.page-about {
  --about-pad: clamp(2.5rem, 7vw, 5rem);
  --about-card-pad: clamp(1rem, 2.6vw, 1.5rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.25rem, 4vw, 2.5rem) clamp(2.5rem, 6vw, 4.5rem);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(41, 242, 210, 0.55), transparent);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-hero h1 {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.05rem, 7vw, 4.5rem);
  line-height: 1.07;
  letter-spacing: -0.02em;
  color: var(--glass-white);
}

.page-about .about-hero__accent {
  color: var(--cyan);
  font-style: normal;
}

.page-about .about-hero .lede {
  max-width: 48ch;
  margin-top: 1rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.page-about .about-hero__aside {
  display: grid;
  gap: 1.1rem;
  align-content: end;
}

.page-about .about-hero__note {
  margin: 0;
  padding-left: 1rem;
  border-left: 2px solid var(--line);
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--cool-grey);
}

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

.page-about .about-index a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.2rem;
  border-bottom: 1px solid var(--line-soft);
  color: var(--glass-white);
  text-decoration: none;
  font-size: 0.94rem;
  transition: color 0.25s ease, padding-left 0.25s ease;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan);
  padding-left: 0.45rem;
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figure {
  padding: clamp(0.9rem, 2.4vw, 1.4rem);
  background: rgba(3, 11, 22, 0.55);
}

.page-about .about-figure dt {
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--cool-grey);
}

.page-about .about-figure dd {
  margin: 0.45rem 0 0;
}

.page-about .about-figure__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.45rem, 4vw, 2.05rem);
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-figure__value small {
  margin-left: 0.1em;
  font-size: 0.6em;
  color: var(--amber);
}

/* ---------- 通用视觉层 ---------- */
.page-about .about-visual {
  position: relative;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(140deg, rgba(41, 242, 210, 0.08), rgba(123, 97, 255, 0.1) 55%, rgba(3, 11, 22, 0.6));
}

.page-about .about-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.92;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline-section {
  padding-block: var(--about-pad);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(1rem, 3vw, 1.6rem);
}

.page-about .about-node {
  position: relative;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: 1.6rem;
  display: none;
  width: 9px;
  height: 9px;
  margin-left: -4.5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(41, 242, 210, 0.12);
}

.page-about .about-node__year {
  margin: 0;
  padding-top: 0.3rem;
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-node__card {
  padding: var(--about-card-pad);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-node__card:hover {
  border-color: rgba(41, 242, 210, 0.42);
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px rgba(41, 242, 210, 0.1), 0 22px 44px rgba(3, 11, 22, 0.5);
}

.page-about .about-node__tag {
  margin: 0 0 0.55rem;
}

.page-about .about-node__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  color: var(--glass-white);
}

.page-about .about-node__card > p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--cool-grey);
}

.page-about .about-node__more {
  margin-top: 0.95rem;
  padding-top: 0.8rem;
  border-top: 1px dashed var(--line);
}

.page-about .about-node__more summary {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-node__more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node__more summary::after {
  content: "+";
  font-size: 0.95rem;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-node__more[open] summary::after {
  content: "–";
}

.page-about .about-node__more ul {
  margin: 0.8rem 0 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.45rem;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--cool-grey);
}

.page-about .about-node__more li::marker {
  color: var(--cyan);
}

/* ---------- 档案库 ---------- */
.page-about .about-archive {
  padding-block: var(--about-pad);
}

.page-about .about-archive__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .about-archive__sources {
  margin: 1.1rem 0 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--cool-grey);
}

.page-about .about-archive__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.1rem 0 0;
}

.page-about .about-fields {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-field {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  padding: clamp(1rem, 2.4vw, 1.35rem);
  background: rgba(3, 11, 22, 0.5);
  transition: background 0.3s ease;
}

.page-about .about-field:hover {
  background: rgba(41, 242, 210, 0.055);
}

.page-about .about-field__num {
  padding-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--purple);
}

.page-about .about-field h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--glass-white);
}

.page-about .about-field p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--cool-grey);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: var(--about-pad);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .about-roles {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .about-role {
  padding: clamp(1rem, 2.4vw, 1.35rem);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
}

.page-about .about-role__value {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.8rem, 4.5vw, 2.4rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-role__unit {
  margin-left: 0.15em;
  font-size: 0.5em;
  color: var(--amber);
}

.page-about .about-role h3 {
  margin: 0.6rem 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--glass-white);
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--cool-grey);
}

.page-about .about-team__cadence {
  margin: 1.35rem 0 0;
  padding-left: 1rem;
  border-left: 2px solid var(--amber);
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--cool-grey);
}

.page-about .about-visual--team {
  margin-top: 0;
}

/* ---------- 版本里程碑 ---------- */
.page-about .about-versions {
  padding-block: var(--about-pad);
}

.page-about .about-versions__tabs {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .about-version-tab {
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass);
  color: var(--cool-grey);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-version-tab:hover {
  color: var(--glass-white);
  border-color: rgba(41, 242, 210, 0.5);
}

.page-about .about-version-tab[aria-selected="true"] {
  color: var(--night);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .tab-panel {
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-version-panel {
  display: grid;
  gap: 1rem;
  padding: clamp(1.15rem, 3vw, 1.75rem);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(123, 97, 255, 0.1), rgba(41, 242, 210, 0.06) 60%, rgba(3, 11, 22, 0.55));
}

.page-about .about-version__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-version-panel h3 {
  margin: 0.5rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  color: var(--glass-white);
}

.page-about .about-version-panel p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--cool-grey);
}

.page-about .about-version__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
  align-content: start;
}

.page-about .about-version__list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--glass-white);
}

.page-about .about-version__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(41, 242, 210, 0.14);
}

/* ---------- 合作生态 ---------- */
.page-about .about-ecosystem {
  padding-block: var(--about-pad);
}

.page-about .about-eco-grid {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-eco {
  padding: clamp(1.1rem, 2.6vw, 1.5rem);
  background: rgba(3, 11, 22, 0.5);
}

.page-about .about-eco__idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--purple);
}

.page-about .about-eco h3 {
  margin: 0.7rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--glass-white);
}

.page-about .about-eco p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--cool-grey);
}

.page-about .about-eco__strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--cool-grey);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(2.25rem, 6vw, 4rem);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-cta h2 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.4vw, 2.15rem);
  line-height: 1.2;
  color: var(--glass-white);
}

.page-about .about-cta p {
  max-width: 54ch;
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--cool-grey);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-timeline {
    padding-left: 1.6rem;
    border-left: 1px solid var(--line);
  }

  .page-about .about-node {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: clamp(1rem, 2.5vw, 2rem);
    align-items: start;
  }

  .page-about .about-node::before {
    display: block;
  }

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

@media (min-width: 820px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-version-panel {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: clamp(1.25rem, 3vw, 2rem);
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: end;
  }

  .page-about .about-archive__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about .about-eco-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__card,
  .page-about .about-field,
  .page-about .about-index a,
  .page-about .about-version-tab {
    transition: none;
  }

  .page-about .about-node__card:hover {
    transform: none;
  }
}