.page-about {
  --about-axis: 1.375rem;
  display: block;
  overflow-x: hidden;
  background: var(--paper-100);
  color: var(--char-900);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--ice-400);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(2rem, 6vw, 3.5rem)) 0 clamp(2.75rem, 7vw, 4.5rem);
  background:
    radial-gradient(130% 95% at 84% 14%, #14382F 0%, #0C2621 56%, #071613 100%);
  color: var(--paper-100);
}

.page-about .about-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(44, 87, 73, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(44, 87, 73, 0.5) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.5;
  -webkit-mask-image: radial-gradient(120% 100% at 72% 18%, #000 0%, transparent 74%);
  mask-image: radial-gradient(120% 100% at 72% 18%, #000 0%, transparent 74%);
  pointer-events: none;
}

.page-about .about-hero__flare {
  position: absolute;
  top: -30%;
  right: -12%;
  width: 62%;
  height: 150%;
  background: linear-gradient(152deg, rgba(217, 166, 46, 0.2), rgba(217, 166, 46, 0) 62%);
  transform: rotate(-8deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--wrap-wide);
  margin: 0 auto;
  padding-inline: var(--gutter);
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.35rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--mist-400);
}

.page-about .breadcrumb a {
  color: var(--mist-400);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

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

.page-about .breadcrumb__sep {
  color: var(--moss-600);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--gold-300);
}

.page-about .mono-label {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-500);
}

.page-about .mono-label::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.85;
}

.page-about .mono-label--ink {
  color: var(--rust-500);
}

.page-about .about-hero__label {
  color: var(--gold-300);
}

.page-about .about-hero__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 6.2vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper-100);
}

.page-about .about-hero__lede {
  margin: 0 0 2rem;
  max-width: 46ch;
  font-size: clamp(0.98rem, 2.4vw, 1.0625rem);
  line-height: 1.85;
  color: rgba(245, 240, 228, 0.82);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 1px;
  background: var(--line-dark-soft);
  border: 1px solid var(--line-dark-soft);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 1.1rem;
  background: rgba(10, 33, 28, 0.78);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--gold-300);
}

.page-about .about-hero__unit {
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--mist-400);
}

.page-about .about-hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .compass {
  width: min(100%, 320px);
  height: auto;
  animation: about-compass-in 0.9s var(--ease) both;
}

@keyframes about-compass-in {
  from {
    opacity: 0;
    transform: scale(0.94) rotate(-6deg);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 区块骨架 ---------- */

.page-about .about-section {
  position: relative;
  overflow: hidden;
  padding: clamp(3rem, 8vw, 5.5rem) 0;
}

.page-about .about-section--paper {
  background: var(--paper-100);
  color: var(--char-900);
}

.page-about .about-section--ink {
  background: var(--ink-900);
  color: var(--paper-100);
}

.page-about .about-section--ink::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(44, 87, 73, 0.24) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(44, 87, 73, 0.24) 1px, transparent 1px);
  background-size: 120px 120px;
  pointer-events: none;
}

.page-about .about-wrap {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .about-h2 {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.55rem, 4.6vw, 2.35rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--char-900);
}

.page-about .about-h2--ink {
  color: var(--paper-100);
}

.page-about .about-p {
  margin: 0 0 1rem;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--char-900);
}

.page-about .about-p--ink {
  color: rgba(245, 240, 228, 0.84);
}

.page-about .about-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.6rem;
  padding-bottom: 0.22rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--rust-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(148, 48, 44, 0.4);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-link::after {
  content: "→";
}

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

/* ---------- 媒体框 ---------- */

.page-about .media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  background: var(--ink-850);
}

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

.page-about .media-frame__caption {
  padding: 0.7rem 0.95rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--mist-400);
  background: var(--ink-900);
  border-top: 1px solid var(--line-dark-soft);
}

/* ---------- 01 坐标 ---------- */

.page-about .origin-grid {
  display: grid;
  gap: 1.75rem;
  margin-top: 1.25rem;
}

.page-about .origin-grid__figure {
  margin-top: 0.5rem;
}

/* ---------- 02 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr);
  gap: 0 1rem;
  padding-bottom: 1.9rem;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: var(--about-axis);
  top: 1.05rem;
  bottom: -0.2rem;
  width: 1px;
  background: var(--line-dark);
  transform: translateX(-0.5px);
}

.page-about .timeline__item:last-child::before {
  display: none;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0.5rem;
}

.page-about .timeline__marker {
  display: flex;
  justify-content: center;
  padding-top: 0.5rem;
}

.page-about .timeline__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--moss-600);
  box-shadow: 0 0 0 3px rgba(44, 87, 73, 0.3);
  transition: background 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.page-about .timeline__item.is-in .timeline__dot,
.page-about .timeline__item:hover .timeline__dot {
  background: var(--gold-500);
  box-shadow: 0 0 0 5px rgba(217, 166, 46, 0.2);
}

