.page-about {
  position: relative;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.2;
}

.page-about a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.page-about .section-index {
  color: var(--color-accent);
}

.page-about .section-desc {
  max-width: 60ch;
}

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

.page-about .image-frame figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-dim);
  border-left: 3px solid var(--color-accent);
  background: rgba(16, 33, 61, 0.5);
}

.page-about__hero {
  position: relative;
  padding: 32px 0 56px;
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 460px;
  background:
    linear-gradient(115deg, rgba(0, 230, 118, 0.07), transparent 38%),
    repeating-linear-gradient(-45deg, rgba(0, 230, 118, 0.04) 0 1px, transparent 1px 9px);
  pointer-events: none;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 7%;
  width: 90px;
  height: 90px;
  border: 1px solid rgba(0, 230, 118, 0.28);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-about__hero-grid {
  position: relative;
  display: grid;
  gap: 36px;
}

.page-about__hero-copy {
  max-width: 680px;
}

.page-about__hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  background: rgba(0, 230, 118, 0.08);
  border: 1px solid rgba(0, 230, 118, 0.28);
  border-radius: 999px;
}

.page-about__hero-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 5vw, 52px);
  letter-spacing: -0.02em;
}

.page-about__lead {
  margin: 0 0 28px;
  max-width: 56ch;
  font-size: clamp(15px, 2.2vw, 17px);
  color: var(--color-text-dim);
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about__hero-sheet {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 20px;
  background:
    linear-gradient(140deg, rgba(16, 33, 61, 0.92), rgba(27, 43, 75, 0.88)),
    var(--color-bg-panel);
  border: 1px solid rgba(46, 61, 92, 0.8);
  box-shadow: 0 22px 50px rgba(0, 0, 0, 0.35);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about__hero-sheet::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 72px;
  height: 5px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-soft));
}

.page-about__hero-item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 18px 16px;
  background: rgba(10, 20, 40, 0.62);
  border-left: 2px solid var(--color-accent);
}

.page-about__hero-item--main {
  background: linear-gradient(135deg, rgba(0, 230, 118, 0.14), rgba(10, 20, 40, 0.4));
  border-left: 3px solid var(--color-accent);
}

.page-about__hero-label {
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-text-dim);
}

.page-about__hero-value {
  font-family: var(--font-mono);
  font-size: 36px;
  line-height: 1.15;
  font-weight: 700;
  color: var(--color-accent);
}

.page-about__hero-item--main .page-about__hero-value {
  font-size: 44px;
  color: var(--color-accent-soft);
}

.page-about__hero-caption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-text-dim);
}

.page-about__hero-corner {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 10px;
  height: 10px;
  background: var(--color-warn);
  transform: rotate(45deg);
}

@media (min-width: 480px) {
  .page-about__hero-sheet {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__hero-item--main {
    grid-column: 1 / -1;
  }
}

.page-about__origin-panel {
  position: relative;
  display: grid;
  gap: 24px;
  padding: 28px 22px;
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 28px 100%, 0 calc(100% - 28px));
  overflow: hidden;
}

.page-about__origin-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 180px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
}

.page-about__origin-text p {
  margin: 0 0 16px;
  color: rgba(245, 247, 250, 0.88);
}

.page-about__origin-text p:last-child {
  margin-bottom: 0;
}

.page-about__quote {
  position: relative;
  margin: 0;
  padding: 20px 18px;
  background: rgba(10, 20, 40, 0.62);
  border-right: 3px solid var(--color-warn);
}

.page-about__quote p {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 600;
}

.page-about__quote cite {
  font-size: 13px;
  font-style: normal;
  color: var(--color-text-dim);
}

.page-about__mission-grid {
  display: grid;
  gap: 20px;
}

.page-about__mission-item {
  position: relative;
  padding: 26px 22px 30px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about__mission-item::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 0;
  height: 3px;
  background: var(--color-accent);
  transition: width 0.25s ease;
}

.page-about__mission-item:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
}

.page-about__mission-item:hover::after {
  width: 80px;
}

.page-about__mission-item--warn {
  border-top: 4px solid var(--color-warn);
}

.page-about__mission-item--warn .page-about__mission-num {
  color: var(--color-warn);
}

.page-about__mission-num {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

.page-about__mission-item h3 {
  margin: 0 0 12px;
  font-size: 20px;
}

.page-about__mission-item p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-dim);
}

.page-about__milestone-cover {
  margin: 0 0 40px;
}

.page-about__timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 28px;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-soft), var(--color-border));
}

