.page-about {
  --about-gradient: linear-gradient(120deg, var(--color-primary), var(--color-secondary));
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow: hidden;
}

.page-about .about-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ========== 面包屑 ========== */
.page-about .about-breadcrumb {
  padding-top: 1.5rem;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "·";
  margin-right: 0.5rem;
  color: var(--color-secondary);
}

.page-about .breadcrumbs__link {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.3s var(--ease);
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.page-about .breadcrumbs__current {
  color: var(--color-text);
  font-weight: 500;
}

/* ========== 首屏框景 ========== */
.page-about .about-hero {
  padding-block: 2rem 4.5rem;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.page-about .about-hero__media {
  position: relative;
  width: 100%;
  max-width: 320px;
  margin-inline: auto;
  order: 2;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
  filter: saturate(0.9) contrast(1.06);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 16px -16px -16px 16px;
  border: 1px solid rgba(255, 46, 108, 0.45);
  z-index: 1;
  pointer-events: none;
}

.page-about .about-hero__media::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(255, 46, 108, 0.18), transparent 55%);
  z-index: 2;
  pointer-events: none;
}

.page-about .about-hero__spade {
  position: absolute;
  right: -18px;
  bottom: -24px;
  width: 64px;
  height: 64px;
  color: var(--color-secondary);
  z-index: 3;
  opacity: 0.75;
  filter: drop-shadow(0 0 12px rgba(155, 77, 202, 0.5));
}

.page-about .about-hero__content {
  order: 1;
}

.page-about .about-hero__index {
  margin: 0 0 1rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.page-about .about-hero__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  line-height: 1.08;
  letter-spacing: 0.05em;
}

.page-about .about-hero__title .accent {
  display: block;
  background: var(--about-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lead {
  margin: 0 0 1.5rem;
  max-width: 32em;
  color: var(--color-muted);
  font-size: 1rem;
}

.page-about .about-hero__meta {
  margin: 0;
  padding-left: 0.75rem;
  border-left: 3px solid var(--color-primary);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--color-text);
}

/* ========== 通用章节头 ========== */
.page-about .about-section {
  padding-block: 3.5rem 4rem;
  border-top: 1px solid var(--color-panel);
}

.page-about .about-section__head {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.page-about .about-section__head .section-index {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-secondary);
}

.page-about .about-section__head .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  line-height: 1.2;
  color: var(--color-text);
}

/* ========== 起源与时间轴 ========== */
.page-about .about-origin__layout {
  display: grid;
  gap: 2.5rem;
}

.page-about .about-origin__intro p {
  margin: 0;
  max-width: 32em;
  color: var(--color-muted);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 2.25rem 2.5rem;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 17px;
  height: 17px;
  border: 2px solid var(--color-primary);
  background: var(--color-bg);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(255, 46, 108, 0.12);
}

.page-about .about-timeline__year {
  display: inline-flex;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.4rem;
  color: var(--color-primary);
  letter-spacing: 0.06em;
}

.page-about .about-timeline__item p {
  margin: 0.25rem 0 0;
  max-width: 34em;
  color: var(--color-muted);
}

.page-about .about-timeline__item a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  transition: color 0.3s var(--ease);
}

.page-about .about-timeline__item a:hover,
.page-about .about-timeline__item a:focus-visible {
  color: var(--color-primary);
}

/* ========== 核心数据仪表板 ========== */
.page-about .about-dashboard {
  background: var(--color-panel);
  margin-inline: calc(50% - 50vw);
  padding-block: 4rem;
}

.page-about .about-dashboard .about-section__head .section-title {
  color: var(--color-text);
}

.page-about .about-dashboard__visual {
  margin: 0 0 2.75rem;
}

.page-about .about-dashboard__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
}

.page-about .about-cockpit {
  display: grid;
  grid-template-columns: 1fr;
  margin: 0;
}

.page-about .about-cockpit__item {
  position: relative;
  margin: 0;
  padding: 1.4rem 0.5rem 1.4rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  transition: background-color 0.3s var(--ease);
}

.page-about .about-cockpit__item:hover,
.page-about .about-cockpit__item:focus-within {
  background: var(--glass-bg);
}

.page-about .about-cockpit dt {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.page-about .about-cockpit dd {
  margin: 0.45rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.7rem, 4vw, 2.8rem);
  line-height: 1.15;
  color: var(--color-text);
}

.page-about .about-cockpit dd.accent {
  background: var(--about-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-cockpit__note {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

/* ========== 12大题材体系 ========== */
.page-about .about-genre__intro {
  margin: 0 0 2.5rem;
  max-width: 34em;
  color: var(--color-muted);
}

