.page-about {
  --about-ink: var(--brown-900);
  --about-rule: rgba(42, 27, 20, 0.18);
  --about-rule-strong: rgba(42, 27, 20, 0.36);
  --about-muted: rgba(42, 27, 20, 0.64);
  background-color: var(--cream);
  color: var(--brown-900);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
  padding-bottom: clamp(40px, 6vw, 80px);
}

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

.page-about .breadcrumbs {
  padding-top: clamp(14px, 2.4vw, 26px);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--about-muted);
}

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

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

.page-about .breadcrumbs a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}

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

.page-about .about-link {
  color: var(--brand);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 90, 31, 0.45);
  transition: border-color var(--t), color var(--t);
}

.page-about .about-link:hover {
  color: var(--brown-900);
  border-bottom-color: var(--brown-900);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(16px, 2.6vw, 30px) 0 clamp(34px, 5vw, 62px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(42, 27, 20, 0.075) 1px, transparent 1.2px);
  background-size: 22px 22px;
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 48px);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--brand);
}

.page-about .about-kicker::before {
  content: "";
  width: 30px;
  height: 3px;
  background: var(--brand);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--brown-900);
}

.page-about .about-hero__lead {
  margin: 0 0 24px;
  max-width: 46ch;
  font-size: clamp(0.98rem, 1.3vw, 1.1rem);
  line-height: 1.9;
  color: rgba(42, 27, 20, 0.84);
}

.page-about .about-hero__meter {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--brown-900);
  border: 3px solid var(--brown-900);
}

.page-about .about-hero__meter li {
  background: var(--warm);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__meter-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--brand);
}

.page-about .about-hero__meter-txt {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--about-muted);
  line-height: 1.5;
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__figure {
  margin: 0;
  border: 3px solid var(--brown-900);
  background: var(--ink-950);
  box-shadow: 8px 8px 0 rgba(42, 27, 20, 0.14);
}

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

.page-about .about-hero__figure::after {
  content: "";
  display: block;
  height: 6px;
  background: linear-gradient(90deg, var(--brand) 0 50%, var(--data) 50% 100%);
}

.page-about .about-hero__cap {
  padding: 11px 14px 12px;
  background: var(--warm);
  border-top: 1px solid var(--about-rule);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--about-muted);
}

/* ---------- 章节头 ---------- */

.page-about .about-chapter {
  padding: clamp(36px, 5.4vw, 68px) 0;
  border-top: 3px solid var(--brown-900);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin-bottom: clamp(24px, 3.4vw, 42px);
}

.page-about .about-head__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--brand);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 3.1vw, 2.15rem);
  line-height: 1.16;
  color: var(--brown-900);
}

.page-about .about-head__lead {
  margin: 6px 0 0;
  max-width: 64ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--about-muted);
}

/* ---------- 01 正文 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-body__main p {
  margin: 0 0 18px;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(42, 27, 20, 0.86);
}

.page-about .about-body__main p:last-child {
  margin-bottom: 0;
}

.page-about .about-note {
  align-self: start;
  border: 3px solid var(--brown-900);
  border-top: 8px solid var(--brand);
  background: var(--warm);
  box-shadow: 6px 6px 0 rgba(42, 27, 20, 0.12);
  padding: 20px 20px 22px;
}

.page-about .about-note__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand);
}

.page-about .about-note p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: rgba(42, 27, 20, 0.8);
}

/* ---------- 02 横向时间线 ---------- */

.page-about .about-track {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 4px 4px 20px;
  margin: 0 -4px;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: var(--brand) rgba(42, 27, 20, 0.1);
  scrollbar-width: thin;
}

.page-about .about-track::-webkit-scrollbar {
  height: 8px;
}

.page-about .about-track::-webkit-scrollbar-track {
  background: rgba(42, 27, 20, 0.1);
}

.page-about .about-track::-webkit-scrollbar-thumb {
  background: var(--brand);
}

.page-about .about-track:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 4px;
}

.page-about .about-node {
  flex: 0 0 clamp(240px, 74vw, 318px);
  scroll-snap-align: start;
  background: var(--warm);
  border: 3px solid var(--brown-900);
  padding: 20px 18px 24px;
  transition: transform var(--t), box-shadow var(--t), border-color var(--t);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  transform: translate(-3px, -3px);
  border-color: var(--brand);
  box-shadow: 7px 7px 0 rgba(42, 27, 20, 0.18);
}

.page-about .about-node__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand);
}

.page-about .about-node__title {
  margin: 0 0 10px;
  font-size: 1.04rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--brown-900);
}

.page-about .about-node p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.8;
  color: rgba(42, 27, 20, 0.76);
}

.page-about .about-track__hint {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(42, 27, 20, 0.5);
}

/* ---------- 通用图片框 ---------- */

.page-about .about-figure {
  margin: clamp(22px, 3vw, 36px) 0 0;
  border: 3px solid var(--brown-900);
  background: var(--ink-800);
  box-shadow: 8px 8px 0 rgba(42, 27, 20, 0.14);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px 12px;
  background: var(--warm);
  border-top: 1px solid var(--about-rule);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--about-muted);
}

/* ---------- 03 覆盖与分区 ---------- */

.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.2vw, 44px);
}

.page-about .about-coverage__text p {
  margin: 0 0 18px;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(42, 27, 20, 0.86);
}

.page-about .about-coverage__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--brown-900);
  border: 3px solid var(--brown-900);
  align-self: start;
}

