.page-about {
  --about-rail: 280px;
  --about-gap: clamp(22px, 3.6vw, 54px);
  --about-edge: rgba(224, 207, 175, .26);
  --about-panel-x: clamp(20px, 2.6vw, 36px);
  --about-panel-y: clamp(22px, 2.8vw, 40px);

  display: block;
  background: var(--ink);
  color: var(--cream);
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 210, .4);
  transition: color var(--fast), border-color var(--fast);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--orange);
  border-bottom-color: rgba(255, 106, 43, .6);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 64px) 0 clamp(40px, 6vw, 80px);
  background:
    radial-gradient(120% 88% at 86% 4%, rgba(47, 227, 210, .15), transparent 58%),
    radial-gradient(78% 70% at 4% 104%, rgba(255, 106, 43, .13), transparent 62%),
    var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 20ch;
  font-size: clamp(32px, 7.2vw, 74px);
  line-height: 1.06;
  letter-spacing: .005em;
  font-weight: 900;
  color: var(--cream);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.85;
  color: rgba(244, 234, 215, .82);
}

.page-about .about-hero__board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4vw, 48px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__cell {
  padding: clamp(16px, 2vw, 24px);
  background: var(--glass);
  backdrop-filter: blur(8px);
}

.page-about .about-hero__cell .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-hero__cell--cyan {
  color: var(--cyan);
}

.page-about .about-hero__cell--amber {
  color: var(--amber);
}

.page-about .about-hero__cell .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--haze);
}

.page-about .about-hero__trace {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -10px;
  width: 100%;
  height: clamp(120px, 18vw, 220px);
  opacity: .62;
  pointer-events: none;
  z-index: 1;
}

/* ---------- 通用行布局 ---------- */

.page-about .about-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

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

.page-about .about-rail {
  min-width: 0;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--about-edge);
  border-radius: var(--radius);
  background: var(--glass);
}

.page-about .about-rail--center {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--ink-2);
  border-color: var(--line-strong);
}

.page-about .about-rail__head {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--haze);
}

.page-about .about-rail__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--haze);
}

/* ---------- 三条内容线 ---------- */

.page-about .about-origin {
  padding: clamp(44px, 6vw, 84px) 0;
}

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

.page-about .about-lines__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .about-lines__text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--cream);
}

.page-about .about-origin__panel {
  border: 1px solid var(--sand);
  box-shadow: var(--shadow-panel);
}

.page-about .about-origin__panel .panel__title {
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.35;
  font-weight: 800;
  color: var(--brown);
}

.page-about .about-origin__panel .panel__body {
  padding-top: 6px;
}

.page-about .about-origin__panel .prose p {
  margin: 0 0 1em;
  color: var(--brown);
}

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

.page-about .about-origin__panel .about-link {
  color: #0d5f60;
  border-bottom-color: rgba(13, 95, 96, .35);
}

.page-about .about-origin__panel .about-link:hover,
.page-about .about-origin__panel .about-link:focus-visible {
  color: var(--brick);
  border-bottom-color: rgba(214, 57, 43, .5);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding: clamp(44px, 6vw, 84px) 0;
  background: linear-gradient(180deg, rgba(22, 32, 76, .9), rgba(11, 18, 48, .96));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-roles {
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-roles__item {
  padding: clamp(16px, 2vw, 22px);
  background: var(--glass);
}

.page-about .about-roles__name {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-roles__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 234, 215, .76);
}

.page-about .about-team__note {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 234, 215, .78);
}

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

.page-about .about-team__media .media__frame {
  border: 1px solid var(--line-strong);
}

/* ---------- 流程 ---------- */

.page-about .about-flow {
  padding: clamp(44px, 6vw, 84px) 0;
}

.page-about .about-flow__head {
  max-width: 46em;
}

.page-about .about-flow__strip {
  margin: clamp(26px, 3.4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  counter-reset: flow;
}

.page-about .about-flow__step {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  transition: border-color .22s ease, background .22s ease, transform .22s ease;
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  border-color: rgba(47, 227, 210, .45);
  background: rgba(47, 227, 210, .06);
  transform: translateY(-2px);
}

.page-about .about-flow__idx {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .about-flow__name {
  margin: 10px 0 0;
  font-size: 20px;
  font-weight: 800;
  color: var(--cream);
}

.page-about .about-flow__brief {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--haze);
}

.page-about .about-flow__more {
  display: block;
  margin-top: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 234, 215, .84);
  transition: max-height .24s ease, opacity .24s ease, margin-top .24s ease;
}

.page-about .about-flow__step:hover .about-flow__more,
.page-about .about-flow__step:focus-within .about-flow__more,
.page-about .about-flow__step:focus .about-flow__more {
  max-height: 9em;
  opacity: 1;
  margin-top: 12px;
}

.page-about .about-flow__figure {
  margin: clamp(28px, 3.6vw, 44px) 0 0;
}

.page-about .about-flow__figure .media__frame {
  border: 1px solid var(--line-strong);
}

