.page-about {
  --about-rail: 19px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 34px) 0 clamp(42px, 7vw, 72px);
  color: var(--warm-white);
  background:
    radial-gradient(115% 88% at 88% -6%, rgba(18, 62, 58, .96) 0%, rgba(11, 43, 36, 0) 64%),
    linear-gradient(180deg, var(--ink-green-deep) 0%, var(--ink-green) 68%, var(--ink-green) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(135deg, rgba(185, 133, 62, .06) 0 1px, transparent 1px 10px);
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

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

.page-about .about-hero .breadcrumb li span,
.page-about .about-hero .breadcrumb li {
  color: rgba(243, 235, 221, .62);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 46px);
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-hero__kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: .34em;
  color: var(--bronze-lit);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7vw, 60px);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--warm-white);
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 32em;
  font-size: clamp(15px, 2.1vw, 17px);
  line-height: 1.92;
  color: rgba(243, 235, 221, .82);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 15px;
  border: 1px solid rgba(185, 133, 62, .42);
  border-radius: var(--r-pill);
  background: rgba(7, 29, 24, .5);
}

.page-about .about-hero__facts .mono {
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--bronze-lit);
}

.page-about .about-hero__facts em {
  font-style: normal;
  font-size: 12.5px;
  color: var(--paper-grey);
}

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

.page-about .about-hero__figure .media-frame,
.page-about .about-crew .media-frame,
.page-about .phase__figure .media-frame {
  background: var(--felt-teal);
}

.page-about .about-hero .media-frame__caption {
  color: rgba(243, 235, 221, .6);
}

/* ---------- 区块标题（含竖排注释） ---------- */
.page-about .about-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-head h2 {
  grid-column: 1;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1.22;
  letter-spacing: .02em;
  color: var(--ink-green);
}

.page-about .about-head__sub {
  grid-column: 1;
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.88;
  color: var(--text-soft);
}

/* ---------- 历程主轴 ---------- */
.page-about .about-track {
  background: var(--warm-white);
  color: var(--ink-black);
}

.page-about .phase-track {
  position: relative;
  list-style: none;
  margin: clamp(24px, 4.6vw, 42px) 0 0;
  padding: 0;
}

.page-about .phase-track::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: calc(var(--about-rail) - .5px);
  width: 1px;
  background: linear-gradient(180deg,
    rgba(185, 133, 62, 0) 0%,
    var(--bronze) 7%,
    var(--bronze) 92%,
    rgba(185, 133, 62, 0) 100%);
}

.page-about .phase {
  position: relative;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  column-gap: 14px;
  padding-bottom: 30px;
}

.page-about .phase:last-child {
  padding-bottom: 4px;
}

.page-about .phase__num {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--bronze);
  background: var(--ink-green);
  color: var(--bronze-lit);
  font-size: 11px;
  letter-spacing: .06em;
  transition: background-color .22s var(--ease-soft), color .22s var(--ease-soft), transform .22s var(--ease-soft);
}

.page-about .phase__body {
  padding-top: 3px;
  min-width: 0;
}

.page-about .phase h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.8vw, 25px);
  line-height: 1.36;
  letter-spacing: .015em;
  color: var(--ink-green);
}

.page-about .phase__ver {
  display: inline-block;
  margin-left: 9px;
  padding: 1px 10px;
  border: 1px solid rgba(18, 62, 58, .3);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: .05em;
  color: var(--felt-teal);
  vertical-align: 3px;
}

.page-about .phase__text {
  margin: 10px 0 0;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--text-soft);
}

.page-about .phase__more {
  margin-top: 13px;
}

.page-about .phase__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 15px 6px 12px;
  list-style: none;
  cursor: pointer;
  border: 1px solid var(--paper-grey);
  border-radius: var(--r-pill);
  background: rgba(216, 207, 191, .3);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--felt-teal);
  transition: border-color .22s var(--ease-soft), background-color .22s var(--ease-soft), color .22s var(--ease-soft);
}

