.page-about {
  --pa-rule: rgba(16, 22, 19, 0.14);
  --pa-rule-soft: rgba(16, 22, 19, 0.08);
  --pa-rule-dark: rgba(199, 249, 75, 0.20);
  --pa-body-text: #3A4A42;
  background: var(--paper-100);
  color: var(--ink-900);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.75;
  overflow-x: clip;
}

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

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

.page-about .pa-wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(18px, 5vw, 28px);
}

/* ---------- 封面 ---------- */

.page-about .pa-cover {
  position: relative;
  padding-block: clamp(24px, 4vw, 44px) clamp(32px, 5vw, 64px);
  background:
    radial-gradient(120% 86% at 92% -4%, rgba(199, 249, 75, 0.34) 0%, rgba(199, 249, 75, 0) 56%),
    var(--paper-100);
}

.page-about .pa-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(24px, 4vw, 50px);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--stand-600);
}

.page-about .pa-crumbs a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease;
}

.page-about .pa-crumbs a:hover {
  border-bottom-color: currentColor;
}

.page-about .pa-cover-grid {
  display: grid;
  gap: 34px;
}

@media (min-width: 900px) {
  .page-about .pa-cover-grid {
    grid-template-columns: minmax(0, 1fr) 288px;
    gap: 52px;
    align-items: end;
  }
}

.page-about .pa-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--stand-600);
}

.page-about .pa-eyebrow::before {
  content: "";
  width: 30px;
  height: 3px;
  border-radius: var(--r-pill);
  background: var(--lime-400);
}

.page-about .pa-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.35rem, 8.2vw, 5.6rem);
  line-height: 1.03;
  letter-spacing: -0.03em;
  color: var(--ink-900);
}

.page-about .pa-title em {
  font-style: normal;
  background: var(--lime-400);
  color: var(--ink-900);
  padding: 0 0.1em;
  border-radius: 8px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.page-about .pa-lead {
  margin: 24px 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 2.1vw, 1.2rem);
  line-height: 1.85;
  color: var(--pa-body-text);
}

.page-about .pa-cover-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .pa-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.page-about .pa-btn--solid {
  background: var(--ink-900);
  color: var(--lime-200);
}

.page-about .pa-btn--solid:hover {
  transform: translateY(-2px);
}

.page-about .pa-btn--ghost {
  background: transparent;
  border-color: rgba(16, 22, 19, 0.26);
  color: var(--ink-900);
}

.page-about .pa-btn--ghost:hover {
  border-color: var(--ink-900);
  background: rgba(16, 22, 19, 0.06);
}

.page-about .pa-cover-side {
  border-top: 3px solid var(--ink-900);
  padding-top: 20px;
}

.page-about .pa-vlabel {
  display: block;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.24em;
  color: var(--stand-600);
}

.page-about .pa-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 22px;
}

@media (min-width: 900px) {
  .page-about .pa-facts {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }
}

.page-about .pa-fact {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .pa-fact-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .pa-fact-label {
  font-size: var(--fs-12);
  line-height: 1.55;
  color: var(--stand-600);
}

/* ---------- 主体框架 ---------- */

.page-about .pa-body {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(18px, 5vw, 28px);
  padding-bottom: clamp(48px, 7vw, 88px);
  display: grid;
  gap: 0;
}

.page-about .pa-rail {
  padding-block: clamp(28px, 4vw, 40px) 12px;
}

.page-about .pa-rail-title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--pa-rule);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--stand-600);
}

.page-about .pa-rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .pa-rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .pa-rail-link {
  display: block;
  white-space: nowrap;
  padding: 8px 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--pa-rule);
  font-size: var(--fs-14);
  color: var(--stand-600);
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.page-about .pa-rail-link:hover {
  background: rgba(16, 22, 19, 0.06);
  border-color: rgba(16, 22, 19, 0.34);
  color: var(--ink-900);
}

@media (min-width: 1000px) {
  .page-about .pa-body {
    grid-template-columns: minmax(0, 1fr) 224px;
    column-gap: 56px;
  }

  .page-about .pa-flow {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .pa-rail {
    grid-column: 2;
    grid-row: 1;
    align-self: start;
    position: sticky;
    top: 24px;
    padding-block: clamp(40px, 6vw, 72px) 0;
  }

