.page-about {
  --about-hair: rgba(217, 227, 235, .12);
  --about-hair-soft: rgba(217, 227, 235, .08);
  --about-cut: 12px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 76px) 0 0;
  background:
    radial-gradient(120% 88% at 86% 0%, rgba(55, 199, 255, .17), transparent 58%),
    radial-gradient(92% 72% at 0% 100%, rgba(169, 230, 60, .09), transparent 62%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-800) 100%);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4.5vw, 52px);
  align-items: start;
}

.page-about .about-hero .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .8125rem;
  color: var(--slate);
  margin-bottom: 20px;
}

.page-about .about-hero .breadcrumbs__link {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-hero .breadcrumbs__link:hover {
  color: var(--summer);
  border-bottom-color: var(--summer);
}

.page-about .about-hero .breadcrumbs__item {
  color: var(--text-soft);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  color: var(--text);
  max-width: 15ch;
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 0;
  color: var(--text-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(180deg, rgba(27, 39, 48, .94), rgba(17, 26, 33, .94));
  border: 1px solid var(--about-hair);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  overflow: hidden;
}

.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--spring), var(--summer), var(--autumn), var(--winter));
}

.page-about .about-hero__panel-label {
  margin: 0;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin-top: 20px;
}

.page-about .about-figure {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-figure__num {
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  line-height: 1.1;
  letter-spacing: .04em;
}

.page-about .about-figure:nth-child(1) .about-figure__num { color: var(--spring); }
.page-about .about-figure:nth-child(2) .about-figure__num { color: var(--summer); }
.page-about .about-figure:nth-child(3) .about-figure__num { color: var(--autumn); }
.page-about .about-figure:nth-child(4) .about-figure__num { color: var(--winter); }

.page-about .about-figure__cap {
  font-size: .8125rem;
  line-height: 1.5;
  color: var(--slate);
}

.page-about .about-hero__panel-note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-hair-soft);
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 索引条 ---------- */
.page-about .about-archive {
  margin-top: clamp(32px, 5.5vw, 60px);
  padding: 18px 0 22px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-archive__list {
  display: flex;
  gap: clamp(16px, 2.6vw, 38px);
  margin: 14px 0 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-archive__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-archive__list a {
  display: flex;
  flex-direction: column;
  gap: 3px;
  white-space: nowrap;
  text-decoration: none;
  padding-bottom: 5px;
  border-bottom: 2px solid transparent;
  transition: border-color .25s var(--ease);
}

.page-about .about-archive__list a:hover {
  border-bottom-color: var(--summer);
}

.page-about .about-archive__list .mono {
  font-size: 1.0625rem;
  color: var(--text);
}

.page-about .about-archive__txt {
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--slate);
}

/* ---------- 通用标题 ---------- */
.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.8vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--text);
  margin: 10px 0 16px;
}

.page-about .about-lede {
  max-width: 62ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .section--paper .about-h2 {
  color: var(--paper-ink);
}

.page-about .section--paper .about-lede {
  color: rgba(23, 19, 16, .74);
}

.page-about .section--paper .label {
  color: rgba(23, 19, 16, .55);
}

/* ---------- 起点 ---------- */
.page-about .about-start {
  background: var(--ink-950);
}

.page-about .about-start__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.5vw, 48px);
}

.page-about .about-start__body p {
  margin: 0 0 18px;
  color: var(--text-soft);
  line-height: 1.85;
  max-width: 64ch;
}

.page-about .about-claims {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-claims li {
  position: relative;
  padding-left: 26px;
  color: var(--text);
  line-height: 1.7;
}

.page-about .about-claims li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 14px;
  height: 2px;
  background: var(--spring);
}

.page-about .about-claims li:nth-child(2)::before { background: var(--summer); }
.page-about .about-claims li:nth-child(3)::before { background: var(--autumn); }

/* ---------- 四季 ---------- */
.page-about .about-seasons {
  background: var(--paper-50);
}

