.page-about {
  --measure: 42em;
  --num-col: 112px;
  --num-gap: 40px;
  --note-w: 232px;
}

/* ---------- 页头 ---------- */
.page-about .about-head {
  max-width: var(--measure);
  padding-top: 34px;
  padding-bottom: 52px;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

.page-about .about-crumb span[aria-current] {
  color: var(--paper);
}

.page-about .about-head h1 {
  margin: 0 0 22px;
  font-size: clamp(27px, 6.2vw, 44px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-lede {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-flow {
  padding-top: 6px;
}

.page-about .chapter {
  position: relative;
  padding-top: 38px;
}

.page-about .chapter + .chapter {
  margin-top: 66px;
}

.page-about .chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: clamp(72px, 22vw, 182px);
  height: 12px;
  background: linear-gradient(90deg, var(--fox), var(--ember));
  clip-path: polygon(0 0, 100% 0, 100% 2px, 0 10px);
  opacity: 0.9;
}

.page-about .chapter__num {
  display: block;
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--fox);
}

.page-about .chapter__body {
  max-width: 880px;
}

.page-about .chapter__body::after {
  content: "";
  display: table;
  clear: both;
}

.page-about .chapter__body .eyebrow {
  display: block;
  margin: 0 0 10px;
}

.page-about .chapter__body h2 {
  margin: 0 0 18px;
  font-size: clamp(21px, 4.4vw, 30px);
  line-height: 1.36;
  font-weight: 700;
  letter-spacing: -0.005em;
}

.page-about .chapter__body > p {
  max-width: var(--measure);
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.86;
}

.page-about .chapter__body > p:last-child {
  margin-bottom: 0;
}

/* ---------- 旁注小卡 ---------- */
.page-about .side-note {
  margin: 0 0 22px;
  padding: 16px 18px;
  background: var(--panel);
  border-left: 2px solid var(--fox);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .side-note__k {
  display: block;
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 26px;
  line-height: 1.1;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--cyan);
}

.page-about .chapter__body .side-note__t {
  max-width: none;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 图片容器 ---------- */
.page-about .about-media {
  position: relative;
  margin: 0 0 26px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

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

.page-about .about-media--hero {
  aspect-ratio: 16 / 10;
}

.page-about .about-media--note {
  aspect-ratio: 9 / 7;
}

.page-about .about-media--season {
  aspect-ratio: 21 / 9;
}

.page-about .about-media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: 94%;
  padding: 7px 14px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--paper);
  background: rgba(13, 17, 22, 0.78);
}

/* ---------- 团队面板 ---------- */
.page-about .crews {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .crews__item {
  padding: 20px 18px 22px;
  background: var(--panel);
  transition: background 0.2s ease;
}

.page-about .crews__item:hover,
.page-about .crews__item:focus-within,
.page-about .crews__item:focus {
  background: linear-gradient(180deg, rgba(255, 74, 28, 0.1), rgba(21, 27, 35, 1) 78%);
  outline: none;
}

.page-about .crews__item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .crews__num {
  display: block;
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 30px;
  line-height: 1;
  font-weight: 500;
  color: var(--fox);
}

.page-about .crews__role {
  display: block;
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .chapter__body .crews__txt {
  max-width: none;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 四条标准 ---------- */
.page-about .rules {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .rules__item {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  column-gap: 12px;
  align-items: start;
  padding: 20px 0 22px;
  border-top: 1px solid var(--line);
}

.page-about .rules__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 28px;
  height: 1px;
  background: var(--fox);
}

.page-about .rules__n {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--fox);
  padding-top: 3px;
}

.page-about .rules__t {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.005em;
}

.page-about .chapter__body .rules__d {
  grid-column: 2;
  max-width: none;
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0 0 24px;
  padding: 0 0 0 28px;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 34px;
}

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

.page-about .timeline__step::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--fox);
  box-shadow: 0 0 0 4px var(--ink), 0 0 16px rgba(255, 74, 28, 0.7);
}

.page-about .timeline__when {
  display: block;
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--round);
}

.page-about .timeline__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .chapter__body .timeline__txt {
  max-width: none;
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .timeline__link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 13.5px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 224, 200, 0.34);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .timeline__link:hover {
  color: var(--ember);
  border-bottom-color: var(--ember);
}

.page-about .timeline__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 收束区 ---------- */
.page-about .about-cta {
  margin-top: 74px;
  padding: 30px 22px 32px;
  display: grid;
  gap: 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--fox);
  background: linear-gradient(122deg, rgba(255, 74, 28, 0.1), rgba(21, 27, 35, 0.92) 62%);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .about-cta__t {
  margin: 0;
  max-width: 40em;
  font-size: 16.5px;
  line-height: 1.76;
  color: var(--paper);
}

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

/* ---------- 中等屏幕 ---------- */
@media (min-width: 640px) {
  .page-about .crews {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    padding: 34px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .timeline__step {
    padding-right: 26px;
  }

  .page-about .timeline__step::before {
    left: 0;
    top: -38px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 32px 30px 34px;
  }
}

/* ---------- 桌面双栏：大编号 + 单栏正文 ---------- */
@media (min-width: 960px) {
  .page-about .about-head {
    padding-top: 44px;
    padding-bottom: 64px;
  }

  .page-about .chapter {
    display: grid;
    grid-template-columns: var(--num-col) minmax(0, 1fr);
    column-gap: var(--num-gap);
    align-items: start;
  }

  .page-about .chapter__rail {
    grid-column: 1;
  }

  .page-about .chapter__num {
    margin: 0;
    font-size: 60px;
    line-height: 1;
    letter-spacing: 0;
    color: transparent;
    -webkit-text-stroke: 1.5px rgba(255, 74, 28, 0.62);
    position: sticky;
    top: 108px;
  }

  @supports not (-webkit-text-stroke: 1px red) {
    .page-about .chapter__num {
      color: var(--fox);
    }
  }

  .page-about .chapter__body {
    grid-column: 2;
  }

  .page-about .chapter__body > p {
    font-size: 16.5px;
  }
}

/* ---------- 旁注与图片浮到正文右侧 ---------- */
@media (min-width: 1040px) {
  .page-about .side-note {
    float: right;
    width: var(--note-w);
    margin: 4px 0 18px 30px;
  }

  .page-about .chapter__body > .about-media--note {
    float: right;
    width: 300px;
    margin: 4px 0 18px 28px;
  }

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

@media (min-width: 1200px) {
  .page-about .about-head h1 {
    letter-spacing: -0.015em;
  }
}
<<<END>>>