.page-about {
  --about-line: 1px solid var(--line);
  --about-soft: rgba(143, 166, 193, 0.14);
  padding-bottom: clamp(48px, 7vw, 88px);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: clamp(14px, 2.4vw, 22px);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 44px) 0 clamp(44px, 6.5vw, 80px);
  border-bottom: var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -18% -12% auto -12%;
  height: 78%;
  pointer-events: none;
  background:
    radial-gradient(58% 68% at 20% 34%, rgba(255, 107, 26, 0.13), transparent 72%),
    radial-gradient(52% 62% at 84% 8%, rgba(53, 224, 138, 0.08), transparent 72%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
}

.page-about .about-hero__copy h1 {
  margin: 12px 0 0;
  max-width: 14ch;
  font-size: clamp(34px, 6.4vw, 76px);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-hero__copy .lede {
  margin-top: clamp(16px, 2.4vw, 22px);
  max-width: 46rem;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 36px);
  margin-top: clamp(22px, 3.2vw, 34px);
  padding-top: clamp(16px, 2.4vw, 22px);
  border-top: var(--about-line);
}

.page-about .about-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-meta__k {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--snow);
  letter-spacing: -0.03em;
}

.page-about .about-meta__v {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  box-shadow: var(--shadow);
  border: var(--about-line);
}

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

  .page-about .about-hero__figure {
    transform: translateY(clamp(10px, 2vw, 26px));
  }
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline__head {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  align-items: end;
}

@media (min-width: 820px) {
  .page-about .about-timeline__head {
    grid-template-columns: minmax(0, 1fr) 240px;
  }
}

.page-about .about-chart {
  width: 100%;
  max-width: 240px;
  height: auto;
  opacity: 0.9;
}

.page-about .about-chart__line {
  stroke-dasharray: 320;
  stroke-dashoffset: 0;
}

.page-about .about-track {
  position: relative;
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(22px, 3.2vw, 34px);
}

.page-about .about-track__item {
  position: relative;
  display: grid;
  gap: 10px;
  padding-left: 22px;
  border-left: var(--about-line);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 15px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 1px var(--line);
  transition: background var(--dur) ease, box-shadow var(--dur) ease;
}

.page-about .about-track__item:hover::before,
.page-about .about-track__item:focus-within::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 26, 0.16);
}

.page-about .about-track__year {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: fit-content;
  text-decoration: none;
  color: var(--snow);
  border-bottom: 1px solid transparent;
  transition: transform var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-track__year:hover,
.page-about .about-track__year:focus-visible {
  transform: translateX(2px);
  border-bottom-color: var(--orange);
}

.page-about .about-track__year .num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.6vw, 50px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  transition: color var(--dur) ease;
}

.page-about .about-track__year:hover .num {
  color: var(--orange);
}

.page-about .about-track__v {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-track__body {
  padding: clamp(16px, 2.4vw, 24px);
  display: grid;
  gap: 8px;
  transition: border-color var(--dur) ease, transform var(--dur) ease;
}

.page-about .about-track__body p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
  max-width: 46rem;
}

.page-about .about-track__item:hover .about-track__body {
  border-color: rgba(255, 107, 26, 0.5);
  transform: translateY(-2px);
}

@media (min-width: 860px) {
  .page-about .about-track::before {
    content: "";
    position: absolute;
    top: 6px;
    bottom: 18px;
    left: 196px;
    width: 1px;
    background: linear-gradient(180deg, rgba(255, 107, 26, 0.55), var(--line) 14%, var(--line) 86%, rgba(53, 224, 138, 0.45));
  }

  .page-about .about-track__item {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 74px;
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-track__item::before {
    left: 193px;
    top: 18px;
  }

  .page-about .about-track__year {
    text-align: right;
    align-items: flex-end;
    padding-top: 4px;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 48px);
  align-items: start;
}

.page-about .about-team__figure {
  margin: 0;
  border: var(--about-line);
  box-shadow: var(--shadow);
}

.page-about .about-team__body h2 {
  margin-top: 8px;
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  display: grid;
  gap: 4px;
  padding: 16px;
  border: var(--about-line);
  background: linear-gradient(180deg, rgba(11, 31, 56, 0.92), rgba(7, 20, 38, 0.55));
  transition: border-color var(--dur) ease, transform var(--dur) ease;
}

.page-about .about-role:hover {
  border-color: rgba(53, 224, 138, 0.5);
  transform: translateY(-2px);
}

.page-about .about-role__n {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-role__t {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--snow);
}

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

@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 940px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: center;
  }
}

/* ---------- 流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  padding: 20px 18px 18px;
  border-top: 2px solid var(--orange);
  background: rgba(11, 31, 56, 0.55);
  display: grid;
  gap: 6px;
}

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

.page-about .about-step:nth-child(3) {
  border-top-color: var(--green);
}

.page-about .about-step__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-step h3 {
  margin: 0;
}

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

.page-about .about-process__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--green);
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 48rem;
}

@media (min-width: 820px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 数据源 ---------- */
.page-about .about-sources__grid {
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-source {
  display: grid;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 28px);
  align-content: start;
}

.page-about .about-source .badge {
  justify-self: start;
}

.page-about .about-source h3 {
  margin: 0;
}

.page-about .about-source p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 40rem;
}

.page-about .about-sources__link {
  margin: clamp(16px, 2.6vw, 22px) 0 0;
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-sources__link a {
  color: var(--snow);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
  padding-bottom: 1px;
  transition: color var(--dur) ease;
}

.page-about .about-sources__link a:hover {
  color: var(--orange);
}

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

/* ---------- 覆盖 ---------- */
.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3.4vw, 34px);
  background: var(--line);
  border: var(--about-line);
}

.page-about .about-reach__item {
  display: grid;
  gap: 6px;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--ink);
}

.page-about .about-reach__n {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.8vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--snow);
  letter-spacing: -0.03em;
}

.page-about .about-reach__n em {
  font-style: normal;
  font-size: 0.48em;
  color: var(--orange);
  margin-left: 3px;
  letter-spacing: 0;
}

.page-about .about-reach__k {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

@media (min-width: 860px) {
  .page-about .about-reach__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-cta__inner {
  display: grid;
  gap: clamp(20px, 3.4vw, 36px);
  padding: clamp(24px, 4vw, 44px);
  border: var(--about-line);
  background:
    linear-gradient(120deg, rgba(255, 107, 26, 0.1), transparent 46%),
    rgba(11, 31, 56, 0.72);
  align-items: center;
}

.page-about .about-cta__inner .prose {
  margin-top: 10px;
}

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

@media (min-width: 840px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}