.page-about {
  --about-measure: 34em;
  position: relative;
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(42, 53, 80, 0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 53, 80, 0.22) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--text);
  font-family: var(--sans);
  overflow-x: hidden;
}

.page-about .section {
  padding: clamp(56px, 9vw, 112px) 0;
}

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

.page-about .media-frame {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--card);
  padding: 0;
}

.page-about .media-frame figcaption {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  padding: 12px 16px;
  border-top: 2px solid var(--line);
}

/* ---------------- hero ---------------- */

.about-hero {
  position: relative;
  padding: clamp(104px, 15vw, 168px) 0 clamp(48px, 6vw, 76px);
  overflow: hidden;
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -15% auto -15%;
  height: 120%;
  background:
    radial-gradient(50% 55% at 18% 38%, rgba(23, 224, 176, 0.17), transparent 68%),
    radial-gradient(46% 50% at 82% 18%, rgba(123, 91, 255, 0.20), transparent 70%);
  pointer-events: none;
}

.about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .crumbs {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .crumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0 0 20px;
}

.page-about .about-hero .eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--cyan);
}

.about-hero h1 {
  font-family: var(--serif);
  font-size: clamp(38px, 8vw, 64px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(18px, 3vw, 28px);
  color: var(--text);
  max-width: 18em;
}

.about-lede {
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.9;
  color: var(--muted);
  max-width: 40em;
  margin: 0;
  padding-left: clamp(14px, 2vw, 22px);
  border-left: 2px solid var(--violet);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
  margin: clamp(32px, 5vw, 52px) 0 0;
}

.about-stat {
  background: var(--panel);
  padding: 18px 18px 20px;
  min-width: 0;
}

.about-stat dt {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0;
}

.about-stat dd {
  margin: 10px 0 0;
  font-family: var(--serif);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-about .sec-num {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--violet);
  display: block;
  margin-bottom: 12px;
}

.about-sec-head {
  margin-bottom: clamp(28px, 4vw, 48px);
  max-width: 46em;
}

.about-sec-head h2,
.about-mc-main h2,
.about-audit-copy h2 {
  font-family: var(--serif);
  font-size: clamp(26px, 4.2vw, 44px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.012em;
  margin: 0;
  color: var(--text);
}

.about-sec-lede {
  font-size: 16px;
  line-height: 1.9;
  color: var(--muted);
  margin: 16px 0 0;
  max-width: 34em;
}

/* ---------------- 01 claim ---------------- */

.about-claim-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.about-copy {
  max-width: var(--about-measure);
}

.about-copy p {
  font-size: 17px;
  line-height: 1.92;
  color: var(--text);
  margin: 0 0 1.15em;
}

.about-copy p:last-child {
  margin-bottom: 0;
}

.about-aside {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.about-side-figure {
  border-color: var(--cyan);
}

.about-note {
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
  margin: 0;
  padding: 14px 16px;
  background: var(--panel);
  border: 2px solid var(--line);
  border-left-color: var(--cyan);
}

.about-boundary {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
  margin-top: clamp(32px, 5vw, 56px);
}

.about-boundary-col {
  background: var(--panel);
  padding: clamp(20px, 3vw, 30px);
}

.about-boundary-col--off {
  background: var(--card);
}

.about-boundary-tag {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  margin-bottom: 16px;
}

.about-boundary-col--on .about-boundary-tag {
  color: var(--cyan);
}

.about-boundary-col--off .about-boundary-tag {
  color: var(--danger);
}

.about-boundary-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.about-boundary-col li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.about-boundary-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 2px;
}

.about-boundary-col--on li::before {
  background: var(--cyan);
}

.about-boundary-col--off li::before {
  background: var(--danger);
}

/* ---------------- 02 timeline ---------------- */

.about-timeline-figure {
  margin-bottom: clamp(36px, 5vw, 64px);
}

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

.about-tl-rail {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}

.about-tl-rail a {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-decoration: none;
  padding: 6px 11px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.about-tl-rail a:hover,
.about-tl-rail a:focus-visible {
  color: var(--on-accent);
  background: var(--cyan);
  border-color: var(--cyan);
}

.about-tl-list {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 0 clamp(26px, 4vw, 40px);
}

.about-tl-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 24px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 58%, var(--amber) 100%);
  opacity: 0.7;
}

.about-tl-item {
  position: relative;
  padding: 0 0 clamp(34px, 5vw, 56px);
  scroll-margin-top: 96px;
}

.about-tl-item:last-child {
  padding-bottom: 0;
}

.about-tl-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(26px, 4vw, 40px));
  top: 12px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  border: 2px solid var(--ink);
  box-shadow: 0 0 0 3px rgba(255, 176, 32, 0.2);
}