.page-about .about-genre__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--color-panel);
}

.page-about .genre-card {
  display: grid;
  grid-template-columns: 3rem 1fr;
  column-gap: 0.75rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--color-panel);
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.3s var(--ease), background-color 0.3s var(--ease), padding-left 0.25s var(--ease);
}

.page-about .genre-card__num {
  padding-top: 0.45rem;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--color-muted);
}

.page-about .genre-card__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.15rem;
}

.page-about .genre-card__desc {
  grid-column: 2;
  font-size: 0.8rem;
  color: var(--color-muted);
}

.page-about .genre-card:hover,
.page-about .genre-card:focus-visible {
  background: var(--glass-bg);
  color: var(--color-primary);
  padding-left: 0.75rem;
}

.page-about .genre-card:hover .genre-card__desc,
.page-about .genre-card:focus-visible .genre-card__desc {
  color: var(--color-text);
}

/* ========== 更新纪律承诺 ========== */
.page-about .about-promise {
  padding-block: 3.5rem 4rem;
  border-top: 1px solid var(--color-panel);
}

.page-about .about-promise__grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.page-about .about-promise__media {
  position: relative;
  order: 2;
}

.page-about .about-promise__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 4px;
}

.page-about .about-promise__media::before {
  content: "";
  position: absolute;
  inset: 12px -12px -12px 12px;
  border: 1px solid rgba(155, 77, 202, 0.5);
  z-index: -1;
}

.page-about .about-promise__content {
  order: 1;
}

.page-about .about-promise__content .section-index {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-secondary);
}

.page-about .about-promise__content .section-title {
  margin: 0 0 1rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  line-height: 1.2;
  color: var(--color-text);
}

.page-about .about-promise__lead {
  margin: 0 0 1.75rem;
  max-width: 32em;
  color: var(--color-muted);
}

.page-about .promise-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .promise-list__item {
  position: relative;
  padding: 0 0 1.25rem 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.page-about .promise-list__item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .promise-list__icon {
  position: absolute;
  left: 0;
  top: 0.1rem;
  color: var(--color-primary);
  font-size: 1.1rem;
}

.page-about .promise-list__item strong {
  display: block;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.25rem;
}

.page-about .promise-list__item p {
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.page-about .about-promise__more {
  margin: 1.75rem 0 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.page-about .about-promise__more a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  margin-inline: 0.2em;
  transition: color 0.3s var(--ease);
}

.page-about .about-promise__more a:hover,
.page-about .about-promise__more a:focus-visible {
  color: var(--color-primary);
}

/* ========== 底部 CTA ========== */
.page-about .about-cta {
  padding-block: 2rem 4.5rem;
  border-top: 1px solid var(--color-panel);
}

.page-about .about-cta__text {
  margin: 0 0 1.5rem;
  max-width: 32em;
  color: var(--color-muted);
}

.page-about .about-cta .btn {
  margin-right: 0.75rem;
  margin-bottom: 0.5rem;
}

/* ========== 响应式：平板 ========== */
@media (min-width: 640px) {
  .page-about .about-cockpit {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 2.5rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-block: 3rem 5rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 38% 1fr;
    gap: 3.5rem;
  }

  .page-about .about-hero__media {
    order: 1;
    max-width: none;
  }

  .page-about .about-hero__content {
    order: 2;
  }

  .page-about .about-origin__layout {
    grid-template-columns: 280px 1fr;
    gap: 4rem;
  }

  .page-about .about-origin__intro {
    position: sticky;
    top: 6rem;
    align-self: start;
  }

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

  .page-about .about-genre__grid {
    grid-template-columns: repeat(3, 1fr);
    column-gap: 2.5rem;
  }

  .page-about .genre-card {
    display: block;
    padding: 1rem 0.5rem 1.75rem;
  }

  .page-about .genre-card__num {
    display: block;
    padding-top: 0;
    margin-bottom: 0.5rem;
  }

  .page-about .genre-card__desc {
    grid-column: auto;
  }

  .page-about .about-promise__grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 3.5rem;
  }

  .page-about .about-promise__media {
    order: 1;
  }

  .page-about .about-promise__content {
    order: 2;
  }

  .page-about .about-promise__img {
    aspect-ratio: 1 / 1;
  }
}

@media (min-width: 1200px) {
  .page-about .about-cockpit {
    grid-template-columns: repeat(3, 1fr);
    column-gap: 3rem;
  }

  .page-about .about-genre__grid {
    column-gap: 3rem;
  }
}