.page-about {
  --about-rail-w: 200px;
  --about-flow-gap: clamp(56px, 6.5vw, 108px);
  --about-line: rgba(26, 36, 54, .9);
  padding-bottom: clamp(72px, 9vw, 140px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 3.5vw, 52px);
}

.page-about .crumb {
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--ink-800);
  background:
    radial-gradient(130% 150% at 0% 0%, rgba(53, 224, 208, .11), transparent 46%),
    linear-gradient(180deg, var(--ink-900), var(--ink-950));
  padding: clamp(28px, 4.4vw, 62px) clamp(22px, 4vw, 68px) clamp(30px, 4vw, 54px);
  overflow: hidden;
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 8px;
  background: repeating-linear-gradient(to bottom, var(--ink-800) 0 1px, transparent 1px 16px);
  opacity: .85;
  pointer-events: none;
}

.page-about .about-hero__frame::before { left: 0; }
.page-about .about-hero__frame::after { right: 0; }

.page-about .about-hero__frame .eyebrow {
  color: var(--signal-cyan);
}

.page-about .about-hero__frame h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 5.2vw, 58px);
  line-height: 1.14;
  letter-spacing: .02em;
  color: var(--rock-100);
  margin: 14px 0 0;
  max-width: 20em;
}

.page-about .about-hero__frame h1 .hl {
  display: inline;
  background: linear-gradient(180deg, transparent 62%, rgba(53, 224, 208, .28) 62%);
}

.page-about .about-hero__frame .lede {
  margin-top: 22px;
  max-width: 34em;
  color: var(--rock-400);
  font-size: clamp(15px, 1.5vw, 17px);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(28px, 3.6vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ink-800);
  border: 1px solid var(--ink-800);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-stats li {
  background: var(--ink-950);
  padding: 18px 16px 20px;
  display: grid;
  align-content: start;
}

.page-about .about-stat__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal-cyan);
}

.page-about .about-stats li:nth-child(2) .about-stat__value { color: var(--rock-100); }
.page-about .about-stats li:nth-child(3) .about-stat__value { color: var(--signal-orange); }
.page-about .about-stats li:nth-child(4) .about-stat__value { color: var(--moss); }

.page-about .about-stat__unit {
  margin-top: 6px;
  font-size: 13px;
  color: var(--rock-100);
}

.page-about .about-stat__label {
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--rock-400);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  margin-top: clamp(48px, 6vw, 92px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4vw, 60px);
}

.page-about .about-rail {
  border-left: 1px solid var(--ink-800);
  padding-left: 18px;
}

.page-about .about-rail .eyebrow {
  color: var(--rock-400);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-rail__list a {
  display: inline-block;
  font-size: 14px;
  color: var(--rock-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--signal-cyan);
  border-bottom-color: var(--signal-cyan);
}

.page-about .about-rail__note {
  margin: 22px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--rock-400);
}

.page-about .about-rail__note a {
  color: var(--signal-orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 47, .45);
}

.page-about .about-rail__note a:hover,
.page-about .about-rail__note a:focus-visible {
  border-bottom-color: var(--signal-orange);
}

/* ---------- 画板 ---------- */
.page-about .about-flow {
  display: grid;
  gap: var(--about-flow-gap);
  min-width: 0;
}

.page-about .panel {
  border: 0;
  border-top: 1px solid var(--ink-800);
  background: transparent;
  padding: clamp(26px, 3.4vw, 42px) 0 0;
  border-radius: 0;
  box-shadow: none;
}

.page-about .panel__head {
  display: grid;
  gap: 10px;
}

.page-about .panel__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--rock-400);
}

.page-about .panel__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.25;
  letter-spacing: .01em;
  color: var(--rock-100);
  margin: 0;
}

.page-about .panel__body {
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .panel__body > p {
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--rock-400);
}

.page-about .panel__body > p + p {
  margin-top: 14px;
}

.page-about .panel__body a {
  color: var(--signal-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .4);
}

.page-about .panel__body a:hover,
.page-about .panel__body a:focus-visible {
  border-bottom-color: var(--signal-cyan);
}

.page-about .about-more {
  margin-top: 22px;
  font-size: 14px;
}

/* 标签行 */
.page-about .tag-row {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* 图片容器 */
.page-about .about-figure {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
}

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

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(30px, 3.8vw, 48px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: clamp(26px, 3vw, 40px);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--clay), var(--moss) 55%, var(--signal-cyan-deep));
}