.page-about .about-seasons__list {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-season {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px 20px;
  align-items: start;
  padding: 22px 20px;
  background: #fff;
  border-left: 4px solid var(--spring);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-season:hover {
  transform: translateX(4px);
  box-shadow: 0 14px 32px rgba(23, 19, 16, .09);
}

.page-about .about-season--spring { border-left-color: var(--spring); }
.page-about .about-season--summer { border-left-color: var(--summer); }
.page-about .about-season--autumn { border-left-color: var(--autumn); }
.page-about .about-season--winter { border-left-color: #9FB4C6; }

.page-about .about-season__key {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--paper-ink);
  background: var(--paper-300);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.page-about .about-season--spring .about-season__key { background: var(--spring); }
.page-about .about-season--summer .about-season__key { background: var(--summer); }
.page-about .about-season--autumn .about-season__key { background: var(--autumn); }
.page-about .about-season--winter .about-season__key { background: var(--winter); }

.page-about .about-season__text h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--paper-ink);
  letter-spacing: -.005em;
}

.page-about .about-season__text p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(23, 19, 16, .72);
}

.page-about .about-season__meta {
  grid-column: 2;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: rgba(23, 19, 16, .55);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--ink-800);
}

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

.page-about .about-team__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.86) brightness(.86);
}

.page-about .about-team__head {
  max-width: 68ch;
}

.page-about .about-stack {
  display: flex;
  height: 58px;
  margin-top: clamp(26px, 4vw, 40px);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-stack__seg {
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: .9375rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ink-950);
}

.page-about .about-stack__seg--edit { flex: 22 1 0; background: var(--spring); }
.page-about .about-stack__seg--data { flex: 14 1 0; background: var(--summer); }
.page-about .about-stack__seg--prod { flex: 10 1 0; background: var(--autumn); }

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

.page-about .about-role {
  padding-top: 18px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-role__name {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-role__num {
  font-size: .8125rem;
  color: var(--summer);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--text-soft);
  max-width: 62ch;
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  background: var(--ink-950);
}

.page-about .about-flow__head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 38px);
}

.page-about .about-flow__list .accordion__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
}

.page-about .about-flow__name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -.005em;
}

.page-about .about-flow__time {
  font-size: .8125rem;
  color: var(--autumn);
}

.page-about .about-flow__list .accordion__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 66ch;
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  background: var(--ink-800);
}

.page-about .about-partners__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4.5vw, 56px);
  align-items: start;
}

.page-about .about-partners__copy p {
  margin: 0 0 16px;
  color: var(--text-soft);
  line-height: 1.85;
  max-width: 58ch;
}

.page-about .about-partners__points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-partners__points li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-hair-soft);
  color: var(--text);
  font-size: .9375rem;
  line-height: 1.7;
}

.page-about .about-partners__points .mono {
  font-size: .75rem;
  color: var(--summer);
}

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

.page-about .about-partners__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.9) brightness(.82);
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones {
  background: var(--ink-950);
}

.page-about .about-milestones__media {
  margin: clamp(26px, 4vw, 44px) 0 clamp(30px, 4.5vw, 52px);
}

.page-about .about-milestones__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.8) brightness(.62);
}

.page-about .about-milestones__track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-milestone {
  position: relative;
  padding: 20px 18px 20px 22px;
  background: rgba(27, 39, 48, .6);
  border-left: 3px solid var(--winter);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background .3s var(--ease), transform .3s var(--ease);
}

.page-about .about-milestone--spring { border-left-color: var(--spring); }
.page-about .about-milestone--summer { border-left-color: var(--summer); }
.page-about .about-milestone--autumn { border-left-color: var(--autumn); }
.page-about .about-milestone--winter { border-left-color: var(--winter); }
.page-about .about-milestone--now { border-left-color: var(--coral); }

