.page-about {
  --about-pad: clamp(48px, 7vw, 96px);
  --about-rule: rgba(16, 33, 28, 0.14);
  background: var(--warm);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(120% 100% at 82% 0%, var(--ink-3) 0%, var(--ink-2) 34%, var(--ink) 72%),
    var(--ink);
  color: var(--warm);
  padding: clamp(88px, 13vw, 148px) 0 clamp(46px, 7vw, 86px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(250, 245, 234, 0.05) 0 1px, transparent 1px 92px),
    repeating-linear-gradient(0deg, rgba(250, 245, 234, 0.035) 0 1px, transparent 1px 92px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -46%;
  width: min(620px, 82vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(224, 163, 58, 0.24) 0%, rgba(224, 163, 58, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: rgba(250, 245, 234, 0.58);
}

.page-about .about-crumb a {
  color: rgba(250, 245, 234, 0.82);
  text-decoration: none;
  border-bottom: 1px solid rgba(250, 245, 234, 0.28);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--gold-bright);
  border-bottom-color: var(--gold-bright);
}

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

.page-about .about-eyebrow {
  margin: clamp(20px, 6vw, 40px) 0 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 7.4vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 17ch;
}

.page-about .about-hero__lead {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 62ch;
  font-size: clamp(0.98rem, 1.7vw, 1.1rem);
  line-height: 1.85;
  color: rgba(250, 245, 234, 0.84);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-light);
  border: 1px solid var(--line-light);
}

.page-about .about-stats li {
  background: rgba(11, 36, 31, 0.92);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .stat-num {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.35rem, 4.4vw, 1.9rem);
  letter-spacing: -0.01em;
  color: var(--gold);
  line-height: 1;
}

.page-about .stat-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: rgba(250, 245, 234, 0.72);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: var(--about-pad) 0;
}

.page-about .about-section--warm {
  background: var(--warm);
}

.page-about .about-section--paper {
  background: var(--paper);
  border-top: 1px dashed rgba(16, 33, 28, 0.2);
  border-bottom: 1px dashed rgba(16, 33, 28, 0.2);
}

.page-about .archive-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 4vw, 30px);
}

.page-about .archive-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-top: 10px;
  border-top: 2px solid var(--text);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 5vw, 2.2rem);
  line-height: 1;
  color: var(--gold);
}

.page-about .rail-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--text);
}

.page-about .rail-note {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: rgba(16, 33, 28, 0.55);
  margin-left: auto;
}

.page-about .archive-body > p {
  margin: 0 0 1em;
  max-width: 64ch;
  font-size: 1.03rem;
  line-height: 1.85;
}

.page-about .archive-title {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.6vw, 2.35rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  max-width: 20ch;
}

.page-about .archive-lede {
  font-size: clamp(1rem, 1.8vw, 1.1rem);
  line-height: 1.85;
  color: var(--text);
  padding-left: 14px;
  border-left: 3px solid var(--coral);
  max-width: 62ch;
  margin: 0 0 1em;
}

.page-about .archive-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--about-rule);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  line-height: 1.8;
  letter-spacing: 0.03em;
  color: rgba(16, 33, 28, 0.66);
  max-width: 66ch;
}

.page-about .archive-links {
  margin-top: 1.2em;
  font-size: 0.98rem;
}

.page-about .archive-links a {
  color: var(--wine);
  text-decoration: none;
  border-bottom: 2px solid var(--gold);
  padding-bottom: 1px;
}

.page-about .archive-links a:hover,
.page-about .archive-links a:focus-visible {
  background: var(--gold);
  color: var(--ink);
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 4vw, 36px) 0 0;
}

.page-about .media-frame {
  --media-ratio: 3 / 2;
  border: 2px solid var(--text);
  box-shadow: var(--shadow-print);
  background: var(--paper);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: rgba(16, 33, 28, 0.6);
}

/* ---------- 角色列表 ---------- */
.page-about .role-list {
  margin: clamp(24px, 4vw, 36px) 0 0;
  border-top: 2px solid var(--text);
}

.page-about .role {
  border-bottom: 1px dashed rgba(16, 33, 28, 0.26);
}

.page-about .role > summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 2px;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.22s var(--ease), padding-left 0.22s var(--ease);
}

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

.page-about .role > summary:hover {
  background: rgba(224, 163, 58, 0.16);
  padding-left: 12px;
}

.page-about .role > summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.page-about .role-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--wine);
  border: 1px solid currentColor;
  padding: 1px 5px;
}

.page-about .role-name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.page-about .role-count {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: rgba(16, 33, 28, 0.6);
}

