.page-about {
  padding-block: clamp(20px, 3vw, 34px) clamp(56px, 9vw, 112px);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

/* ---------------- 首屏 ---------------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(36px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 7.4vw, 4.35rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 52ch;
  font-size: clamp(0.95rem, 1.65vw, 1.1rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-hero__meta li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
}

.page-about .about-hero__meta .num {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .about-hero__figure {
  margin: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
  overflow: hidden;
}

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

/* ---------------- 起点叙事 ---------------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding-block: clamp(40px, 7vw, 88px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-origin__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--orange);
  opacity: 0.85;
}

.page-about .about-origin__body h2 {
  margin: 0 0 16px;
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  line-height: 1.32;
  letter-spacing: -0.01em;
}

.page-about .about-origin__body p {
  margin: 0 0 14px;
  max-width: 66ch;
  line-height: 1.88;
  color: var(--mist);
}

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

.page-about .about-origin__body a,
.page-about .about-partners__intro a,
.page-about .about-report__body a {
  color: var(--orange-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 147, 88, 0.42);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-origin__body a:hover,
.page-about .about-partners__intro a:hover,
.page-about .about-report__body a:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------------- 时间线 ---------------- */
.page-about .about-tl {
  padding-block: clamp(44px, 7vw, 96px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-tl__head {
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-tl__head h2 {
  margin: 12px 0 0;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.26;
  letter-spacing: -0.01em;
}

.page-about .about-tl__intro {
  margin: 14px 0 0;
  max-width: 58ch;
  line-height: 1.82;
  color: var(--mist);
}

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

.page-about .about-tl__list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--line) 26%, var(--line) 100%);
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 30px;
}

.page-about .about-tl__item + .about-tl__item {
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-tl__node {
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(232, 106, 44, 0.14);
}

.page-about .about-tl__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.1;
  letter-spacing: 0.08em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl__card {
  position: relative;
  padding: clamp(18px, 3vw, 26px);
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .about-tl__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--orange);
  pointer-events: none;
}

.page-about .about-tl__card h3 {
  margin: 0;
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  line-height: 1.42;
  letter-spacing: -0.01em;
}

.page-about .about-tl__lead {
  margin: 8px 0 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-tl__more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.page-about .about-tl__more summary {
  display: flex;
  align-items: center;
  gap: 9px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange-soft);
  transition: color 180ms var(--ease);
}

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

.page-about .about-tl__more summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 17px;
  height: 17px;
  font-size: 14px;
  line-height: 1;
  color: var(--ink);
  background: var(--orange);
}

.page-about .about-tl__more[open] summary::before {
  content: "−";
}

.page-about .about-tl__more summary:hover {
  color: var(--paper);
}

.page-about .about-tl__more p {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------------- 团队与能力 ---------------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(44px, 7vw, 96px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__media {
  margin: 0;
  aspect-ratio: 1100 / 740;
  border: 1px solid var(--line);
  overflow: hidden;
}

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

.page-about .about-team__body h2 {
  margin: 12px 0 0;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.26;
  letter-spacing: -0.01em;
}

.page-about .about-team__body p {
  margin: 14px 0 0;
  max-width: 60ch;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-stats {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(14px, 2.2vw, 20px);
  background: var(--ink);
}

.page-about .about-stats__item dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-stats__item dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-stats__item .num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

/* ---------------- 合作生态 ---------------- */
.page-about .about-partners {
  padding-block: clamp(44px, 7vw, 96px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-partners__intro h2 {
  margin: 12px 0 0;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.26;
  letter-spacing: -0.01em;
}

.page-about .about-partners__intro p {
  margin: 14px 0 0;
  max-width: 56ch;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-partners__list li {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: clamp(16px, 2.6vw, 24px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-partners__list .num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners__list strong {
  display: block;
  font-size: 0.98rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-partners__list p {
  margin: 6px 0 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------------- 年度观察报告 ---------------- */
.page-about .about-report {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(44px, 7vw, 96px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-report__media {
  margin: 0;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-deep);
}

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

.page-about .about-report__body h2 {
  margin: 12px 0 0;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.26;
  letter-spacing: -0.01em;
}

.page-about .about-report__body > p {
  margin: 14px 0 0;
  max-width: 58ch;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-report__topics {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-report__topics li {
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
  line-height: 1.82;
  color: var(--mist);
  max-width: 60ch;
}

.page-about .about-report__topics strong {
  color: var(--paper);
  font-weight: 600;
}

.page-about .about-report__k {
  display: inline-block;
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  vertical-align: 2px;
}

.page-about .about-report__more {
  font-size: 0.94rem;
}

/* ---------------- 接下来 ---------------- */
.page-about .about-next {
  margin-top: clamp(44px, 7vw, 96px);
  padding: clamp(24px, 4.2vw, 52px);
  background: linear-gradient(135deg, var(--panel) 0%, var(--ink-deep) 100%);
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
}

.page-about .about-next h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-about .about-next__list {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-next__list li {
  padding-left: 16px;
  border-left: 2px solid var(--line);
  max-width: 64ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-next__list strong {
  display: block;
  margin-bottom: 4px;
  color: var(--paper);
  font-size: 1rem;
}

.page-about .about-next__cta {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------------- 断点 ---------------- */
@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-origin {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-origin__index {
    font-size: 42px;
  }

  .page-about .about-tl__list::before {
    left: 156px;
    top: 12px;
  }

  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 64px;
    padding-left: 0;
  }

  .page-about .about-tl__node {
    left: 148px;
    top: 9px;
  }

  .page-about .about-tl__year {
    margin: 0;
    padding-top: 2px;
    text-align: right;
    font-size: clamp(24px, 2.6vw, 32px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-report {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__more summary,
  .page-about .about-origin__body a,
  .page-about .about-partners__intro a,
  .page-about .about-report__body a {
    transition: none;
  }
}