.page-about {
  background: var(--sand);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(44px, 7vw, 88px);
  background:
    radial-gradient(95% 78% at 82% 0%, rgba(46, 107, 63, 0.55) 0%, rgba(15, 26, 20, 0) 64%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--sand);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    102deg,
    rgba(232, 227, 217, 0.05) 0 2px,
    rgba(232, 227, 217, 0) 2px 88px
  );
}

.page-about .about-hero .yt-shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .yt-breadcrumb,
.page-about .about-hero .yt-breadcrumb a {
  color: rgba(232, 227, 217, 0.66);
}

.page-about .about-hero .yt-breadcrumb a:hover {
  color: var(--ref);
}

.page-about .about-hero .yt-breadcrumb [aria-current="page"] {
  color: rgba(232, 227, 217, 0.92);
}

.page-about .about-hero .yt-eyebrow {
  margin-top: clamp(20px, 4vw, 40px);
  color: var(--ref);
}

.page-about .about-hero h1 {
  max-width: 18ch;
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(38px, 8vw, 96px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: rgba(232, 227, 217, 0.82);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(30px, 4.6vw, 52px) 0 0;
  padding: clamp(22px, 3vw, 32px) 0 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 34px);
  border-top: 1px solid rgba(232, 227, 217, 0.2);
}

.page-about .about-hero__facts li {
  display: grid;
  gap: 8px;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.6vw, 50px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ref);
}

.page-about .about-fact__label {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(232, 227, 217, 0.68);
}

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 开篇定位 ---------- */
.page-about .about-intro {
  padding-top: clamp(40px, 6vw, 72px);
}

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

.page-about .about-intro__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--ghost, #d8d3c6);
}

.page-about .about-intro .yt-split {
  align-items: start;
}

.page-about .about-intro__main p {
  margin: 0 0 1.1em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-intro__aside {
  padding: clamp(20px, 3vw, 28px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  gap: 12px;
}

.page-about .about-intro__aside .yt-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-intro__aside .yt-stat:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-intro__aside .yt-stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--grass);
}

.page-about .about-intro__aside .yt-stat__label {
  font-size: 14px;
  color: var(--text-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .about-timeline .yt-eyebrow {
  color: var(--stone);
}

.page-about .about-axis {
  position: relative;
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0 0 0 40px;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--line);
}

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

.page-about .about-axis__item::before {
  content: "";
  position: absolute;
  left: -40px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--sand);
  border: 2px solid var(--stone);
  box-sizing: border-box;
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-axis__item.is-active::before {
  background: var(--moss);
  border-color: var(--grass);
  transform: scale(1.1);
}

.page-about .about-axis__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--grass);
}

.page-about .about-axis__item.is-active .about-axis__year {
  color: var(--red);
}

.page-about .about-axis__body h3 {
  margin: 10px 0 8px;
}

.page-about .about-axis__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

@media (min-width: 900px) {
  .page-about .about-axis {
    padding-left: 56px;
  }
  .page-about .about-axis::before {
    left: 8px;
  }
  .page-about .about-axis__item::before {
    left: -56px;
    top: 10px;
    width: 17px;
    height: 17px;
  }
  .page-about .about-axis__item {
    display: grid;
    grid-template-columns: minmax(84px, 128px) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: start;
  }
  .page-about .about-axis__year {
    padding-top: 2px;
  }
  .page-about .about-axis__body h3 {
    margin-top: 0;
  }
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-flow .yt-eyebrow {
  color: var(--ref);
}

.page-about .about-flow__lead {
  max-width: 62ch;
  margin: 16px 0 clamp(30px, 4vw, 48px);
  color: rgba(232, 227, 217, 0.78);
}

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

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(16px, 3vw, 34px);
  align-items: start;
  padding: clamp(20px, 2.8vw, 30px) 0;
  border-top: 1px solid rgba(232, 227, 217, 0.16);
}

.page-about .about-step:last-child {
  border-bottom: 1px solid rgba(232, 227, 217, 0.16);
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--ref);
}

.page-about .about-step__body h3 {
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .about-step__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(232, 227, 217, 0.76);
}

@media (min-width: 1000px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(32px, 5vw, 72px);
  }
  .page-about .about-step:nth-child(5) {
    grid-column: 1 / -1;
    max-width: 62ch;
  }
}

