.page-about {
  background: var(--paper);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(20px, 3.6vw, 44px) clamp(24px, 4.4vw, 56px);
  background:
    radial-gradient(130% 100% at 90% -20%, rgba(201, 162, 39, 0.2), transparent 62%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(15, 61, 46, 0.05) 0 1px, transparent 1px 30px);
  pointer-events: none;
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(14px, 2.4vw, 22px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.page-about .about-hero .breadcrumb a {
  color: var(--ink-green);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--cinnabar);
}

.page-about .about-hero__frame {
  padding: clamp(22px, 3.4vw, 44px);
  background: linear-gradient(180deg, rgba(247, 244, 236, 0.97), rgba(239, 233, 221, 0.86));
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.28;
  letter-spacing: 0.03em;
  color: var(--ink-green);
  max-width: 22ch;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-about .about-hero__fact {
  background: rgba(247, 244, 236, 0.9);
  padding: 14px 16px;
  margin: 0;
}

.page-about .about-hero__fact-k {
  display: block;
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--rock);
}

.page-about .about-hero__fact-v {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--ink-green);
}

/* ---------- 布局与侧栏索引 ---------- */
.page-about .about-body {
  padding-block: clamp(30px, 5vw, 68px);
}

.page-about .about-rail {
  position: sticky;
  top: 92px;
  align-self: start;
}

.page-about .about-rail-nav .rail-nav__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--rock);
}

.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-left: 1px solid var(--line);
}

.page-about .about-rail-list .rail-nav__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-soft);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-rail-list .rail-nav__link:hover {
  color: var(--ink-green);
  background: rgba(201, 162, 39, 0.09);
}

.page-about .about-rail-list .rail-nav__link[aria-current="true"] {
  color: var(--ink-green);
  border-left-color: var(--gold);
  background: rgba(201, 162, 39, 0.12);
  font-weight: 600;
}

.page-about .about-rail-list .rail-nav__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec + .about-sec {
  margin-top: clamp(40px, 7vw, 84px);
}

.page-about .about-sec__body--narrow {
  max-width: 64ch;
}

.page-about .about-sec__body p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-sec__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-link {
  display: inline-block;
  font-size: 14px;
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid rgba(192, 57, 43, 0.4);
  transition: border-color 0.25s ease, color 0.25s ease;
}

.page-about .about-link:hover {
  color: var(--ink-green);
  border-bottom-color: var(--ink-green);
}

/* ---------- 01 品牌缘起 ---------- */
.page-about .about-origin__fig {
  margin: clamp(24px, 3.6vw, 38px) 0;
}

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

.page-about .about-origin__point {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 14px;
  padding: 14px 16px;
  background: var(--paper-2);
  border-left: 3px solid var(--gold);
}

.page-about .about-origin__point p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 02 服务对象 ---------- */
.page-about .about-filter {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
}

.page-about .about-people {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(268px, 1fr));
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-person {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid var(--line);
  transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
}

.page-about .about-person:hover {
  transform: translateY(-3px);
  border-color: var(--gold);
  box-shadow: var(--shadow-soft);
}

.page-about .about-person .card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.45;
  color: var(--ink-green);
}

.page-about .about-person .card__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
  flex: 1 1 auto;
}

.page-about .about-person .card__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-about .about-person .card__meta {
  margin: 0;
}

/* ---------- 03 内容体系 ---------- */
.page-about .about-system {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-system__fig {
  margin: 0;
}

.page-about .about-navcols {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-navcol {
  background: var(--paper);
  padding: 16px 18px;
  transition: background 0.25s ease;
}

.page-about .about-navcol:hover {
  background: var(--paper-2);
}

.page-about .about-navcol__no {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-navcol__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--ink-green);
}

.page-about .about-navcol__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .about-topics {
  margin-top: clamp(22px, 3vw, 34px);
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--paper-2);
  border: 1px solid var(--line-gold);
}