.about-tl-item:target {
  background: linear-gradient(90deg, rgba(23, 224, 176, 0.09), transparent 72%);
}

.about-tl-item:target .about-tl-year {
  color: var(--cyan);
}

.about-tl-item:target::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(23, 224, 176, 0.22);
}

.about-tl-year {
  display: block;
  font-family: var(--serif);
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 12px;
  transition: color 160ms ease;
}

.about-tl-item h3 {
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
  margin: 0 0 10px;
}

.about-tl-item p {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--muted);
  margin: 0;
  max-width: 34em;
}

/* ---------------- 03 principles ---------------- */

.about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
}

.about-rule {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--card);
  border: 2px solid var(--line);
  padding: 26px 22px 24px;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.about-rule:hover {
  border-color: var(--cyan);
  background: var(--panel);
  transform: translate(-3px, -3px);
  box-shadow: var(--hard-cyan);
}

.about-rule-num {
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.about-rule:nth-child(3n + 2) .about-rule-num {
  color: var(--violet);
}

.about-rule:nth-child(3n + 3) .about-rule-num {
  color: var(--amber);
}

.about-rule h3 {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
  margin: 0;
}

.about-rule p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  margin: 0;
}

/* ---------------- 04 multichain ---------------- */

.about-mc-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
}

.about-mc-main .about-copy {
  margin-top: 20px;
}

.about-mc-side {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.about-chain-notes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}

.about-chain-notes li {
  background: var(--panel);
  padding: 20px 20px 22px;
}

.about-chain-key {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--violet);
  border: 1px solid var(--line);
  padding: 3px 9px;
  margin-bottom: 12px;
}

.about-chain-notes p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
  margin: 0;
}

.about-mc-cta {
  align-self: flex-start;
}

/* ---------------- 05 audit ---------------- */

.about-audit-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}

.about-audit-figure {
  background:
    radial-gradient(80% 80% at 30% 25%, rgba(123, 91, 255, 0.32), transparent 72%),
    var(--card);
  padding: clamp(28px, 4vw, 44px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
}

.about-audit-num {
  font-family: var(--mono);
  font-size: clamp(64px, 12vw, 112px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--text);
}

.about-audit-unit {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.about-audit-copy {
  background: var(--panel);
  padding: clamp(26px, 4vw, 44px);
}

.about-audit-copy p {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--muted);
  margin: 18px 0 0;
  max-width: 34em;
}

.about-audit-list {
  list-style: none;
  margin: 24px 0 26px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 2px solid var(--line);
  padding-top: 20px;
}

.about-audit-list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.about-audit-list .mono {
  color: var(--violet);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  flex: 0 0 auto;
}

/* ---------------- 06 team ---------------- */

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

.about-team-figure {
  border-color: var(--violet);
  align-self: start;
}

.about-team-copy p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text);
  margin: 0 0 1.1em;
  max-width: 34em;
}

.about-team-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
  margin: 26px 0 26px;
}

.about-team-facts > div {
  background: var(--card);
  padding: 16px 16px 18px;
  min-width: 0;
}

.about-team-facts dt {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin: 0;
}

.about-team-facts dd {
  margin: 8px 0 0;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

/* ---------------- 07 next ---------------- */

.about-next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 18px);
}

.about-next-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--card);
  border: 2px solid var(--line);
  padding: 24px 22px 22px;
  text-decoration: none;
  color: inherit;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.about-next-card:hover {
  border-color: var(--cyan);
  background: var(--panel);
  transform: translate(-3px, -3px);
  box-shadow: var(--hard-cyan);
}

.about-next-idx {
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.about-next-card h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  margin: 0;
  color: var(--text);
}

.about-next-card p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
}

.about-next-go {
  margin-top: 4px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

/* ---------------- 响应式 ---------------- */

@media (min-width: 720px) {
  .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 900px) {
  .about-claim-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .about-aside {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .about-mc-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
    gap: clamp(36px, 4.5vw, 72px);
  }

  .about-audit-panel {
    grid-template-columns: minmax(240px, 0.72fr) minmax(0, 1.6fr);
  }

  .about-team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .about-tl {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .about-tl-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .about-tl-rail a {
    border-color: transparent;
    background: transparent;
    padding: 7px 0 7px 12px;
    border-left: 2px solid var(--line);
    text-align: left;
  }

  .about-tl-rail a:hover,
  .about-tl-rail a:focus-visible {
    background: transparent;
    color: var(--cyan);
    border-color: var(--cyan);
  }
}

@media (min-width: 1100px) {
  .about-rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }
}