.page-about {
  --about-line: 1px solid rgba(168, 198, 218, 0.55);
  --about-pad-y: 44px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

.page-about .coord--light {
  color: rgba(244, 241, 234, 0.72);
  border-color: rgba(244, 241, 234, 0.28);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: 24px 0 40px;
  border-bottom: var(--about-line);
  background:
    linear-gradient(180deg, rgba(168, 198, 218, 0.18) 0%, rgba(244, 241, 234, 0) 62%);
}

.page-about .about-hero__pattern {
  position: absolute;
  top: -60px;
  right: -80px;
  width: 340px;
  height: 340px;
  opacity: 0.16;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  margin-top: 26px;
  display: grid;
  gap: 30px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.12;
  font-weight: 900;
  letter-spacing: 0.03em;
  max-width: 15em;
}

.page-about .about-hero__intro {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: 1.0625rem;
  line-height: 1.85;
  font-weight: 400;
  color: rgba(20, 22, 26, 0.82);
}

.page-about .about-hero__note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  line-height: 1.8;
  color: rgba(20, 22, 26, 0.6);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(168, 198, 218, 0.6);
  border: var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px 18px;
  background: var(--paper);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 8vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--blue-ink);
}

.page-about .about-fact__label {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: rgba(20, 22, 26, 0.62);
}

/* 内容路线 */
.page-about .about-route {
  margin-top: 34px;
  padding-top: 18px;
  border-top: var(--about-line);
}

.page-about .about-route__caption {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: rgba(20, 22, 26, 0.52);
}

.page-about .about-route__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 26px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-route__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding-bottom: 6px;
  border-bottom: 2px solid transparent;
  font-size: 0.875rem;
}

.page-about .about-route__item--current {
  border-bottom-color: var(--neon);
}

.page-about .about-route__code {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--blue-sub);
}

.page-about .about-route__item--current .about-route__code {
  color: var(--neon);
}

.page-about .about-route__link {
  text-decoration: none;
  color: rgba(20, 22, 26, 0.82);
  letter-spacing: 0.04em;
}

.page-about .about-route__item--current .about-route__link {
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-route__item a:hover {
  color: var(--blue-ink);
}

/* ============ 通用标题 ============ */
.page-about .about-timeline__title,
.page-about .about-scope__title,
.page-about .about-check__title,
.page-about .about-team__title,
.page-about .about-ecosystem__title,
.page-about .about-misread__title {
  margin: 14px 0 0;
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  line-height: 1.25;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.page-about .about-legal__title {
  margin: 14px 0 0;
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  line-height: 1.3;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--paper);
}

/* ============ 沿革年表 ============ */
.page-about .about-timeline {
  padding: var(--about-pad-y) 0;
  border-bottom: var(--about-line);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-timeline__media {
  width: 100%;
  max-width: 360px;
}

.page-about .about-timeline__lead,
.page-about .about-scope__lead,
.page-about .about-check__lead,
.page-about .about-team__lead,
.page-about .about-misread__lead {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 0.9875rem;
  line-height: 1.85;
  color: rgba(20, 22, 26, 0.78);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  counter-reset: about-node;
}

.page-about .about-node {
  position: relative;
  display: grid;
  gap: 8px;
}

.page-about .about-node + .about-node {
  margin-top: 32px;
  padding-top: 32px;
  border-top: var(--about-line);
}

.page-about .about-node__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--neon);
  line-height: 1.4;
}

.page-about .about-node__title {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.5;
}

.page-about .about-node__text {
  margin: 0;
  max-width: 42em;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(20, 22, 26, 0.78);
}

.page-about .about-node__delta {
  margin: 4px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--blue-pale);
  max-width: 42em;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: rgba(20, 22, 26, 0.66);
}

.page-about .about-node__delta-key {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--blue-sub);
}

/* ============ 统计口径表 ============ */
.page-about .about-scope {
  padding: var(--about-pad-y) 0;
  border-bottom: var(--about-line);
  background: linear-gradient(180deg, rgba(168, 198, 218, 0.1) 0%, rgba(244, 241, 234, 0) 70%);
}

.page-about .about-table__scroll {
  margin-top: 26px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: var(--about-line);
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}

.page-about .about-table {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.page-about .about-table caption {
  caption-side: top;
  text-align: left;
  padding: 14px 18px;
  border-bottom: var(--about-line);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: rgba(20, 22, 26, 0.58);
}

.page-about .about-table thead th {
  background: var(--green-deep);
  color: var(--paper);
  text-align: left;
  padding: 12px 18px;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.page-about .about-table tbody th,
.page-about .about-table tbody td {
  padding: 14px 18px;
  border-top: var(--about-line);
  vertical-align: top;
  line-height: 1.75;
  color: rgba(20, 22, 26, 0.8);
  font-weight: 400;
}

