.page-about {
  --about-rail: 44px;
  --about-gap: 16px;
  --about-line: rgba(198, 204, 212, .18);
  --about-line-strong: rgba(224, 179, 84, .5);
  --about-body: rgba(245, 241, 234, .74);
  --about-body-dark: rgba(30, 38, 48, .74);
  background: var(--c-night);
  color: var(--c-paper);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 5vw, 54px) 0 clamp(44px, 7vw, 88px);
  background:
    radial-gradient(120% 84% at 92% -12%, rgba(255, 106, 26, .28), transparent 62%),
    radial-gradient(90% 72% at -4% 108%, rgba(27, 110, 156, .34), transparent 66%),
    var(--c-night);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -24%;
  right: -14%;
  width: min(62vw, 560px);
  aspect-ratio: 1 / 1;
  border-radius: 62% 38% 55% 45% / 48% 62% 38% 52%;
  background: linear-gradient(140deg, rgba(179, 39, 30, .40), rgba(255, 106, 26, .04) 72%);
  pointer-events: none;
}

.page-about .about-hero__label {
  margin: 10px 0 0;
}

.page-about .about-hero__title {
  margin: 18px 0 20px;
  max-width: 16em;
  font-size: clamp(34px, 6.4vw, 72px);
  line-height: 1.07;
  letter-spacing: -.02em;
  color: var(--c-paper);
}

.page-about .about-lede {
  max-width: 36em;
  margin: 0;
  font-size: clamp(16px, 1.55vw, 18.5px);
  line-height: 1.82;
  color: var(--about-body);
}

.page-about .about-hero__figure {
  margin: clamp(30px, 5vw, 56px) 0 0;
}

.page-about .about-hero__frame {
  overflow: hidden;
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) 6px;
  border: 1px solid var(--about-line);
  background: var(--c-deep);
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  position: relative;
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .about-sec__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  align-items: start;
}

.page-about .about-sec__body {
  min-width: 0;
}

.page-about .about-sec__rail {
  position: relative;
}

.page-about .about-sec__rail::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 34px;
  bottom: -18px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-line-strong), rgba(198, 204, 212, .05));
}

.page-about .about-sec__num {
  position: relative;
  z-index: 1;
  display: inline-block;
  padding: 3px 9px;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--c-gold);
  border: 1px solid rgba(224, 179, 84, .38);
  border-radius: 999px;
  background: rgba(14, 17, 24, .78);
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  font-size: clamp(25px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -.018em;
}

.page-about .about-prose {
  max-width: 38em;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-prose--single {
  max-width: 38em;
  margin: 0 0 1.05em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--about-body);
}

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

.page-about .about-link {
  color: var(--c-lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(27, 110, 156, .45);
  padding-bottom: 1px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--c-ember);
  border-bottom-color: rgba(255, 106, 26, .6);
}

.page-about .about-link--light {
  color: var(--c-gold);
  border-bottom-color: rgba(224, 179, 84, .45);
}

.page-about .about-link--light:hover,
.page-about .about-link--light:focus-visible {
  color: var(--c-ember);
  border-bottom-color: rgba(255, 106, 26, .6);
}

/* ---------- 01 坐标来源 ---------- */

.page-about .about-origin {
  background: var(--c-night);
}

.page-about .about-coord {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-coord__item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 16px;
  background: var(--c-deep);
}

.page-about .about-coord__k {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--c-lake);
}

.page-about .about-coord__v {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--about-body);
}

/* ---------- 02 四件事 ---------- */

.page-about .about-services {
  background: var(--c-paper);
  color: var(--c-ink);
  --about-body: var(--about-body-dark);
}

.page-about .about-services .about-sec__num {
  background: rgba(245, 241, 234, .9);
}

.page-about .about-services .about-sec__rail::before {
  background: linear-gradient(180deg, rgba(179, 39, 30, .45), rgba(30, 38, 48, .06));
}

.page-about .about-cards {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-card {
  padding: clamp(20px, 2.6vw, 28px);
  background: #fff;
  border: 1px solid rgba(30, 38, 48, .1);
  border-left: 3px solid var(--c-ember);
  border-radius: var(--r-organic);
  box-shadow: 0 18px 40px -32px rgba(14, 17, 24, .55);
}

.page-about .about-card__meta {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-flame);
}

.page-about .about-card__num {
  display: block;
  margin: 6px 0 2px;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-ember);
}

.page-about .about-card__title {
  margin: 8px 0 10px;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.35;
  color: var(--c-ink);
}

