/* ========== 页面专属：about ========== */
.page-about {
  --about-gradient-hero: linear-gradient(142deg, var(--clr-dark) 0%, var(--clr-primary) 68%, var(--clr-primary-light) 100%);
  --about-gold-soft: rgba(212, 175, 55, 0.4);
  background: var(--clr-bg);
  overflow-x: hidden;
}

/* ── Hero区 ── */
.page-about .about-hero {
  position: relative;
  background: var(--about-gradient-hero);
  color: var(--clr-white);
  padding: 1.75rem 1.25rem 3rem;
  overflow: hidden;
}

.page-about .about-hero__deco {
  position: absolute;
  right: -10%;
  bottom: 22%;
  width: 72%;
  max-width: 640px;
  height: auto;
  opacity: .65;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 3rem;
}

.page-about .about-hero .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-hero .breadcrumb__item {
  font-family: var(--font-body);
  font-size: .875rem;
  color: rgba(255, 255, 255, 0.7);
}

.page-about .about-hero .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: .4rem;
  color: var(--clr-gold);
}

.page-about .about-hero .breadcrumb__link {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  transition: color .2s ease;
}

.page-about .about-hero .breadcrumb__link:hover {
  color: var(--clr-gold);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-heading);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--clr-gold);
  margin-bottom: .875rem;
}

.page-about .about-hero__eyebrow::before {
  content: "";
  display: inline-block;
  width: 2.5rem;
  height: 2px;
  background: var(--clr-gold);
}

.page-about .about-hero__title {
  max-width: 16em;
  font-family: var(--font-heading);
  font-size: clamp(1.85rem, 5.2vw, 3.2rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: .01em;
  margin: 0 0 1.25rem;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  max-width: 36rem;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
  margin: 0 0 2.25rem;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  width: 100%;
  max-width: 38rem;
  margin: 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

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

.page-about .about-stat__label {
  font-family: var(--font-heading);
  font-size: .75rem;
  letter-spacing: .08em;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: .35rem;
}

.page-about .about-stat__num {
  font-family: var(--font-heading);
  font-size: clamp(1.3rem, 3.4vw, 1.9rem);
  font-weight: 900;
  color: var(--clr-gold);
  margin: 0;
}

.page-about .about-stat__num em {
  font-style: normal;
  font-size: .7em;
  margin-left: .12em;
}

/* ── 章节通用标题 ── */
.page-about .about-section-label {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-heading);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--clr-primary);
  margin: 0 0 1rem;
}

.page-about .about-section-label__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--clr-gold);
}

.page-about .about-section-label::after {
  content: "";
  display: inline-block;
  width: 2.5rem;
  height: 2px;
  background: var(--clr-gold);
}

.page-about .about-section-title {
  max-width: 24ch;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--clr-primary);
  margin: 0 0 1.25rem;
}

.page-about .about-section-desc {
  max-width: 44em;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--clr-gray);
  margin: 0;
}

.page-about .about-inline-link {
  color: var(--clr-primary-light);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color .2s ease;
}

.page-about .about-inline-link:hover {
  color: var(--clr-gold);
}

/* ── 品牌故事 ── */
.page-about .about-story {
  background: var(--clr-white);
  padding: 4.5rem 1.25rem;
}

.page-about .about-story__grid {
  display: grid;
  gap: 3rem;
  max-width: var(--content-max);
  margin: 0 auto;
  align-items: center;
}

.page-about .about-letter {
  margin: 0 0 2rem;
  padding-left: 1.25rem;
  border-left: 2px solid var(--clr-gold);
}

.page-about .about-letter p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--clr-gray);
  margin: 0 0 1rem;
}

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

.page-about .about-story__media {
  position: relative;
  margin: 0;
}

.page-about .about-story__media::before {
  content: "";
  position: absolute;
  right: -0.75rem;
  bottom: -0.75rem;
  width: 62%;
  height: 42%;
  border-right: 2px solid var(--clr-gold);
  border-bottom: 2px solid var(--clr-gold);
  border-radius: 0 0 var(--radius-lg) 0;
  pointer-events: none;
}

.page-about .about-story__img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* ── 发展里程碑 ── */
.page-about .about-milestones {
  background: var(--clr-bg);
  padding: 4.5rem 1.25rem;
}

.page-about .about-milestones__head {
  max-width: var(--content-max);
  margin: 0 auto 2.5rem;
}

