.page-about {
  --about-block: clamp(56px, 7vw, 112px);
  --about-text-dim: #c3cdc7;
  background: var(--a9-bg);
  color: var(--a9-text);
}

.page-about .a9-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 24px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--a9-stone);
}

.page-about .a9-breadcrumb a {
  color: var(--a9-text-soft);
  text-decoration: none;
  transition: color 0.25s var(--a9-ease);
}

.page-about .a9-breadcrumb a:hover {
  color: var(--a9-lime);
}

/* ---------- 首屏 ---------- */
.about-hero {
  padding: clamp(26px, 4vw, 52px) 0 var(--about-block);
}

.about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
}

.about-hero__index {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-left: 1px solid var(--a9-line);
}

.about-hero__index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 0 8px 14px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--a9-text-soft);
  text-decoration: none;
  transition: color 0.25s var(--a9-ease), background 0.25s var(--a9-ease);
}

.about-hero__index a:hover {
  color: var(--a9-lime);
  background: linear-gradient(90deg, rgba(201, 247, 58, 0.08), transparent);
}

.about-hero__index .a9-num {
  font-size: 11px;
  color: var(--a9-stone);
}

.about-hero h1 {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  font-size: clamp(36px, 6.4vw, 76px);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.about-hero h1 strong {
  font-weight: 700;
  color: var(--a9-lime);
}

.about-hero__lede {
  margin: 0 0 clamp(30px, 4vw, 48px);
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--about-text-dim);
}

.about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--a9-line);
  border-top: 1px solid var(--a9-line);
  border-bottom: 1px solid var(--a9-line);
}

.about-hero__stat {
  background: var(--a9-ink);
  padding: 20px 16px 18px;
}

.about-hero__figure {
  display: block;
  font-size: clamp(30px, 4.4vw, 50px);
  line-height: 1;
  color: var(--a9-white);
  letter-spacing: -0.02em;
}

.about-hero__stat--lime .about-hero__figure {
  color: var(--a9-lime);
}

.about-hero__cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.5;
  color: var(--a9-text-soft);
}

/* ---------- 通用区块 ---------- */
.about-section {
  padding: 0 0 var(--about-block);
}

.about-railgrid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

.about-rail {
  padding-left: 18px;
  border-left: 1px solid var(--a9-line-strong);
}

.about-rail__year {
  margin: 0;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--a9-lime);
}

.about-rail__label {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--a9-stone);
}

.about-body h2 {
  margin: 0 0 clamp(16px, 2vw, 22px);
  font-size: clamp(24px, 3.2vw, 38px);
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--a9-text);
}

.about-body h2 strong {
  font-weight: 700;
  color: var(--a9-white);
}

.about-body__lede {
  margin: 0 0 clamp(24px, 3vw, 34px);
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--a9-text-soft);
}

.about-prose p {
  margin: 0 0 18px;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-text-dim);
}

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

/* ---------- 图片 ---------- */
.about-figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .a9-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--a9-radius);
  background: linear-gradient(145deg, var(--a9-moss), var(--a9-ink) 70%);
  max-width: 100%;
}

.page-about .a9-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .a9-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(244, 241, 232, 0.22) 0.5px, transparent 0.5px);
  background-size: 4px 4px;
  opacity: 0.35;
  mix-blend-mode: overlay;
}

.page-about .a9-media__caption {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--a9-stone);
}

/* ---------- 横向流程带 ---------- */
.about-flow {
  padding: clamp(52px, 7vw, 100px) 0;
  margin: 0 0 var(--about-block);
  background: linear-gradient(120deg, var(--a9-bg-deep) 0%, #15302a 55%, var(--a9-moss) 100%);
}

.about-flow__title {
  margin: 0 0 clamp(28px, 4vw, 48px);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--a9-white);
}

.about-flow__title strong {
  font-weight: 700;
  color: var(--a9-lime);
}

.about-flow__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.about-step {
  position: relative;
  padding: 0 0 34px 34px;
}

.about-step::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 4px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--a9-lime), rgba(201, 247, 58, 0.1));
}

