.page-about {
  --about-aside: 8.5rem;
  --about-gap: clamp(1.5rem, 3.5vw, 3.5rem);
  padding-bottom: clamp(3rem, 8vw, 7rem);
}

/* ---------- 开篇 ---------- */
.page-about .about-intro {
  padding-block: clamp(1.75rem, 5vw, 4rem) clamp(1.5rem, 4vw, 3rem);
}

.page-about .about-intro__title {
  margin: 0.7rem 0 0;
  font-size: clamp(2.05rem, 6.6vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 900;
  color: var(--c-cold);
  border-bottom: 1px solid var(--c-charcoal);
  padding-bottom: clamp(1rem, 3vw, 2rem);
}

.page-about .about-intro__cols {
  display: grid;
  gap: 1.5rem;
  margin-top: clamp(1.25rem, 3.5vw, 2.25rem);
}

@media (min-width: 880px) {
  .page-about .about-intro__cols {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }
}

.page-about .about-intro__lede {
  margin: 0;
  max-width: 58ch;
}

.page-about .about-intro__key {
  list-style: none;
  margin: 0;
  padding: 1rem 0 0;
  border-top: 2px solid var(--c-lime);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.6rem;
}

.page-about .about-intro__key-item {
  min-width: 0;
}

.page-about .about-intro__key-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-lime);
}

.page-about .about-intro__key-label {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.76rem;
  line-height: 1.5;
  color: var(--c-mist);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(1.25rem, 3vw, 2.25rem) 0 0;
}

.page-about .about-figure__media,
.page-about .lj-figure__media {
  overflow: hidden;
}

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

.page-about .about-figure--lead {
  margin-top: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .about-figure--lead .lj-figure__media {
  clip-path: polygon(0 0, 100% 3%, 100% 100%, 0 97%);
}

.page-about .about-figure--side .lj-figure__media,
.page-about .about-figure--square .lj-figure__media {
  border-left: 2px solid var(--c-lime);
}

@media (min-width: 900px) {
  .page-about .about-figure--side {
    max-width: 520px;
    margin-left: auto;
  }
  .page-about .about-figure--square {
    max-width: 560px;
  }
}

.page-about .lj-figure__caption {
  margin-top: 0.65rem;
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--c-mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
  padding-block: clamp(2rem, 5vw, 3.25rem);
  border-top: 1px solid var(--c-charcoal);
}

.page-about .about-chapter:first-of-type {
  border-top: 0;
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-aside) minmax(0, 1fr);
    column-gap: var(--about-gap);
    padding-block: clamp(2.5rem, 5vw, 4.25rem);
  }
}

.page-about .about-chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding-left: 0.85rem;
  border-left: 1px solid var(--c-charcoal);
}

@media (min-width: 900px) {
  .page-about .about-chapter__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.55rem;
    padding-left: 1rem;
  }
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 5.5vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-charcoal);
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-chapter:hover .about-chapter__num,
.page-about .about-chapter__num:focus-visible {
  color: var(--c-lime);
  transform: translateY(-1px);
}

.page-about .about-chapter__kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-mist);
  white-space: nowrap;
}

.page-about .about-chapter__title {
  margin: 0 0 1.1rem;
  font-size: clamp(1.45rem, 3.4vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--c-cold);
}

.page-about .about-chapter__text {
  margin: 0 0 0.95rem;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-cold);
}

.page-about .about-chapter__text:last-of-type {
  margin-bottom: 0;
}

.page-about .about-chapter__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.4rem 0 0;
}

.page-about .about-chapter--shift .about-chapter__body {
  background: var(--c-graphite);
  border-left: 3px solid var(--c-orange);
  padding: clamp(1.15rem, 3vw, 2rem);
}

.page-about .about-chapter--shift .about-chapter__title::before {
  content: "";
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  margin-right: 0.6rem;
  background: var(--c-orange);
  transform: rotate(45deg) translateY(-0.1rem);
}

/* ---------- 四条内容线 ---------- */
.page-about .about-lanes {
  list-style: none;
  margin: 1.5rem 0 1.5rem;
  padding: 0;
  border-top: 1px solid var(--c-charcoal);
}

.page-about .about-lanes__item {
  display: grid;
  gap: 0.35rem;
  padding: 1.05rem 0.5rem 1.05rem 0;
  border-bottom: 1px solid var(--c-charcoal);
  transition: background var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .about-lanes__item:hover {
  background: var(--c-graphite);
  padding-left: 0.75rem;
}

@media (min-width: 760px) {
  .page-about .about-lanes__item {
    grid-template-columns: 7rem minmax(0, 1fr);
    column-gap: 1.25rem;
    align-items: baseline;
  }
}

.page-about .about-lanes__name {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--c-lime);
}

.page-about .about-lanes__desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--c-cold);
}

/* ---------- 规模数字 ---------- */
.page-about .about-metrics {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-about .about-metrics__item {
  border-top: 2px solid var(--c-lime);
  padding-top: 0.85rem;
  min-width: 0;
}

.page-about .about-metrics__item--orange {
  border-top-color: var(--c-orange);
}

.page-about .about-metrics__item--blue {
  border-top-color: var(--c-blue);
}

.page-about .about-metrics__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.65rem, 4.2vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-cold);
}

.page-about .about-metrics__item--orange .about-metrics__value {
  color: var(--c-orange);
}

.page-about .about-metrics__item--blue .about-metrics__value {
  color: var(--c-blue);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--c-mist);
}

/* ---------- 赛季脉络 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 1.5rem 0 1.4rem;
  padding: 0;
}

.page-about .about-track__item {
  position: relative;
  margin-left: 0.35rem;
  padding: 0.9rem 0 0.9rem 1.6rem;
  border-left: 1px solid var(--c-charcoal);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 1.42rem;
  width: 7px;
  height: 7px;
  background: var(--c-lime);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease);
}

.page-about .about-track__item:hover::before {
  background: var(--c-blue);
}

.page-about .about-track__phase {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--c-lime);
}

.page-about .about-track__text {
  margin: 0;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--c-cold);
}

/* ---------- 行内链接 ---------- */
.page-about .about-inline {
  color: var(--c-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 212, 255, 0.35);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

/* ---------- 结尾信息条 ---------- */
.page-about .about-endnote {
  position: relative;
  margin-top: clamp(2.25rem, 6vw, 4rem);
  padding-top: 1.4rem;
  border-top: 1px solid var(--c-charcoal);
}

.page-about .about-endnote::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 78px;
  height: 2px;
  background: var(--c-lime);
}

.page-about .about-endnote__text {
  margin: 0;
  max-width: 72ch;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--c-cold);
}

/* ---------- 紧凑屏 ---------- */
@media (max-width: 640px) {
  .page-about .about-intro__key {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.4rem;
  }

  .page-about .about-intro__key-label {
    font-size: 0.7rem;
  }

  .page-about .about-lanes__item:hover {
    padding-left: 0;
  }

  .page-about .about-figure--lead .lj-figure__media {
    clip-path: none;
  }

  .page-about .about-chapter--shift .about-chapter__body {
    border-left-width: 2px;
  }
}