.page-about {
  --about-line: var(--grid);
  background: var(--ink);
  color: var(--text-dim);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.2vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
  margin: 8px 0 0;
}

.page-about .about-h3 {
  font-family: var(--font-display);
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 22px 0 8px;
}

.page-about .about-section-head {
  max-width: 760px;
  margin-bottom: clamp(20px, 3.6vw, 40px);
}

.page-about .about-section-head__sub {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.page-about p {
  line-height: 1.85;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 48px) 0 clamp(40px, 7vw, 88px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  top: 8%;
  width: 62%;
  height: 74%;
  background: linear-gradient(155deg, rgba(0, 245, 212, 0.09), rgba(110, 90, 168, 0.06) 48%, transparent 72%);
  transform: skewY(-3deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(30px, 7.4vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: var(--paper);
  margin: 14px 0 0;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 56ch;
  color: var(--text-dim);
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.85;
}

.page-about .about-hero__aside {
  display: grid;
  gap: 18px;
  align-content: end;
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 18px;
  border-top: 1px solid var(--about-line);
  padding-top: 12px;
}

.page-about .about-index__link {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-decoration: none;
  padding: 5px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.22s ease, border-color 0.22s ease;
}

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

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

.page-about .about-metric {
  background: var(--panel);
  padding: 14px 12px 16px;
}

.page-about .about-metric__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: -0.01em;
}

.page-about .about-metric__label {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin__figure {
  margin: 0 0 clamp(24px, 4vw, 44px);
}

.page-about .about-origin__body {
  align-items: start;
}

.page-about .about-quote {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(19px, 2.6vw, 27px);
  line-height: 1.55;
  color: var(--paper);
  border-left: 2px solid var(--cyan);
  padding-left: 16px;
}

.page-about .about-quote__cite {
  display: block;
  margin-top: 14px;
  font-family: var(--font-body);
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

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

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

.page-about .about-inline-links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-inline-links a:hover,
.page-about .about-inline-links a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 内容方法 ---------- */
.page-about .about-method {
  border-top: 1px solid var(--about-line);
}

.page-about .about-method__grid {
  align-items: start;
}

.page-about .about-rail {
  border: 1px solid var(--about-line);
  background: var(--panel);
  padding: 18px 16px 20px;
  position: relative;
}

.page-about .about-rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 44px;
  background: var(--violet);
}

.page-about .about-rail__label {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--violet);
  filter: brightness(1.5);
}

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

.page-about .about-rail__item {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 8px;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.06em;
  padding-top: 3px;
}

.page-about .about-method__body > p {
  margin: 14px 0 0;
}

.page-about .about-method__figure {
  margin: clamp(20px, 3.4vw, 32px) 0 8px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  border-top: 1px solid var(--about-line);
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-role {
  background: var(--ink);
  padding: 20px 18px 22px;
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  background: var(--panel);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.page-about .about-role__count {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .about-role__title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--paper);
  margin: 10px 0 0;
}

.page-about .about-role__duty {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  transition: color 0.25s ease;
}

.page-about .about-role:hover .about-role__duty {
  color: var(--text-dim);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-sec {
  border-top: 1px solid var(--about-line);
}

.page-about .about-timeline__layout {
  align-items: start;
}

.page-about .about-timeline__figure {
  margin: 0 0 clamp(24px, 4vw, 0);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 16px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 58%, var(--about-line));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 14px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -3.5px;
  top: 6px;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-timeline__content .about-h3 {
  margin-top: 6px;
}

.page-about .about-timeline__content p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-version {
  margin-top: 12px;
  border: 1px solid var(--about-line);
  background: var(--panel);
}

.page-about .about-version summary {
  cursor: pointer;
  padding: 9px 12px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  list-style: none;
}

.page-about .about-version summary::-webkit-details-marker {
  display: none;
}

.page-about .about-version summary::before {
  content: "+ ";
  font-family: var(--font-mono);
  color: var(--muted);
}

.page-about .about-version[open] summary::before {
  content: "− ";
  color: var(--cyan);
}

.page-about .about-version__body {
  padding: 0 12px 12px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-version__body p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 合作与服务（纸面） ---------- */
.page-about .about-eco {
  color: var(--ink);
}

.page-about .about-eco .about-h2,
.page-about .about-eco .about-h3 {
  color: var(--ink);
}

.page-about .about-eco .eyebrow {
  color: var(--wine);
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 28px);
}

.page-about .about-eco__card {
  border: 1px solid var(--line-soft);
  border-top: 3px solid var(--ink);
  padding: 20px 18px 22px;
  background: rgba(255, 255, 255, 0.34);
}

.page-about .about-eco__card .about-h3 {
  margin-top: 0;
}

.page-about .about-eco__card p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: #2A3B35;
}

.page-about .about-eco__card a {
  color: var(--wine);
  text-decoration: none;
  border-bottom: 1px solid var(--wine);
  word-break: break-all;
}

.page-about .about-eco__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #4A5A54;
}

.page-about .about-eco__links {
  margin: clamp(18px, 3vw, 28px) 0 0;
  font-size: 13px;
  color: #2A3B35;
}

.page-about .about-eco__links a {
  color: var(--wine);
  text-decoration: none;
  border-bottom: 1px solid var(--wine);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--about-line);
  background: linear-gradient(140deg, var(--panel), var(--ink) 62%);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: center;
}

.page-about .about-cta__title {
  margin-top: 0;
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 52ch;
  color: var(--muted);
  font-size: 14px;
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-metric {
    padding: 18px 16px 20px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(32px, 4vw, 64px);
  }

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

  .page-about .about-origin__figure {
    clip-path: polygon(0 0, 100% 1.6%, 100% 100%, 0 98.4%);
  }

  .page-about .about-method__grid {
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-method__figure {
    max-width: 74%;
    margin-left: auto;
  }

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

  .page-about .about-timeline__figure {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    margin-bottom: 0;
  }

  .page-about .about-timeline {
    padding-left: 26px;
  }

  .page-about .about-timeline__item {
    padding-left: 20px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    justify-content: space-between;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__aside {
    gap: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-role,
  .page-about .about-role__duty {
    transition-duration: 0.01ms;
  }
}
<<<END>>>