.page-about .about-card__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(30, 38, 48, .72);
}

/* ---------- 03 轨道 ---------- */

.page-about .about-stages {
  background: linear-gradient(180deg, var(--c-night) 0%, var(--c-deep) 100%);
}

.page-about .about-stageindex {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 2.6vw, 26px) 0 clamp(30px, 4.4vw, 46px);
}

.page-about .about-stageindex a {
  display: inline-block;
  padding: 6px 12px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--about-body);
  text-decoration: none;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-stageindex a:hover,
.page-about .about-stageindex a:focus-visible {
  color: var(--c-ember);
  border-color: rgba(255, 106, 26, .5);
  background: rgba(255, 106, 26, .08);
}

.page-about .about-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 48px;
  display: grid;
  gap: clamp(28px, 4vw, 46px);
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 6px;
  bottom: 0;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--c-ember) 0%, rgba(224, 179, 84, .7) 42%, rgba(27, 110, 156, .55) 100%);
}

.page-about .about-track__item {
  position: relative;
  scroll-margin-top: 120px;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -40px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-night);
  border: 2px solid var(--c-ember);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, .13);
}

.page-about .about-track__step {
  display: block;
  margin-bottom: 6px;
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--c-gold);
}

.page-about .about-track__title {
  margin: 0 0 8px;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.32;
  color: var(--c-paper);
}

.page-about .about-track__text {
  margin: 0;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--about-body);
}

.page-about .about-track__item:nth-child(n + 4) .about-track__title {
  font-size: clamp(17.5px, 1.9vw, 21px);
}

.page-about .about-track__item:nth-child(n + 4) .about-track__text {
  font-size: 15px;
}

.page-about .about-stages__fig {
  margin: clamp(34px, 5vw, 58px) 0 0;
}

/* ---------- 04 团队 ---------- */

.page-about .about-team {
  background: var(--c-deep);
}

.page-about .about-roles {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-role {
  padding: 16px 18px;
  background: rgba(245, 241, 234, .05);
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
}

.page-about .about-role[open] {
  border-color: rgba(255, 106, 26, .35);
  background: rgba(255, 106, 26, .05);
}

.page-about .about-role summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-paper);
}

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

.page-about .about-role summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-ember);
}

.page-about .about-role[open] summary::after {
  content: "－";
}

.page-about .about-role__name {
  font-size: 17px;
  letter-spacing: -.01em;
}

.page-about .about-role__tag {
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--c-gold);
  font-weight: 400;
}

.page-about .about-role__body {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--about-body);
}

.page-about .about-team__fig {
  margin: clamp(30px, 4vw, 48px) 0 0;
}

/* ---------- 05 覆盖 ---------- */

.page-about .about-reach {
  background: var(--c-paper);
  color: var(--c-ink);
  --about-body: var(--about-body-dark);
}

.page-about .about-reach .about-sec__num {
  background: rgba(245, 241, 234, .9);
}

.page-about .about-reach .about-sec__rail::before {
  background: linear-gradient(180deg, rgba(27, 110, 156, .45), rgba(30, 38, 48, .06));
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3vw, 32px);
  padding: 1px;
  background: rgba(30, 38, 48, .12);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-stat {
  padding: 20px 18px;
  background: #fff;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(25px, 3vw, 33px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--c-flame);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.62;
  color: rgba(30, 38, 48, .66);
}

.page-about .about-scale {
  margin-top: clamp(24px, 3.2vw, 36px);
}

.page-about .about-scale__legend {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: rgba(30, 38, 48, .58);
}

.page-about .about-scale__bar {
  position: relative;
  height: 14px;
  border-radius: 999px;
  background: rgba(30, 38, 48, .1);
  overflow: hidden;
}

.page-about .about-scale__fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 76%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--c-lake) 0%, var(--c-ember) 68%, var(--c-gold) 100%);
}

.page-about .about-scale__axis {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(30, 38, 48, .52);
}

.page-about .about-reach__note {
  margin-top: clamp(22px, 3vw, 30px);
}

/* ---------- 06 收束 ---------- */

.page-about .about-why {
  padding-bottom: clamp(64px, 9vw, 120px);
  background: var(--c-night);
}

.page-about .about-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 62px);
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) 8px;
  border: 1px solid rgba(224, 179, 84, .22);
  background: linear-gradient(152deg, rgba(179, 39, 30, .92) 0%, rgba(14, 17, 24, .97) 68%);
}