.page-about .role-sign {
  margin-left: auto;
  width: 12px;
  height: 12px;
  position: relative;
  flex: 0 0 auto;
}

.page-about .role-sign::before,
.page-about .role-sign::after {
  content: "";
  position: absolute;
  background: var(--text);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.page-about .role-sign::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}

.page-about .role-sign::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}

.page-about details[open] > summary .role-sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .role > p {
  margin: 0;
  padding: 0 2px 18px;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(16, 33, 28, 0.86);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(22px, 4vw, 32px) 0 0;
  padding: 0 0 0 clamp(16px, 3vw, 24px);
  border-left: 2px solid rgba(16, 33, 28, 0.22);
}

.page-about .timeline > li {
  position: relative;
}

.page-about .timeline > li + li {
  margin-top: 6px;
}

.page-about .timeline > li::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(16px, 3vw, 24px) - 7px);
  top: 20px;
  width: 12px;
  height: 12px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .tl > summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  padding: 10px 4px;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.22s var(--ease);
}

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

.page-about .tl > summary:hover {
  background: rgba(231, 111, 81, 0.12);
}

.page-about .tl > summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.86rem;
  letter-spacing: 0.1em;
  color: var(--wine);
}

.page-about .tl-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.page-about .tl > p {
  margin: 0;
  padding: 0 4px 16px;
  max-width: 62ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: rgba(16, 33, 28, 0.84);
}

/* ---------- 流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: rgba(16, 33, 28, 0.16);
  border: 1px solid rgba(16, 33, 28, 0.16);
}

.page-about .flow > li {
  background: var(--warm);
  padding: clamp(15px, 3vw, 22px);
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 14px;
  align-items: baseline;
  transition: background-color 0.24s var(--ease), transform 0.24s var(--ease), color 0.24s var(--ease);
}

.page-about .flow > li:hover,
.page-about .flow > li:focus-visible {
  background: var(--ink);
  color: var(--warm);
  transform: translateY(-2px);
}

.page-about .flow > li:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}

.page-about .flow-num {
  grid-row: 1 / 3;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  line-height: 1;
  color: var(--gold);
}

.page-about .flow-name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
}

.page-about .flow-text {
  grid-column: 2;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(16, 33, 28, 0.8);
}

.page-about .flow > li:hover .flow-text,
.page-about .flow > li:focus-visible .flow-text {
  color: rgba(250, 245, 234, 0.84);
}

/* ---------- 协作原则 ---------- */
.page-about .principles {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .principles > li {
  padding: 18px 0 18px 18px;
  border-left: 3px solid var(--gold);
  border-bottom: 1px solid var(--about-rule);
  transition: border-left-color 0.22s var(--ease), padding-left 0.22s var(--ease);
}

.page-about .principles > li:hover {
  border-left-color: var(--coral);
  padding-left: 24px;
}

.page-about .pr-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--wine);
  margin-bottom: 6px;
}

.page-about .principles h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.06rem;
  letter-spacing: -0.01em;
}

.page-about .principles p {
  margin: 0;
  max-width: 60ch;
  font-size: 0.96rem;
  line-height: 1.82;
  color: rgba(16, 33, 28, 0.82);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  background: var(--ink);
  color: var(--warm);
  padding: clamp(42px, 7vw, 84px) 0;
  border-top: 6px solid var(--gold);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  align-items: center;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.45rem, 4.2vw, 2.1rem);
  letter-spacing: -0.015em;
  line-height: 1.2;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(250, 245, 234, 0.82);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 20px;
  }

  .page-about .principles > li {
    border-bottom: none;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) auto;
  }
}

@media (min-width: 900px) {
  .page-about .archive-grid {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
    align-items: start;
  }

  .page-about .archive-rail {
    position: sticky;
    top: 112px;
    display: block;
    padding-top: 14px;
  }

  .page-about .rail-num {
    display: block;
    font-size: 2.6rem;
  }

  .page-about .rail-year {
    display: block;
    margin-top: 8px;
  }

  .page-about .rail-note {
    display: block;
    margin: 10px 0 0;
    padding-top: 10px;
    border-top: 1px solid var(--about-rule);
  }

  .page-about .about-figure {
    margin-top: clamp(28px, 4vw, 44px);
  }

  .page-about .flow > li {
    grid-template-columns: 64px minmax(0, 1fr);
    padding: 22px 26px;
  }

  .page-about .archive-title {
    max-width: 24ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role > summary,
  .page-about .tl > summary,
  .page-about .flow > li,
  .page-about .principles > li,
  .page-about .role-sign::before,
  .page-about .role-sign::after {
    transition: none;
  }

  .page-about .flow > li:hover,
  .page-about .flow > li:focus-visible {
    transform: none;
  }
}