.page-about {
  --ab-gap: clamp(2.2rem, 6vw, 4.4rem);
  --ab-card: var(--pitch-800);
  --ab-line: var(--line-glass);
  --ab-text-soft: rgba(245, 239, 225, .78);
  --ab-text-dim: rgba(245, 239, 225, .6);
  background: var(--pitch-900);
  color: var(--paper);
}

.page-about p {
  font-size: 1rem;
  line-height: 1.78;
  color: var(--ab-text-soft);
}

.page-about .lede {
  font-size: clamp(1.02rem, 2.4vw, 1.14rem);
  line-height: 1.72;
  color: rgba(245, 239, 225, .9);
}

/* ---------- 首屏画板 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.2rem, 3.5vw, 2rem) 0 clamp(2rem, 6vw, 3.6rem);
  border-bottom: 1px solid var(--ab-line);
  background:
    radial-gradient(95% 72% at 86% 0%, rgba(255, 106, 26, .16), transparent 62%),
    linear-gradient(168deg, var(--pitch-800) 0%, var(--pitch-900) 54%, var(--pitch-950) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: 8%;
  width: 44%;
  height: 140%;
  transform: skewX(-15deg);
  background: linear-gradient(180deg, rgba(233, 255, 87, .07), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem 1rem;
  margin: 1.3rem 0 0;
}

.page-about .about-hero__year {
  display: inline-block;
  padding: .25rem .6rem;
  border-radius: var(--r-xs);
  background: var(--neon);
  color: var(--ink);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .06em;
}

.page-about .about-hero__kicker {
  font-size: .84rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--glass);
}

.page-about .about-hero__title {
  margin: 1rem 0 0;
  max-width: 22ch;
  font-size: clamp(1.95rem, 6.6vw, 3.6rem);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 1.2rem 0 0;
  max-width: 56ch;
  font-size: clamp(1rem, 2.5vw, 1.1rem);
  line-height: 1.8;
  color: rgba(245, 239, 225, .84);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.4rem, 4vw, 2.2rem);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  background: var(--ab-line);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .9rem 1rem;
  background: rgba(10, 36, 28, .82);
}

.page-about .about-stat__v {
  font-size: clamp(1.3rem, 4.4vw, 1.7rem);
  font-weight: 700;
  color: var(--orange);
  letter-spacing: -.01em;
}

.page-about .about-stat__k {
  font-size: .8rem;
  line-height: 1.5;
  color: var(--glass);
}

/* ---------- 章节骨架 ---------- */
.page-about .page-about__sec {
  padding: var(--ab-gap) 0;
  border-bottom: 1px solid rgba(168, 182, 177, .14);
}

.page-about .page-about__sec--deep {
  background: linear-gradient(180deg, var(--pitch-950) 0%, var(--pitch-900) 100%);
}

.page-about .page-about__sec--close {
  border-bottom: 0;
}

.page-about .about-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .35rem .9rem;
  margin-bottom: clamp(1.2rem, 4vw, 1.8rem);
}

.page-about .about-head .sec-num {
  color: var(--orange);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-head .sec-title {
  flex: 1 1 14rem;
  margin: 0;
  font-size: clamp(1.3rem, 4vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-head .sec-meta {
  flex: 0 1 auto;
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--steel);
}

.page-about .about-intro {
  max-width: 62ch;
  margin: 0 0 1.4rem;
}

.page-about .about-figure {
  margin: 0 0 clamp(1.4rem, 4vw, 2.2rem);
}

.page-about .about-figure--foot {
  margin: clamp(1.6rem, 5vw, 2.6rem) 0 0;
}

.page-about .about-figure .media__frame {
  border-radius: var(--r-md);
  border: 1px solid var(--ab-line);
  overflow: hidden;
  background: var(--pitch-800);
}

.page-about .about-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media__cap {
  margin-top: .6rem;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .crew-grid {
  gap: clamp(1.4rem, 4vw, 2.4rem);
  align-items: start;
}

.page-about .crew-copy p + p {
  margin-top: .9rem;
}

.page-about .crew-board {
  display: flex;
  flex-direction: column;
  gap: .7rem;
}

.page-about .crew-row {
  padding: .95rem 1.05rem 1.05rem;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(18, 59, 46, .92), rgba(10, 36, 28, .92));
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .crew-row:hover {
  border-color: rgba(255, 106, 26, .5);
  transform: translateY(-2px);
}

.page-about .crew-row__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .crew-row__name {
  font-weight: 700;
  font-size: .98rem;
  color: var(--paper);
}

