.page-about {
  --about-rule: rgba(51, 69, 78, 0.2);
  --about-light-rule: rgba(245, 241, 232, 0.14);
  background: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--font-sans);
}

.page-about .section {
  padding-block: clamp(52px, 8vw, 100px);
}

.page-about .section--tight {
  padding-block: clamp(28px, 5vw, 52px);
}

.page-about .prose p {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--c-steel);
  max-width: 44em;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: var(--c-ink);
  color: var(--c-paper);
  padding: calc(var(--header-h) + 52px) 0 0;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -16%;
  width: min(900px, 98%);
  height: 140%;
  background: linear-gradient(148deg, var(--c-amber) 0%, var(--c-night) 56%, rgba(22, 17, 13, 0) 100%);
  clip-path: polygon(30% 0%, 100% 0%, 70% 100%, 0% 100%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--c-sand) 0%, rgba(200, 145, 47, 0) 62%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-bottom: clamp(48px, 7vw, 72px);
}

.page-about .about-hero__crumb {
  margin: 0 0 26px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-steel-lt);
}

.page-about .about-hero__crumb a {
  color: var(--c-sand-lt);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-hero__crumb a:hover {
  color: var(--c-paper);
}

.page-about .about-hero__eyebrow {
  color: var(--c-sand);
  margin: 0 0 16px;
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  max-width: 15ch;
  font-size: clamp(34px, 6.4vw, 66px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-hero__lede {
  margin: 0 0 34px;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.9;
  color: rgba(245, 241, 232, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: clamp(40px, 6vw, 60px);
}

.page-about .about-hero__marks {
  list-style: none;
  margin: 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--about-light-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
}

.page-about .about-hero__marks strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-num);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-sand-lt);
}

.page-about .about-hero__marks span {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--c-steel-lt);
}

@media (min-width: 760px) {
  .page-about .about-hero__marks {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 左窄右宽分栏 ---------- */

.page-about .about-sheet {
  display: grid;
  gap: 22px;
}

@media (min-width: 900px) {
  .page-about .about-sheet {
    grid-template-columns: minmax(150px, 196px) minmax(0, 1fr);
    gap: clamp(36px, 6vw, 84px);
    align-items: start;
  }
}

.page-about .about-note {
  display: flex;
  gap: 12px;
  align-items: baseline;
}

.page-about .about-note__num {
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-sand);
}

.page-about .about-note__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  letter-spacing: 0.02em;
  color: var(--c-steel-lt);
}

@media (min-width: 900px) {
  .page-about .about-note {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-left: 16px;
    border-left: 2px solid var(--c-sand);
  }

  .page-about .about-note__num {
    display: block;
    margin-bottom: 10px;
    font-size: 22px;
  }
}

.page-about .about-body .section-title {
  margin-top: 0;
  margin-bottom: 22px;
}

/* ---------- 品牌起点要点 ---------- */

.page-about .about-pillars {
  list-style: none;
  margin: 32px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-rule);
  display: grid;
  gap: 18px;
}

@media (min-width: 640px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .about-pillars__num {
  display: block;
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-amber);
  margin-bottom: 8px;
}

.page-about .about-pillars__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--c-steel);
  letter-spacing: 0.02em;
}

/* ---------- 三大系列 ---------- */

.page-about .about-series-head {
  max-width: 640px;
}

.page-about .about-series {
  display: grid;
  gap: 18px;
  margin-top: 36px;
}

.page-about .about-series__item {
  background: var(--c-paper);
  border: 1px solid var(--about-rule);
  border-radius: var(--r-lg);
  padding: 28px 24px 26px;
  box-shadow: var(--shadow-plate);
  transition: border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}

.page-about .about-series__item:hover {
  border-color: var(--c-sand);
  box-shadow: var(--shadow-float);
}

.page-about .about-series__index {
  display: inline-block;
  margin-bottom: 14px;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  background: var(--c-mist);
  color: var(--c-steel);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .about-series__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .about-series__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--c-steel);
}

.page-about .about-series__spec {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-rule);
  display: grid;
  gap: 9px;
  font-size: 13px;
}

