.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ===== Hero ===== */
.page-about .ab-hero {
  position: relative;
  padding: calc(var(--header-h) + 24px) 0 52px;
  background:
    radial-gradient(120% 100% at 86% -12%, rgba(255, 107, 53, 0.16), transparent 58%),
    linear-gradient(180deg, var(--ink) 0%, var(--night) 100%);
  border-bottom: 1px solid var(--steel);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(30, 58, 99, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 58, 99, 0.5) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(82% 76% at 72% 18%, #000 18%, transparent 86%);
  mask-image: radial-gradient(82% 76% at 72% 18%, #000 18%, transparent 86%);
  pointer-events: none;
}

.page-about .ab-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .ab-rail {
  display: none;
}

.page-about .ab-hero-main {
  min-width: 0;
  max-width: 880px;
}

.page-about .ab-eyebrow {
  margin: 22px 0 0;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--signal);
  text-transform: uppercase;
}

.page-about .ab-h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.6vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(244, 247, 251, 0.82);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  padding: 1px;
  list-style: none;
  background: var(--steel);
}

.page-about .ab-stat {
  background: var(--ink);
  padding: 12px 12px 14px;
  min-width: 0;
}

.page-about .ab-stat-num {
  display: block;
  font-size: clamp(20px, 4.4vw, 30px);
  letter-spacing: 0.05em;
  color: var(--paper);
  line-height: 1;
}

.page-about .ab-stat:first-child .ab-stat-num {
  color: var(--signal);
}

.page-about .ab-stat-cap {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.4;
  color: var(--mist);
}

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

/* ===== Section shell ===== */
.page-about .ab-section {
  padding: 48px 0;
  border-bottom: 1px solid rgba(30, 58, 99, 0.7);
}

.page-about .ab-section--blue {
  background: var(--blueprint);
}

.page-about .ab-section--last {
  border-bottom: 0;
  padding-bottom: 64px;
}

.page-about .ab-section-head {
  max-width: 720px;
  margin-bottom: 28px;
}

.page-about .ab-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .ab-kicker::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--signal);
}

.page-about .ab-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-intro {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 247, 251, 0.74);
}

.page-about .ab-sub {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .ab-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ===== 缘起 ===== */
.page-about .ab-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

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

.page-about .ab-origin-body > p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 247, 251, 0.78);
}

.page-about .ab-points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .ab-point {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-top: 1px dashed rgba(30, 58, 99, 0.95);
}

.page-about .ab-point:last-child {
  border-bottom: 1px dashed rgba(30, 58, 99, 0.95);
}

.page-about .ab-point-idx {
  padding-top: 2px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-about .ab-point-text {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 247, 251, 0.72);
}

.page-about .ab-point-text strong {
  display: block;
  margin-bottom: 3px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

/* ===== 图片 ===== */
.page-about .ab-figure {
  margin: 0;
  min-width: 0;
}

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

.page-about .ab-figure--wide {
  margin-top: 30px;
}

.page-about .ab-caption {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--mist);
}

/* ===== 时间线 ===== */
.page-about .ab-tl-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
}

.page-about .ab-tl-link {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--steel);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--paper);
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-tl-link:hover,
.page-about .ab-tl-link:focus-visible {
  border-color: var(--signal);
  color: var(--signal);
  background: rgba(255, 107, 53, 0.08);
  outline: none;
}

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

.page-about .ab-tl-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 0 0 22px 24px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: rgba(30, 58, 99, 0.95);
}

.page-about .ab-tl-item::after {
  content: "";
  position: absolute;
  left: -3px;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
}

.page-about .ab-tl-item:last-child {
  padding-bottom: 0;
}

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

.page-about .ab-tl-year {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--signal);
}

.page-about .ab-tl-card {
  min-width: 0;
  padding: 18px 18px 16px;
  background: var(--blueprint);
  border-left: 3px solid var(--signal);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .ab-tl-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .ab-tl-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 247, 251, 0.74);
}

.page-about .ab-tl-tag {
  display: inline-block;
  margin-top: 12px;
  padding: 3px 9px;
  border: 1px solid var(--steel);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--verified);
}

/* ===== 团队 ===== */
.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .ab-team-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px;
  background: var(--night);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  min-width: 0;
}

.page-about .ab-team-num {
  font-size: clamp(26px, 5vw, 34px);
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--signal);
}

.page-about .ab-team-name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .ab-team-details {
  margin-top: auto;
  border-top: 1px dashed rgba(30, 58, 99, 0.95);
  padding-top: 10px;
}

.page-about .ab-team-details summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--verified);
}

.page-about .ab-team-details summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-team-details summary::before {
  content: "+";
  font-size: 14px;
  line-height: 1;
  color: var(--verified);
}

.page-about .ab-team-details[open] summary::before {
  content: "−";
}

.page-about .ab-team-details summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

.page-about .ab-team-details p {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: rgba(244, 247, 251, 0.72);
}

/* ===== 三道工序 ===== */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .ab-flow-step {
  position: relative;
  padding: 24px 18px 18px;
  background: var(--night);
  border: 1px solid var(--steel);
  min-width: 0;
}

.page-about .ab-flow-step:nth-child(3) {
  border-color: rgba(46, 196, 182, 0.55);
}

