.page-about {
  --about-rail: 180px;
  overflow-x: clip;
}

/* 面包屑 */
.page-about .crumbs {
  padding: 18px 0 6px;
}
.page-about .crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}
.page-about .crumbs-link {
  color: var(--gold-light);
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-about .crumbs-link:hover,
.page-about .crumbs-link:focus-visible {
  color: var(--gold);
}
.page-about .crumbs-sep,
.page-about .crumbs-current {
  color: var(--haze);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: 20px 0 72px;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(122, 21, 36, 0.55) 0%, transparent 55%),
    radial-gradient(90% 70% at 0% 100%, rgba(46, 139, 135, 0.16) 0%, transparent 60%),
    linear-gradient(168deg, #170b0f 0%, #0b0b0e 68%);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(135deg, transparent 0 18px, rgba(214, 168, 75, 0.045) 18px 19px);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -90px;
  top: -70px;
  width: 380px;
  height: 380px;
  border: 1px solid rgba(214, 168, 75, 0.18);
  border-radius: 50%;
  pointer-events: none;
}
.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: center;
}
@media (min-width: 880px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 52px;
  }
}
.page-about .about-cover {
  position: relative;
  margin: 0;
  width: 100%;
  max-width: 400px;
  aspect-ratio: 4 / 5;
  justify-self: center;
  border: 1px solid var(--edge);
  background: var(--obsidian);
  box-shadow:
    0 0 0 1px rgba(11, 11, 14, 0.9),
    0 0 0 7px rgba(90, 15, 26, 0.55),
    22px 26px 0 -6px rgba(122, 21, 36, 0.35);
  overflow: hidden;
}
@media (min-width: 880px) {
  .page-about .about-cover {
    justify-self: start;
    max-width: 380px;
  }
}
.page-about .about-cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .about-cover figcaption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 5px 11px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--gold-light);
  background: rgba(11, 11, 14, 0.78);
  border: 1px solid var(--edge);
}
.page-about .about-hero-copy .eyebrow {
  margin: 0;
  font-size: 0.76rem;
  letter-spacing: 0.28em;
  color: var(--gold);
}
.page-about .about-hero h1 {
  margin: 12px 0 18px;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 6.2vw, 3.35rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: #ffffff;
  text-wrap: balance;
}
.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--gold);
  text-shadow: 0 0 28px rgba(214, 168, 75, 0.4);
}
.page-about .about-hero .lede {
  margin: 0;
  max-width: 48ch;
  font-size: 1.02rem;
  line-height: 1.85;
  color: rgba(242, 233, 216, 0.82);
}
.page-about .about-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 30px;
  margin: 28px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--edge-soft);
}
.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .about-stats .num {
  font-family: var(--font-mono);
  font-size: 1.32rem;
  letter-spacing: 0.02em;
  color: var(--gold-light);
  text-shadow: 0 0 14px rgba(240, 211, 138, 0.3);
}
.page-about .about-stats .label {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--haze);
}

/* 主体双栏 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 8px;
  padding-bottom: 80px;
}
@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
  }
}

/* 左侧索引 */
.page-about .about-index {
  align-self: start;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px 14px;
  padding: 14px 16px;
  background: linear-gradient(170deg, rgba(90, 15, 26, 0.92), rgba(11, 11, 14, 0.96));
  border: 1px solid var(--edge-soft);
  border-top: 2px solid var(--gold);
}
@media (min-width: 960px) {
  .page-about .about-index {
    grid-template-columns: minmax(0, 1fr);
    position: sticky;
    top: calc(var(--header-h) + 20px);
    padding: 24px 18px;
  }
}
.page-about .about-seal {
  width: 52px;
  height: 52px;
  display: grid;
  place-content: center;
  font-family: var(--font-serif);
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: #f7e8c0;
  text-align: center;
  background: radial-gradient(circle at 32% 28%, #a01e31 0%, #7a1524 55%, #5a0f1a 100%);
  border: 2px solid var(--gold);
  border-radius: 6px;
  box-shadow:
    inset 0 0 0 2px rgba(11, 11, 14, 0.5),
    0 4px 12px rgba(0, 0, 0, 0.5);
}
.page-about .about-seal span {
  display: block;
}
.page-about .about-index-label {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  color: var(--gold-light);
}
@media (min-width: 960px) {
  .page-about .about-index-label {
    padding-bottom: 12px;
    border-bottom: 1px solid var(--edge-soft);
  }
}
.page-about .toc {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  grid-column: 1 / -1;
  margin-top: 4px;
}
@media (min-width: 960px) {
  .page-about .toc {
    display: block;
    grid-column: auto;
    margin-top: 8px;
  }
}
.page-about .toc-link {
  display: block;
  padding: 6px 10px;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: rgba(242, 233, 216, 0.78);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.page-about .toc-link:hover {
  color: var(--gold-light);
  background: rgba(214, 168, 75, 0.08);
}
.page-about .toc-link[aria-current="true"] {
  color: var(--gold);
  border-left-color: var(--gold);
  background: rgba(214, 168, 75, 0.12);
}
@media (max-width: 959px) {
  .page-about .toc-link {
    border-left: 0;
    border: 1px solid var(--edge-soft);
    border-radius: 999px;
  }
  .page-about .toc-link[aria-current="true"] {
    border-color: var(--gold);
    background: rgba(214, 168, 75, 0.16);
  }
}
.page-about .toc-link:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: 4px;
}

