.page-about {
  --about-head-shadow: 0 16px 40px rgba(0, 0, 0, .35);
}

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

.page-about .nuoya-scanline {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
}

.page-about h1,
.page-about h2 {
  font-family: var(--nuoya-font-head);
  font-weight: 900;
  letter-spacing: -.02em;
  transform: skew(-6deg);
  line-height: 1.08;
  margin: 0;
  text-wrap: balance;
}

.page-about .about-section-label {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  font-family: var(--nuoya-font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--nuoya-lime);
  text-transform: uppercase;
  margin: 0 0 1rem;
}

.page-about .about-section-label::before {
  content: "";
  display: inline-block;
  width: 2.25rem;
  height: 1px;
  background: currentColor;
  opacity: .7;
}

.page-about .about-section-label-light {
  color: var(--nuoya-data);
}

.page-about .nuoya-tag {
  font-family: var(--nuoya-font-head);
  font-weight: 700;
  font-size: .72rem;
  letter-spacing: .08em;
}

/* ===== 首屏 ===== */
.page-about .about-story-hero {
  position: relative;
  background: var(--nuoya-night);
  color: var(--nuoya-snow);
  overflow: hidden;
  padding: 7.5rem 0 0;
}

.page-about .about-hero-grid {
  max-width: var(--nuoya-container);
  margin-inline: auto;
  padding-inline: var(--nuoya-gutter);
  display: grid;
  gap: 2rem;
  position: relative;
  z-index: 2;
}

.page-about .about-hero-copy {
  padding: 0 0 2.25rem;
}

.page-about .about-kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .8rem;
  font-family: var(--nuoya-font-mono);
  font-size: .82rem;
  letter-spacing: .16em;
  color: var(--nuoya-lime);
  margin: 0 0 1.4rem;
}

.page-about .about-kicker-line {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
}

.page-about .about-kicker-line::before {
  content: "";
  width: 1.25rem;
  height: 2px;
  background: var(--nuoya-lime);
}

.page-about .about-kicker-en {
  color: var(--nuoya-fog);
  opacity: .75;
}

.page-about .about-hero-copy h1 {
  font-size: clamp(2.5rem, 7vw, 5.25rem);
  margin-bottom: 1.6rem;
  color: var(--nuoya-snow);
  text-shadow: var(--about-head-shadow);
}

.page-about .about-lead {
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  line-height: 1.75;
  max-width: 38rem;
  color: var(--nuoya-fog);
  margin: 0 0 2rem;
}

.page-about .about-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: .9rem;
  margin-bottom: 2.4rem;
}

.page-about .about-signal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem 1.1rem;
  padding: .9rem 1.1rem;
  border-left: 2px solid var(--nuoya-lime);
  background: linear-gradient(90deg, rgba(180, 255, 57, .08), rgba(180, 255, 57, 0) 70%);
  margin-bottom: 2.2rem;
  font-family: var(--nuoya-font-mono);
  font-size: .82rem;
}

.page-about .about-signal-label {
  width: 100%;
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--nuoya-lime);
  text-transform: uppercase;
}

.page-about .about-signal-item {
  color: var(--nuoya-fog);
}

.page-about .about-signal-item b {
  color: var(--nuoya-snow);
  font-weight: 700;
}

.page-about .about-hero-index {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .6rem;
  max-width: 34rem;
}

.page-about .about-hero-index a {
  display: flex;
  align-items: baseline;
  gap: .65rem;
  padding: .85rem 1rem;
  background: rgba(14, 32, 69, .8);
  border: 1px solid rgba(184, 198, 212, .22);
  color: var(--nuoya-snow);
  text-decoration: none;
  font-size: .95rem;
  font-weight: 500;
  transition: border-color var(--nuoya-fast), background var(--nuoya-fast), transform var(--nuoya-fast);
}

.page-about .about-hero-index a span {
  font-family: var(--nuoya-font-mono);
  font-size: .75rem;
  color: var(--nuoya-lime);
}

.page-about .about-hero-index a:hover {
  border-color: var(--nuoya-lime);
  background: rgba(14, 32, 69, .95);
  transform: translateX(2px);
}

