.page-about {
  --about-sec: clamp(44px, 7vw, 92px);
  --about-soft: rgba(255, 255, 255, 0.74);
  --about-softer: rgba(255, 255, 255, 0.56);
  --about-brown-soft: rgba(35, 26, 20, 0.76);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about p {
  line-height: 1.75;
}

.page-about .about-crumbs {
  padding-top: clamp(16px, 3vw, 30px);
}

.page-about .about-block {
  padding-block: var(--about-sec);
}

.page-about .about-head {
  max-width: 100%;
  margin-bottom: clamp(24px, 4vw, 46px);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 10px 0 14px;
  color: var(--white);
}

.page-about .about-h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 25px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 6px 0 10px;
  color: var(--white);
}

.page-about .about-lede {
  max-width: 36em;
  margin: 0;
  color: var(--about-soft);
  font-size: clamp(14px, 1.6vw, 16px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(22px, 4vw, 44px);
  padding-bottom: clamp(36px, 6vw, 78px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(158deg, rgba(95, 216, 255, 0.10) 0%, rgba(7, 9, 11, 0) 46%),
    linear-gradient(22deg, rgba(182, 255, 59, 0.07) 0%, rgba(7, 9, 11, 0) 42%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0) 88%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0) 88%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 7.4vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--white);
}

.page-about .about-title em {
  display: block;
  font-style: normal;
  color: var(--lime);
}

.page-about .about-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin-top: 22px;
}

.page-about .about-hero-aside {
  border: 1px solid var(--line-strong);
  background: linear-gradient(140deg, rgba(95, 216, 255, 0.12), rgba(17, 21, 26, 0.92) 62%);
  padding: clamp(18px, 3vw, 26px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .about-aside-label {
  margin: 0;
  color: var(--ice);
}

.page-about .about-aside-big {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(40px, 7vw, 62px);
  line-height: 1;
  letter-spacing: -0.02em;
  margin: 8px 0 10px;
  color: var(--white);
}

.page-about .about-aside-text {
  margin: 0;
  font-size: 14px;
  color: var(--about-soft);
}

/* ---------- 历程时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-years ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-years li {
  border: 1px solid var(--line);
}

.page-about .about-years a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-height: 44px;
  padding: 10px 14px;
  color: var(--steel);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-years a:hover,
.page-about .about-years a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  background: rgba(182, 255, 59, 0.06);
}

.page-about .about-years .mono {
  color: var(--ice);
  font-size: 11px;
}

.page-about .about-milestones {
  border-left: 1px solid var(--line-soft);
  padding-left: clamp(16px, 2.6vw, 30px);
}

.page-about .about-milestone {
  position: relative;
  padding-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about .about-milestone + .about-milestone {
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(20px, 3vw, 32px);
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  top: 10px;
  left: calc(-1 * clamp(16px, 2.6vw, 30px) - 3px);
  width: 5px;
  height: 5px;
  background: var(--ice);
}

.page-about .about-milestone + .about-milestone::before {
  top: calc(clamp(20px, 3vw, 32px) + 10px);
}

.page-about .about-ms-time {
  margin: 0;
  color: var(--ice);
  letter-spacing: 0.08em;
}

.page-about .about-milestone p:last-child {
  margin: 0;
  max-width: 36em;
  color: var(--about-soft);
  font-size: 15px;
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-team-figure {
  margin: 0;
}

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

.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-role {
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-role:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .about-role[open] {
  border-color: var(--line-strong);
  background: linear-gradient(150deg, rgba(95, 216, 255, 0.08), var(--panel) 60%);
}

.page-about .about-role summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 56px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-role summary::-webkit-details-marker {
  display: none;
}

.page-about .about-role summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--steel);
  transition: color 0.2s var(--ease);
}

.page-about .about-role[open] summary::after {
  content: "−";
  color: var(--lime);
}

.page-about .about-role-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 30px;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-role-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-role-hint {
  color: var(--steel);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.page-about .about-role p {
  margin: 0;
  padding: 0 16px 16px;
  max-width: 34em;
  color: var(--about-soft);
  font-size: 14px;
}

/* ---------- 节点 ---------- */
.page-about .about-map {
  margin: 0 0 clamp(22px, 3.4vw, 36px);
}

