.page-about {
  --about-paper-mute: #6E6152;
  --about-paper-line: rgba(36, 26, 18, .16);
  --about-paper-card: rgba(255, 255, 255, .62);
  --about-gap: clamp(20px, 3vw, 44px);
  background: var(--c-ink);
  color: var(--c-paper);
}

.page-about .about-paper {
  background: var(--c-paper);
  color: var(--c-brown);
  border-radius: clamp(24px, 4vw, 48px);
  margin: 0 clamp(6px, 1.4vw, 18px);
  padding: clamp(40px, 6vw, 88px) 0;
}

.page-about .about-paper .eyebrow {
  color: var(--about-paper-mute);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4vw, 52px) 0 clamp(44px, 6vw, 88px);
  background:
    linear-gradient(168deg, rgba(12, 58, 45, .9) 0%, rgba(6, 35, 28, 0) 62%),
    var(--c-ink);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 30% -220px 30%;
  height: 340px;
  background: radial-gradient(closest-side, rgba(44, 230, 192, .16), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(22px, 3vw, 40px);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-hero__lead h1 {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -.01em;
  margin: 14px 0 18px;
  color: var(--c-paper);
  max-width: 22ch;
}

.page-about .about-hero__lead .lede {
  max-width: 62ch;
  color: #C9D8D2;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.9;
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .hero-stat {
  background: linear-gradient(158deg, rgba(20, 81, 63, .78), rgba(12, 58, 45, .5));
  border: 1px solid var(--c-edge);
  border-radius: var(--r-md);
  padding: 16px 18px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.page-about .hero-stat__num {
  display: block;
  font-family: var(--f-num);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: -.02em;
}

.page-about .hero-stat__num small {
  font-size: .42em;
  margin-left: 2px;
  color: inherit;
  opacity: .8;
}

.page-about .hero-stat__num--orange {
  color: var(--c-orange);
}

.page-about .hero-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-mist);
}

/* ---------- 通用章节头 ---------- */

.page-about .about-head {
  max-width: 76ch;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-about .about-head h2 {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.2;
  letter-spacing: -.005em;
  margin: 10px 0 14px;
  color: var(--c-brown);
}

.page-about .about-head--dark h2 {
  color: var(--c-paper);
}

.page-about .about-head__lede {
  font-size: clamp(15px, 1.3vw, 16.5px);
  line-height: 1.9;
  color: var(--about-paper-mute);
  margin: 0;
}

.page-about .about-head--dark .about-head__lede {
  color: #BFD2CB;
}

/* ---------- 三条产品线 ---------- */

.page-about .doing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .doing-card {
  position: relative;
  background: var(--about-paper-card);
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-lg);
  padding: clamp(20px, 2.6vw, 30px);
  box-shadow: 0 14px 32px -26px rgba(36, 26, 18, .6);
}

.page-about .doing-card::before {
  content: "";
  position: absolute;
  left: clamp(20px, 2.6vw, 30px);
  top: 0;
  width: 46px;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: var(--c-edge);
}

.page-about .doing-card--cyan::before { background: var(--c-cyan); }
.page-about .doing-card--orange::before { background: var(--c-orange); }

.page-about .doing-card__no {
  font-family: var(--f-num);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--about-paper-mute);
  margin: 8px 0 10px;
}

.page-about .doing-card__title {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.32;
  margin: 0 0 12px;
  color: var(--c-brown);
}

.page-about .doing-card__body {
  font-size: 15px;
  line-height: 1.88;
  color: #41332A;
  margin: 0 0 16px;
}

.page-about .doing-card__tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--about-paper-mute);
  border-top: 1px dashed var(--about-paper-line);
  padding-top: 12px;
  margin: 0;
  width: 100%;
}

/* ---------- 配图 ---------- */

.page-about .about-figure {
  margin: clamp(28px, 4vw, 52px) 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--c-panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
}

.page-about .about-figure figcaption {
  font-size: 13px;
  line-height: 1.75;
  color: var(--about-paper-mute);
  padding: 12px 4px 0;
}

