.page-about {
  --ab-rail: 22%;
  --ab-gap-lg: 52px;
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.85;
  padding-bottom: 8px;
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 20px;
}

/* ---------------- 首屏 ---------------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 52px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -200px;
  right: -140px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(63, 227, 206, .15), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .about-crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .15s var(--ease), border-color .15s var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--line-strong);
}

.page-about .about-crumbs__sep {
  color: var(--cyan-deep);
}

.page-about .about-crumbs__now {
  color: var(--text);
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: 12.5px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 8.4vw, 58px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 0 0 26px;
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--muted);
}

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

.page-about .about-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform .15s var(--ease), background .15s var(--ease),
              border-color .15s var(--ease), color .15s var(--ease);
}

.page-about .about-btn--primary {
  background: var(--amber);
  color: #14100a;
  border: 1px solid var(--amber);
}

.page-about .about-btn--primary:hover,
.page-about .about-btn--primary:focus-visible {
  background: var(--amber-soft);
  border-color: var(--amber-soft);
  transform: translateY(-1px);
}

.page-about .about-btn--ghost {
  background: var(--glass);
  color: var(--text);
  border: 1px solid var(--line-2);
}

.page-about .about-btn--ghost:hover,
.page-about .about-btn--ghost:focus-visible {
  color: var(--cyan);
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.page-about .about-hero__visual {
  position: relative;
  width: 100%;
  max-width: 380px;
  margin-inline: auto;
  aspect-ratio: 1 / 1;
}

.page-about .about-hero__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.page-about .about-hero__stamp {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.page-about .about-hero__stamp-num {
  font-family: var(--font-mono);
  font-size: clamp(64px, 15vw, 112px);
  font-weight: 600;
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--cyan);
  text-shadow: 0 0 42px rgba(63, 227, 206, .34);
}

.page-about .about-hero__stamp-cap {
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--muted);
}

.page-about .about-hero__side {
  position: absolute;
  right: 0;
  top: 10%;
  writing-mode: vertical-rl;
  font-size: 11.5px;
  letter-spacing: .3em;
  color: var(--muted);
}

/* ---------------- 章节骨架 ---------------- */

.page-about .about-chapter {
  position: relative;
  padding: 58px 0;
}

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

.page-about .about-grid {
  display: grid;
  gap: 22px;
}

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-rail__index {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-rail__note {
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-body h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.32;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-body > p {
  margin: 0 0 15px;
  color: var(--text);
  opacity: .86;
  line-height: 1.9;
}

.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  object-fit: cover;
  background: linear-gradient(155deg, var(--ink-800), var(--ink-900));
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------------- 团队卡片 ---------------- */

.page-about .about-team {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
}

.page-about .team-card {
  padding: 20px 18px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(8px);
  transition: transform .15s var(--ease), border-color .15s var(--ease),
              background .15s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  background: var(--glass-2);
}

.page-about .team-card__count {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0 0 8px;
}

.page-about .team-card__num {
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-card__unit {
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .team-card__role {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .team-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-card__tags li {
  padding: 3px 10px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--cyan);
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .team-card__tags {
    opacity: .5;
    transition: opacity .18s var(--ease);
  }
  .page-about .team-card:hover .team-card__tags,
  .page-about .team-card:focus-within .team-card__tags {
    opacity: 1;
  }
}

/* ---------------- 四道工序 ---------------- */

.page-about .about-flow {
  margin: 26px 0 0;
}

.page-about .about-flow__rail {
  margin-bottom: 6px;
}

.page-about .about-flow__rail svg {
  display: block;
  width: 100%;
  height: 22px;
}

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

.page-about .about-step {
  padding: 15px 16px 14px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--ink-800);
  transition: border-color .15s var(--ease), background .15s var(--ease);
}

.page-about .about-step:hover {
  border-color: var(--line-strong);
}

.page-about .about-step__head {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font-family: inherit;
  font-size: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-step__head:focus-visible {
  outline: none;
}

.page-about .about-step__head:focus-visible .about-step__name {
  color: var(--cyan);
}

.page-about .about-step__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan-deep);
}

.page-about .about-step__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--text);
  transition: color .15s var(--ease);
}

.page-about .about-step__icon {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-left: auto;
}

.page-about .about-step__icon::before,
.page-about .about-step__icon::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform .18s var(--ease), opacity .18s var(--ease);
}

.page-about .about-step__icon::before {
  left: 0;
  right: 0;
  top: 6px;
  height: 1.5px;
}

