.page-about {
  --about-rail: 72px;
  --about-shadow: 10px 10px 0 rgba(0, 0, 0, .55);
  position: relative;
  display: block;
  background: var(--c-void);
  color: var(--c-white);
  overflow-x: hidden;
}

/* ---------- 章节索引栏 ---------- */
.page-about .about-rail {
  display: none;
}

@media (min-width: 1101px) {
  .page-about .about-rail {
    position: fixed;
    top: var(--hdr-h, 68px);
    left: 0;
    bottom: 0;
    z-index: 20;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: var(--about-rail);
    padding: 18px 0;
    border-right: 2px solid var(--c-line);
    background: linear-gradient(180deg, rgba(5, 7, 9, .82), rgba(5, 7, 9, .97));
  }

  .page-about .about-rail .rail__item {
    display: grid;
    place-items: center;
    padding: 8px 0;
    font-family: var(--f-mono);
    font-size: 11px;
    letter-spacing: .08em;
    color: var(--c-mist);
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: color .2s ease, border-color .2s ease;
  }

  .page-about .about-rail .rail__item:hover,
  .page-about .about-rail .rail__item:focus-visible,
  .page-about .about-rail .rail__item.is-active {
    color: var(--c-cyan);
    border-left-color: var(--c-cyan);
    outline: none;
  }

  .page-about .container {
    padding-left: calc(var(--gutter) + var(--about-rail));
    max-width: calc(var(--shell) + var(--about-rail));
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(48px, 7vw, 104px) 0 clamp(44px, 6vw, 88px);
  border-bottom: 2px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(620px, 82vw);
  aspect-ratio: 1;
  background: radial-gradient(circle, var(--c-cyan-dim), rgba(5, 7, 9, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: min(340px, 46%);
  height: 2px;
  background: var(--c-cyan);
}

.page-about .about-hero .breadcrumb {
  position: relative;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-about .about-hero__eyebrow {
  position: relative;
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  position: relative;
  margin: 0 0 clamp(20px, 2.6vw, 32px);
  font-family: var(--f-display);
  font-weight: 200;
  font-size: clamp(2.4rem, 6.2vw, 5.4rem);
  line-height: .98;
  letter-spacing: .005em;
}

.page-about .about-hero__lede {
  position: relative;
  max-width: 46ch;
  margin: 0 0 clamp(28px, 3.4vw, 44px);
}

.page-about .about-hero__meta {
  position: relative;
  display: grid;
  gap: 14px;
  margin: 0 0 clamp(26px, 3.2vw, 40px);
  padding: clamp(18px, 2.2vw, 26px) 0 0;
  border-top: 1px solid var(--c-wire);
  max-width: 720px;
}

.page-about .about-hero__meta dt {
  margin: 0 0 4px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-hero__meta dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-mist);
}

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

@media (min-width: 760px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding: clamp(52px, 7.5vw, 108px) 0;
}

.page-about .about-sec__head {
  display: grid;
  gap: 14px;
  max-width: 880px;
  margin-bottom: clamp(28px, 4vw, 56px);
}

.page-about .about-sec__head .eyebrow {
  margin: 0;
}

.page-about .sec-title {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(1.85rem, 4.4vw, 3.5rem);
  line-height: 1.02;
  text-wrap: balance;
}

.page-about .about-sec__head .lede {
  margin: 0;
  max-width: 52ch;
}

/* ---------- 两栏布局 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(26px, 3.4vw, 48px);
}

.page-about .about-split__prose p {
  margin: 0 0 1.1em;
}

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

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
  }

  .page-about .about-split--reverse > .about-split__prose {
    order: 2;
  }

  .page-about .about-split--reverse > .about-school {
    order: 1;
  }
}

/* ---------- 容量清单 ---------- */
.page-about .about-capacity {
  border: 2px solid var(--c-line);
  background: linear-gradient(180deg, rgba(18, 26, 33, .78), rgba(10, 15, 20, .62));
  box-shadow: var(--about-shadow);
}

.page-about .about-capacity__title {
  margin: 0;
  padding: 16px 18px;
  border-bottom: 2px solid var(--c-line);
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: .06em;
  color: var(--c-white);
}

.page-about .about-capacity ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-capacity li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--c-line);
  font-size: 13px;
  line-height: 1.7;
}

.page-about .about-capacity li:last-child {
  border-bottom: 0;
}

.page-about .about-capacity li span {
  color: var(--c-white);
  flex: 0 0 auto;
}

.page-about .about-capacity li em {
  font-family: var(--f-mono);
  font-style: normal;
  font-size: 11.5px;
  text-align: right;
  color: var(--c-cyan);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: clamp(30px, 4vw, 58px) 0 0;
  padding: 0;
}