.page-about .crew-row__count {
  font-size: .95rem;
  font-weight: 700;
  color: var(--neon);
}

.page-about .crew-row__bar {
  margin: .6rem 0 .55rem;
  height: 6px;
  border-radius: 999px;
  background: rgba(168, 182, 177, .2);
  overflow: hidden;
}

.page-about .crew-row__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--orange), var(--neon));
}

.page-about .crew-row:nth-child(1) .crew-row__fill { width: 50%; }
.page-about .crew-row:nth-child(2) .crew-row__fill { width: 27.8%; }
.page-about .crew-row:nth-child(3) .crew-row__fill { width: 22.2%; }

.page-about .crew-row__duty {
  margin: 0;
  font-size: .87rem;
  line-height: 1.7;
  color: var(--ab-text-dim);
}

/* ---------- 历程 ---------- */
.page-about .journey {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .year-rail__list {
  display: grid;
  gap: .18rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .year-rail__link {
  display: grid;
  grid-template-columns: 3.6rem minmax(0, 1fr);
  align-items: baseline;
  gap: .6rem;
  padding: .5rem .75rem;
  border-left: 2px solid rgba(168, 182, 177, .3);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  text-decoration: none;
  transition: border-color .18s var(--ease), background .18s var(--ease), color .18s var(--ease);
}

.page-about .year-rail__link:hover,
.page-about .year-rail__link:focus-visible {
  border-left-color: var(--orange);
  background: rgba(255, 106, 26, .1);
}

.page-about .year-rail__y {
  font-size: .82rem;
  font-weight: 700;
  color: var(--steel);
  letter-spacing: .04em;
}

.page-about .year-rail__link:hover .year-rail__y,
.page-about .year-rail__link:focus-visible .year-rail__y {
  color: var(--neon);
}

.page-about .year-rail__l {
  font-size: .9rem;
  color: var(--ab-text-soft);
}

.page-about .stage-list {
  display: grid;
  gap: .85rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .stage {
  position: relative;
  padding: 1.1rem 1.15rem 1.2rem 1.5rem;
  border-radius: var(--r-md);
  background: rgba(18, 59, 46, .62);
  border: 1px solid var(--ab-line);
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: .9rem;
  bottom: .9rem;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--orange), transparent);
}

.page-about .stage__tag {
  display: inline-block;
  padding: .16rem .5rem;
  border-radius: var(--r-xs);
  background: rgba(233, 255, 87, .14);
  color: var(--neon);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.page-about .stage__title {
  margin: .6rem 0 .45rem;
  font-size: clamp(1.02rem, 3vw, 1.16rem);
  font-weight: 800;
  color: var(--paper);
}

.page-about .stage__text {
  margin: 0;
  max-width: 68ch;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--ab-text-soft);
}

/* ---------- 流程 ---------- */
.page-about .flow-tabs {
  margin-top: 1.2rem;
}

.page-about .flow-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  padding-bottom: .85rem;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .flow-tabs__btn {
  font-family: var(--font-sans);
  font-size: .92rem;
  font-weight: 700;
  color: rgba(245, 239, 225, .74);
  background: rgba(168, 182, 177, .1);
  border: 1px solid var(--ab-line);
  border-radius: 999px;
  padding: .5rem 1.05rem;
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .flow-tabs__btn:hover {
  border-color: rgba(255, 106, 26, .55);
  color: var(--paper);
}

.page-about .flow-tabs__btn[aria-selected="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .flow-panel {
  padding-top: 1.3rem;
}

.page-about .flow-panel__title {
  margin: 0 0 .9rem;
  font-size: clamp(1.02rem, 3vw, 1.16rem);
  font-weight: 800;
  color: var(--paper);
}

.page-about .flow-steps {
  display: grid;
  gap: .7rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: .85rem;
  align-items: start;
  padding: .9rem 1rem;
  border-radius: var(--r-md);
  border: 1px solid var(--ab-line);
  background: rgba(10, 36, 28, .72);
}

.page-about .flow-step__n {
  font-size: .82rem;
  font-weight: 700;
  color: var(--neon);
  padding-top: .18rem;
}

.page-about .flow-step p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.74;
}

/* ---------- 数据 ---------- */
.page-about .data-grid {
  gap: clamp(1.4rem, 4vw, 2.4rem);
  align-items: start;
}