.page-about .about-figure--flow {
  background: none;
}

.page-about .about-figure--flow figcaption {
  color: var(--about-paper-mute);
}

/* ---------- 赛季演进 ---------- */

.page-about .about-evolution {
  padding: clamp(44px, 6vw, 92px) 0;
  background:
    linear-gradient(190deg, rgba(12, 58, 45, .55) 0%, rgba(6, 35, 28, 0) 55%),
    var(--c-ink);
}

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

.page-about .about-years__title {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-mist);
  margin: 0 0 10px;
}

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

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

.page-about .about-year-link {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--c-edge);
  border-radius: var(--r-pill);
  font-family: var(--f-num);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--c-mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-year-link:hover,
.page-about .about-year-link:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
  background: rgba(44, 230, 192, .08);
}

.page-about .about-evolution__body {
  display: grid;
  gap: 14px;
}

.page-about .phase {
  position: relative;
  background: linear-gradient(155deg, rgba(20, 81, 63, .5), rgba(12, 58, 45, .3));
  border: 1px solid var(--c-edge);
  border-radius: var(--r-md);
  padding: clamp(18px, 2.4vw, 28px);
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .phase:target {
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 1px var(--c-cyan), 0 18px 40px -24px rgba(44, 230, 192, .6);
}

.page-about .phase__span {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-mist);
}

.page-about .phase__num {
  font-family: var(--f-num);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-orange);
  letter-spacing: -.02em;
}

.page-about .phase__title {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.36;
  margin: 0 0 10px;
  color: var(--c-paper);
}

.page-about .phase__body {
  font-size: 15px;
  line-height: 1.88;
  color: #B9CCC5;
  margin: 0;
}

/* ---------- 四步流程 ---------- */

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .flow__step {
  position: relative;
  background: var(--about-paper-card);
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-md);
  padding: clamp(18px, 2.2vw, 24px);
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .flow__step:hover,
.page-about .flow__step:focus-within {
  border-color: var(--c-edge);
  box-shadow: 0 16px 34px -26px rgba(36, 26, 18, .75);
}

.page-about .flow__num {
  display: block;
  font-family: var(--f-num);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--c-orange);
  line-height: 1;
  margin-bottom: 12px;
}

.page-about .flow__title {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 18px;
  margin: 0 0 10px;
  color: var(--c-brown);
}

.page-about .flow__desc {
  font-size: 14.5px;
  line-height: 1.85;
  color: #41332A;
  margin: 0;
}

.page-about .flow__more {
  font-size: 13px;
  line-height: 1.8;
  color: var(--about-paper-mute);
  border-top: 1px dashed var(--about-paper-line);
  padding-top: 10px;
  max-height: 220px;
  opacity: 1;
  margin-top: 12px;
  overflow: hidden;
  transition: max-height 240ms var(--ease), opacity 200ms var(--ease), margin 240ms var(--ease), padding 240ms var(--ease);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding: clamp(44px, 6vw, 92px) 0;
  background: var(--c-ink);
}

.page-about .about-team .filter-bar {
  margin-bottom: 20px;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-card {
  background: linear-gradient(160deg, rgba(20, 81, 63, .58), rgba(12, 58, 45, .34));
  border: 1px solid var(--c-edge);
  border-radius: var(--r-md);
  padding: clamp(18px, 2.2vw, 26px);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-3px);
  border-color: var(--c-cyan);
}

.page-about .team-card__no {
  font-family: var(--f-num);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1;
  color: var(--c-cyan);
  margin: 0 0 14px;
}

.page-about .team-card__title {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.36;
  margin: 0 0 10px;
  color: var(--c-paper);
}

.page-about .team-card__body {
  font-size: 14.5px;
  line-height: 1.85;
  color: #B9CCC5;
  margin: 0 0 14px;
}

.page-about .team-card__meta {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-mist);
  border-top: 1px solid rgba(62, 107, 94, .6);
  padding-top: 12px;
  margin: 0;
}

