.page-about {
  --about-axis: 56px;
  --about-arc: rgba(124, 255, 61, 0.14);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(2rem, 5vw, 3.5rem) clamp(2.5rem, 6vw, 5rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 85% at 86% 6%, rgba(61, 214, 255, 0.16), transparent 58%),
    linear-gradient(112deg, transparent 52%, rgba(124, 255, 61, 0.05) 52% 59%, transparent 59%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__text > * + * {
  margin-top: 1rem;
}

.page-about .about-hero h1 {
  margin: 0.75rem 0 0;
  font-size: clamp(2.1rem, 6vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-hero__lede {
  max-width: 44ch;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-top: 0.5rem;
}

.page-about .about-hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about .about-orbit {
  width: min(100%, 420px);
  height: auto;
  display: block;
}

.page-about .orbit-ring {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .orbit-arc {
  fill: none;
  stroke: var(--lime);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 320 900;
}

.page-about .orbit-ticks {
  fill: none;
  stroke: var(--line);
  stroke-width: 2;
  stroke-dasharray: 2 14;
}

.page-about .orbit-inner {
  fill: none;
  stroke: rgba(30, 58, 110, 0.7);
  stroke-width: 1;
  stroke-dasharray: 3 9;
}

.page-about .orbit-bars rect {
  fill: var(--ink-700);
}

.page-about .orbit-bars rect:first-child {
  fill: var(--lime);
  opacity: 0.9;
}

.page-about .orbit-bars rect:nth-child(2) {
  fill: var(--cyan);
  opacity: 0.35;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .orbit-arc {
    animation: about-orbit-breathe 7s ease-in-out infinite;
  }
}

@keyframes about-orbit-breathe {
  0%,
  100% {
    opacity: 0.5;
  }
  50% {
    opacity: 1;
  }
}

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

/* ---------- 章节总览 ---------- */
.page-about .about-stages {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-stages__head {
  padding-bottom: clamp(1.5rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-stages__title {
  margin: 0.75rem 0 0;
  max-width: 24ch;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--white);
}

/* ---------- 时间线阶段 ---------- */
.page-about .stage {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 0.9rem;
  padding-block: clamp(1.75rem, 4.5vw, 3.5rem);
}

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

.page-about .stage__rail::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 2rem;
  bottom: -1.75rem;
  width: 1px;
  background: linear-gradient(180deg, var(--line), rgba(30, 58, 110, 0.18));
}

.page-about .stage:last-child .stage__rail::before {
  bottom: auto;
  height: 2.5rem;
}

.page-about .stage__dot {
  position: relative;
  display: block;
  width: 13px;
  height: 13px;
  margin-top: 0.4rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink-800);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .stage__dot:hover,
.page-about .stage__dot:focus-visible {
  border-color: var(--lime);
}

.page-about .stage.is-in .stage__dot {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 4px var(--about-arc);
}

.page-about .stage.is-in .stage__rail::before {
  background: linear-gradient(180deg, var(--lime), rgba(30, 58, 110, 0.2));
  opacity: 0.55;
}

.page-about .stage__label {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .stage h2 {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin: 0.5rem 0 1.1rem;
  font-size: clamp(1.35rem, 3.2vw, 2.1rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--white);
}

.page-about .stage h2::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  min-width: 1rem;
  background: linear-gradient(90deg, var(--line), transparent);
}

.page-about .stage__content {
  max-width: 62ch;
}

.page-about .stage__content p {
  margin: 0;
  color: var(--muted);
  font-size: 0.975rem;
  line-height: 1.8;
}

.page-about .stage__content p + p {
  margin-top: 0.95rem;
}

.page-about .stage__content a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 214, 255, 0.4);
}

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

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

/* ---------- 表格 ---------- */
.page-about .team-table {
  width: 100%;
  border-collapse: collapse;
  margin-block: 1.25rem;
  font-size: 0.8125rem;
  table-layout: fixed;
}

.page-about .team-table th {
  padding: 0.55rem 0.5rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--muted);
  text-align: left;
}

.page-about .team-table td {
  padding: 0.7rem 0.5rem;
  border-bottom: 1px dashed rgba(30, 58, 110, 0.6);
  color: var(--white);
  line-height: 1.5;
  vertical-align: top;
  word-break: break-word;
}

.page-about .team-table tbody tr:last-child td {
  border-bottom-color: var(--line);
}

.page-about .team-table td.mono {
  color: var(--lime);
  font-size: 0.95rem;
}

/* ---------- 图片 ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .figure__cap {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-break {
  margin-block: clamp(1.5rem, 4vw, 3rem);
}

.page-about .about-break img {
  max-height: 420px;
}

/* ---------- 归档结构图 ---------- */
.page-about .arch {
  display: grid;
  gap: 1.5rem;
  margin-block: 1.5rem;
}

.page-about .arch__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .arch-link {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .arch-node {
  cursor: default;
  outline: none;
}

.page-about .arch-node rect {
  fill: var(--ink-800);
  stroke: var(--line);
  stroke-width: 1;
  transition: stroke 0.25s ease, fill 0.25s ease;
}

.page-about .arch-node:hover rect,
.page-about .arch-node:focus-visible rect {
  stroke: var(--lime);
  fill: var(--ink-700);
}

.page-about .arch-label {
  fill: var(--white);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-about .arch-hint {
  fill: var(--lime);
  font-family: var(--font-body);
  font-size: 10px;
  letter-spacing: 0.04em;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.page-about .arch-node:hover .arch-hint,
.page-about .arch-node:focus-visible .arch-hint {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .arch-hint,
  .page-about .arch-node rect {
    transition: none;
  }
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(90% 120% at 12% 100%, rgba(124, 255, 61, 0.1), transparent 60%),
    var(--ink-850);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-cta h2 {
  margin: 0.5rem 0 0.9rem;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-content: start;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .stage {
    grid-template-columns: var(--about-axis) minmax(0, 1fr);
    gap: clamp(1rem, 3vw, 2.25rem);
  }

  .page-about .stage__rail::before {
    left: 6px;
  }
}

@media (min-width: 900px) {
  .page-about .stage__split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .arch {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: center;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__lede {
    font-size: 1.05rem;
  }

  .page-about .stage__content p {
    font-size: 1rem;
  }
}
<<<END>>>