.page-about {
  --about-soft: rgba(255, 255, 255, .78);
  --about-soft-dim: rgba(255, 255, 255, .58);
  background: var(--db-paper);
  color: var(--db-ink);
  font-family: var(--db-sans);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 28px 0 52px;
  background: var(--db-indigo);
  color: var(--db-white);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: auto -30% -34% 18%;
  height: 82%;
  background: var(--db-teal);
  clip-path: polygon(22% 0, 100% 14%, 100% 100%, 0 100%);
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 132px;
  height: 6px;
  background: var(--db-orange);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 34px;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--about-soft-dim);
}

.page-about .about-crumbs__link {
  color: var(--about-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.page-about .about-crumbs__link:hover {
  border-bottom-color: var(--db-orange);
}

.page-about .about-crumbs__now {
  color: var(--db-gold);
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  font-size: .8125rem;
  letter-spacing: .2em;
  color: var(--db-gold);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 40px;
  height: 2px;
  background: var(--db-orange);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  max-width: 15em;
  font-size: clamp(2.05rem, 6.4vw, 4.1rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.02em;
}

.page-about .about-hero__lead {
  max-width: 38em;
  margin: 0 0 30px;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 34px;
  margin: 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, .18);
}

.page-about .about-hero__fact {
  display: flex;
  align-items: baseline;
  gap: 9px;
}

.page-about .about-hero__fact b {
  font-size: 1.5rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--db-white);
}

.page-about .about-hero__fact span {
  font-size: .8125rem;
  color: var(--about-soft-dim);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  padding: 40px 0 64px;
}

.page-about .about-toc {
  margin: 0 0 34px;
  padding: 10px 0;
  border-top: 1px solid var(--db-line);
  border-bottom: 1px solid var(--db-line);
  overflow-x: auto;
}

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

.page-about .about-toc__list {
  display: flex;
  gap: 22px;
  margin: 0;
  padding: 0 2px;
  list-style: none;
  white-space: nowrap;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: .8125rem;
  color: var(--db-gray);
  text-decoration: none;
}

.page-about .about-toc__link:hover {
  color: var(--db-blue);
}

.page-about .about-toc__no {
  font-family: var(--db-serif);
  color: var(--db-indigo);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-bottom: 52px;
}

.page-about .about-chapter + .about-chapter {
  padding-top: 44px;
  border-top: 1px solid var(--db-line);
}

.page-about .about-chapter--last {
  padding-bottom: 8px;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 22px;
}

.page-about .about-chapter__index {
  flex: none;
  font-family: var(--db-serif);
  font-size: clamp(1.9rem, 5vw, 2.9rem);
  font-weight: 700;
  line-height: .95;
  color: var(--db-indigo);
  font-variant-numeric: tabular-nums;
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.35rem, 3.4vw, 1.95rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
}

.page-about .about-chapter p {
  max-width: 40em;
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.85;
  color: #263046;
}

.page-about .about-chapter__lede {
  font-size: 1.0625rem !important;
  color: var(--db-ink) !important;
  font-weight: 500;
}

/* ---------- 使命三步 ---------- */
.page-about .about-mission {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-mission__item {
  position: relative;
  padding: 22px 22px 20px;
  background: var(--db-white);
  border: 1px solid var(--db-line);
  border-left: 4px solid var(--db-blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-mission__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--db-serif);
  font-size: 1rem;
  color: var(--db-orange);
}

.page-about .about-mission__title {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 800;
}

.page-about .about-mission__item p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--db-gray);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

.page-about .about-stats {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  padding: 20px 20px 22px;
  background: var(--db-white);
  border: 1px solid var(--db-line);
  border-top: 3px solid var(--db-indigo);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-stat__num {
  display: block;
  margin-bottom: 6px;
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1;
  color: var(--db-indigo);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  margin-left: 4px;
  font-size: .875rem;
  font-weight: 600;
  color: var(--db-gray);
}

.page-about .about-stat__name {
  margin: 0 0 8px;
  font-size: .9375rem;
  font-weight: 800;
  color: var(--db-ink);
}

.page-about .about-stat p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--db-gray);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure__media {
  overflow: hidden;
  background: var(--db-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-figure__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure__cap {
  margin-top: 10px;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--db-gray);
}

.page-about .about-figure--wide {
  margin-top: 26px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 11px;
  width: 2px;
  background: linear-gradient(180deg, var(--db-indigo), var(--db-teal) 55%, var(--db-wine));
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 12px;
  padding-left: 40px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--db-paper);
  border: 3px solid var(--db-indigo);
}

.page-about .about-timeline__item:nth-child(even)::before {
  border-color: var(--db-teal);
}

.page-about .about-timeline__node {
  background: var(--db-white);
  border: 1px solid var(--db-line);
  border-left: 3px solid var(--db-teal);
  padding: 14px 18px;
}

.page-about .about-timeline__node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__node summary::marker {
  content: "";
}

.page-about .about-timeline__year {
  font-family: var(--db-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--db-wine);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__label {
  font-size: 1rem;
  font-weight: 800;
  color: var(--db-ink);
}

.page-about .about-timeline__node[open] {
  border-left-color: var(--db-orange);
}

.page-about .about-timeline__node p {
  margin: 10px 0 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--db-gray);
}

/* ---------- 质检 ---------- */
.page-about .about-quality {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.page-about .about-quality__list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-quality__item {
  padding: 20px;
  background: var(--db-white);
  border: 1px solid var(--db-line);
}

