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

.page-about section[id] {
  scroll-margin-top: calc(var(--header-h) + 68px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 38px) 0 clamp(40px, 6vw, 68px);
  color: var(--paper);
  background:
    radial-gradient(112% 82% at 100% 0%, rgba(179, 37, 27, .34), transparent 62%),
    linear-gradient(172deg, var(--ink) 0%, var(--indigo-deep) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: var(--line-paper);
}

.page-about .about-hero__eyebrow {
  color: rgba(245, 240, 230, .62);
  margin: 0 0 18px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 50px);
  align-items: end;
  margin-top: clamp(20px, 3.2vw, 38px);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-narrow);
  font-size: clamp(2.05rem, 7.4vw, 4.15rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -.015em;
}

.page-about .about-hero__lead {
  max-width: 48ch;
  margin: 0;
  font-size: clamp(.98rem, 1.3vw, 1.1rem);
  line-height: 1.9;
  color: rgba(245, 240, 230, .8);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

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

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure .figure__media {
  border: 1px solid var(--line-paper);
}

.page-about .about-hero__figure .figure__cap {
  color: rgba(245, 240, 230, .55);
  font-size: .76rem;
  letter-spacing: .05em;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  list-style: none;
  margin: clamp(34px, 5vw, 56px) 0 0;
  padding: clamp(20px, 3vw, 28px) 0 0;
  border-top: 1px solid var(--line-paper);
}

.page-about .about-hero__stat-num {
  display: block;
  font-family: var(--font-narrow);
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.01em;
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 10px;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--stone-2);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index-bar {
  position: sticky;
  top: var(--header-h);
  z-index: 20;
  background: var(--paper-2);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index {
  display: flex;
  align-items: center;
  gap: 2px;
  min-width: max-content;
  padding: 0 var(--gutter);
}

.page-about .about-index .watch-nav__link {
  display: inline-block;
  padding: 13px 13px;
  font-size: .82rem;
  letter-spacing: .05em;
  color: var(--stone);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-index .watch-nav__link:hover,
.page-about .about-index .watch-nav__link:focus-visible {
  color: var(--ink);
}

.page-about .about-index .watch-nav__link.is-active,
.page-about .about-index .watch-nav__link[aria-current="true"] {
  color: var(--ink);
  font-weight: 700;
  border-bottom-color: var(--red);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec__intro {
  max-width: 62ch;
  margin: 22px 0 0;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--ink-soft);
}

/* ---------- 沿革 ---------- */
.page-about .about-term {
  list-style: none;
  margin: clamp(30px, 4.5vw, 52px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-2);
}

.page-about .about-term__item {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-term__year {
  font-family: var(--font-mono);
  font-size: .84rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--red);
  padding-top: 3px;
}

.page-about .about-term__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .about-term__body p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-term__figure {
  margin: clamp(34px, 5vw, 58px) 0 0;
}

/* ---------- 四类内容 ---------- */
.page-about .about-frames {
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .about-frame {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 20px 26px;
  background: var(--paper);
  border: 1px solid var(--line-2);
  border-top: 2px solid var(--indigo);
}

.page-about .about-frame .card__index {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--stone-2);
}

.page-about .about-frame .card__title {
  margin: 0;
  font-family: var(--font-narrow);
  font-size: 1.14rem;
  font-weight: 700;
}

.page-about .about-frame .card__body {
  margin: 0;
  font-size: .89rem;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-frames__foot {
  margin-top: clamp(24px, 3.5vw, 38px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-frames__note {
  margin: 0;
  font-size: .86rem;
  color: var(--stone);
}

.page-about .about-frames__note a {
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  padding-bottom: 1px;
}

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

.page-about .about-frames__note span {
  margin: 0 10px;
  color: var(--stone-2);
}

/* ---------- 区域档位 ---------- */
.page-about .about-tablewrap {
  margin-top: clamp(28px, 4vw, 44px);
  overflow-x: auto;
  border: 1px solid var(--line-2);
  background: var(--paper);
}

.page-about .about-table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
  font-size: .89rem;
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.page-about .about-table thead th {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--stone);
  background: var(--paper-2);
  border-bottom: 1px solid var(--line-2);
}

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

.page-about .about-table td:first-child {
  font-weight: 700;
}

.page-about .about-table td:nth-child(2) {
  font-family: var(--font-mono);
  color: var(--stone);
  font-size: .82rem;
}

.page-about .about-table td:last-child {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--indigo);
}

/* ---------- 编号规则 ---------- */
.page-about .about-code {
  display: grid;
  gap: clamp(28px, 4.5vw, 54px);
  align-items: center;
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-code__text p {
  margin: 0 0 18px;
  font-size: .96rem;
  line-height: 1.95;
  color: var(--ink-soft);
}

.page-about .about-code__sample {
  margin: 26px 0 20px !important;
  padding: 20px 22px;
  background: var(--ink);
  color: var(--paper);
  border-left: 3px solid var(--red);
}

.page-about .about-code__sample .mono {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2.6vw, 1.6rem);
  font-weight: 700;
  letter-spacing: .12em;
}

.page-about .about-code__parts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-code__parts li {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-code__part-key {
  font-family: var(--font-mono);
  font-size: .84rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--red);
}

.page-about .about-code__part-val {
  font-size: .88rem;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-code__figure {
  margin: 0;
}

/* ---------- 查阅维度 ---------- */
.page-about .about-axis {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 4vw, 46px);
  background: var(--line-2);
  border: 1px solid var(--line-2);
}

.page-about .about-axis__col {
  position: relative;
  padding: 26px 22px 30px;
  background: var(--paper);
}

.page-about .about-axis__idx {
  display: inline-block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--paper);
  background: var(--indigo);
  padding: 3px 8px;
}

.page-about .about-axis__col h3 {
  margin: 0 0 12px;
  font-family: var(--font-narrow);
  font-size: 1.2rem;
  font-weight: 700;
}

.page-about .about-axis__col p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.9;
  color: var(--stone);
}

.page-about .about-axis__col--wide .about-axis__idx {
  background: var(--red);
}

/* ---------- 联络与边界 ---------- */
.page-about .about-contact {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-contact__intro p {
  margin: 0 0 18px;
  font-size: .96rem;
  line-height: 1.95;
  color: var(--ink-soft);
}

.page-about .about-contact__ledger {
  margin: 0;
}

.page-about .about-contact__ledger .ledger__row dt {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--stone);
}

.page-about .about-contact__foot {
  display: flex;
  flex-direction: column;
  gap: 22px;
  margin-top: clamp(30px, 4.5vw, 50px);
  padding-top: 24px;
  border-top: 1px solid var(--line-2);
}

.page-about .about-contact__note {
  margin: 0;
  font-size: .88rem;
  line-height: 1.85;
  color: var(--stone);
}

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

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-axis {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-axis__col--wide {
    grid-column: 1 / -1;
  }

  .page-about .about-contact__foot {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-contact__note {
    max-width: 58ch;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, .84fr);
  }

  .page-about .about-term {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 clamp(18px, 2.4vw, 30px);
    border-top: 0;
  }

  .page-about .about-term__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
    padding: 20px 0 0;
    border-bottom: 0;
    border-top: 2px solid var(--ink);
    position: relative;
  }

  .page-about .about-term__item::before {
    content: "";
    position: absolute;
    top: -6px;
    left: 0;
    width: 9px;
    height: 9px;
    background: var(--red);
    transform: rotate(45deg);
  }

  .page-about .about-code {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
  }

  .page-about .about-contact {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-axis {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-axis__col--wide {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index .watch-nav__link {
    transition: none;
  }
}
<<<END>>>