.page-about {
  --about-ink-line: rgba(11, 23, 38, .14);
  --about-ink-line-strong: rgba(11, 23, 38, .3);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.1rem, 4vw, 2.2rem) var(--pad) clamp(2.4rem, 6vw, 4.6rem);
}

.page-about .about-contour {
  position: absolute;
  inset: auto 0 0 0;
  width: 100%;
  height: 78%;
  color: rgba(246, 243, 236, .09);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  max-width: 1240px;
  margin: 0 auto;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  margin-top: clamp(1.6rem, 4vw, 2.8rem);
}

.page-about .about-hero__title {
  font-size: clamp(2.2rem, 7.4vw, 4.6rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  margin: .8rem 0 0;
  font-weight: 800;
}

.page-about .about-hero__lede {
  margin-top: 1.2rem;
  max-width: 46ch;
  color: var(--mist);
}

.page-about .about-frame {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-soft);
}

.page-about .about-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .about-frame__cap {
  display: block;
  padding: .6rem .8rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(1.6rem, 3.4vw, 2.6rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats .stat {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: 1rem 1rem 1.15rem;
  background: var(--ink-soft);
  margin: 0;
}

.page-about .about-stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  line-height: 1.1;
  color: var(--mint);
  letter-spacing: .02em;
}

.page-about .about-stats .stat__unit {
  font-size: .62em;
  margin-left: .12em;
  color: var(--mint);
}

.page-about .about-stats .stat__label {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 跨页叙事 ---------- */
.page-about .about-spread {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(2.2rem, 6vw, 5rem) var(--pad) clamp(2.8rem, 7vw, 6rem);
}

.page-about .about-spread__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  max-width: 1180px;
  margin: 0 auto;
}

.page-about .about-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem 1.1rem;
  border-bottom: 1px solid var(--about-ink-line);
  padding-bottom: 1rem;
}

.page-about .about-rail__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  color: var(--rust);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .3rem .9rem;
}

.page-about .about-rail__link {
  display: block;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--stone);
  text-decoration: none;
  padding: .18rem 0 .18rem .55rem;
  border-left: 2px solid var(--about-ink-line);
  transition: color .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--rust);
  border-left-color: var(--rust);
}

.page-about .about-rail__spine {
  display: none;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(1.6rem, 3.4vw, 2.6rem);
}

.page-about .about-chapter:first-child {
  padding-top: 0;
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--about-ink-line);
}

.page-about .about-chapter__num {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .18em;
  color: var(--rust);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.24;
  letter-spacing: -.015em;
  font-weight: 800;
  color: var(--ink);
  max-width: 22ch;
}

.page-about .about-chapter__title::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: .9rem;
  background: var(--rust);
}

.page-about .about-prose {
  max-width: 64ch;
}

.page-about .about-prose p {
  margin: 1.05rem 0 0;
  font-size: clamp(1rem, 1.4vw, 1.0625rem);
  line-height: 1.88;
  color: #24313d;
}

.page-about .about-note {
  margin: 1.4rem 0 0;
  padding-left: .9rem;
  border-left: 2px solid var(--rust);
  font-family: var(--font-mono);
  font-size: .76rem;
  line-height: 1.8;
  letter-spacing: .03em;
  color: var(--stone);
  max-width: 54ch;
}

.page-about .about-inline-link {
  color: var(--rust);
  text-underline-offset: 3px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--ink);
}

/* ---------- 赛前 / 临场 / 赛后 ---------- */
.page-about .about-phases {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-ink-line);
  border-top: 1px solid var(--about-ink-line);
  border-bottom: 1px solid var(--about-ink-line);
}

.page-about .about-phase {
  background: var(--paper);
  padding: 1.2rem .2rem 1.4rem;
}

.page-about .about-phase__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--rust);
  padding-left: .2rem;
}

.page-about .about-phase__title {
  margin: .5rem 0 0;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  padding-left: .2rem;
}

.page-about .about-phase__text {
  margin: .55rem 0 0;
  font-size: .95rem;
  line-height: 1.8;
  color: #3a4652;
  padding-left: .2rem;
}

/* ---------- 三条内容线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.2rem) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(1.2rem, 3vw, 2rem);
}

.page-about .about-line {
  border-top: 3px solid var(--rust);
  padding-top: 1rem;
}

.page-about .about-line--ink {
  border-top-color: var(--ink);
}

.page-about .about-line--gold {
  border-top-color: var(--gold);
}

.page-about .about-line__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .18em;
  color: var(--stone);
}

.page-about .about-line__title {
  margin: .45rem 0 0;
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-line__q {
  margin: .4rem 0 0;
  font-size: .95rem;
  color: var(--rust);
}

.page-about .about-line--ink .about-line__q {
  color: var(--ink);
}

.page-about .about-line--gold .about-line__q {
  color: #8a6111;
}

.page-about .about-line__text {
  margin: .6rem 0 0;
  font-size: .95rem;
  line-height: 1.82;
  color: #3a4652;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: clamp(1.6rem, 3.4vw, 2.4rem) 0 0;
}

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

.page-about .about-figure figcaption {
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--stone);
}

/* ---------- 结尾 ---------- */
.page-about .about-close {
  position: relative;
  overflow: hidden;
  padding: clamp(2.4rem, 6vw, 4.6rem) var(--pad) clamp(2.6rem, 6vw, 4.8rem);
}

.page-about .about-close__contour {
  position: absolute;
  inset: auto 0 0 0;
  width: 100%;
  height: 100%;
  color: rgba(95, 242, 194, .1);
  pointer-events: none;
}

.page-about .about-close__inner {
  position: relative;
  max-width: 1180px;
  margin: 0 auto;
}

.page-about .about-close__title {
  margin: .9rem 0 0;
  font-size: clamp(1.7rem, 4.6vw, 3rem);
  line-height: 1.18;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-close__text {
  margin: 1.1rem 0 0;
  max-width: 52ch;
  font-size: clamp(1rem, 1.4vw, 1.0625rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-close__actions {
  margin-top: clamp(1.4rem, 3vw, 2rem);
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: end;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-phase {
    padding: 1.3rem 1.1rem 1.5rem;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-spread__grid {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(2.4rem, 5vw, 4.8rem);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--bar-h) + 1.8rem);
    align-self: start;
    border-bottom: 0;
    padding-bottom: 0;
    border-left: 1px solid var(--about-ink-line);
    padding-left: 1.1rem;
  }

  .page-about .about-rail__kicker {
    margin-bottom: 1rem;
  }

  .page-about .about-rail__list {
    display: grid;
    gap: .9rem;
  }

  .page-about .about-rail__spine {
    display: block;
    writing-mode: vertical-rl;
    margin: 2.6rem 0 0;
    padding-left: .55rem;
    border-left: 2px solid var(--rust);
    font-family: var(--font-mono);
    font-size: .82rem;
    letter-spacing: .38em;
    color: var(--stone);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    gap: clamp(2rem, 4vw, 3.6rem);
  }

  .page-about .about-stats li:nth-child(2) {
    transform: translateY(14px);
  }

  .page-about .about-stats li:nth-child(4) {
    transform: translateY(-10px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stats li:nth-child(2),
  .page-about .about-stats li:nth-child(4) {
    transform: none;
  }
}