.page-about {
  --about-deep: var(--color-deep);
  --about-deep-2: var(--color-deep-2);
  --about-gold: var(--color-gold);
  --about-teal: var(--color-teal);
  --about-red: var(--color-red);
  --about-sand: var(--color-sand);
  --about-ink: var(--color-ink);
  --about-border: var(--color-border);
  --about-dune: var(--color-dune);
  --about-white: var(--color-white);
  --about-shadow: var(--shadow-card);
  --about-transition: var(--transition);
  --about-tl-dot: 14px;
}

.page-about__shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding: 1.5rem 1.25rem 4.5rem;
}

.page-about__rail {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.25rem 1rem;
  background: rgba(255, 255, 255, 0.64);
  border: 1px solid var(--about-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius);
}

.page-about__rail-label {
  border-color: var(--color-gold);
}

.page-about__toc {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  scrollbar-width: thin;
}

.page-about__toc-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.95rem;
  background: var(--about-white);
  border: 1px solid var(--about-border);
  border-radius: 999px;
  color: var(--about-deep);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--about-transition), transform var(--about-transition), box-shadow var(--about-transition);
}

.page-about__toc-link:hover,
.page-about__toc-link:focus-visible,
.page-about__toc-link[aria-current="location"] {
  border-color: var(--color-gold);
  color: var(--about-deep);
  transform: translateY(-2px);
  box-shadow: var(--about-shadow);
  outline: none;
}

.page-about__rail-note {
  margin: 0.25rem 0 0;
  padding: 0.875rem 1rem;
  background: var(--about-deep);
  border-left: 3px solid var(--color-gold);
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.875rem;
  line-height: 1.65;
}

.page-about__stage {
  min-width: 0;
}

.page-about__crumb {
  margin: 0 0 2rem;
}

.page-about__hero {
  position: relative;
  padding: 1.5rem 0 2rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--about-dune);
}

.page-about__hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 42%;
  min-width: 180px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-deep));
}

.page-about__hero .stage-title {
  max-width: 15ch;
  margin-top: 0.75rem;
  letter-spacing: -0.01em;
}

.page-about__lede {
  max-width: 60ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--about-ink);
}

.page-about__section {
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

/* 01 品牌起点 */
.page-about__origin {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.25rem;
  align-items: center;
  padding: 2.25rem 1.25rem 2.5rem;
  margin-block: 2rem;
  background: linear-gradient(118deg, var(--about-deep) 0%, var(--about-deep-2) 62%, var(--about-deep) 100%);
  clip-path: polygon(0 0, 100% 0, calc(100% - 24px) 100%, 0 100%);
  color: var(--about-white);
  overflow: hidden;
}

.page-about__origin::after {
  content: "";
  position: absolute;
  right: 6%;
  bottom: 8%;
  width: 220px;
  height: 100px;
  background: linear-gradient(180deg, rgba(201, 168, 106, 0.28), transparent 78%);
  clip-path: polygon(0 18%, 12% 0, 30% 22%, 52% 6%, 74% 18%, 100% 2%, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about__origin-copy {
  position: relative;
  z-index: 1;
}

.page-about__origin-copy .section-label {
  color: var(--color-gold);
  border-color: var(--color-gold);
}

.page-about__origin p {
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.8;
  font-size: 1rem;
}

.page-about__origin .page-about__trust {
  border-color: rgba(255, 255, 255, 0.28);
  color: var(--color-gold);
}

.page-about__fig {
  margin: 0;
}

.page-about__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--about-shadow);
}

.page-about__fig figcaption {
  margin-top: 0.8rem;
  padding-left: 0.8rem;
  border-left: 2px solid var(--color-gold);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.72);
}

.page-about__origin-fig img {
  border-radius: var(--radius) 0 var(--radius) 0;
  outline: 1px solid rgba(255, 255, 255, 0.3);
  outline-offset: 8px;
}

.page-about__trust {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--about-dune);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--about-deep);
}

/* 02 发展里程碑 */
.page-about__section-head {
  margin: 2.5rem 0 1.25rem;
}

.page-about__section-head p {
  margin: 0.5rem 0 0;
  max-width: 48ch;
  color: var(--about-ink);
  opacity: 0.8;
  line-height: 1.7;
}