/* ---------- 合作与资质 ---------- */

.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .partner-col {
  background: var(--about-paper-card);
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-lg);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .partner-col--accent {
  background: linear-gradient(150deg, rgba(44, 230, 192, .16), rgba(255, 122, 51, .1));
  border-color: rgba(36, 26, 18, .22);
}

.page-about .partner-col__num {
  font-family: var(--f-num);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--c-brown);
  margin: 0 0 14px;
}

.page-about .partner-col--accent .partner-col__num {
  color: #1F6E58;
}

.page-about .partner-col__title {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  margin: 0 0 10px;
  color: var(--c-brown);
}

.page-about .partner-col__body {
  font-size: 14.5px;
  line-height: 1.86;
  color: #41332A;
  margin: 0;
}

/* ---------- 长期负责 ---------- */

.page-about .about-duty {
  padding: clamp(44px, 6vw, 92px) 0 clamp(48px, 7vw, 104px);
  background:
    linear-gradient(200deg, rgba(12, 58, 45, .5) 0%, rgba(6, 35, 28, 0) 60%),
    var(--c-ink);
}

.page-about .duty-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--c-edge);
}

.page-about .duty-item {
  padding: clamp(20px, 2.6vw, 30px) 0;
  border-bottom: 1px solid var(--c-edge);
}

.page-about .duty-item__no {
  font-family: var(--f-num);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--c-orange);
  margin: 0 0 10px;
}

.page-about .duty-item__title {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.36;
  margin: 0 0 10px;
  color: var(--c-paper);
}

.page-about .duty-item__body {
  font-size: 14.5px;
  line-height: 1.88;
  color: #B9CCC5;
  margin: 0;
  max-width: 66ch;
}

.page-about .duty-cta {
  margin-top: clamp(26px, 3.6vw, 44px);
  background: linear-gradient(150deg, rgba(20, 81, 63, .62), rgba(12, 58, 45, .38));
  border: 1px solid var(--c-edge);
  border-radius: var(--r-lg);
  padding: clamp(22px, 2.8vw, 34px);
  display: grid;
  gap: 20px;
}

.page-about .duty-cta__text {
  font-size: 15px;
  line-height: 1.88;
  color: #C9D8D2;
  margin: 0;
  max-width: 62ch;
}

.page-about .duty-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .82fr);
    align-items: end;
  }

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

  .page-about .flow__step .flow__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
  }

  .page-about .flow__step:hover .flow__more,
  .page-about .flow__step:focus-within .flow__more {
    max-height: 220px;
    opacity: 1;
    margin-top: 12px;
    padding-top: 10px;
    border-top-color: var(--about-paper-line);
  }

  .page-about .duty-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 60px);
  }

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

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

@media (min-width: 960px) {
  .page-about .about-evolution__grid {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-years {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-about .about-years__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0 0 0 18px;
    border-left: 1px solid var(--c-edge);
  }

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

  .page-about .about-year-link {
    display: block;
    width: 100%;
    padding: 10px 0;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: 15px;
  }

  .page-about .about-year-link::before {
    content: "";
    position: absolute;
    left: -22.5px;
    top: 50%;
    width: 8px;
    height: 8px;
    margin-top: -4px;
    border-radius: 50%;
    background: var(--c-edge);
    transition: background 200ms var(--ease), transform 200ms var(--ease);
  }

  .page-about .about-year-link:hover::before,
  .page-about .about-year-link:focus-visible::before {
    background: var(--c-cyan);
    transform: scale(1.4);
  }

  .page-about .about-year-link:hover,
  .page-about .about-year-link:focus-visible {
    background: none;
    border: 0;
  }

  .page-about .phase:nth-child(even) {
    margin-left: clamp(0px, 3.5vw, 48px);
  }
}

@media (min-width: 1100px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .phase,
  .page-about .team-card,
  .page-about .flow__more,
  .page-about .about-year-link,
  .page-about .about-year-link::before {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}