.page-about .about-hero-media {
  position: relative;
  min-height: 0;
}

.page-about .about-hero-media img {
  width: 100%;
  height: min(70vw, 520px);
  display: block;
  clip-path: polygon(4% 0, 100% 0, 96% 100%, 0 100%);
  box-shadow: var(--about-head-shadow);
}

.page-about .about-vertical-year {
  position: absolute;
  top: 1.25rem;
  right: 1rem;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--nuoya-font-mono);
  font-size: .82rem;
  letter-spacing: .22em;
  color: rgba(11, 27, 61, .6);
  background: rgba(240, 244, 248, .82);
  padding: .6rem .35rem;
}

/* ===== 时间轴区块 ===== */
.page-about .about-archives {
  background: var(--nuoya-night);
  color: var(--nuoya-snow);
  padding: 5rem 0 5.5rem;
  position: relative;
}

.page-about .about-archives::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 180px;
  background:
    linear-gradient(115deg, transparent 0 62%, rgba(180, 255, 57, .08) 62% 63%, transparent 63% 100%),
    linear-gradient(65deg, transparent 0 76%, rgba(255, 94, 58, .06) 76% 77%, transparent 77% 100%);
  pointer-events: none;
}

.page-about .about-archives-shell {
  max-width: var(--nuoya-container);
  margin-inline: auto;
  padding-inline: var(--nuoya-gutter);
  display: grid;
  gap: 2.8rem;
}

.page-about .about-index-col {
  min-width: 0;
}

.page-about .about-archives h2 {
  color: var(--nuoya-snow);
  margin-bottom: 1.2rem;
}

.page-about .about-intro {
  color: var(--nuoya-fog);
  line-height: 1.75;
  margin: 0 0 1.8rem;
}

.page-about .about-year-nav {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin-bottom: 1.6rem;
}

.page-about .about-year-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3.4rem;
  padding: .45rem .8rem;
  font-family: var(--nuoya-font-mono);
  font-size: .86rem;
  color: var(--nuoya-fog);
  border: 1px solid rgba(184, 198, 212, .3);
  background: rgba(14, 32, 69, .7);
  text-decoration: none;
  transform: skew(-6deg);
  transition: color var(--nuoya-fast), border-color var(--nuoya-fast), background var(--nuoya-fast);
}

.page-about .about-year-link:hover {
  color: var(--nuoya-night);
  border-color: var(--nuoya-lime);
  background: var(--nuoya-lime);
}

.page-about .about-rail-card {
  margin-top: 1.75rem;
  padding: 1.2rem 1.2rem 1.35rem;
  background: var(--nuoya-midnight);
  border-left: 2px solid var(--nuoya-data);
  box-shadow: 0 10px 26px rgba(0, 0, 0, .18);
  max-width: 24rem;
}

.page-about .about-rail-card-title {
  margin: .7rem 0 .35rem;
  font-family: var(--nuoya-font-head);
  font-weight: 800;
  font-size: 1.08rem;
  color: var(--nuoya-snow);
}

.page-about .about-rail-card-text {
  margin: 0 0 1.2rem;
  color: var(--nuoya-fog);
  font-size: .92rem;
  line-height: 1.7;
}

.page-about .about-timeline-col {
  min-width: 0;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 9px;
  width: 2px;
  background: linear-gradient(180deg, var(--nuoya-data), var(--nuoya-lime) 40%, var(--nuoya-lime) 80%, var(--nuoya-ocher));
  opacity: .6;
}

.page-about .about-timeline::after {
  content: "";
  position: absolute;
  left: 2px;
  width: 16px;
  height: 170px;
  background: linear-gradient(180deg, transparent, rgba(180, 255, 57, .28), transparent);
  animation: about-timeline-scan 5s var(--nuoya-ease) infinite;
  pointer-events: none;
}

@keyframes about-timeline-scan {
  0% { top: -10%; }
  100% { top: 105%; }
}

.page-about .about-t-item {
  position: relative;
  padding: 0 0 2.6rem 2.4rem;
}

