.page-about {
  --about-index-w: 172px;
  --about-soft: rgba(244, 241, 232, 0.8);
  --about-dim: rgba(244, 241, 232, 0.7);
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .breadcrumbs {
  padding-top: clamp(16px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(12px, 2.2vw, 20px);
  padding: clamp(30px, 5vw, 62px) 0 clamp(30px, 4.4vw, 52px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(130% 100% at 92% -10%, rgba(31, 122, 77, 0.34), transparent 58%),
    radial-gradient(90% 80% at 2% 120%, rgba(111, 91, 214, 0.16), transparent 62%),
    linear-gradient(180deg, var(--panel), var(--ink) 90%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 280px;
  height: 280px;
  border: 1px solid var(--line);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 34px;
  top: -34px;
  width: 150px;
  height: 150px;
  border: 1px solid rgba(28, 74, 56, 0.7);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(22px, 4vw, 46px);
  align-items: end;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 7vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 14px 0 18px;
  color: var(--paper);
}

.page-about .about-hero__lede {
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.8;
  color: var(--paper);
  margin: 0 0 14px;
  max-width: 60ch;
}

.page-about .about-hero__sub {
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-dim);
  margin: 0;
  max-width: 62ch;
}

.page-about .about-hero__stamp {
  position: relative;
  justify-self: start;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 22px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(7, 30, 22, 0.6);
}

.page-about .about-hero__stamp::after {
  content: "";
  position: absolute;
  right: 14px;
  top: 14px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--red);
}

.page-about .about-hero__stamp-num {
  font-family: var(--font-mono);
  font-weight: 200;
  font-size: clamp(56px, 9vw, 100px);
  line-height: 0.86;
  letter-spacing: -0.04em;
  color: var(--amber);
}

.page-about .about-hero__stamp-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figures li {
  background: var(--ink);
  padding: 15px 16px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-figures strong {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1;
  color: var(--amber);
}

.page-about .about-figures span {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--slate);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
  padding-top: clamp(30px, 4.6vw, 56px);
}

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--slate);
  margin: 0 0 12px;
}

.page-about .about-index ol {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index ol::-webkit-scrollbar {
  display: none;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--slate);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-index a:hover {
  color: var(--paper);
  border-color: var(--amber);
  background: rgba(242, 178, 51, 0.08);
}

.page-about .about-index a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  color: var(--paper);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-block: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--line);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 10px 0 16px;
  max-width: 22ch;
}

.page-about .about-sec p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-soft);
  margin: 0 0 14px;
}

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

.page-about .about-sec a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 192, 0.4);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

.page-about .about-sec a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

.page-about .about-narrow {
  max-width: 48ch;
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  margin-top: 20px;
}

.page-about .about-split__text {
  min-width: 0;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-figure--square img {
  aspect-ratio: 1 / 1;
}

.page-about .about-figure figcaption,
.page-about .about-turf figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--slate);
  padding: 10px 14px;
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-quote {
  margin: 20px 0 0;
  padding: 16px 20px;
  border-left: 3px solid var(--turf);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(90deg, rgba(31, 122, 77, 0.22), rgba(31, 122, 77, 0));
  color: var(--paper);
  font-size: 16px;
  line-height: 1.75;
}

/* ---------- 里程碑 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 26px 0 0;
  padding: 0 0 0 22px;
  display: grid;
  gap: 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--amber);
}

.page-about .about-timeline__era {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin: 0 0 4px;
}

.page-about .about-timeline h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
  margin: 0 0 6px;
}

.page-about .about-timeline p {
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-dim);
  margin: 0;
}

.page-about .about-turf {
  position: relative;
  margin: clamp(24px, 3.6vw, 34px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

.page-about .about-turf img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 5;
  object-fit: cover;
  opacity: 0.76;
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 17px 19px;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-visible {
  transform: translateY(-2px);
  border-color: var(--amber);
  background: rgba(31, 122, 77, 0.18);
}

.page-about .about-role:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-role .about-role__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 5px;
}

.page-about .about-role .about-role__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin: 0 0 9px;
}

.page-about .about-role .about-role__desc {
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-dim);
  margin: 0;
}

/* ---------- 方法四块 ---------- */
.page-about .about-blocks {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-blocks li {
  background: var(--ink);
  padding: 15px 17px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  align-items: baseline;
}

.page-about .about-blocks__idx {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-blocks h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--paper);
  margin: 0;
}

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

/* ---------- 目录节奏 ---------- */
.page-about .about-cadence {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-cadence li {
  background: var(--panel);
  border-top: 2px solid var(--amber);
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 16px 18px;
}

.page-about .about-cadence__cycle {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin: 0 0 6px;
}

.page-about .about-cadence h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
  margin: 0 0 6px;
}

.page-about .about-cadence p:last-child {
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-dim);
  margin: 0;
}

/* ---------- 联系侧栏 ---------- */
.page-about .about-aside {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  background: linear-gradient(160deg, rgba(31, 122, 77, 0.24), rgba(14, 46, 34, 0.72));
}

.page-about .about-aside .about-aside__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber);
  margin: 0 0 10px;
}

.page-about .about-aside p {
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-soft);
  margin: 0 0 14px;
}

.page-about .about-aside .about-aside__action {
  margin: 0;
}

/* ---------- 页尾引导 ---------- */
.page-about .about-next {
  margin-top: clamp(24px, 4vw, 42px);
  padding-top: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--line);
}

.page-about .about-next h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 30px);
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0 0 12px;
}

.page-about .about-next p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-dim);
  margin: 0 0 18px;
}

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

.page-about .about-next__links a {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-next__links a span {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.page-about .about-next__links a:hover {
  transform: translateY(-2px);
  border-color: var(--amber);
  background: rgba(31, 122, 77, 0.2);
}

.page-about .about-next__links a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.55fr);
  }
}

@media (min-width: 880px) {
  .page-about .about-cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 26px 0 0;
    gap: 20px;
  }

  .page-about .about-timeline::before {
    left: 0;
    right: 0;
    top: 5px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .about-timeline__item::before {
    left: 0;
    top: -21px;
  }
}

@media (min-width: 940px) {
  .page-about .about-body {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
  }

  .page-about .about-index ol {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index a {
    display: flex;
    width: 100%;
    border: 0;
    border-radius: 0;
    padding: 9px 0 9px 14px;
    background: none;
    position: relative;
    white-space: normal;
  }

  .page-about .about-index a::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 7px;
    bottom: 7px;
    width: 2px;
    background: transparent;
    transition: background-color 0.18s var(--ease);
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    background: none;
    color: var(--paper);
  }

  .page-about .about-index a:hover::before,
  .page-about .about-index a:focus-visible::before {
    background: var(--amber);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-next__links a,
  .page-about .about-index a {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-role:focus-visible,
  .page-about .about-next__links a:hover {
    transform: none;
  }
}