.page-about {
  --about-line: rgba(183, 122, 37, .26);
  --about-cut: 18px;
  --about-soft: rgba(255, 248, 237, .78);
  background: var(--sand);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.14;
  letter-spacing: .01em;
  margin: 0;
}

.page-about p {
  margin: 0;
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: 1.25rem 2.5rem;
  background:
    radial-gradient(120% 95% at 88% -10%, rgba(217, 162, 74, .55), rgba(217, 162, 74, 0) 62%),
    radial-gradient(90% 70% at 0% 25%, rgba(184, 135, 75, .22), rgba(184, 135, 75, 0) 70%),
    linear-gradient(180deg, var(--sand-2), var(--sand));
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -22%;
  bottom: -46%;
  width: 78%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: repeating-radial-gradient(circle at 50% 50%, rgba(122, 35, 51, .10) 0 1px, transparent 1px 28px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
}

.page-about .about-hero__copy {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .about-hero__tag {
  justify-self: start;
  display: inline-block;
  padding: .4rem .9rem;
  font-family: var(--font-display);
  font-size: .92rem;
  letter-spacing: .08em;
  color: var(--wine);
  background: rgba(255, 248, 237, .88);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.page-about .about-hero h1 {
  font-size: clamp(2.1rem, 8.4vw, 4rem);
  color: var(--wine-deep);
  line-height: 1.06;
  max-width: 16em;
}

.page-about .about-hero__lede {
  font-size: 1rem;
  color: var(--ink);
  max-width: 34em;
}

.page-about .about-hero__points {
  list-style: none;
  margin: .25rem 0 0;
  padding: 0;
  display: grid;
  gap: .7rem;
  max-width: 34em;
}

.page-about .about-hero__points li {
  position: relative;
  padding-left: 1.5rem;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-hero__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .8em;
  width: .78rem;
  height: 3px;
  background: var(--ember);
}

.page-about .about-hero__points strong {
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: .5rem;
}

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 30px 100%, 0 calc(100% - 30px));
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero__figure figcaption {
  margin-top: .65rem;
  font-size: .82rem;
  color: var(--slate);
  line-height: 1.6;
}

.page-about .about-facts {
  position: relative;
  z-index: 1;
  margin: 2rem 0 0;
  padding: 1rem 1.1rem;
  display: grid;
  gap: 1rem;
  background: var(--about-soft);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-facts__item {
  display: grid;
  gap: .1rem;
}

.page-about .about-facts dt {
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--slate);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: 1.45rem;
  line-height: 1.1;
  color: var(--wine);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-block: 2.75rem;
}

.page-about .about-chapter__inner {
  display: grid;
  gap: 2rem;
}

.page-about .about-chapter__body {
  min-width: 0;
  display: grid;
  gap: 2rem;
}

.page-about .about-section-head {
  display: grid;
  gap: .7rem;
  max-width: 44rem;
}

.page-about .about-section-head h2 {
  font-size: clamp(1.65rem, 5.4vw, 2.5rem);
  color: var(--wine-deep);
}

.page-about .about-section-head p {
  color: var(--slate);
  font-size: .98rem;
}

/* ---------- 索引 ---------- */
.page-about .about-index {
  align-self: start;
  padding: 1.1rem 1.15rem;
  border-left: 3px solid var(--gold);
  background: rgba(220, 227, 224, .42);
}

.page-about .about-index__label {
  font-family: var(--font-display);
  font-size: .95rem;
  letter-spacing: .1em;
  color: var(--wine);
  margin-bottom: .6rem;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .45rem;
  counter-reset: idx;
}

.page-about .about-index__list li {
  counter-increment: idx;
  font-size: .9rem;
}

.page-about .about-index__list a {
  display: block;
  padding: .18rem 0 .18rem 1.7rem;
  position: relative;
  color: var(--ink);
  text-decoration: none;
  line-height: 1.5;
  transition: color .2s var(--ease);
}

.page-about .about-index__list a::before {
  content: counter(idx, decimal-leading-zero);
  position: absolute;
  left: 0;
  font-family: var(--font-num);
  font-size: .78rem;
  color: var(--gold-deep);
}