.page-about .about-t-item::before {
  content: "";
  position: absolute;
  top: .35rem;
  left: 4px;
  width: 12px;
  height: 12px;
  background: var(--nuoya-night);
  border: 3px solid var(--nuoya-lime);
  transform: rotate(45deg);
  z-index: 2;
}

.page-about .about-t-item-minor::before {
  border-color: var(--nuoya-ocher);
}

.page-about .about-t-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .7rem;
  margin-bottom: .7rem;
}

.page-about .about-t-year {
  font-family: var(--nuoya-font-mono);
  font-size: .82rem;
  color: var(--nuoya-lime);
  letter-spacing: .08em;
}

.page-about .about-t-body {
  position: relative;
}

.page-about .about-t-body h3 {
  font-family: var(--nuoya-font-head);
  font-weight: 800;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  letter-spacing: -.01em;
  color: var(--nuoya-snow);
  margin: 0 0 .7rem;
  transform: skew(-4deg);
}

.page-about .about-t-body p {
  color: var(--nuoya-fog);
  line-height: 1.75;
  margin: 0 0 .9rem;
  font-size: .96rem;
}

.page-about .about-t-note {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  font-family: var(--nuoya-font-mono);
  font-size: .82rem;
  color: var(--nuoya-lime);
  margin: 0 !important;
}

.page-about .about-t-num {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--nuoya-snow);
  background: rgba(180, 255, 57, .08);
  padding: .15rem .45rem;
  border-left: 2px solid var(--nuoya-lime);
}

.page-about .about-t-media {
  padding: 0 0 2.6rem 0;
  position: relative;
}

.page-about .about-t-media figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  clip-path: polygon(3% 0, 100% 0, 97% 100%, 0 100%);
  background: var(--nuoya-midnight);
}

.page-about .about-t-media img {
  width: 100%;
  height: 320px;
  display: block;
  transition: transform var(--nuoya-med) var(--nuoya-ease);
}

.page-about .about-t-media figure:hover img {
  transform: scale(1.02);
}

.page-about .about-t-media figcaption {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  left: 1rem;
  padding: .6rem .9rem;
  background: rgba(11, 27, 61, .78);
  color: var(--nuoya-snow);
  font-size: .82rem;
  border-left: 2px solid var(--nuoya-lime);
}

/* ===== 数据能力档案 ===== */
.page-about .about-data-archive {
  background: var(--nuoya-snow);
  color: var(--nuoya-night);
  padding: 5rem 0 5.5rem;
  position: relative;
  overflow: hidden;
}

.page-about .about-data-archive h2 {
  max-width: var(--nuoya-container);
  margin-inline: auto;
  padding-inline: var(--nuoya-gutter);
  color: var(--nuoya-night);
  margin-bottom: 1rem;
  font-size: clamp(2.1rem, 4.5vw, 3.5rem);
}

.page-about .about-data-intro {
  max-width: var(--nuoya-container);
  margin-inline: auto;
  padding-inline: var(--nuoya-gutter);
  color: #41536d;
  line-height: 1.7;
  margin-bottom: 2.4rem;
}

.page-about .about-data-grid {
  max-width: var(--nuoya-container);
  margin-inline: auto;
  padding-inline: var(--nuoya-gutter);
  display: grid;
  gap: 1.2rem;
}

.page-about .about-data-card {
  position: relative;
  background: var(--nuoya-night);
  color: var(--nuoya-snow);
  padding: 1.4rem 1.4rem 1.6rem;
  overflow: hidden;
  border: 1px solid rgba(11, 27, 61, .2);
  box-shadow: 0 12px 30px rgba(11, 27, 61, .18);
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .about-data-card::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -80%;
  width: 55%;
  background: linear-gradient(105deg, transparent, rgba(180, 255, 57, .22), transparent);
  transform: skew(-18deg);
  transition: left .5s var(--nuoya-ease);
  pointer-events: none;
}

.page-about .about-data-card:hover::after {
  left: 130%;
}

.page-about .about-data-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.page-about .about-data-code {
  font-family: var(--nuoya-font-mono);
  font-size: .78rem;
  color: var(--nuoya-lime);
  opacity: .8;
}