.page-about__timeline {
  list-style: none;
  margin: 2rem 0 3.5rem;
  padding: 0 0 0 2.1rem;
  position: relative;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 2rem;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-teal) 68%, rgba(27, 127, 122, 0.08) 100%);
}

.page-about__timeline-item {
  position: relative;
  margin-bottom: 1.4rem;
}

.page-about__timeline-dot {
  position: absolute;
  left: calc(-2.1rem + 3px);
  top: 0.9rem;
  width: var(--about-tl-dot);
  height: var(--about-tl-dot);
  border-radius: 50%;
  background: var(--about-sand);
  border: 3px solid var(--about-deep);
  box-shadow: 0 0 0 1px var(--color-gold);
}

.page-about__timeline-card {
  padding: 1.25rem 1.4rem;
  background: var(--about-white);
  border: 1px solid var(--about-border);
  border-radius: var(--radius);
  box-shadow: var(--about-shadow);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
}

.page-about__timeline-card:hover {
  transform: translateX(4px);
  box-shadow: 0 10px 30px rgba(10, 31, 60, 0.12);
}

.page-about__timeline-card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--about-deep);
}

.page-about__timeline-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--about-ink);
}

/* 03 服务理念 */
.page-about__philosophy-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  margin-block: 1.5rem 2rem;
}

.page-about__philosophy-card {
  position: relative;
  padding: 1.75rem 1.5rem;
  background: var(--about-white);
  border: 1px solid var(--about-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--about-transition), box-shadow var(--about-transition);
}

.page-about__philosophy-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--about-shadow);
}

.page-about__philosophy-card::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 36px;
  height: 36px;
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  background: var(--about-dune);
  opacity: 0.3;
}

.page-about__philosophy-card--deep {
  background: linear-gradient(145deg, var(--about-deep), var(--about-deep-2));
  border-color: transparent;
}

.page-about__philosophy-card--deep::after {
  background: var(--color-gold);
  opacity: 0.3;
}

.page-about__philosophy-card h3 {
  margin: 0 0 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--about-deep);
}

.page-about__philosophy-card--deep h3 {
  color: var(--color-gold);
}

.page-about__philosophy-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--about-ink);
}

.page-about__philosophy-card--deep p {
  color: rgba(255, 255, 255, 0.82);
}

.page-about__cta {
  padding: 1.25rem 1.5rem;
  background: rgba(10, 31, 60, 0.05);
  border: 1px dashed var(--about-dune);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--about-ink);
}

.page-about__cta p {
  margin: 0;
}

.page-about__cta a {
  color: var(--color-teal);
  font-family: var(--font-heading);
  font-weight: 700;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

/* 04 团队介绍 */
.page-about__team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding: 2rem 0 1rem;
  border-top: 3px solid var(--about-dune);
  background: linear-gradient(180deg, rgba(217, 197, 160, 0.22), transparent 70%);
}

.page-about__team-copy p {
  margin: 1rem 0 0;
  line-height: 1.85;
  color: var(--about-ink);
}

.page-about__team-copy .page-about__trust {
  color: var(--about-deep);
}

.page-about__team-fig {
  align-self: center;
}

.page-about__team-fig img {
  border-radius: 2px;
  border: 1px solid var(--about-border);
}

.page-about__team-fig figcaption,
.page-about__honor-fig figcaption {
  color: var(--about-ink);
  opacity: 0.75;
}

/* 05 资质与荣誉 */
.page-about__honors-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.page-about__honor-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.page-about__honor-card {
  padding: 1.75rem 1.5rem 1.25rem;
  background: var(--about-white);
  border: 1px solid var(--about-border);
  border-radius: var(--radius);
  box-shadow: var(--about-shadow);
}

.page-about__honor-badge {
  display: inline-block;
  padding: 0.3rem 0.65rem;
  margin-bottom: 0.8rem;
  background: var(--about-deep);
  color: var(--color-gold);
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 2px;
}

.page-about__honor-card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--about-deep);
}

.page-about__honor-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--about-ink);
}

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.page-about__stat {
  padding: 1.1rem 0.75rem;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--about-border);
  text-align: center;
}

