.page-about {
  max-width: 1240px;
  margin: 0 auto;
  padding: 26px 20px 84px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}

@media (min-width: 768px) {
  .page-about {
    padding: 44px 36px 108px;
  }
}

@media (min-width: 1200px) {
  .page-about {
    padding: 56px 56px 132px;
  }
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 0 0 32px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--celadon);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--line);
}

.page-about .breadcrumb a {
  color: var(--celadon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--bronze-lit);
  border-bottom-color: var(--bronze-lit);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: 42px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero-eyebrow {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--bronze);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 30px;
  line-height: 1.34;
  letter-spacing: 0.045em;
  color: var(--paper);
  max-width: 17em;
}

@media (min-width: 768px) {
  .page-about .about-hero h1 {
    font-size: 42px;
    letter-spacing: 0.06em;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero h1 {
    font-size: 58px;
    line-height: 1.22;
  }
}

.page-about .about-hero-lead {
  margin: 0 0 34px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--paper);
  opacity: 0.85;
  max-width: 60ch;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  list-style: none;
  margin: 0;
  padding: 1px;
  background: var(--line);
  border-top: 2px solid var(--bronze);
}

@media (min-width: 760px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 20px;
  background: var(--ink);
}

.page-about .about-stat-num {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: 0.05em;
  color: var(--bronze-lit);
}

@media (min-width: 768px) {
  .page-about .about-stat-num {
    font-size: 30px;
  }
}

.page-about .about-stat-label {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--celadon);
}

/* ---------- 分区骨架 ---------- */
.page-about .about-section {
  padding: 54px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 960px) {
  .page-about .about-section {
    padding: 72px 0;
  }
}

.page-about .about-lane {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

@media (min-width: 960px) {
  .page-about .about-lane {
    grid-template-columns: 164px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
}

.page-about .about-mark {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 16px;
  background: linear-gradient(155deg, #17304a 0%, #0d2033 100%);
  border-top: 2px solid var(--bronze);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  box-shadow: inset 0 1px 0 rgba(230, 188, 114, 0.35), inset 0 -14px 22px -18px var(--shadow-ink);
  justify-self: start;
}

@media (min-width: 960px) {
  .page-about .about-mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 7px;
    width: 100%;
    padding: 15px 16px 17px;
    position: sticky;
    top: calc(var(--shell-top, 140px) + 20px);
  }
}

.page-about .about-mark-index {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--bronze);
}

.page-about .about-mark-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--paper);
}

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

.page-about .about-body h2 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 23px;
  line-height: 1.42;
  letter-spacing: 0.05em;
  color: var(--paper);
}

@media (min-width: 768px) {
  .page-about .about-body h2 {
    font-size: 31px;
    letter-spacing: 0.06em;
  }
}

.page-about .about-body p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 239, 230, 0.84);
  max-width: 66ch;
}

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

.page-about .about-lede::first-letter {
  float: left;
  margin: 6px 10px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 52px;
  line-height: 0.86;
  letter-spacing: 0.04em;
  color: var(--bronze-lit);
}

.page-about .about-code {
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--bronze-lit);
  padding: 1px 6px;
  border: 1px solid rgba(192, 138, 62, 0.4);
  background: rgba(192, 138, 62, 0.08);
  white-space: nowrap;
}

.page-about .about-body a {
  color: var(--bronze-lit);
  text-decoration: none;
  border-bottom: 1px solid rgba(230, 188, 114, 0.4);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-body a:hover,
.page-about .about-body a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.page-about .about-callout {
  margin-top: 22px !important;
  padding: 18px 20px;
  background: rgba(18, 41, 63, 0.7);
  border-left: 2px solid var(--cinnabar);
  font-size: 15.5px !important;
}

/* ---------- 时间轴 ---------- */
.page-about .about-axis-figure {
  margin: 0 0 38px;
}

.page-about .about-axis-figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom, var(--bronze) 0%, var(--line) 16%, var(--line) 84%, rgba(46, 74, 97, 0.2) 100%);
}

.page-about .about-epoch {
  position: relative;
  padding-left: 36px;
  margin-bottom: 34px;
}

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

.page-about .about-epoch::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--bronze);
  box-shadow: 0 0 0 4px var(--ink);
}

.page-about .about-epoch-plate {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
  padding: 7px 15px 8px;
  background: linear-gradient(150deg, #18324c 0%, #0d2033 100%);
  border-top: 2px solid var(--bronze);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  box-shadow: inset 0 1px 0 rgba(230, 188, 114, 0.32), inset 0 -12px 20px -16px var(--shadow-ink);
}