.page-about .about-data-value {
  display: flex;
  align-items: baseline;
  gap: .4rem;
  margin: .25rem 0 0;
  font-family: var(--nuoya-font-mono);
  font-weight: 700;
}

.page-about .about-data-value span {
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  line-height: 1;
  color: var(--nuoya-snow);
}

.page-about .about-data-value small {
  font-family: var(--nuoya-font-body);
  font-size: .9rem;
  font-weight: 500;
  color: var(--nuoya-fog);
}

.page-about .about-data-card p:not(.about-data-value) {
  color: var(--nuoya-fog);
  font-size: .92rem;
  line-height: 1.65;
  margin: 0;
  padding-right: .5rem;
}

.page-about .about-data-link {
  margin-top: auto;
  color: var(--nuoya-lime);
  text-decoration: none;
  font-weight: 600;
  font-size: .88rem;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  border-bottom: 1px solid rgba(180, 255, 57, .5);
  align-self: flex-start;
  padding-bottom: .15rem;
}

.page-about .about-data-link:hover {
  color: var(--nuoya-snow);
  border-bottom-color: var(--nuoya-snow);
}

.page-about .about-method-card {
  max-width: var(--nuoya-container);
  margin: 2.4rem auto 0;
  padding-inline: var(--nuoya-gutter);
}

.page-about .about-method-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.25rem;
  background: var(--nuoya-midnight);
  border: 1px solid rgba(180, 255, 57, .4);
  border-left: 4px solid var(--nuoya-lime);
  color: var(--nuoya-snow);
  font-family: var(--nuoya-font-head);
  font-size: 1.06rem;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: background var(--nuoya-fast), border-color var(--nuoya-fast);
}

.page-about .about-method-toggle:hover {
  background: #132852;
  border-color: var(--nuoya-lime);
}

.page-about .about-method-icon {
  font-family: var(--nuoya-font-mono);
  color: var(--nuoya-lime);
  font-size: 1.3rem;
}

.page-about .about-method-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s var(--nuoya-ease), opacity .3s ease;
  opacity: 0;
}

.page-about [data-panel][data-state="open"] .about-method-body {
  max-height: 40rem;
  opacity: 1;
}

.page-about [data-panel][data-state="closed"] .about-method-body {
  max-height: 0;
  opacity: 0;
}

.page-about .about-method-inner {
  background: var(--nuoya-night);
  color: var(--nuoya-snow);
  padding: 1.6rem 1.4rem;
  border: 1px solid rgba(11, 27, 61, .25);
  border-top: none;
}

.page-about .about-method-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-method-list li {
  display: grid;
  gap: .55rem;
  line-height: 1.75;
  color: var(--nuoya-fog);
  font-size: .95rem;
  padding-left: .75rem;
  border-left: 2px solid rgba(180, 255, 57, .7);
}

.page-about .about-method-list .nuoya-tag {
  justify-self: start;
}

.page-about .about-rhombus {
  display: flex;
  justify-content: center;
  gap: .8rem;
  padding: 2.8rem var(--nuoya-gutter) 0;
}

.page-about .about-rhombus i {
  width: 12px;
  height: 12px;
  display: block;
  transform: rotate(45deg);
  background: var(--nuoya-data);
}

.page-about .about-rhombus i:nth-child(2) {
  background: var(--nuoya-lime);
}

.page-about .about-rhombus i:nth-child(3) {
  background: var(--nuoya-orange);
}

/* ===== 属地与联系 ===== */
.page-about .about-locate {
  background: var(--nuoya-night);
  color: var(--nuoya-snow);
  padding: 5rem 0 5.5rem;
  position: relative;
  overflow: hidden;
}

.page-about .about-locate::before {
  content: "";
  position: absolute;
  right: -10%;
  top: 12%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(61, 123, 255, .18), transparent 68%);
  pointer-events: none;
}

.page-about .about-locate-inner {
  max-width: var(--nuoya-container);
  margin-inline: auto;
  padding-inline: var(--nuoya-gutter);
  display: grid;
  gap: 2.6rem;
}

.page-about .about-locate-copy {
  min-width: 0;
}

.page-about .about-locate h2 {
  color: var(--nuoya-snow);
  margin-bottom: 1.2rem;
  font-size: clamp(2rem, 4.5vw, 3.4rem);
}

