.page-about {
  --about-line: var(--c-rule);
  --about-gap: clamp(28px, 4.5vw, 56px);
}

/* ============ 首屏框景 ============ */
.page-about .about-hero {
  padding-top: clamp(6px, 1.8vw, 20px);
}

.page-about .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-size: 0.82rem;
  color: var(--text-low);
  letter-spacing: 0.02em;
}

.page-about .crumbs a {
  color: var(--text-mid);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--c-orange-lift);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(28px, 5vw, 64px) clamp(22px, 4.5vw, 60px) clamp(34px, 5vw, 66px);
  border: 1px solid var(--c-rule);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(255, 138, 61, 0.09), transparent 58%),
    radial-gradient(110% 100% at 100% 100%, rgba(62, 214, 166, 0.07), transparent 60%),
    var(--c-ink);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background: repeating-linear-gradient(90deg, var(--c-orange) 0 2px, transparent 2px 16px);
  opacity: 0.42;
  pointer-events: none;
}

.page-about .about-hero__note {
  position: absolute;
  top: clamp(16px, 3vw, 30px);
  right: clamp(10px, 2vw, 22px);
  writing-mode: vertical-rl;
  letter-spacing: 0.34em;
  font-size: 0.68rem;
  color: var(--c-stone);
  pointer-events: none;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.6vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text-hi);
}

.page-about .about-hero__lead {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 34rem;
  font-size: clamp(0.98rem, 1.6vw, 1.1rem);
  line-height: 1.85;
  color: var(--text-mid);
}

.page-about .about-hero__marks {
  list-style: none;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-rule);
  border: 1px solid var(--c-rule);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__marks li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--c-night);
}

.page-about .about-hero__mark-num {
  font-family: var(--font-num);
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--c-orange);
}

.page-about .about-hero__mark-label {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-mid);
}

/* ============ 起点章节 ============ */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .about-origin__intro .prose {
  margin-top: clamp(18px, 2.5vw, 26px);
}

.page-about .about-origin__aside {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-origin__aside .panel__title {
  margin: 0 0 10px;
}

.page-about .about-origin__aside .panel__text {
  margin: 0;
}

.page-about .about-origin__aside .panel__index {
  display: block;
  margin-bottom: 10px;
}

/* ============ 改版脉络 ============ */
.page-about .about-revisions__media {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-timeline {
  position: relative;
  margin-top: clamp(30px, 4.5vw, 52px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 33px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--c-orange), rgba(255, 138, 61, 0.06));
  opacity: 0.4;
  pointer-events: none;
}

.page-about .about-timeline .expand__item {
  position: relative;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-timeline .expand__trigger {
  width: 100%;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 26px;
  align-items: center;
  gap: 12px;
  padding: 17px 6px 17px 10px;
  background: transparent;
  border: 0;
  color: var(--text-hi);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-timeline .expand__trigger:hover {
  background: rgba(255, 138, 61, 0.06);
}

.page-about .about-timeline .expand__trigger:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: -2px;
}

.page-about .about-timeline__num {
  font-family: var(--font-num);
  font-size: 0.84rem;
  letter-spacing: 0.1em;
  color: var(--c-orange);
}

.page-about .about-timeline__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(0.98rem, 1.9vw, 1.14rem);
  letter-spacing: -0.01em;
  line-height: 1.5;
}

.page-about .about-timeline .expand__panel {
  padding: 0 10px 22px 66px;
}

.page-about .about-timeline__body {
  margin: 0;
  max-width: 36rem;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--text-mid);
}

.page-about .about-timeline .link-more {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.88rem;
}

/* ============ 青训观察 ============ */
.page-about .about-youth .section__title {
  color: var(--c-ink);
}

.page-about .about-youth .eyebrow {
  color: #14795c;
}

.page-about .about-youth .section__lead {
  color: var(--c-stone);
}

.page-about .about-youth__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-top: clamp(26px, 4vw, 44px);
  align-items: start;
}