.page-about .about-figure-cell {
  background: var(--warm);
  padding: clamp(16px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background-color var(--t);
}

.page-about .about-figure-cell:hover {
  background: var(--brand);
}

.page-about .about-figure-cell__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 4.4vw, 2.8rem);
  font-weight: 700;
  line-height: 1;
  color: var(--brown-900);
  transition: color var(--t);
}

.page-about .about-figure-cell__label {
  font-size: 0.8rem;
  line-height: 1.55;
  color: rgba(42, 27, 20, 0.66);
  transition: color var(--t);
}

.page-about .about-figure-cell:hover .about-figure-cell__num,
.page-about .about-figure-cell:hover .about-figure-cell__label {
  color: var(--ink-950);
}

/* ---------- 04 团队 ---------- */

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

.page-about .about-team__card {
  background: var(--warm);
  border: 3px solid var(--brown-900);
  border-left: 8px solid var(--brand);
  padding: 22px 20px 20px;
  transition: transform var(--t), box-shadow var(--t);
}

.page-about .about-team__card:nth-child(even) {
  border-left-color: var(--data);
}

.page-about .about-team__card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 7px 7px 0 rgba(42, 27, 20, 0.16);
}

.page-about .about-team__name {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--brown-900);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: rgba(42, 27, 20, 0.76);
}

.page-about .about-team__tags {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  transition: opacity var(--t), transform var(--t);
}

.page-about .about-team__tags li {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  border: 1px solid var(--about-rule-strong);
  color: rgba(42, 27, 20, 0.7);
}

/* ---------- 05 合作生态 ---------- */

.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 38px);
}

.page-about .about-eco__body p {
  margin: 0 0 18px;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(42, 27, 20, 0.86);
}

.page-about .about-eco__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 2px solid var(--brown-900);
}

.page-about .about-eco__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-rule);
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(42, 27, 20, 0.8);
}

.page-about .about-eco__key {
  flex: 0 0 116px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--brand);
  padding-top: 3px;
}

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

.page-about .about-track--years {
  margin-top: clamp(28px, 3.6vw, 46px);
}

.page-about .about-year {
  flex: 0 0 clamp(196px, 62vw, 280px);
  scroll-snap-align: start;
  background: var(--brown-900);
  color: var(--warm);
  border: 3px solid var(--brown-900);
  padding: 22px 20px 24px;
  transition: transform var(--t), box-shadow var(--t);
}

.page-about .about-year:nth-child(2) {
  background: var(--ink-950);
  border-color: var(--ink-950);
}

.page-about .about-year:hover {
  transform: translate(-3px, -3px);
  box-shadow: 7px 7px 0 rgba(42, 27, 20, 0.22);
}

.page-about .about-year__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 4.4vw, 2.7rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--brand);
}

.page-about .about-year__txt {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(255, 248, 238, 0.86);
}

/* ---------- 06 下一步 ---------- */

.page-about .about-next {
  position: relative;
  overflow: hidden;
  margin-top: clamp(36px, 5vw, 64px);
  padding: clamp(46px, 6.6vw, 86px) 0;
  background: var(--ink-950);
  border-top: 3px solid var(--brown-900);
  color: var(--warm);
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  top: -35%;
  right: -12%;
  width: 56%;
  height: 170%;
  background: radial-gradient(circle at center, rgba(22, 224, 210, 0.17), transparent 62%);
  pointer-events: none;
}

.page-about .about-next::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -14%;
  width: 48%;
  height: 150%;
  background: radial-gradient(circle at center, rgba(255, 90, 31, 0.18), transparent 64%);
  pointer-events: none;
}

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

.page-about .about-head--invert .about-head__title {
  color: var(--warm);
}

.page-about .about-head--invert .about-head__lead {
  color: rgba(255, 248, 238, 0.66);
}

.page-about .about-roadmap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(255, 248, 238, 0.18);
  border: 1px solid rgba(255, 248, 238, 0.18);
}

.page-about .about-roadmap__item {
  background: var(--ink-800);
  padding: 22px 20px 26px;
  border-top: 4px solid var(--brand);
  transition: background-color var(--t);
}

.page-about .about-roadmap__item:nth-child(2) {
  border-top-color: var(--data);
}

.page-about .about-roadmap__item:nth-child(3) {
  border-top-color: var(--brand-soft);
}

.page-about .about-roadmap__item:hover {
  background: var(--ink-950);
}

.page-about .about-roadmap__title {
  margin: 0 0 12px;
  font-size: 1.04rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .about-roadmap__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: rgba(255, 248, 238, 0.72);
}

.page-about .about-next__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.4vw, 40px);
}

.page-about .about-next .btn--ghost {
  color: var(--warm);
  border-color: rgba(255, 248, 238, 0.42);
}

.page-about .about-next .btn--ghost:hover {
  border-color: var(--data);
  color: var(--data);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__meter {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-head {
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: 28px;
    row-gap: 4px;
  }

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

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

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

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    align-items: start;
  }

  .page-about .about-body {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

@media (hover: hover) and (min-width: 940px) {
  .page-about .about-team__tags {
    opacity: 0;
    transform: translateY(5px);
  }

  .page-about .about-team__card:hover .about-team__tags,
  .page-about .about-team__card:focus-within .about-team__tags {
    opacity: 1;
    transform: translateY(0);
  }

  .page-about .about-team__card {
    min-height: 216px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
  }

  .page-about .about-node:hover,
  .page-about .about-team__card:hover,
  .page-about .about-year:hover {
    transform: none;
  }
}