.page-about .ab-flow-idx {
  position: absolute;
  top: -14px;
  left: 16px;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  background: var(--ink);
  border: 1px solid var(--signal);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.page-about .ab-flow-step:nth-child(3) .ab-flow-idx {
  border-color: var(--verified);
  color: var(--verified);
}

.page-about .ab-flow-title {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .ab-flow-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 247, 251, 0.74);
}

.page-about .ab-flow-foot {
  margin: 26px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--verified);
  background: rgba(46, 196, 182, 0.07);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 247, 251, 0.8);
}

/* ===== 覆盖与伙伴 ===== */
.page-about .ab-eco {
  list-style: none;
  margin: 0 0 34px;
  padding: 1px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--steel);
}

.page-about .ab-eco-item {
  background: var(--ink);
  padding: 18px 16px;
  min-width: 0;
}

.page-about .ab-eco-num {
  display: block;
  font-size: clamp(24px, 4.6vw, 34px);
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--signal);
}

.page-about .ab-eco-item:first-child .ab-eco-num {
  color: var(--paper);
}

.page-about .ab-eco-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-origin-grid--reverse {
  align-items: start;
}

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

.page-about .ab-partners li {
  padding: 13px 0;
  border-top: 1px dashed rgba(30, 58, 99, 0.95);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 247, 251, 0.74);
}

.page-about .ab-partners li strong {
  display: block;
  margin-bottom: 3px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-eco-quote {
  padding: 26px 22px;
  background: linear-gradient(160deg, rgba(255, 107, 53, 0.12), rgba(18, 43, 78, 0.6));
  border: 1px solid rgba(255, 107, 53, 0.4);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  min-width: 0;
}

.page-about .ab-quote-mark {
  margin: 0;
  font-size: 40px;
  line-height: 0.7;
  color: var(--signal);
}

.page-about .ab-quote-text {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.6vw, 24px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .ab-quote-by {
  margin: 16px 0 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* ===== 江苏 ===== */
.page-about .ab-js-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.page-about .ab-js-info {
  min-width: 0;
}

.page-about .ab-meta {
  margin: 0;
}

.page-about .ab-meta-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 12px 0;
  border-top: 1px dashed rgba(30, 58, 99, 0.95);
}

.page-about .ab-meta-row:last-child {
  border-bottom: 1px dashed rgba(30, 58, 99, 0.95);
}

.page-about .ab-meta-k {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .ab-meta-v {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .ab-addr {
  display: inline;
}

.page-about .ab-meta-v .copy-btn {
  margin-left: 8px;
  vertical-align: baseline;
}

.page-about .ab-copy-status {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--verified);
  min-height: 1em;
}

/* ===== 下一步 ===== */
.page-about .ab-next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-next-card {
  position: relative;
  display: block;
  padding: 20px 18px 18px;
  background: var(--blueprint);
  border: 1px solid var(--steel);
  text-decoration: none;
  color: inherit;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.page-about .ab-next-card:hover,
.page-about .ab-next-card:focus-visible {
  border-color: var(--signal);
  background: #16325a;
  transform: translateY(-2px);
  outline: none;
}

.page-about .ab-next-arrow {
  display: block;
  font-size: 15px;
  line-height: 1;
  color: var(--signal);
}

.page-about .ab-next-title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .ab-next-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(244, 247, 251, 0.7);
}

/* ===== 断点 ===== */
@media (min-width: 640px) {
  .page-about .ab-team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

  .page-about .ab-next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ab-stat {
    padding: 16px 16px 18px;
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero {
    padding: calc(var(--header-h) + 40px) 0 72px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .ab-rail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding-top: 6px;
  }

  .page-about .ab-rail-label {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--mist);
  }

  .page-about .ab-rail-year,
  .page-about .ab-rail-now {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.1em;
    color: var(--paper);
  }

  .page-about .ab-rail-track {
    flex: 1 1 auto;
    width: 1px;
    min-height: 150px;
    background: linear-gradient(180deg, var(--signal) 0%, var(--verified) 100%);
  }

  .page-about .ab-section {
    padding: 76px 0;
  }

  .page-about .ab-section-head {
    margin-bottom: 38px;
  }

  .page-about .ab-origin-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 46px;
  }

  .page-about .ab-origin-grid--reverse {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .ab-figure {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .ab-figure--wide {
    position: static;
    margin-top: 40px;
  }

  .page-about .ab-tl-item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 22px;
    padding: 0 0 26px 0;
  }

  .page-about .ab-tl-item::before {
    left: 60px;
    top: 10px;
    bottom: -10px;
  }

  .page-about .ab-tl-item::after {
    left: 57px;
    top: 11px;
  }

  .page-about .ab-tl-year {
    font-size: 28px;
    text-align: right;
    padding-right: 4px;
  }

  .page-about .ab-tl-item:nth-child(even) .ab-tl-card {
    margin-left: 28px;
  }

  .page-about .ab-team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

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

  .page-about .ab-js-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 46px;
  }

  .page-about .ab-meta-row {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

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

@media (min-width: 1080px) {
  .page-about .ab-hero-grid {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-tl-item {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .ab-tl-item::before {
    left: 72px;
  }

  .page-about .ab-tl-item::after {
    left: 69px;
  }

  .page-about .ab-tl-item:nth-child(even) .ab-tl-card {
    margin-left: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl-link,
  .page-about .ab-next-card {
    transition: none;
  }
}