.page-about {
  --about-hair: rgba(201, 162, 39, 0.26);
  --about-hair-soft: rgba(201, 162, 39, 0.13);
  --about-rail-w: 232px;
  --about-gold-deep: #6e5510;
  background:
    radial-gradient(120% 55% at 88% -6%, rgba(46, 125, 111, 0.18), transparent 62%),
    radial-gradient(80% 45% at 4% 3%, rgba(201, 162, 39, 0.1), transparent 62%),
    var(--ink);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: break-word;
}

/* ---------- 面包屑 ---------- */
.page-about .about-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  max-width: var(--surface-max);
  margin-inline: auto;
  padding: 22px var(--page-x) 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--haze);
}

.page-about .about-breadcrumb a {
  color: var(--haze);
  text-decoration: none;
  transition: color var(--ease);
}

.page-about .about-breadcrumb a:hover {
  color: var(--gold-2);
}

.page-about .about-breadcrumb__sep {
  color: rgba(201, 162, 39, 0.55);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  max-width: var(--surface-max);
  margin-inline: auto;
  padding: clamp(36px, 6vw, 78px) var(--page-x) clamp(44px, 6vw, 82px);
  border-bottom: 1px solid var(--about-hair);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(52vw, 560px);
  height: 100%;
  background: linear-gradient(205deg, rgba(201, 162, 39, 0.16) 0%, rgba(20, 41, 74, 0.9) 46%, rgba(11, 27, 51, 0) 100%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__edge {
  position: absolute;
  top: 10%;
  bottom: 10%;
  right: min(52vw, 560px);
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--gold) 18%, var(--gold) 78%, transparent);
  transform: rotate(13deg);
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  max-width: 1000px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(2.4rem, 6.4vw, 5rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: 0;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(244, 239, 228, 0.82);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  margin: 34px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-hero__facts dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--haze);
}

.page-about .about-hero__facts dd {
  margin: 6px 0 0;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  line-height: 1.3;
  color: var(--gold-2);
}

/* ---------- 两栏骨架 ---------- */
.page-about .about-body {
  max-width: var(--surface-max);
  margin-inline: auto;
  padding: 0 var(--page-x) clamp(64px, 8vw, 120px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-rail {
  padding: 22px 0 6px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 2px 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--haze);
  text-decoration: none;
  transition: color var(--ease);
}

.page-about .about-rail__link:hover {
  color: var(--gold-2);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--gold-2);
}

.page-about .about-rail__no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: rgba(201, 162, 39, 0.7);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-top: clamp(38px, 5.5vw, 72px);
  margin-bottom: clamp(38px, 5.5vw, 72px);
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-section__no {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-section__title {
  max-width: 28ch;
  margin: 0 0 20px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-section__lead {
  max-width: 62ch;
  margin: 0 0 20px;
  font-size: 15px;
  color: rgba(244, 239, 228, 0.78);
}

.page-about .about-section p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 239, 228, 0.82);
}

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

.page-about .about-link {
  color: var(--gold-2);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 39, 0.5);
  transition: border-color var(--ease), color var(--ease);
}

.page-about .about-link:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 正文与旁注 ---------- */
.page-about .about-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

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

.page-about .about-aside {
  position: relative;
  background: var(--paper);
  color: var(--ink-black);
  padding: 20px 18px 18px;
  border-top: 2px solid var(--gold);
  border-bottom: 1px solid rgba(20, 23, 28, 0.12);
}

.page-about .about-aside__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--about-gold-deep);
}

.page-about .about-aside__list {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
}

.page-about .about-aside__list li {
  position: relative;
  padding: 7px 0 7px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(20, 23, 28, 0.84);
  border-bottom: 1px dotted rgba(20, 23, 28, 0.16);
}

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

.page-about .about-aside__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 8px;
  height: 1px;
  background: var(--about-gold-deep);
}

.page-about .about-aside__foot {
  margin: 0;
  padding-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(20, 23, 28, 0.62);
  border-top: 1px solid rgba(20, 23, 28, 0.12);
}

.page-about .about-link--dark {
  color: var(--about-gold-deep);
  border-bottom-color: rgba(110, 85, 16, 0.45);
}

.page-about .about-link--dark:hover {
  color: var(--ink-black);
  border-bottom-color: var(--ink-black);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 28px;
  border: 1px solid var(--about-hair);
  background: var(--ink-2);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--haze);
  border-top: 1px solid var(--about-hair-soft);
}

/* ---------- 分类树 ---------- */
.page-about .about-tree {
  list-style: none;
  margin: 20px 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 18px;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-tree li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(244, 239, 228, 0.88);
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .about-tree__no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--gold);
}