.page-about .about-milestone__year {
  display: block;
  font-size: 1.0625rem;
  letter-spacing: .06em;
  color: var(--text);
  margin-bottom: 8px;
}

.page-about .about-milestone h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -.005em;
}

.page-about .about-milestone p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--slate);
}

@media (min-width: 900px) {
  .page-about .about-milestones__track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 16px;
    border-top: 1px solid var(--about-hair);
    padding-top: 0;
  }

  .page-about .about-milestone {
    border-left: 0;
    border-top: 3px solid var(--winter);
    background: transparent;
    padding: 22px 12px 18px 0;
    clip-path: none;
  }

  .page-about .about-milestone--spring { border-top-color: var(--spring); }
  .page-about .about-milestone--summer { border-top-color: var(--summer); }
  .page-about .about-milestone--autumn { border-top-color: var(--autumn); }
  .page-about .about-milestone--winter { border-top-color: var(--winter); }
  .page-about .about-milestone--now { border-top-color: var(--coral); }

  .page-about .about-milestone:hover,
  .page-about .about-milestone:focus-within {
    background: rgba(27, 39, 48, .72);
    transform: translateY(-4px);
  }

  .page-about .about-milestone p {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .38s var(--ease), opacity .3s var(--ease);
  }

  .page-about .about-milestone:hover p,
  .page-about .about-milestone:focus-within p {
    max-height: 140px;
    opacity: 1;
  }
}

/* ---------- 与我们同行 ---------- */
.page-about .about-join {
  padding: clamp(52px, 8vw, 104px) 0;
  background:
    radial-gradient(110% 120% at 100% 0%, rgba(255, 158, 61, .13), transparent 58%),
    linear-gradient(180deg, var(--ink-800), var(--ink-950));
}

.page-about .about-join__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-join__copy p {
  margin: 0;
  max-width: 56ch;
  color: var(--text-soft);
  line-height: 1.85;
}

.page-about .about-join__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-join__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  text-decoration: none;
  color: var(--text);
  font-size: .9375rem;
  background: rgba(27, 39, 48, .68);
  border-left: 3px solid var(--spring);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background .28s var(--ease), border-color .28s var(--ease);
}

.page-about .about-join__links li:nth-child(2) a { border-left-color: var(--summer); }
.page-about .about-join__links li:nth-child(3) a { border-left-color: var(--autumn); }
.page-about .about-join__links li:nth-child(4) a { border-left-color: var(--winter); }
.page-about .about-join__links li:nth-child(5) a { border-left-color: var(--coral); }

.page-about .about-join__links a:hover {
  background: rgba(55, 199, 255, .12);
}

.page-about .about-join__arrow {
  font-family: var(--font-mono);
  color: var(--summer);
  transition: transform .28s var(--ease);
}

.page-about .about-join__links a:hover .about-join__arrow {
  transform: translateX(6px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-start__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-season {
    grid-template-columns: 60px minmax(0, 1fr) 210px;
    align-items: center;
  }

  .page-about .about-season__meta {
    grid-column: 3;
    text-align: right;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .about-partners__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-join__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(28px, 4vw, 56px);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-hero__panel {
    margin-top: 76px;
  }
}

@media (max-width: 480px) {
  .page-about .about-season {
    grid-template-columns: 46px minmax(0, 1fr);
    padding: 18px 16px;
  }

  .page-about .about-season__key {
    width: 42px;
    height: 42px;
    font-size: 1.15rem;
  }

  .page-about .about-stack {
    height: 46px;
  }

  .page-about .about-stack__seg {
    font-size: .8125rem;
  }

  .page-about .about-flow__name {
    font-size: 1.0625rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-season,
  .page-about .about-milestone,
  .page-about .about-join__links a,
  .page-about .about-join__arrow,
  .page-about .about-archive__list a {
    transition: none;
  }

  .page-about .about-season:hover,
  .page-about .about-milestone:hover,
  .page-about .about-join__links a:hover .about-join__arrow {
    transform: none;
  }
}