/* 内容流 */
.page-about .about-content {
  display: flex;
  flex-direction: column;
  gap: 40px;
  min-width: 0;
}
.page-about .about-sec {
  position: relative;
  scroll-margin-top: calc(var(--header-h) + 28px);
  padding: 34px 22px 36px;
  color: var(--paper-ink);
  background: var(--paper);
  border: 1px solid rgba(90, 15, 26, 0.18);
  box-shadow:
    0 1px 0 rgba(214, 168, 75, 0.4),
    10px 12px 0 -2px rgba(90, 15, 26, 0.22);
}
.page-about .about-sec::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(214, 168, 75, 0) 70%);
}
.page-about .about-sec--dark {
  color: var(--paper);
  background:
    radial-gradient(90% 80% at 100% 0%, rgba(46, 139, 135, 0.14) 0%, transparent 60%),
    linear-gradient(165deg, #150a10 0%, #0b0b0e 70%);
  border-color: var(--edge-soft);
  box-shadow:
    0 1px 0 rgba(214, 168, 75, 0.28),
    10px 12px 0 -2px rgba(0, 0, 0, 0.55);
}
.page-about .about-sec--dark::before {
  background: linear-gradient(90deg, var(--teal) 0%, rgba(46, 139, 135, 0) 70%);
}
@media (min-width: 720px) {
  .page-about .about-sec {
    padding: 44px 38px 46px;
  }
}
.page-about .about-sec .eyebrow {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--wine);
}
.page-about .about-sec--dark .eyebrow {
  color: var(--cyan);
}
.page-about .about-sec h2 {
  margin: 10px 0 18px;
  font-family: var(--font-serif);
  font-size: clamp(1.42rem, 3.2vw, 2rem);
  line-height: 1.28;
  color: var(--paper-ink);
  text-wrap: balance;
}
.page-about .about-sec--dark h2 {
  color: #ffffff;
}
.page-about .about-sec .prose {
  max-width: 64ch;
  font-size: 0.97rem;
  line-height: 1.9;
}
.page-about .about-sec .prose p {
  margin: 0 0 1em;
  color: rgba(42, 10, 16, 0.82);
}
.page-about .about-sec .prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-sec--dark .prose p {
  color: rgba(242, 233, 216, 0.82);
}

/* 四条内容线 */
.page-about .flow-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 22px;
}
@media (min-width: 560px) {
  .page-about .flow-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .flow-item {
  position: relative;
  padding: 20px 18px 20px 20px;
  background: rgba(242, 233, 216, 0.05);
  border-left: 3px solid var(--gold);
  transition: transform 0.25s ease, background 0.25s ease;
}
.page-about .flow-item:hover,
.page-about .flow-item:focus-within {
  transform: translateY(-3px);
  background: rgba(242, 233, 216, 0.1);
}
.page-about .flow-item h3 {
  margin: 10px 0 8px;
  font-family: var(--font-serif);
  font-size: 1.06rem;
  color: #ffffff;
}
.page-about .flow-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(242, 233, 216, 0.76);
}