/* ---------- 表格 ---------- */
.page-about .about-tablewrap {
  margin: 22px 0;
  overflow-x: auto;
  border: 1px solid var(--about-hair);
  background: rgba(20, 41, 74, 0.5);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table caption {
  padding: 12px 14px;
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--haze);
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .about-table th {
  padding: 10px 14px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--gold);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-table td {
  padding: 11px 14px;
  color: rgba(244, 239, 228, 0.86);
  border-bottom: 1px solid rgba(201, 162, 39, 0.12);
}

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

.page-about .about-table td.num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  color: var(--paper);
}

.page-about .about-table tbody tr:hover {
  background: rgba(201, 162, 39, 0.06);
}

/* ---------- 折叠注解 ---------- */
.page-about .about-notes {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.page-about .disclosure {
  border: 1px solid var(--about-hair);
  background: rgba(20, 41, 74, 0.42);
}

.page-about .disclosure__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 13px 14px;
  border: 0;
  background: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  transition: color var(--ease);
}

.page-about .disclosure__trigger:hover {
  color: var(--gold-2);
}

.page-about .disclosure__trigger::after {
  content: "+";
  font-family: var(--mono);
  font-size: 15px;
  color: var(--gold);
}

.page-about .disclosure__trigger[aria-expanded="true"]::after {
  content: "−";
}

.page-about .disclosure__panel {
  padding: 0 14px 14px;
}

.page-about .disclosure__panel p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 239, 228, 0.8);
}

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

/* ---------- 滚动窗口条 ---------- */
.page-about .about-window {
  margin: 24px 0;
}

.page-about .about-window__bar {
  position: relative;
  height: 44px;
  border: 1px solid var(--about-hair);
  background: linear-gradient(90deg, rgba(201, 162, 39, 0.3) 0%, rgba(46, 125, 111, 0.24) 62%, rgba(20, 41, 74, 0.8) 100%);
}

.page-about .about-window__bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(201, 162, 39, 0.3) 0 1px, transparent 1px 10%);
  pointer-events: none;
}

.page-about .about-window__bar::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 4px;
  background: var(--gold);
}

.page-about .about-window__scale {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--haze);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
  margin: 22px 0;
}

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

.page-about .about-team__stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px;
  background: rgba(20, 41, 74, 0.58);
}

.page-about .about-team__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  line-height: 1;
  color: var(--gold-2);
}

.page-about .about-team__role {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(244, 239, 228, 0.74);
}

.page-about .about-team__fig {
  margin: 0;
  border: 1px solid var(--about-hair);
  background: var(--ink-2);
}

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

.page-about .about-team__fig figcaption {
  padding: 8px 12px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--haze);
  border-top: 1px solid var(--about-hair-soft);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 6px;
}

.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(201, 162, 39, 0.1));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border: 1px solid var(--gold);
  background: var(--ink);
  transition: background var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--gold);
}

.page-about .about-timeline__year {
  margin: 0 0 4px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-timeline__name {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-timeline__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 239, 228, 0.64);
  transition: color var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__note {
  color: rgba(244, 239, 228, 0.9);
}

.page-about .about-timeline__fig {
  margin: 0;
  border: 1px solid var(--about-hair);
  background: var(--ink-2);
}

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

.page-about .about-timeline__fig figcaption {
  padding: 8px 12px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--haze);
  border-top: 1px solid var(--about-hair-soft);
}

/* ---------- 联系信息 ---------- */
.page-about .about-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: 0 0 20px;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-contact > div {
  padding: 12px 0;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .about-contact dt {
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--haze);
}

.page-about .about-contact dd {
  margin: 0;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-contact dd.about-contact__text {
  font-family: var(--sans);
  letter-spacing: 0.01em;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px 28px;
  }

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

  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 36px;
  }

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

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 40px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    padding: 42px 0 0;
    border-bottom: 0;
  }

  .page-about .about-rail__title {
    padding-left: 14px;
  }

  .page-about .about-rail__list {
    display: block;
  }

  .page-about .about-rail__link {
    display: block;
    padding: 7px 0 7px 14px;
    border-left: 2px solid transparent;
  }

  .page-about .about-rail__link[aria-current="true"] {
    border-left-color: var(--gold);
    background: linear-gradient(90deg, rgba(201, 162, 39, 0.09), transparent);
  }

  .page-about .about-section:first-child {
    border-top-color: transparent;
  }
}

@media (min-width: 1100px) {
  .page-about .about-timeline-layout {
    grid-template-columns: minmax(0, 1fr) 264px;
    gap: 52px;
    align-items: start;
  }
}

@media (min-width: 1280px) {
  .page-about .about-block {
    grid-template-columns: minmax(0, 1fr) 288px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hero__grid {
    max-width: 62%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-breadcrumb a,
  .page-about .about-rail__link,
  .page-about .about-link,
  .page-about .about-timeline__item::before,
  .page-about .about-timeline__note,
  .page-about .disclosure__trigger {
    transition: none;
  }
}