.page-about {
  background: var(--paper);
  color: var(--body);
}

/* ---------- 卷首 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 40px;
  background: var(--indigo);
  color: var(--paper);
  border-bottom: 2px solid var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 42%;
  background-image: repeating-linear-gradient(90deg, rgba(217, 163, 64, .16) 0 1px, transparent 1px 46px);
  pointer-events: none;
}

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

.page-about .about-crumbs {
  margin: 0 0 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(245, 240, 230, .58);
}

.page-about .about-crumbs a {
  color: rgba(245, 240, 230, .9);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 240, 230, .3);
}

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

.page-about .about-crumbs .crumbs-sep {
  margin: 0 8px;
  color: rgba(245, 240, 230, .38);
}

.page-about .hero-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-hero .kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-hero h1 {
  max-width: 15em;
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-size: clamp(30px, 6.6vw, 54px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-hero .lead {
  max-width: 44em;
  margin: 0;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(245, 240, 230, .86);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: rgba(245, 240, 230, .26);
  border: 1px solid rgba(245, 240, 230, .3);
}

.page-about .hero-facts > div {
  padding: 14px 16px 16px;
  background: rgba(13, 18, 32, .38);
}

.page-about .hero-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .hero-facts dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.1;
  color: var(--white);
}

.page-about .hero-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid rgba(245, 240, 230, .22);
}

.page-about .hero-jump a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(245, 240, 230, .82);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(245, 240, 230, .28);
}

.page-about .hero-jump a:hover {
  color: var(--teal);
  border-bottom-color: var(--teal);
}

/* ---------- 章节骨架 ---------- */
.page-about .section {
  padding: 48px 0;
}

.page-about .section-open {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding-bottom: 16px;
  margin-bottom: 26px;
  border-bottom: 2px solid var(--ink);
}

.page-about .section-no {
  padding-top: 7px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .12em;
  color: var(--gold-deep);
}

.page-about .section-open h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .band-indigo .section-open {
  border-bottom-color: var(--gold);
}

.page-about .band-indigo .section-no {
  color: var(--gold);
}

.page-about .band-indigo .section-open h2 {
  color: var(--white);
}

/* ---------- 01 主站角色 ---------- */
.page-about .role-split {
  display: grid;
  gap: 24px;
}

.page-about .quote-block {
  margin: 0;
  padding: 20px 22px;
  background: var(--paper-2);
  border-left: 2px solid var(--ink);
}

.page-about .quote-block p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 02 五个索引分区 ---------- */
.page-about .zone-intro {
  margin: 0 0 26px;
}

.page-about .zone-figure,
.page-about .tl-figure,
.page-about .team-figure {
  margin: 0 0 30px;
}

.page-about .zone-figure .figure-frame,
.page-about .tl-figure .figure-frame,
.page-about .team-figure .figure-frame {
  border: 2px solid var(--ink);
  box-shadow: var(--hard);
  background: var(--white);
}

.page-about .zone-figure img,
.page-about .tl-figure img,
.page-about .team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--body);
}

.page-about .zone-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .zone-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-bottom: 2px solid var(--ink);
}

.page-about .zone-item-archive {
  border-bottom-style: dashed;
  border-bottom-color: var(--archive);
}

.page-about .zone-code {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--gold-deep);
  padding-top: 3px;
}

.page-about .zone-item-archive .zone-code {
  color: var(--archive);
}

.page-about .zone-body h3 {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 21px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .zone-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  padding: 3px 8px;
  background: var(--indigo);
  color: var(--paper);
}

.page-about .zone-tag-archive {
  background: var(--archive);
  color: var(--white);
}

.page-about .zone-body p {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--body);
  max-width: 46em;
}

.page-about .zone-body .zone-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--teal-deep);
}

.page-about .zone-item-archive .zone-body .zone-meta {
  color: var(--archive);
}

.page-about .zone-copy {
  margin-top: 4px;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink);
  background: transparent;
  border: 2px solid var(--ink);
  cursor: pointer;
}

.page-about .zone-copy:hover {
  border-color: var(--teal-deep);
  color: var(--teal-deep);
}

