.page-about {
  --about-gap: 22px;
  --about-max: 1180px;
  display: block;
  background: var(--pitch-black);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding: 14px var(--gutter) 0;
  max-width: var(--page-max);
  margin: 0 auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--deep-green);
  border-bottom: 1px solid var(--hairline);
  overflow: hidden;
}

.page-about .about-hero__media {
  position: relative;
  height: 230px;
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 64% 50%;
  filter: saturate(.85) contrast(1.08);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 20, 17, .30) 0%, rgba(7, 20, 17, .84) 70%, var(--pitch-black) 100%);
}

.page-about .about-hero__body {
  position: relative;
  padding: 22px var(--gutter) 32px;
  background: linear-gradient(180deg, rgba(11, 32, 25, .78), var(--pitch-black));
}

.page-about .about-hero__body .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(38px, 9vw, 62px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-2);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .hero-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: rgba(18, 42, 34, .92);
}

.page-about .hero-fact__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-fact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-3);
}

/* ---------- 章节索引带 ---------- */
.page-about .chapter-rail {
  display: flex;
  gap: 0;
  overflow-x: auto;
  background: rgba(7, 20, 17, .96);
  border-bottom: 1px solid var(--hairline);
  scrollbar-width: none;
}

.page-about .chapter-rail::-webkit-scrollbar {
  display: none;
}

.page-about .chapter-rail .chapter-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 13px 15px;
  font-size: 13px;
  color: var(--ink-2);
  text-decoration: none;
  white-space: nowrap;
  border-right: 1px solid var(--hairline);
  transition: color 200ms var(--ease-out), background 200ms var(--ease-out);
}

.page-about .chapter-rail .chapter-link .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--ink-3);
}

.page-about .chapter-rail .chapter-link:hover,
.page-about .chapter-rail .chapter-link.is-active {
  color: var(--cyan);
  background: rgba(46, 230, 200, .08);
}

.page-about .chapter-rail .chapter-link:hover .idx,
.page-about .chapter-rail .chapter-link.is-active .idx {
  color: var(--amber);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding: 56px 0;
}

.page-about .sec-head {
  max-width: 34ch;
  margin-bottom: 30px;
}

.page-about .sec-head__title {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(27px, 5.4vw, 42px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .sec-head__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .about-sec .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
  margin: 0;
}

.page-about .about-sec p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-2);
  margin: 0 0 16px;
}

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

/* ---------- 01 起点 ---------- */
.page-about .origin-grid {
  gap: 32px;
}

.page-about .origin-copy p:first-child {
  font-size: 17px;
  color: var(--ink);
}

.page-about .spec-list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .spec-list__item {
  padding: 16px 18px;
  background: var(--panel);
}

.page-about .spec-list__term {
  display: block;
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .spec-list__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ---------- 02 发展历程 ---------- */
.page-about .about-sec--history {
  background: var(--deep-green);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  overflow: hidden;
}

.page-about .timeline__bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.page-about .timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 60%;
  opacity: .16;
}

.page-about .about-sec--history .wrap {
  position: relative;
}

.page-about .timeline {
  position: relative;
  padding-left: 24px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--hairline) 46%, var(--amber) 100%);
}

.page-about .tl-row {
  position: relative;
  border-bottom: 1px solid var(--hairline);
}

.page-about .tl-row::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 21px;
  width: 9px;
  height: 9px;
  background: var(--pitch-black);
  border: 2px solid var(--amber);
  transform: rotate(45deg);
}

.page-about .tl-row > summary {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "idx title"
    "idx meta";
  gap: 3px 14px;
  padding: 16px 34px 16px 2px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-row > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-row > summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .tl-row[open] > summary::after {
  content: "–";
  color: var(--amber);
}

.page-about .tl-idx {
  grid-area: idx;
  align-self: start;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 20px;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .tl-meta {
  grid-area: meta;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-3);
}

