.page-about {
  --about-rail: 176px;
  padding-bottom: 84px;
}

.page-about .breadcrumb {
  padding-top: 22px;
}

/* ---------- hero ---------- */

.page-about .about-hero {
  position: relative;
  margin-top: 18px;
  padding: 34px 0 50px;
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(115% 88% at 88% 6%, rgba(45, 107, 255, 0.17), transparent 62%),
    radial-gradient(90% 70% at 6% 96%, rgba(228, 87, 46, 0.12), transparent 66%),
    linear-gradient(180deg, rgba(27, 35, 51, 0.72) 0%, rgba(11, 13, 18, 0) 78%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-hero .display-1 {
  margin: 14px 0 18px;
  font-size: clamp(34px, 7.2vw, 74px);
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-about .about-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__visual {
  position: relative;
  height: 206px;
  padding: 24px 20px 18px;
  display: flex;
  align-items: flex-end;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-cut);
  background: linear-gradient(155deg, rgba(26, 18, 12, 0.94), rgba(11, 13, 18, 0.98));
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 18px;
  height: 1px;
  background: var(--line-gold);
}

.page-about .hero-meter {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  width: 100%;
  height: 100%;
}

.page-about .hero-meter > span {
  flex: 1 1 0;
  min-width: 0;
  height: var(--h, 40%);
  border-radius: 1px 1px 0 0;
  background: linear-gradient(180deg, var(--blue), rgba(45, 107, 255, 0.14));
}

.page-about .hero-meter > span:nth-child(3n) {
  background: linear-gradient(180deg, var(--flame), rgba(228, 87, 46, 0.14));
}

.page-about .hero-meter > span:nth-child(6n) {
  background: linear-gradient(180deg, var(--pulse), rgba(185, 255, 59, 0.14));
}

/* ---------- 主区两栏 ---------- */

.page-about .about-body {
  margin-top: 46px;
  display: grid;
  gap: 30px;
}

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

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list > li {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-cut);
  background: rgba(26, 18, 12, 0.72);
  color: var(--cream);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-rail__yr {
  font-size: 15px;
  color: var(--flame);
}

.page-about .about-rail__note {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--blue);
  background: rgba(45, 107, 255, 0.16);
}

/* ---------- 章节 ---------- */

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

.page-about .about-section {
  padding: 42px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section .display-2 {
  margin: 14px 0 20px;
  font-size: clamp(25px, 4.6vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 22ch;
}

.page-about .about-section .lede {
  margin: 0 0 8px;
}

/* ---------- 起步与规模 ---------- */

.page-about .about-split {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .about-split__text p {
  margin: 0 0 16px;
  color: var(--cream);
  line-height: 1.78;
}

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

.page-about .media-frame {
  position: relative;
  margin: 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-cut);
  background: var(--zone);
}

.page-about .media-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  display: block;
}

.page-about .media-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.page-about .media-frame--1x1 {
  aspect-ratio: 1 / 1;
}

.page-about .about-facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line-gold);
  background: var(--line-soft);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: rgba(26, 18, 12, 0.9);
}

.page-about .about-fact__num {
  font-size: 27px;
  line-height: 1;
  color: var(--flame);
}

.page-about .about-fact__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

/* ---------- 数据流程 ---------- */

.page-about .flow-wrap {
  display: grid;
  gap: 28px;
  margin-top: 24px;
}

.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .flow-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-blue);
}

.page-about .flow-node {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .flow-dot {
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--blue);
  box-shadow: 0 0 0 3px rgba(45, 107, 255, 0.14);
}

.page-about .flow-title {
  margin: 0 0 6px;
  font-size: 19px;
  font-weight: 600;
  color: var(--cream);
}

.page-about .flow-node p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  gap: 28px;
  margin-top: 22px;
}

.page-about .team-main > p {
  margin: 0 0 22px;
  color: var(--cream);
  line-height: 1.78;
}

.page-about .team-bars {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.page-about .team-bar-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) 38px;
  align-items: center;
  gap: 12px;
}

.page-about .team-bar-name {
  font-size: 14px;
  color: var(--cream);
}

.page-about .team-bar-track {
  display: block;
  height: 8px;
  border-radius: 1px;
  background: rgba(242, 233, 218, 0.09);
  overflow: hidden;
}

.page-about .team-bar-fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  background: linear-gradient(90deg, var(--blue), var(--flame));
}

.page-about .team-bar-num {
  font-size: 16px;
  text-align: right;
  color: var(--flame);
}

.page-about .team-note {
  margin: 0;
  padding: 14px 16px;
  border-left: 2px solid var(--gold);
  background: rgba(242, 233, 218, 0.045);
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- 里程碑 ---------- */

