.page-about {
  background: var(--ink);
  color: var(--paper);
  padding-bottom: 8px;
}

.page-about .about-crumb-wrap {
  padding-top: 26px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 34px 0 60px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -200px;
  right: -160px;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle at 50% 50%, rgba(228, 0, 43, 0.36), rgba(122, 0, 22, 0) 68%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -200px;
  bottom: -240px;
  width: 560px;
  height: 560px;
  background: radial-gradient(circle at 50% 50%, rgba(0, 229, 208, 0.15), rgba(0, 229, 208, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero-title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(38px, 8.6vw, 80px);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero-em {
  font-style: normal;
  color: var(--cyan);
  border-bottom: 2px solid rgba(0, 229, 208, 0.4);
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}

.page-about .about-hero-stat {
  background: var(--ink-raise);
  padding: 15px 14px;
}

.page-about .about-hero-stat dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-hero-stat dd {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 21px;
  color: var(--cyan);
}

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

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

/* ---------- 时间带 ---------- */
.page-about .about-timeline {
  padding: 64px 0;
  background: linear-gradient(180deg, rgba(122, 0, 22, 0.28), rgba(10, 10, 15, 0) 42%);
}

.page-about .about-scale {
  display: flex;
  gap: 6px;
  margin: 28px 0 0;
  padding: 14px 0;
  list-style: none;
  overflow-x: auto;
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
  scrollbar-width: thin;
}

.page-about .about-scale li {
  flex: 0 0 auto;
}

.page-about .about-scale a {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--muted);
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-scale a:hover,
.page-about .about-scale a:focus-visible {
  border-color: var(--cyan);
  color: var(--paper);
  background: rgba(0, 229, 208, 0.07);
}

.page-about .about-scale a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-scale-year {
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-scale li.is-latest .about-scale-year {
  color: var(--lime);
}

.page-about .about-scale-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-stages {
  margin-top: 34px;
}

.page-about .about-stage {
  display: grid;
  gap: 10px;
  padding: 26px 0;
  border-bottom: 1px solid rgba(42, 42, 56, 0.72);
  scroll-margin-top: 110px;
}

.page-about .about-stage:first-child {
  border-top: 1px solid rgba(42, 42, 56, 0.72);
}

.page-about .about-stage-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-stage-year {
  font-family: var(--font-display);
  font-size: clamp(44px, 11vw, 88px);
  line-height: 0.84;
  letter-spacing: -0.03em;
  color: var(--grid-line);
  transition: color 0.35s var(--ease);
}

.page-about .about-stage:hover .about-stage-year {
  color: var(--red);
}

.page-about .about-stage-tag {
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid var(--lime);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .about-stage-body h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.page-about .about-stage-body p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 资料库 ---------- */
.page-about .about-library {
  padding: 64px 0;
  background: var(--ink-deep);
}

.page-about .about-lib-grid {
  display: grid;
  gap: 32px;
}

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

.page-about .about-lib-list {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid-line);
}

.page-about .about-lib-item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .about-lib-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-lib-item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .about-lib-note {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--red);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 字段 ---------- */
.page-about .about-fields {
  padding: 64px 0;
}

.page-about .about-field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 16px;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-field {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  outline: none;
}

.page-about .about-field-ring {
  position: relative;
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border: 1px dashed var(--grid-line);
  border-radius: 50%;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-field-ring::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(0, 229, 208, 0.26);
  border-radius: 50%;
  transition: border-color 0.3s var(--ease);
}

.page-about .about-field:nth-child(3n + 1) .about-field-ring {
  transform: rotate(-7deg);
}

.page-about .about-field:nth-child(3n + 2) .about-field-ring {
  transform: rotate(4deg);
}

.page-about .about-field:nth-child(3n) .about-field-ring {
  transform: rotate(-2deg);
}

.page-about .about-field:hover .about-field-ring,
.page-about .about-field:focus .about-field-ring {
  border-color: var(--cyan);
  background: rgba(0, 229, 208, 0.07);
  transform: rotate(0deg);
}

.page-about .about-field:focus-visible .about-field-ring {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-field-num {
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-field-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .about-field-tip {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 6;
  width: max(200px, 100%);
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--cyan);
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.62;
  color: var(--paper);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0.25s;
  pointer-events: none;
}

.page-about .about-field:hover .about-field-tip,
.page-about .about-field:focus .about-field-tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 64px 0;
  background: linear-gradient(180deg, rgba(122, 0, 22, 0.22), var(--ink) 46%);
}

.page-about .about-team-grid {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.page-about .about-team-card {
  position: relative;
  padding: 22px 20px 22px 24px;
  background: var(--panel);
  border-left: 2px solid var(--red);
}

.page-about .about-team-card:nth-child(2) {
  border-left-color: var(--cyan);
}

.page-about .about-team-card:nth-child(3) {
  border-left-color: var(--lime);
}

.page-about .about-team-index {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-team-card h3 {
  margin: 8px 0 8px;
  font-size: 18px;
  font-weight: 500;
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .about-team-figure {
  margin: 30px 0 0;
}

/* ---------- 理念 ---------- */
.page-about .about-principles {
  padding: 64px 0;
}

.page-about .about-principles-grid {
  display: grid;
  gap: 32px;
}

.page-about .about-principle-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .about-principle-list li {
  padding: 18px 0 18px 18px;
  border-left: 1px solid var(--grid-line);
  transition: border-color 0.3s var(--ease);
}

.page-about .about-principle-list li:hover {
  border-left-color: var(--cyan);
}

.page-about .about-principle-list h3 {
  margin: 0 0 7px;
  font-size: 17px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .about-principle-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: 8px;
  padding: 48px 0 56px;
  background:
    linear-gradient(100deg, rgba(228, 0, 43, 0.9) 0%, rgba(122, 0, 22, 0.9) 58%, rgba(10, 10, 15, 0.95) 100%);
}

.page-about .about-cta-inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(244, 241, 234, 0.82);
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-crumb-wrap {
    padding-top: 32px;
  }

  .page-about .about-hero {
    padding: 44px 0 84px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 56px;
    align-items: end;
  }

  .page-about .about-hero-lead {
    font-size: 17px;
  }

  .page-about .about-timeline,
  .page-about .about-library,
  .page-about .about-fields,
  .page-about .about-team,
  .page-about .about-principles {
    padding: 88px 0;
  }

  .page-about .about-stage {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
    padding: 34px 0;
  }

  .page-about .about-stage-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .about-lib-grid {
    grid-template-columns: 0.88fr 1.12fr;
    gap: 52px;
    align-items: start;
  }

  .page-about .about-field-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 32px 22px;
  }

  .page-about .about-team-figure {
    margin-top: 38px;
  }

  .page-about .about-principles-grid {
    grid-template-columns: 0.92fr 1.08fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-cta-inner {
    grid-template-columns: 1.2fr auto;
    align-items: center;
    gap: 36px;
  }
}

@media (max-width: 719px) {
  .page-about .about-field-tip {
    position: static;
    width: auto;
    opacity: 1;
    visibility: visible;
    transform: none;
    padding: 5px 0 0 10px;
    background: transparent;
    border: 0;
    border-left: 2px solid rgba(0, 229, 208, 0.5);
    border-radius: 0;
    color: var(--muted);
    font-size: 13px;
    pointer-events: auto;
  }
}
<<<END>>>