.page-about {
  --about-paper-amber: #C2731A;
  --about-paper-line: rgba(26, 20, 16, 0.14);
  --about-paper-muted: #6B5C4D;
  --about-paper-body: #3A3028;
  background: var(--night);
  color: var(--cream);
  padding-bottom: 72px;
}

.page-about .about-crumb {
  padding: 22px 0 6px;
  font-size: 13px;
}

.page-about .about-crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-crumb .breadcrumb__item {
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .about-crumb .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .about-crumb .breadcrumb__item a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-crumb .breadcrumb__item a:hover {
  color: var(--green);
  border-bottom-color: var(--green);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  display: grid;
  gap: 32px;
  padding: 26px 0 56px;
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(32px, 6.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  color: var(--cream);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: 30px 0 0;
}

.page-about .about-stat {
  border-top: 1px solid var(--line-strong);
  padding-top: 10px;
}

.page-about .about-stat dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-stat dd {
  margin: 8px 0 0;
  font-size: 22px;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-hero__frame {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

/* ---------- 通用章节 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: 22px;
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter__aside {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--mist);
  opacity: 0.5;
  transition: color 0.5s var(--ease), opacity 0.5s var(--ease);
}

.page-about .about-chapter.is-visible .about-num,
.page-about .about-clubs.is-visible .about-num {
  color: var(--amber);
  opacity: 1;
}

.page-about .about-meta {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-chapter__body h2 {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: clamp(24px, 4.2vw, 34px);
  line-height: 1.28;
  color: var(--cream);
}

.page-about .about-chapter__body p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__body a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 220, 151, 0.45);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-chapter__body a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 奶油纸区块 ---------- */
.page-about .about-paper {
  background: var(--cream);
  color: var(--ink);
  border-radius: var(--r-lg);
  padding: 26px 20px;
}

.page-about .about-paper .about-chapter {
  border-top: 1px solid var(--about-paper-line);
}

.page-about .about-paper .about-chapter:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-about .about-paper .about-num {
  color: var(--about-paper-muted);
  opacity: 0.55;
}

.page-about .about-paper .about-chapter.is-visible .about-num,
.page-about .about-paper .about-clubs.is-visible .about-num {
  color: var(--about-paper-amber);
  opacity: 1;
}

.page-about .about-paper .about-meta {
  color: var(--about-paper-muted);
}

.page-about .about-paper .about-chapter__body h2,
.page-about .about-paper .about-clubs__text h2 {
  color: var(--ink);
}

.page-about .about-paper .about-chapter__body p {
  color: var(--about-paper-body);
}

/* ---------- 三层坐标 ---------- */
.page-about .about-layers {
  display: grid;
  gap: 20px;
  margin: 4px 0 18px;
}

.page-about .about-layer {
  border-left: 3px solid var(--about-paper-amber);
  padding: 2px 0 2px 14px;
}

.page-about .about-layer h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-layer p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #4A3F34;
}

/* ---------- 团队四格 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
}

.page-about .about-crew__item {
  background: var(--tier);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 20px 18px;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease),
    transform 0.25s var(--ease);
}

.page-about .about-crew__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
  transition: color 0.25s var(--ease);
}

.page-about .about-crew__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
  transition: color 0.25s var(--ease);
}

.page-about .about-crew__item:hover {
  background: var(--green);
  border-color: var(--green);
  transform: translateY(-2px);
}

.page-about .about-crew__item:hover h3 {
  color: var(--night);
}

.page-about .about-crew__item:hover p {
  color: #10263A;
}

.page-about .about-cadence {
  display: grid;
  gap: 18px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence__item {
  display: flex;
  gap: 16px;
  align-items: baseline;
}

.page-about .about-cadence__num {
  flex: none;
  font-size: 22px;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-about .about-cadence__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 版本轴 ---------- */
.page-about .about-versions {
  display: grid;
  gap: 28px;
  margin: 26px 0 0;
}

.page-about .about-version {
  position: relative;
  padding-top: 24px;
  border-top: 2px solid var(--line-strong);
  transition: border-color 0.25s var(--ease);
}

.page-about .about-version::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--green);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease),
    box-shadow 0.25s var(--ease);
}

.page-about .about-version--key::before {
  background: var(--amber);
}

.page-about .about-version:hover {
  border-top-color: var(--amber);
}

.page-about .about-version:hover::before {
  transform: scale(1.35);
  box-shadow: 0 0 0 6px var(--amber-soft);
}

.page-about .about-version__tag {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--green);
}

.page-about .about-version--key .about-version__tag {
  color: var(--amber);
}

.page-about .about-version h3 {
  margin: 10px 0 8px;
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .about-version p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-version-figure {
  margin-top: 32px;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

/* ---------- 球队档案 ---------- */
.page-about .about-paper--clubs {
  padding: 0;
  overflow: hidden;
}

.page-about .about-clubs {
  display: grid;
}

.page-about .about-clubs__text {
  padding: 30px 22px;
}

.page-about .about-clubs__text h2 {
  margin: 12px 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(23px, 4vw, 32px);
  line-height: 1.3;
}

.page-about .about-clubs__text p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-paper-body);
}

.page-about .about-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.78;
  color: #4A3F34;
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--about-paper-amber);
}

.page-about .about-clubs__media {
  min-height: 200px;
}

.page-about .about-clubs__media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
}

/* ---------- 收束区 ---------- */
.page-about .about-close {
  margin-top: 48px;
  padding: 30px 22px;
  border: 1px solid var(--green);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(61, 220, 151, 0.16), transparent 62%),
    var(--tier);
  box-shadow: var(--shadow-float);
}

.page-about .about-close h2 {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.25;
  color: var(--cream);
}

.page-about .about-close p {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-cadence {
    gap: 20px 32px;
  }

  .page-about .about-paper {
    padding: 40px 40px;
  }
}

@media (min-width: 900px) {
  .page-about {
    padding-bottom: 96px;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 52px;
    align-items: center;
    padding: 36px 0 72px;
  }

  .page-about .about-chapter {
    grid-template-columns: minmax(0, 0.34fr) minmax(0, 1fr);
    gap: 52px;
    padding: 64px 0;
    align-items: start;
  }

  .page-about .about-paper .about-chapter:first-child {
    padding-top: 14px;
  }

  .page-about .about-layers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-clubs {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: stretch;
  }

  .page-about .about-clubs__text {
    padding: 52px 48px;
  }

  .page-about .about-clubs__media,
  .page-about .about-clubs__media img {
    min-height: 100%;
  }

  .page-about .about-close {
    padding: 48px;
    margin-top: 64px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}