  .page-about .pa-rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .pa-rail-link {
    white-space: normal;
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 2px solid var(--pa-rule);
    border-radius: 0;
  }

  .page-about .pa-rail-link:hover {
    background: transparent;
    border-left-color: var(--ink-900);
    color: var(--ink-900);
  }
}

/* ---------- 通用区块 ---------- */

.page-about .pa-sec {
  padding-block: clamp(38px, 5.5vw, 68px);
  border-top: 1px solid var(--pa-rule-soft);
}

.page-about .pa-flow > .pa-sec:first-child {
  border-top: 0;
}

.page-about .pa-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--stand-600);
}

.page-about .pa-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.7rem, 4.6vw, 2.75rem);
  line-height: 1.16;
  letter-spacing: -0.025em;
  color: var(--ink-900);
}

.page-about .pa-intro {
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--pa-body-text);
}

.page-about .pa-intro + .pa-intro {
  margin-top: 14px;
}

.page-about .pa-sec--dark {
  position: relative;
  overflow: hidden;
  margin-block: clamp(24px, 3.5vw, 40px);
  padding: clamp(24px, 4.4vw, 52px);
  border-top: 0;
  border-radius: var(--r-lg);
  background: var(--night-800);
  color: var(--text-on-dark);
}

.page-about .pa-sec--dark::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, rgba(199, 249, 75, 0) 0%, rgba(199, 249, 75, 0.7) 50%, rgba(199, 249, 75, 0) 100%);
}

.page-about .pa-sec--dark .pa-kicker {
  color: var(--lime-400);
}

.page-about .pa-sec--dark .pa-h2 {
  color: var(--paper-100);
}

.page-about .pa-sec--dark .pa-intro {
  color: var(--text-on-dark);
}

/* ---------- 图片 ---------- */

.page-about .pa-figure {
  margin: 28px 0 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--stand-600);
}

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

.page-about .pa-figure--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .pa-figure--tall img {
  aspect-ratio: 4 / 3;
}

/* ---------- 时间轴 ---------- */

.page-about .pa-track {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

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

.page-about .pa-node {
  position: relative;
  padding-top: 22px;
  border-top: 2px solid var(--pa-rule-dark);
}

.page-about .pa-node::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lime-400);
  box-shadow: 0 0 0 4px rgba(199, 249, 75, 0.16);
}

.page-about .pa-node-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--lime-400);
}

.page-about .pa-node h3 {
  margin: 0 0 10px;
  font-size: var(--fs-20);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-about .pa-node p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--text-on-dark);
}

/* ---------- 四条内容线 ---------- */

.page-about .pa-lines {
  margin-top: 30px;
}

.page-about .pa-line {
  display: grid;
  gap: 10px;
  padding-block: 26px;
  border-top: 1px solid var(--pa-rule);
}

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

@media (min-width: 760px) {
  .page-about .pa-line {
    grid-template-columns: 66px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
    padding-block: 36px;
  }
}

.page-about .pa-line-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.24em;
  color: var(--stand-600);
}

@media (min-width: 760px) {
  .page-about .pa-line-tag {
    writing-mode: vertical-rl;
    letter-spacing: 0.28em;
    padding-top: 4px;
  }
}

.page-about .pa-line-body h3 {
  margin: 0 0 10px;
  font-size: var(--fs-20);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .pa-line-body p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--pa-body-text);
}

.page-about .pa-line-body .pa-line-note {
  display: inline-block;
  margin-top: 14px;
  padding: 6px 14px;
  border: 1px dashed rgba(16, 22, 19, 0.26);
  border-radius: var(--r-pill);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--stand-600);
}

.page-about .pa-line-note--wide {
  display: inline-block;
  margin-top: 18px;
  padding: 8px 16px;
  border: 1px dashed rgba(16, 22, 19, 0.26);
  border-radius: var(--r-pill);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--stand-600);
}

/* ---------- 团队 ---------- */

.page-about .pa-team {
  margin-top: 30px;
  display: grid;
  gap: 16px;
}

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

.page-about .pa-team-card {
  padding: 24px 22px;
  border: 1px solid var(--pa-rule-dark);
  border-radius: var(--r-md);
  background: var(--stand-600);
  transition: border-color 180ms ease, transform 180ms ease;
}