.page-about .about-panel::after {
  content: "";
  position: absolute;
  top: -32%;
  right: -12%;
  width: min(46%, 380px);
  aspect-ratio: 1 / 1;
  border-radius: 58% 42% 48% 52% / 52% 58% 42% 48%;
  background: radial-gradient(circle at 32% 32%, rgba(255, 106, 26, .5), transparent 72%);
  pointer-events: none;
}

.page-about .about-panel__label {
  margin: 0 0 16px;
}

.page-about .about-panel__title {
  margin: 0 0 16px;
  max-width: 20em;
  font-size: clamp(25px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -.018em;
  color: var(--c-paper);
}

.page-about .about-panel__lede {
  max-width: 36em;
  margin: 0 0 clamp(24px, 3.4vw, 40px);
  font-size: 16.5px;
  line-height: 1.84;
  color: rgba(245, 241, 234, .8);
}

.page-about .about-why__grid {
  display: grid;
  gap: 18px;
  margin-bottom: clamp(26px, 3.6vw, 42px);
}

.page-about .about-why__item {
  padding-top: 16px;
  border-top: 1px solid rgba(224, 179, 84, .28);
}

.page-about .about-why__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.35;
  color: var(--c-gold);
}

.page-about .about-why__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(245, 241, 234, .78);
}

.page-about .about-panel__cta {
  position: relative;
  z-index: 1;
}

.page-about .about-panel__foot {
  position: relative;
  z-index: 1;
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 241, 234, .6);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-card:nth-child(even) {
    margin-top: 30px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-role:nth-child(even) {
    margin-top: 26px;
  }

  .page-about .about-why__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 860px) {
  .page-about .about-sec__inner {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-sec__rail::before {
    bottom: -26px;
  }

  .page-about .about-track {
    padding-left: 56px;
  }

  .page-about .about-track__item::before {
    left: -48px;
  }

  .page-about .about-prose p,
  .page-about .about-prose--single {
    font-size: 17px;
  }
}

@media (max-width: 420px) {
  .page-about .about-track {
    padding-left: 40px;
  }

  .page-about .about-track__item::before {
    left: -33px;
    width: 10px;
    height: 10px;
  }

  .page-about .about-stat__num {
    font-size: 23px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stageindex a {
    transition: none;
  }
}
</main>

.page-about {
  --about-rail: 44px;
  --about-line: rgba(198, 204, 212, .18);
  --about-line-strong: rgba(224, 179, 84, .5);
  --about-body: rgba(245, 241, 234, .74);
  --about-body-dark: rgba(30, 38, 48, .74);
  background: var(--c-night);
  color: var(--c-paper);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 5vw, 54px) 0 clamp(44px, 7vw, 88px);
  background:
    radial-gradient(120% 84% at 92% -12%, rgba(255, 106, 26, .28), transparent 62%),
    radial-gradient(90% 72% at -4% 108%, rgba(27, 110, 156, .34), transparent 66%),
    var(--c-night);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -24%;
  right: -14%;
  width: min(62vw, 560px);
  aspect-ratio: 1 / 1;
  border-radius: 62% 38% 55% 45% / 48% 62% 38% 52%;
  background: linear-gradient(140deg, rgba(179, 39, 30, .4), rgba(255, 106, 26, .04) 72%);
  pointer-events: none;
}

.page-about .about-hero__label {
  margin: 10px 0 0;
}

.page-about .about-hero__title {
  margin: 18px 0 20px;
  max-width: 16em;
  font-size: clamp(34px, 6.4vw, 72px);
  line-height: 1.07;
  letter-spacing: -.02em;
  color: var(--c-paper);
}

.page-about .about-lede {
  max-width: 36em;
  margin: 0;
  font-size: clamp(16px, 1.55vw, 18.5px);
  line-height: 1.82;
  color: var(--about-body);
}

.page-about .about-hero__figure {
  margin: clamp(30px, 5vw, 56px) 0 0;
}

.page-about .about-hero__frame {
  overflow: hidden;
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) 6px;
  border: 1px solid var(--about-line);
  background: var(--c-deep);
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  position: relative;
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .about-sec__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  align-items: start;
}

.page-about .about-sec__body {
  min-width: 0;
}

.page-about .about-sec__rail {
  position: relative;
}

.page-about .about-sec__rail::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 34px;
  bottom: -18px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-line-strong), rgba(198, 204, 212, .05));
}