.page-about__timeline-item {
  position: relative;
  padding-left: 48px;
}

.page-about__timeline-node {
  position: absolute;
  left: 0;
  top: 0;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-bg-deep);
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(0, 230, 118, 0.12);
}

.page-about__timeline-body {
  padding: 6px 14px 14px;
  border-left: 2px solid var(--color-border);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-about__timeline-item:hover .page-about__timeline-body {
  background: rgba(27, 43, 75, 0.45);
  border-left-color: var(--color-accent);
}

.page-about__timeline-body h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.page-about__timeline-body p {
  margin: 0;
  max-width: 68ch;
  color: var(--color-text-dim);
  font-size: 14px;
}

.page-about__coverage-grid {
  display: grid;
  gap: 20px;
}

.page-about__coverage-item {
  position: relative;
  padding: 28px 24px 32px;
  background: var(--color-bg-panel);
  border-top: 3px solid var(--color-border);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about__coverage-item:hover {
  transform: translateY(-4px);
  border-top-color: var(--color-accent);
}

.page-about__coverage-icon {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  color: var(--color-accent);
  background: rgba(0, 230, 118, 0.1);
  border: 1px solid rgba(0, 230, 118, 0.2);
}

.page-about__coverage-item h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.page-about__coverage-item p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-dim);
}

.page-about__coverage-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 20px;
  margin-top: 28px;
  padding: 24px;
  background: var(--color-bg-card);
  border-right: 4px solid var(--color-warn);
}

.page-about__coverage-summary .stat-label {
  font-size: 14px;
}

.page-about__coverage-summary .stat-value {
  font-size: 30px;
  color: var(--color-accent);
}

.page-about__coverage-sep {
  width: 24px;
  height: 2px;
  align-self: center;
  background: var(--color-accent);
}

.page-about__capability-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about__capability-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about__capability-list .stat-line {
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 16px;
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
}

.page-about__capability-list .stat-line:nth-child(2) {
  border-top: 3px solid var(--color-warn);
}

.page-about__capability-list .stat-label {
  font-size: 12px;
}

.page-about__capability-list .stat-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
}

.page-about__capability-chart {
  margin: 0;
}

.page-about__capability-chart img {
  border: 1px solid var(--color-border);
}

.page-about__hunan-panel {
  position: relative;
  display: grid;
  gap: 28px;
  padding: 24px;
  background: linear-gradient(140deg, rgba(16, 33, 61, 0.94), rgba(10, 20, 40, 0.9));
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-warn);
}

.page-about__hunan-copy p {
  margin: 0 0 20px;
  color: var(--color-text-dim);
}

.page-about__hunan-copy .desc-plate {
  margin-bottom: 24px;
}

.page-about__hunan-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about__hunan-image {
  margin: 0;
  border: 1px solid var(--color-border);
}

.page-about__hunan-image img {
  width: 100%;
  object-fit: cover;
}

@media (min-width: 700px) {
  .page-about__coverage-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about__capability-list {
    gap: 16px;
  }

  .page-about__timeline {
    gap: 0;
  }

  .page-about__timeline-item {
    display: grid;
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 0 64px;
    padding-left: 0;
  }

  .page-about__timeline::before {
    left: 136px;
    top: 4px;
    bottom: 4px;
  }

  .page-about__timeline-node {
    position: static;
    width: auto;
    height: auto;
    justify-self: end;
    align-self: start;
    padding-top: 2px;
    font-size: 20px;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    color: var(--color-accent);
  }

  .page-about__timeline-item::before {
    content: "";
    position: absolute;
    left: 131px;
    top: 8px;
    width: 12px;
    height: 12px;
    background: var(--color-accent);
    transform: rotate(45deg);
    box-shadow: 0 0 0 4px rgba(0, 230, 118, 0.12);
  }

  .page-about__timeline-item:nth-child(odd)::before {
    background: var(--color-accent-soft);
  }

  .page-about__timeline-body {
    padding: 4px 24px 56px;
  }

  .page-about__timeline-item:last-child .page-about__timeline-body {
    padding-bottom: 0;
  }
}

@media (min-width: 760px) {
  .page-about__mission-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 860px) {
  .page-about__capability-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 56px;
  }

  .page-about__hunan-panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 48px;
    padding: 40px;
  }
}

@media (min-width: 900px) {
  .page-about__origin-panel {
    grid-template-columns: 1.4fr 0.8fr;
    gap: 48px;
    padding: 40px 44px;
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    padding: 48px 0 80px;
  }

  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 0.85fr);
    gap: 56px;
    align-items: stretch;
  }

  .page-about__hero-sheet {
    margin: 0;
  }

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