.page-about {
  --about-soft: #3f4a55;
  --about-muted: #5a646e;
  overflow-wrap: break-word;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 22px;
}

.page-about .about-crumb nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--brown);
}

.page-about .about-crumb-sep {
  color: var(--line-strong);
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 34px 0 52px;
  background:
    radial-gradient(95% 80% at 92% -8%, rgba(30, 144, 255, .13), transparent 64%),
    linear-gradient(180deg, var(--paper) 0%, var(--mist) 100%);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 34px;
}

.page-about .about-coord {
  display: inline-block;
  margin: 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--brown);
}

.page-about .about-hero h1 {
  margin: 20px 0 0;
  font-size: clamp(34px, 7.6vw, 58px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, .74);
  box-shadow: var(--shadow-low);
}

.page-about .about-refresh {
  width: 40px;
  height: 40px;
  color: var(--mint);
  animation: aboutRefreshSpin 8s linear infinite;
}

@keyframes aboutRefreshSpin {
  to { transform: rotate(360deg); }
}

.page-about .about-anchors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-anchors li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-anchor-num {
  font-size: 40px;
  font-weight: 900;
  line-height: 1;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.page-about .about-anchor-label {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--about-muted);
}

/* ---------- 章节标题 ---------- */
.page-about .section-head {
  display: block;
}

.page-about .section-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--brick);
}

.page-about .section-head h2 {
  margin: 6px 0 0;
  max-width: 22em;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  font-weight: 900;
  color: var(--ink);
}

/* ---------- 01 栏目精简 ---------- */
.page-about .about-trim-grid {
  display: grid;
  gap: 36px;
  margin-top: 28px;
}

.page-about .about-bars {
  display: grid;
  gap: 24px;
  align-content: start;
}

.page-about .about-bar-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-bar-num {
  font-size: 44px;
  font-weight: 900;
  line-height: 1;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.page-about .about-bar-before .about-bar-num {
  color: #aeb7bf;
}

.page-about .about-bar-desc {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .03em;
  color: var(--about-muted);
}

.page-about .about-bar-rule {
  display: block;
  height: 5px;
  margin-top: 12px;
  border-radius: 3px;
  background: var(--blue-soft);
}

.page-about .about-bar-before .about-bar-rule {
  width: 100%;
  background: var(--line-strong);
}

.page-about .about-bar-after .about-bar-rule {
  width: 52%;
  background: var(--blue);
}

.page-about .about-bar-get .about-bar-rule {
  width: 20%;
  min-width: 60px;
  background: var(--mint);
}

.page-about .about-trim-copy p {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-gains {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-gains li {
  position: relative;
  padding-left: 18px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-gains li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--brick);
}

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

/* ---------- 02 栏目对照 ---------- */
.page-about .about-compare-intro {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--mist);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--about-muted);
}

.page-about .about-map {
  position: relative;
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-map-head {
  display: none;
}

.page-about .about-map-row {
  display: grid;
  gap: 6px;
  padding: 16px 14px;
  border-radius: 10px;
  transition: background-color 180ms var(--ease);
}

.page-about .about-map-row:hover,
.page-about .about-map-row:focus-within {
  background: var(--mint-soft);
}

.page-about .about-map-from {
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .about-map-to {
  font-size: 15.5px;
  line-height: 1.7;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 34px;
  margin-top: 28px;
}

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

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

.page-about .about-team-item {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-team-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .about-team-name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team-count {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--blue);
}

.page-about .about-team-desc {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 04 更新节奏 ---------- */
.page-about .about-rhythm-intro {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-track {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-node {
  position: relative;
  padding-left: 26px;
  padding-bottom: 10px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 18px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--brick);
}

.page-about .about-node::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 30px;
  bottom: 0;
  width: 1px;
  background: var(--line-strong);
}

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

.page-about .about-node-panel {
  border-bottom: 1px solid var(--line);
}

.page-about .about-node:last-child .about-node-panel {
  border-bottom: 0;
}

.page-about .about-node-panel summary {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 30px 12px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node-panel summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node-panel summary::after {
  content: "＋";
  position: absolute;
  right: 6px;
  top: 14px;
  font-size: 15px;
  line-height: 1;
  color: var(--blue);
}

.page-about .about-node-panel[open] summary::after {
  content: "－";
}

.page-about .about-node-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--brick);
}

.page-about .about-node-title {
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-node-body {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 05 服务覆盖 ---------- */
.page-about .about-cover-grid {
  display: grid;
  gap: 34px;
  margin-top: 28px;
}

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

.page-about .about-cover-copy p {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-cover-stats {
  list-style: none;
  margin: 26px 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-stat {
  display: block;
  font-size: 40px;
  font-weight: 900;
  line-height: 1;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--brown);
}

/* ---------- 06 资质 ---------- */
.page-about .about-cred-section {
  background: var(--paper);
  border-top: 1px solid var(--line);
}

.page-about .about-cred {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-cred-row {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-cred-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--brown);
}

.page-about .about-cred-val {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-cred-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-muted);
}

/* ---------- 尾屏 ---------- */
.page-about .about-cta {
  padding: 58px 0;
  background: linear-gradient(120deg, var(--green-ink) 0%, #15639b 55%, var(--blue) 100%);
  color: #fff;
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(26px, 5vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  font-weight: 900;
  color: #fff;
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .9);
}

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

.page-about .about-cta .btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, .55);
  background: rgba(255, 255, 255, .06);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-cover-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-map-head {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 0 14px 12px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .2em;
    color: var(--brown);
  }

  .page-about .about-map-row {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: baseline;
    padding: 16px 14px;
    border-top: 1px solid var(--line);
    border-radius: 0;
  }

  .page-about .about-map::after {
    content: "";
    position: absolute;
    top: 42px;
    bottom: 6px;
    left: calc(50% - 1px);
    width: 1px;
    background: var(--line-strong);
    pointer-events: none;
  }

  .page-about .about-cred-row {
    grid-template-columns: 170px minmax(0, 1fr) minmax(0, 1.2fr);
    gap: 26px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 48px 0 66px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 60px;
    align-items: end;
  }

  .page-about .about-hero-aside {
    padding: 30px 28px;
  }

  .page-about .about-trim-grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-cover-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-track {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
    margin-top: 42px;
  }

  .page-about .about-node {
    padding-left: 0;
    padding-bottom: 0;
  }

  .page-about .about-node::before {
    left: 0;
    top: 6px;
  }

  .page-about .about-node::after {
    left: 14px;
    right: -26px;
    top: 10px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .about-node-panel,
  .page-about .about-node:last-child .about-node-panel {
    border-bottom: 0;
  }

  .page-about .about-node-panel summary {
    padding: 22px 26px 14px 0;
  }

  .page-about .about-node-panel summary::after {
    top: 24px;
    right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-refresh {
    animation: none;
  }

  .page-about .about-map-row {
    transition: none;
  }
}