/* ---------- 发展历程 ---------- */

.page-about .about-era {
  padding: clamp(44px, 6vw, 84px) 0;
  background: linear-gradient(180deg, rgba(11, 18, 48, .6), rgba(22, 32, 76, .85));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-era__head {
  max-width: 42em;
  margin-bottom: clamp(26px, 3.4vw, 44px);
}

.page-about .about-era__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-era__rail {
  position: relative;
  padding-left: 4px;
}

.page-about .about-era__svg {
  position: absolute;
  top: 6px;
  left: 5px;
  width: 8px;
  height: calc(100% - 12px);
  pointer-events: none;
}

.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  display: grid;
  gap: 20px;
}

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

.page-about .about-tl__link {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--haze);
  transition: color var(--fast);
}

.page-about .about-tl__dot {
  position: absolute;
  left: -26px;
  top: .5em;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 227, 210, .12);
}

.page-about .about-tl__year {
  font-size: 20px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-tl__cap {
  font-size: 13px;
  letter-spacing: .02em;
}

.page-about .about-tl__link:hover,
.page-about .about-tl__link:focus-visible {
  color: var(--cyan);
}

.page-about .about-era__panels {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.page-about .about-era__item {
  padding: var(--about-panel-y) var(--about-panel-x);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  background: var(--cream);
  color: var(--brown);
  box-shadow: var(--shadow-panel);
  scroll-margin-top: 96px;
}

.page-about .about-era__stamp {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--brick);
}

.page-about .about-era__title {
  margin: 12px 0 0;
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1.35;
  font-weight: 800;
  color: var(--brown);
}

.page-about .about-era__item p:last-child {
  margin: 12px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(27, 20, 9, .82);
}

/* ---------- 合作生态 ---------- */

.page-about .about-source {
  padding: clamp(44px, 6vw, 84px) 0;
}

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

.page-about .about-source__media .media__frame {
  border: 1px solid var(--line-strong);
}

.page-about .about-source__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 2.8vw, 32px);
}

.page-about .about-source__card {
  border: 1px solid var(--sand);
}

.page-about .about-source__card .card__label {
  color: var(--brick);
}

.page-about .about-source__card .card__title {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  color: var(--brown);
  letter-spacing: -.01em;
}

.page-about .about-source__card .card__meta {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(27, 20, 9, .78);
}

.page-about .about-source__note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 234, 215, .76);
}

/* ---------- 用户规模 ---------- */

.page-about .about-scale {
  padding: clamp(44px, 6vw, 84px) 0;
  background: linear-gradient(180deg, rgba(22, 32, 76, .95), rgba(11, 18, 48, .98));
  border-top: 1px solid var(--line);
}

.page-about .about-ring {
  width: clamp(132px, 20vw, 168px);
  height: clamp(132px, 20vw, 168px);
  transform: rotate(-90deg);
}

.page-about .about-ring__track {
  fill: none;
  stroke: rgba(224, 207, 175, .16);
  stroke-width: 8;
}

.page-about .about-ring__value {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 222.2 326.7;
}

.page-about .about-ring__figure {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-ring__cap {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--haze);
}

.page-about .about-scale__facts {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 2.8vw, 34px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-scale__fact {
  padding: clamp(16px, 2vw, 22px);
  background: var(--glass);
}

.page-about .about-scale__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--amber);
}

.page-about .about-scale__v {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 234, 215, .78);
}

.page-about .about-scale__note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 234, 215, .76);
}

/* ---------- 更正反馈 ---------- */

.page-about .about-fix {
  padding: 0 0 clamp(52px, 7vw, 96px);
}

.page-about .about-fix__panel {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
  border: 1px solid var(--sand);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.page-about .about-fix__panel::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: linear-gradient(180deg, var(--orange), var(--brick));
}

.page-about .about-fix__title {
  margin: 12px 0 0;
  font-size: clamp(22px, 2.8vw, 32px);
  line-height: 1.3;
  font-weight: 800;
  color: var(--brown);
}

.page-about .about-fix__text {
  margin: 14px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(27, 20, 9, .82);
}

.page-about .about-fix__col--act {
  padding: clamp(16px, 2.2vw, 24px);
  border: 1px dashed rgba(214, 57, 43, .45);
  border-radius: var(--radius-sm);
  background: rgba(224, 207, 175, .38);
}

.page-about .about-fix__hint {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--brick);
}

.page-about .about-fix__list {
  margin: 14px 0 20px;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(27, 20, 9, .82);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero__board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

  .page-about .about-fix__panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-row {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-row--wide {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
  }

  .page-about .about-row--flip {
    grid-template-columns: minmax(0, 420px) minmax(0, 1fr);
  }

  .page-about .about-row--flip .about-source__media {
    order: -1;
  }

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

  .page-about .about-era__layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-era__rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-era__panels {
    gap: 20px;
  }
}

@media (hover: none) {
  .page-about .about-flow__more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__step,
  .page-about .about-flow__more,
  .page-about .about-link {
    transition: none;
  }

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