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

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 .2rem;
  position: relative;
  display: grid;
  gap: 1.6rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: .4rem;
  bottom: .4rem;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--wine));
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 1.5rem;
  display: grid;
  gap: .3rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: .55rem;
  width: 12px;
  height: 12px;
  background: var(--sand);
  border: 2px solid var(--wine);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  font-family: var(--font-num);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--wine);
}

.page-about .about-timeline__content h3 {
  font-size: 1.12rem;
  color: var(--ink);
  margin-bottom: .3rem;
}

.page-about .about-timeline__content p {
  color: var(--slate);
  font-size: .95rem;
}

/* ---------- 三步方法 ---------- */
.page-about .about-method {
  padding-block: 2.75rem;
  background:
    radial-gradient(80% 90% at 100% 0%, rgba(217, 162, 74, .18), rgba(217, 162, 74, 0) 70%),
    linear-gradient(180deg, var(--slate-light), #EDF2EF);
}

.page-about .about-steps {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-step {
  position: relative;
  padding: 1.35rem 1.25rem 1.5rem;
  background: var(--sand);
  border-top: 3px solid var(--gold);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  box-shadow: var(--shadow-lift);
}

.page-about .about-step__num {
  display: block;
  font-family: var(--font-num);
  font-size: 2.6rem;
  line-height: .9;
  color: var(--gold);
  margin-bottom: .45rem;
}

.page-about .about-step h3 {
  font-size: 1.2rem;
  color: var(--wine-deep);
  margin-bottom: .4rem;
}

.page-about .about-step p {
  font-size: .94rem;
  color: var(--slate);
}

/* ---------- 团队 ---------- */
.page-about .about-team__inner {
  display: grid;
  gap: 2rem;
}

.page-about .about-team__copy {
  display: grid;
  gap: 1.6rem;
  min-width: 0;
}

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

.page-about .about-crew__item {
  padding: .9rem 1rem .95rem 1.1rem;
  border-left: 3px solid var(--river);
  background: rgba(247, 234, 216, .55);
}

.page-about .about-crew__role {
  display: block;
  font-family: var(--font-display);
  font-size: 1.02rem;
  letter-spacing: .04em;
  color: var(--wine);
  margin-bottom: .25rem;
}

.page-about .about-crew__item p {
  font-size: .93rem;
  color: var(--slate);
}

.page-about .about-team__figure {
  margin: 0;
  align-self: start;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-team__figure figcaption {
  margin-top: .6rem;
  font-size: .82rem;
  color: var(--slate);
  line-height: 1.6;
}

/* ---------- 合作网络 ---------- */
.page-about .about-network {
  background: linear-gradient(180deg, var(--sand), var(--sand-2) 70%, var(--sand));
}

.page-about .about-network__grid {
  margin-top: 1.75rem;
  display: grid;
  gap: 1.75rem;
}

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

.page-about .about-network__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 0 100%);
}

.page-about .about-network__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-network__node {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "count label"
    "text text";
  column-gap: .6rem;
  align-items: baseline;
  padding-bottom: .85rem;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-network__count {
  grid-area: count;
  font-family: var(--font-num);
  font-size: 1.7rem;
  line-height: 1;
  color: var(--ember);
  -webkit-text-stroke: 1px var(--gold-deep);
}

.page-about .about-network__label {
  grid-area: label;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--wine-deep);
}

.page-about .about-network__node p {
  grid-area: text;
  margin-top: .35rem;
  font-size: .9rem;
  color: var(--slate);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm__inner {
  display: grid;
  gap: 1.75rem;
}

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

.page-about .about-rhythm__row {
  display: grid;
  gap: .25rem;
  padding: .85rem 0;
  border-bottom: 1px solid rgba(79, 93, 94, .16);
}

.page-about .about-rhythm__when {
  font-family: var(--font-num);
  font-size: 1.05rem;
  color: var(--wine);
  letter-spacing: .02em;
}

.page-about .about-rhythm__row p {
  font-size: .94rem;
  color: var(--slate);
}

/* ---------- 规模与观察 ---------- */
.page-about .about-scale {
  background: linear-gradient(180deg, var(--slate-light), #EDF2EF);
}