.page-about .data-grid__main p + p {
  margin-top: .9rem;
}

.page-about .quote-panel {
  margin: 1.3rem 0;
  padding: 1.15rem 1.25rem;
  border-radius: var(--r-md);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow-lift);
}

.page-about .quote-panel__text {
  margin: 0;
  font-size: clamp(1rem, 2.8vw, 1.1rem);
  line-height: 1.72;
  font-weight: 700;
  color: var(--ink) !important;
}

.page-about .quote-panel__by {
  margin: .7rem 0 0;
  font-size: .78rem;
  color: var(--ink-mute) !important;
  letter-spacing: .04em;
}

.page-about .data-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .7rem;
}

.page-about .data-fact {
  padding: .85rem 1rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--ab-line);
  background: rgba(18, 59, 46, .6);
}

.page-about .data-fact__v {
  display: block;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--orange);
}

.page-about .data-fact__k {
  display: block;
  margin-top: .3rem;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--glass);
}

.page-about .data-grid__media {
  margin: 0;
}

.page-about .data-grid__media .media__frame {
  border-radius: var(--r-md);
  border: 1px solid var(--ab-line);
  overflow: hidden;
  background: var(--pitch-800);
}

.page-about .data-grid__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 资质与折叠 ---------- */
.page-about .cred-grid {
  gap: clamp(1rem, 3vw, 1.6rem);
  align-items: start;
}

.page-about .cred-col {
  display: grid;
  gap: .7rem;
}

.page-about .fold {
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  background: rgba(18, 59, 46, .6);
  overflow: hidden;
}

.page-about .fold__wrap {
  display: block;
}

.page-about .fold__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .95rem 1.1rem;
  font-size: .96rem;
  font-weight: 700;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}

.page-about .fold__sum::-webkit-details-marker {
  display: none;
}

.page-about .fold__sum::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--orange);
}

.page-about details[open] > .fold__sum::after {
  content: "–";
}

.page-about .fold__sum:hover {
  background: rgba(255, 106, 26, .08);
}

.page-about .fold__body {
  padding: 0 1.1rem 1.1rem;
  display: grid;
  gap: .55rem;
}

.page-about .fold__body p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.76;
}

.page-about .cred-link {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .cred-link:hover {
  color: var(--orange);
}

/* ---------- 收束 ---------- */
.page-about .why-grid {
  gap: .85rem;
  align-items: stretch;
}

.page-about .why-card {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.15rem 1.2rem 1.25rem;
  border-radius: var(--r-md);
  border: 1px solid var(--ab-line);
  background: linear-gradient(158deg, rgba(18, 59, 46, .95), rgba(10, 36, 28, .95));
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .why-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 106, 26, .5);
}

.page-about .why-card .card__num {
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--neon);
}

.page-about .why-card .card__title {
  margin: 0;
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .why-card .card__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.76;
  color: var(--ab-text-soft);
}

.page-about .close-cta {
  margin-top: clamp(1.5rem, 4vw, 2.2rem);
  padding: 1.2rem 1.25rem;
  border-radius: var(--r-md);
  border: 1px solid rgba(255, 106, 26, .38);
  background: linear-gradient(140deg, rgba(255, 106, 26, .14), rgba(10, 36, 28, .9));
}

.page-about .close-cta__text {
  margin: 0 0 1rem;
  max-width: 58ch;
  font-size: .96rem;
  line-height: 1.76;
  color: rgba(245, 239, 225, .88);
}

.page-about .close-cta__btns {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.page-about .close-cta__btns .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .journey {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(1.6rem, 3.5vw, 3rem);
  }

  .page-about .year-rail__list {
    position: sticky;
    top: calc(var(--bar-h) + 1.4rem);
  }

  .page-about .year-rail__item:nth-child(1) .year-rail__link { margin-left: 0; }
  .page-about .year-rail__item:nth-child(2) .year-rail__link { margin-left: .55rem; }
  .page-about .year-rail__item:nth-child(3) .year-rail__link { margin-left: 1.1rem; }
  .page-about .year-rail__item:nth-child(4) .year-rail__link { margin-left: 1.65rem; }
  .page-about .year-rail__item:nth-child(5) .year-rail__link { margin-left: 2.2rem; }
}

@media (min-width: 1040px) {
  .page-about .stage {
    padding: 1.25rem 1.4rem 1.35rem 1.7rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-row,
  .page-about .why-card,
  .page-about .flow-tabs__btn,
  .page-about .year-rail__link {
    transition: none;
  }

  .page-about .crew-row:hover,
  .page-about .why-card:hover {
    transform: none;
  }
}