.page-about {
  --about-line: rgba(16, 58, 50, 0.13);
  --about-line-soft: rgba(16, 58, 50, 0.07);
  --about-shadow: 0 16px 36px -28px rgba(16, 58, 50, 0.8);
  color: var(--text);
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, var(--about-line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-line-soft) 1px, transparent 1px);
  background-size: 96px 96px;
}

.page-about .breadcrumb {
  padding-block: 18px 10px;
  font-size: 0.82rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 6px;
  overflow: hidden;
  border-block: 1px solid rgba(184, 137, 58, 0.45);
  background:
    radial-gradient(120% 150% at 8% 0%, #1d4f42 0%, var(--ink-green) 52%, #0a2721 100%);
  color: var(--paper-bright);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(184, 137, 58, 0.15) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(184, 137, 58, 0.15) 1px, transparent 1px);
  background-size: 68px 68px;
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding-block: clamp(30px, 5vw, 64px);
}

.page-about .about-hero .eyebrow {
  color: var(--copper);
  letter-spacing: 0.22em;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.95rem, 4.6vw, 3.35rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--paper-bright);
  text-shadow: 0 2px 0 rgba(11, 39, 33, 0.6);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: clamp(0.98rem, 1.6vw, 1.06rem);
  line-height: 1.85;
  color: rgba(251, 247, 239, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid rgba(184, 137, 58, 0.42);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-dark);
  box-shadow: 0 26px 44px -32px rgba(0, 0, 0, 0.9);
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__media .media-frame__caption {
  padding: 10px 14px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: rgba(251, 247, 239, 0.66);
  border-top: 1px solid rgba(184, 137, 58, 0.28);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(22px, 3vw, 42px);
  padding-block: clamp(34px, 5vw, 68px) clamp(40px, 6vw, 80px);
}

.page-about .about-toc {
  align-self: start;
  padding: 18px 16px 20px;
  border: 1px solid var(--wood-grey);
  border-radius: var(--radius);
  background: var(--paper-bright);
  box-shadow: var(--shadow-paper, 0 14px 30px -22px rgba(21, 27, 24, 0.5));
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--copper);
}

.page-about .about-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .about-toc__link {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 8px 8px 8px 6px;
  border-left: 2px solid transparent;
  border-radius: 6px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-soft);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  background: rgba(16, 58, 50, 0.06);
  border-left-color: var(--copper);
  color: var(--ink-green);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--cinnabar);
}

.page-about .about-toc__note {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-line);
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-chapter {
  padding-block: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 108px;
}

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

.page-about .about-chapter__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--cinnabar);
}

.page-about .about-chapter h2 {
  margin: 10px 0 16px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.45rem, 2.8vw, 2rem);
  line-height: 1.3;
  color: var(--ink-green);
  padding-left: 14px;
  border-left: 4px solid var(--copper);
}

.page-about .about-chapter p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-quote {
  margin-top: 22px;
  padding: 18px 20px;
  border: 1px solid var(--wood-grey);
  border-left: 6px solid var(--cinnabar);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--paper-bright);
  box-shadow: var(--about-shadow);
}

.page-about .about-quote__text {
  margin: 10px 0 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.6;
  color: var(--ink-green);
}

/* ---------- 分工列表 ---------- */
.page-about .about-roles {
  margin: 22px 0 20px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-roles__item {
  display: grid;
  gap: 6px 20px;
  padding: 15px 4px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-roles__key {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--wood);
  padding-top: 2px;
}

.page-about .about-roles__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 22px 0;
  border: 1px solid var(--wood-grey);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-bright);
  box-shadow: var(--shadow-paper, 0 14px 30px -22px rgba(21, 27, 24, 0.5));
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure .media-frame__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--about-line);
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 26px 0 4px;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--copper) 0%, rgba(184, 137, 58, 0.18) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 14px 34px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 14px;
  width: 13px;
  height: 13px;
  background: var(--paper-bright);
  border: 2px solid var(--copper);
  border-radius: 2px;
  transform: rotate(45deg);
}

.page-about .about-timeline__detail {
  border: 1px solid var(--wood-grey);
  border-radius: 12px;
  background: var(--paper-bright);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-timeline__detail[open] {
  border-color: var(--copper);
  box-shadow: var(--about-shadow);
}

.page-about .about-timeline__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--ink-green);
}

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

.page-about .about-timeline__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--copper);
}

.page-about .about-timeline__detail[open] .about-timeline__summary::after {
  content: "–";
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--cinnabar);
}

.page-about .about-timeline__body {
  margin: 0;
  padding: 0 14px 14px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-soft);
  border-top: 1px dashed var(--about-line);
  padding-top: 12px;
}

/* ---------- 团队数据条 ---------- */
.page-about .about-facts {
  display: grid;
  gap: 1px;
  margin-top: 24px;
  background: var(--about-line);
  border: 1px solid var(--wood-grey);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  background: var(--paper-bright);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.1;
  color: var(--ink-green);
}

.page-about .about-fact__label {
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 准则 ---------- */
.page-about .about-pledge {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-pledge__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 16px 18px;
  border: 1px solid var(--wood-grey);
  border-radius: var(--radius);
  background: var(--paper-bright);
  box-shadow: var(--about-shadow);
}

.page-about .about-pledge__num {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1.3;
  color: var(--copper);
}

.page-about .about-pledge__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--ink-green);
}

.page-about .about-pledge__body p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--text-soft);
}

/* ---------- 结尾行动条 ---------- */
.page-about .about-cta {
  margin-top: 30px;
  display: grid;
  gap: 18px;
  padding: clamp(22px, 3.4vw, 32px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(184, 137, 58, 0.4);
  background:
    linear-gradient(135deg, var(--green-light) 0%, var(--ink-green) 62%, #0b2a24 100%);
  color: var(--paper-bright);
}

.page-about .about-cta__text h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  line-height: 1.45;
  color: var(--paper-bright);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 52ch;
  font-size: 0.93rem;
  line-height: 1.8;
  color: rgba(251, 247, 239, 0.78);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-roles__item {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-pledge__item {
    grid-template-columns: 52px minmax(0, 1fr);
    padding: 20px 22px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 244px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
  }
}

@media (max-width: 520px) {
  .page-about .about-chapter h2 {
    padding-left: 10px;
    border-left-width: 3px;
  }

  .page-about .about-timeline__item {
    padding-left: 28px;
  }

  .page-about .about-pledge__item {
    grid-template-columns: minmax(0, 1fr);
    padding: 16px;
  }

  .page-about .about-pledge__num {
    font-size: 1rem;
  }
}

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