.page-about .about-scale__grid {
  margin-top: 1.75rem;
  display: grid;
  gap: 1.5rem;
}

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

.page-about .about-scale__stat {
  display: grid;
  gap: .2rem;
  padding-left: .9rem;
  border-left: 4px solid var(--ember);
}

.page-about .about-scale__num {
  font-family: var(--font-num);
  font-size: clamp(1.9rem, 7vw, 2.9rem);
  line-height: 1;
  color: var(--wine);
}

.page-about .about-scale__cap {
  font-size: .92rem;
  color: var(--slate);
  line-height: 1.6;
}

.page-about .about-scale__note {
  background: var(--wine);
  color: var(--sand);
  padding: 1.4rem 1.3rem 1.5rem;
  display: grid;
  gap: .7rem;
  align-content: start;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .about-scale__note h3 {
  font-size: 1.15rem;
  color: var(--sand);
}

.page-about .about-scale__note p {
  font-size: .92rem;
  color: rgba(255, 248, 237, .86);
}

.page-about .about-scale__link {
  justify-self: start;
  margin-top: .2rem;
  font-size: .9rem;
  color: var(--ember-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 180, 67, .6);
  padding-bottom: .1rem;
}

.page-about .about-scale__link:hover,
.page-about .about-scale__link:focus-visible {
  color: var(--sand);
  border-bottom-color: var(--sand);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding-block: 2.75rem 3.25rem;
  background:
    radial-gradient(110% 120% at 88% 0%, rgba(255, 159, 28, .3), rgba(255, 159, 28, 0) 62%),
    linear-gradient(160deg, var(--wine-lift), var(--wine-deep));
  color: var(--sand);
}

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

.page-about .about-cta h2 {
  font-size: clamp(1.6rem, 5.2vw, 2.4rem);
  color: var(--sand);
}

.page-about .about-cta__copy p {
  margin-top: .6rem;
  max-width: 32em;
  font-size: .96rem;
  color: rgba(255, 248, 237, .85);
}

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

.page-about .about-cta__plain {
  font-size: .9rem;
  color: var(--sand);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 248, 237, .5);
  padding-bottom: .12rem;
}

.page-about .about-cta__plain:hover,
.page-about .about-cta__plain:focus-visible {
  color: var(--ember-soft);
  border-bottom-color: var(--ember-soft);
}

/* ---------- 宽屏 ---------- */
@media (min-width: 780px) {
  .page-about .about-hero {
    padding-block: 2rem 3rem;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: center;
    gap: 2.75rem;
  }

  .page-about .about-hero__lede {
    font-size: 1.05rem;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: .5rem 1.5rem;
    padding: 1.1rem 1.5rem;
  }

  .page-about .about-facts__item + .about-facts__item {
    padding-left: 1.5rem;
    border-left: 1px solid var(--about-line);
  }

  .page-about .about-chapter {
    padding-block: 3.5rem;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    column-gap: 1.75rem;
    padding-left: 1.9rem;
  }

  .page-about .about-timeline::before {
    transform: skewX(-3.5deg);
    transform-origin: top center;
    left: .35rem;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.35rem;
    align-items: start;
  }

  .page-about .about-step:nth-child(2) {
    margin-top: 2rem;
  }

  .page-about .about-step:nth-child(3) {
    margin-top: 4rem;
  }

  .page-about .about-team__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 2.75rem;
    align-items: start;
  }

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

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 2.25rem;
    align-items: start;
  }

  .page-about .about-rhythm__row {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    column-gap: 1.5rem;
    align-items: baseline;
  }

  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 2.25rem;
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2rem;
  }

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

@media (min-width: 960px) {
  .page-about .about-chapter__inner {
    grid-template-columns: 15.5rem minmax(0, 1fr);
    gap: 3.25rem;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-method,
  .page-about .about-chapter,
  .page-about .about-cta {
    padding-block: 4.25rem;
  }

  .page-about .about-hero h1 {
    font-size: clamp(2.6rem, 4.6vw, 4rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-scale__link,
  .page-about .about-cta__plain {
    transition: none;
  }
}