.page-about .timeline__item {
  position: relative;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--clay);
  transition: background var(--dur-mid) var(--ease-out), border-color var(--dur-mid) var(--ease-out);
}

.page-about .timeline__item--current::before {
  border-color: var(--signal-cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 208, .12);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  background: var(--signal-cyan);
  border-color: var(--signal-cyan);
}

.page-about .timeline__year {
  display: block;
  font-size: 20px;
  font-weight: 700;
  color: var(--clay);
  letter-spacing: .06em;
}

.page-about .timeline__item--current .timeline__year {
  color: var(--signal-cyan);
}

.page-about .timeline__card {
  margin-top: 8px;
  border-left: 2px solid var(--moss);
  background: linear-gradient(90deg, rgba(122, 143, 107, .12), transparent 70%);
  padding: 14px 18px 16px;
  transition: border-color var(--dur-mid) var(--ease-out), background var(--dur-mid) var(--ease-out);
}

.page-about .timeline__item:hover .timeline__card,
.page-about .timeline__item:focus-within .timeline__card {
  border-left-color: var(--signal-cyan);
  background: linear-gradient(90deg, rgba(53, 224, 208, .12), transparent 72%);
}

.page-about .timeline__card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--rock-100);
}

.page-about .timeline__card p {
  margin: 8px 0 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock-400);
}

/* ---------- 团队 ---------- */
.page-about .role-grid {
  margin-top: 24px;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .role {
  border: 1px solid var(--ink-800);
  border-left: 2px solid var(--moss);
  background: var(--ink-900);
  padding: 18px 18px 20px;
}

.page-about .role__code {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--moss);
}

.page-about .role h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--rock-100);
}

.page-about .role p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock-400);
}

.page-about .about-figure--team {
  margin-top: clamp(24px, 3vw, 36px);
}

/* ---------- 覆盖版图 ---------- */
.page-about .footprint {
  margin-top: 26px;
  display: grid;
  gap: 1px;
  background: var(--ink-800);
  border: 1px solid var(--ink-800);
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.page-about .footprint__cell {
  background: var(--ink-950);
  padding: 20px 16px 24px;
  outline: none;
  transition: background var(--dur-mid) var(--ease-out), box-shadow var(--dur-mid) var(--ease-out);
}

.page-about .footprint__cell:hover,
.page-about .footprint__cell:focus-visible {
  background: var(--ink-900);
  box-shadow: inset 0 -2px 0 0 var(--signal-cyan);
}

.page-about .footprint__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal-orange);
}

.page-about .footprint__name {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--rock-100);
}

.page-about .footprint__cell p {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock-400);
}

.page-about .cadence {
  margin-top: clamp(26px, 3.2vw, 40px);
  display: grid;
  gap: 1px;
  background: var(--ink-800);
  border: 1px solid var(--ink-800);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .cadence__item {
  background: var(--ink-900);
  padding: 20px 18px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 16px;
}

.page-about .cadence__num {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal-cyan);
}

.page-about .cadence__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--rock-400);
}

/* ---------- 长期做法 ---------- */
.page-about .creed {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: creed;
}

.page-about .creed li {
  position: relative;
  padding: 20px 0 22px 0;
  border-bottom: 1px dashed var(--ink-800);
}

.page-about .creed li:first-child {
  border-top: 1px dashed var(--ink-800);
}

.page-about .creed h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--rock-100);
  padding-left: 34px;
}

.page-about .creed h3::before {
  counter-increment: creed;
  content: "0" counter(creed);
  position: absolute;
  left: 0;
  top: 21px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--clay);
}

.page-about .creed p {
  margin: 8px 0 0;
  padding-left: 34px;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock-400);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--ink-800);
  border-bottom: 1px solid var(--ink-800);
  background: linear-gradient(120deg, rgba(255, 122, 47, .10), transparent 58%);
  padding: clamp(30px, 4vw, 52px) clamp(20px, 3vw, 40px);
}

.page-about .about-cta .eyebrow {
  color: var(--signal-orange);
}

.page-about .about-cta h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1.25;
  color: var(--rock-100);
}

.page-about .about-cta p {
  margin: 12px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock-400);
}

.page-about .about-cta__actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

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

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

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }
}

@media (max-width: 719px) {
  .page-about .about-hero__frame::before,
  .page-about .about-hero__frame::after {
    display: none;
  }

  .page-about .about-stat__value {
    font-size: 26px;
  }

  .page-about .cadence__num {
    font-size: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
  }
}