.page-about .about-locate-copy > p {
  color: var(--nuoya-fog);
  line-height: 1.8;
  margin: 0 0 1.8rem;
  max-width: 34rem;
}

.page-about .about-contact-list {
  margin: 0 0 1.4rem;
  padding: 0;
  display: grid;
  gap: .8rem;
}

.page-about .about-contact-row {
  display: grid;
  grid-template-columns: minmax(6rem, 8rem) minmax(0, 1fr);
  gap: 1rem;
  padding: .9rem 1rem;
  background: var(--nuoya-midnight);
  border-left: 2px solid var(--nuoya-data);
}

.page-about .about-contact-row dt {
  color: var(--nuoya-fog);
  font-size: .88rem;
}

.page-about .about-contact-row dd {
  margin: 0;
  font-family: var(--nuoya-font-mono);
  color: var(--nuoya-snow);
  display: flex;
  flex-direction: column;
  gap: .3rem;
}

.page-about .about-contact-sub {
  font-family: var(--nuoya-font-body);
  font-size: .82rem;
  color: var(--nuoya-fog);
}

.page-about .about-copy-btn {
  background: none;
  border: 0;
  padding: 0;
  margin: 0;
  color: var(--nuoya-snow);
  font-family: var(--nuoya-font-mono);
  font-size: .98rem;
  text-align: left;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(180, 255, 57, .55);
  transition: color var(--nuoya-fast);
}

.page-about .about-copy-btn:hover {
  color: var(--nuoya-lime);
}

.page-about .about-icp {
  font-size: .84rem;
  color: var(--nuoya-fog);
  margin: 0 0 1.6rem;
}

.page-about .about-contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
}

.page-about .about-locate-media {
  margin: 0;
  position: relative;
  min-width: 0;
}

.page-about .about-locate-media img {
  width: 100%;
  height: 280px;
  display: block;
  clip-path: polygon(5% 0, 100% 0, 95% 100%, 0 100%);
  box-shadow: 0 18px 44px rgba(0, 0, 0, .38);
}

.page-about .about-locate-media figcaption {
  margin-top: .9rem;
  color: var(--nuoya-fog);
  font-size: .84rem;
  line-height: 1.6;
  border-left: 2px solid var(--nuoya-lime);
  padding-left: .8rem;
}

/* ===== 响应式扩展 ===== */
@media (max-width: 639px) {
  .page-about .about-hero-index {
    grid-template-columns: 1fr;
  }

  .page-about .about-hero-cta .nuoya-btn {
    width: 100%;
    justify-content: center;
  }

  .page-about .about-contact-row {
    grid-template-columns: 1fr;
    gap: .35rem;
  }
}

@media (min-width: 640px) {
  .page-about .about-hero-media img {
    height: 460px;
  }

  .page-about .about-t-media img {
    height: 400px;
  }

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

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

  .page-about .about-locate-media img {
    height: 380px;
  }
}

@media (min-width: 900px) {
  .page-about .about-story-hero {
    padding-top: 8.5rem;
  }

  .page-about .about-story-hero::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    width: 46%;
    background: var(--nuoya-snow);
    clip-path: polygon(12% 0, 100% 0, 100% 100%, 0 100%);
    z-index: 1;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: center;
    gap: 3.5rem;
    min-height: 640px;
  }

  .page-about .about-hero-copy {
    padding-bottom: 4rem;
    z-index: 2;
  }

  .page-about .about-hero-media {
    z-index: 2;
  }

  .page-about .about-hero-media img {
    height: 520px;
  }

  .page-about .about-archives-shell {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 3.5rem;
  }

  .page-about .about-index-col {
    position: sticky;
    top: 5.5rem;
    align-self: start;
    padding-top: 1.4rem;
  }

  .page-about .about-archives h2 {
    font-size: clamp(2.1rem, 3.4vw, 3.2rem);
  }

  .page-about .about-t-item {
    padding-left: 2.6rem;
  }

  .page-about .about-data-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-locate-media img {
    height: 460px;
  }
}