.page-about {
  --ab-rail: 172px;
  --ab-hair: rgba(154, 167, 164, .32);
  --ab-hair-soft: rgba(154, 167, 164, .16);
  --ab-onDark: rgba(246, 243, 236, .78);
  --ab-onDark-soft: rgba(246, 243, 236, .55);
}

.page-about .ab-hero {
  background: var(--paper-050);
  padding: calc(var(--band-pad) * .72) 0 calc(var(--band-pad) * .9);
}

.page-about .crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55em;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--silver-400);
}

.page-about .crumbs-list li[aria-current] {
  color: var(--ink-text);
  opacity: .7;
}

.page-about .crumbs-list a {
  color: var(--silver-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s ease, border-color .16s ease;
}

.page-about .crumbs-list a:hover {
  color: var(--volt-700);
  border-bottom-color: var(--volt-500);
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
  margin-top: 36px;
}

.page-about .ab-kicker {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--volt-700);
}

.page-about .ab-hero-title {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(30px, 8vw, 56px);
  line-height: 1.16;
  letter-spacing: .005em;
  color: var(--ink-900);
}

.page-about .ab-hero-lede {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-text);
  opacity: .84;
}

.page-about .ab-hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: 28px 0 0;
}

.page-about .ab-arrow-link {
  position: relative;
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--volt-700);
  text-decoration: none;
  padding-bottom: 3px;
}

.page-about .ab-arrow-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--volt-500);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .18s ease;
}

.page-about .ab-arrow-link:hover::after,
.page-about .ab-arrow-link:focus-visible::after {
  transform: scaleX(1);
}

.page-about .ab-hero-art {
  width: 100%;
  max-width: 560px;
}

.page-about .ab-hero-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-sec {
  padding: calc(var(--band-pad) * .92) 0;
}

.page-about .ab-sec--paper { background: var(--paper-050); }
.page-about .ab-sec--card  { background: var(--paper-000); }

.page-about .ab-sec--dark {
  background: var(--ink-900);
  color: var(--paper-050);
  background-image:
    radial-gradient(120% 90% at 88% 4%, rgba(31, 107, 255, .18), transparent 62%),
    radial-gradient(90% 70% at 4% 96%, rgba(255, 106, 31, .07), transparent 66%);
}

.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .ab-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--silver-400);
}

.page-about .ab-rail-num {
  font-weight: 700;
  color: var(--volt-500);
}

.page-about .ab-rail-label {
  text-transform: uppercase;
}

.page-about .ab-sec--dark .ab-rail-num { color: var(--volt-200); }
.page-about .ab-sec--dark .ab-rail-label { color: var(--silver-400); }

.page-about .ab-main { min-width: 0; }

.page-about .ab-h {
  margin: 0 0 18px;
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(25px, 5.6vw, 42px);
  line-height: 1.24;
  letter-spacing: .005em;
  color: var(--ink-900);
}

.page-about .ab-h--onDark { color: var(--paper-050); }

.page-about .ab-lede {
  margin: 0 0 36px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-text);
  opacity: .8;
}

.page-about .ab-lede--onDark { color: var(--ab-onDark); opacity: 1; }

.page-about .ab-body p {
  margin: 0 0 18px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-text);
}

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

.page-about .ab-dropcap::first-letter {
  float: left;
  font-family: var(--serif);
  font-weight: 900;
  font-size: 3.5em;
  line-height: .84;
  padding: .06em .12em 0 0;
  color: var(--volt-700);
}

.page-about .ab-body--onDark p { color: var(--ab-onDark); }

/* 团队构成 */
.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

.page-about .ab-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .ab-role-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.page-about .ab-role-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .ab-role-num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: .02em;
  color: var(--volt-700);
}

.page-about .ab-role-bar {
  height: 6px;
  margin: 10px 0 12px;
  border-radius: 3px;
  background: var(--silver-200);
  overflow: hidden;
}

.page-about .ab-role-bar > i {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--volt-700), var(--volt-500));
}

.page-about .ab-role--1 .ab-role-bar > i { width: 42%; }
.page-about .ab-role--2 .ab-role-bar > i { width: 32%; }
.page-about .ab-role--3 .ab-role-bar > i { width: 26%; }

.page-about .ab-role-desc {
  margin: 0;
  max-width: 38em;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-text);
  opacity: .72;
}

/* 图片 */
.page-about .ab-fig {
  margin: 0;
}

.page-about .ab-fig img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--silver-200);
  border-radius: 6px;
  background: var(--paper-000);
  object-fit: cover;
  box-shadow: var(--shadow-card);
}

.page-about .ab-sec--dark .ab-fig img {
  border-color: var(--rule-dark);
  background: var(--ink-800);
  box-shadow: none;
}

