.page-about {
  --about-gap: clamp(18px, 2.6vw, 42px);
  --about-block: clamp(36px, 5.2vw, 78px);
  --about-pad: clamp(16px, 2.2vw, 28px);
  padding-bottom: clamp(48px, 7vw, 104px);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(16px, 2.4vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(24px, 4vw, 56px) 0 clamp(26px, 3.6vw, 52px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(calc(90deg + var(--angle)), rgba(42, 26, 71, 0.94) 0%, rgba(42, 26, 71, 0.5) 34%, rgba(21, 11, 38, 0) 66%),
    radial-gradient(120% 90% at 90% 0%, rgba(217, 169, 74, 0.16), transparent 62%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.6vw, 54px);
}

.page-about .about-hero__body h1 {
  margin: 0.18em 0 0.4em;
  font-family: var(--serif);
  font-size: var(--fs-hero);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--c-paper);
  text-shadow: 0 0 30px rgba(217, 169, 74, 0.2);
}

.page-about .about-hero__lead {
  margin: 0 0 1.1em;
  max-width: 52ch;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.78;
  color: var(--c-paper);
  opacity: 0.94;
}

.page-about .about-hero__note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-gold);
  font-size: var(--fs-meta);
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-hero__aside {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  background: linear-gradient(158deg, rgba(42, 26, 71, 0.94), rgba(11, 6, 20, 0.94));
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__aside::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(18px, 2.4vw, 30px);
  width: 58px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--c-gold);
}

.page-about .about-hero__brand {
  margin: 0.6em 0 0.2em;
  font-family: var(--serif);
  font-size: clamp(19px, 2.1vw, 25px);
  letter-spacing: 0.02em;
  color: var(--c-gold-hi);
}

.page-about .about-hero__domain {
  margin: 0 0 1em;
  font-size: var(--fs-meta);
  color: var(--c-muted);
  word-break: break-all;
}

.page-about .about-hero__aside-note {
  margin: 0;
  padding-top: 0.9em;
  border-top: 1px solid var(--c-line);
  font-size: var(--fs-meta);
  line-height: 1.75;
  color: var(--c-muted);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.58fr);
    align-items: end;
  }
}

/* ---------- 分栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4.4vw, 62px);
  padding-top: clamp(30px, 4.6vw, 68px);
}

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

.page-about .af + .af {
  margin-top: var(--about-block);
}

/* ---------- 区块通用 ---------- */
.page-about .af {
  scroll-margin-top: calc(var(--header-h) + 22px);
}

.page-about .af__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 1.6vw, 20px);
  padding-bottom: 14px;
  margin-bottom: clamp(16px, 2.2vw, 26px);
  border-bottom: 1px solid var(--c-line);
}

.page-about .af__idx {
  flex: none;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--c-gold);
}

.page-about .af__title {
  margin: 0;
  font-size: clamp(23px, 2.7vw, 31px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.005em;
  color: var(--c-paper);
}

.page-about .af__lead {
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  max-width: 66ch;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--c-paper);
  opacity: 0.9;
}

.page-about .af__tail {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 66ch;
  padding-top: 1em;
  border-top: 1px solid var(--c-line);
  font-size: var(--fs-meta);
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .af--narrow .prose {
  max-width: 64ch;
}

/* ---------- 键值列表 ---------- */
.page-about .af-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .af-list--tight {
  margin-top: clamp(16px, 2.2vw, 26px);
}

.page-about .af-list__row {
  display: grid;
  gap: 8px;
  padding: clamp(14px, 1.9vw, 22px) clamp(16px, 2.2vw, 26px);
  background: linear-gradient(180deg, var(--c-bg), rgba(34, 20, 59, 0.55));
}

.page-about .af-list__k {
  font-size: var(--fs-meta);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--c-gold);
}

.page-about .af-list__v {
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--c-paper);
  opacity: 0.9;
}

@media (min-width: 720px) {
  .page-about .af-list__row {
    grid-template-columns: minmax(0, 8em) minmax(0, 1fr);
    gap: clamp(14px, 2vw, 28px);
    align-items: baseline;
  }
}

/* ---------- 编号 / 版本规则 ---------- */
.page-about .af-rule {
  list-style: none;
  margin: 0 0 clamp(20px, 2.6vw, 32px);
  padding: 0;
  display: grid;
  gap: clamp(12px, 1.6vw, 18px);
}

.page-about .af-rule__row {
  position: relative;
  padding-left: clamp(16px, 2vw, 24px);
  border-left: 2px solid var(--c-gold);
}

.page-about .af-rule__k {
  display: block;
  margin-bottom: 6px;
  font-size: var(--fs-card);
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .af-rule__v {
  display: block;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--c-muted);
}

/* ---------- 图 ---------- */
.page-about .af-figure,
.page-about .af-band,
.page-about .af-team__fig {
  margin: 0 0 clamp(20px, 2.8vw, 34px);
}