.page-about .about-quality__item h3 {
  margin: 12px 0 6px;
  font-size: 1rem;
  font-weight: 800;
}

.page-about .about-quality__item p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--db-gray);
}

.page-about .about-quality__note {
  margin-top: 22px !important;
  padding: 16px 18px;
  background: rgba(217, 179, 108, .14);
  border-left: 3px solid var(--db-gold);
  font-size: .9375rem !important;
  color: var(--db-ink) !important;
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-partner {
  padding: 16px 18px;
  background: var(--db-white);
  border: 1px solid var(--db-line);
  border-left: 3px solid var(--db-indigo);
}

.page-about .about-partner summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: .9375rem;
  font-weight: 700;
  color: var(--db-ink);
  list-style: none;
}

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

.page-about .about-partner summary::marker {
  content: "";
}

.page-about .about-partner p {
  margin: 12px 0 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--db-gray);
}

/* ---------- 承诺 ---------- */
.page-about .about-quote {
  margin: 0 0 26px;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--db-gold);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 32em;
  font-family: var(--db-serif);
  font-size: clamp(1.15rem, 3vw, 1.5rem);
  line-height: 1.6;
  color: var(--db-teal);
}

.page-about .about-commit {
  display: grid;
  gap: 20px;
}

.page-about .about-commit__panel {
  padding: 24px 22px;
  background: var(--db-white);
  border: 1px solid var(--db-line);
  border-top: 3px solid var(--db-indigo);
}

.page-about .about-commit__title {
  margin: 0 0 14px;
  font-size: 1rem;
  font-weight: 800;
}

.page-about .about-commit__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-commit__list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 10px;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--db-gray);
}

.page-about .about-commit__list li::before {
  content: "";
  position: absolute;
  top: .72em;
  left: 0;
  width: 8px;
  height: 2px;
  background: var(--db-orange);
}

.page-about .about-commit__card {
  padding: 26px 22px;
  background: var(--db-teal);
  color: var(--db-white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-commit__label {
  margin: 0 0 8px;
  font-size: .8125rem;
  letter-spacing: .14em;
  color: var(--db-gold);
}

.page-about .about-commit__tel {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--db-white);
  text-decoration: none;
  font-variant-numeric: tabular-nums;
  border-bottom: 2px solid var(--db-orange);
}

.page-about .about-commit__mail,
.page-about .about-commit__addr {
  margin: 0 0 6px;
  font-size: .9375rem;
  color: var(--about-soft);
  word-break: break-word;
}

.page-about .about-commit__note {
  margin: 14px 0 20px !important;
  font-size: .8125rem !important;
  line-height: 1.7;
  color: var(--about-soft-dim) !important;
}

.page-about .about-commit__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-commit__more {
  margin: 18px 0 0 !important;
  font-size: .8125rem !important;
  line-height: 1.7;
  color: var(--about-soft-dim) !important;
}

.page-about .about-commit__more a {
  color: var(--db-gold);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 平板 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero {
    padding: 40px 0 66px;
  }

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

  .page-about .about-mission__item:first-child {
    grid-column: 1 / -1;
  }

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

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

  .page-about .about-quality__item:last-child {
    grid-column: 1 / -1;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 56px 0 92px;
  }

  .page-about .about-crumbs {
    margin-bottom: 48px;
  }

  .page-about .about-hero::before {
    inset: auto -12% -42% 34%;
    height: 92%;
  }

  .page-about .about-hero__facts {
    gap: 18px 48px;
  }

  .page-about .about-body {
    display: grid;
    grid-template-columns: 218px minmax(0, 1fr);
    gap: 72px;
    padding: 80px 0 100px;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 112px;
    margin: 0;
    padding: 0;
    border: 0;
    overflow: visible;
    background: transparent;
  }

  .page-about .about-toc__title {
    display: block;
    margin: 0 0 16px;
    font-family: var(--db-serif);
    font-size: .8125rem;
    letter-spacing: .22em;
    color: var(--db-gray);
  }

  .page-about .about-toc__list {
    display: block;
    padding: 0;
    white-space: normal;
  }

  .page-about .about-toc__list li {
    margin: 0;
  }

  .page-about .about-toc__link {
    display: flex;
    gap: 10px;
    padding: 10px 0 10px 14px;
    border-left: 2px solid var(--db-line);
    font-size: .875rem;
    transition: color .2s ease, border-color .2s ease;
  }

  .page-about .about-toc__link:hover {
    color: var(--db-ink);
    border-left-color: var(--db-orange);
  }

  .page-about .about-chapter {
    padding-bottom: 68px;
  }

  .page-about .about-chapter + .about-chapter {
    padding-top: 58px;
  }

  .page-about .about-chapter__head {
    gap: 20px;
    margin-bottom: 26px;
  }

  .page-about .about-mission {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-mission__item:first-child {
    grid-column: auto;
  }

  .page-about .about-network {
    grid-template-columns: minmax(0, 1fr) 296px;
    gap: 30px;
    align-items: start;
  }

  .page-about .about-figure--mid {
    max-width: 720px;
  }

  .page-about .about-quality {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 30px;
    align-items: start;
  }

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

  .page-about .about-quality__item:last-child {
    grid-column: auto;
  }

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

  .page-about .about-commit {
    gap: 24px;
  }

  .page-about .about-commit__panel,
  .page-about .about-commit__card {
    padding: 30px 28px;
  }
}

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