.page-about .ab-cap {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver-400);
}

.page-about .ab-fig--flow,
.page-about .ab-fig--track {
  margin-top: 40px;
}

/* 流程五步 */
.page-about .ab-flow {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 22px 12px 22px 8px;
  border-top: 1px solid var(--ab-hair);
  transition: background-color .16s ease, border-color .16s ease;
}

.page-about .ab-step:last-child {
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .ab-step:hover,
.page-about .ab-step:focus-within {
  background: rgba(31, 107, 255, .08);
  border-top-color: var(--volt-500);
}

.page-about .ab-step-num {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--volt-200);
  padding-top: 4px;
}

.page-about .ab-step-h {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--paper-050);
}

.page-about .ab-step-p {
  margin: 0;
  max-width: 42em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ab-onDark);
}

/* 时间轴 */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--silver-200);
}

.page-about .ab-node {
  position: relative;
  padding: 0 0 34px 30px;
}

.page-about .ab-node:last-child {
  padding-bottom: 0;
}

.page-about .ab-node-dot {
  position: absolute;
  left: 0;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--volt-500);
  background: var(--paper-050);
  transition: background-color .18s ease, transform .18s ease;
}

.page-about .ab-node:hover .ab-node-dot {
  background: var(--volt-500);
  transform: scale(1.18);
}

.page-about .ab-node-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
}

.page-about .ab-node-tag {
  color: var(--silver-400);
  text-transform: uppercase;
}

.page-about .ab-node-ver {
  font-weight: 700;
  color: var(--volt-700);
}

.page-about .ab-node-h {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .ab-node-p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-text);
  opacity: .78;
}

/* 规模数字 */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 36px;
  padding: 0;
  background: var(--ab-hair-soft);
  border-top: 1px solid var(--ab-hair);
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .ab-stat {
  background: var(--ink-900);
  padding: 22px 14px 20px;
}

.page-about .ab-stat-k {
  margin: 0 0 10px;
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--silver-400);
}

.page-about .ab-stat-v {
  margin: 0;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(26px, 7vw, 40px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--paper-050);
  text-align: right;
}

.page-about .ab-stat-u {
  font-size: .44em;
  font-weight: 500;
  margin-left: .18em;
  color: var(--volt-200);
}

/* 三条理由 */
.page-about .ab-reasons {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .ab-reason {
  padding: 26px 22px 24px;
  background: var(--paper-000);
  border: 1px solid var(--silver-200);
  border-radius: 6px;
  box-shadow: var(--shadow-card);
  transition: border-color .16s ease, transform .16s ease;
}

.page-about .ab-reason:hover {
  border-color: var(--volt-500);
  transform: translateY(-2px);
}

.page-about .ab-reason-idx {
  display: block;
  margin-bottom: 14px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--volt-500);
}

.page-about .ab-reason-h {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .ab-reason-p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-text);
  opacity: .78;
}

/* 收尾 */
.page-about .ab-outro {
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1px solid var(--silver-200);
}

.page-about .ab-outro p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-text);
  opacity: .82;
}

.page-about .ab-outro a {
  color: var(--volt-700);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 107, 255, .35);
  transition: border-color .16s ease, color .16s ease;
}

.page-about .ab-outro a:hover {
  color: var(--volt-500);
  border-bottom-color: var(--volt-500);
}

@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-stat {
    padding: 26px 20px 24px;
  }
  .page-about .ab-reasons {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: 5fr 7fr;
    gap: 64px;
    margin-top: 48px;
  }

  .page-about .ab-split {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-top: 8px;
    border-left: 1px solid var(--silver-200);
    padding-left: 16px;
  }

  .page-about .ab-sec--dark .ab-rail {
    border-left-color: var(--rule-dark);
  }

  .page-about .ab-rail-label {
    font-size: 11px;
    line-height: 1.6;
    letter-spacing: .1em;
  }

  .page-about .ab-hero-art {
    justify-self: end;
  }

  .page-about .ab-team-grid {
    grid-template-columns: 1.12fr .88fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-fig--team {
    margin-top: -12px;
  }

  .page-about .ab-step {
    grid-template-columns: 56px minmax(0, 1fr);
    padding: 24px 16px 24px 10px;
  }
}

@media (min-width: 1120px) {
  .page-about .ab-stat-v {
    font-size: 42px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-arrow-link::after,
  .page-about .ab-node-dot,
  .page-about .ab-reason,
  .page-about .ab-step,
  .page-about .crumbs-list a {
    transition: none;
  }
  .page-about .ab-reason:hover {
    transform: none;
  }
  .page-about .ab-node:hover .ab-node-dot {
    transform: none;
  }
}