.page-about .about-milestones__figure {
  max-width: var(--content-max);
  margin: 0 auto 3rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

.page-about .about-timeline {
  position: relative;
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: 1.75rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--clr-gold) 0%, var(--clr-primary) 90%);
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 1.5rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 1rem;
  width: .8rem;
  height: .8rem;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--clr-white);
  border: 3px solid var(--clr-gold);
}

.page-about .about-timeline__details {
  background: var(--clr-white);
  border: 1px solid rgba(26, 58, 92, 0.08);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 1.25rem 1.5rem;
  transition: box-shadow .25s ease, border-color .25s ease;
}

.page-about .about-timeline__details[open] {
  border-color: var(--about-gold-soft);
  box-shadow: var(--shadow-md);
}

.page-about .about-timeline__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__year {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: .9375rem;
  font-weight: 700;
  color: var(--clr-primary);
  background: var(--clr-gold-light);
  border-radius: var(--radius-sm);
  padding: .15rem .5rem;
}

.page-about .about-timeline__headline {
  flex: 1 1 18rem;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-primary);
}

.page-about .about-timeline__mark {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--clr-gold);
  transition: transform .25s ease;
}

.page-about .about-timeline__details[open] .about-timeline__mark {
  transform: rotate(45deg);
}

.page-about .about-timeline__body {
  margin-top: .875rem;
  padding-top: .875rem;
  border-top: 1px solid rgba(26, 58, 92, 0.1);
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--clr-gray);
}

.page-about .about-timeline__body p {
  margin: 0;
}

/* ── 团队与文化 ── */
.page-about .about-culture {
  background: var(--clr-white);
  padding: 4.5rem 1.25rem;
}

.page-about .about-culture__grid {
  display: grid;
  gap: 3rem;
  max-width: var(--content-max);
  margin: 0 auto;
  align-items: center;
}

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

.page-about .about-culture__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.page-about .about-culture__lead {
  max-width: 42em;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--clr-gray);
  margin: 0;
}

.page-about .about-culture__list {
  display: grid;
  gap: 1.25rem;
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
}

.page-about .about-culture__list li {
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.25rem;
  border: 1px solid rgba(26, 58, 92, 0.08);
  border-radius: var(--radius-md);
  transition: transform .35s ease, box-shadow .35s ease, border-color .35s ease;
}

.page-about .about-culture__list li:hover {
  transform: rotateX(3deg) translateY(-4px);
  border-color: var(--clr-gold);
  box-shadow: var(--shadow-md);
}

.page-about .about-culture__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 58% 42% 55% 45%;
  background: var(--clr-primary);
  color: var(--clr-gold-light);
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 700;
}

.page-about .about-culture__list h3 {
  font-family: var(--font-heading);
  font-size: 1.075rem;
  font-weight: 700;
  color: var(--clr-primary);
  margin: 0 0 .4rem;
}

.page-about .about-culture__list p {
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--clr-gray);
  margin: 0;
}

/* ── 资质与认证 ── */
.page-about .about-credentials {
  background: var(--clr-bg);
  padding: 4.5rem 1.25rem;
}

.page-about .about-credentials__intro {
  max-width: var(--content-max);
  margin: 0 auto 3rem;
}

.page-about .about-credentials__grid {
  display: grid;
  gap: 1.5rem;
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-cert-card {
  position: relative;
  background: var(--clr-white);
  border: 1px solid rgba(26, 58, 92, 0.08);
  border-radius: var(--radius-md);
  padding: 2rem 1.5rem 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .25s ease, transform .25s ease;
}

.page-about .about-cert-card::before {
  content: "";
  position: absolute;
  left: 1.5rem;
  right: 1.5rem;
  top: 0;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(90deg, var(--clr-gold) 0%, var(--clr-gold-light) 100%);
}

.page-about .about-cert-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.page-about .about-cert-card__badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: var(--clr-primary);
  color: var(--clr-gold);
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.page-about .about-cert-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-primary);
  margin: 0 0 .75rem;
}

.page-about .about-cert-card p {
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--clr-gray);
  margin: 0;
}

.page-about .about-credentials__note {
  max-width: var(--content-max);
  margin: 2rem auto 0;
  padding: 1rem 1.25rem;
  background: var(--clr-white);
  border-left: 3px solid var(--clr-gold);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--clr-gray);
}