.page-about .about-flow__fig {
  margin: clamp(32px, 5vw, 56px) 0 0;
}

.page-about .about-flow__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  background: rgba(232, 227, 217, 0.12);
}

.page-about .about-flow__fig .yt-media__cap {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(232, 227, 217, 0.58);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-team__lead {
  max-width: 66ch;
  margin: 16px 0 clamp(26px, 4vw, 40px);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-roles {
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  border: 1px solid var(--line);
  border-left: 4px solid var(--moss);
  border-radius: var(--radius);
  background: var(--paper);
  transition: border-left-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-role[open] {
  border-left-color: var(--grass);
}

.page-about .about-role__sum {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: clamp(16px, 2.2vw, 22px) clamp(18px, 2.6vw, 28px);
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius);
}

.page-about .about-role__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-role__sum:focus-visible {
  outline: 2px solid var(--grass);
  outline-offset: -2px;
}

.page-about .about-role__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-role__count {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  color: var(--grass);
}

.page-about .about-role__body {
  padding: clamp(14px, 2vw, 20px) clamp(18px, 2.6vw, 28px) clamp(20px, 2.6vw, 26px);
  border-top: 1px solid var(--line);
}

.page-about .about-role__body p {
  margin: 0;
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 青训 ---------- */
.page-about .about-youth {
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(40px, 6vw, 72px);
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-youth__lead {
  max-width: 66ch;
  margin: 16px 0 clamp(26px, 4vw, 40px);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-youth__panels {
  margin-top: 18px;
}

.page-about .about-youth-panel {
  display: none;
  padding: clamp(20px, 2.8vw, 30px);
  background: var(--sand);
  border: 1px solid var(--line);
  border-left: 4px solid var(--wood);
  border-radius: var(--radius);
}

.page-about .about-youth-panel[data-active] {
  display: block;
}

.page-about .about-youth-panel h3 {
  margin: 0 0 10px;
}

.page-about .about-youth-panel p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-youth__body {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

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

.page-about .about-reclist li {
  display: grid;
  gap: 6px;
  padding: clamp(14px, 2vw, 20px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-reclist__key {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--grass);
}

.page-about .about-reclist__val {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

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

.page-about .about-youth__fig img {
  display: block;
  width: 100%;
  max-width: 520px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--ghost, #d8d3c6);
}

.page-about .about-youth__fig .yt-media__cap {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

@media (min-width: 860px) {
  .page-about .about-youth__body {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-partners__lead {
  max-width: 66ch;
  margin: 16px 0 clamp(26px, 4vw, 40px);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-partner-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-partner {
  padding: clamp(20px, 2.8vw, 30px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-partner--alt {
  background: var(--ink);
  border-color: var(--ink);
}

.page-about .about-partner--alt .yt-h3 {
  color: var(--paper);
}

.page-about .about-partner--alt p {
  color: rgba(232, 227, 217, 0.74);
}

.page-about .about-partner__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(36px, 5.4vw, 60px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--grass);
}

.page-about .about-partner--alt .about-partner__num {
  color: var(--ref);
}

.page-about .about-partner__unit {
  font-size: 0.55em;
  margin-left: 0.1em;
}

.page-about .about-partner h3 {
  margin: 0;
}

.page-about .about-partner p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

@media (min-width: 820px) {
  .page-about .about-partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-honor {
  margin-top: clamp(30px, 4.4vw, 48px);
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line);
}

.page-about .about-honor h3 {
  margin: 0 0 14px;
}

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

.page-about .about-honor__list li {
  display: grid;
  gap: 6px;
  padding-left: 16px;
  border-left: 3px solid var(--ref);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-honor__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--grass);
}

@media (min-width: 720px) {
  .page-about .about-honor__list li {
    grid-template-columns: minmax(120px, 160px) minmax(0, 1fr);
    gap: clamp(16px, 2.4vw, 28px);
    align-items: baseline;
  }
}

/* ---------- 尾段索引 ---------- */
.page-about .about-next {
  padding: clamp(48px, 7vw, 96px) 0 clamp(56px, 8vw, 104px);
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--sand);
}

.page-about .about-next .yt-h2 {
  color: var(--paper);
}

.page-about .about-next__links {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(232, 227, 217, 0.18);
}

.page-about .about-next__links a {
  display: grid;
  gap: 6px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid rgba(232, 227, 217, 0.18);
  text-decoration: none;
  color: inherit;
  transition: padding-left 0.24s var(--ease), color 0.24s var(--ease);
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  padding-left: clamp(8px, 1.4vw, 16px);
}