.page-about .af-figure img,
.page-about .af-band img,
.page-about .af-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  background: var(--c-deep);
}

.page-about .af-figure figcaption {
  margin-top: 12px;
  font-size: var(--fs-cap);
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .af-band img {
  border-radius: var(--radius-md);
  filter: saturate(0.9) brightness(0.92);
}

/* ---------- 三级校对卡片 ---------- */
.page-about .af-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 1.8vw, 22px);
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.page-about .af-card {
  padding: clamp(16px, 2.2vw, 26px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  background: linear-gradient(155deg, var(--c-cabinet) 0%, var(--c-cabinet-2) 100%);
  box-shadow: var(--shadow-card);
}

.page-about .af-card__title {
  margin: 0 0 0.6em;
  font-size: var(--fs-card);
  font-weight: 700;
  color: var(--c-gold-hi);
}

.page-about .af-card p {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--c-muted);
}

@media (min-width: 760px) {
  .page-about .af-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .af-card:nth-child(2) {
    transform: translateY(clamp(12px, 2vw, 28px));
  }
}

/* ---------- 时间线 ---------- */
.page-about .about-tline {
  margin-top: clamp(16px, 2.2vw, 26px);
}

.page-about .tline__item {
  position: relative;
  margin-left: clamp(10px, 1.6vw, 18px);
  padding-left: clamp(18px, 2.4vw, 32px);
  padding-bottom: clamp(12px, 1.6vw, 18px);
  border-left: 1px solid var(--c-line);
}

.page-about .tline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .tline__item::before {
  content: "";
  position: absolute;
  left: calc(var(--dot, 11px) / -2 - 1px);
  top: clamp(20px, 2.4vw, 26px);
  width: var(--dot, 11px);
  height: var(--dot, 11px);
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px rgba(217, 169, 74, 0.14);
}

.page-about .tline__item:nth-child(1) { --dot: 9px; }
.page-about .tline__item:nth-child(2) { --dot: 12px; }
.page-about .tline__item:nth-child(3) { --dot: 14px; }
.page-about .tline__item:nth-child(4) { --dot: 16px; }

.page-about .tline__trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: clamp(10px, 1.6vw, 20px);
  width: 100%;
  padding: clamp(14px, 1.8vw, 20px) clamp(15px, 2vw, 22px);
  text-align: left;
  color: var(--c-paper);
  background: rgba(42, 26, 71, 0.5);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color 0.24s ease, background 0.24s ease;
}

.page-about .tline__trigger:hover {
  border-color: var(--c-gold);
  background: rgba(42, 26, 71, 0.8);
}

.page-about .tline__trigger:focus-visible {
  outline: 2px solid var(--c-gold-hi);
  outline-offset: 2px;
}

.page-about .tline__trigger[aria-expanded="true"] {
  border-color: var(--c-gold);
}

.page-about .tline__year {
  font-size: clamp(16px, 1.7vw, 19px);
  letter-spacing: 0.02em;
  color: var(--c-gold-hi);
}

.page-about .tline__name {
  font-size: var(--fs-body);
  font-weight: 700;
  line-height: 1.5;
}

.page-about .tline__count {
  font-size: var(--fs-meta);
  color: var(--c-teal);
  white-space: nowrap;
}

.page-about .tline__panel {
  padding: clamp(12px, 1.6vw, 18px) clamp(15px, 2vw, 22px) 0;
}

.page-about .tline__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--c-muted);
}

/* ---------- 团队 ---------- */
.page-about .af-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 2.8vw, 36px);
}

.page-about .af-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 1.6vw, 18px);
}

.page-about .team-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num name"
    "num note";
  column-gap: clamp(12px, 1.8vw, 20px);
  row-gap: 4px;
  padding: clamp(14px, 1.9vw, 20px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  background: rgba(42, 26, 71, 0.42);
  transition: border-color 0.24s ease, transform 0.24s ease, background 0.24s ease;
}

.page-about .team-item:hover,
.page-about .team-item:focus-within {
  border-color: var(--c-gold);
  background: rgba(42, 26, 71, 0.82);
  transform: translateY(-2px);
}

.page-about .team-item__num {
  grid-area: num;
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-gold-hi);
}

.page-about .team-item__name {
  grid-area: name;
  font-size: var(--fs-card);
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .team-item__note {
  grid-area: note;
  font-size: var(--fs-meta);
  line-height: 1.75;
  color: var(--c-muted);
}

@media (min-width: 780px) {
  .page-about .af-team {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }
}

/* ---------- 语言支持 ---------- */
.page-about .af-dup {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.2vw, 28px);
}

.page-about .af-dup__col {
  padding: clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  background: linear-gradient(170deg, rgba(42, 26, 71, 0.6), rgba(11, 6, 20, 0.6));
}

.page-about .af-dup__title {
  margin: 0 0 0.8em;
  font-size: var(--fs-card);
  font-weight: 700;
  color: var(--c-teal);
}

