- 奶油纸面板 ---------- */
.page-about .about-paper {
  background: var(--paper);
  color: var(--coal);
  border-radius: var(--radius);
  padding: clamp(20px, 3.4vw, 34px);
  box-shadow: var(--shadow);
}

.page-about .about-pull {
  margin-top: 26px;
  position: relative;
}

.page-about .about-pull::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--clay);
  border-radius: var(--radius) 0 0 var(--radius);
}

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

.page-about .about-pull__text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 3.6vw, 26px);
  line-height: 1.42;
  margin: 0 0 14px;
  max-width: 26ch;
}

.page-about .about-pull__link {
  font-size: 14px;
  color: var(--coal);
  text-decoration: none;
  border-bottom: 1px solid var(--clay);
  padding-bottom: 2px;
}

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

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0 0 24px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius);
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 四步流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-steps li {
  background: var(--ink);
  padding: 18px 16px;
}

.page-about .about-steps__n {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--cyan);
  display: block;
  margin-bottom: 8px;
}

.page-about .about-steps h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--paper-warm);
  margin: 0 0 8px;
}

.page-about .about-steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-note {
  margin-top: 20px;
  padding: 16px 18px;
  background: var(--pine);
  border-left: 2px solid var(--clay);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-note__title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--clay-soft);
  margin: 0 0 8px;
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 三条能力线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 12px;
}

.page-about .about-line {
  border: 1px solid var(--line);
  background: var(--pine);
  border-radius: var(--radius);
  padding: 16px 16px 12px;
}

.page-about .about-line h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--paper-warm);
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-line li {
  position: relative;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  padding: 6px 0 6px 14px;
}

.page-about .about-line li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 22px;
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-role {
  background: var(--paper);
  color: var(--coal);
  border-radius: var(--radius);
  padding: 14px 14px 16px;
  box-shadow: var(--shadow);
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 28px;
  line-height: 1;
  color: var(--teal);
  display: block;
  margin-bottom: 6px;
}

.page-about .about-role h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  margin: 0 0 6px;
}

.page-about .about-role p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-wrap {
  display: grid;
  gap: 24px;
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(var(--cyan), var(--line) 82%);
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: 22px;
}

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

.page-about .about-tl__dot {
  position: absolute;
  left: -26px;
  top: 5px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-tl__item:hover .about-tl__dot {
  background: var(--clay);
  border-color: var(--clay);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  display: block;
  margin-bottom: 4px;
}

.page-about .about-tl__item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper-warm);
  margin: 0 0 4px;
}

.page-about .about-tl__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.page-about .about-tl__item:hover .about-tl__note {
  color: var(--paper);
}

.page-about .about-figure--tall img {
  aspect-ratio: 4 / 5;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-scope {
  display: grid;
  gap: 20px;
}

.page-about .about-scope__data {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-mini {
  background: var(--ink);
  padding: 14px 16px;
  display: grid;
  gap: 4px;
}

.page-about .about-mini__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 22px;
  color: var(--cyan);
  line-height: 1.2;
}

.page-about .about-mini__label {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-contact-card p {
  font-size: 14.5px;
  line-height: 1.85;
  margin: 0 0 12px;
  max-width: 46ch;
}

.page-about .about-contact-card__mail {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--coal) !important;
  word-break: break-all;
  border-bottom: 1px solid var(--paper-shadow);
  padding-bottom: 8px;
}

.page-about .about-contact-card__meta {
  font-size: 12.5px !important;
  color: #4a4038 !important;
}

.page-about .about-contact-card .btn {
  margin-top: 4px;
}

/* ---------- 结尾 ---------- */
.page-about .about-chapter--last {
  border-top: 1px solid var(--line);
  position: relative;
  padding-bottom: 20px;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 26px 0 64px;
  }

  .page-about .about-hero::before {
    clip-path: polygon(58% 0, 100% 0, 100% 100%, 40% 100%);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 36px;
    align-items: end;
  }

  .page-about .about-hero__data {
    padding: 20px;
  }

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

  .page-about .about-steps li {
    padding: 22px 20px;
  }

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

  .page-about .about-figure {
    margin-bottom: 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-toc {
    top: 24px;
    background: transparent;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 4px 0 4px 14px;
    margin-bottom: 0;
  }

  .page-about .about-toc__title {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--clay);
    margin: 0 0 12px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-toc__link {
    border: 0;
    padding: 7px 0;
    font-size: 13px;
    border-radius: 0;
    white-space: normal;
    line-height: 1.5;
  }

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

  .page-about .about-chapter {
    padding: 48px 0 56px;
    scroll-margin-top: 32px;
  }

  .page-about .about-chapter:first-child {
    padding-top: 8px;
  }

  .page-about .about-pull {
    margin-left: -28px;
    max-width: 60ch;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
    gap: 26px;
  }

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

  .page-about .about-timeline-wrap {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
    gap: 32px;
  }

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

  .page-about .about-scope {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 24px;
  }

  .page-about .about-mini {
    padding: 16px 18px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-lines {
    gap: 16px;
  }

  .page-about .about-line {
    padding: 20px 20px 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-tl__dot,
  .page-about .about-tl__note {
    transition: none;
  }
}
<<<END>>>