.page-about .about-series__spec > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.page-about .about-series__spec dt {
  margin: 0;
  color: var(--c-steel-lt);
  letter-spacing: 0.04em;
}

.page-about .about-series__spec dd {
  margin: 0;
  color: var(--c-steel);
  font-weight: 700;
}

@media (min-width: 800px) {
  .page-about .about-series {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    padding-bottom: 62px;
  }

  .page-about .about-series__item:nth-child(2) {
    transform: translateY(31px);
  }

  .page-about .about-series__item:nth-child(3) {
    transform: translateY(62px);
  }
}

.page-about .about-series__foot {
  margin: 30px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--c-steel-lt);
  max-width: 56ch;
}

@media (min-width: 800px) {
  .page-about .about-series__foot {
    margin-top: 46px;
  }
}

/* ---------- 图片容器 ---------- */

.page-about .about-figure {
  margin: 0;
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--c-night);
}

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

.page-about .about-figure__cap {
  margin: 0;
  padding: 14px 18px 16px;
  background: var(--c-ink);
  color: rgba(245, 241, 232, 0.72);
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.03em;
}

/* ---------- 服务网络 ---------- */

.page-about .about-network__head {
  max-width: 700px;
  margin-bottom: 32px;
}

.page-about .about-network__figure {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-map-wrap {
  background: var(--c-night);
  border-radius: var(--r-lg);
  border: 1px solid var(--line-gold);
  padding: clamp(18px, 4vw, 40px);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-map {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-map line {
  stroke: rgba(200, 145, 47, 0.34);
  stroke-width: 1.2;
}

.page-about .about-map circle {
  fill: var(--c-sand);
}

.page-about .about-map .about-map__hub {
  fill: var(--c-sand-lt);
}

.page-about .about-map .about-map__halo {
  fill: none;
  stroke: rgba(235, 199, 126, 0.45);
  stroke-width: 1.5;
}

.page-about .about-map text {
  fill: rgba(245, 241, 232, 0.72);
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-about .about-map__note {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-steel-lt);
}

.page-about .about-stats__rail {
  display: flex;
  gap: 16px;
}

.page-about .about-stats__item {
  flex: 0 0 auto;
  min-width: 176px;
  padding: 20px 22px;
  border-radius: var(--r-md);
  background: var(--c-mist);
  border: 1px solid var(--about-rule);
}

.page-about .about-stats__item .stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-amber);
  margin-bottom: 8px;
}

.page-about .about-stats__item .stat__label {
  display: block;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--c-steel);
}

/* ---------- 团队与能力 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: 32px;
}

@media (min-width: 940px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(34px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-team__figure {
    margin-top: 46px;
  }
}

.page-about .about-team__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-steel);
  max-width: 46ch;
}

.page-about .about-roles {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-roles__item {
  padding: 22px 0;
  border-top: 1px solid var(--about-rule);
  display: grid;
  gap: 8px;
}

.page-about .about-roles__item:last-child {
  border-bottom: 1px solid var(--about-rule);
}

@media (min-width: 640px) {
  .page-about .about-roles__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }
}

.page-about .about-roles__tag {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-amber);
}

.page-about .about-roles__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--c-steel);
}

.page-about .about-team__cta {
  margin-top: 28px;
}

/* ---------- 资质与荣誉 ---------- */

.page-about .about-cred__head {
  max-width: 660px;
  margin-bottom: 34px;
}

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

@media (min-width: 760px) {
  .page-about .about-cred__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
  }
}

.page-about .about-cred__item {
  background: var(--c-paper);
  border: 1px solid var(--about-rule);
  border-radius: var(--r-md);
  padding: 20px 22px;
  transition: border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}

.page-about .about-cred__item:hover {
  border-color: var(--c-sand);
  box-shadow: var(--shadow-plate);
}

.page-about .about-cred__pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  background: var(--c-mist);
  border: 1px solid transparent;
  color: var(--c-steel);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .about-cred__item:hover .about-cred__pill {
  background: var(--c-sand);
  color: var(--c-ink);
}

.page-about .about-cred__desc {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-steel);
  transition: transform var(--t-base) var(--ease), color var(--t-base) var(--ease);
}