.page-about .about-credentials__note a {
  color: var(--clr-primary-light);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ── 甘肃文化基因 ── */
.page-about .about-heritage {
  background: linear-gradient(180deg, var(--clr-bg) 0%, var(--clr-white) 100%);
  padding: 4.5rem 1.25rem;
}

.page-about .about-heritage__inner {
  display: grid;
  gap: 3rem;
  max-width: var(--content-max);
  margin: 0 auto;
  align-items: center;
}

.page-about .about-heritage__text {
  max-width: 40em;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--clr-gray);
  margin: 0 0 2rem;
}

.page-about .about-heritage__items {
  display: grid;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-heritage__items li {
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(26, 58, 92, 0.1);
}

.page-about .about-heritage__items li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-heritage__items h3 {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-heading);
  font-size: 1.075rem;
  font-weight: 700;
  color: var(--clr-primary);
  margin: 0 0 .5rem;
}

.page-about .about-heritage__items h3::before {
  content: "";
  width: .5rem;
  height: .5rem;
  transform: rotate(45deg);
  background: var(--clr-gold);
  flex-shrink: 0;
}

.page-about .about-heritage__items p {
  padding-left: 1.1rem;
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--clr-gray);
  margin: 0;
}

.page-about .about-heritage__svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 320px;
}

.page-about .about-heritage__svg path:nth-child(1) {
  fill: none;
  stroke: var(--clr-gold);
  stroke-width: 4;
}

.page-about .about-heritage__svg path:nth-child(2) {
  fill: none;
  stroke: var(--clr-primary);
  stroke-width: 2;
  opacity: .6;
}

.page-about .about-heritage__svg path:nth-child(3) {
  fill: none;
  stroke: var(--clr-gold-light);
  stroke-width: 6;
  opacity: .5;
}

.page-about .about-heritage__svg circle {
  fill: var(--clr-gold);
}

/* ── 结尾引导区 ── */
.page-about .about-epilogue {
  background: var(--clr-dark);
  color: var(--clr-white);
  padding: 4rem 1.25rem;
}

.page-about .about-epilogue__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  text-align: center;
}

.page-about .about-epilogue__title {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3.6vw, 2.1rem);
  font-weight: 800;
  color: var(--clr-white);
  margin: 0 0 1rem;
}

.page-about .about-epilogue__text {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
  margin: 0 0 2.25rem;
}

.page-about .about-epilogue__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.page-about .about-epilogue__actions .btn--outline {
  border-color: rgba(255, 255, 255, 0.65);
  color: var(--clr-white);
}

.page-about .about-epilogue__actions .btn--outline:hover {
  border-color: var(--clr-gold);
  color: var(--clr-gold);
}

/* ── 桌面端布局 ── */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 2.25rem 2rem 4rem;
  }

  .page-about .about-story,
  .page-about .about-milestones,
  .page-about .about-culture,
  .page-about .about-credentials,
  .page-about .about-heritage {
    padding: 5.5rem 2rem;
  }

  .page-about .about-credentials__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 2.5rem 2rem 4.5rem;
  }

  .page-about .about-story,
  .page-about .about-milestones,
  .page-about .about-culture,
  .page-about .about-credentials,
  .page-about .about-heritage {
    padding: 6.5rem 2rem;
  }

  .page-about .about-story__grid {
    grid-template-columns: 7fr 5fr;
    gap: 4.5rem;
  }

  .page-about .about-culture__grid {
    grid-template-columns: 5fr 7fr;
    gap: 4.5rem;
  }

  .page-about .about-heritage__inner {
    grid-template-columns: 1fr 1fr;
    gap: 4.5rem;
  }

  .page-about .about-epilogue {
    padding: 5rem 2rem;
  }

  .page-about .about-timeline {
    padding-left: 0;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .about-timeline__item {
    width: calc(50% - 2.5rem);
    margin-left: 0;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-timeline__item::before {
    left: auto;
    right: -2rem;
  }

  .page-about .about-timeline__item:nth-child(even)::before {
    right: auto;
    left: -2rem;
  }

  .page-about .about-timeline__body {
    font-size: .9375rem;
  }
}

/* ── 弱动画支持 ── */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero .breadcrumb__link,
  .page-about .about-timeline__details,
  .page-about .about-timeline__mark,
  .page-about .about-culture__list li,
  .page-about .about-cert-card,
  .page-about .about-epilogue__actions .btn--outline {
    transition: none;
  }
}