.page-about {
  --about-rail-w: 248px;
  --about-space: clamp(26px, 4vw, 52px);
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(0deg, rgba(185, 198, 190, 0.18) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(90deg, rgba(185, 198, 190, 0.12) 0 1px, transparent 1px 46px);
  color: var(--charcoal);
  font-family: var(--sans);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background-image: linear-gradient(158deg, var(--ink-green) 0%, #123f34 58%, var(--forest) 100%);
  color: var(--paper);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-hero__crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(247, 243, 234, 0.72);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-hero__crumb a {
  color: rgba(247, 243, 234, 0.86);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

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

.page-about .about-hero__crumb span[aria-hidden="true"] {
  color: rgba(200, 164, 93, 0.6);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero .hall-kicker {
  color: var(--gold);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  margin: 0 0 16px;
}

.page-about .about-hero h1 {
  font-family: var(--serif);
  font-size: clamp(32px, 5.4vw, 60px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: 0.02em;
  margin: 0 0 22px;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: 40em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: #e6ecE6;
}

.page-about .about-hero__intro + .about-hero__intro {
  margin-top: 14px;
}

.page-about .about-hero__intro--soft {
  color: rgba(228, 234, 227, 0.78);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(200, 164, 93, 0.45);
}

.page-about .about-hero__stat dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(228, 234, 227, 0.7);
  margin-bottom: 8px;
}

.page-about .about-hero__stat dd {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  line-height: 1.2;
  overflow-wrap: break-word;
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid rgba(200, 164, 93, 0.55);
  background-color: var(--forest);
  padding: 8px;
}

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

.page-about .about-hero__caption {
  display: block;
  padding: 12px 6px 4px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(228, 234, 227, 0.82);
  letter-spacing: 0.04em;
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  padding: clamp(48px, 7vw, 104px) 0 clamp(56px, 8vw, 112px);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-space);
  align-items: start;
}

/* ---------- 左侧索引 ---------- */
.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold-deep);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  position: relative;
}

.page-about .about-rail__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  background-color: rgba(255, 255, 255, 0.55);
  color: var(--charcoal);
  text-decoration: none;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--gold);
  background-color: var(--white);
}

.page-about .about-rail__no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gold-deep);
  letter-spacing: 0.04em;
}

.page-about .about-rail__label {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-green);
  line-height: 1.4;
}

.page-about .about-rail__note {
  display: none;
  grid-column: 2;
  font-size: 12px;
  line-height: 1.5;
  color: #5b665f;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter + .about-chapter {
  margin-top: clamp(44px, 6vw, 76px);
  padding-top: clamp(40px, 6vw, 72px);
  border-top: 1px solid var(--line);
}

.page-about .about-chapter__no {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold-deep);
  margin-bottom: 12px;
}

.page-about .about-chapter h2 {
  font-family: var(--serif);
  font-size: clamp(23px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1.36;
  letter-spacing: 0.02em;
  color: var(--ink-green);
  margin: 0;
}

.page-about .about-chapter__lead {
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--gold);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: #3b443f;
}

.page-about .about-chapter__body {
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-chapter__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: #333b36;
}

.page-about .about-chapter__body p + p {
  margin-top: 16px;
}

.page-about .about-chapter__body > .about-plate,
.page-about .about-chapter__body > .about-model {
  margin-top: 26px;
  margin-bottom: 26px;
}

.page-about .text-link {
  color: var(--gold-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--ink-green);
  border-bottom-color: var(--ink-green);
}

/* 引文块 */
.page-about .about-quote {
  margin: 28px 0 0;
  padding: 24px clamp(20px, 3vw, 30px);
  background-color: var(--sage);
  border-left: 4px solid var(--ink-green);
  font-family: var(--serif);
  font-size: clamp(18px, 2.3vw, 23px);
  font-weight: 600;
  line-height: 1.68;
  letter-spacing: 0.02em;
  color: var(--ink-green);
}

/* 三层模型图 */
.page-about .about-model {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background-color: var(--white);
}

.page-about .about-model text {
  font-family: var(--sans);
}

.page-about .about-model__name {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .about-model__desc {
  font-size: 13px;
  letter-spacing: 0.02em;
}