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

.page-about .tick-list li {
  position: relative;
  padding-left: 18px;
  font-size: var(--fs-meta);
  line-height: 1.78;
  color: var(--c-paper);
  opacity: 0.88;
}

.page-about .tick-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--c-gold);
}

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

/* ---------- 正文段落 ---------- */
.page-about .prose p {
  margin: 0 0 1.5em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--c-paper);
  opacity: 0.9;
}

.page-about .prose--ruled p + p {
  padding-top: 1.5em;
  border-top: 1px solid var(--c-line);
}

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

/* ---------- 栏目对照 ---------- */
.page-about .af-map {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(10px, 1.4vw, 14px);
}

.page-about .af-map__row {
  display: grid;
  gap: 6px;
  padding: clamp(14px, 1.9vw, 20px) clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  background: rgba(21, 11, 38, 0.8);
  text-decoration: none;
  transition: border-color 0.24s ease, background 0.24s ease, transform 0.24s ease;
}

.page-about .af-map__row:hover,
.page-about .af-map__row:focus-visible {
  border-color: var(--c-gold);
  background: rgba(42, 26, 71, 0.72);
  transform: translateX(4px);
}

.page-about .af-map__row:focus-visible {
  outline: 2px solid var(--c-gold-hi);
  outline-offset: 2px;
}

.page-about .af-map__name {
  font-size: var(--fs-card);
  font-weight: 700;
  color: var(--c-gold-hi);
}

.page-about .af-map__desc {
  font-size: var(--fs-meta);
  line-height: 1.75;
  color: var(--c-muted);
}

@media (min-width: 700px) {
  .page-about .af-map__row {
    grid-template-columns: minmax(0, 12em) minmax(0, 1fr);
    gap: clamp(14px, 2vw, 26px);
    align-items: baseline;
  }
}

/* ---------- 右侧索引栏 ---------- */
.page-about .about-rail {
  order: -1;
  padding: clamp(16px, 2.2vw, 26px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  background: linear-gradient(172deg, rgba(42, 26, 71, 0.88), rgba(11, 6, 20, 0.88));
  box-shadow: var(--shadow-card);
}

.page-about .about-rail__title {
  margin: 0 0 0.9em;
  font-size: var(--fs-cap);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 14px;
}

.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  font-size: var(--fs-meta);
  line-height: 1.5;
  color: var(--c-muted);
  text-decoration: none;
  transition: color 0.24s ease;
}

.page-about .rail-link::before {
  content: "";
  flex: none;
  width: 10px;
  height: 1px;
  background: var(--c-line);
  transform: translateY(-3px);
  transition: width 0.24s ease, background 0.24s ease;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--c-paper);
}

.page-about .rail-link:focus-visible {
  outline: 2px solid var(--c-gold-hi);
  outline-offset: 2px;
}

.page-about .rail-link[aria-current="true"],
.page-about .rail-link.is-active {
  color: var(--c-gold-hi);
}

.page-about .rail-link[aria-current="true"]::before,
.page-about .rail-link.is-active::before {
  width: 22px;
  background: var(--c-gold);
}

.page-about .about-rail__no {
  font-size: var(--fs-cap);
  color: var(--c-gold);
  opacity: 0.8;
}

.page-about .about-rail__figures {
  padding-top: clamp(14px, 2vw, 20px);
  border-top: 1px solid var(--c-line);
}

.page-about .about-rail__figures-title {
  margin: 0 0 0.9em;
  font-size: var(--fs-cap);
  letter-spacing: 0.18em;
  color: var(--c-muted);
}

.page-about .about-rail__figs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 10px 16px;
}

.page-about .about-rail__figs li {
  display: grid;
  gap: 2px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(78, 62, 112, 0.6);
}

.page-about .about-rail__fig {
  display: block;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--c-paper);
  border-bottom: 1px solid var(--c-gold);
  padding-bottom: 4px;
  width: fit-content;
}

.page-about .about-rail__figcap {
  font-size: var(--fs-cap);
  line-height: 1.6;
  color: var(--c-muted);
}

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1.92fr) minmax(228px, 1fr);
    column-gap: clamp(30px, 4.2vw, 76px);
    align-items: start;
  }

  .page-about .about-layout__main {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-rail {
    grid-column: 2;
    grid-row: 1;
    order: 0;
    position: sticky;
    top: calc(var(--header-h) + 18px);
  }

  .page-about .about-rail__list {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-about .about-rail__figs {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

@media (min-width: 1240px) {
  .page-about .af-cards {
    column-gap: clamp(20px, 2.2vw, 30px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-item,
  .page-about .af-map__row,
  .page-about .rail-link::before,
  .page-about .tline__trigger {
    transition: none;
  }

  .page-about .team-item:hover,
  .page-about .team-item:focus-within,
  .page-about .af-map__row:hover,
  .page-about .af-map__row:focus-visible {
    transform: none;
  }
}