.page-about .about-next__links a:focus-visible {
  outline: 2px solid var(--ref);
  outline-offset: 4px;
}

.page-about .about-next__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 32px);
  letter-spacing: -0.01em;
  color: var(--ref);
}

.page-about .about-next__desc {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(232, 227, 217, 0.72);
}

@media (min-width: 900px) {
  .page-about .about-next__links a {
    grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: baseline;
  }
  .page-about .about-next__desc {
    font-size: 16px;
  }
}

.page-about .about-next__actions {
  margin-top: clamp(28px, 4vw, 44px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next .yt-btn {
  border: 1px solid var(--grass);
  background: var(--grass);
  color: var(--paper);
}

.page-about .about-next .yt-btn--ghost {
  background: transparent;
  border-color: rgba(232, 227, 217, 0.4);
  color: var(--sand);
}

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

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-axis__item::before,
  .page-about .about-role,
  .page-about .about-next__links a {
    transition: none;
  }
  .page-about .about-axis__item.is-active::before {
    transform: none;
  }
}
</main>

/* 说明：以上 PAGE_CSS 标记内为页面专属样式，全部限定在 .page-about 作用域内 */
.page-about {
  background: var(--sand);
  color: var(--text);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(44px, 7vw, 88px);
  background:
    radial-gradient(95% 78% at 82% 0%, rgba(46, 107, 63, 0.55) 0%, rgba(15, 26, 20, 0) 64%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--sand);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    102deg,
    rgba(232, 227, 217, 0.05) 0 2px,
    rgba(232, 227, 217, 0) 2px 88px
  );
}
.page-about .about-hero .yt-shell { position: relative; z-index: 1; }
.page-about .about-hero .yt-breadcrumb,
.page-about .about-hero .yt-breadcrumb a { color: rgba(232, 227, 217, 0.66); }
.page-about .about-hero .yt-breadcrumb a:hover { color: var(--ref); }
.page-about .about-hero .yt-breadcrumb [aria-current="page"] { color: rgba(232, 227, 217, 0.92); }
.page-about .about-hero .yt-eyebrow { margin-top: clamp(20px, 4vw, 40px); color: var(--ref); }
.page-about .about-hero h1 {
  max-width: 18ch;
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(38px, 8vw, 96px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-about .about-hero__lead {
  max-width: 62ch;
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: rgba(232, 227, 217, 0.82);
}
.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(30px, 4.6vw, 52px) 0 0;
  padding: clamp(22px, 3vw, 32px) 0 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 34px);
  border-top: 1px solid rgba(232, 227, 217, 0.2);
}
.page-about .about-hero__facts li { display: grid; gap: 8px; }
.page-about .about-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.6vw, 50px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ref);
}
.page-about .about-fact__label { font-size: 14px; line-height: 1.6; color: rgba(232, 227, 217, 0.68); }
@media (min-width: 640px) {
  .page-about .about-hero__facts { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* 开篇定位 */
.page-about .about-intro { padding-top: clamp(40px, 6vw, 72px); }
.page-about .about-intro__fig { margin: 0 0 clamp(30px, 5vw, 56px); }
.page-about .about-intro__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--ghost, #d8d3c6);
}
.page-about .about-intro .yt-split { align-items: start; }
.page-about .about-intro__main p {
  margin: 0 0 1.1em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-soft);
}
.page-about .about-intro__aside {
  padding: clamp(20px, 3vw, 28px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  gap: 12px;
}
.page-about .about-intro__aside .yt-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-intro__aside .yt-stat:last-of-type { border-bottom: 0; padding-bottom: 0; }
.page-about .about-intro__aside .yt-stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--grass);
}
.page-about .about-intro__aside .yt-stat__label { font-size: 14px; color: var(--text-soft); }