.page-about__stat strong {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--about-deep);
  line-height: 1.1;
}

.page-about__stat strong::after {
  content: "";
  display: block;
  width: 24px;
  height: 3px;
  margin: 7px auto 0;
  background: var(--color-gold);
}

.page-about__stat span {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.8125rem;
  color: var(--about-ink);
  opacity: 0.8;
}

.page-about__honor-fig {
  align-self: end;
}

.page-about__honor-fig img {
  border-radius: 2px;
  border: 1px solid var(--about-dune);
}

.page-about__honor-note {
  margin: 2.5rem 0 0;
  padding: 1.25rem 1.5rem;
  background: rgba(201, 168, 106, 0.09);
  border-left: 4px solid var(--color-gold);
  line-height: 1.8;
  color: var(--about-ink);
}

.page-about__honor-note a {
  color: var(--about-deep);
  font-family: var(--font-heading);
  font-weight: 700;
  text-decoration-color: var(--color-gold);
  text-underline-offset: 4px;
}

/* 平板断点 */
@media (min-width: 700px) {
  .page-about__shell {
    padding-inline: 2rem;
  }

  .page-about__toc {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.5rem;
    overflow: visible;
  }

  .page-about__toc-link {
    white-space: normal;
    text-align: center;
    justify-content: center;
  }

  .page-about__toc-link {
    padding: 0.6rem 0.4rem;
    font-size: 0.8125rem;
    border-radius: 4px;
  }

  .page-about__origin {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 2.5rem;
    padding: 3rem 2.5rem 3rem 2rem;
    clip-path: polygon(0 0, 100% 0, 96% 100%, 0 100%);
  }

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

  .page-about__team {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 2.5rem;
    align-items: center;
    padding-block: 3rem 2rem;
  }

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

  .page-about__stats {
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about__honor-note {
    max-width: 76ch;
  }
}

/* 桌面断点：左轨右内容 */
@media (min-width: 992px) {
  .page-about__shell {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: 3rem;
    padding-top: 2.5rem;
  }

  .page-about__rail {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
    align-self: start;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 0;
    background: transparent;
    border: 0;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .page-about__rail-head {
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-border);
  }

  .page-about__toc {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0;
    border-left: 2px solid var(--color-border);
    padding-left: 1.1rem;
    overflow: visible;
  }

  .page-about__toc-link {
    display: block;
    padding: 0.5rem 0;
    background: none;
    border: 0;
    border-radius: 0;
    font-size: 0.9375rem;
    text-align: left;
    white-space: normal;
    color: var(--about-deep);
  }

  .page-about__toc-link::before {
    content: "";
    position: absolute;
    left: -1.1rem;
    width: 3px;
    height: 0;
    background: var(--color-gold);
    transition: height var(--about-transition);
  }

  .page-about__toc-link:hover,
  .page-about__toc-link:focus-visible,
  .page-about__toc-link[aria-current="location"] {
    transform: none;
    box-shadow: none;
    border-color: transparent;
    color: var(--about-deep);
  }

  .page-about__toc-link:hover::before,
  .page-about__toc-link:focus-visible::before,
  .page-about__toc-link[aria-current="location"]::before {
    height: 100%;
  }

  .page-about__rail-note {
    font-size: 0.8125rem;
  }

  .page-about__milestones .page-about__section-head {
    display: grid;
    grid-template-columns: 24% minmax(0, 1fr);
    align-items: end;
    gap: 2rem;
  }

  .page-about__timeline {
    padding-left: 3rem;
    margin-top: 2.5rem;
  }

  .page-about__timeline::before {
    left: 11px;
  }

  .page-about__timeline-dot {
    left: calc(-3rem + 4px);
    width: 15px;
    height: 15px;
  }

  .page-about__timeline-card {
    padding: 1.5rem 2rem;
  }

  .page-about__philosophy {
    background: linear-gradient(135deg, rgba(201, 168, 106, 0.1), transparent 32%);
  }

  .page-about__honors-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 3rem;
    align-items: start;
  }

  .page-about__honor-fig {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }

  .page-about__team-fig img {
    height: auto;
    max-height: 520px;
  }
}