.page-about {
  position: relative;
  isolation: isolate;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 560px;
  background:
    radial-gradient(120% 82% at 84% 0%, rgba(27, 78, 140, 0.11), transparent 62%),
    radial-gradient(90% 70% at 6% 10%, rgba(31, 110, 79, 0.11), transparent 60%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero {
  padding-top: 26px;
}

.page-about .about-hero__head {
  max-width: 46rem;
  margin-top: 18px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 5.4vw, 52px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
  color: var(--ink);
}

.page-about .about-hero__lede {
  font-size: clamp(17px, 1.55vw, 21px);
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--slate);
  max-width: 40em;
  margin: 0;
}

/* 首屏数字条 */
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 32px 0 0;
  padding: 0;
}

.page-about .about-fact {
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 16px 18px 14px;
  backdrop-filter: blur(3px);
}

.page-about .about-fact dt {
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--slate);
  text-transform: uppercase;
}

.page-about .about-fact dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1;
  color: var(--bao-blue);
  font-variant-numeric: tabular-nums;
}

/* 首屏主图 */
.page-about .about-hero__figure {
  position: relative;
  margin: 36px 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-2);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: clamp(220px, 40vw, 440px);
  object-fit: cover;
}

.page-about .about-hero__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 28, 24, 0) 40%, rgba(7, 28, 24, 0.76) 100%);
  pointer-events: none;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 18px 20px;
  color: var(--bone);
  font-size: var(--fs-14);
  line-height: 1.7;
  letter-spacing: 0.01em;
}

/* 编年轴 */
.page-about .about-chron-section .section-head {
  align-items: flex-end;
}

.page-about .about-chron-section .chip-strip {
  margin-top: 20px;
}

.page-about .about-chron {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.page-about .about-chron__entry {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-chron__entry::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 52px;
  bottom: -30px;
  width: 2px;
  background: linear-gradient(180deg, rgba(27, 78, 140, 0.34), rgba(27, 78, 140, 0));
  pointer-events: none;
}

.page-about .about-chron__entry:last-child::before {
  display: none;
}

.page-about .about-chron__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-chron__no {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  border-radius: var(--r-pill);
  background: var(--bao-blue);
  color: var(--bone);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.04em;
  box-shadow: 0 6px 16px rgba(12, 45, 82, 0.26);
}

.page-about .about-chron__stage {
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--data-orange);
  border: 1px solid rgba(255, 106, 43, 0.42);
  border-radius: var(--r-pill);
  padding: 3px 12px;
  white-space: nowrap;
}

.page-about .about-chron__body {
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: 24px 20px 20px;
  box-shadow: var(--shadow-1);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-chron__body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 2.4vw, 28px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  color: var(--ink);
}

.page-about .about-chron__body p {
  margin: 0 0 12px;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: #2b3338;
  max-width: 42em;
}

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

.page-about .about-chron__extra {
  margin-top: 16px !important;
  padding-top: 13px;
  border-top: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-size: var(--fs-14) !important;
  color: var(--slate) !important;
  letter-spacing: 0.01em;
}

@media (hover: hover) {
  .page-about .about-chron__body:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-2);
  }
}

/* 团队分工 */
.page-about .about-team__grid {
  align-items: start;
  gap: calc(var(--gap) * 1.8);
}

.page-about .about-team__copy h2 {
  margin-bottom: 16px;
}

.page-about .about-team__copy > p {
  font-size: var(--fs-17);
  line-height: 1.85;
  color: #2b3338;
  margin: 0 0 14px;
  max-width: 40em;
}

.page-about .about-roster {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-role {
  background: var(--blue-deep);
  border-radius: var(--r-md);
  padding: 18px 16px 16px;
  color: var(--bone);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 38px);
  line-height: 1;
  color: var(--score-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__label {
  display: block;
  margin-top: 10px;
  font-size: var(--fs-14);
  letter-spacing: 0.06em;
  color: var(--bone-72);
}

.page-about .about-role__note {
  margin: 10px 0 0;
  font-size: var(--fs-12);
  line-height: 1.75;
  color: var(--bone-48);
}

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

.page-about .about-team__media .media-frame {
  border-radius: var(--r-lg);
  overflow: hidden;
}

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

.page-about .about-team__media figcaption {
  margin-top: 12px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--slate);
}

/* 十五分钟粒度带 */
.page-about .about-grain__inner {
  position: relative;
  background: linear-gradient(140deg, rgba(31, 110, 79, 0.12), rgba(27, 78, 140, 0.10) 62%, rgba(255, 255, 255, 0.72));
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: 32px 22px;
  overflow: hidden;
}

.page-about .about-grain__inner::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 106, 43, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .about-grain__inner h2 {
  margin-bottom: 16px;
}

.page-about .about-grain__lede {
  font-size: var(--fs-17);
  line-height: 1.85;
  color: #2b3338;
  max-width: 42em;
  margin: 0;
}

.page-about .about-grain__strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 30px 0 0;
}

.page-about .about-grain__seg {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 6px 12px;
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(31, 110, 79, 0.20);
  box-shadow: inset 0 -3px 0 0 var(--prairie-light);
}

