.page-about {
  --about-rail: 3.5rem;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-topline {
  max-width: var(--wide-max);
  margin: 0 auto;
  padding: 14px var(--gutter) 0;
}

.page-about .about-bc-sep {
  margin: 0 .55em;
  color: var(--line-dark-2);
}

.page-about .about-hero {
  max-width: var(--wide-max);
  margin: 0 auto;
  padding: clamp(22px, 4vw, 38px) var(--gutter) clamp(34px, 5vw, 64px);
}

.page-about .hero-grid {
  display: grid;
  gap: 2rem;
}

.page-about .hero-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.85rem, 5.2vw, 3.1rem);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .hero-lead {
  margin: 1.1rem 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--mist);
}

.page-about .hero-lead--sub {
  margin-top: .8rem;
  font-size: .93rem;
  color: rgba(201, 212, 240, .72);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.6rem;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-m);
  overflow: hidden;
  align-self: start;
}

.page-about .stat {
  display: grid;
  gap: .3rem;
  padding: .85rem 1rem;
  background: linear-gradient(150deg, rgba(27, 58, 143, .48), rgba(10, 16, 48, .95));
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--gold);
}

.page-about .stat-key {
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 段落导语 ---------- */
.page-about .section-lead {
  margin: 1.3rem 0 1.5rem;
  max-width: 62ch;
  font-size: .97rem;
  line-height: 1.95;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-bottom: clamp(2.4rem, 6vw, 4rem);
}

.page-about .timeline-wrap {
  padding-top: .4rem;
}

.page-about .about-figure {
  margin: 0 0 1.8rem;
  border: 1px solid var(--line-cream);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--paper-deep);
}

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

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

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: 0 1rem;
  padding-bottom: 1.6rem;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail) / 2 - 1px);
  top: 2.6rem;
  bottom: -.2rem;
  width: 2px;
  background: linear-gradient(180deg, rgba(232, 179, 74, .6), rgba(47, 107, 224, .28));
}

.page-about .tl-item:last-child::before {
  display: none;
}

.page-about .tl-mark {
  display: flex;
  justify-content: center;
  padding-top: .2rem;
}

.page-about .tl-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid rgba(232, 179, 74, .5);
  border-radius: 50%;
  background: rgba(232, 179, 74, .09);
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 700;
  color: var(--gold);
}

.page-about .tl-card {
  background: var(--cream);
  color: var(--ink);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-m);
  padding: clamp(1rem, 3vw, 1.5rem);
  box-shadow: var(--shadow-paper);
}

.page-about .tl-era {
  display: inline-block;
  margin: 0;
  padding: .2rem .55rem;
  border: 1px solid rgba(27, 58, 143, .3);
  border-radius: var(--radius-s);
  background: rgba(27, 58, 143, .07);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--cobalt);
}

.page-about .tl-title {
  margin: .7rem 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.08rem, 2.4vw, 1.35rem);
  line-height: 1.4;
  letter-spacing: -.01em;
  color: #101a33;
}

.page-about .tl-text {
  margin: .65rem 0 0;
  font-size: .95rem;
  line-height: 1.9;
  color: #2c3characters;
  color: #2c3a57;
}

.page-about .tl-note {
  margin-top: .9rem;
  padding-top: .7rem;
  border-top: 1px dashed rgba(16, 26, 51, .2);
}

.page-about .tl-note > summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .05em;
  color: var(--cobalt);
}

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

.page-about .tl-note > summary::after {
  content: "+";
  margin-left: .5em;
  color: var(--cobalt-bright);
}

.page-about .tl-note[open] > summary::after {
  content: "−";
}

.page-about .tl-note p {
  margin: .6rem 0 0;
  font-size: .88rem;
  line-height: 1.85;
  color: #3a4864;
}

.page-about .tl-back {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  margin-top: .4rem;
  padding: .5rem .9rem;
  border: 1px solid var(--line-dark-2);
  border-radius: 999px;
  color: var(--mist);
  font-size: .82rem;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .tl-back:hover {
  color: var(--cream);
  border-color: var(--cobalt-bright);
}

/* ---------- 内容整理 ---------- */
.page-about .about-making {
  padding-bottom: clamp(2.4rem, 6vw, 4rem);
}

.page-about .making-grid {
  display: grid;
  gap: 1.6rem;
}

.page-about .about-tile {
  margin: 0;
  border: 1px solid var(--line-cream);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--paper-deep);
}

.page-about .tracks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .track {
  padding: 1.1rem 1.15rem;
  background: linear-gradient(160deg, rgba(27, 58, 143, .26), rgba(10, 16, 48, .96));
}

