.page-about {
  --about-gold-line: rgba(242, 178, 62, 0.55);
  --about-hair: rgba(46, 60, 120, 0.85);
  --about-paper-soft: rgba(244, 241, 232, 0.86);
  background: var(--indigo-950);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-sans);
  font-weight: 700;
}

/* 面包屑 */
.page-about .about-crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-crumbs a {
  color: var(--muted);
  text-decoration: none;
}

.page-about .about-crumbs a:hover {
  color: var(--gold-300);
}

.page-about .about-crumbs__sep {
  color: var(--line);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--gold-500);
}

/* 通用区块标题组 */
.page-about .about-sec-head {
  position: relative;
  max-width: 62ch;
  margin-bottom: clamp(26px, 4vw, 46px);
  padding-top: 8px;
}

.page-about .about-sec-no {
  position: absolute;
  top: -26px;
  left: -4px;
  z-index: 0;
  font-family: var(--font-mono);
  font-size: clamp(64px, 13vw, 120px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--indigo-800);
  opacity: 0.6;
  pointer-events: none;
  user-select: none;
}

.page-about .about-sec-head > *:not(.about-sec-no) {
  position: relative;
  z-index: 1;
}

.page-about .about-sec-head h2 {
  margin: 10px 0 14px;
  font-size: clamp(1.5rem, 3.3vw, 2.35rem);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-sec-head__lede {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* 通用图片容器 */
.page-about .figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--indigo-800);
}

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

/* 01 开篇 */
.page-about .about-lead {
  position: relative;
  padding: clamp(30px, 5vw, 64px) 0 clamp(48px, 7vw, 92px);
}

.page-about .about-lead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(46, 60, 120, 0.4) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(0deg, rgba(46, 60, 120, 0.26) 0 1px, transparent 1px 24px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
}

.page-about .about-lead__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
}

.page-about .about-lead__title {
  margin: 14px 0 22px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2.1rem, 5.6vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-lead__title::first-line {
  color: var(--gold-300);
}

.page-about .about-lead__lede {
  padding-left: 16px;
  border-left: 2px solid var(--gold-500);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.8;
  color: var(--about-paper-soft);
}

.page-about .about-lead__body {
  margin-top: 20px;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--muted);
}

.page-about .about-lead__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-lead__side {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-lead__figure {
  aspect-ratio: 3 / 4;
}

.page-about .about-plates {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-plate {
  position: relative;
  display: grid;
  gap: 2px;
  padding: 14px 16px 16px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 4px 4px 0 rgba(46, 60, 120, 0.6);
}

.page-about .about-plate__no {
  position: absolute;
  top: 10px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: rgba(10, 14, 31, 0.4);
}

.page-about .about-plate__num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-about .about-plate__unit {
  margin-left: 4px;
  font-size: 0.46em;
  color: rgba(10, 14, 31, 0.55);
}

.page-about .about-plate__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(10, 14, 31, 0.55);
}

.page-about .about-plate__note {
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.62;
  color: rgba(10, 14, 31, 0.74);
}

/* 02 版本脉络 */
.page-about .about-versions {
  padding: clamp(48px, 7vw, 88px) 0;
  background: var(--indigo-900);
  border-top: var(--border);
  border-bottom: var(--border);
}

.page-about .about-versions__rail {
  list-style: none;
  margin: 0;
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-padding-left: var(--gutter);
  padding: 10px var(--gutter) 20px;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: var(--line) transparent;
  scrollbar-width: thin;
}

.page-about .about-versions__rail::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-versions__rail::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 999px;
}

.page-about .about-vcard {
  position: relative;
  flex: 0 0 min(78vw, 320px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 20px 26px;
  background: var(--indigo-950);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-vcard::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--about-gold-line);
}

.page-about .about-vcard::after {
  content: "";
  position: absolute;
  top: -5px;
  left: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 0 0 4px var(--indigo-900);
}

.page-about .about-vcard--current {
  background: var(--indigo-800);
  border-color: var(--gold-500);
}

