.page-about {
  --about-line-dark: var(--line-dark);
  background: var(--coal);
  color: var(--mist);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.4rem, 3.4vw, 2.4rem) 0 clamp(2.6rem, 6vw, 5rem);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(255, 90, 31, 0.2), transparent 58%),
    linear-gradient(158deg, var(--coal) 0%, var(--graphite) 64%, var(--graphite-2) 100%);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -30%;
  width: 46%;
  height: 70%;
  background: linear-gradient(140deg, rgba(79, 179, 169, 0.16), transparent 70%);
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(1.8rem, 4vw, 3rem);
  margin-top: clamp(1.4rem, 3vw, 2.6rem);
}

.page-about .about-hero__title {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 8.5vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: clamp(1rem, 2.4vw, 1.5rem) 0 0;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.8;
  color: var(--muted-dark);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-idcard {
  background: rgba(27, 31, 36, 0.86);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
  padding: var(--panel-pad);
  box-shadow: 0 30px 70px -40px rgba(0, 0, 0, 0.95);
}

.page-about .about-idcard__label {
  margin: 0 0 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--orange);
}

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

.page-about .about-idcard__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1rem;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.62rem 0;
  border-bottom: 1px dashed var(--line-dark);
  font-size: 0.94rem;
}

.page-about .about-idcard__row:last-child {
  border-bottom: 0;
}

.page-about .about-idcard__k {
  color: var(--muted-dark);
}

.page-about .about-idcard__v {
  font-family: var(--font-mono);
  color: var(--mist);
}

.page-about .about-idcard__v--accent {
  color: var(--orange);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
  padding-top: clamp(2rem, 5vw, 4rem);
  padding-bottom: clamp(3rem, 7vw, 6rem);
}

.page-about .about-index__label {
  margin: 0 0 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted-dark);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.4rem;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: 0.6rem;
  overflow-x: auto;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--muted-dark);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease), background-color var(--speed) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--mist);
  border-color: var(--orange);
  background: var(--graphite);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(1.5rem, 3.4vw, 2.6rem);
  min-width: 0;
}

/* ---------- 章节面板 ---------- */
.page-about .about-panel {
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
  padding: clamp(1.3rem, 3.6vw, 2.8rem);
  overflow: hidden;
}

.page-about .about-panel--graphite {
  background: linear-gradient(170deg, var(--graphite) 0%, var(--graphite-2) 100%);
}

.page-about .about-panel--coal {
  background: #0b0d0f;
}

.page-about .about-panel--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--line-light);
}

.page-about .about-head {
  display: flex;
  align-items: baseline;
  gap: clamp(0.7rem, 2vw, 1.4rem);
  padding-bottom: clamp(0.9rem, 2vw, 1.4rem);
  margin-bottom: clamp(1rem, 2.4vw, 1.6rem);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-panel--paper .about-head {
  border-bottom-color: var(--line-light);
}

.page-about .about-head__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.65rem, 3.8vw, 2.7rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-panel--paper .about-h2 {
  color: var(--ink);
}

.page-about .about-head__sub {
  margin: 0.4rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted-dark);
}

.page-about .about-panel--paper .about-head__sub {
  color: var(--muted-light);
}

.page-about .about-p {
  max-width: 64ch;
  margin: 0 0 1rem;
  font-size: clamp(1rem, 1.3vw, 1.06rem);
  line-height: 1.82;
  color: var(--muted-dark);
}

.page-about .about-panel--paper .about-p {
  color: var(--muted-light);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(1.2rem, 3vw, 1.9rem) 0;
}

.page-about .about-figure .figure__frame {
  overflow: hidden;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-dark);
  background: var(--titanium);
}

.page-about .about-panel--paper .about-figure .figure__frame {
  border-color: var(--line-light);
}

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

.page-about .about-figure .figure__caption {
  margin-top: 0.7rem;
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--muted-dark);
}

.page-about .about-panel--paper .about-figure .figure__caption {
  color: var(--muted-light);
}

/* ---------- 职能矩阵 ---------- */
.page-about .about-duties {
  display: grid;
  gap: 0.7rem;
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .duty {
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-m);
  background: rgba(251, 248, 242, 0.03);
  padding: 0.85rem 1rem;
  transition: border-color var(--speed) var(--ease), background-color var(--speed) var(--ease);
}

.page-about .duty:hover,
.page-about .duty[open] {
  border-color: var(--orange);
  background: rgba(255, 90, 31, 0.07);
}

.page-about .duty__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.55rem;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .duty[open] .duty__summary::after {
  content: "–";
}

.page-about .duty__tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--card-yellow);
  border: 1px solid rgba(231, 195, 90, 0.45);
  border-radius: 999px;
  padding: 0.12rem 0.55rem;
}

.page-about .duty__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .duty__text {
  margin: 0.7rem 0 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--muted-dark);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 2rem) 0 0;
  padding: 0 0 0 1.8rem;
  position: relative;
  display: grid;
  gap: 0.9rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), rgba(255, 90, 31, 0.08));
}