.page-about .about-sec__num {
  position: relative;
  z-index: 1;
  display: inline-block;
  padding: 3px 9px;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--c-gold);
  border: 1px solid rgba(224, 179, 84, .38);
  border-radius: 999px;
  background: rgba(14, 17, 24, .78);
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  font-size: clamp(25px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -.018em;
}

.page-about .about-prose {
  max-width: 38em;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--about-body);
}

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

.page-about .about-prose--single {
  max-width: 38em;
  margin: 0 0 1.05em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-link {
  color: var(--c-lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(27, 110, 156, .45);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--c-ember);
  border-bottom-color: rgba(255, 106, 26, .6);
}

.page-about .about-link--light {
  color: var(--c-gold);
  border-bottom-color: rgba(224, 179, 84, .45);
}

.page-about .about-link--light:hover,
.page-about .about-link--light:focus-visible {
  color: var(--c-ember);
  border-bottom-color: rgba(255, 106, 26, .6);
}

/* ---------- 01 坐标从哪里来 ---------- */

.page-about .about-origin {
  background: var(--c-night);
}

.page-about .about-coord {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-coord__item {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 16px;
  background: var(--c-deep);
}

.page-about .about-coord__k {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--c-lake);
}

.page-about .about-coord__v {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--about-body);
}

/* ---------- 02 长期在做的四件事 ---------- */

.page-about .about-services {
  background: var(--c-paper);
  color: var(--c-ink);
  --about-body: var(--about-body-dark);
}

.page-about .about-services .about-sec__num {
  background: rgba(245, 241, 234, .92);
}

.page-about .about-services .about-sec__rail::before {
  background: linear-gradient(180deg, rgba(179, 39, 30, .45), rgba(30, 38, 48, .06));
}

.page-about .about-cards {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-card {
  padding: clamp(20px, 2.6vw, 28px);
  background: #fff;
  border: 1px solid rgba(30, 38, 48, .1);
  border-left: 3px solid var(--c-ember);
  border-radius: var(--r-organic);
  box-shadow: 0 18px 40px -32px rgba(14, 17, 24, .55);
}

.page-about .about-card__meta {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-flame);
}

.page-about .about-card__num {
  display: block;
  margin: 6px 0 2px;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-ember);
}

.page-about .about-card__title {
  margin: 8px 0 10px;
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.35;
  color: var(--c-ink);
}

.page-about .about-card__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(30, 38, 48, .72);
}

/* ---------- 03 六个阶段 ---------- */

.page-about .about-stages {
  background: linear-gradient(180deg, var(--c-night) 0%, var(--c-deep) 100%);
}

.page-about .about-stageindex {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 2.6vw, 26px) 0 clamp(30px, 4.4vw, 46px);
}

.page-about .about-stageindex a {
  display: inline-block;
  padding: 6px 12px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--about-body);
  text-decoration: none;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-stageindex a:hover,
.page-about .about-stageindex a:focus-visible {
  color: var(--c-ember);
  border-color: rgba(255, 106, 26, .5);
  background: rgba(255, 106, 26, .08);
}

.page-about .about-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 48px;
  display: grid;
  gap: clamp(28px, 4vw, 46px);
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 6px;
  bottom: 0;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--c-ember) 0%, rgba(224, 179, 84, .7) 42%, rgba(27, 110, 156, .55) 100%);
}

.page-about .about-track__item {
  position: relative;
  scroll-margin-top: 120px;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -40px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-night);
  border: 2px solid var(--c-ember);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, .13);
}

.page-about .about-track__step {
  display: block;
  margin-bottom: 6px;
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--c-gold);
}

.page-about .about-track__title {
  margin: 0 0 8px;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.32;
  color: var(--c-paper);
}

.page-about .about-track__text {
  margin: 0;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--about-body);
}

.page-about .about-track__item:nth-child(n + 4) .about-track__title {
  font-size: clamp(17.5px, 1.9vw, 21px);
}

.page-about .about-track__item:nth-child(n + 4) .about-track__text {
  font-size: 15px;
}

.page-about .about-stages__fig {
  margin: clamp(34px, 5vw, 58px) 0 0;
}

/* ---------- 04 团队 ---------- */

.page-about .about-team {
  background: var(--c-deep);
}

.page-about .about-roles {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-role {
  padding: 16px 18px;
  background: rgba(245, 241, 234, .05);
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
}

.page-about .about-role[open] {
  border-color: rgba(255, 106, 26, .35);
  background: rgba(255, 106, 26, .05);
}