.page-about .about-grain__seg b {
  font-family: var(--font-mono);
  font-size: var(--fs-21);
  line-height: 1;
  color: var(--prairie);
  font-variant-numeric: tabular-nums;
}

.page-about .about-grain__seg i {
  font-style: normal;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .about-grain__notes {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-grain__notes li {
  position: relative;
  padding-left: 20px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: #2b3338;
  max-width: 44em;
}

.page-about .about-grain__notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 10px;
  height: 2px;
  background: var(--data-orange);
  border-radius: 2px;
}

/* 换人窗口 */
.page-about .about-swap__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.page-about .about-swap__copy h2 {
  margin-bottom: 16px;
}

.page-about .about-swap__copy p {
  font-size: var(--fs-17);
  line-height: 1.85;
  color: #2b3338;
  margin: 0 0 14px;
  max-width: 40em;
}

.page-about .about-swap__window {
  background: var(--pitch-night);
  border-radius: var(--r-lg);
  padding: 26px 22px 22px;
  box-shadow: var(--shadow-2);
}

.page-about .about-swap__marks {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  position: relative;
}

.page-about .about-swap__mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 6px;
  border-radius: var(--r-sm);
  background: rgba(245, 242, 233, 0.06);
  border: 1px solid rgba(245, 242, 233, 0.16);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--bone-62);
  text-align: center;
}

.page-about .about-swap__mark b {
  font-family: var(--font-mono);
  font-size: var(--fs-21);
  line-height: 1;
  color: var(--bone);
  font-variant-numeric: tabular-nums;
}

.page-about .about-swap__mark--mid {
  background: rgba(255, 106, 43, 0.16);
  border-color: rgba(255, 106, 43, 0.55);
}

.page-about .about-swap__mark--mid b {
  color: var(--data-orange);
}

.page-about .about-swap__caption {
  margin: 20px 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--bone-72);
}

/* 合作 */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 34px;
  align-items: start;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-partners__list li {
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-left: 4px solid var(--prairie);
  border-radius: var(--r-md);
  padding: 20px 20px 18px;
}

.page-about .about-partners__list h3 {
  font-family: var(--font-display);
  font-size: var(--fs-21);
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--bao-blue);
}

.page-about .about-partners__list p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: #2b3338;
}

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

.page-about .about-partners__media .media-frame {
  border-radius: var(--r-lg);
  overflow: hidden;
}

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

.page-about .about-partners__media figcaption {
  margin-top: 12px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--slate);
}

/* 下一程 */
.page-about .about-next__panel {
  position: relative;
  background: linear-gradient(155deg, var(--blue-deep) 0%, #0B2440 52%, var(--pitch-night) 100%);
  border-radius: var(--r-lg);
  padding: 36px 22px 30px;
  color: var(--bone);
  overflow: hidden;
}

.page-about .about-next__panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: linear-gradient(90deg, var(--prairie-light), var(--score-gold));
}

.page-about .about-next__panel::after {
  content: "";
  position: absolute;
  right: -100px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(62, 154, 114, 0.30), transparent 68%);
  pointer-events: none;
}

.page-about .kicker--light {
  color: var(--score-gold);
}

.page-about .about-next__panel .section-title {
  color: var(--bone);
  margin-bottom: 16px;
}

.page-about .about-next__lede {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--bone-72);
  max-width: 42em;
}

.page-about .about-next__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-next__list li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 18px 16px;
  border-radius: var(--r-md);
  background: rgba(245, 242, 233, 0.05);
  border: 1px solid rgba(245, 242, 233, 0.13);
}

.page-about .about-next__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--score-gold);
  letter-spacing: 0.06em;
  padding-top: 4px;
}

.page-about .about-next__list h3 {
  font-family: var(--font-display);
  font-size: var(--fs-21);
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--bone);
}

.page-about .about-next__list p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--bone-62);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-next__links {
  margin: 24px 0 0;
  font-size: var(--fs-14);
  line-height: 1.9;
  color: var(--bone-62);
}

.page-about .about-next__links a {
  color: var(--bone);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 242, 233, 0.4);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  color: var(--score-gold);
  border-bottom-color: var(--score-gold);
}

@media (min-width: 640px) {
  .page-about .about-roster {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-grain__strip {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-grain__inner {
    padding: 40px 34px;
  }

  .page-about .about-next__panel {
    padding: 48px 40px 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-chron {
    gap: 44px;
    margin-top: 48px;
  }

  .page-about .about-chron__entry {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-chron__entry::before {
    left: 21px;
    top: 54px;
    bottom: -46px;
  }

  .page-about .about-chron__entry:nth-child(odd) .about-chron__body {
    max-width: 40em;
  }

  .page-about .about-chron__entry:nth-child(even) .about-chron__body {
    max-width: 34em;
    margin-left: clamp(24px, 9%, 120px);
  }

  .page-about .about-chron__body {
    padding: 28px 30px 24px;
  }

  .page-about .about-swap__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
    align-items: center;
  }

  .page-about .about-next__panel {
    padding: 56px 52px 46px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-chron__body {
    transition: none;
  }

  .page-about .about-chron__body:hover {
    transform: none;
  }
}