.page-about {
  position: relative;
  overflow-x: clip;
  background: var(--pitch-950);
  color: var(--ink-50);
}

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

/* ---------- 框景首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 40px) 0 clamp(8px, 2vw, 16px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 2px solid var(--line-600);
  padding: clamp(24px, 5vw, 64px);
  background:
    radial-gradient(120% 120% at 0% 0%, rgba(200, 255, 61, 0.09), transparent 55%),
    radial-gradient(90% 90% at 100% 100%, rgba(139, 92, 246, 0.14), transparent 60%),
    linear-gradient(180deg, var(--pitch-900), var(--pitch-950));
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px dashed rgba(200, 255, 61, 0.3);
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: clamp(80px, 16vw, 160px);
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--lime-400) 0 6px, transparent 6px 14px);
}

.page-about .about-hero__title {
  position: relative;
  margin: 16px 0 0;
  max-width: 22ch;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.4vw, 3.6rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  position: relative;
  margin: 20px 0 0;
  max-width: 66ch;
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  line-height: 1.8;
  color: var(--ink-50);
  opacity: 0.88;
}

.page-about .about-hero__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__stats {
  position: relative;
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-stat {
  border: 2px solid var(--line-600);
  background: rgba(16, 51, 31, 0.6);
  padding: 14px 16px;
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-stat:hover {
  border-color: var(--lime-400);
  transform: translateY(-4px);
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  letter-spacing: -0.02em;
  color: var(--lime-400);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 0.84rem;
  color: var(--ink-400);
}

/* ---------- 斜切色带 ---------- */
.page-about .about-band {
  height: 10px;
  margin: clamp(24px, 5vw, 48px) 0 0;
  background: linear-gradient(
    90deg,
    var(--orange-500) 0 34%,
    var(--violet-500) 34% 66%,
    var(--lime-400) 66% 100%
  );
  transform: skewY(-0.6deg);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-chapter__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1;
  color: var(--lime-400);
}

.page-about .about-chapter__rule {
  display: block;
  width: 52px;
  height: 3px;
  margin: 12px 0 16px;
  background: var(--orange-500);
}

.page-about .about-chapter__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-chapter__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--ink-400);
}

.page-about .about-chapter__body p {
  color: var(--ink-400);
  line-height: 1.78;
}

.page-about .about-chapter__foot {
  margin: 22px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--violet-500);
  background: rgba(139, 92, 246, 0.1);
  font-size: 0.94rem;
}

/* ---------- 要点列表 ---------- */
.page-about .about-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 22px;
  color: var(--ink-400);
  line-height: 1.75;
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 10px;
  height: 10px;
  background: var(--lime-400);
}

.page-about .about-list strong {
  color: var(--ink-50);
  font-weight: 700;
}

/* ---------- 方法四步 ---------- */
.page-about .method-layout {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .method-flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .method-step {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 4px 20px 0;
  border-bottom: 2px solid var(--line-600);
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .method-step:first-child {
  border-top: 2px solid var(--line-600);
}

.page-about .method-step:hover,
.page-about .method-step:focus-within {
  border-bottom-color: var(--lime-400);
  transform: translateX(4px);
}

.page-about .method-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--violet-500);
  background: rgba(139, 92, 246, 0.14);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--violet-tint);
}

.page-about .method-step__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
}

.page-about .method-step p {
  margin: 0;
  color: var(--ink-400);
  font-size: 0.94rem;
  line-height: 1.72;
}

.page-about .about-method__shot {
  margin: 0;
  border: 2px solid var(--line-600);
  background: var(--pitch-900);
  padding: 10px;
}

.page-about .about-method__chart {
  margin: clamp(26px, 4vw, 40px) 0 0;
  border: 2px solid var(--line-600);
  background: var(--pitch-900);
  padding: 10px;
}

.page-about .about-method__shot .media-frame__caption,
.page-about .about-method__chart .media-frame__caption {
  margin-top: 10px;
  font-size: 0.84rem;
  color: var(--ink-400);
  line-height: 1.6;
}

/* ---------- 团队横条 ---------- */
.page-about .team-bars {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.page-about .team-bar {
  border: 2px solid var(--line-600);
  background: rgba(16, 51, 31, 0.55);
  padding: 16px 18px;
  transition: transform 160ms var(--ease), border-color 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-about .team-bar:hover {
  transform: translateY(-4px);
  border-color: var(--lime-400);
  box-shadow: var(--shadow-hard);
}