.page-about .about-role summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  color: var(--c-paper);
}

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

.page-about .about-role summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-ember);
}

.page-about .about-role[open] summary::after {
  content: "－";
}

.page-about .about-role__name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-role__tag {
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--c-gold);
}

.page-about .about-role__body {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--about-body);
}

.page-about .about-team__fig {
  margin: clamp(30px, 4vw, 48px) 0 0;
}

/* ---------- 05 覆盖范围 ---------- */

.page-about .about-reach {
  background: var(--c-paper);
  color: var(--c-ink);
  --about-body: var(--about-body-dark);
}

.page-about .about-reach .about-sec__num {
  background: rgba(245, 241, 234, .92);
}

.page-about .about-reach .about-sec__rail::before {
  background: linear-gradient(180deg, rgba(27, 110, 156, .45), rgba(30, 38, 48, .06));
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3vw, 32px);
  padding: 1px;
  background: rgba(30, 38, 48, .12);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-stat {
  padding: 20px 18px;
  background: #fff;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(25px, 3vw, 33px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--c-flame);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.62;
  color: rgba(30, 38, 48, .66);
}

.page-about .about-scale {
  margin-top: clamp(24px, 3.2vw, 36px);
}

.page-about .about-scale__legend {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: rgba(30, 38, 48, .58);
}

.page-about .about-scale__bar {
  position: relative;
  height: 14px;
  border-radius: 999px;
  background: rgba(30, 38, 48, .1);
  overflow: hidden;
}

.page-about .about-scale__fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 76%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--c-lake) 0%, var(--c-ember) 68%, var(--c-gold) 100%);
}

.page-about .about-scale__axis {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(30, 38, 48, .52);
}

.page-about .about-reach__note {
  margin-top: clamp(22px, 3vw, 30px);
}

/* ---------- 06 收束面板 ---------- */

.page-about .about-why {
  padding-bottom: clamp(64px, 9vw, 120px);
  background: var(--c-night);
}

.page-about .about-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 62px);
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) 8px;
  border: 1px solid rgba(224, 179, 84, .22);
  background: linear-gradient(152deg, rgba(179, 39, 30, .92) 0%, rgba(14, 17, 24, .97) 68%);
}

.page-about .about-panel::after {
  content: "";
  position: absolute;
  top: -32%;
  right: -12%;
  width: min(46%, 380px);
  aspect-ratio: 1 / 1;
  border-radius: 58% 42% 48% 52% / 52% 58% 42% 48%;
  background: radial-gradient(circle at 32% 32%, rgba(255, 106, 26, .5), transparent 72%);
  pointer-events: none;
}

.page-about .about-panel__label {
  margin: 0 0 16px;
}

.page-about .about-panel__title {
  margin: 0 0 16px;
  max-width: 20em;
  font-size: clamp(25px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -.018em;
  color: var(--c-paper);
}

.page-about .about-panel__lede {
  max-width: 36em;
  margin: 0 0 clamp(24px, 3.4vw, 40px);
  font-size: 16.5px;
  line-height: 1.84;
  color: rgba(245, 241, 234, .8);
}

.page-about .about-why__grid {
  display: grid;
  gap: 18px;
  margin-bottom: clamp(26px, 3.6vw, 42px);
}

.page-about .about-why__item {
  padding-top: 16px;
  border-top: 1px solid rgba(224, 179, 84, .28);
}

.page-about .about-why__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.35;
  color: var(--c-gold);
}

.page-about .about-why__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(245, 241, 234, .78);
}

.page-about .about-panel__cta {
  position: relative;
  z-index: 1;
}

.page-about .about-panel__foot {
  position: relative;
  z-index: 1;
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 241, 234, .6);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-card:nth-child(even) {
    margin-top: 30px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-role:nth-child(even) {
    margin-top: 26px;
  }

  .page-about .about-why__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 860px) {
  .page-about .about-sec__inner {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-sec__rail::before {
    bottom: -26px;
  }

  .page-about .about-track {
    padding-left: 56px;
  }

  .page-about .about-track__item::before {
    left: -48px;
  }

  .page-about .about-prose p,
  .page-about .about-prose--single {
    font-size: 17px;
  }
}

@media (max-width: 420px) {
  .page-about .about-track {
    padding-left: 40px;
  }

  .page-about .about-track__item::before {
    left: -33px;
    width: 10px;
    height: 10px;
  }

  .page-about .about-stat__num {
    font-size: 23px;
  }
}

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