.page-about .about-figure__frame {
  position: relative;
  border: 2px solid var(--c-line);
  background: var(--c-ink);
  box-shadow: var(--about-shadow);
  overflow: hidden;
}

.page-about .about-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.86) contrast(1.06);
}

.page-about .about-figure__cap {
  display: block;
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--c-mist);
}

.page-about .about-figure--wide .about-figure__frame img {
  aspect-ratio: 21 / 9;
}

.page-about .about-figure--side {
  margin-top: 0;
}

.page-about .about-figure--side .about-figure__frame img {
  aspect-ratio: 4 / 5;
}

/* ---------- 四个功能区 ---------- */
.page-about .about-zones {
  display: grid;
  gap: 2px;
  background: var(--c-line);
  border: 2px solid var(--c-line);
}

.page-about .about-zone {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--c-ink);
  transition: background .25s ease;
}

.page-about .about-zone:hover,
.page-about .about-zone:focus-within {
  background: var(--c-steel);
}

.page-about .about-zone__idx {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-zone h3 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(1.1rem, 1.8vw, 1.45rem);
  line-height: 1.15;
}

.page-about .about-zone p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--c-mist);
}

@media (min-width: 700px) {
  .page-about .about-zones {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1101px) {
  .page-about .about-zones {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(26px, 3.4vw, 48px);
}

@media (min-width: 980px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

.page-about .about-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  margin-bottom: clamp(20px, 2.4vw, 28px);
  border-bottom: 2px solid var(--c-line);
}

.page-about .about-tabs .tabs__tab {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 15px;
  border: 2px solid transparent;
  border-bottom: 0;
  background: transparent;
  color: var(--c-mist);
  font-family: var(--f-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .07em;
  cursor: pointer;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.page-about .about-tabs .tabs__tab .mono {
  font-size: 11.5px;
  color: var(--c-hot);
}

.page-about .about-tabs .tabs__tab:hover {
  color: var(--c-white);
}

.page-about .about-tabs .tabs__tab[aria-selected="true"] {
  color: var(--c-cyan);
  background: var(--c-steel);
  border-color: var(--c-line);
  box-shadow: inset 0 3px 0 var(--c-cyan);
}

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

.page-about .about-tabs .tabs__panel {
  outline: none;
  animation: about-fade .28s ease both;
}

.page-about .about-tabs .tabs__panel[hidden] {
  display: none;
}

.page-about .about-role__lead {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-white);
}

.page-about .about-role__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-role__list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .about-role__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 10px;
  height: 2px;
  background: var(--c-cyan);
}

@keyframes about-fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 赛季数字 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 2px;
  margin-bottom: clamp(28px, 3.6vw, 48px);
  background: var(--c-line);
  border: 2px solid var(--c-line);
}

.page-about .about-stat {
  display: grid;
  gap: 6px;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--c-void);
}

.page-about .about-stat__num {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--c-mist);
}

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-seasons__text {
  max-width: 60ch;
  margin: 0 0 clamp(28px, 3.6vw, 48px);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .about-phase {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--c-line);
  border: 2px solid var(--c-line);
  counter-reset: none;
}

.page-about .about-phase__node {
  position: relative;
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--c-void);
  border-top: 2px solid transparent;
  transition: border-color .25s ease, background .25s ease;
}

.page-about .about-phase__node:hover {
  background: var(--c-ink);
  border-top-color: var(--c-cyan);
}

.page-about .about-phase__step {
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-hot);
}

.page-about .about-phase__node h3 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
}

.page-about .about-phase__node p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--c-mist);
}

@media (min-width: 760px) {
  .page-about .about-phase {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 校园赛道 ---------- */
.page-about .about-school {
  padding: clamp(22px, 2.8vw, 34px);
}

.page-about .about-school h3 {
  margin: 12px 0 14px;
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  line-height: 1.2;
}

.page-about .about-school p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--c-mist);
}

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

/* ---------- 到店四步 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 2px;
  margin: 0 0 clamp(30px, 4vw, 54px);
  padding: 0;
  list-style: none;
  background: var(--c-line);
  border: 2px solid var(--c-line);
}

.page-about .about-steps__item {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--c-ink);
}

.page-about .about-steps__num {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-cyan);
}

.page-about .about-steps__item h3 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(1.05rem, 1.7vw, 1.35rem);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--c-mist);
}

@media (min-width: 700px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1101px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 20px;
  padding: clamp(24px, 3.2vw, 40px);
  border: 2px solid var(--c-cyan);
  background: linear-gradient(135deg, rgba(34, 224, 208, .1), rgba(5, 7, 9, .95) 62%);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, .55);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-white);
}

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

@media (min-width: 900px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-tabs .tabs__panel {
    animation: none;
  }

  .page-about .about-zone,
  .page-about .about-phase__node,
  .page-about .about-rail .rail__item {
    transition: none;
  }
}