.page-about .about-topics__lead {
  margin: 0 0 16px;
  max-width: 70ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-topics__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 04 结构升级历程 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: clamp(16px, 2.2vw, 24px) 0;
  border-bottom: 1px dashed var(--line);
  transition: transform 0.3s ease;
}

.page-about .about-timeline__item:hover {
  transform: translateY(-2px);
}

.page-about .about-timeline__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--rock);
  padding-top: 3px;
  transition: color 0.3s ease;
}

.page-about .about-timeline__item:hover .about-timeline__no {
  color: var(--gold);
}

.page-about .about-timeline__body {
  border-left: 2px solid var(--line);
  padding-left: 16px;
  transition: border-color 0.3s ease;
}

.page-about .about-timeline__item:hover .about-timeline__body {
  border-left-color: var(--gold);
}

.page-about .about-timeline__when {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--clay);
  text-transform: uppercase;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(17px, 1.9vw, 20px);
  letter-spacing: 0.03em;
  color: var(--ink-green);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-timeline__more {
  margin: 20px 0 0;
}

/* ---------- 05 服务支持 ---------- */
.page-about .about-support {
  display: grid;
  gap: clamp(18px, 2.8vw, 30px);
  align-items: start;
}

.page-about .about-support__panel {
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--ink-green);
}

.page-about .about-support__name {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--ink-green);
}

.page-about .about-support__list {
  margin: 0;
}

.page-about .about-support__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-support__row:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-support__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--rock);
}

.page-about .about-support__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-support__row dd .mono {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--ink-green);
}

.page-about .about-support__fig {
  margin: 0;
}

.page-about .about-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 06 长期运营承诺 ---------- */
.page-about .about-commit {
  position: relative;
  margin-top: clamp(40px, 7vw, 80px);
  padding-block: clamp(34px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(201, 162, 39, 0.24), transparent 58%),
    linear-gradient(180deg, var(--ink-green) 0%, var(--ink-green-deep) 100%);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-commit::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(247, 244, 236, 0.07) 0 1px, transparent 1px 26px);
  pointer-events: none;
}

.page-about .about-commit__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-commit__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold-light);
}

.page-about .about-commit__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.3;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-commit__text {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(247, 244, 236, 0.82);
}

.page-about .about-commit__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1px;
  background: rgba(247, 244, 236, 0.18);
  border: 1px solid rgba(247, 244, 236, 0.18);
}

.page-about .about-commit__item {
  background: rgba(10, 42, 31, 0.86);
  padding: 18px;
}

.page-about .about-commit__no {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold-light);
}

.page-about .about-commit__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 244, 236, 0.86);
}

.page-about .about-commit__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 34px);
}

.page-about .about-commit__actions .btn--ghost {
  color: var(--paper);
  border-color: rgba(247, 244, 236, 0.5);
}

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-system {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-support {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (max-width: 960px) {
  .page-about .about-rail {
    position: static;
    margin-bottom: clamp(20px, 3vw, 30px);
  }

  .page-about .about-rail-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    border-left: 0;
    border-bottom: 1px solid var(--line);
    -webkit-overflow-scrolling: touch;
  }

  .page-about .about-rail-list > li {
    flex: 0 0 auto;
  }

  .page-about .about-rail-list .rail-nav__link {
    white-space: nowrap;
    border-left: 0;
    border-bottom: 2px solid transparent;
  }

  .page-about .about-rail-list .rail-nav__link[aria-current="true"] {
    border-left-color: transparent;
    border-bottom-color: var(--gold);
  }
}

@media (max-width: 640px) {
  .page-about .about-hero__frame {
    padding: 18px 16px;
  }

  .page-about .about-hero__title {
    max-width: none;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 32px 1fr;
    gap: 10px;
  }

  .page-about .about-timeline__body {
    padding-left: 12px;
  }

  .page-about .about-support__actions .btn,
  .page-about .about-commit__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}