.page-about .about-section--timeline {
  padding-bottom: 48px;
}

.page-about .timeline-hint {
  margin: 0 0 20px;
}

.page-about .ms-track {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 16px 4px 26px;
  margin: 0 -4px;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.page-about .ms-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 14px;
  min-width: max-content;
}

.page-about .ms-item {
  flex: 0 0 234px;
  scroll-snap-align: start;
  padding: 24px 22px 26px;
  border: 1px solid var(--line-gold);
  background: linear-gradient(158deg, rgba(26, 18, 12, 0.96), rgba(27, 35, 51, 0.88));
  clip-path: polygon(0 0, 100% 0, calc(100% - 18px) 100%, 0 100%);
  transition: border-color 200ms var(--ease);
}

.page-about .ms-item--blue {
  background: linear-gradient(158deg, rgba(27, 35, 51, 0.96), rgba(26, 18, 12, 0.88));
}

.page-about .ms-item:hover,
.page-about .ms-item:focus-within {
  border-color: var(--blue);
}

.page-about .ms-item:target {
  border-color: var(--pulse);
}

.page-about .ms-year {
  margin: 0;
  font-size: 42px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--flame);
}

.page-about .ms-item--blue .ms-year {
  color: var(--blue);
}

.page-about .ms-item:target .ms-year {
  color: var(--pulse);
}

.page-about .ms-title {
  margin: 14px 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--cream);
}

.page-about .ms-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- 资质 ---------- */

.page-about .cert-grid {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .cert-card {
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-cut);
  background: rgba(26, 18, 12, 0.84);
  overflow: hidden;
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .cert-card[open] {
  border-color: var(--blue);
  background: rgba(27, 35, 51, 0.92);
}

.page-about .cert-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 18px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .cert-head::-webkit-details-marker {
  display: none;
}

.page-about .cert-tag {
  align-self: flex-start;
  padding: 3px 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-cut);
}

.page-about .cert-name {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .cert-body {
  margin: 0;
  padding: 14px 18px 20px;
  border-top: 1px solid var(--line-soft);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 合作生态 ---------- */

.page-about .partner-grid {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.page-about .partner-card {
  padding: 22px 20px 24px;
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--blue);
  border-radius: var(--radius-cut);
  background: rgba(27, 35, 51, 0.72);
}

.page-about .partner-card:nth-child(2) {
  border-top-color: var(--flame);
}

.page-about .partner-card:nth-child(3) {
  border-top-color: var(--pulse);
}

.page-about .partner-title {
  margin: 10px 0 8px;
  font-size: 19px;
  font-weight: 600;
  color: var(--cream);
}

.page-about .partner-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  margin-top: 26px;
  padding: 30px 24px;
  display: grid;
  gap: 22px;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-cut);
  background:
    linear-gradient(118deg, rgba(228, 87, 46, 0.16), rgba(45, 107, 255, 0.13) 62%, rgba(11, 13, 18, 0) 100%),
    rgba(26, 18, 12, 0.88);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: 23px;
  font-weight: 600;
  line-height: 1.36;
  color: var(--cream);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 58ch;
  line-height: 1.76;
  color: var(--slate);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */

@media (min-width: 680px) {
  .page-about .about-hero__visual {
    height: 236px;
  }

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

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

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

@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }

  .page-about .about-split {
    grid-template-columns: 7fr 5fr;
    gap: 38px;
  }

  .page-about .flow-wrap {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 34px;
    padding: 34px;
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

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

  .page-about .about-rail__label {
    margin-bottom: 14px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list > li {
    width: 100%;
  }

  .page-about .about-rail__link {
    position: relative;
    display: flex;
    width: 100%;
    justify-content: space-between;
    padding: 9px 0 9px 15px;
    border: 0;
    border-left: 1px solid var(--line-soft);
    border-radius: 0;
    background: transparent;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -3.5px;
    top: 50%;
    width: 6px;
    height: 6px;
    margin-top: -3px;
    border-radius: 50%;
    background: var(--line-gold);
    transition: background 180ms var(--ease), box-shadow 180ms var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: transparent;
    border-left-color: var(--blue);
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    background: var(--pulse);
    box-shadow: 0 0 0 4px rgba(185, 255, 59, 0.16);
  }

  .page-about .about-section {
    padding: 52px 0;
  }

  .page-about .about-rail__note {
    font-size: 12.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .ms-item,
  .page-about .cert-card,
  .page-about .about-rail__link::before {
    transition: none;
  }
}

.page-about {
  --h: 1rem;
  --w: 1rem;
}