/* 时间轴 */
.page-about .about-timeline { padding-bottom: clamp(40px, 6vw, 72px); }
.page-about .about-timeline .yt-eyebrow { color: var(--stone); }
.page-about .about-axis {
  position: relative;
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0 0 0 40px;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}
.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--line);
}
.page-about .about-axis__item { position: relative; }
.page-about .about-axis__item::before {
  content: "";
  position: absolute;
  left: -40px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--sand);
  border: 2px solid var(--stone);
  box-sizing: border-box;
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease), transform 0.24s var(--ease);
}
.page-about .about-axis__item.is-active::before {
  background: var(--moss);
  border-color: var(--grass);
  transform: scale(1.1);
}
.page-about .about-axis__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--grass);
}
.page-about .about-axis__item.is-active .about-axis__year { color: var(--red); }
.page-about .about-axis__body h3 { margin: 10px 0 8px; }
.page-about .about-axis__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}
@media (min-width: 900px) {
  .page-about .about-axis { padding-left: 56px; }
  .page-about .about-axis::before { left: 8px; }
  .page-about .about-axis__item::before { left: -56px; top: 10px; width: 17px; height: 17px; }
  .page-about .about-axis__item {
    display: grid;
    grid-template-columns: minmax(84px, 128px) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: start;
  }
  .page-about .about-axis__year { padding-top: 2px; }
  .page-about .about-axis__body h3 { margin-top: 0; }
}

/* 流程 */
.page-about .about-flow { padding: clamp(48px, 7vw, 96px) 0; }
.page-about .about-flow .yt-eyebrow { color: var(--ref); }
.page-about .about-flow__lead {
  max-width: 62ch;
  margin: 16px 0 clamp(30px, 4vw, 48px);
  color: rgba(232, 227, 217, 0.78);
}
.page-about .about-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(16px, 3vw, 34px);
  align-items: start;
  padding: clamp(20px, 2.8vw, 30px) 0;
  border-top: 1px solid rgba(232, 227, 217, 0.16);
}
.page-about .about-step:last-child { border-bottom: 1px solid rgba(232, 227, 217, 0.16); }
.page-about .about-step__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--ref);
}
.page-about .about-step__body h3 { margin: 0 0 8px; color: var(--paper); }
.page-about .about-step__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(232, 227, 217, 0.76);
}
@media (min-width: 1000px) {
  .page-about .about-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: clamp(32px, 5vw, 72px); }
  .page-about .about-step:nth-child(5) { grid-column: 1 / -1; max-width: 62ch; }
}
.page-about .about-flow__fig { margin: clamp(32px, 5vw, 56px) 0 0; }
.page-about .about-flow__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  background: rgba(232, 227, 217, 0.12);
}
.page-about .about-flow__fig .yt-media__cap {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(232, 227, 217, 0.58);
}

/* 团队 */
.page-about .about-team { padding-bottom: clamp(48px, 7vw, 88px); }
.page-about .about-team__lead {
  max-width: 66ch;
  margin: 16px 0 clamp(26px, 4vw, 40px);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-soft);
}
.page-about .about-roles { display: grid; gap: 12px; }
.page-about .about-role {
  border: 1px solid var(--line);
  border-left: 4px solid var(--moss);
  border-radius: var(--radius);
  background: var(--paper);
  transition: border-left-color 0.22s var(--ease), background 0.22s var(--ease);
}
.page-about .about-role[open] { border-left-color: var(--grass); }
.page-about .about-role__sum {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: clamp(16px, 2.2vw, 22px) clamp(18px, 2.6vw, 28px);
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius);
}
.page-about .about-role__sum::-webkit-details-marker { display: none; }
.page-about .about-role__sum:focus-visible { outline: 2px solid var(--grass); outline-offset: -2px; }
.page-about .about-role__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: -0.01em;
  color: var(--ink);
}
.page-about .about-role__count {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  color: var(--grass);
}
.page-about .about-role__body {
  padding: clamp(14px, 2vw, 20px) clamp(18px, 2.6vw, 28px) clamp(20px, 2.6vw, 26px);
  border-top: 1px solid var(--line);
}
.page-about .about-role__body p {
  margin: 0;
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