.page-about .about-table tbody th {
  font-weight: 700;
  color: var(--blue-ink);
  white-space: nowrap;
}

.page-about .about-table tbody tr:hover {
  background: rgba(168, 198, 218, 0.14);
}

.page-about .about-scope__foot {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  line-height: 1.8;
  color: rgba(20, 22, 26, 0.6);
}

/* ============ 三级校对 ============ */
.page-about .about-check {
  padding: var(--about-pad-y) 0;
  border-bottom: var(--about-line);
}

.page-about .about-flow {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-flow__step {
  display: grid;
  gap: 12px;
  padding: 22px 20px 24px;
  border: var(--about-line);
  border-left: 3px solid var(--blue-pale);
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}

.page-about .about-flow__step:nth-child(2) {
  border-left-color: var(--neon);
}

.page-about .about-flow__step:nth-child(3) {
  border-left-color: var(--yellow);
}

.page-about .about-flow__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--blue-sub);
}

.page-about .about-flow__title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: 0.05em;
}

.page-about .about-flow__desc {
  margin: 6px 0 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(20, 22, 26, 0.78);
}

.page-about .about-flow__checks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-flow__checks li {
  position: relative;
  padding-left: 20px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(20, 22, 26, 0.76);
}

.page-about .about-flow__checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 1px;
  background: var(--blue-pale);
}

/* ============ 团队与分工 ============ */
.page-about .about-team {
  padding: var(--about-pad-y) 0;
  border-bottom: var(--about-line);
}

.page-about .about-team__grid {
  margin-top: 30px;
  display: grid;
  gap: 20px;
}

.page-about .about-team__card {
  display: grid;
  gap: 8px;
  padding: 22px 20px 24px;
  border: var(--about-line);
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}

.page-about .about-team__card--deep {
  background: var(--blue-ink);
  border-color: var(--blue-ink);
  color: var(--paper);
}

.page-about .about-team__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 11vw, 3.4rem);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--blue-ink);
}

.page-about .about-team__card--deep .about-team__count {
  color: var(--yellow);
}

.page-about .about-team__role {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: 0.06em;
}

.page-about .about-team__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(20, 22, 26, 0.76);
}

.page-about .about-team__card--deep .about-team__text {
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-team__link {
  justify-self: start;
  margin-top: 6px;
  padding-bottom: 2px;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--blue-sub);
  border-bottom: 1px solid rgba(47, 110, 158, 0.42);
}

.page-about .about-team__card--deep .about-team__link {
  color: var(--yellow);
  border-bottom-color: rgba(242, 178, 27, 0.5);
}

.page-about .about-team__link:hover {
  color: var(--blue-ink);
  border-bottom-color: var(--blue-ink);
}

.page-about .about-team__card--deep .about-team__link:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ============ 授权与合作生态 ============ */
.page-about .about-ecosystem {
  padding: var(--about-pad-y) 0;
  border-bottom: var(--about-line);
}

.page-about .about-ecosystem__grid {
  margin-top: 28px;
  display: grid;
  gap: 26px;
}

.page-about .about-ecosystem__media,
.page-about .about-ecosystem__media-small {
  width: 100%;
}

.page-about .about-ecosystem__text p {
  margin: 0 0 16px;
  font-size: 0.9875rem;
  line-height: 1.85;
  color: rgba(20, 22, 26, 0.8);
  max-width: 38em;
}

.page-about .about-ecosystem__text p:last-child {
  margin-bottom: 0;
  padding-left: 12px;
  border-left: 2px solid var(--neon);
  color: rgba(20, 22, 26, 0.72);
}

/* ============ 备案与合规 ============ */
.page-about .about-legal {
  padding: var(--about-pad-y) 0;
  border-bottom: var(--about-line);
}

.page-about .about-legal__panel {
  padding: 30px 22px 32px;
  border-radius: var(--radius);
  background: var(--indigo);
  color: var(--paper);
  box-shadow: var(--shadow-soft);
}

.page-about .about-legal__list {
  margin: 24px 0 0;
  padding: 0;
  border-top: var(--line-dark);
}

.page-about .about-legal__row {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: var(--line-dark);
}

.page-about .about-legal__row dt {
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: rgba(244, 241, 234, 0.58);
}

.page-about .about-legal__row dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-legal__row dd.num {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-about .about-legal__note {
  margin: 22px 0 0;
  max-width: 44em;
  font-size: 0.875rem;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.76);
}