.about-step:last-child {
  padding-bottom: 0;
}

.about-step:last-child::before {
  background: linear-gradient(180deg, var(--a9-lime), transparent);
}

.about-step::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--a9-lime);
  box-shadow: 0 0 0 4px rgba(201, 247, 58, 0.14);
}

.about-step__no {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--a9-lime);
}

.about-step__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 700;
  color: var(--a9-white);
}

.about-step p {
  margin: 0;
  max-width: 30em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--a9-text-soft);
}

.about-figure--flow {
  margin-top: 0;
}

/* ---------- 岗位 ---------- */
.about-posts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.about-post {
  padding: 24px 22px;
  border-radius: var(--a9-radius);
  background: var(--a9-panel);
  border: 1px solid var(--a9-line);
  transition: border-color 0.28s var(--a9-ease), background 0.28s var(--a9-ease), transform 0.28s var(--a9-ease);
}

.about-post:hover {
  border-color: rgba(201, 247, 58, 0.42);
  background: var(--a9-panel-strong);
  transform: translateY(-4px);
}

.about-post__head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.about-post__dot {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--a9-lime);
}

.about-post__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--a9-white);
}

.about-post__count {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--a9-stone);
}

.about-post__fields {
  list-style: none;
  margin: 14px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--a9-line);
  display: grid;
  gap: 8px;
}

.about-post__fields li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--a9-text-soft);
}

.about-post__fields li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 1px;
  background: var(--a9-stone);
}

/* ---------- 时间轴 ---------- */
.about-timeline {
  border-top: 1px solid var(--a9-line-strong);
}

.about-timeline .a9-accordion__item {
  border-bottom: 1px solid var(--a9-line);
}

.about-timeline .a9-accordion__trigger {
  display: grid;
  grid-template-columns: minmax(72px, 106px) minmax(0, 1fr) 22px;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 2px 18px;
  width: 100%;
  margin: 0;
  padding: 24px 8px 24px 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 0.28s var(--a9-ease);
}

.about-timeline .a9-accordion__trigger:hover {
  background: linear-gradient(90deg, rgba(201, 247, 58, 0.06), transparent);
}

.about-timeline .a9-accordion__trigger[aria-expanded="true"] {
  background: linear-gradient(90deg, rgba(201, 247, 58, 0.1), transparent);
}

.about-timeline__year {
  grid-row: 1 / span 2;
  font-size: clamp(21px, 3vw, 34px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--a9-lime);
}

.about-timeline__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--a9-white);
}

.about-timeline__hint {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--a9-stone);
  transition: color 0.25s var(--a9-ease);
}

.about-timeline .a9-accordion__trigger:hover .about-timeline__hint {
  color: var(--a9-text-soft);
}

.about-timeline__mark {
  grid-row: 1 / span 2;
  position: relative;
  justify-self: end;
  align-self: center;
  width: 18px;
  height: 18px;
}

.about-timeline__mark::before,
.about-timeline__mark::after {
  content: "";
  position: absolute;
  background: var(--a9-lime);
  transition: transform 0.28s var(--a9-ease), opacity 0.28s var(--a9-ease);
}

.about-timeline__mark::before {
  left: 0;
  top: 8.25px;
  width: 18px;
  height: 1.5px;
}

.about-timeline__mark::after {
  left: 8.25px;
  top: 0;
  width: 1.5px;
  height: 18px;
}

.about-timeline .a9-accordion__trigger[aria-expanded="true"] .about-timeline__mark::after {
  transform: rotate(90deg);
  opacity: 0;
}

.about-timeline .a9-accordion__panel {
  padding: 0 8px 26px 0;
}

.about-timeline .a9-accordion__panel p {
  margin: 0 0 12px;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--about-text-dim);
}

.about-timeline .a9-accordion__panel p:last-child {
  margin-bottom: 0;
}

/* ---------- 覆盖与合作 ---------- */
.about-leagues {
  list-style: none;
  margin: 0 0 clamp(26px, 3vw, 36px);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.about-league {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  border-radius: var(--a9-pill);
  border: 1px solid var(--a9-line-strong);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--a9-text);
}