.page-about .tl-body {
  padding: 0 34px 20px 2px;
}

.page-about .tl-body p {
  font-size: 14px;
  line-height: 1.76;
  margin: 0;
}

/* ---------- 03 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .role-card {
  position: relative;
  padding: 20px 18px 18px;
  background: var(--panel);
  border: 1px solid var(--hairline);
  clip-path: var(--cut-clip);
  transition: transform 320ms var(--ease-out), background 320ms var(--ease-out), box-shadow 320ms var(--ease-out);
}

.page-about .role-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  opacity: 0;
  transition: opacity 320ms var(--ease-out);
}

.page-about .role-card--key {
  background: var(--panel-raised);
}

.page-about .role-card__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ink-3);
  margin-bottom: 10px;
}

.page-about .role-card__badge {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--pitch-black);
  background: var(--amber);
  clip-path: var(--cut-clip);
}

.page-about .role-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 21px;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .role-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .role-card__daily {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 320ms var(--ease-out), opacity 320ms var(--ease-out), margin-top 320ms var(--ease-out);
}

.page-about .role-card__daily li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--cyan-soft);
}

.page-about .role-card__daily li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

.page-about .role-card:hover,
.page-about .role-card:focus-within {
  transform: translateY(-4px);
  background: var(--panel-raised);
  box-shadow: var(--shadow-float);
}

.page-about .role-card:hover::before,
.page-about .role-card:focus-within::before {
  opacity: 1;
}

.page-about .role-card:hover .role-card__daily,
.page-about .role-card:focus-within .role-card__daily {
  max-height: 200px;
  opacity: 1;
  margin-top: 14px;
}

/* ---------- 04 流程 ---------- */
.page-about .flow-layout {
  gap: 30px;
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
}

.page-about .flow::-webkit-scrollbar {
  display: none;
}

.page-about .flow__item {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  scroll-snap-align: start;
}

.page-about .flow__card {
  width: 172px;
  padding: 16px 14px;
  background: var(--panel);
  border: 1px solid var(--hairline);
  clip-path: var(--cut-clip);
}

.page-about .flow__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 18px;
  color: var(--ink);
}

.page-about .flow__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.66;
  color: var(--ink-2);
}

.page-about .flow__arrow {
  flex: 0 0 auto;
  margin: 0 8px;
  color: var(--cyan);
  transform: rotate(12deg);
  opacity: .75;
}

.page-about .flow-merge {
  margin-top: 22px;
  border: 1px solid var(--hairline);
  background: rgba(18, 42, 34, .6);
  padding: 0;
}

.page-about .flow-merge > summary {
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .flow-merge > summary::-webkit-details-marker {
  display: none;
}

.page-about .flow-merge[open] > summary {
  color: var(--amber);
  border-bottom: 1px solid var(--hairline);
}

.page-about .flow-merge__list {
  list-style: none;
  margin: 0;
  padding: 14px 16px 16px;
  display: grid;
  gap: 10px;
}

.page-about .flow-merge__list li {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .flow-merge__key {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--pitch-black);
  background: var(--cyan);
}

.page-about .flow-figure {
  margin: 0;
  border: 1px solid var(--hairline);
}

.page-about .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .flow-figure .media__label {
  display: block;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--ink-3);
  background: var(--panel);
  border-top: 1px solid var(--hairline);
}

/* ---------- 05 覆盖与合作 ---------- */
.page-about .about-band {
  background: var(--deep-green);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding: 52px 0;
}

.page-about .band-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  margin-bottom: 32px;
}

.page-about .band-stats .stat {
  padding: 18px 16px;
  background: var(--pitch-black);
}

.page-about .band-stats .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 32px;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .band-stats .stat__label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-3);
}

.page-about .coverage-grid {
  gap: 26px;
}

.page-about .coverage-side__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-3);
  margin: 8px 0 0;
}

