.page-about {
  --about-max: 860px;
  --about-gap: clamp(40px, 7vw, 84px);
  display: block;
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-block: clamp(14px, 2.4vw, 22px) 0;
}

/* ---------- 居中刊头 ---------- */
.page-about .about-masthead {
  padding-block: clamp(30px, 5vw, 68px) clamp(32px, 5vw, 60px);
  text-align: center;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-masthead__eyebrow {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .38em;
  text-transform: uppercase;
  color: var(--amber-600);
}

.page-about .about-masthead__title {
  margin: 0 auto;
  max-width: 24ch;
  font-size: clamp(1.9rem, 6.2vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-masthead__lead {
  margin: clamp(20px, 3.2vw, 30px) auto 0;
  max-width: 62ch;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-masthead__metrics {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(20px, 5vw, 56px);
  margin: clamp(28px, 4.4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-masthead__metrics li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 84px;
}

.page-about .about-masthead__metrics .u-num {
  font-size: clamp(26px, 4.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber-600);
}

.page-about .about-masthead__metrics em {
  font-style: normal;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-mute);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  max-width: var(--about-max);
  margin-inline: auto;
  padding-block: var(--about-gap);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 20px);
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-chapter__no {
  flex: none;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan-400);
  padding-top: 4px;
}

.page-about .about-chapter h2 {
  margin: 0;
  font-size: clamp(1.35rem, 3.6vw, 2rem);
  line-height: 1.3;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-chapter__body p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

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

.page-about .about-link {
  color: var(--amber-600);
  text-decoration: none;
  border-bottom: 1px solid var(--line-amber);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--amber-500);
  border-bottom-color: var(--amber-500);
}

.page-about .about-side-note {
  margin-top: clamp(16px, 2.4vw, 22px) !important;
  padding-left: 14px;
  border-left: 2px solid var(--line-amber);
  font-size: 14px !important;
  color: var(--text-mute) !important;
}

/* ---------- 刻度分隔带 ---------- */
.page-about .about-scale-wrap {
  display: block;
  padding-inline: 0;
}

.page-about .about-scale {
  display: block;
  width: 100%;
  height: 24px;
}

/* ---------- 选题来源 ---------- */
.page-about .about-source {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .about-source__item {
  padding: 20px 18px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.page-about .about-source__item h3 {
  margin: 14px 0 8px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-source__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 图文双栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 4vw, 42px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .about-split__text p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

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

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

/* ---------- 推荐标准 ---------- */
.page-about .about-criteria {
  margin: 0 0 1.1em;
  padding: 0;
}

.page-about .about-criteria__row {
  display: grid;
  gap: 2px 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-criteria__row:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-criteria dt {
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan-400);
  letter-spacing: .01em;
}

.page-about .about-criteria dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 三个版本 ---------- */
.page-about .about-version {
  position: relative;
  padding-top: 34px;
}

.page-about .about-version__scale {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 24px;
}

.page-about .about-version__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
  grid-template-columns: 1fr;
}

.page-about .about-version__item {
  outline: none;
}

.page-about .about-version__item:focus-visible {
  outline: 1px solid var(--line-amber);
  outline-offset: 6px;
}

.page-about .about-version__dot {
  display: block;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--amber-600);
  box-shadow: 0 0 0 4px rgba(242, 160, 61, .18);
  margin-bottom: 16px;
}

.page-about .about-version__ver {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--amber-600);
}

.page-about .about-version__name {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-version__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-version__hint {
  display: block;
  max-height: 0;
  overflow: hidden;
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--cyan-400);
  transition: max-height .26s var(--ease), margin-top .26s var(--ease);
}

.page-about .about-version__item:hover .about-version__hint,
.page-about .about-version__item:focus-within .about-version__hint {
  max-height: 90px;
  margin-top: 10px;
}

/* ---------- 认可 ---------- */
.page-about .about-honor {
  list-style: none;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .about-honor__item {
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--turf-400);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(90deg, rgba(78, 208, 122, .06), transparent 70%);
}

.page-about .about-honor__year {
  margin: 0 0 4px;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--turf-400);
}

.page-about .about-honor__name {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
}

/* ---------- 三条坚持 ---------- */
.page-about .about-pledge {
  list-style: none;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}

.page-about .about-pledge__item {
  padding: 20px 18px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.page-about .about-pledge__idx {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber-600);
}

.page-about .about-pledge__item h3 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-pledge__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 横幅图 ---------- */
.page-about .about-banner {
  max-width: var(--about-max);
  margin-inline: auto;
  padding-block: clamp(4px, 1.4vw, 14px) clamp(28px, 4.4vw, 48px);
}

.page-about .about-banner .media-frame {
  margin: 0;
}

/* ---------- 票根信息块 ---------- */
.page-about .about-stubs-wrap {
  max-width: var(--about-max);
  margin-inline: auto;
  padding-block: clamp(28px, 4.4vw, 48px) 0;
}

.page-about .about-stubs-wrap__title {
  margin: 0 0 12px;
  font-size: clamp(1.3rem, 3.4vw, 1.85rem);
  line-height: 1.3;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-stubs-wrap__lead {
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-mute);
}

.page-about .about-stubs {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .about-stub {
  position: relative;
  background: var(--paper-soft);
  color: var(--pitch-900);
  border: 1px solid rgba(11, 31, 24, .16);
  border-top: 3px solid var(--amber-600);
  border-radius: 3px;
  padding: 16px 16px 14px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .38);
}

.page-about .about-stub summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-stub summary:focus-visible {
  outline: 2px solid #a8621a;
  outline-offset: 4px;
}

.page-about .about-stub__label {
  flex-basis: 100%;
  font-size: 11px;
  letter-spacing: .18em;
  color: #5d6b63;
  margin-bottom: 4px;
}

.page-about .about-stub__value {
  font-size: clamp(30px, 5.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--pitch-900);
}

.page-about .about-stub__unit {
  font-size: 13px;
  color: #5d6b63;
}

.page-about .about-stub__more {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: .14em;
  color: #a8621a;
  border-bottom: 1px dashed rgba(168, 98, 26, .5);
}

.page-about .about-stub__body {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed rgba(11, 31, 24, .24);
}

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

.page-about .about-stub__body li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.75;
  color: #3c4a42;
}

.page-about .about-stub__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #a8621a;
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 40px);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cta p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-cta__alt {
  font-size: 13px !important;
  color: var(--text-mute) !important;
  margin-bottom: 0 !important;
}

/* ---------- 响应式 ---------- */
@media (max-width: 819px) {
  .page-about .about-version {
    padding-top: 0;
  }

  .page-about .about-version__scale {
    display: none;
  }

  .page-about .about-version__hint {
    max-height: none;
    margin-top: 8px;
  }
}

@media (min-width: 620px) {
  .page-about .about-source {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-criteria__row {
    grid-template-columns: minmax(120px, 168px) minmax(0, 1fr);
    align-items: baseline;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .about-split--media-left .about-split__media {
    order: -1;
  }

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

  .page-about .about-version__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version__hint {
    transition: none;
  }

  .page-about .about-link {
    transition: none;
  }
}
<<<END>>>