.page-about {
  --about-hero-bg2: var(--c-violet-dark);
  --about-gold-alpha: rgba(212, 175, 55, 0.35);
  --about-glass-bg: rgba(43, 21, 64, 0.45);
  --about-timeline-bg: linear-gradient(180deg, #162E26 0%, #0B1A16 100%);
  position: relative;
  overflow-x: hidden;
  background: var(--c-ivory);
  color: var(--c-charcoal);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  color: rgba(255, 255, 240, 0.55);
  margin-bottom: 3rem;
}
.page-about .breadcrumb a {
  color: rgba(255, 255, 240, 0.75);
  text-decoration: none;
  transition: color var(--transition);
}
.page-about .breadcrumb a:hover {
  color: var(--c-gold);
}
.page-about .breadcrumb__sep {
  color: var(--c-gold);
}

/* 首屏封面 */
.page-about .about-hero {
  background:
    radial-gradient(ellipse at 78% 20%, rgba(212, 175, 55, 0.16) 0%, transparent 52%),
    linear-gradient(135deg, var(--c-green) 0%, var(--about-hero-bg2) 100%);
  color: var(--c-ivory);
  padding: calc(var(--header-h) + 2.5rem) 0 4rem;
  min-height: 72vh;
  display: flex;
  align-items: center;
}
.page-about .about-hero__grid {
  display: grid;
  gap: 2.5rem;
  align-items: end;
}
.page-about .about-hero__index {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.18em;
  color: var(--c-gold);
  text-transform: uppercase;
}
.page-about .about-hero__edition {
  color: rgba(255, 255, 240, 0.6);
}
.page-about .about-hero h1 {
  font-family: var(--font-serif);
  font-weight: 200;
  font-size: clamp(2.4rem, 6vw, 4.75rem);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--c-ivory);
  margin: 1.5rem 0 1.25rem;
}
.page-about .about-hero__title-sep {
  color: var(--c-gold);
  display: inline-block;
  margin: 0 0.2em;
  font-weight: 200;
}
.page-about .about-hero__lead {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  line-height: 1.8;
  color: rgba(255, 255, 240, 0.85);
  max-width: 58ch;
  margin: 0;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2.5rem;
}
.page-about .about-hero__aside {
  border-top: 1px solid var(--about-gold-alpha);
  padding-top: 1.5rem;
}
.page-about .about-hero__aside dl {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.85rem 2rem;
  margin: 0;
  font-family: var(--font-mono);
}
.page-about .about-hero__aside dt {
  font-size: var(--fs-micro);
  color: rgba(255, 255, 240, 0.6);
  letter-spacing: 0.12em;
}
.page-about .about-hero__aside dd {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-gold);
}

/* 品牌缘起 */
.page-about .brand-origin {
  background: var(--c-ivory);
  padding: 5rem 0 6rem;
  position: relative;
}
.page-about .brand-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-about .brand-origin__label {
  font-family: var(--font-mono);
  color: var(--c-primary-light);
  border-left: 2px solid var(--c-gold);
  padding-left: 1.25rem;
}
.page-about .brand-origin__label .section-index {
  display: block;
  font-size: 1.5rem;
  color: var(--c-gold);
}
.page-about .brand-origin__label .section-index__note {
  display: block;
  font-size: var(--fs-body);
  color: var(--c-primary);
  margin-top: 0.5rem;
  font-family: var(--font-serif);
  letter-spacing: 0.05em;
}
.page-about .brand-origin__label p {
  font-size: var(--fs-small);
  color: #777;
  margin: 0.5rem 0 0;
}
.page-about .brand-origin__content h2 {
  font-family: var(--font-serif);
  font-weight: 200;
  font-size: var(--fs-h2);
  color: var(--c-charcoal);
  margin: 0 0 1.5rem;
}
.page-about .brand-origin__content p {
  color: #444;
  line-height: 1.9;
  margin: 0 0 1.25rem;
  max-width: 62ch;
}
.page-about .brand-origin__content blockquote {
  margin: 2rem 0 0;
  padding: 1.5rem 1.75rem;
  border-left: 4px solid var(--c-gold);
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.12) 0%, transparent 100%);
  font-family: var(--font-serif);
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--c-primary-dark);
}

/* 章节标题 */
.page-about .section-header {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin-bottom: 2.5rem;
}
.page-about .section-header__text {
  flex: 1;
}
.page-about .section-header__text h2 {
  font-family: var(--font-serif);
  font-weight: 200;
  font-size: var(--fs-h2);
  margin: 0 0 0.5rem;
}
.page-about .section-header__text .section-note {
  margin: 0;
  line-height: 1.7;
}
.page-about .section-index {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  color: var(--c-primary);
}

