.page-about {
  --about-rail: 14rem;
  --about-gap: clamp(1.5rem, 4vw, 3.5rem);
  --about-soft: rgba(244, 239, 230, 0.72);
  --about-mute: rgba(244, 239, 230, 0.52);
  --about-line: rgba(217, 192, 138, 0.2);
  --about-line-strong: rgba(217, 192, 138, 0.44);
  display: block;
  background: var(--dbs-pine-deep);
  color: var(--dbs-bone);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-about .about-crumb {
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
  color: var(--about-mute);
  font-family: var(--dbs-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.page-about .about-crumb a {
  color: var(--dbs-gold-soft);
  text-decoration: none;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--dbs-bone);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(1.25rem, 3vw, 2.25rem);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  padding-block: clamp(0.75rem, 2vw, 1.5rem) clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .about-hero__stamp {
  margin: 0;
  font-family: var(--dbs-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  color: var(--dbs-gold);
}

.page-about .about-hero__title {
  font-family: var(--dbs-font-display);
  font-weight: 300;
  font-size: clamp(2.3rem, 7.2vw, 4.6rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0.7rem 0 0;
  color: var(--dbs-bone);
  max-width: 15ch;
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.9;
  color: var(--about-soft);
  max-width: 48ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: clamp(1.1rem, 2.5vw, 1.6rem);
}

.page-about .about-stats {
  margin: 0 0 clamp(1.5rem, 3.5vw, 2.5rem);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-stats__cell {
  background: var(--dbs-pine-deep);
  padding: 0.9rem 1rem 1rem;
}

.page-about .about-stats dt {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--about-mute);
}

.page-about .about-stats dd {
  margin: 0.4rem 0 0;
  font-family: var(--dbs-font-mono);
  font-size: 1.125rem;
  color: var(--dbs-gold-soft);
}

.page-about .about-hero__media {
  margin: 0;
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.78) contrast(1.04);
  transition: filter 0.6s var(--dbs-ease);
}

.page-about .about-hero__media:hover img {
  filter: saturate(0.95) contrast(1.06);
}

/* ---------- 正文骨架 ---------- */

.page-about .about-body {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(2rem, 5vw, 3.5rem);
}

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

.page-about .about-index__head {
  margin: 0 0 0.85rem;
  font-family: var(--dbs-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--dbs-gold);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.05rem;
}

.page-about .about-index__link {
  display: grid;
  grid-template-columns: 1.9rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: baseline;
  padding: 0.5rem 0;
  border-left: 1px solid var(--about-line);
  padding-left: 0.85rem;
  color: var(--about-mute);
  text-decoration: none;
  font-family: var(--dbs-font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  transition: color 0.3s var(--dbs-ease), border-color 0.3s var(--dbs-ease),
    padding-left 0.3s var(--dbs-ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--dbs-gold-soft);
  border-left-color: var(--dbs-gold);
  padding-left: 1.15rem;
}

/* ---------- 章节通用 ---------- */

.page-about .about-chapter {
  padding-block: clamp(2rem, 5vw, 3.25rem);
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 6rem;
}

.page-about .about-chapter:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--dbs-font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.22em;
  color: var(--dbs-gold);
}

.page-about .about-chapter__title {
  font-family: var(--dbs-font-display);
  font-weight: 300;
  font-size: clamp(1.55rem, 3.6vw, 2.5rem);
  line-height: 1.18;
  margin: 0.6rem 0 0;
  color: var(--dbs-bone);
  max-width: 26ch;
}

.page-about .about-chapter__body {
  margin-top: clamp(1rem, 2.5vw, 1.6rem);
  display: grid;
  gap: 0.95rem;
  max-width: 68ch;
}

.page-about .about-chapter__body p {
  margin: 0;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-chapter__grid {
  margin-top: clamp(1rem, 2.5vw, 1.6rem);
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-chapter__text {
  display: grid;
  gap: 0.95rem;
  max-width: 62ch;
}

.page-about .about-chapter__text p {
  margin: 0;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-inline-figure {
  margin: 0;
}

.page-about .about-inline-figure .dbs-figure__media {
  overflow: hidden;
}

.page-about .about-inline-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.78);
  transition: filter 0.6s var(--dbs-ease);
}