.page-about .track-key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .track-name {
  margin: .5rem 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--cream);
}

.page-about .track-text {
  margin: .45rem 0 0;
  font-size: .9rem;
  line-height: 1.88;
  color: var(--mist);
}

/* ---------- 收录标准 ---------- */
.page-about .about-gate {
  padding-bottom: clamp(2.4rem, 6vw, 4rem);
}

.page-about .gate-paper {
  background: var(--cream);
  color: var(--ink);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-l);
  padding: clamp(1.1rem, 3vw, 2rem);
  box-shadow: var(--shadow-paper);
}

.page-about .gate-head {
  display: grid;
  gap: .4rem;
  padding-bottom: .6rem;
  border-bottom: 2px solid rgba(16, 26, 51, .18);
}

.page-about .gate-head-key,
.page-about .gate-head-val {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: rgba(16, 26, 51, .5);
}

.page-about .gate-row {
  display: grid;
  gap: .35rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .gate-row:last-child {
  border-bottom: 0;
  padding-bottom: .2rem;
}

.page-about .gate-key {
  font-family: var(--font-mono);
  font-size: .84rem;
  letter-spacing: .08em;
  color: var(--cobalt);
}

.page-about .gate-val {
  margin: 0;
  font-size: .94rem;
  line-height: 1.9;
  color: #26334e;
}

/* ---------- 服务方式 ---------- */
.page-about .about-routes {
  padding-bottom: clamp(2.4rem, 6vw, 4rem);
}

.page-about .routes {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-dark-2);
}

.page-about .route {
  display: grid;
  gap: .4rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .route-num {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .route-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.06rem;
  line-height: 1.45;
  color: var(--cream);
}

.page-about .route-text {
  margin: 0;
  font-size: .91rem;
  line-height: 1.88;
  color: var(--mist);
}

.page-about .route-link {
  justify-self: start;
  margin-top: .2rem;
  color: var(--cobalt-bright);
  font-size: .86rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 107, 224, .55);
  padding-bottom: 1px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .route-link:hover {
  color: var(--neon);
  border-color: var(--neon);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  padding-bottom: clamp(2.4rem, 6vw, 4rem);
}

.page-about .cadence-grid {
  display: grid;
  gap: 1.6rem;
}

.page-about .cadence-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  gap: .9rem;
}

.page-about .cadence-item {
  display: grid;
  gap: .2rem;
  padding-left: .9rem;
  border-left: 3px solid var(--cobalt);
}

.page-about .cadence-key {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--jade);
}

.page-about .cadence-note {
  margin: 0;
  font-size: .91rem;
  line-height: 1.88;
  color: var(--mist);
}

.page-about .about-flow {
  margin: 0;
  border: 1px solid var(--line-cream);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--paper-deep);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 0 0 clamp(2.6rem, 7vw, 4.5rem);
}

.page-about .cta-inner {
  display: grid;
  gap: 1.2rem;
  padding: clamp(1.4rem, 4vw, 2.4rem);
  border: 1px solid var(--line-cream);
  border-radius: var(--radius-l);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(47, 107, 224, .38), transparent 58%),
    linear-gradient(160deg, rgba(27, 58, 143, .5), rgba(10, 16, 48, .96));
}

.page-about .cta-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  line-height: 1.35;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .cta-note {
  margin: .6rem 0 0;
  max-width: 56ch;
  font-size: .93rem;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 宽屏 ---------- */
@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: end;
  }

  .page-about .making-grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: 2.6rem;
    align-items: start;
  }

  .page-about .gate-head {
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: 1.5rem;
  }

  .page-about .gate-row {
    grid-template-columns: 11rem minmax(0, 1fr);
    align-items: baseline;
    gap: 1.5rem;
    padding: 1.1rem 0;
  }

  .page-about .route {
    grid-template-columns: 4rem 13rem minmax(0, 1fr) auto;
    align-items: baseline;
    gap: 1.4rem;
    padding: 1.35rem 0;
  }

  .page-about .route-link {
    justify-self: end;
    margin-top: 0;
    white-space: nowrap;
  }

  .page-about .cadence-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 2.6rem;
    align-items: start;
  }

  .page-about .cta-inner {
    grid-template-columns: minmax(0, 1.4fr) auto;
    align-items: center;
    gap: 2rem;
  }
}

@media (min-width: 1180px) {
  .page-about .timeline-wrap {
    padding-left: 2.5rem;
  }

  .page-about .tl-item {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 1.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .route-link,
  .page-about .tl-back {
    transition: none;
  }
}
</main>