.page-about {
  --about-line: rgba(36, 64, 90, 0.72);
  --about-line-soft: rgba(36, 64, 90, 0.42);
  --about-text: #D3DDE6;
  --about-text-dim: #9AAAB6;
  background: var(--ink-900);
  color: var(--paper-050);
}

.page-about h1,
.page-about h2,
.page-about h3,
.page-about p,
.page-about dl,
.page-about dd,
.page-about blockquote,
.page-about figure,
.page-about ol,
.page-about ul {
  margin: 0;
}

.page-about p {
  color: var(--about-text);
  font-size: 16px;
  line-height: 1.85;
}

.page-about p + p {
  margin-top: 18px;
}

.page-about a {
  color: inherit;
}

.page-about .breadcrumb {
  padding-top: 18px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(24px, 4vw, 52px) 0 0;
}

.page-about .about-hero__grid {
  row-gap: 34px;
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.2vw, 60px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 16px 0 20px;
  color: var(--paper-050);
  max-width: 15em;
}

.page-about .about-hero__lede {
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
  align-content: start;
}

.page-about .about-figure {
  background: var(--ink-700);
  padding: 16px 18px 18px;
}

.page-about .about-figure__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone-400);
  margin-bottom: 8px;
}

.page-about .about-figure__value {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper-050);
  line-height: 1.4;
}

.page-about .about-figure__value .mono {
  font-size: 22px;
  color: var(--copper-300);
  letter-spacing: -0.01em;
}

.page-about .about-banner {
  margin-top: clamp(34px, 5vw, 64px);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 460px;
  object-fit: cover;
}

/* ---------- 章节导航 ---------- */

.page-about .about-index {
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  margin-top: clamp(34px, 5vw, 64px);
}

.page-about .about-index__list {
  display: flex;
  gap: 28px;
  list-style: none;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 15px 0 13px;
  border-bottom: 2px solid transparent;
  font-size: 14px;
  color: var(--stone-400);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .about-index__link .mono {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-500);
  transition: color var(--dur-fast) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper-050);
  border-bottom-color: var(--copper-500);
}

.page-about .about-index__link:hover .mono,
.page-about .about-index__link:focus-visible .mono {
  color: var(--copper-300);
}

/* ---------- 章节通用 ---------- */

.page-about .about-chapter {
  padding: clamp(46px, 6.5vw, 92px) 0;
  scroll-margin-top: 120px;
}

.page-about .about-chapter--band {
  background: var(--ink-700);
}

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

.page-about .about-chapter__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--copper-500);
  margin-bottom: 10px;
}

.page-about .about-chapter__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(22px, 2.5vw, 33px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--paper-050);
}

.page-about .about-chapter__body {
  max-width: 44em;
}

.page-about .about-chapter__lead {
  color: var(--paper-050);
  font-size: 17px;
}

.page-about .about-link {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 199, 196, 0.45);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--copper-300);
  border-bottom-color: var(--copper-300);
}

/* ---------- 服务对象 ---------- */

.page-about .about-audience {
  margin-top: 26px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-audience__item {
  padding: 24px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-audience__name {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--paper-050);
  margin-bottom: 10px;
}

.page-about .about-audience__name::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 2px;
  background: var(--copper-500);
  vertical-align: 6px;
  margin-right: 12px;
}

.page-about .about-audience__text {
  font-size: 15.5px;
}

.page-about .about-audience__note {
  margin-top: 12px;
  font-size: 12.5px;
  color: var(--about-text-dim);
  letter-spacing: 0.02em;
}

/* ---------- 引文块 ---------- */

.page-about .about-quote {
  margin: 30px 0;
  padding: 20px 0 20px 22px;
  border-left: 3px solid var(--copper-500);
  background: linear-gradient(90deg, rgba(200, 149, 47, 0.08), rgba(200, 149, 47, 0));
}

.page-about .about-quote__text {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.8;
  color: var(--copper-300);
}

.page-about .about-quote__copy {
  margin-top: 16px;
}

/* ---------- 发展历程 ---------- */

.page-about .about-history__grid {
  display: grid;
  gap: 36px;
  margin-top: 34px;
}

.page-about .about-history__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: cover;
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 24px;
  width: 2px;
  background: linear-gradient(180deg, var(--copper-500), rgba(200, 149, 47, 0.08));
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 30px 30px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--copper-500);
  background: var(--ink-900);
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .about-chapter--band .about-tl__item::before {
  background: var(--ink-700);
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus-within::before {
  background: var(--copper-300);
  border-color: var(--copper-300);
}

.page-about .about-tl__year {
  display: block;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--copper-500);
  margin-bottom: 6px;
}

.page-about .about-tl__title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--paper-050);
  margin-bottom: 8px;
}

.page-about .about-tl__text {
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-tl__tag {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--about-text-dim);
  border: 1px solid var(--about-line);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .about-tl__item:hover .about-tl__tag,
.page-about .about-tl__item:focus-within .about-tl__tag {
  color: var(--copper-300);
  border-color: var(--copper-300);
}

/* ---------- 团队与培训 ---------- */

.page-about .about-team__list {
  list-style: none;
  padding: 0;
  margin: 24px 0 4px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-team__level {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan-400);
}

.page-about .about-team__item p {
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 区域合作 ---------- */

.page-about .about-region__figure {
  margin-top: 34px;
}

.page-about .about-region__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
}

.page-about .about-region__figure .media-frame__caption {
  color: var(--about-text-dim);
  font-size: 12.5px;
  margin-top: 12px;
}

.page-about .about-region__list {
  list-style: none;
  padding: 0;
  margin-top: 38px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-region__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line);
  transition: background var(--dur-fast) var(--ease);
}

.page-about .about-region__item:hover {
  background: rgba(200, 149, 47, 0.06);
}

.page-about .about-region__code {
  font-size: 15px;
  color: var(--copper-500);
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.page-about .about-region__name {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 16px;
  color: var(--paper-050);
  margin-bottom: 6px;
}

.page-about .about-region__item p {
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .about-region__note {
  margin-top: 30px;
  padding: 22px 22px 24px;
  border: 1px solid rgba(226, 112, 58, 0.4);
  background: linear-gradient(180deg, rgba(226, 112, 58, 0.09), rgba(226, 112, 58, 0.02));
}

.page-about .about-region__note p {
  font-size: 15px;
}

/* ---------- 结尾 ---------- */

.page-about .about-close {
  padding: clamp(46px, 6vw, 82px) 0 clamp(56px, 7vw, 96px);
}

.page-about .about-close__panel {
  border-top: 1px solid var(--copper-500);
  padding-top: 28px;
  display: grid;
  gap: 26px;
}

.page-about .about-close__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.32;
  color: var(--paper-050);
  margin-bottom: 14px;
}

.page-about .about-close__text p {
  max-width: 42em;
  font-size: 15.5px;
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-team__item {
    grid-template-columns: 120px 1fr;
    gap: 22px;
    align-items: baseline;
  }

  .page-about .about-region__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-about .about-close__panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 36px;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter__inner {
    grid-template-columns: minmax(170px, 3fr) minmax(0, 8fr);
    gap: 56px;
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 56px;
    margin-top: 46px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__grid {
    align-items: start;
  }

  .page-about .about-region__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-link,
  .page-about .about-tl__item::before,
  .page-about .about-tl__tag,
  .page-about .about-region__item {
    transition: none;
  }
}