.page-about .about-vcard__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-vcard__title {
  font-size: 1.1rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-vcard__text {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-versions__figure {
  max-width: 640px;
  margin-top: 26px;
  margin-left: auto;
  aspect-ratio: 1000 / 640;
}

/* 03 团队 */
.page-about .about-team {
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-team__card {
  padding: 20px 18px 22px;
  background: var(--indigo-900);
  border: 1px solid var(--line);
  border-top: 2px solid var(--turquoise);
  border-radius: var(--radius);
}

.page-about .about-team__card--1 { border-top-color: var(--turquoise); }
.page-about .about-team__card--2 { border-top-color: var(--gold-500); }
.page-about .about-team__card--3 { border-top-color: var(--sky); }
.page-about .about-team__card--4 { border-top-color: var(--gold-300); }

.page-about .about-team__card h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
  color: var(--paper);
}

.page-about .about-team__card p {
  font-size: 14px;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .about-team__figure {
  margin-top: clamp(24px, 4vw, 40px);
  aspect-ratio: 7 / 4;
}

.page-about .about-team__process {
  margin-top: clamp(24px, 4vw, 40px);
  padding: clamp(20px, 3vw, 32px);
  background: var(--indigo-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-team__process h3 {
  font-size: 1.1rem;
  color: var(--gold-300);
}

.page-about .about-team__process-lede {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-process-list {
  list-style: none;
  counter-reset: about-step;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-process-list li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 0;
  border-top: 1px dashed var(--about-hair);
  font-size: 14.5px;
  line-height: 1.76;
  color: rgba(244, 241, 232, 0.86);
}

.page-about .about-process-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-process-list li::before {
  counter-increment: about-step;
  content: counter(about-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-500);
  padding-top: 4px;
}

/* 04 内容生产 */
.page-about .about-sources {
  padding: clamp(48px, 7vw, 88px) 0;
  background: var(--indigo-900);
  border-top: var(--border);
  border-bottom: var(--border);
}

.page-about .about-sources__inner {
  max-width: 860px;
  margin-inline: auto;
}

.page-about .about-sources__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-source {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-source__no {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-source h3 {
  margin-bottom: 8px;
  font-size: 1.06rem;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-source p {
  font-size: 15px;
  line-height: 1.88;
  color: var(--muted);
}

/* 05 合作与交流 */
.page-about .about-partners {
  position: relative;
  padding: clamp(48px, 7vw, 88px) 0 clamp(56px, 8vw, 100px);
}

.page-about .about-partners__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-partners__text {
  position: relative;
  padding-top: 8px;
}

.page-about .about-partners__text h2 {
  margin: 10px 0 14px;
  font-size: clamp(1.45rem, 3.1vw, 2.2rem);
  line-height: 1.26;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-partners__text p {
  margin-top: 16px;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--muted);
}

.page-about .about-partners__links a {
  color: var(--gold-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 217, 138, 0.45);
}

.page-about .about-partners__links a:hover {
  color: var(--gold-500);
  border-bottom-color: var(--gold-500);
}

.page-about .about-partners__facts {
  align-self: start;
  display: grid;
  gap: 16px;
  padding: 22px 20px;
  background: var(--indigo-900);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 4px 4px 0 rgba(46, 60, 120, 0.45);
}

.page-about .about-fact {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--about-hair);
}

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

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--gold-500);
}

.page-about .about-fact__label {
  font-size: 12.5px;
  line-height: 1.62;
  color: var(--muted);
}

/* 断点适配 */
@media (min-width: 640px) {
  .page-about .about-plates {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-lead__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-lead__side {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-plates {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-plate:nth-child(2) {
    margin-left: 10px;
  }

  .page-about .about-plate:nth-child(3) {
    margin-left: -6px;
  }

  .page-about .about-plate:nth-child(4) {
    margin-left: 16px;
  }

  .page-about .about-partners__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-team__card--1 { margin-top: 0; }
  .page-about .about-team__card--2 { margin-top: 30px; }
  .page-about .about-team__card--3 { margin-top: 12px; }
  .page-about .about-team__card--4 { margin-top: 44px; }

  .page-about .about-vcard {
    flex-basis: 340px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}