.page-about .timeline__item {
  position: relative;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -1.8rem;
  top: 0.7rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--coal);
  border: 2px solid var(--orange);
  transition: background-color var(--speed) var(--ease), transform var(--speed) var(--ease);
}

.page-about .timeline__item:hover::before {
  background: var(--orange);
  transform: scale(1.18);
}

.page-about .timeline__year {
  margin: 0 0 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .timeline__card {
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-m);
  background: rgba(251, 248, 242, 0.03);
  padding: 0.85rem 1rem;
  transition: border-color var(--speed) var(--ease), background-color var(--speed) var(--ease);
}

.page-about .timeline__item:hover .timeline__card {
  border-color: var(--data-teal);
  background: var(--graphite);
}

.page-about .timeline__title {
  margin: 0 0 0.35rem;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.74;
  color: var(--muted-dark);
}

/* ---------- 数据表 ---------- */
.page-about .about-tablewrap {
  margin: clamp(1.2rem, 3vw, 1.8rem) 0;
  overflow-x: auto;
  border: 1px solid var(--line-light);
  border-radius: var(--radius-m);
  background: var(--mist);
}

.page-about .about-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 0.94rem;
}

.page-about .about-table__caption {
  padding: 0.8rem 0.9rem 0;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--link-paper);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 0.7rem 0.9rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-light);
  line-height: 1.65;
}

.page-about .about-table thead th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-light);
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-table tbody th {
  font-weight: 500;
  white-space: nowrap;
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table tbody tr {
  transition: background-color var(--speed) var(--ease);
}

.page-about .about-table tbody tr:hover {
  background: var(--paper-2);
}

.page-about .state {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.18rem 0.6rem;
  border: 1px solid;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  line-height: 1.5;
}

.page-about .state::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.page-about .state--red {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--mist);
}

.page-about .state--yellow {
  background: var(--card-yellow);
  border-color: var(--card-yellow);
  color: var(--ink);
}

.page-about .state--teal {
  background: var(--data-teal);
  border-color: var(--data-teal);
  color: var(--coal);
}

.page-about .state--muted {
  background: transparent;
  border-color: var(--line-light);
  color: var(--muted-light);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 0.9rem;
  margin: clamp(1.2rem, 3vw, 1.8rem) 0;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
}

.page-about .about-stats .stat {
  border-left: 2px solid var(--orange);
  padding-left: 0.75rem;
}

.page-about .about-stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1.1;
  color: var(--mist);
}

.page-about .about-stats .stat__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--muted-dark);
}

.page-about .honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .honor {
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--card-yellow);
  border-radius: var(--radius-s);
  background: rgba(251, 248, 242, 0.03);
  padding: 0.8rem 0.95rem;
  transition: border-color var(--speed) var(--ease), background-color var(--speed) var(--ease), transform var(--speed) var(--ease);
}

.page-about .honor:hover {
  border-left-color: var(--orange);
  background: rgba(255, 90, 31, 0.08);
  transform: translateY(-2px);
}

.page-about .honor__name {
  display: block;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .honor__note {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--muted-dark);
}

/* ---------- 服务与联络 ---------- */
.page-about .about-service {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2rem);
}

.page-about .about-service__points {
  display: grid;
  gap: 1rem;
}

.page-about .point {
  border-top: 1px solid var(--line-light);
  padding-top: 0.8rem;
}

.page-about .point__num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--link-paper);
}

.page-about .point__title {
  margin: 0.35rem 0 0.4rem;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink);
}

.page-about .point__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--muted-light);
}

.page-about .contact-sheet {
  background: var(--paper-2);
  border: 1px solid var(--line-light);
  border-radius: var(--radius-m);
  padding: var(--panel-pad);
}

.page-about .contact-sheet__label {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--link-paper);
}

.page-about .contact-sheet__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px dashed var(--line-light);
  font-size: 0.94rem;
}

.page-about .contact-sheet__row:last-child {
  border-bottom: 0;
}

.page-about .contact-sheet__k {
  color: var(--muted-light);
}

.page-about .contact-sheet__v {
  color: var(--ink);
  font-weight: 500;
}

.page-about .contact-sheet__v--mono {
  font-family: var(--font-mono);
  font-weight: 400;
  word-break: break-word;
}

.page-about .about-links {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.1rem;
}

.page-about .about-link {
  display: block;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line-light);
  font-size: 0.94rem;
  color: var(--link-paper);
  text-decoration: none;
  transition: color var(--speed) var(--ease), padding-left var(--speed) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--orange);
  padding-left: 0.35rem;
}

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

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

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

@media (min-width: 860px) {
  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 1rem;
    align-items: start;
  }

  .page-about .timeline__year {
    margin: 0.85rem 0 0;
    text-align: right;
    padding-right: 0.3rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.9fr);
    align-items: end;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
    gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
  }

  .page-about .about-index__list {
    grid-auto-flow: row;
    gap: 0.1rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    display: flex;
    width: 100%;
    padding: 0.55rem 0.2rem;
    border: 0;
    border-bottom: 1px solid transparent;
    border-radius: 0;
    background: none;
    font-size: 0.95rem;
    white-space: normal;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: none;
    border-bottom-color: var(--orange);
  }

  .page-about .about-service {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}