.page-about .zone-copy:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

/* ---------- 03 典型场景 ---------- */
.page-about .scene-grid {
  display: grid;
  gap: 16px;
}

.page-about .scene-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 20px 22px;
  background: var(--white);
  border: 2px solid var(--ink);
}

.page-about .scene-no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold-deep);
}

.page-about .scene-card h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .scene-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body);
}

.page-about .scene-link {
  margin-top: auto;
  padding-top: 12px;
  font-size: 14px;
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1px solid var(--paper-2);
  align-self: flex-start;
}

.page-about .scene-link:hover {
  color: var(--teal-deep);
  border-bottom-color: var(--teal);
}

/* ---------- 04 团队 ---------- */
.page-about .team-split {
  display: grid;
  gap: 30px;
}

.page-about .team-list {
  border-top: 2px solid var(--ink);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--paper-2);
}

.page-about .team-num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--indigo);
}

.page-about .team-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .team-desc {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body);
}

.page-about .team-total {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .team-total .mono {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--gold-deep);
}

/* ---------- 05 时间线 ---------- */
.page-about .timeline {
  display: flex;
  gap: 0;
  margin: 0 0 30px;
  padding: 4px 0 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  border-top: 2px solid var(--ink);
}

.page-about .tl-item {
  position: relative;
  flex: 0 0 min(76vw, 250px);
  padding: 22px 22px 8px 0;
  margin-right: 22px;
  border-right: 1px dashed var(--archive);
  scroll-snap-align: start;
}

.page-about .tl-item:last-child {
  border-right: none;
  margin-right: 0;
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--gold-deep);
}

.page-about .tl-dot {
  display: block;
  width: 12px;
  height: 12px;
  margin: 12px 0 14px;
  background: var(--gold);
  border: 2px solid var(--ink);
}

.page-about .tl-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .tl-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--body);
}

/* ---------- 06 更新节奏 ---------- */
.page-about .cadence-grid {
  display: grid;
  gap: 1px;
  background: var(--paper-2);
  border: 2px solid var(--ink);
}

.page-about .cadence-cell {
  padding: 22px 20px 24px;
  background: var(--paper);
}

.page-about .cadence-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--teal-deep);
}

.page-about .cadence-cell h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .cadence-cell p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body);
}

/* ---------- 07 协作生态 ---------- */
.page-about .eco-split {
  display: grid;
  gap: 28px;
}

.page-about .eco-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .eco-figures li {
  padding: 18px 20px;
  background: var(--paper-2);
  border-left: 2px solid var(--teal-deep);
}

.page-about .eco-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--indigo);
}

.page-about .eco-label {
  display: block;
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .eco-figures p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--body);
}

/* ---------- 08 服务承诺 ---------- */
.page-about .promise-grid {
  display: grid;
  gap: 1px;
  background: rgba(245, 240, 230, .24);
  border: 1px solid rgba(245, 240, 230, .3);
}

.page-about .promise-cell {
  padding: 22px 20px 26px;
  background: rgba(13, 18, 32, .42);
}

.page-about .promise-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--gold);
}

.page-about .promise-label {
  margin: 14px 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .promise-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(245, 240, 230, .72);
}

/* ---------- 收束 ---------- */
.page-about .about-cta .cta-inner {
  max-width: 720px;
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(24px, 4.4vw, 34px);
  line-height: 1.2;
  color: var(--ink);
}

.page-about .about-cta p {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--body);
}

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

.page-about .cta-actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 100px 0 52px;
  }

  .page-about .section {
    padding: 64px 0;
  }

  .page-about .section-open {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 18px;
    margin-bottom: 32px;
  }

  .page-about .zone-item {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 20px;
    padding: 26px 0;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: 7fr 5fr;
    gap: 44px;
    align-items: end;
  }

  .page-about .role-split {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 44px;
    align-items: start;
  }

  .page-about .eco-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .section {
    padding: 78px 0;
  }

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

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

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

  .page-about .tl-item {
    flex: 0 0 250px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline {
    scroll-behavior: auto;
  }
}