/* 大事记时间轴 */
.page-about .story-timeline {
  background: var(--about-timeline-bg);
  color: var(--c-ivory);
  padding: 5rem 0;
}
.page-about .story-timeline .section-header__text h2 {
  color: var(--c-ivory);
}
.page-about .story-timeline .section-note {
  color: rgba(255, 255, 240, 0.65);
}
.page-about .story-timeline .section-index {
  color: var(--c-gold);
}
.page-about .timeline-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}
.page-about .timeline-filter__btn {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.1em;
  color: var(--c-gold);
  padding: 0.5rem 1rem;
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 999px;
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}
.page-about .timeline-filter__btn:hover,
.page-about .timeline-filter__btn:focus-visible {
  background: var(--c-gold);
  color: var(--c-green);
}
.page-about .timeline {
  position: relative;
}
.page-about .timeline::before {
  content: '';
  position: absolute;
  left: 9px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--c-gold), rgba(212, 175, 55, 0.12));
}
.page-about .timeline__item {
  position: relative;
  padding-left: 44px;
  margin-bottom: 3rem;
}
.page-about .timeline__item::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 1rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.22);
}
.page-about .timeline__item:target .timeline__card {
  box-shadow: 0 0 0 1px var(--c-gold), 0 8px 30px rgba(212, 175, 55, 0.12);
}
.page-about .timeline__item:target .timeline__year span {
  color: var(--c-gold-light);
}
.page-about .timeline__year span {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  color: var(--c-gold);
  display: block;
  line-height: 1;
}
.page-about .timeline__year em {
  font-family: var(--font-sans);
  font-style: normal;
  font-size: var(--fs-micro);
  color: rgba(255, 255, 240, 0.55);
  letter-spacing: 0.08em;
  margin-top: 0.4rem;
  display: inline-block;
}
.page-about .timeline__card {
  background: var(--about-glass-bg);
  border: 1px solid rgba(212, 175, 55, 0.15);
  padding: 1.75rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.page-about .timeline__card h3 {
  font-family: var(--font-serif);
  font-size: var(--fs-h3);
  font-weight: 400;
  color: var(--c-ivory);
  margin: 0 0 0.75rem;
}
.page-about .timeline__card p {
  color: rgba(255, 255, 240, 0.82);
  line-height: 1.8;
  margin: 0 0 1rem;
}
.page-about .timeline__card .frame {
  margin-top: 1.25rem;
}
.page-about .timeline__card img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

/* 版本对照 */
.page-about .version-compare {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 3.5rem;
}
.page-about .version-compare__card {
  padding: 2rem;
  border-radius: var(--radius-md);
  border-top: 3px solid var(--c-gold);
  background: rgba(43, 21, 64, 0.35);
  color: var(--c-ivory);
}
.page-about .version-compare__old {
  border-top-color: var(--c-primary-light);
  background: rgba(26, 26, 26, 0.3);
}
.page-about .version-compare__tag {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.15em;
  color: var(--c-gold);
  text-transform: uppercase;
}
.page-about .version-compare__card h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.25rem;
  margin: 0.5rem 0 0.6rem;
  color: var(--c-ivory);
}
.page-about .version-compare__card p {
  color: rgba(255, 255, 240, 0.8);
  font-size: var(--fs-small);
  line-height: 1.7;
  margin: 0 0 1.25rem;
}

/* 数据里程碑 */
.page-about .story-milestones {
  background: var(--c-gray);
  padding: 5rem 0;
}
.page-about .story-milestones .section-header__text h2,
.page-about .team-philosophy .section-header__text h2 {
  color: var(--c-charcoal);
}
.page-about .story-milestones .section-note,
.page-about .team-philosophy .section-note {
  color: #666;
}
.page-about .milestone-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}
.page-about .milestone-item {
  position: relative;
  background: var(--c-ivory);
  padding: 1.5rem;
  border-top: 3px solid var(--c-gold);
  box-shadow: 0 4px 18px rgba(43, 21, 64, 0.05);
}
.page-about .milestone-item::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 40px;
  background: linear-gradient(225deg, var(--c-gold) 0%, transparent 60%);
  opacity: 0.5;
}
.page-about .milestone-item__label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.12em;
  color: var(--c-primary-light);
}
.page-about .milestone-num {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-primary);
  margin: 0.35rem 0 0.5rem;
}
.page-about .milestone-desc {
  font-size: var(--fs-small);
  color: #555;
  line-height: 1.6;
  margin: 0;
}

