.page-about {
  --about-line: 1px solid rgba(201, 162, 75, .26);
  --about-pad: clamp(16px, 3.6vw, 28px);
  --about-space: clamp(44px, 7vw, 88px);
  color: var(--paper);
  background:
    radial-gradient(900px 460px at 88% -10%, rgba(23, 38, 66, .95), rgba(14, 24, 48, 0) 72%),
    var(--ink);
  overflow-wrap: break-word;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about a:focus-visible,
.page-about button:focus-visible,
.page-about [tabindex="0"]:focus-visible {
  outline: 2px solid var(--gold-light);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 46px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.85rem, 6.2vw, 3.05rem);
  line-height: 1.24;
  letter-spacing: .05em;
  color: var(--paper);
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: clamp(56px, 14vw, 112px);
  height: 3px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--gold), rgba(201, 162, 75, 0));
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: clamp(.94rem, 2.3vw, 1.02rem);
  line-height: 1.9;
  color: rgba(242, 237, 227, .82);
}

.page-about .about-hero__meta {
  margin: 26px 0 0;
  padding: 18px 0 0;
  list-style: none;
  display: grid;
  gap: 11px;
  border-top: var(--about-line);
}

.page-about .about-hero__meta li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
}

.page-about .about-hero__metaKey {
  min-width: 8.2em;
  font-size: .76rem;
  letter-spacing: .16em;
  color: var(--stone);
}

.page-about .about-hero__metaVal {
  font-size: .98rem;
  letter-spacing: .04em;
  color: var(--gold-light);
}

.page-about .about-hero__actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__figure {
  margin: 0;
  border: var(--edge);
  box-shadow: var(--shadow-2);
  background: var(--ink-panel);
}

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

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  margin-top: var(--about-space);
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

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

/* ---------- 索引轨道 ---------- */
.page-about .about-index {
  border-left: 2px solid rgba(201, 162, 75, .55);
  padding-left: 14px;
  min-width: 0;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .24em;
  color: var(--stone);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid rgba(110, 127, 141, .42);
  font-size: .84rem;
  color: rgba(242, 237, 227, .78);
  text-decoration: none;
  transition: color .12s ease, background-color .12s ease, border-color .12s ease;
}

.page-about .about-index__num {
  font-size: .72rem;
  color: var(--gold);
  letter-spacing: .1em;
}

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

.page-about .about-index__link[aria-current="true"] {
  color: var(--gold-light);
  border-color: var(--gold);
  background: rgba(201, 162, 75, .13);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-top: clamp(30px, 5vw, 54px);
  border-top: var(--about-line);
}

.page-about .about-content > .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 7vw, 3.3rem);
  line-height: .9;
  letter-spacing: .06em;
  color: rgba(201, 162, 75, .14);
  -webkit-text-stroke: 1px rgba(201, 162, 75, .7);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.22rem, 3.6vw, 1.68rem);
  line-height: 1.45;
  letter-spacing: .06em;
  color: var(--paper);
}

.page-about .about-chapter__lede {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: .95rem;
  line-height: 1.92;
  color: rgba(242, 237, 227, .8);
}

.page-about .about-chapter__lede a,
.page-about .about-chapter__note a,
.page-about .about-contact a {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 201, 122, .5);
}

.page-about .about-chapter__lede a:hover,
.page-about .about-chapter__note a:hover,
.page-about .about-contact a:hover {
  border-bottom-color: var(--gold-light);
}

.page-about .about-chapter__note {
  margin: 16px 0 0;
  font-size: .86rem;
  line-height: 1.85;
  color: rgba(159, 189, 184, .92);
}

.page-about .about-chapter__link {
  margin: 22px 0 0;
}

.page-about .about-chapter__link a {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 75, .55);
  padding-bottom: 3px;
}

.page-about .about-chapter__link a:hover {
  color: var(--gold-light);
  border-bottom-color: var(--gold-light);
}