.about-league--key {
  border-color: rgba(201, 247, 58, 0.5);
  color: var(--a9-lime);
}

.about-partners {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--a9-line);
  border-radius: var(--a9-radius);
  overflow: hidden;
}

.about-partner {
  background: var(--a9-bg-deep);
  padding: 22px 20px;
}

.about-partner__num {
  display: block;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  color: var(--a9-lime);
  letter-spacing: -0.02em;
}

.about-partner__cap {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  line-height: 1.55;
  color: var(--a9-text-soft);
}

/* ---------- 收尾 ---------- */
.about-contact {
  padding: clamp(110px, 16vw, 210px) 0 clamp(56px, 8vw, 96px);
  background: linear-gradient(180deg, var(--a9-bg) 0%, #14322a 30%, var(--a9-paper) 66%, var(--a9-paper) 100%);
  color: var(--a9-ink);
}

.about-contact__inner {
  max-width: 720px;
}

.about-contact h2 {
  margin: 0 0 18px;
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--a9-ink);
}

.about-contact h2 strong {
  font-weight: 700;
}

.about-contact p {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: #2b3a33;
}

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

.page-about .about-contact .a9-btn--ghost {
  color: var(--a9-ink);
  border-color: rgba(10, 27, 22, 0.32);
}

.page-about .about-contact .a9-btn--ghost:hover {
  border-color: var(--a9-ink);
}

.about-contact__links {
  list-style: none;
  margin: 34px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid rgba(10, 27, 22, 0.16);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
}

.about-contact__links a {
  color: var(--a9-ink);
  font-size: 14px;
  letter-spacing: 0.03em;
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(10, 27, 22, 0.28);
  transition: border-color 0.25s var(--a9-ease), color 0.25s var(--a9-ease);
}

.about-contact__links a:hover {
  border-color: var(--a9-ink);
  color: #0f4030;
}

.about-contact__note {
  margin: 24px 0 0;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: #4a5a52;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .about-posts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .about-steps {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 32px);
  }

  .about-step {
    padding: 32px 18px 0 0;
  }

  .about-step::before {
    left: 15px;
    right: -18px;
    top: 7px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--a9-lime), rgba(201, 247, 58, 0.12));
  }

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

  .about-step::after {
    left: 0;
    top: 2px;
  }

  .about-timeline .a9-accordion__panel {
    padding-left: 124px;
  }
}

@media (min-width: 920px) {
  .about-hero__grid {
    grid-template-columns: minmax(150px, 210px) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 88px);
    align-items: start;
  }

  .about-hero__rail {
    position: sticky;
    top: 112px;
  }

  .about-railgrid {
    grid-template-columns: minmax(130px, 190px) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 92px);
  }

  .about-rail {
    position: sticky;
    top: 120px;
    align-self: start;
  }
}

@media (min-width: 960px) {
  .about-flow__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .about-figure--flow {
    margin-top: 6px;
  }
}

@media (min-width: 1120px) {
  .about-posts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) and (hover: hover) {
  .about-post__fields {
    max-height: 0;
    margin-top: 14px;
    padding-top: 0;
    border-top-color: transparent;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.32s var(--a9-ease), opacity 0.28s var(--a9-ease), padding-top 0.32s var(--a9-ease), border-color 0.28s var(--a9-ease);
  }

  .about-post:hover .about-post__fields {
    max-height: 220px;
    padding-top: 14px;
    border-top-color: var(--a9-line);
    opacity: 1;
  }
}

@media (max-width: 420px) {
  .about-timeline .a9-accordion__trigger {
    grid-template-columns: minmax(0, 1fr) 22px;
    grid-template-rows: auto auto auto;
    gap: 4px 14px;
  }

  .about-timeline__year {
    grid-row: auto;
    grid-column: 1 / -1;
  }

  .about-timeline__mark {
    grid-row: 1 / span 3;
    grid-column: 2;
  }

  .about-timeline .a9-accordion__panel {
    padding-left: 0;
  }
}