.page-about .coverage-main p {
  font-size: 15px;
}

/* ---------- 06 更新节奏 ---------- */
.page-about .rhythm-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  margin-bottom: 34px;
}

.page-about .rhythm-card {
  padding: 20px 18px;
  background: var(--panel);
  transition: background 260ms var(--ease-out);
}

.page-about .rhythm-card:hover {
  background: var(--panel-raised);
}

.page-about .rhythm-card__time {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--amber);
  margin-bottom: 10px;
}

.page-about .rhythm-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 20px;
  color: var(--ink);
}

.page-about .rhythm-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
}

.page-about .cluster {
  border-top: 1px solid var(--hairline);
  padding-top: 26px;
}

.page-about .cluster__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .cluster__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 5px;
  padding: 14px 16px;
  background: var(--pitch-black);
}

.page-about .cluster__name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 18px;
  color: var(--cyan);
}

.page-about .cluster__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ---------- 07 联系 ---------- */
.page-about .about-sec--reach {
  border-top: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(11, 32, 25, .7), var(--pitch-black));
}

.page-about .reach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 26px;
}

.page-about .reach-card {
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-left: 2px solid var(--cyan);
}

.page-about .reach-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 19px;
  color: var(--ink);
}

.page-about .reach-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
}

.page-about .reach-contact {
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .reach-contact__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 16px;
  background: var(--pitch-black);
}

.page-about .reach-contact__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--ink-3);
}

.page-about .reach-contact__val {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  word-break: break-word;
}

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

.page-about .reach-links .btn {
  text-decoration: none;
}

/* ---------- 移动端优先之上的断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-sec {
    padding: 68px 0;
  }

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

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

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

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

  .page-about .reach-contact__row {
    grid-template-columns: 120px 1fr;
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    min-height: 600px;
  }

  .page-about .about-hero__media {
    position: absolute;
    inset: 0;
    height: auto;
  }

  .page-about .about-hero__media img {
    object-position: 58% 50%;
  }

  .page-about .about-hero__media::after {
    background: linear-gradient(102deg, rgba(7, 20, 17, .96) 4%, rgba(7, 20, 17, .62) 40%, rgba(7, 20, 17, .12) 76%);
  }

  .page-about .about-hero__body {
    position: relative;
    justify-self: end;
    width: min(620px, 58%);
    margin-left: auto;
    padding: 84px 56px 56px 24px;
    background: linear-gradient(202deg, rgba(7, 20, 17, .90) 12%, rgba(7, 20, 17, .55) 58%, rgba(7, 20, 17, 0) 92%);
  }

  .page-about .about-hero h1 {
    font-size: clamp(46px, 4.6vw, 66px);
  }

  .page-about .timeline {
    padding-left: 30px;
  }

  .page-about .tl-row > summary {
    grid-template-columns: 96px 1fr;
    grid-template-areas:
      "idx title"
      "idx meta";
    padding: 20px 40px 20px 4px;
    align-items: baseline;
  }

  .page-about .tl-row::before {
    left: -29px;
    top: 26px;
  }

  .page-about .tl-title {
    font-size: 23px;
  }

  .page-about .tl-body {
    padding: 0 40px 24px 100px;
  }

  .page-about .tl-body p {
    max-width: 68ch;
  }

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

  .page-about .spec-list__item {
    padding: 20px 22px;
  }

  .page-about .coverage-grid {
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-sec {
    padding: 80px 0;
  }

  .page-about .origin-grid {
    gap: 48px;
  }

  .page-about .flow-layout {
    gap: 48px;
    align-items: start;
  }

  .page-about .flow__card {
    width: 186px;
  }

  .page-about .sec-head {
    margin-bottom: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .role-card__daily,
  .page-about .rhythm-card,
  .page-about .chapter-rail .chapter-link {
    transition: none;
  }

  .page-about .role-card:hover,
  .page-about .role-card:focus-within {
    transform: none;
  }

  .page-about .flow__arrow {
    transform: none;
  }
}