.page-about .about-chapter__close {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  font-family: var(--font-serif);
  font-size: .95rem;
  line-height: 1.9;
  letter-spacing: .04em;
  color: rgba(242, 237, 227, .88);
}

/* ---------- 档案卡片 ---------- */
.page-about .about-cards {
  margin-top: 24px;
  display: grid;
  gap: 14px;
}

.page-about .about-card {
  padding: var(--about-pad);
  background: var(--ink-panel);
  border: var(--edge);
  box-shadow: var(--shadow-1);
  transition: transform .12s ease, box-shadow .12s ease, background-color .12s ease;
}

.page-about .about-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  background: #1a2b4a;
}

.page-about .about-card__title {
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 1.02rem;
  letter-spacing: .06em;
  color: var(--paper);
}

.page-about .about-card__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  font-size: .74rem;
  color: var(--ink);
  background: var(--gold);
}

.page-about .about-card__text {
  margin: 0;
  font-size: .89rem;
  line-height: 1.85;
  color: rgba(242, 237, 227, .78);
}

/* ---------- 适用对象 ---------- */
.page-about .about-audience {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-audience__item {
  padding: 16px 18px;
  border-left: 3px solid var(--stone);
  background: linear-gradient(90deg, rgba(23, 38, 66, .92), rgba(14, 24, 48, 0));
  transition: transform .12s ease, border-color .12s ease;
}

.page-about .about-audience__item:hover {
  transform: translateX(3px);
}

.page-about .about-audience__item--mint { border-left-color: var(--mist); }
.page-about .about-audience__item--moss { border-left-color: var(--moss); }
.page-about .about-audience__item--sand { border-left-color: var(--sand); }

.page-about .about-audience__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: .98rem;
  letter-spacing: .07em;
  color: var(--paper);
}

.page-about .about-audience__text {
  margin: 0;
  font-size: .88rem;
  line-height: 1.85;
  color: rgba(242, 237, 227, .76);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
  border: var(--edge);
  box-shadow: var(--shadow-1);
  background: var(--ink-sub);
}

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

.page-about .about-figure--narrow {
  max-width: 620px;
}

/* ---------- 编号表 ---------- */
.page-about .about-ledger {
  margin: 24px 0 0;
  border-top: var(--about-line);
}

.page-about .about-ledger__row {
  display: grid;
  gap: 6px 20px;
  padding: 15px 0;
  border-bottom: var(--about-line);
}

.page-about .about-ledger__key {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .about-ledger__val {
  margin: 0;
  font-size: .91rem;
  line-height: 1.88;
  color: rgba(242, 237, 227, .8);
}

.page-about .about-copy {
  margin-top: 22px;
  padding: 16px 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  border: 1px dashed rgba(201, 162, 75, .55);
  background: rgba(23, 38, 66, .8);
}

.page-about .about-copy__label {
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--stone);
}

.page-about .about-copy__code {
  font-size: .92rem;
  letter-spacing: .06em;
  color: var(--gold-light);
}

.page-about .about-copy__btn {
  margin-left: auto;
}

/* ---------- 更新节奏刻度 ---------- */
.page-about .about-ruler {
  margin-top: 26px;
  height: 58px;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  align-items: end;
  gap: 4px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(201, 162, 75, .5);
}

.page-about .about-ruler span {
  display: block;
  height: 26%;
  background: linear-gradient(180deg, rgba(201, 162, 75, .85), rgba(201, 162, 75, .1));
}

.page-about .about-ruler span:nth-child(3n) {
  height: 62%;
}

.page-about .about-ruler span:nth-child(4n) {
  height: 100%;
  background: linear-gradient(180deg, var(--gold-light), rgba(201, 162, 75, .18));
}

.page-about .about-ruler__note {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--stone);
}

/* ---------- 团队 ---------- */
.page-about .about-roles {
  margin-top: 22px;
  display: grid;
  gap: 16px;
}

.page-about .about-role {
  padding-top: 12px;
  border-top: 2px solid var(--stone);
}