.page-about .pa-team-card:hover {
  border-color: rgba(199, 249, 75, 0.5);
  transform: translateY(-3px);
}

.page-about .pa-team-icon {
  display: block;
  width: 34px;
  height: 34px;
  margin-bottom: 16px;
  color: var(--lime-400);
}

.page-about .pa-team-card h3 {
  margin: 0 0 8px;
  font-size: var(--fs-20);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-about .pa-team-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--text-on-dark);
}

.page-about .pa-team-tags {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .pa-team-tags li {
  padding: 4px 11px;
  border: 1px solid rgba(199, 249, 75, 0.24);
  border-radius: var(--r-pill);
  background: rgba(199, 249, 75, 0.1);
  font-size: var(--fs-12);
  color: var(--lime-200);
}

.page-about .pa-rota {
  list-style: none;
  margin: 26px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--pa-rule-dark);
  display: grid;
  gap: 12px;
}

.page-about .pa-rota-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-on-dark);
}

.page-about .pa-rota-item strong {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--lime-400);
}

/* ---------- 版本迭代 ---------- */

.page-about .pa-vers {
  margin-top: 30px;
  display: grid;
  gap: 18px;
}

@media (min-width: 780px) {
  .page-about .pa-vers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }
}

.page-about .pa-ver {
  padding: 26px 24px;
  border: 1px solid var(--pa-rule);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.45);
}

.page-about .pa-ver--now {
  border-color: var(--ink-900);
  background: var(--paper-100);
  box-shadow: 8px 8px 0 rgba(199, 249, 75, 0.85);
}

.page-about .pa-ver-tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--stand-600);
}

.page-about .pa-ver--now .pa-ver-tag {
  color: var(--ink-900);
}

.page-about .pa-ver h3 {
  margin: 0 0 12px;
  font-size: var(--fs-20);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .pa-ver p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--pa-body-text);
}

.page-about .pa-goals {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .pa-goals li {
  padding: 9px 18px;
  border-radius: var(--r-pill);
  background: var(--ink-900);
  color: var(--lime-200);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* ---------- 辽宁 ---------- */

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

@media (min-width: 840px) {
  .page-about .pa-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 44px;
    align-items: center;
  }
}

.page-about .pa-split .pa-figure {
  margin-top: 0;
}

/* ---------- 内容来源 ---------- */

.page-about .pa-srcs {
  margin-top: 30px;
  display: grid;
  gap: 22px;
}

@media (min-width: 760px) {
  .page-about .pa-srcs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}

.page-about .pa-src {
  padding-top: 16px;
  border-top: 3px solid var(--ink-900);
}

.page-about .pa-src h3 {
  margin: 0 0 10px;
  font-size: var(--fs-20);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .pa-src p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--pa-body-text);
}

.page-about .pa-stats {
  list-style: none;
  margin: 34px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--pa-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
}

@media (min-width: 760px) {
  .page-about .pa-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .pa-stat-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .pa-stat-label {
  display: block;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--stand-600);
}

/* ---------- 结尾入口 ---------- */

.page-about .pa-cta {
  margin-bottom: 0;
}

.page-about .pa-cta-links {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .pa-cta-links a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid rgba(199, 249, 75, 0.35);
  border-radius: var(--r-pill);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lime-200);
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease;
}

.page-about .pa-cta-links a:hover {
  background: rgba(199, 249, 75, 0.14);
  border-color: var(--lime-400);
}

/* ---------- 窄屏兜底 ---------- */

@media (max-width: 460px) {
  .page-about .pa-facts {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .page-about .pa-stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .pa-cover-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .pa-btn {
    justify-content: center;
  }

  .page-about .pa-ver--now {
    box-shadow: 5px 5px 0 rgba(199, 249, 75, 0.85);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pa-btn,
  .page-about .pa-rail-link,
  .page-about .pa-team-card,
  .page-about .pa-cta-links a {
    transition: none;
  }

  .page-about .pa-btn--solid:hover,
  .page-about .pa-team-card:hover {
    transform: none;
  }
}