.page-about {
  --about-rail-w: 128px;
  --about-panel: rgba(22, 50, 79, 0.44);
  --about-hair: rgba(90, 110, 130, 0.3);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(18px, 4vw, 34px);
  padding-bottom: clamp(40px, 7vw, 84px);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(95% 75% at 92% -12%, rgba(255, 107, 44, 0.16), transparent 62%),
    radial-gradient(70% 60% at 4% 0%, rgba(47, 227, 210, 0.09), transparent 58%);
}

.page-about .about-hero-grid {
  margin-top: clamp(22px, 4vw, 40px);
}

.page-about .about-hero-copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 5.6vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-hero-copy .lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .stat {
  padding: 14px 8px 14px 0;
  min-width: 0;
}

.page-about .stat + .stat {
  padding-left: 12px;
  border-left: 1px solid var(--line-soft);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(19px, 3.4vw, 30px);
  line-height: 1.1;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .stat-num em {
  font-style: normal;
  font-size: 0.46em;
  color: var(--orange);
  margin-left: 3px;
  letter-spacing: 0.02em;
}

.page-about .stat-label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-dim);
  letter-spacing: 0.03em;
}

.page-about .about-hero-figure {
  position: relative;
  margin: 28px 0 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background: var(--abyss);
  overflow: hidden;
}

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

.page-about .about-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(10, 22, 34, 0.6));
  pointer-events: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapters {
  padding-top: clamp(32px, 6vw, 72px);
}

.page-about .about-chapter {
  display: grid;
  gap: 14px;
  padding: clamp(24px, 4vw, 40px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter-rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 20px;
  line-height: 1;
  color: var(--orange);
}

.page-about .chapter-label {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-dim);
}

.page-about .chapter-body {
  min-width: 0;
}

.page-about .chapter-body h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.28;
  color: var(--ink);
}

.page-about .chapter-body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

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

.page-about .chapter-body .link-arrow {
  margin-top: 4px;
  display: inline-flex;
}

.page-about .about-list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 9px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-list strong {
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 双线流程 ---------- */
.page-about .flow {
  margin: 22px 0 0;
  padding: clamp(16px, 3vw, 26px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(160deg, rgba(22, 50, 79, 0.62), rgba(15, 33, 54, 0.4)),
    var(--abyss);
}

.page-about .flow-track + .flow-track {
  margin-top: 20px;
}

.page-about .flow-track-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .flow-step {
  position: relative;
  padding: 12px 14px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background: var(--about-panel);
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .flow-step:hover {
  border-color: rgba(47, 227, 210, 0.6);
  background: rgba(22, 50, 79, 0.9);
}

.page-about .flow-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange-soft);
  border-bottom: 1px solid rgba(255, 162, 107, 0.6);
  padding-bottom: 2px;
}

.page-about .flow-step h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.4;
}

.page-about .flow-step p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-dim);
}

.page-about .flow-merge {
  position: relative;
  margin-top: 26px;
  display: flex;
  justify-content: center;
}

.page-about .flow-merge::before {
  content: "";
  position: absolute;
  top: -26px;
  left: 50%;
  width: 2px;
  height: 26px;
  transform: translateX(-1px);
  background: linear-gradient(180deg, var(--line-mid), var(--orange));
}

.page-about .flow-merge span {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #0A1622;
  background: var(--orange);
  padding: 9px 22px;
  border-radius: var(--pill);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 22px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-dim);
  opacity: 0.85;
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage-grid {
  display: grid;
  gap: 20px;
}

.page-about .coverage-grid .about-figure {
  margin-top: 0;
}

/* ---------- 团队与联系 ---------- */
.page-about .about-cta {
  margin-top: 22px;
  padding: clamp(20px, 3.4vw, 30px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-mid);
  background:
    linear-gradient(145deg, rgba(255, 107, 44, 0.16), rgba(47, 227, 210, 0.08) 72%),
    var(--abyss);
  display: grid;
  gap: 18px;
}

.page-about .about-cta-copy h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  color: var(--ink);
  line-height: 1.3;
}

.page-about .about-cta-copy p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-contact {
  list-style: none;
  margin: 4px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 12px;
}

.page-about .about-contact li {
  min-width: 0;
}

.page-about .about-contact-label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange-soft);
  margin-bottom: 3px;
}

.page-about .about-contact-value {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink);
  word-break: break-word;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .flow-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .flow-step::after {
    content: "";
    position: absolute;
    top: 26px;
    left: 100%;
    width: 26px;
    height: 2px;
    background: linear-gradient(90deg, var(--line-mid), rgba(90, 110, 130, 0));
  }

  .page-about .flow-step:last-child::after {
    display: none;
  }
}

@media (min-width: 780px) {
  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: center;
    gap: 32px;
  }

  .page-about .about-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-hero-figure {
    margin-top: 0;
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(24px, 5vw, 68px);
  }

  .page-about .chapter-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    border-left: 0;
    border-top: 2px solid var(--orange);
    padding: 12px 0 0;
    position: sticky;
    top: 96px;
  }

  .page-about .chapter-num {
    font-size: 28px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 28px;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }

  .page-about .about-contact {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-step {
    transition: none;
  }
}