.page-about .about-role--moss { border-top-color: var(--moss); }
.page-about .about-role--gold { border-top-color: var(--gold); }
.page-about .about-role--sand { border-top-color: var(--sand); }

.page-about .about-role__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: .96rem;
  letter-spacing: .07em;
  color: var(--paper);
}

.page-about .about-role__text {
  margin: 0;
  font-size: .87rem;
  line-height: 1.85;
  color: rgba(242, 237, 227, .76);
}

.page-about .about-contact {
  margin-top: 24px;
  padding: var(--about-pad);
  border: var(--edge);
  border-left: 4px solid var(--gold);
  background: var(--ink-panel);
  box-shadow: var(--shadow-1);
}

.page-about .about-contact__line {
  margin: 0 0 6px;
  font-size: .89rem;
  line-height: 1.8;
  color: rgba(242, 237, 227, .78);
}

.page-about .about-contact__val {
  font-size: .94rem;
  letter-spacing: .04em;
  color: var(--gold-light);
}

.page-about .about-contact__val--mail {
  font-family: var(--font-mono);
  font-size: .84rem;
  word-break: break-all;
}

.page-about .about-contact__hint {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: var(--about-line);
  font-size: .84rem;
  line-height: 1.8;
  color: rgba(159, 189, 184, .92);
}

/* ---------- 发展阶段 ---------- */
.page-about .about-stages {
  list-style: none;
  margin: 24px 0 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .about-stages::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(201, 162, 75, .12));
}

.page-about .about-stage {
  position: relative;
  padding: 14px 16px;
  border: 1px solid rgba(110, 127, 141, .34);
  background: rgba(23, 38, 66, .55);
  transition: transform .12s ease, border-color .12s ease, background-color .12s ease;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 24px;
  width: 14px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-stage:hover,
.page-about .about-stage:focus-visible {
  transform: translateX(3px);
  border-color: var(--gold);
  background: rgba(23, 38, 66, .95);
}

.page-about .about-stage__label {
  margin: 0 0 6px;
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-stage__title {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: .96rem;
  letter-spacing: .06em;
  color: var(--paper);
}

.page-about .about-stage__text {
  margin: 0;
  font-size: .87rem;
  line-height: 1.85;
  color: rgba(242, 237, 227, .76);
}

/* ---------- 出口 ---------- */
.page-about .about-exits {
  margin-top: var(--about-space);
  padding-top: clamp(26px, 4vw, 42px);
  border-top: var(--about-line);
}

.page-about .about-exits__title {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 3vw, 1.3rem);
  letter-spacing: .08em;
  color: var(--paper);
}

.page-about .about-exits__grid {
  display: grid;
  gap: 12px;
}

.page-about .about-exit {
  display: block;
  padding: 18px 20px;
  text-decoration: none;
  background: rgba(23, 38, 66, .72);
  border: var(--edge);
  box-shadow: var(--shadow-1);
  transition: transform .12s ease, box-shadow .12s ease, background-color .12s ease;
}

.page-about .about-exit:hover,
.page-about .about-exit:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  background: rgba(23, 38, 66, 1);
}

.page-about .about-exit__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-serif);
  font-size: .98rem;
  letter-spacing: .08em;
  color: var(--gold-light);
}

.page-about .about-exit__text {
  display: block;
  font-size: .85rem;
  line-height: 1.8;
  color: rgba(242, 237, 227, .74);
}

@media (min-width: 760px) {
  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-card:first-child {
    grid-column: span 2;
  }

  .page-about .about-ledger__row {
    grid-template-columns: 148px minmax(0, 1fr);
    align-items: baseline;
  }

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

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-index {
    position: sticky;
    top: 150px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
  }

  .page-about .about-index__link {
    width: 100%;
    justify-content: flex-start;
    white-space: normal;
  }

  .page-about .about-exits__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-card:first-child {
    grid-column: span 1;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-audience__item,
  .page-about .about-stage,
  .page-about .about-exit,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-audience__item:hover,
  .page-about .about-stage:hover,
  .page-about .about-exit:hover {
    transform: none;
  }
}