.page-about {
  --about-hairline: rgba(201, 162, 74, 0.3);
  --about-panel: #131D3A;
  --about-panel-deep: #1B2749;
  --about-line: #2E3E6B;
  --about-tl-pad: clamp(26px, 3vw, 44px);
  background: var(--ink-900);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(40px, 7vw, 104px)) 0 clamp(56px, 8vw, 116px);
  background: var(--ink-900);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 38%;
  filter: saturate(0.45) contrast(1.06) brightness(0.78);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(11, 18, 38, 0.62) 0%, rgba(11, 18, 38, 0.88) 54%, var(--ink-900) 100%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero-kicker {
  margin: clamp(26px, 4vw, 52px) 0 14px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .about-hero-title {
  margin: 0;
  color: var(--porcelain);
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.015em;
  line-height: 1.02;
  font-size: clamp(52px, 9vw, 120px);
}

.page-about .about-hero-lede {
  max-width: 62ch;
  margin: clamp(20px, 2.6vw, 34px) 0 0;
  color: var(--porcelain-dim);
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.85;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(24px, 3.2vw, 40px);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(40px, 6vw, 76px) 0 0;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.2vw, 24px);
  margin: 0;
  background: rgba(19, 29, 58, 0.78);
  backdrop-filter: blur(6px);
}

.page-about .about-fact-key {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--porcelain-dim);
}

.page-about .about-fact-val {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1;
  color: var(--gold-soft);
}

/* ---------- 通用节头 ---------- */

.page-about .about-head {
  max-width: 760px;
}

.page-about .about-head .section-lead {
  margin-top: 14px;
}

/* ---------- 岗位 ---------- */

.page-about .duty-grid {
  margin-top: clamp(34px, 4.6vw, 60px);
  gap: clamp(16px, 2.2vw, 26px);
}

.page-about .duty-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 2.8vw, 36px);
  background: var(--about-panel);
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--gold);
  border-radius: 2px;
}

.page-about .duty-card .placard-index {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .duty-card .placard-title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.3;
  color: var(--porcelain);
}

.page-about .duty-card .placard-text {
  margin: 0;
  color: var(--porcelain-dim);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .duty-card .placard-meta {
  margin: 4px 0 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-600);
  color: #8C97B8;
}

/* ---------- 流程 ---------- */

.page-about .process-layout {
  margin-top: clamp(32px, 4.4vw, 56px);
  gap: clamp(26px, 3.6vw, 52px);
  align-items: start;
}

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

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

.page-about .process-details {
  position: relative;
}

.page-about .process-summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 1.6vw, 22px);
  padding: clamp(18px, 2.2vw, 26px) 4px;
  cursor: pointer;
  list-style: none;
  transition: background 160ms var(--ease);
}

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

.page-about .process-summary:hover .process-title {
  color: var(--gold-soft);
}

.page-about .process-summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .process-index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .process-title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.4;
  color: var(--porcelain);
  transition: color 160ms var(--ease);
}

.page-about .process-mark {
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--gold);
  border-bottom: 1.5px solid var(--gold);
  transform: rotate(45deg);
  transition: transform 200ms var(--ease);
}

.page-about .process-details[open] .process-mark {
  transform: rotate(-135deg);
}

.page-about .process-body {
  padding: 0 4px clamp(20px, 2.4vw, 28px);
}

.page-about .process-body p {
  margin: 0;
  max-width: 64ch;
  color: var(--porcelain-dim);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .process-aside {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2vw, 24px);
}

.page-about .process-figure {
  margin: 0;
  border: 1px solid var(--about-line);
}

.page-about .process-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.55) contrast(1.05);
}

.page-about .process-note {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--cinnabar);
  color: var(--porcelain-dim);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .process-link {
  align-self: flex-start;
}

/* ---------- 历程 ---------- */

.page-about .timeline-figure {
  margin: clamp(34px, 4.4vw, 56px) 0 0;
  border: 1px solid var(--about-line);
}

