.page-about {
  --about-hair: rgba(201, 162, 39, .28);
  --about-hair-soft: rgba(46, 50, 58, .9);
  --about-teal-soft: rgba(31, 111, 120, .22);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(56px, 9vw, 120px) 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(31, 111, 120, .20), transparent 62%),
    radial-gradient(80% 70% at 6% 100%, rgba(201, 162, 39, .12), transparent 60%),
    var(--bg);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(46, 50, 58, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 50, 58, .55) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .45;
  pointer-events: none;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .9), transparent 85%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
}

.page-about .about-hero-kicker {
  margin: 22px 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about .about-hero-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 76px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--fg);
  max-width: 18ch;
}

.page-about .about-hero-lede {
  max-width: 56ch;
  margin-top: 22px;
  color: var(--muted);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(34px, 5vw, 56px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fact {
  background: var(--ink-800);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-fact-num {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  color: var(--accent-soft);
  letter-spacing: -.02em;
}

.page-about .about-fact-label {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- 历程 ---------- */
.page-about .about-origin-grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
}

.page-about .about-origin-text .prose + .prose {
  margin-top: 16px;
}

.page-about .about-inline-link {
  display: inline-block;
  margin-top: 24px;
  padding-bottom: 3px;
  color: var(--accent-soft);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--gold-300);
  border-color: var(--gold-300);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-tl-node {
  position: relative;
}

.page-about .about-tl-node::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 26px;
  width: 9px;
  height: 9px;
  background: var(--bg);
  border: 2px solid var(--accent);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease);
}

.page-about .about-tl-link {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 18px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-tl-link:hover,
.page-about .about-tl-link:focus-visible {
  border-color: var(--about-hair);
  transform: translateX(4px);
}

.page-about .about-tl-node.is-current .about-tl-link {
  border-color: var(--accent-soft);
  background: linear-gradient(100deg, rgba(201, 162, 39, .14), rgba(26, 28, 33, 1) 70%);
}

.page-about .about-tl-num {
  flex: none;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 28px;
  line-height: 1;
  color: var(--accent);
  letter-spacing: -.02em;
}

.page-about .about-tl-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-tl-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
}

.page-about .about-tl-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-origin-media {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  background: var(--bg);
  border-top: 1px solid var(--line);
}

.page-about .about-teams-head .section-sub {
  max-width: 62ch;
}

.page-about .about-team-layout {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .about-team-cards {
  display: grid;
  gap: 16px;
}

.page-about .about-team-card {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: 24px 22px 26px;
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(to bottom, var(--teal-600), transparent 80%);
  opacity: .8;
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-visible,
.page-about .about-team-card:focus-within {
  border-color: var(--about-hair);
  background: var(--ink-800);
  outline: none;
}

.page-about .about-team-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--teal-ink);
}

.page-about .about-team-name {
  margin: 10px 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 22px;
  color: var(--fg);
}

.page-about .about-team-role {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--accent-soft);
}

.page-about .about-team-detail {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-team-media {
  margin: 0;
}

.page-about .about-flow {
  margin-top: clamp(34px, 5vw, 56px);
  padding: 24px 20px 18px;
  border: 1px solid var(--line);
  background: linear-gradient(120deg, rgba(31, 111, 120, .12), transparent 55%), var(--ink-800);
}

.page-about .about-flow-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-flow-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-flow-line {
  stroke: var(--line-700);
  stroke-width: 1;
  stroke-dasharray: 4 5;
}

.page-about .about-flow-dot--gold {
  fill: var(--gold-500);
}

.page-about .about-flow-dot--teal {
  fill: var(--teal-600);
}

.page-about .about-flow-label {
  font-family: var(--font-sans);
  font-size: 15px;
  fill: var(--fg);
}

.page-about .about-flow-sub {
  font-family: var(--font-sans);
  font-size: 13px;
  fill: var(--slate-400);
}

/* ---------- 流程（浅色区） ---------- */
.page-about .about-process {
  border-top: 1px solid var(--line);
}

.page-about .about-kicker-dark {
  color: var(--clay-600);
}

.page-about .about-sub-dark {
  color: #4A4F57;
  max-width: 62ch;
}

.page-about .about-steps {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  border-top: 1px solid rgba(13, 14, 17, .14);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(13, 14, 17, .14);
  align-items: start;
}