/* 里程碑 */
.page-about .milestone-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  align-items: center;
}
@media (min-width: 660px) {
  .page-about .milestone-head {
    grid-template-columns: minmax(0, 1fr) 132px;
  }
}
.page-about .milestone-badge {
  width: 132px;
  height: 132px;
  margin: 0;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--gold);
  box-shadow:
    inset 0 0 0 4px rgba(11, 11, 14, 0.6),
    0 0 24px rgba(214, 168, 75, 0.28);
  justify-self: start;
}
@media (min-width: 660px) {
  .page-about .milestone-badge {
    justify-self: end;
  }
}
.page-about .milestone-badge img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .timeline {
  display: flex;
  flex-direction: column;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}
.page-about .timeline li {
  display: grid;
  grid-template-columns: 54px 30px minmax(0, 1fr);
  align-items: start;
  padding: 14px 0;
  transition: transform 0.25s ease;
}
@media (min-width: 560px) {
  .page-about .timeline li {
    grid-template-columns: 68px 34px minmax(0, 1fr);
  }
}
.page-about .timeline li:hover,
.page-about .timeline li:focus-within {
  transform: translateX(4px);
}
.page-about .year {
  padding: 3px 6px 0 0;
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--gold-light);
  text-align: right;
  text-shadow: 0 0 10px rgba(240, 211, 138, 0.28);
}
.page-about .line-cell {
  position: relative;
  display: block;
  align-self: stretch;
  min-height: 28px;
}
.page-about .line-cell::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -14px;
  bottom: -14px;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(214, 168, 75, 0.45), rgba(122, 21, 36, 0.4));
}
.page-about .timeline li:first-child .line-cell::before {
  top: 8px;
}
.page-about .timeline li:last-child .line-cell::before {
  bottom: calc(100% - 20px);
}
.page-about .line-cell::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 8px;
  width: 11px;
  height: 11px;
  margin-left: -5.5px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--gold);
  box-shadow: 0 0 10px rgba(214, 168, 75, 0.55);
}
.page-about .timeline li:hover .line-cell::after {
  background: var(--gold);
  box-shadow: 0 0 16px rgba(240, 211, 138, 0.8);
}
.page-about .event h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 1.06rem;
  color: #ffffff;
}
.page-about .event p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: rgba(242, 233, 216, 0.75);
}

/* 团队 */
.page-about .team-photo {
  margin: 24px 0 0;
  overflow: hidden;
  border: 1px solid rgba(90, 15, 26, 0.24);
  box-shadow: 0 8px 0 -3px rgba(90, 15, 26, 0.18);
}
.page-about .team-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 24px;
}
@media (min-width: 560px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .team-item {
  padding: 18px;
  background: rgba(255, 255, 255, 0.58);
  border-top: 3px solid var(--wine);
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.page-about .team-item:hover,
.page-about .team-item:focus-within {
  transform: translateY(-3px);
  border-top-color: var(--gold);
}
.page-about .team-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 1.02rem;
  color: var(--paper-ink);
}
.page-about .team-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: rgba(42, 10, 16, 0.78);
}
.page-about .process-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 24px;
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--wine);
  background: rgba(90, 15, 26, 0.08);
  border: 1px dashed rgba(122, 21, 36, 0.35);
}
.page-about .process-step b {
  margin-right: 4px;
  font-weight: 700;
  color: var(--gold);
}
.page-about .process-arrow {
  color: var(--haze);
}

/* 合作生态 */
.page-about .partner-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 22px;
}
@media (min-width: 620px) {
  .page-about .partner-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .partner-cols h3 {
  margin: 0 0 10px;
  padding-bottom: 8px;
  font-family: var(--font-serif);
  font-size: 1.02rem;
  color: var(--gold-light);
  border-bottom: 1px solid var(--edge-soft);
}
.page-about .partner-cols ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .partner-cols li {
  position: relative;
  padding-left: 16px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(242, 233, 216, 0.78);
}
.page-about .partner-cols li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 1px;
  background: var(--gold);
}
.page-about .partner-cols li b {
  font-weight: 600;
  color: var(--paper);
}

/* 承诺与入口 */
.page-about .promise-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}
.page-about .prose .mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.01em;
  color: var(--wine);
  padding: 1px 5px;
  background: rgba(90, 15, 26, 0.08);
  border-radius: 3px;
}
@media (prefers-reduced-motion: reduce) {
  .page-about .flow-item,
  .page-about .team-item,
  .page-about .timeline li {
    transition: none;
  }
  .page-about .flow-item:hover,
  .page-about .team-item:hover,
  .page-about .timeline li:hover {
    transform: none;
  }
}