.page-about {
  background: var(--bg);
  color: var(--text);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  padding: clamp(16px, 3vw, 28px) 0 clamp(24px, 5vw, 48px);
}

.page-about .about-hero__panel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: clamp(28px, 5vw, 64px) clamp(20px, 4vw, 56px);
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2.4vw, 22px);
  background:
    radial-gradient(120% 100% at 92% 0%, rgba(76, 245, 200, 0.16), transparent 58%),
    radial-gradient(90% 90% at 4% 100%, rgba(182, 106, 74, 0.16), transparent 62%),
    var(--surface);
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  inset: auto -10% -55% 40%;
  height: 60%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(94, 140, 106, 0.22), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(2.2rem, 8vw, 4.8rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--bone-100);
  position: relative;
  z-index: 1;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 60ch;
  color: var(--text-dim);
  position: relative;
  z-index: 1;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(6px, 1.6vw, 14px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 16px;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 0 10px 12px;
  border-left: 2px solid var(--slate-700);
}

.page-about .about-hero__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  line-height: 1;
  color: var(--neon-400);
}

.page-about .about-hero__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-dim);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(36px, 7vw, 84px) 0;
}

.page-about .about-chapter--pitch {
  background: var(--pitch-950);
}

.page-about .about-chapter--moss {
  background: var(--pitch-800);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(16px, 3vw, 30px);
  align-items: start;
}

.page-about .about-chapter__side {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-chapter__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--moss-500);
}

.page-about .about-chapter__body {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2.2vw, 20px);
  min-width: 0;
}

.page-about .about-chapter__body > .h2 {
  margin: 0;
  max-width: 24ch;
}

.page-about .about-chapter__text {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-chapter__text strong {
  color: var(--bone-100);
  font-weight: 600;
}

.page-about .about-chapter__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: 64ch;
}

.page-about .about-chapter__list li {
  position: relative;
  padding-left: 22px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-chapter__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-pill);
  background: var(--clay-500);
}

.page-about .about-chapter__list strong {
  color: var(--bone-100);
  font-weight: 600;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface-2);
  border: 1px solid var(--line);
}

.page-about .about-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure--band .media__img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure .media__caption {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-dim);
  background: rgba(11, 18, 16, 0.6);
}

/* ---------- 双入口 ---------- */
.page-about .duo__svg {
  display: block;
  width: 100%;
  max-width: 720px;
  height: auto;
  margin: 0 auto;
}

.page-about .duo__svg path {
  fill: none;
  stroke-width: 2.5;
  stroke-linecap: round;
}

.page-about .duo__stem {
  stroke: var(--moss-500);
}

.page-about .duo__branch--legacy {
  stroke: var(--clay-500);
}

.page-about .duo__branch--modern {
  stroke: var(--neon-400);
  stroke-dasharray: 7 7;
}

.page-about .duo__node {
  fill: var(--moss-500);
}

.page-about .duo {
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
}

.page-about .duo__path {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 3vw, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(11, 18, 16, 0.55);
  transition: border-color 180ms var(--ease), background 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .duo__path > .tag {
  align-self: flex-start;
}

.page-about .duo__path > .h3 {
  margin: 0;
}

.page-about .duo__path:hover,
.page-about .duo__path:focus-within {
  transform: translateY(-2px);
  border-color: var(--moss-500);
  background: rgba(22, 53, 42, 0.72);
}

.page-about .duo__path--legacy:hover,
.page-about .duo__path--legacy:focus-within {
  border-color: var(--clay-500);
}

.page-about .duo__path--modern:hover,
.page-about .duo__path--modern:focus-within {
  border-color: var(--neon-400);
}

.page-about .duo__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .duo__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .duo__list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--moss-500);
}

.page-about .duo__fit {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-dim);
  transition: color 180ms var(--ease);
}

.page-about .duo__path:hover .duo__fit,
.page-about .duo__path:focus-within .duo__fit {
  color: var(--bone-100);
}

.page-about .duo__fit strong {
  color: var(--bone-100);
  font-weight: 600;
}

/* ---------- 覆盖数据 ---------- */
.page-about .about-stats {
  display: grid;
  gap: clamp(12px, 2.4vw, 20px);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.6vw, 24px);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--moss-500);
  background: rgba(22, 53, 42, 0.5);
}

.page-about .about-stat--neon {
  border-left-color: var(--neon-400);
}

.page-about .about-stat--clay {
  border-left-color: var(--clay-500);
}

.page-about .about-stat--moss {
  border-left-color: var(--moss-500);
}

.page-about .about-stat__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  line-height: 1;
  color: var(--bone-100);
}

.page-about .about-stat__cap {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--moss-500);
}

.page-about .about-stat p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-stat .live-dot {
  margin-right: 6px;
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 3vw, 26px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 25px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: var(--radius-pill);
  background: linear-gradient(var(--moss-500), var(--neon-400), var(--slate-700));
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 66px;
}

.page-about .about-timeline__marker {
  position: absolute;
  left: 0;
  top: 0;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-pill);
  border: 2px solid var(--moss-500);
  background: var(--surface);
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--neon-400);
  letter-spacing: 0.02em;
}

.page-about .about-chapter--moss .about-timeline__marker {
  background: var(--pitch-950);
}

.page-about .about-timeline__content > .h3 {
  margin: 0 0 6px;
}

.page-about .about-timeline__content p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 联系方式 ---------- */
.page-about .about-contact {
  display: grid;
  gap: 14px;
  margin-top: 6px;
  padding: clamp(18px, 3vw, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(22, 53, 42, 0.45);
}

.page-about .about-contact__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-start;
}

.page-about .about-contact__link {
  font-size: clamp(15px, 1.7vw, 18px);
  font-weight: 600;
  color: var(--bone-100);
  overflow-wrap: anywhere;
}

.page-about .about-contact__note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 收束 ---------- */
.page-about .about-next-wrap {
  padding: clamp(28px, 5vw, 64px) 0 clamp(40px, 7vw, 80px);
}

.page-about .about-next {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: clamp(24px, 4.5vw, 48px);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(110% 130% at 100% 0%, rgba(76, 245, 200, 0.14), transparent 60%),
    var(--pitch-950);
  border: 1px solid var(--line);
}

.page-about .about-next > .h2 {
  margin: 0;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-hero__fact + .about-hero__fact {
    padding-left: clamp(12px, 2vw, 24px);
  }

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

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

  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 36px);
  }

  .page-about .about-contact__item--wide {
    grid-column: 1 / -1;
  }
}

/* ---------- 桌面端纵向卷轴骨架 ---------- */
@media (min-width: 960px) {
  .page-about .about-chapter__grid {
    grid-template-columns: 92px minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-chapter__grid--media {
    grid-template-columns: 92px minmax(0, 1.12fr) minmax(0, 0.88fr);
    column-gap: clamp(24px, 3.6vw, 48px);
  }

  .page-about .about-chapter__side {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-about .about-chapter__body > .h2 {
    max-width: 22ch;
  }

  .page-about .duo {
    margin-top: 4px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__panel {
    padding-left: clamp(40px, 5vw, 72px);
    padding-right: clamp(40px, 5vw, 72px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .duo__path {
    transition: none;
  }

  .page-about .duo__path:hover,
  .page-about .duo__path:focus-within {
    transform: none;
  }
}
<<<END>>>