.page-about .phase__more summary::-webkit-details-marker {
  display: none;
}

.page-about .phase__more summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--bronze);
}

.page-about .phase__more[open] summary::before {
  content: "–";
}

.page-about .phase__more summary:hover {
  border-color: var(--bronze);
  background: rgba(185, 133, 62, .14);
  color: var(--ink-green);
}

.page-about .phase__more summary:focus-visible {
  outline: 2px solid var(--bronze-lit);
  outline-offset: 3px;
}

.page-about .phase__keys {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 15px 0 3px;
}

.page-about .phase__figure {
  margin: 20px 0 0;
  max-width: 520px;
}

.page-about .phase:hover .phase__num,
.page-about .phase:focus-within .phase__num {
  background: var(--bronze);
  color: var(--ink-green-deep);
  transform: scale(1.05);
}

/* ---------- 内容体系 ---------- */
.page-about .about-system {
  background:
    radial-gradient(100% 70% at 8% 0%, rgba(185, 133, 62, .12) 0%, rgba(18, 62, 58, 0) 70%),
    var(--felt-teal);
  color: var(--warm-white);
}

.page-about .about-system .about-head h2 {
  color: var(--warm-white);
}

.page-about .about-system .about-head__sub {
  color: rgba(243, 235, 221, .74);
}

.page-about .about-system .about-head .vnote {
  color: var(--bronze-lit);
}

.page-about .lines {
  margin-top: clamp(22px, 4vw, 36px);
  border-top: 1px solid rgba(185, 133, 62, .38);
}

.page-about .lines__row {
  display: grid;
  gap: 10px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(185, 133, 62, .24);
  transition: background-color .22s var(--ease-soft);
}

.page-about .lines__row:hover {
  background: rgba(185, 133, 62, .08);
}

.page-about .lines__label {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .lines__idx {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--bronze-lit);
}

.page-about .lines__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.8vw, 24px);
  letter-spacing: .02em;
  color: var(--warm-white);
}

.page-about .lines__desc {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(243, 235, 221, .78);
}

.page-about .lines__desc + .lines__desc {
  margin-top: 10px;
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  background: linear-gradient(180deg, #FBF6EC 0%, var(--warm-white) 100%);
}

.page-about .crew__figure {
  margin: clamp(22px, 4vw, 34px) 0 0;
}

.page-about .crew {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 4vw, 32px);
}

.page-about .crew__card {
  --shift: 0px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 20px 22px;
  border: 1px solid var(--paper-grey);
  border-radius: var(--r-lg);
  background: linear-gradient(168deg, #FFFDF8 0%, var(--warm-white) 100%);
  box-shadow: var(--shadow-1);
  transform: translateY(var(--shift));
  transition: transform .22s var(--ease-soft), border-color .22s var(--ease-soft);
}

.page-about .crew__card:hover {
  transform: translateY(calc(var(--shift) - 4px));
  border-color: var(--bronze);
}

.page-about .crew__num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--bronze);
}

.page-about .crew__num small {
  margin-left: 3px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist-teal);
}

.page-about .crew__role {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--ink-green);
}

.page-about .crew__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.82;
  color: var(--text-soft);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-rhythm {
  background:
    radial-gradient(90% 80% at 92% 8%, rgba(18, 62, 58, .9) 0%, rgba(7, 29, 24, 0) 66%),
    var(--ink-green-deep);
  color: var(--warm-white);
}

.page-about .rhythm {
  display: grid;
  gap: clamp(24px, 4.4vw, 40px);
}

.page-about .rhythm__quote {
  margin: 0;
  padding: 22px 22px 24px;
  border-left: 2px solid var(--bronze);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(243, 235, 221, .07);
}

.page-about .rhythm__quote p {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(15.5px, 2.2vw, 18px);
  line-height: 1.9;
  color: rgba(243, 235, 221, .92);
}

.page-about .rhythm__item {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid rgba(185, 133, 62, .28);
}

.page-about .rhythm__item:last-child {
  border-bottom: 1px solid rgba(185, 133, 62, .28);
}