.page-about .timeline__season {
  margin: 0 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--gold-300);
}

.page-about .timeline__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2.8vw, 1.22rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 58ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(245, 240, 228, 0.76);
}

.page-about .timeline-figure {
  margin-top: 1.5rem;
}

/* ---------- 03 体系 ---------- */

.page-about .code-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 1.75rem 0 1.5rem;
  background: var(--line-light);
  border: 1px solid var(--line-light);
}

.page-about .code-strip__cell {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.15rem 1.1rem;
  background: var(--paper-200);
  border-left: 3px solid var(--moss-600);
}

.page-about .code-strip__cell:nth-child(2) {
  border-left-color: var(--gold-500);
}

.page-about .code-strip__cell:nth-child(3) {
  border-left-color: var(--ice-400);
}

.page-about .code-strip__cell:nth-child(4) {
  border-left-color: var(--rust-500);
}

.page-about .code-strip__k {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--rust-500);
}

.page-about .code-strip__v {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--char-900);
}

.page-about .code-strip__ex {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--moss-600);
}

.page-about .tag-row {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.5rem;
  padding: 0;
}

.page-about .tag-row__item {
  padding: 0.4rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--char-900);
  border: 1px solid var(--moss-600);
  border-radius: 999px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .tag-row__item:hover {
  border-color: var(--gold-500);
  color: var(--rust-500);
}

/* ---------- 04 团队 ---------- */

.page-about .team-grid {
  display: grid;
  gap: 2rem;
  margin-top: 1.25rem;
}

.page-about .team-roles {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 1.5rem 0 0;
  padding: 0;
  background: var(--line-dark-soft);
  border: 1px solid var(--line-dark-soft);
}

.page-about .team-roles li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.15rem 0.9rem;
  align-items: baseline;
  padding: 1rem 1.1rem;
  background: rgba(20, 56, 47, 0.6);
}

.page-about .team-roles__k {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1;
  color: var(--gold-300);
}

.page-about .team-roles__v {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--paper-100);
}

.page-about .team-roles__d {
  grid-column: 2;
  font-size: 0.85rem;
  line-height: 1.72;
  color: rgba(245, 240, 228, 0.7);
}

.page-about .team-grid__figure {
  margin-top: 0.5rem;
}

/* ---------- 05 合作 ---------- */

.page-about .partner-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.75rem;
}

.page-about .partner-card {
  padding: 1.5rem 1.25rem 1.4rem;
  background: var(--paper-200);
  border-top: 3px solid var(--moss-600);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .partner-card--award {
  border-top-color: var(--gold-500);
}

.page-about .partner-card:hover {
  transform: translateY(-4px);
  border-top-color: var(--gold-500);
}

.page-about .partner-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.15rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--char-900);
}

.page-about .partner-card__title {
  margin: 0.65rem 0 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--char-900);
}

.page-about .partner-card__text {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--moss-600);
}

/* ---------- 06 数据看板 ---------- */

.page-about .metric-board {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 1.75rem 0 0;
  padding: 0;
  background: rgba(127, 212, 232, 0.2);
  border: 1px solid rgba(127, 212, 232, 0.3);
}

.page-about .metric-board__cell {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.35rem 1.15rem;
  background: rgba(12, 38, 33, 0.86);
}

.page-about .metric-board__num {
  font-family: var(--font-mono);
  font-size: clamp(1.65rem, 4.5vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ice-400);
}

.page-about .metric-board__unit {
  font-size: 0.87rem;
  font-weight: 700;
  color: var(--paper-100);
}

.page-about .metric-board__note {
  font-size: 0.77rem;
  line-height: 1.7;
  color: rgba(245, 240, 228, 0.6);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 46ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(245, 240, 228, 0.78);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.page-about .about-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.35rem;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: transform 0.25s var(--ease), background-color 0.25s var(--ease),
    border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-btn--gold {
  background: var(--gold-500);
  color: var(--ink-900);
}

.page-about .about-btn--gold:hover {
  background: var(--gold-300);
  transform: translateY(-2px);
}

.page-about .about-btn--ghost {
  border-color: var(--line-dark);
  color: var(--paper-100);
}

.page-about .about-btn--ghost:hover {
  border-color: var(--gold-500);
  color: var(--gold-300);
  transform: translateY(-2px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .code-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    align-items: center;
    gap: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: start;
    gap: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .timeline-figure {
    margin-left: 3.75rem;
  }

  .page-about .about-cta {
    flex-wrap: nowrap;
  }
}

@media (min-width: 1000px) {
  .page-about .code-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .compass {
    animation: none;
  }

  .page-about .timeline__dot,
  .page-about .partner-card,
  .page-about .about-btn {
    transition-duration: 0.01ms;
  }

  .page-about .partner-card:hover,
  .page-about .about-btn:hover {
    transform: none;
  }
}