/* 青训 */
.page-about .about-youth {
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(40px, 6vw, 72px);
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-youth__lead {
  max-width: 66ch;
  margin: 16px 0 clamp(26px, 4vw, 40px);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-soft);
}
.page-about .about-youth__panels { margin-top: 18px; }
.page-about .about-youth-panel {
  display: none;
  padding: clamp(20px, 2.8vw, 30px);
  background: var(--sand);
  border: 1px solid var(--line);
  border-left: 4px solid var(--wood);
  border-radius: var(--radius);
}
.page-about .about-youth-panel[data-active] { display: block; }
.page-about .about-youth-panel h3 { margin: 0 0 10px; }
.page-about .about-youth-panel p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}
.page-about .about-youth__body {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}
.page-about .about-reclist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.page-about .about-reclist li {
  display: grid;
  gap: 6px;
  padding: clamp(14px, 2vw, 20px) 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-reclist__key {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--grass);
}
.page-about .about-reclist__val { font-size: 16px; line-height: 1.8; color: var(--text-soft); }
.page-about .about-youth__fig { margin: 0; }
.page-about .about-youth__fig img {
  display: block;
  width: 100%;
  max-width: 520px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--ghost, #d8d3c6);
}
.page-about .about-youth__fig .yt-media__cap {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}
@media (min-width: 860px) {
  .page-about .about-youth__body {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* 合作与认可 */
.page-about .about-partners { padding-bottom: clamp(48px, 7vw, 88px); }
.page-about .about-partners__lead {
  max-width: 66ch;
  margin: 16px 0 clamp(26px, 4vw, 40px);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-soft);
}
.page-about .about-partner-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}
.page-about .about-partner {
  padding: clamp(20px, 2.8vw, 30px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  gap: 10px;
  align-content: start;
}
.page-about .about-partner--alt { background: var(--ink); border-color: var(--ink); }
.page-about .about-partner--alt .yt-h3 { color: var(--paper); }
.page-about .about-partner--alt p { color: rgba(232, 227, 217, 0.74); }
.page-about .about-partner__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(36px, 5.4vw, 60px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--grass);
}
.page-about .about-partner--alt .about-partner__num { color: var(--ref); }
.page-about .about-partner__unit { font-size: 0.55em; margin-left: 0.1em; }
.page-about .about-partner h3 { margin: 0; }
.page-about .about-partner p { margin: 0; font-size: 16px; line-height: 1.8; color: var(--text-soft); }
@media (min-width: 820px) {
  .page-about .about-partner-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-about .about-honor {
  margin-top: clamp(30px, 4.4vw, 48px);
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line);
}
.page-about .about-honor h3 { margin: 0 0 14px; }
.page-about .about-honor__list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.page-about .about-honor__list li {
  display: grid;
  gap: 6px;
  padding-left: 16px;
  border-left: 3px solid var(--ref);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}
.page-about .about-honor__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--grass);
}
@media (min-width: 720px) {
  .page-about .about-honor__list li {
    grid-template-columns: minmax(120px, 160px) minmax(0, 1fr);
    gap: clamp(16px, 2.4vw, 28px);
    align-items: baseline;
  }
}

/* 尾段索引 */
.page-about .about-next {
  padding: clamp(48px, 7vw, 96px) 0 clamp(56px, 8vw, 104px);
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--sand);
}
.page-about .about-next .yt-h2 { color: var(--paper); }
.page-about .about-next__links {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(232, 227, 217, 0.18);
}
.page-about .about-next__links a {
  display: grid;
  gap: 6px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid rgba(232, 227, 217, 0.18);
  text-decoration: none;
  color: inherit;
  transition: padding-left 0.24s var(--ease), color 0.24s var(--ease);
}
.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible { padding-left: clamp(8px, 1.4vw, 16px); }
.page-about .about-next__links a:focus-visible { outline: 2px solid var(--ref); outline-offset: 4px; }
.page-about .about-next__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 32px);
  letter-spacing: -0.01em;
  color: var(--ref);
}
.page-about .about-next__desc { font-size: 15px; line-height: 1.75; color: rgba(232, 227, 217, 0.72); }
@media (min-width: 900px) {
  .page-about .about-next__links a {
    grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: baseline;
  }
  .page-about .about-next__desc { font-size: 16px; }
}
.page-about .about-next__actions {
  margin-top: clamp(28px, 4vw, 44px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-next .yt-btn { border: 1px solid var(--grass); background: var(--grass); color: var(--paper); }
.page-about .about-next .yt-btn--ghost {
  background: transparent;
  border-color: rgba(232, 227, 217, 0.4);
  color: var(--sand);
}
.page-about .about-next .yt-btn--ghost:hover,
.page-about .about-next .yt-btn--ghost:focus-visible { border-color: var(--ref); color: var(--ref); }

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-axis__item::before,
  .page-about .about-role,
  .page-about .about-next__links a { transition: none; }
  .page-about .about-axis__item.is-active::before { transform: none; }
}