.page-about .rhythm__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--bronze-lit);
}

.page-about .rhythm__val {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.86;
  color: rgba(243, 235, 221, .78);
}

/* ---------- 下一步入口 ---------- */
.page-about .about-next {
  background: var(--warm-white);
}

.page-about .about-next__title {
  margin: 0 0 clamp(20px, 3.6vw, 30px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.2vw, 36px);
  letter-spacing: .02em;
  color: var(--ink-green);
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .next-card {
  position: relative;
  display: block;
  overflow: hidden;
  padding: 26px 24px 28px;
  border: 1px solid rgba(185, 133, 62, .42);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(18, 62, 58, .92) 0%, rgba(11, 43, 36, 0) 68%),
    var(--ink-green);
  color: var(--warm-white);
  text-decoration: none;
  transition: border-color .22s var(--ease-soft), transform .22s var(--ease-soft);
}

.page-about .next-card:hover {
  border-color: var(--bronze-lit);
  transform: translateY(-3px);
}

.page-about .next-card:focus-visible {
  outline: 2px solid var(--bronze-lit);
  outline-offset: 4px;
}

.page-about .next-card__kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--bronze-lit);
}

.page-about .next-card__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.2vw, 27px);
  letter-spacing: .02em;
  color: var(--warm-white);
}

.page-about .next-card__text {
  margin: 10px 0 0;
  max-width: 30em;
  font-size: 14.5px;
  line-height: 1.88;
  color: rgba(243, 235, 221, .78);
}

.page-about .next-card__go {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 18px;
  padding: 7px 16px;
  border: 1px solid rgba(216, 176, 106, .55);
  border-radius: var(--r-pill);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--bronze-lit);
  transition: background-color .22s var(--ease-soft), color .22s var(--ease-soft);
}

.page-about .next-card__go::after {
  content: "→";
  font-family: var(--font-mono);
}

.page-about .next-card:hover .next-card__go {
  background: var(--bronze-lit);
  color: var(--ink-green-deep);
}

.page-about .about-next__more {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-soft);
}

.page-about .about-next__more a {
  color: var(--felt-teal);
  text-decoration: underline;
  text-decoration-color: var(--bronze);
  text-underline-offset: 3px;
}

.page-about .about-next__more a:hover {
  color: var(--vermilion);
}

.page-about .about-next__more a:focus-visible {
  outline: 2px solid var(--bronze-lit);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .rhythm__item {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 640px) {
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .lines__row {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 32px;
    padding: 28px 0;
    align-items: start;
  }

  .page-about .rhythm {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 46px;
    align-items: start;
  }

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

@media (min-width: 880px) {
  .page-about {
    --about-rail: 31px;
  }

  .page-about .about-head {
    grid-template-columns: 42px minmax(0, 1fr);
    column-gap: 20px;
    align-items: start;
  }

  .page-about .about-head .vnote {
    writing-mode: vertical-rl;
    letter-spacing: .3em;
  }

  .page-about .about-head h2,
  .page-about .about-head__sub {
    grid-column: 2;
  }

  .page-about .phase {
    grid-template-columns: 62px minmax(0, 1fr);
    column-gap: 28px;
    padding-bottom: 44px;
  }

  .page-about .phase__num {
    width: 62px;
    height: 62px;
    font-size: 14px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: end;
    gap: 56px;
  }
}

@media (min-width: 1080px) {
  .page-about .crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    padding-bottom: 46px;
  }

  .page-about .crew__card:nth-child(2) {
    --shift: 26px;
  }

  .page-about .crew__card:nth-child(3) {
    --shift: 8px;
  }

  .page-about .crew__card:nth-child(4) {
    --shift: 38px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew__card,
  .page-about .next-card,
  .page-about .phase__num,
  .page-about .lines__row {
    transition: none;
  }

  .page-about .crew__card:hover,
  .page-about .next-card:hover,
  .page-about .phase:hover .phase__num,
  .page-about .phase:focus-within .phase__num {
    transform: none;
  }
}