/* 团队与理念 */
.page-about .team-philosophy {
  background: linear-gradient(180deg, var(--c-warm) 0%, var(--c-ivory) 100%);
  padding: 5rem 0;
}
.page-about .team-philosophy__grid {
  display: grid;
  gap: 3rem;
}
.page-about .team-philosophy__lead {
  max-width: 58ch;
  line-height: 1.8;
  color: #444;
  margin: 0 0 2rem;
}
.page-about .team-depts {
  display: grid;
  gap: 1.5rem;
}
.page-about .team-dept {
  border-left: 2px solid var(--c-gold);
  padding-left: 1.25rem;
  background: rgba(255, 255, 240, 0.4);
  padding: 1rem 1.25rem;
}
.page-about .team-dept h3 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  margin: 0 0 0.35rem;
  color: var(--c-primary-dark);
}
.page-about .team-dept p {
  font-size: var(--fs-small);
  color: #444;
  line-height: 1.7;
  margin: 0;
}
.page-about .team-philosophy__visual .frame {
  border-radius: var(--radius-md);
  overflow: hidden;
}
.page-about .team-philosophy__visual img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .philosophy-list {
  margin-top: 2rem;
  display: grid;
  gap: 1.25rem;
}
.page-about .philosophy-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.25rem;
  background: rgba(255, 255, 240, 0.6);
  border: 1px solid rgba(212, 175, 55, 0.2);
}
.page-about .philosophy-item__num {
  font-family: var(--font-mono);
  font-size: var(--fs-h3);
  color: var(--c-gold);
  border-right: 1px solid var(--c-gold);
  padding-right: 1rem;
  line-height: 1;
}
.page-about .philosophy-item h3 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  margin: 0 0 0.3rem;
  color: var(--c-primary-dark);
}
.page-about .philosophy-item p {
  font-size: var(--fs-small);
  color: #444;
  line-height: 1.7;
  margin: 0;
}

/* 结尾过渡 */
.page-about .story-next {
  background:
    linear-gradient(180deg, var(--c-green) 0%, var(--c-violet-dark) 100%);
  color: var(--c-ivory);
  padding: 4rem 0;
}
.page-about .story-next__grid {
  display: grid;
  gap: 2rem;
}
.page-about .story-next__intro h2 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 200;
  color: var(--c-ivory);
  margin: 0 0 0.5rem;
}
.page-about .story-next__intro p {
  color: rgba(255, 255, 240, 0.75);
  line-height: 1.7;
  margin: 0;
}
.page-about .story-next__links {
  display: grid;
  gap: 1.25rem;
}
.page-about .story-next__card {
  display: block;
  padding: 1.5rem;
  background: rgba(255, 255, 240, 0.08);
  border-left: 3px solid var(--c-gold);
  color: var(--c-ivory);
  text-decoration: none;
  transition: background var(--transition);
}
.page-about .story-next__card:hover {
  background: rgba(212, 175, 55, 0.12);
}
.page-about .story-next__card span {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--c-gold);
  letter-spacing: 0.14em;
  margin-bottom: 0.35rem;
}
.page-about .story-next__card strong {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.125rem;
}

/* 媒体查询：平板及以上 */
@media (min-width: 768px) {
  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 3rem;
    padding-left: 0;
  }
  .page-about .timeline::before {
    left: 180px;
  }
  .page-about .timeline__item::before {
    left: 176px;
  }
  .page-about .timeline__year {
    text-align: right;
    padding-right: 2rem;
    border-right: 1px solid var(--about-gold-alpha);
    align-self: start;
    padding-top: 1rem;
  }
  .page-about .timeline__year span {
    font-size: 3.5rem;
    line-height: 1;
  }
  .page-about .timeline__year em {
    display: block;
  }
  .page-about .version-compare {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .story-next__grid {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

/* 媒体查询：桌面 */
@media (min-width: 992px) {
  .page-about .about-hero__grid {
    grid-template-columns: 2fr 1fr;
    column-gap: 4rem;
  }
  .page-about .brand-origin__grid {
    grid-template-columns: 0.7fr 1.5fr;
    gap: 4rem;
  }
  .page-about .milestone-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
  }
  .page-about .team-philosophy__grid {
    grid-template-columns: 1.15fr 1fr;
    gap: 4rem;
    align-items: start;
  }
}