.page-about {
  position: relative;
  padding-top: clamp(96px, 13vw, 132px);
  padding-bottom: clamp(64px, 10vw, 108px);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(28, 42, 58, 0.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28, 42, 58, 0.6) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.15) 70%, transparent);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.15) 70%, transparent);
}

.page-about > .wrap,
.page-about > section {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 32px);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--steel);
}

.page-about .breadcrumb a {
  color: var(--index);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--paper);
}

/* ---------- 首屏：左窄右宽 ---------- */

.about-hero {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: start;
}

.about-hero__spine {
  order: 2;
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
  align-content: start;
  padding-left: 16px;
  border-left: 1px solid var(--steel);
}

.about-hero__body {
  order: 1;
  min-width: 0;
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 8vw, 4.4rem);
  line-height: 0.98;
  letter-spacing: -0.01em;
  margin: 0.2em 0 0.36em;
  color: var(--paper);
}

.page-about .lede {
  color: var(--paper);
  font-size: clamp(1.02rem, 1.6vw, 1.18rem);
  line-height: 1.8;
  max-width: 38ch;
}

.about-hero__text {
  margin-top: clamp(18px, 2.6vw, 26px);
  max-width: 46ch;
}

.about-hero__text p {
  margin: 0 0 0.9em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--rock);
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

.about-hero__strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: clamp(22px, 3.2vw, 30px);
  padding-top: 14px;
  border-top: var(--line);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.about-hero__strip b {
  color: var(--lime);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

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

.about-marks a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 4px 0;
  text-decoration: none;
  color: var(--rock);
  font-size: 13px;
  line-height: 1.5;
  border-bottom: 1px dotted transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.about-marks .num {
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--index);
  transition: color 160ms var(--ease);
}

.about-marks a:hover,
.about-marks a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--lime);
}

.about-marks a:hover .num,
.about-marks a:focus-visible .num {
  color: var(--lime);
}

.about-hero__figure {
  margin: 0;
  border: 1px solid var(--steel);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--ink-2);
}

.about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.06);
}

/* ---------- 通道与门户 ---------- */

.about-why,
.about-rules,
.about-timeline,
.about-crew,
.about-reach {
  margin-top: clamp(56px, 9vw, 104px);
}

.page-about .section-head {
  margin-bottom: clamp(20px, 3.4vw, 34px);
}

.about-why__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
}

.about-why__prose p {
  margin: 0 0 1em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--rock);
}

.about-why__prose p:first-child {
  color: var(--paper);
}

.about-why__paths {
  display: grid;
  gap: clamp(12px, 2vw, 16px);
  align-content: start;
}

.path-card {
  border: 1px solid var(--steel);
  border-radius: var(--r-md);
  background: var(--ink-2);
  padding: clamp(16px, 2.4vw, 22px);
}

.path-card--new {
  border-color: var(--lime-deep);
  background: linear-gradient(160deg, rgba(31, 107, 74, 0.28), var(--ink-2) 62%);
}

.path-card__label {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rock);
}

.path-card--new .path-card__label {
  color: var(--lime);
}

.path-card__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 8px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--rock);
}

.path-card__steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 8px;
  align-items: baseline;
}

.path-card__steps li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--steel);
}

.path-card--new .path-card__steps {
  color: var(--paper);
}

.path-card--new .path-card__steps li::before {
  color: var(--lime);
}

/* ---------- 三条原则 ---------- */

.rule-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.rule {
  display: grid;
  gap: 10px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-top: var(--line);
}

.rule:last-child {
  border-bottom: var(--line);
}

.rule__no {
  font-family: var(--font-num);
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.rule__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  letter-spacing: 0.01em;
  color: var(--paper);
}

.rule__body p {
  margin: 0 0 0.8em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--rock);
  max-width: 52ch;
}

.rule__proof {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dotted var(--steel);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--index);
}

.rule__proof span {
  padding: 2px 7px;
  border: 1px solid var(--clay);
  border-radius: var(--r-sm);
  color: var(--clay);
  font-size: 10px;
  letter-spacing: 0.14em;
}

/* ---------- 时间轴 ---------- */

.about-timeline__figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
  border: 1px solid var(--steel);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-2);
}

.about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.05);
}

.about-timeline__figure figcaption {
  padding: 10px 16px 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--rock);
  border-top: 1px solid var(--steel);
}

.about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 2.6vw, 26px);
}

.about-node {
  position: relative;
  padding-left: 24px;
  border-left: 1px solid var(--steel);
}