.page-about .about-legal__links {
  margin: 18px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
}

.page-about .about-legal__links a {
  padding-bottom: 2px;
  text-decoration: none;
  color: var(--yellow);
  border-bottom: 1px solid rgba(242, 178, 27, 0.45);
}

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

.page-about .about-legal__links span {
  color: rgba(244, 241, 234, 0.4);
}

/* ============ 误读澄清 ============ */
.page-about .about-misread {
  padding: var(--about-pad-y) 0 56px;
}

.page-about .about-misread__list {
  margin-top: 26px;
  border-top: var(--about-line);
}

.page-about .about-misread__item {
  border-bottom: var(--about-line);
  background: #ffffff;
}

.page-about .about-misread__item summary {
  position: relative;
  padding: 17px 46px 17px 16px;
  list-style: none;
  cursor: pointer;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: 0.02em;
}

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

.page-about .about-misread__item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-misread__item[open] summary::after {
  content: "\2013";
}

.page-about .about-misread__item summary:hover {
  color: var(--blue-ink);
}

.page-about .about-misread__item p {
  margin: 0;
  padding: 0 16px 20px;
  max-width: 46em;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(20, 22, 26, 0.78);
}

.page-about .about-misread__route {
  margin: 26px 0 0;
  font-size: 0.875rem;
  line-height: 1.85;
  color: rgba(20, 22, 26, 0.7);
}

.page-about .about-misread__route a {
  padding-bottom: 1px;
  text-decoration: none;
  color: var(--blue-sub);
  border-bottom: 1px solid rgba(47, 110, 158, 0.42);
}

.page-about .about-misread__route a:hover {
  color: var(--blue-ink);
  border-bottom-color: var(--blue-ink);
}

/* ============ 焦点态 ============ */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-fact {
    padding: 20px 16px 22px;
  }

  .page-about .about-node {
    grid-template-columns: 72px minmax(0, 1fr);
    column-gap: 20px;
    align-items: start;
  }

  .page-about .about-node__code {
    grid-column: 1;
    grid-row: 1;
    padding-top: 5px;
  }

  .page-about .about-node__title,
  .page-about .about-node__text,
  .page-about .about-node__delta {
    grid-column: 2;
  }

  .page-about .about-node::after {
    content: "";
    position: absolute;
    left: 72px;
    top: 34px;
    bottom: -32px;
    width: 1px;
    background: rgba(168, 198, 218, 0.6);
  }

  .page-about .about-node:last-child::after {
    content: none;
  }

  .page-about .about-legal__panel {
    padding: 38px 36px 40px;
  }

  .page-about .about-legal__row {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-misread__item summary {
    padding: 20px 56px 20px 22px;
  }

  .page-about .about-misread__item summary::after {
    right: 22px;
  }

  .page-about .about-misread__item p {
    padding: 0 22px 24px;
  }
}

@media (min-width: 860px) {
  .page-about {
    --about-pad-y: 68px;
  }

  .page-about .about-hero {
    padding: 36px 0 60px;
  }

  .page-about .about-hero__pattern {
    top: -90px;
    right: -40px;
    width: 480px;
    height: 480px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-route__list {
    gap: 40px;
    overflow-x: visible;
  }

  .page-about .about-flow__step {
    grid-template-columns: 76px minmax(0, 1fr) minmax(0, 1.05fr);
    column-gap: 28px;
    align-items: start;
    padding: 26px 28px 28px;
  }

  .page-about .about-flow__code {
    grid-column: 1;
    font-size: 1.7rem;
  }

  .page-about .about-flow__main {
    grid-column: 2;
  }

  .page-about .about-flow__checks {
    grid-column: 3;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline__grid {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-timeline__media {
    max-width: none;
  }

  .page-about .about-timeline__body {
    padding-top: 4px;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
    align-items: start;
  }

  .page-about .about-team__card:nth-child(1) {
    grid-column: 1 / span 5;
  }

  .page-about .about-team__card:nth-child(2) {
    grid-column: 7 / span 4;
    margin-top: 48px;
  }

  .page-about .about-team__card:nth-child(3) {
    grid-column: 2 / span 6;
  }

  .page-about .about-team__card:nth-child(4) {
    grid-column: 9 / span 4;
    margin-top: 56px;
  }

  .page-about .about-ecosystem__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-ecosystem__media {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .page-about .about-ecosystem__text {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-ecosystem__media-small {
    grid-column: 2;
    grid-row: 2;
    max-width: 320px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__intro {
    font-size: 1.125rem;
  }

  .page-about .about-node__text {
    font-size: 0.9875rem;
  }
}

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