.page-about .about-cred__item:hover .about-cred__desc {
  transform: translateX(6px);
  color: var(--c-ink);
}

/* ---------- 发展历程 ---------- */

.page-about .about-timeline-head {
  max-width: 620px;
  margin-bottom: 40px;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-sand) 0%, rgba(200, 145, 47, 0.16) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px 40px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--c-paper);
  border: 2px solid var(--c-sand);
}

.page-about .about-timeline__num {
  display: block;
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-amber);
  margin-bottom: 10px;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.2vw, 23px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

.page-about .about-timeline__meta {
  margin: 0 0 10px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-steel-lt);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--c-steel);
  max-width: 52ch;
}

@media (min-width: 860px) {
  .page-about .about-timeline__item {
    padding-left: 190px;
    padding-bottom: 42px;
    min-height: 96px;
  }

  .page-about .about-timeline__num {
    position: absolute;
    left: 44px;
    top: 2px;
    margin-bottom: 0;
    font-size: 42px;
    color: var(--c-sand);
  }

  .page-about .about-timeline::before {
    left: 7px;
    bottom: 32px;
  }
}

/* ---------- 质量与质保 ---------- */

.page-about .about-warranty {
  background: var(--c-ink);
  color: var(--c-paper);
}

.page-about .about-warranty__head {
  max-width: 680px;
  margin-bottom: 40px;
}

.page-about .about-warranty__eyebrow {
  color: var(--c-sand);
  margin: 0 0 14px;
}

.page-about .about-warranty__title {
  color: var(--c-paper);
  margin-top: 0;
}

.page-about .about-warranty__lede {
  color: rgba(245, 241, 232, 0.74);
}

.page-about .about-warranty__grid {
  display: grid;
  gap: 16px;
}

@media (min-width: 820px) {
  .page-about .about-warranty__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .about-warranty__cell {
  padding: 28px 24px 30px;
  border-radius: var(--r-lg);
  background: rgba(245, 241, 232, 0.05);
  border: 1px solid var(--about-light-rule);
  transition: border-color var(--t-base) var(--ease), background var(--t-base) var(--ease);
}

.page-about .about-warranty__cell:hover {
  border-color: var(--line-gold);
  background: rgba(245, 241, 232, 0.08);
}

.page-about .about-warranty__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(40px, 5.6vw, 60px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-sand-lt);
  margin-bottom: 14px;
}

.page-about .about-warranty__cell h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-paper);
}

.page-about .about-warranty__cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.72);
}

.page-about .about-warranty__foot {
  margin: 34px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.72);
}

.page-about .about-warranty__foot a {
  color: var(--c-sand-lt);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-warranty__foot a:hover {
  color: var(--c-paper);
}

/* ---------- 手册维护 ---------- */

.page-about .about-handbook__grid {
  display: grid;
  gap: 32px;
}

@media (min-width: 900px) {
  .page-about .about-handbook__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(36px, 6vw, 84px);
    align-items: center;
  }
}

.page-about .about-handbook__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-steel);
  max-width: 46ch;
}

.page-about .about-handbook__points {
  list-style: none;
  margin: 26px 0 30px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-handbook__points li {
  padding: 7px 15px;
  border-radius: var(--r-pill);
  background: var(--c-mist);
  color: var(--c-steel);
  font-size: 13px;
  letter-spacing: 0.02em;
}

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

/* ---------- 收尾入口 ---------- */

.page-about .about-cta__bar {
  display: grid;
  gap: 26px;
  padding: clamp(26px, 5vw, 46px);
  border-radius: var(--r-lg);
  background: linear-gradient(118deg, var(--c-night) 0%, var(--c-ink) 62%, var(--c-amber) 165%);
  border: 1px solid var(--line-gold);
  color: var(--c-paper);
}

@media (min-width: 820px) {
  .page-about .about-cta__bar {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 44px;
  }
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(21px, 3vw, 32px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.76);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-series__item,
  .page-about .about-cred__desc,
  .page-about .about-cred__pill,
  .page-about .about-warranty__cell {
    transition: none;
  }
}