.page-about {
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 46%, var(--ink-900) 100%);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏：章节预告带 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 22px 0 54px;
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 72%, var(--moss-900) 100%);
  border-bottom: var(--border-w) solid var(--moss-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -150px;
  width: 460px;
  height: 460px;
  background: radial-gradient(circle, rgba(53, 240, 192, 0.2) 0%, rgba(53, 240, 192, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -6%;
  right: -6%;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--moss-line) 0%, var(--cyan) 52%, var(--amber) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .crumbs {
  margin-bottom: 26px;
}

.page-about .about-eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan-soft);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 14em;
  font-size: clamp(30px, 7.4vw, 54px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 0 0 34px;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .about-jump {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 2px solid var(--moss-line);
}

.page-about .about-jump__item {
  border-bottom: 1px solid var(--moss-line);
}

.page-about .about-jump__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 2px;
  color: var(--paper);
  text-decoration: none;
  transition: color 0.14s var(--ease), padding-left 0.14s var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--cyan);
  padding-left: 8px;
}

.page-about .about-jump__num {
  flex: none;
  font-size: 13px;
  color: var(--amber);
  letter-spacing: 0.05em;
}

.page-about .about-jump__name {
  font-size: 15.5px;
  font-weight: 700;
}

@media (min-width: 820px) {
  .page-about .about-jump {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    border-top: 0;
    padding-top: 0;
  }
  .page-about .about-jump__item {
    border-bottom: 0;
    border-left: 2px solid var(--moss-line);
    padding-left: 14px;
  }
  .page-about .about-jump__link {
    flex-direction: column;
    gap: 4px;
    padding: 4px 0;
  }
  .page-about .about-jump__link:hover,
  .page-about .about-jump__link:focus-visible {
    padding-left: 0;
    box-shadow: inset 0 -2px 0 0 var(--cyan);
  }
}

/* ---------- 时间轴骨架 ---------- */
.page-about .about-timeline {
  position: relative;
  padding: 56px 0 72px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 30px;
  top: 48px;
  bottom: 48px;
  width: 2px;
  background: linear-gradient(180deg, var(--moss-line) 0%, var(--cyan) 46%, var(--amber) 100%);
}

.page-about .about-chapter {
  position: relative;
  margin-bottom: 68px;
  padding-left: 46px;
}

.page-about .about-chapter:last-of-type {
  margin-bottom: 0;
}

.page-about .about-chapter__num {
  position: absolute;
  left: 0;
  top: 2px;
  width: 22px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-chapter__dot {
  position: absolute;
  left: 24px;
  top: 7px;
  box-sizing: border-box;
  width: 12px;
  height: 12px;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
}

.page-about .about-chapter__head {
  margin-bottom: 20px;
}

.page-about .about-chapter__head h2 {
  margin: 0 0 8px;
  font-size: clamp(23px, 5.6vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-chapter__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--cyan-soft);
}

.page-about .about-chapter__body .prose {
  margin: 0 0 20px;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .about-chapter__body .prose:last-of-type {
  margin-bottom: 24px;
}

.page-about .about-inline-num {
  color: var(--amber);
  font-weight: 700;
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 26px 0 0;
  overflow: hidden;
  background: var(--moss-900);
  border: var(--border-w) solid var(--moss-line);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-figure .media__caption {
  position: static;
  margin: 0;
  padding: 12px 15px 14px;
  border-top: 2px solid var(--moss-line);
  background: var(--moss-900);
  font-size: 14px;
  line-height: 1.62;
  color: var(--cyan-soft);
}

/* ---------- 01 发展脉络 ---------- */
.page-about .about-era {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-era__item {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--moss-line);
}

.page-about .about-era__item:last-child {
  border-bottom: 1px solid var(--moss-line);
}

.page-about .about-era__year {
  font-size: 15px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.02em;
  padding-top: 2px;
}

.page-about .about-era__title {
  margin: 0 0 5px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-era__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--cyan-soft);
}

.page-about .about-era__desc a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--moss-line);
}

.page-about .about-era__desc a:hover,
.page-about .about-era__desc a:focus-visible {
  border-bottom-color: var(--amber);
  color: var(--amber);
}

/* ---------- 02 流程卡 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 22px;
  margin-top: 26px;
}

.page-about .about-step {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--moss-900);
  border: var(--border-w) solid var(--moss-line);
  box-shadow: var(--shadow-hard);
  transition: box-shadow 0.14s var(--ease), transform 0.14s var(--ease), border-color 0.14s var(--ease);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  box-shadow: var(--shadow-press);
  transform: translate(4px, 4px);
  border-color: var(--moss-700);
}

.page-about .about-step__idx {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-step__lead {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--paper);
}

.page-about .about-step__points {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step__points li {
  position: relative;
  padding-left: 17px;
  font-size: 15px;
  line-height: 1.66;
  color: var(--cyan-soft);
}

.page-about .about-step__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

.page-about .accordion {
  margin-top: 16px;
}

.page-about .accordion__panel {
  margin-top: 12px;
}

.page-about .accordion__panel[hidden] {
  display: none;
}

@media (min-width: 780px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px;
  }
}

