.page-about {
  --about-pad-y: clamp(2.5rem, 6vw, 5rem);
  --about-line: rgba(155, 184, 170, .16);
  background: var(--ink-800);
  color: var(--mist);
  overflow-x: hidden;
}

.page-about .about-crumbs {
  padding-block: 1.25rem 0;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--sage);
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: .5rem;
  color: rgba(155, 184, 170, .45);
}

.page-about .breadcrumbs__list a {
  color: var(--sage);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .breadcrumbs__list a:hover,
.page-about .breadcrumbs__list a:focus-visible {
  color: var(--lime);
}

.page-about .breadcrumbs__item[aria-current] {
  color: var(--mist);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(2.5rem, 6vw, 5rem);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(89, 214, 192, .10), transparent 58%),
    radial-gradient(80% 70% at 10% 100%, rgba(11, 61, 46, .85), transparent 70%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.75rem, 5vw, 2.75rem);
  align-items: end;
}

.page-about .about-hero__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  color: var(--lime);
  margin: 0 0 .9rem;
}

.page-about .about-hero__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.4rem, 8.4vw, 5.6rem);
  line-height: .95;
  letter-spacing: -.015em;
  color: var(--mist);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 34rem;
  font-size: clamp(1rem, 2.1vw, 1.1rem);
  line-height: 1.8;
  color: rgba(234, 247, 238, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: 1rem 1.25rem;
  margin: 2rem 0 0;
  padding: 1.35rem 0 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  font-size: .8rem;
  color: var(--sage);
  line-height: 1.4;
}

.page-about .about-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.6vw, 2.1rem);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(200, 255, 61, .16), transparent 46%);
  mix-blend-mode: screen;
  pointer-events: none;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  max-width: 100%;
  filter: saturate(1.05) contrast(1.04);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding-block: var(--about-pad-y);
  border-top: 1px solid var(--about-line);
}

.page-about .about-head {
  display: grid;
  gap: .55rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .about-head__index {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--lime);
}

.page-about .about-head__title {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.55rem, 4.4vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -.01em;
}

/* ---------- 方法 ---------- */

.page-about .about-method {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
}

.page-about .about-steps > li {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: .25rem .9rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-steps > li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-steps__no {
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--lime);
  padding-top: .35rem;
}

.page-about .about-steps__title {
  margin: 0 0 .45rem;
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--mist);
}

.page-about .about-steps__text {
  margin: 0;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--sage);
}

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

.page-about .about-method__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-left: 2px solid var(--line-strong);
}

.page-about .media-frame__caption {
  display: block;
  margin-top: .8rem;
  font-size: .76rem;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--sage);
}

/* ---------- 节奏 ---------- */

.page-about .about-rhythm-section {
  background:
    radial-gradient(90% 120% at 0% 50%, rgba(11, 61, 46, .9), transparent 68%);
}

.page-about .about-rhythm {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-rhythm__note {
  margin: 0;
  font-size: .98rem;
  line-height: 1.8;
  color: rgba(234, 247, 238, .8);
  max-width: 40rem;
}

.page-about .about-pulse {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .about-rhythm__scale {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 1rem;
  margin: 0;
  padding: 1.15rem 0 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
  font-size: .84rem;
  line-height: 1.55;
  color: var(--sage);
}

.page-about .about-rhythm__scale .mono {
  display: block;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .08em;
  color: var(--cyan);
  margin-bottom: .3rem;
}

/* ---------- 时间线 ---------- */

.page-about .about-years {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
}

.page-about .about-year {
  display: grid;
  gap: .5rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-year__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.75rem, 5vw, 2.6rem);
  line-height: 1;
  color: rgba(200, 255, 61, .38);
  transition: color .28s var(--ease);
}

.page-about .about-year:hover .about-year__num,
.page-about .about-year:focus-within .about-year__num {
  color: var(--lime);
}

.page-about .about-year__ver {
  margin: 0 0 .4rem;
  font-size: .95rem;
  font-weight: 500;
  color: var(--mist);
}

.page-about .about-year__desc {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--sage);
  transition: color .28s var(--ease);
}

.page-about .about-year:hover .about-year__desc {
  color: rgba(234, 247, 238, .92);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: 1.5rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__stats li {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-stat__num {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.9rem, 5.6vw, 2.9rem);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-stat__label {
  font-size: .78rem;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--sage);
}

.page-about .about-team__text p {
  margin: 0 0 1rem;
  font-size: .96rem;
  line-height: 1.8;
  color: rgba(234, 247, 238, .82);
}

.page-about .about-team__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-team__text a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, .45);
  transition: border-color .2s var(--ease);
}

.page-about .about-team__text a:hover,
.page-about .about-team__text a:focus-visible {
  border-color: var(--lime);
}

/* ---------- 协作 ---------- */

.page-about .about-eco {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-about .about-eco__list {
  display: grid;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-eco__list li {
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-eco__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-eco__list .tag {
  display: inline-block;
  margin-bottom: .6rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
}

.page-about .about-eco__list p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--sage);
}

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

.page-about .about-eco__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-bottom: 2px solid var(--line-strong);
}

/* ---------- 收尾 CTA ---------- */

.page-about .about-cta {
  display: grid;
  gap: 1.25rem;
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding: clamp(1.5rem, 4.5vw, 2.75rem);
  border: 1px solid var(--line-strong);
  background: linear-gradient(135deg, rgba(200, 255, 61, .13), rgba(89, 214, 192, .07) 55%, transparent 100%);
}

.page-about .about-cta__title {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.25rem, 3.4vw, 1.75rem);
  line-height: 1.2;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.7;
  color: var(--sage);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 断点 ---------- */

@media (min-width: 780px) {
  .page-about .about-head {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    align-items: start;
    gap: 1rem;
  }

  .page-about .about-head__index {
    padding-top: .55rem;
  }

  .page-about .about-head__title {
    max-width: 26ch;
  }

  .page-about .about-year {
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: clamp(1rem, 3vw, 2.5rem);
    align-items: start;
    padding-block: 1.75rem;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-method {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

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

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

@media (min-width: 1100px) {
  .page-about .about-rhythm {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    grid-template-areas:
      "note chart"
      "scale chart";
    align-items: start;
    column-gap: clamp(2rem, 5vw, 4rem);
    row-gap: 1.5rem;
  }

  .page-about .about-rhythm__note { grid-area: note; }
  .page-about .about-pulse { grid-area: chart; align-self: center; }
  .page-about .about-rhythm__scale { grid-area: scale; margin-top: .5rem; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__figure::after {
    display: none;
  }

  .page-about .about-year__num,
  .page-about .about-year__desc,
  .page-about .breadcrumbs__list a,
  .page-about .about-team__text a {
    transition: none;
  }
}