.page-about {
  --ab-line: 1px solid rgba(199, 207, 206, .2);
  --ab-panel: linear-gradient(160deg, rgba(14, 43, 36, .92), rgba(17, 22, 19, .96));
  position: relative;
  display: block;
  overflow-x: hidden;
  color: var(--paper);
  background:
    radial-gradient(120% 58% at 88% 0%, rgba(56, 242, 214, .12), transparent 60%),
    radial-gradient(92% 52% at 0% 44%, rgba(107, 31, 42, .34), transparent 62%),
    radial-gradient(84% 46% at 100% 84%, rgba(42, 42, 107, .26), transparent 60%),
    var(--ink);
  padding-bottom: 5rem;
}

.page-about .about-shell {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.5rem clamp(1.05rem, 4vw, 2.5rem) 0;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: 1.6rem;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
}

.page-about .about-hero__frame {
  position: relative;
  display: grid;
  gap: 1.75rem;
  padding: clamp(1.25rem, 4vw, 2.75rem);
  border: var(--ab-line);
  border-radius: var(--radius-a);
  background:
    radial-gradient(circle at 92% 8%, rgba(56, 242, 214, .18), transparent 44%),
    linear-gradient(155deg, rgba(11, 58, 63, .92) 0%, rgba(14, 43, 36, .9) 46%, rgba(17, 22, 19, .96) 100%);
  overflow: hidden;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-data);
  font-size: .72rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 1.15rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2rem, 7.4vw, 4.3rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 0 0 1.7rem;
  max-width: 46ch;
  font-size: 1.01rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-hero__metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(199, 207, 206, .18);
  border: var(--ab-line);
  border-radius: var(--radius-b);
  overflow: hidden;
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: 1rem .95rem;
  background: rgba(17, 22, 19, .88);
}

.page-about .about-metric__value {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 5.6vw, 2rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-metric--orange .about-metric__value {
  color: var(--orange);
}

.page-about .about-metric__label {
  font-size: .76rem;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .about-hero__media {
  margin: 1.5rem 0 0;
  border: var(--ab-line);
  border-radius: var(--radius-a);
  overflow: hidden;
  background: rgba(11, 58, 63, .5);
}

/* ---------- 通用媒体 ---------- */
.page-about .media {
  margin: 0;
}

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

.page-about .media__caption {
  padding: .7rem 1.05rem .85rem;
  font-size: .76rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 2.5rem;
  padding-top: 1.35rem;
  border-top: var(--ab-line);
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  padding: .45rem .85rem;
  border: var(--ab-line);
  border-radius: 999px;
  font-family: var(--font-data);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  position: relative;
  margin-top: 3.25rem;
  padding-top: 3.25rem;
  border-top: var(--ab-line);
  scroll-margin-top: 6rem;
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 1rem;
  align-items: start;
  margin-bottom: 1.25rem;
}

.page-about .about-head__index {
  min-width: 2.4rem;
  padding-top: .3rem;
  font-family: var(--font-data);
  font-size: .95rem;
  font-weight: 500;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-head__index::after {
  content: "";
  display: block;
  height: 1px;
  margin-top: .55rem;
  background: linear-gradient(90deg, var(--orange), rgba(255, 138, 61, 0));
}

.page-about .about-head__kicker {
  margin: 0 0 .5rem;
  font-family: var(--font-data);
  font-size: .72rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-head .section__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.45rem, 5vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .section__lead {
  margin: 0 0 2rem;
  max-width: 62ch;
  font-size: .97rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 按钮（页面作用域内收口） ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .78rem 1.35rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: .02em;
  text-decoration: none;
  transition: transform .18s var(--ease), background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .btn--primary {
  background: var(--cyan);
  color: var(--ink);
}

.page-about .btn--signal {
  background: var(--orange);
  color: var(--ink);
}

.page-about .btn--ghost {
  background: transparent;
  border-color: rgba(199, 207, 206, .45);
  color: var(--paper);
}

.page-about .btn:hover,
.page-about .btn:focus-visible {
  transform: translateY(-2px);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 标签 ---------- */
.page-about .tag {
  display: inline-flex;
  align-items: center;
  padding: .2rem .55rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-family: var(--font-data);
  font-size: .68rem;
  letter-spacing: .08em;
  white-space: nowrap;
}

.page-about .tag--lime { color: var(--lime); }
.page-about .tag--orange { color: var(--orange); }
.page-about .tag--wine { color: #C9808C; }

/* ---------- 团队构成 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(199, 207, 206, .16);
  border: var(--ab-line);
  border-radius: var(--radius-a);
  overflow: hidden;
}

.page-about .about-role {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: 1.4rem 1.15rem 1.6rem;
  background: var(--ab-panel);
}

.page-about .about-role__num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 1.8rem;
  font-weight: 500;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-role:nth-child(2) .about-role__num { color: var(--orange); }
.page-about .about-role:nth-child(3) .about-role__num { color: var(--lime); }
.page-about .about-role:nth-child(4) .about-role__num { color: var(--silver); }

.page-about .about-role__name {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-role p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 选题原则 ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 0 0 2.25rem;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(199, 207, 206, .16);
  border: var(--ab-line);
  border-radius: var(--radius-b);
  overflow: hidden;
}