.about-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--lime);
  transition: background 180ms var(--ease), transform 180ms var(--ease);
}

.about-node:hover::before,
.about-node:focus-within::before {
  background: var(--lime);
  transform: scale(1.25);
}

.about-node__year {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.about-node h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--paper);
}

.about-node p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rock);
}

.about-node__note {
  display: inline-block;
  margin: 0;
  padding: 4px 9px;
  border: 1px solid var(--steel);
  border-radius: var(--r-sm);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--index);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.about-node:hover .about-node__note {
  border-color: var(--lime-deep);
  color: var(--paper);
}

/* ---------- 团队 ---------- */

.about-crew__grid {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-bottom: clamp(20px, 3vw, 30px);
}

.about-crew__figure {
  margin: 0;
  border: 1px solid var(--steel);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-2);
}

.about-crew__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.75) contrast(1.08) brightness(0.92);
}

.crew-hub {
  border-left: 2px solid var(--lime-deep);
  padding: 4px 0 4px clamp(14px, 2vw, 20px);
}

.crew-hub__label {
  margin: 0;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rock);
}

.crew-hub__num {
  margin: 8px 0 6px;
  font-family: var(--font-num);
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  line-height: 0.95;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.crew-hub__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rock);
  max-width: 34ch;
}

.crew-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}

.crew-card {
  position: relative;
  padding: clamp(16px, 2.4vw, 22px);
  padding-top: calc(clamp(16px, 2.4vw, 22px) + 6px);
  background: var(--ink-2);
  border: 1px solid var(--steel);
  border-radius: var(--r-md);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.crew-card::before {
  content: "";
  position: absolute;
  left: clamp(16px, 2.4vw, 22px);
  top: -1px;
  width: 26px;
  height: 3px;
  background: var(--lime);
}

.crew-card:hover {
  transform: translateY(-3px);
  border-color: var(--index);
}

.crew-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 1.9vw, 1.18rem);
  color: var(--paper);
}

.crew-card h3 .num {
  font-family: var(--font-num);
  font-size: 0.95em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.crew-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--rock);
}

/* ---------- 覆盖 ---------- */

.about-reach__grid {
  display: grid;
  gap: clamp(12px, 2vw, 18px);
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.reach-block {
  border-top: 1px solid var(--steel);
  padding-top: 12px;
}

.reach-block__num {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.reach-block p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--rock);
}

.reach-block:nth-child(2) .reach-block__num {
  color: var(--index);
}

.reach-block:nth-child(5) .reach-block__num {
  color: var(--flame);
}

.about-reach__note {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 14px 0 0;
  border-top: 1px dotted var(--steel);
  font-size: 14px;
  line-height: 1.85;
  color: var(--rock);
  max-width: 60ch;
}

/* ---------- 收尾 ---------- */

.about-next {
  margin-top: clamp(56px, 9vw, 104px);
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--steel);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(255, 90, 43, 0.14), transparent 58%),
    var(--ink-2);
}

.about-next h2 {
  margin: 0.16em 0 0.5em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  line-height: 1.1;
  color: var(--paper);
}

.about-next p {
  margin: 0 0 1em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--rock);
  max-width: 54ch;
}

.about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 2.6vw, 24px);
}

/* ---------- 桌面 ---------- */

@media (min-width: 760px) {
  .about-why__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .rule {
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: clamp(18px, 3vw, 36px);
    align-items: start;
  }

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

@media (min-width: 900px) {
  .about-hero {
    grid-template-columns: minmax(170px, 3.4fr) minmax(0, 8.6fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .about-hero__spine {
    order: 1;
  }

  .about-hero__body {
    order: 2;
  }

  .about-marks {
    position: sticky;
    top: 108px;
  }

  .about-why__paths {
    padding-top: 6px;
  }

  .about-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 28px);
    padding-top: 34px;
    border-top: 1px solid var(--steel);
  }

  .about-node {
    padding-left: 0;
    border-left: 0;
  }

  .about-node::before {
    left: 0;
    top: -39px;
  }

  .about-crew__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

  .about-crew__figure img {
    aspect-ratio: 5 / 4;
  }
}

@media (min-width: 1080px) {
  .about-next__actions {
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-marks a,
  .about-marks .num,
  .about-node::before,
  .about-node__note,
  .crew-card {
    transition: opacity 120ms linear;
  }

  .crew-card:hover {
    transform: none;
  }

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