.page-about {
  --about-gold-line: rgba(217, 164, 65, .55);
  --about-veil: rgba(11, 16, 24, .74);
  --about-red-wash: rgba(179, 36, 43, .10);
  display: block;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(24px, 4vw, 48px) 0 clamp(40px, 7vw, 84px);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .32;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 16, 24, .38) 0%, var(--about-veil) 56%, var(--ink) 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb,
.page-about .about-hero .breadcrumb a {
  color: var(--paper-60);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .04em;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(22px, 3.6vw, 40px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-size: clamp(30px, 6.4vw, 68px);
  line-height: 1.06;
  letter-spacing: -.03em;
  font-weight: 800;
}

.page-about .about-hero__mark {
  color: var(--gold-lit);
}

.page-about .about-hero__p {
  max-width: 48ch;
  margin: 18px 0 0;
  color: var(--paper-70);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-hero__facts {
  border: 1px solid var(--line-on-ink);
  background: rgba(27, 36, 49, .76);
  padding: clamp(18px, 3vw, 28px);
}

.page-about .about-hero__factsTitle {
  margin: 0 0 16px;
  font-size: var(--fs-16);
  color: var(--paper-60);
  letter-spacing: .02em;
}

.page-about .about-hero__dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin: 0;
}

.page-about .about-hero__row {
  border-top: 1px solid var(--line-on-ink);
  padding-top: 10px;
}

.page-about .about-hero__dt {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--paper-40);
}

.page-about .about-hero__dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  color: var(--gold-lit);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
}

.page-about .about-hero__unit {
  font-family: var(--font-sans);
  font-size: var(--fs-12);
  color: var(--paper-40);
  letter-spacing: .02em;
  margin-left: 4px;
}

/* ---------- 通用区块 ---------- */
.page-about .section {
  padding-block: clamp(40px, 6vw, 84px);
}

.page-about h2 {
  margin: 12px 0 0;
  font-family: var(--font-sans);
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -.02em;
  font-weight: 800;
}

.page-about .about-sub {
  margin: 10px 0 0;
  font-size: var(--fs-16);
  color: var(--mute);
  letter-spacing: .01em;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--paper-2);
}

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

.page-about .about-figure__cap {
  padding: 10px 14px 12px;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--mute);
  border-top: 1px solid var(--line);
}

/* ---------- 会馆是做什么的 ---------- */
.page-about .about-intro__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-intro__card {
  position: relative;
  border: 1px solid var(--line);
  border-top: 3px solid var(--ink);
  background: var(--paper-2);
  padding: clamp(20px, 3vw, 30px);
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .about-intro__card:hover {
  border-color: var(--red);
  border-top-color: var(--red);
}

.page-about .about-intro__card--wide {
  border-top-color: var(--jade);
}

.page-about .about-intro__card--wide:hover {
  border-top-color: var(--jade);
}

.page-about .about-intro__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--mute);
}

.page-about .about-intro__h {
  margin: 10px 0 0;
  font-family: var(--font-sans);
  font-size: clamp(17px, 2.4vw, 20px);
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-intro__p {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl-head {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-figure--band {
  margin-bottom: clamp(26px, 4vw, 42px);
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--about-gold-line) 55%, rgba(217, 164, 65, .1) 100%);
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 clamp(24px, 3.4vw, 36px) 30px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper-2);
  border: 2px solid var(--gold);
  box-sizing: border-box;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-about .about-tl__item:hover::before {
  background: var(--red);
  border-color: var(--red-deep);
  box-shadow: 0 0 0 4px var(--about-red-wash);
}

.page-about .about-tl__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl__item:hover .about-tl__year {
  color: var(--red);
}

.page-about .about-tl__h {
  margin: 4px 0 0;
  font-family: var(--font-sans);
  font-size: var(--fs-16);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-tl__p {
  margin: 8px 0 0;
  max-width: 60ch;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-tl__flag {
  display: inline-block;
  margin-top: 10px;
  padding: 2px 9px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--jade);
  background: var(--paper);
}

/* ---------- 团队 ---------- */
.page-about .about-crew__bands {
  display: grid;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-crew__band {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  border-top: 3px solid var(--red);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-crew__band--ink {
  background: var(--ink);
  color: var(--paper);
  border-top-color: var(--red);
}

.page-about .about-crew__band--mid {
  background: var(--ink-2);
  color: var(--paper);
  border-top-color: var(--gold);
}

.page-about .about-crew__band--light {
  background: var(--paper-2);
  color: var(--ink);
  border-top-color: var(--jade);
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-crew__h {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-14);
  font-weight: 800;
  letter-spacing: .08em;
}

.page-about .about-crew__n {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(44px, 8vw, 68px);
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--gold-lit);
}

.page-about .about-crew__band--light .about-crew__n {
  color: var(--ink);
}

.page-about .about-crew__unit {
  font-family: var(--font-sans);
  font-size: var(--fs-14);
  margin-left: 6px;
  letter-spacing: .04em;
  opacity: .7;
}

.page-about .about-crew__list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
  font-size: var(--fs-14);
  line-height: 1.75;
}

.page-about .about-crew__list li {
  position: relative;
  padding-left: 14px;
}

.page-about .about-crew__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 6px;
  height: 1px;
  background: currentColor;
  opacity: .55;
}