.page-about .about-step__icon::after {
  top: 0;
  bottom: 0;
  left: 6px;
  width: 1.5px;
}

.page-about .about-step[data-open] .about-step__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .about-step__sum {
  margin: 8px 0 0 30px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-step__panel {
  display: none;
  margin: 10px 0 0 30px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-2);
}

.page-about .about-step[data-open] .about-step__panel {
  display: block;
}

.page-about .about-step__panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------------- 栏目筛选与卡片 ---------------- */

.page-about .about-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 10px;
}

.page-about .about-filter {
  appearance: none;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
  transition: color .15s var(--ease), border-color .15s var(--ease),
              background .15s var(--ease);
}

.page-about .about-filter:hover,
.page-about .about-filter:focus-visible {
  color: var(--cyan);
  border-color: var(--line-strong);
  outline: none;
}

.page-about .about-filter[aria-pressed="true"] {
  background: var(--amber);
  border-color: var(--amber);
  color: #14100a;
  font-weight: 600;
}

.page-about .about-filters__meta {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-filters__empty {
  margin: 0 0 16px;
  font-size: 14px;
  color: var(--muted);
}

.page-about .column-grid {
  display: grid;
  gap: 12px;
}

.page-about .column-card {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--ink-800);
  text-decoration: none;
  color: inherit;
  transition: transform .15s var(--ease), border-color .15s var(--ease),
              background .15s var(--ease);
}

.page-about .column-card:hover,
.page-about .column-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  background: var(--ink-700);
  outline: none;
}

.page-about .column-card__cadence {
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .column-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}

.page-about .column-card__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------------- 赛季时间线 ---------------- */

.page-about .season-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 24px 0 18px;
}

.page-about .season-pill {
  appearance: none;
  padding: 6px 13px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 12.5px;
  letter-spacing: .06em;
  cursor: pointer;
  transition: color .15s var(--ease), border-color .15s var(--ease),
              background .15s var(--ease);
}

.page-about .season-pill:hover,
.page-about .season-pill:focus-visible {
  color: var(--cyan);
  border-color: var(--line-strong);
  outline: none;
}

.page-about .season-pill[aria-pressed="true"] {
  background: var(--glass-2);
  border-color: var(--line-strong);
  color: var(--cyan);
}

.page-about .season-track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--line-2);
  display: grid;
  gap: 18px;
}

.page-about .season-item {
  position: relative;
  display: grid;
  gap: 4px;
}

.page-about .season-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 227, 206, .13);
}

.page-about .season-item__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan-deep);
}

.page-about .season-item__body h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--text);
}

.page-about .season-item__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------------- 三条承诺 ---------------- */

.page-about .about-chapter--pledge {
  padding-bottom: 72px;
}

.page-about .pledge-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .pledge {
  position: relative;
  padding: 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(6px);
  transition: border-color .15s var(--ease), transform .15s var(--ease);
}

.page-about .pledge:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .pledge__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--amber);
}

.page-about .pledge h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
}

.page-about .pledge p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------------- 滚动进入 ---------------- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------------- 响应式 ---------------- */

@media (min-width: 620px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-filters {
    gap: 10px;
  }

  .page-about .pledge {
    padding: 22px 22px 22px 76px;
  }

  .page-about .pledge__num {
    position: absolute;
    left: 24px;
    top: 24px;
    margin: 0;
    font-size: 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    padding-inline: 32px;
  }

  .page-about .about-hero {
    padding: 40px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    column-gap: 56px;
  }

  .page-about .about-hero__visual {
    max-width: 420px;
    margin-inline: 0 0;
    justify-self: end;
  }

  .page-about .about-chapter {
    padding: 92px 0;
  }

  .page-about .about-grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    column-gap: var(--ab-gap-lg);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    padding-top: 6px;
  }

  .page-about .about-rail__note {
    writing-mode: vertical-rl;
    letter-spacing: .34em;
    max-height: 220px;
  }

  .page-about .about-body h2 {
    margin-bottom: 20px;
  }

  .page-about .about-body > p {
    max-width: 34em;
  }
}

@media (min-width: 1080px) {
  .page-about .column-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 899px) {
  .page-about .about-hero__side {
    display: none;
  }

  .page-about .about-rail__index {
    min-width: 46px;
  }
}

@media (max-width: 559px) {
  .page-about .about-hero__stamp-num {
    font-size: 76px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-btn,
  .page-about .team-card,
  .page-about .column-card,
  .page-about .pledge,
  .page-about .about-step__icon::before,
  .page-about .about-step__icon::after {
    transition: none;
  }
}