.page-about .timeline-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.5) contrast(1.05);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(46px, 6vw, 78px) 0 0;
  padding: 0 0 0 var(--about-tl-pad);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-line) 0%, var(--gold) 62%, var(--about-line) 100%);
}

.page-about .timeline-item {
  position: relative;
}

.page-about .timeline-item + .timeline-item {
  margin-top: clamp(26px, 3.4vw, 46px);
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-tl-pad) - 5px);
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--gold);
  box-sizing: border-box;
}

.page-about .timeline-item:last-child::before {
  background: var(--gold);
}

.page-about .timeline-year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.4vw, 28px);
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--gold);
}

.page-about .timeline-body {
  margin-top: 10px;
  max-width: 68ch;
}

.page-about .timeline-title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.4;
  color: var(--porcelain);
}

.page-about .timeline-text {
  margin: 0;
  color: var(--porcelain-dim);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 规模 ---------- */

.page-about .stat-board {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1px;
  margin-top: clamp(32px, 4.4vw, 56px);
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .stat-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(24px, 3vw, 40px);
  background: var(--ink-900);
}

.page-about .stat-cell:nth-child(odd) {
  background: var(--about-panel-deep);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 4.6vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--porcelain);
}

.page-about .stat-cell:first-child .stat-num,
.page-about .stat-cell:last-child .stat-num {
  color: var(--gold-soft);
}

.page-about .stat-label {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 15px;
  color: var(--porcelain);
}

.page-about .stat-note {
  color: var(--porcelain-dim);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 坚持 ---------- */

.page-about .ways-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(24px, 3.4vw, 44px);
  margin-top: clamp(34px, 4.4vw, 58px);
}

.page-about .way-item {
  padding-top: 20px;
  border-top: 2px solid var(--gold);
}

.page-about .way-index {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .way-title {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(19px, 1.9vw, 24px);
  line-height: 1.35;
  color: var(--porcelain);
}

.page-about .way-text {
  margin: 0;
  color: var(--porcelain-dim);
  font-size: 16px;
  line-height: 1.82;
}

/* ---------- 结尾指引 ---------- */

.page-about .about-cta {
  margin-top: clamp(56px, 8vw, 110px);
  padding: clamp(52px, 7vw, 104px) 0;
  background:
    radial-gradient(120% 140% at 12% 0%, rgba(201, 162, 74, 0.14) 0%, rgba(11, 18, 38, 0) 58%),
    var(--ink-800);
  border-top: 1px solid var(--about-line);
}

.page-about .about-cta-inner {
  max-width: 820px;
}

.page-about .about-cta-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4.4vw, 54px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--porcelain);
}

.page-about .about-cta-text {
  margin: clamp(16px, 2vw, 24px) 0 0;
  max-width: 60ch;
  color: var(--porcelain-dim);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
  margin-top: clamp(26px, 3.4vw, 42px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .timeline-item {
    display: grid;
    grid-template-columns: minmax(0, 160px) minmax(0, 1fr);
    gap: clamp(18px, 2.6vw, 36px);
    align-items: start;
  }

  .page-about .timeline-body {
    margin-top: 0;
  }

  .page-about .timeline-item::before {
    top: 6px;
  }
}

@media (max-width: 899px) {
  .page-about .duty-card,
  .page-about .process-main,
  .page-about .process-aside {
    grid-column: 1 / -1;
  }

  .page-about .process-aside {
    margin-top: clamp(20px, 4vw, 32px);
  }
}

@media (max-width: 520px) {
  .page-about .about-hero-actions .btn,
  .page-about .about-cta-actions .btn {
    width: 100%;
    text-align: center;
  }

  .page-about .about-cta-actions {
    gap: 14px;
  }

  .page-about .timeline-year {
    font-size: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .process-mark,
  .page-about .process-title,
  .page-about .process-summary {
    transition: none;
  }
}