.page-about .about-epoch-year {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.1em;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .about-epoch-ver {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--bronze);
}

.page-about .about-epoch-body h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-epoch-body p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 239, 230, 0.8);
  max-width: 64ch;
}

.page-about .about-fold summary {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 5px 0;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--bronze-lit);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-fold summary::before {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg) translate(-1px, -1px);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-fold[open] summary::before {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-about .about-fold summary:focus-visible {
  outline: 2px solid var(--bronze-lit);
  outline-offset: 3px;
}

.page-about .about-fold ul {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-fold li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 239, 230, 0.76);
  max-width: 64ch;
}

.page-about .about-fold li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 10px;
  height: 1px;
  background: var(--bronze);
}

@media (min-width: 960px) {
  .page-about .about-timeline::before {
    left: 166px;
  }

  .page-about .about-epoch {
    display: grid;
    grid-template-columns: 144px minmax(0, 1fr);
    gap: 44px;
    padding-left: 0;
    margin-bottom: 44px;
    align-items: start;
  }

  .page-about .about-epoch::before {
    left: 158px;
    top: 16px;
  }

  .page-about .about-epoch-plate {
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
    width: 100%;
    margin-bottom: 0;
    padding: 14px 16px 16px;
  }

  .page-about .about-epoch-year {
    font-size: 21px;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-crew-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-bottom: 36px;
}

@media (min-width: 900px) {
  .page-about .about-crew-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 44px;
    align-items: start;
  }
}

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

.page-about .about-craft-figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

@media (min-width: 700px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }

  .page-about .about-crew-card:nth-child(2) {
    margin-top: 32px;
  }

  .page-about .about-crew-card:nth-child(3) {
    margin-top: 64px;
  }

  .page-about .about-crew-card:nth-child(4) {
    margin-top: 16px;
  }
}

.page-about .about-crew-card {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--deep);
  border-top: 2px solid var(--bronze);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  box-shadow: inset 0 1px 0 rgba(230, 188, 114, 0.26), 0 20px 32px -28px var(--shadow-ink);
}

.page-about .about-crew-no {
  display: block;
  margin-bottom: 10px;
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--bronze);
}

.page-about .about-crew-card h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-about .about-crew-card > p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.78);
}

.page-about .about-crew-list {
  list-style: none;
  margin: 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 8px;
}

.page-about .about-crew-list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--celadon);
}

.page-about .about-crew-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 1px;
  background: var(--jade);
}

/* ---------- 值班 ---------- */
.page-about .about-shift {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-shift li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

@media (min-width: 620px) {
  .page-about .about-shift li {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

.page-about .about-shift-time {
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--bronze);
}

.page-about .about-shift-text {
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.82);
}

/* ---------- 协作 ---------- */
.page-about .about-partner-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

@media (min-width: 900px) {
  .page-about .about-partner-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 46px;
    align-items: start;
  }
}

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

.page-about .about-network-figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

/* ---------- 回访 ---------- */
.page-about .about-review {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 26px 0 28px;
  padding: 1px;
  background: var(--line);
  border-top: 2px solid var(--cinnabar);
}

@media (min-width: 620px) {
  .page-about .about-review {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-review-stat {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 22px 20px 24px;
  background: var(--ink);
}

.page-about .about-review-num {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 40px;
  line-height: 1.05;
  letter-spacing: 0.05em;
  color: var(--bronze-lit);
}

.page-about .about-review-num em {
  font-style: normal;
  font-size: 22px;
  letter-spacing: 0.08em;
  color: var(--cinnabar);
}

.page-about .about-review-label {
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--celadon);
}

/* ---------- 收束 ---------- */
.page-about .about-outro {
  margin-top: 56px;
  padding: 36px 24px 40px;
  background: linear-gradient(140deg, #14293f 0%, #0b1a2b 100%);
  border-top: 2px solid var(--cinnabar);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

@media (min-width: 768px) {
  .page-about .about-outro {
    padding: 46px 42px 52px;
  }
}

.page-about .about-outro h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: 0.06em;
  color: var(--paper);
}

@media (min-width: 768px) {
  .page-about .about-outro h2 {
    font-size: 30px;
  }
}

.page-about .about-outro p {
  margin: 0 0 26px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 239, 230, 0.82);
  max-width: 56ch;
}

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

.page-about .about-outro-links .btn {
  text-decoration: none;
  white-space: nowrap;
}

@media (max-width: 520px) {
  .page-about .about-outro-links .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}