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

.page-about .about-node-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-node {
  border-left: 2px solid var(--line-strong);
  padding: 10px 0 12px 14px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  border-color: var(--ice);
  transform: translateX(3px);
  background: rgba(95, 216, 255, 0.05);
}

.page-about .about-node-code {
  margin: 0;
  color: var(--steel);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-about .about-node-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  margin: 4px 0 6px;
  color: var(--white);
}

.page-about .about-node-desc {
  margin: 0 0 6px;
  font-size: 14px;
  color: var(--about-soft);
}

.page-about .about-node-state {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ice);
}

.page-about .about-network-note {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: var(--panel-deep);
  max-width: 46em;
  font-size: 14px;
  color: var(--about-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  background: var(--cream);
  color: var(--brown);
  padding-block: var(--about-sec);
}

.page-about .about-eco .about-h2 {
  color: var(--brown);
}

.page-about .about-eco .about-lede {
  color: var(--about-brown-soft);
}

.page-about .about-eco .kicker {
  color: var(--ember);
}

.page-about .about-eco-figure {
  margin: 0 0 clamp(22px, 3.4vw, 36px);
}

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

.page-about .about-eco-figure .figure-caption {
  color: var(--about-brown-soft);
}

.page-about .about-tagwall {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-tag {
  position: relative;
  border: 1px solid rgba(35, 26, 20, 0.28);
  background: #FBF5EA;
  padding: 16px 18px 18px;
}

.page-about .about-tag::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 18px;
  height: 18px;
  background: rgba(35, 26, 20, 0.16);
}

.page-about .about-tag--alt::before {
  background: var(--ice);
}

.page-about .about-tag--ember::before {
  background: var(--ember);
}

.page-about .about-tag-idx {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(35, 26, 20, 0.55);
}

.page-about .about-tag-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  margin: 6px 0 4px;
  color: var(--brown);
}

.page-about .about-tag-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ember);
  letter-spacing: 0.04em;
}

.page-about .about-tag-desc {
  margin: 0;
  font-size: 14px;
  color: var(--about-brown-soft);
}

.page-about .about-honors {
  margin-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid rgba(35, 26, 20, 0.28);
  padding-top: clamp(18px, 3vw, 26px);
}

.page-about .about-honors-kicker {
  color: var(--ember);
}

.page-about .about-honor-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-honor-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 15px;
  color: var(--brown);
  border-bottom: 1px dashed rgba(35, 26, 20, 0.22);
  padding-bottom: 10px;
}

.page-about .about-honor-list .mono {
  color: var(--ember);
  font-size: 11px;
  letter-spacing: 0.1em;
}

/* ---------- 准则 ---------- */
.page-about .about-rule-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  counter-reset: none;
}

.page-about .about-rule {
  position: relative;
  border-top: 1px solid var(--line);
  padding: 20px 0 22px;
}

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

.page-about .about-rule-idx {
  margin: 0;
  color: var(--lime);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-about .about-rule p:last-child {
  margin: 0;
  max-width: 35em;
  color: var(--about-soft);
  font-size: 15px;
}

/* ---------- 下一步 ---------- */
.page-about .about-next-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: center;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(135deg, rgba(182, 255, 59, 0.10), rgba(17, 21, 26, 0.95) 55%),
    var(--panel);
  padding: clamp(22px, 4vw, 42px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .about-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-role:first-child {
    grid-column: span 2;
  }

  .page-about .about-node-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 20px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: end;
  }

  .page-about .about-timeline {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-years ol {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-years li {
    border: 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .page-about .about-years a {
    padding: 12px 10px 12px 14px;
    border-left: 2px solid transparent;
    margin-left: -1px;
  }

  .page-about .about-years a:hover,
  .page-about .about-years a:focus-visible {
    border-left-color: var(--lime);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-role:first-child {
    grid-column: span 6;
  }

  .page-about .about-role:nth-child(2),
  .page-about .about-role:nth-child(3) {
    grid-column: span 3;
  }

  .page-about .about-role:nth-child(4) {
    grid-column: span 6;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: clamp(24px, 3.4vw, 44px);
  }

  .page-about .about-node-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-tagwall {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-rule-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 3.4vw, 48px);
  }

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

  .page-about .about-next-panel {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }

  .page-about .about-next-actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-node,
  .page-about .about-years a {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-node:hover,
  .page-about .about-node:focus-within {
    transform: none;
  }
}