.page-about .about-principle {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: 1rem 1.1rem 1.1rem;
  background: rgba(11, 58, 63, .72);
}

.page-about .about-principle__name {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-principle__desc {
  font-size: .85rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  gap: 2rem;
}

.page-about .about-beats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.05rem;
}

.page-about .about-beat {
  padding: 1rem 1.1rem 1.15rem;
  border: var(--ab-line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-b);
  background: rgba(17, 22, 19, .7);
}

.page-about .about-beat:nth-child(2) { border-left-color: var(--orange); }
.page-about .about-beat:nth-child(3) { border-left-color: var(--wine); }
.page-about .about-beat:nth-child(4) { border-left-color: var(--lime); }

.page-about .about-beat__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem;
  margin-bottom: .55rem;
}

.page-about .about-beat__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.04rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-beat__text {
  margin: 0;
  font-size: .88rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-rhythm__media {
  margin: 0;
  border: var(--ab-line);
  border-radius: var(--radius-a);
  overflow: hidden;
  background: rgba(11, 58, 63, .55);
}

/* ---------- 数据能力 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 1.6rem;
  background: rgba(199, 207, 206, .16);
  border: var(--ab-line);
  border-radius: var(--radius-a);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1.1rem 1rem 1.2rem;
  background: rgba(17, 22, 19, .82);
}

.page-about .about-stat__value {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.32rem, 4.6vw, 1.8rem);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .about-stat:nth-child(3n + 2) .about-stat__value { color: var(--lime); }
.page-about .about-stat:nth-child(3n + 3) .about-stat__value { color: var(--orange); }

.page-about .about-stat__label {
  font-size: .76rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-note {
  margin: 0;
  max-width: 68ch;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .22em;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--orange);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0 0 2.25rem;
  padding: 0 0 0 2.1rem;
  display: grid;
  gap: 2.25rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: .45rem;
  bottom: .45rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--orange) 52%, rgba(199, 207, 206, .18) 100%);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-2.1rem - 4px);
  top: .45rem;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink);
}

.page-about .about-timeline__item:nth-child(2)::before { border-color: var(--orange); }
.page-about .about-timeline__item:nth-child(3)::before { border-color: var(--lime); }
.page-about .about-timeline__item:nth-child(4)::before { border-color: var(--silver); }

.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: .4rem;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 1.08rem;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .about-timeline__item:nth-child(2) .about-timeline__year { color: var(--orange); }
.page-about .about-timeline__item:nth-child(3) .about-timeline__year { color: var(--lime); }
.page-about .about-timeline__item:nth-child(4) .about-timeline__year { color: var(--silver); }

.page-about .about-timeline__body h3 {
  margin: 0 0 .35rem;
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 56ch;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-timeline__media {
  margin: 0;
  border: var(--ab-line);
  border-radius: var(--radius-a);
  overflow: hidden;
  background: rgba(14, 43, 36, .6);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.page-about .about-partner {
  padding: 1.25rem 1.2rem 1.35rem;
  border: var(--ab-line);
  border-top: 3px solid var(--cyan);
  border-radius: var(--radius-a);
  background: rgba(17, 22, 19, .72);
}

.page-about .about-partner--orange { border-top-color: var(--orange); }
.page-about .about-partner--wine { border-top-color: var(--wine); }

.page-about .about-partner h3 {
  margin: 0 0 .45rem;
  font-family: var(--font-head);
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-partner p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-honours {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}

.page-about .about-honour {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .35rem .9rem;
  padding: .9rem 1.1rem;
  border: var(--ab-line);
  border-radius: var(--radius-b);
  background: linear-gradient(100deg, rgba(42, 42, 107, .5), rgba(17, 22, 19, .78));
}

.page-about .about-honour__year {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: .82rem;
  letter-spacing: .1em;
  color: var(--lime);
}

.page-about .about-honour__text {
  font-size: .91rem;
  line-height: 1.6;
  color: var(--paper);
}

/* ---------- 合作联系 ---------- */
.page-about .about-section--join {
  border-top-color: rgba(255, 138, 61, .55);
}

.page-about .about-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 2rem;
}

.page-about .about-contact {
  display: grid;
  gap: 1px;
  margin: 0;
  background: rgba(199, 207, 206, .16);
  border: var(--ab-line);
  border-radius: var(--radius-a);
  overflow: hidden;
}

.page-about .about-contact__item {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .95rem 1.1rem 1.05rem;
  background: rgba(17, 22, 19, .82);
}

.page-about .about-contact__item dt {
  font-family: var(--font-data);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-contact__item dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: .86rem;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__frame {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .85fr);
    gap: 2rem;
    align-items: center;
  }

  .page-about .about-hero__metrics {
    grid-template-columns: 1fr;
  }

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

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

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

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

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

@media (min-width: 960px) {
  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
    gap: 2.5rem;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: 1.25rem;
    align-items: start;
  }

  .page-about .about-timeline__year {
    margin-bottom: 0;
    padding-top: .1rem;
  }
}

@media (min-width: 1080px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-section {
    margin-top: 4.25rem;
    padding-top: 4.25rem;
  }
}