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

.page-about .about-youth__stats {
  list-style: none;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(14, 42, 36, 0.16);
  border: 1px solid rgba(14, 42, 36, 0.16);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-youth__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--c-paper);
}

.page-about .about-youth__stats .stat__value {
  font-family: var(--font-num);
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  line-height: 1.1;
  color: #14795c;
}

.page-about .about-youth__stats .stat__label {
  font-size: 0.82rem;
  line-height: 1.5;
  color: rgba(14, 42, 36, 0.7);
}

/* ============ 团队与覆盖 ============ */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .about-team__intro .prose {
  margin-top: clamp(18px, 2.5vw, 26px);
}

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

.page-about .about-team__board {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-rule);
  border: 1px solid var(--c-rule);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-team__board li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  background: var(--c-ink);
  transition: background-color 0.18s var(--ease);
}

.page-about .about-team__board li:hover {
  background: #10322B;
}

.page-about .about-team__num {
  font-family: var(--font-num);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  line-height: 1.05;
  color: var(--c-turf);
}

.page-about .about-team__label {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--text-mid);
}

/* ============ 长期内容线 ============ */
.page-about .about-long .section__title {
  color: var(--c-ink);
}

.page-about .about-long .eyebrow {
  color: #14795c;
}

.page-about .about-long .section__lead {
  color: var(--c-stone);
}

.page-about .about-long__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-long__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid rgba(14, 42, 36, 0.18);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.66);
  box-shadow: 0 16px 34px -32px rgba(7, 23, 20, 0.9);
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-long__card:hover {
  border-color: rgba(180, 116, 79, 0.6);
  transform: translateY(-2px);
}

.page-about .about-long__card .tag {
  align-self: flex-start;
}

.page-about .about-long__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2.1vw, 1.22rem);
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .about-long__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.82;
  color: rgba(14, 42, 36, 0.74);
}

/* ============ 收尾导航 ============ */
.page-about .about-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 40px);
  align-items: center;
}

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

.page-about .about-next__lead {
  margin: 16px 0 0;
  max-width: 32rem;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-mid);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next__links .btn {
  flex: 1 1 auto;
  min-width: 148px;
  text-align: center;
  justify-content: center;
}

/* ============ 图片容器 ============ */
.page-about .media-frame {
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-youth .media-frame {
  border-color: rgba(14, 42, 36, 0.18);
}

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

.page-about .media-frame__caption {
  padding: 12px 16px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text-low);
  border-top: 1px solid var(--about-line);
  background: rgba(7, 23, 20, 0.35);
}

.page-about .about-youth .media-frame__caption {
  color: rgba(14, 42, 36, 0.62);
  border-top-color: rgba(14, 42, 36, 0.14);
  background: rgba(255, 255, 255, 0.6);
}

/* ============ 响应式 ============ */
@media (min-width: 620px) {
  .page-about .about-hero__marks {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-youth__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-team__board {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  }

  .page-about .about-next__links {
    justify-content: flex-end;
  }

  .page-about .about-next__links .btn {
    flex: 0 0 auto;
  }

  .page-about .about-timeline .expand__trigger {
    grid-template-columns: 58px minmax(0, 1fr) 26px;
    gap: 18px;
    padding-left: 14px;
  }

  .page-about .about-timeline::before {
    left: 43px;
  }

  .page-about .about-timeline .expand__panel {
    padding-left: 90px;
  }
}

@media (max-width: 520px) {
  .page-about .about-hero__note {
    display: none;
  }

  .page-about .about-timeline .expand__trigger {
    grid-template-columns: 34px minmax(0, 1fr) 22px;
    gap: 10px;
    padding-left: 4px;
  }

  .page-about .about-timeline::before {
    left: 20px;
  }

  .page-about .about-timeline .expand__panel {
    padding-left: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-long__card,
  .page-about .about-timeline .expand__trigger,
  .page-about .about-team__board li,
  .page-about .crumbs a {
    transition: none;
  }

  .page-about .about-long__card:hover {
    transform: none;
  }
}
<<<END>>>