.page-about .about-note {
  margin: 30px 0 0;
  padding: 16px 18px;
  border-left: var(--border-w) solid var(--amber);
  background: var(--ink-800);
  font-size: 15px;
  line-height: 1.72;
  color: var(--cyan-soft);
}

.page-about .about-note a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid var(--amber-deep);
}

.page-about .about-note a:hover,
.page-about .about-note a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 03 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(178px, 1fr));
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-role {
  position: relative;
  padding: 20px 16px 18px;
  background: linear-gradient(158deg, var(--moss-700) 0%, var(--moss-900) 100%);
  border: var(--border-w) solid var(--moss-line);
  box-shadow: var(--shadow-hard);
  transition: box-shadow 0.16s var(--ease), transform 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-role:hover {
  border-color: var(--cyan);
  box-shadow: var(--shadow-press);
  transform: translate(4px, 4px);
}

.page-about .about-role__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-role__name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-role__hint {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--cyan-soft);
  opacity: 0.78;
  transition: opacity 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .about-role:hover .about-role__hint,
.page-about .about-role:focus-within .about-role__hint {
  opacity: 1;
  color: var(--paper);
}

.page-about .about-team-note {
  margin-top: 30px;
}

.page-about .about-team-note__text p {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper);
}

/* ---------- 04 青训梯队 ---------- */
.page-about .about-youth {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

.page-about .about-youth__card {
  position: relative;
  padding: 24px 20px 20px;
  background: var(--moss-900);
  border: var(--border-w) solid var(--moss-line);
}

.page-about .about-youth__card::after {
  content: "";
  position: absolute;
  top: -3px;
  right: -3px;
  width: 0;
  height: 0;
  border-top: 22px solid var(--ink-900);
  border-left: 22px solid transparent;
  pointer-events: none;
}

.page-about .about-youth__title {
  margin: 14px 0 8px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-youth__card p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--paper);
}

.page-about .about-youth__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-youth__list li {
  position: relative;
  padding-left: 15px;
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--cyan-soft);
}

.page-about .about-youth__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 5px;
  height: 5px;
  background: var(--amber);
}

@media (min-width: 780px) {
  .page-about .about-youth {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .about-youth__media {
  margin-top: 30px;
  display: grid;
  gap: 22px;
}

.page-about .about-youth__aside {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--moss-line);
  font-size: 15px;
  line-height: 1.74;
  color: var(--cyan-soft);
}

.page-about .about-youth__aside a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--moss-line);
}

.page-about .about-youth__aside a:hover,
.page-about .about-youth__aside a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 05 原则与协作 ---------- */
.page-about .about-principles-block {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

.page-about .about-principles {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-principles li {
  padding: 2px 0 2px 18px;
  border-left: var(--border-w) solid var(--cyan);
}

.page-about .about-principles h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-principles p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--cyan-soft);
}

.page-about .about-partners {
  padding: 22px 20px;
  background: var(--moss-900);
  border: var(--border-w) solid var(--moss-line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-partners__title {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-partners p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--paper);
}

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

.page-about .about-partners__list li {
  position: relative;
  padding-left: 17px;
  font-size: 15px;
  line-height: 1.68;
  color: var(--cyan-soft);
}

.page-about .about-partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--amber);
}

.page-about .about-recog {
  margin-top: 30px;
  padding: 22px 20px;
  background: linear-gradient(140deg, var(--ink-800) 0%, var(--moss-900) 100%);
  border-left: var(--border-w) solid var(--amber);
}

.page-about .about-recog__text {
  margin: 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .about-recog__text + .about-recog__text {
  margin-top: 14px;
  color: var(--cyan-soft);
}

.page-about .about-recog__text .num {
  color: var(--amber);
  font-weight: 700;
}

.page-about .about-paths {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 桌面端时间轴放大 ---------- */
@media (min-width: 1024px) {
  .page-about .about-timeline {
    padding: 68px 0 88px;
  }

  .page-about .about-timeline::before {
    left: 124px;
  }

  .page-about .about-chapter {
    margin-bottom: 92px;
    padding-left: 164px;
  }

  .page-about .about-chapter__num {
    width: 96px;
    top: -6px;
    font-size: 44px;
    line-height: 1;
    letter-spacing: -0.02em;
  }

  .page-about .about-chapter__dot {
    left: 118px;
    top: 12px;
    width: 14px;
    height: 14px;
  }

  .page-about .about-split {
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-split .about-figure {
    margin-top: 4px;
    position: sticky;
    top: 118px;
  }

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

  .page-about .about-team-note .about-figure {
    margin-top: 0;
  }

  .page-about .about-youth__media {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 36px;
    align-items: center;
  }

  .page-about .about-principles-block {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 44px;
    align-items: start;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 420px) {
  .page-about .about-chapter {
    padding-left: 40px;
  }

  .page-about .about-era__item {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .about-role__num {
    font-size: 34px;
  }

  .page-about .about-paths .btn {
    width: 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-role,
  .page-about .about-jump__link,
  .page-about .about-role__hint {
    transition: none;
  }

  .page-about .about-step:hover,
  .page-about .about-step:focus-within,
  .page-about .about-role:hover {
    transform: none;
  }
}