.page-about .about-model__num {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.06em;
}

/* 十二类入口 */
.page-about .about-doors {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-doors li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 10px;
  align-items: baseline;
  padding: 13px 14px;
  background-color: var(--paper);
  transition: background-color 180ms var(--ease);
}

.page-about .about-doors li:hover {
  background-color: var(--white);
}

.page-about .about-doors__no {
  grid-row: 1 / 3;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gold-deep);
  align-self: center;
}

.page-about .about-doors__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-green);
  line-height: 1.5;
}

.page-about .about-doors__desc {
  grid-column: 2;
  font-size: 12px;
  line-height: 1.6;
  color: #5b665f;
}

.page-about .about-bands {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-bands li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  line-height: 1.6;
  color: #3b443f;
}

/* 版本卡片 */
.page-about .about-versions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-version {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  background-color: var(--white);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-version:hover {
  border-color: var(--gold);
}

.page-about .about-version--current {
  border: 2px solid var(--gold);
  background-image: linear-gradient(180deg, #fffdf6 0%, var(--white) 70%);
}

.page-about .about-version__no {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold-deep);
}

.page-about .about-version h3 {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-green);
}

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

.page-about .about-version__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: #3b443f;
}

.page-about .about-version__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background-color: var(--gold);
}

/* 版本册图 */
.page-about .about-plate {
  margin: 26px 0;
  border: 1px solid var(--line);
  background-color: var(--sage);
  padding: 8px;
}

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

.page-about .about-plate figcaption {
  padding: 12px 6px 4px;
  font-size: 13px;
  line-height: 1.7;
  color: #4a544e;
}

/* 分区 */
.page-about .about-chapter__body--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 32px);
  align-items: start;
}

.page-about .about-zones {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-zones li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.7;
  color: #333b36;
  transition: background-color 180ms var(--ease);
}

.page-about .about-zones li:hover {
  background-color: rgba(255, 255, 255, 0.7);
}

.page-about .about-zones__no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gold-deep);
  padding-top: 4px;
}

.page-about .about-zones strong {
  color: var(--ink-green);
  font-weight: 600;
}

.page-about .about-corridor {
  margin: 0;
  border: 1px solid var(--line);
  padding: 8px;
  background-color: var(--white);
}

.page-about .about-corridor img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
}

.page-about .about-corridor figcaption {
  padding: 12px 6px 4px;
  font-size: 13px;
  line-height: 1.7;
  color: #4a544e;
}

/* 服务原则 */
.page-about .about-rules {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-rule {
  padding: 22px 20px;
  background-color: var(--paper);
  transition: background-color 180ms var(--ease);
}

.page-about .about-rule:hover {
  background-color: var(--white);
}

.page-about .about-rule h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-green);
  letter-spacing: 0.02em;
}

.page-about .about-rule p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #3b443f;
}

/* 引导条 */
.page-about .about-next {
  margin-top: clamp(30px, 4vw, 44px);
  padding: clamp(22px, 3vw, 30px);
  background-color: var(--ink-green);
  color: var(--paper);
}

.page-about .about-next__title {
  margin: 0 0 16px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-next__note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.82);
}

.page-about .about-next__note .text-link {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .about-next__note .text-link:hover,
.page-about .about-next__note .text-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-doors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-version--current {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-chapter__body--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 260px);
  }

  .page-about .about-versions {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 0.92fr) minmax(0, 1.24fr);
  }

  .page-about .about-version--current {
    grid-column: auto;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-rail__list {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 21px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background-color: var(--line);
  }

  .page-about .about-rail__link {
    grid-template-columns: auto minmax(0, 1fr);
    border-color: transparent;
    background-color: transparent;
    padding: 10px 12px 10px 8px;
    border-left: 2px solid transparent;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-color: var(--gold);
    border-left-color: var(--gold);
    background-color: var(--white);
  }

  .page-about .about-rail__no {
    display: grid;
    place-items: center;
    width: 28px;
    height: 28px;
    border: 1px solid var(--gold);
    background-color: var(--paper);
    font-size: 11px;
  }

  .page-about .about-rail__note {
    display: block;
    margin-top: 2px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__figure {
    padding: 10px;
  }
}
<<<END>>>