.page-about .about-step .index-num {
  font-size: clamp(30px, 4.6vw, 44px);
  color: var(--clay-600);
  line-height: 1;
}

.page-about .about-step-title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink-950);
}

.page-about .about-step-body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: #3C4149;
}

.page-about .about-process-note {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  align-items: center;
  justify-content: space-between;
  margin-top: 30px;
  padding: 22px 24px;
  background: rgba(13, 14, 17, .05);
  border-left: 3px solid var(--gold-500);
}

.page-about .about-process-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-950);
  max-width: 52ch;
}

/* ---------- 覆盖与响应 ---------- */
.page-about .about-coverage {
  background: var(--bg);
  border-top: 1px solid var(--line);
}

.page-about .about-coverage-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-service-list {
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-service-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-service-row dt {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--teal-ink);
  padding-top: 3px;
}

.page-about .about-service-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg);
}

.page-about .about-side-plate {
  position: relative;
  padding: 26px 22px;
  background: linear-gradient(150deg, rgba(201, 162, 39, .16), rgba(26, 28, 33, 1) 62%);
  border: 1px solid var(--about-hair);
}

.page-about .about-side-title {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--accent-soft);
  letter-spacing: .02em;
}

.page-about .about-side-line {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin: 0;
  padding: 12px 0;
  border-bottom: 1px solid rgba(46, 50, 58, .8);
  font-size: 14px;
}

.page-about .about-side-key {
  color: var(--muted);
  flex: none;
}

.page-about .about-side-val {
  color: var(--fg);
  text-align: right;
}

.page-about .about-side-link {
  display: inline-block;
  margin-top: 20px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--accent-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
  padding-bottom: 3px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-side-link:hover,
.page-about .about-side-link:focus-visible {
  color: var(--gold-300);
}

/* ---------- 站点主体 ---------- */
.page-about .about-subject {
  background: var(--bg);
  border-top: 1px solid var(--line);
}

.page-about .about-subject-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: center;
}

.page-about .about-subject-media {
  margin: 0;
}

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

/* ---------- 下一步 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--line);
}

.page-about .about-next-list {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-next-item {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 22px 20px;
  background: var(--ink-800);
  min-width: 0;
  transition: background var(--dur) var(--ease);
}

.page-about .about-next-item:hover {
  background: #20232A;
}

.page-about .about-next-item .index-num {
  font-size: 30px;
  line-height: 1;
  flex: none;
}

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

.page-about .about-next-title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 19px;
  color: var(--fg);
}

.page-about .about-next-body p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-next-link {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--accent-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  color: var(--gold-300);
}

.page-about .about-next-back {
  margin-top: 26px;
  font-size: 14.5px;
  color: var(--muted);
}

.page-about .about-next-back a {
  color: var(--accent-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-next-back a:hover,
.page-about .about-next-back a:focus-visible {
  color: var(--gold-300);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-about .about-origin-grid {
    grid-template-columns: 1.35fr .95fr;
    align-items: start;
  }

  .page-about .about-origin-text {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-timeline {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-origin-media {
    grid-column: 2;
    grid-row: 2;
    margin-top: 14px;
  }

  .page-about .about-team-layout {
    grid-template-columns: 1.15fr .85fr;
    align-items: start;
  }

  .page-about .about-team-cards {
    grid-template-columns: 1fr;
  }

  .page-about .about-coverage-grid {
    grid-template-columns: 1.5fr .9fr;
    align-items: start;
  }

  .page-about .about-subject-grid {
    grid-template-columns: 1.1fr .9fr;
  }

  .page-about .about-subject-media {
    order: 2;
  }

  .page-about .about-subject-text {
    order: 1;
  }
}

@media (min-width: 1100px) {
  .page-about .about-origin-grid {
    grid-template-columns: 1.25fr 1fr 260px;
  }

  .page-about .about-timeline {
    grid-column: 2;
  }

  .page-about .about-origin-media {
    grid-column: 3;
    grid-row: 1 / span 2;
    margin-top: 0;
    align-self: stretch;
  }

  .page-about .about-origin-media img {
    height: 100%;
    object-fit: cover;
  }
}

/* ---------- 无障碍与动效 ---------- */
.page-about .copy-btn {
  cursor: pointer;
}

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

  .page-about .about-tl-link:hover,
  .page-about .about-tl-link:focus-visible {
    transform: none;
  }
}
</main>