.page-about .team-bar:focus-visible {
  outline: 2px solid var(--lime-400);
  outline-offset: 3px;
  transform: translateY(-4px);
  border-color: var(--lime-400);
}

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .team-bar__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.06rem;
  letter-spacing: -0.01em;
}

.page-about .team-bar__value {
  font-family: var(--font-mono);
  font-size: 0.94rem;
  color: var(--lime-200);
}

.page-about .team-bar__track {
  margin-top: 12px;
  height: 12px;
  background: var(--pitch-800);
  border: 2px solid var(--line-600);
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
}

.page-about .team-bar__fill--lime {
  width: 39%;
  background: var(--lime-400);
}

.page-about .team-bar__fill--orange {
  width: 33%;
  background: var(--orange-500);
}

.page-about .team-bar__fill--violet {
  width: 28%;
  background: var(--violet-500);
}

.page-about .team-bar__duty {
  margin: 12px 0 0;
  color: var(--ink-400);
  font-size: 0.92rem;
  line-height: 1.72;
}

/* ---------- 四条主线 ---------- */
.page-about .pillar-list {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .pillar {
  border: 2px solid var(--line-600);
  background: rgba(4, 21, 14, 0.55);
  padding: 18px;
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .pillar:hover {
  border-color: var(--lime-400);
  transform: translateY(-4px);
}

.page-about .pillar__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--orange-500);
}

.page-about .pillar h3 {
  margin: 8px 0 6px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
}

.page-about .pillar p {
  margin: 0;
  color: var(--ink-400);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .about-rec__intro {
  margin-top: 26px;
}

.page-about .rec-dims {
  display: grid;
  gap: 16px;
  margin-top: 20px;
}

.page-about .rec-dim {
  border-top: 3px solid var(--lime-400);
  padding-top: 12px;
}

.page-about .rec-dim__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--lime-200);
}

.page-about .rec-dim p {
  margin: 8px 0 0;
  color: var(--ink-400);
  font-size: 0.9rem;
  line-height: 1.68;
}

/* ---------- 数据来源 ---------- */
.page-about .source-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .source-item {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 2px solid var(--line-600);
  background: rgba(16, 51, 31, 0.5);
  padding: 14px 16px;
  font-size: 0.9rem;
  color: var(--ink-50);
  transition: border-color 160ms var(--ease);
}

.page-about .source-item:hover {
  border-color: var(--cyan-400);
}

.page-about .source-item__dot {
  flex: none;
  width: 10px;
  height: 10px;
}

.page-about .source-item__dot--lime {
  background: var(--lime-400);
}

.page-about .source-item__dot--orange {
  background: var(--orange-500);
}

.page-about .source-item__dot--cyan {
  background: var(--cyan-400);
}

.page-about .source-item__dot--violet {
  background: var(--violet-500);
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestone__img {
  margin: 0 0 clamp(28px, 4vw, 48px);
  border: 2px solid var(--line-600);
  background: var(--pitch-900);
  padding: 10px;
}

.page-about .about-milestone__img .media-frame__caption {
  margin-top: 10px;
  font-size: 0.84rem;
  color: var(--ink-400);
  line-height: 1.6;
}

.page-about .timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .timeline__item {
  position: relative;
  padding-top: 22px;
  border-top: 2px solid var(--line-600);
  transition: transform 160ms var(--ease);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: -9px;
  left: 0;
  width: 14px;
  height: 14px;
  background: var(--pitch-950);
  border: 3px solid var(--violet-500);
}

.page-about .timeline__item--now::before {
  background: var(--lime-400);
  border-color: var(--lime-400);
}

.page-about .timeline__item:hover {
  transform: translateY(-4px);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  color: var(--lime-400);
}

.page-about .timeline__title {
  margin: 8px 0 6px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.04rem;
  letter-spacing: -0.01em;
}

.page-about .timeline__text {
  margin: 0;
  color: var(--ink-400);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- 收束入口 ---------- */
.page-about .about-next {
  padding: clamp(40px, 6vw, 72px) 0 clamp(56px, 9vw, 104px);
}

.page-about .about-next__inner {
  border-top: 2px solid var(--line-600);
  padding-top: clamp(24px, 4vw, 40px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.page-about .about-next__lead {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.25rem, 2.6vw, 1.8rem);
  letter-spacing: -0.02em;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: 104px;
    align-self: start;
  }
}

@media (min-width: 1100px) {
  .page-about .method-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}
<<<END>>>