.page-about .about-crew__handoff {
  margin-top: clamp(20px, 3vw, 32px);
  border-left: 2px solid var(--gold);
  padding: 2px 0 2px clamp(14px, 2vw, 22px);
}

.page-about .about-crew__handoffT {
  margin: 0;
  font-size: var(--fs-16);
  color: var(--ink);
}

.page-about .about-crew__steps {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: none;
}

.page-about .about-crew__step {
  display: flex;
  gap: 10px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-2);
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.page-about .about-crew__step .num {
  font-family: var(--font-mono);
  color: var(--red);
  font-weight: 600;
  flex: none;
}

/* ---------- 季度复盘 ---------- */
.page-about .about-cycle {
  background: var(--ink);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-cycle h2 {
  color: var(--paper);
}

.page-about .about-cycle__lead {
  max-width: 62ch;
  margin: 14px 0 0;
  font-size: var(--fs-14);
  line-height: 1.9;
  color: var(--paper-70);
}

.page-about .about-cycle__band {
  margin-top: clamp(24px, 3.6vw, 40px);
  margin-right: calc(var(--gutter) * -1);
  padding: clamp(20px, 3vw, 32px) clamp(18px, 3vw, 32px);
  background: linear-gradient(100deg, rgba(179, 36, 43, .26) 0%, rgba(217, 164, 65, .12) 46%, rgba(46, 110, 98, .18) 100%);
  border: 1px solid var(--line-on-ink);
  border-right: 0;
}

.page-about .about-cycle__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
}

.page-about .about-cycle__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 28px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--gold-lit);
  font-variant-numeric: tabular-nums;
}

.page-about .about-cycle__label {
  margin: 6px 0 0;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--paper-60);
}

.page-about .about-cycle__flow {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-on-ink);
  border: 1px solid var(--line-on-ink);
}

.page-about .about-cycle__step {
  background: var(--ink-2);
  padding: clamp(16px, 2.4vw, 24px);
}

.page-about .about-cycle__stepNum {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-cycle__stepT {
  margin: 8px 0 0;
  font-family: var(--font-sans);
  font-size: var(--fs-16);
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-cycle__stepP {
  margin: 6px 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--paper-60);
}

/* ---------- 会馆空间 ---------- */
.page-about .about-space__grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .about-space__list {
  display: grid;
  gap: 0;
}

.page-about .about-space__item {
  border-top: 1px solid var(--line);
  padding: 14px 0 18px;
}

.page-about .about-space__item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-space__h {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-16);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-space__h::before {
  content: "";
  display: inline-block;
  width: 16px;
  height: 2px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--jade);
}

.page-about .about-space__p {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-visit {
  margin-top: clamp(24px, 3.4vw, 38px);
  border: 1px solid var(--line);
  background: var(--paper);
  padding: clamp(18px, 3vw, 30px);
  display: grid;
  gap: 20px;
}

.page-about .about-visit__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--red);
}

.page-about .about-visit__value {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-visit__value--addr {
  font-family: var(--font-serif);
  font-size: var(--fs-16);
  color: var(--ink);
  letter-spacing: .01em;
}

.page-about .about-visit__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .about-visit__contact .copy-btn {
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .about-visit__contact .copy-btn:hover {
  border-color: var(--jade);
}

.page-about .about-visit__contact .copy-btn[data-copy-state="ok"] {
  border-color: var(--jade);
  background: rgba(46, 110, 98, .08);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__grid {
  margin-top: clamp(22px, 3.2vw, 34px);
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--paper-2);
  padding: clamp(18px, 2.6vw, 28px);
  text-decoration: none;
  color: var(--ink);
  transition: background var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--paper);
  box-shadow: inset 3px 0 0 var(--red);
}

.page-about .about-next__k {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--mute);
}

.page-about .about-next__t {
  font-family: var(--font-sans);
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-next__d {
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-next__go {
  margin-top: auto;
  padding-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--red);
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .about-next__link:hover .about-next__go {
  border-bottom-color: var(--red);
}

/* ---------- 返回首层 ---------- */
.page-about .about-return {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 40;
  padding: 9px 13px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--line-on-ink);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(11, 16, 24, .22);
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-return:hover,
.page-about .about-return:focus-visible {
  background: var(--red-deep);
  border-color: var(--red);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-intro__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 0 22px;
    padding-left: 40px;
  }

  .page-about .about-tl__item::before {
    top: 10px;
  }

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

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

  .page-about .about-next__grid {
    grid-template-columns: 1.15fr 1fr .9fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-hero__facts {
    margin-bottom: clamp(0px, 2vw, 26px);
  }

  .page-about .about-crew__bands {
    grid-template-columns: 1.45fr 1fr .85fr;
    align-items: stretch;
  }

  .page-about .about-crew__handoff {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 0 24px;
    align-items: start;
  }

  .page-about .about-crew__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-top: 0;
  }

  .page-about .about-crew__step {
    border-top: 1px solid var(--line);
    padding-top: 12px;
  }

  .page-about .about-space__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-visit {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-visit__contact {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-about .about-intro__grid {
    grid-template-columns: 1.15fr 1fr;
  }

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

  .page-about .about-tl__item {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 0 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-intro__card,
  .page-about .about-tl__item::before,
  .page-about .about-tl__year,
  .page-about .about-next__link,
  .page-about .about-next__go,
  .page-about .about-return,
  .page-about .about-visit__contact .copy-btn {
    transition: none;
  }
}
<<<END>>>