.page-about .about-inline-figure:hover img {
  filter: saturate(0.95);
}

.page-about .about-inline-figure .dbs-figure__caption {
  margin-top: 0.7rem;
  font-family: var(--dbs-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--about-mute);
}

.page-about .about-inline-figure--wide {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
  border-left: 1px solid var(--about-line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(1.25rem, 3vw, 1.9rem) clamp(1.2rem, 3vw, 2rem);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 0.5rem;
  width: 8px;
  height: 8px;
  background: var(--dbs-gold);
  transform: rotate(45deg);
  transition: transform 0.35s var(--dbs-ease), background 0.35s var(--dbs-ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  transform: rotate(45deg) scale(1.55);
  background: var(--dbs-amber);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--dbs-font-mono);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--dbs-gold-soft);
}

.page-about .about-timeline__title {
  font-family: var(--dbs-font-display);
  font-weight: 400;
  font-size: clamp(1.05rem, 2vw, 1.32rem);
  margin: 0.35rem 0 0.4rem;
  color: var(--dbs-bone);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-soft);
  max-width: 58ch;
}

/* ---------- 服务场景 ---------- */

.page-about .about-scenes {
  margin-top: clamp(1.25rem, 3vw, 2rem);
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-scene {
  background: var(--dbs-stone);
  padding: clamp(1.1rem, 2.5vw, 1.6rem);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: background 0.35s var(--dbs-ease);
}

.page-about .about-scene:hover {
  background: #46524f;
}

.page-about .about-scene .dbs-tag {
  align-self: flex-start;
}

.page-about .about-scene__title {
  font-family: var(--dbs-font-display);
  font-weight: 400;
  font-size: 1.08rem;
  margin: 0;
  color: var(--dbs-bone);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco {
  margin-top: clamp(1.25rem, 3vw, 2rem);
  display: grid;
  gap: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .about-eco__item {
  border-top: 1px solid var(--about-line-strong);
  padding-top: 0.95rem;
}

.page-about .about-eco__num {
  display: block;
  font-family: var(--dbs-font-mono);
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  line-height: 1;
  color: var(--dbs-gold-soft);
}

.page-about .about-eco__label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--about-mute);
}

.page-about .about-eco__desc {
  margin: 0.6rem 0 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-honor {
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
  padding-left: 1rem;
  border-left: 2px solid var(--dbs-clay);
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-soft);
}

/* ---------- 资质与联系 ---------- */

.page-about .about-chapter--seal {
  margin-block: clamp(1.5rem, 4vw, 2.5rem);
  padding: clamp(1.5rem, 4vw, 2.75rem);
  background: var(--dbs-bone);
  border-top: none;
  border-radius: 2px;
  color: var(--dbs-ink);
}

.page-about .about-chapter--seal .about-chapter__num {
  color: var(--dbs-clay);
}

.page-about .about-chapter--seal .about-chapter__title {
  color: var(--dbs-ink);
}

.page-about .about-seal__text {
  margin: clamp(1rem, 2.5vw, 1.4rem) 0 0;
  max-width: 64ch;
  line-height: 1.9;
  color: rgba(16, 22, 20, 0.78);
}

.page-about .about-seal__contact {
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-chapter--seal .dbs-contact__key {
  color: rgba(16, 22, 20, 0.55);
}

.page-about .about-chapter--seal .dbs-contact__val {
  color: var(--dbs-ink);
}

.page-about .about-seal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .about-seal__actions .dbs-btn--line {
  color: var(--dbs-pine);
  border-color: rgba(11, 43, 38, 0.35);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-seal__contact .dbs-contact__item:last-child {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    column-gap: var(--about-gap);
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 6rem minmax(0, 1fr);
    column-gap: 1.25rem;
  }

  .page-about .about-timeline__item::before {
    top: 0.45rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 6.5rem;
    align-self: start;
  }

  .page-about .about-chapter__title {
    max-width: 30ch;
  }
}

@media (min-width: 1120px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-scene,
  .page-about .about-hero__media img,
  .page-about .about-inline-figure img,
  .page-about .about-timeline__item::before {
    transition: none;
  }
}
</style>