.page-about {
  --about-rail: 216px;
  --about-ink-soft: #3a4666;
  --about-line-light: #c7d2e6;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(90% 70% at 88% 0%, rgba(53, 230, 210, 0.18), transparent 60%),
    radial-gradient(70% 60% at 4% 98%, rgba(255, 122, 61, 0.14), transparent 62%),
    var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: radial-gradient(rgba(147, 160, 192, 0.55) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.13;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -16%;
  top: 30%;
  z-index: 0;
  width: 58%;
  height: 170%;
  transform: rotate(-12deg);
  border-left: 1px solid rgba(53, 230, 210, 0.22);
  background: linear-gradient(150deg, rgba(23, 34, 75, 0.92), rgba(14, 23, 52, 0));
  pointer-events: none;
}

.page-about .hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(56px, 8vw, 96px) var(--gutter) clamp(36px, 5.5vw, 60px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .hero-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 20ch;
  font-size: clamp(30px, 5.4vw, 56px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .hero-lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .hero-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(23, 34, 75, 0.88);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.6vw, 29px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .hero-stats li:last-child .stat-num {
  color: var(--orange);
}

.page-about .stat-label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 左窄右宽骨架 ---------- */
.page-about .about-layout {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(8px, 2vw, 24px);
}

.page-about .about-rail {
  margin-top: 26px;
}

.page-about .rail-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .rail-years {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-years li {
  flex: 0 0 auto;
}

.page-about .rail-years a {
  display: block;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .rail-years a:hover,
.page-about .rail-years a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3.2vw, 36px);
  padding: clamp(24px, 4vw, 40px) 0 clamp(44px, 7vw, 76px);
}

/* ---------- 面板 ---------- */
.page-about .band {
  position: relative;
  padding: clamp(22px, 3.4vw, 38px) clamp(18px, 3.2vw, 34px);
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .band p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-about .band--light {
  background: var(--mist);
  border-color: var(--about-line-light);
  color: var(--ink);
}

.page-about .band--light p {
  color: var(--about-ink-soft);
}

.page-about .band--light .band-title {
  color: var(--ink);
}

.page-about .band-head {
  margin-bottom: clamp(16px, 2.4vw, 24px);
  max-width: 62ch;
}

.page-about .band-title {
  margin: 0;
  font-size: clamp(21px, 2.9vw, 30px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .band-lede {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .band--light .band-lede {
  color: var(--about-ink-soft);
}

.page-about .band-note {
  margin-top: clamp(14px, 2vw, 20px);
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 环形示意 ---------- */
.page-about .ring-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  align-items: center;
  margin: clamp(16px, 2.4vw, 26px) 0;
}

.page-about .ring {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  margin: 0 auto;
}

.page-about .ring-caption {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 数值格 ---------- */
.page-about .scale-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .scale-grid--facts {
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .scale-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--panel);
}

.page-about .band--light .scale-grid {
  background: var(--about-line-light);
  border-color: var(--about-line-light);
}

.page-about .band--light .scale-item {
  background: #ffffff;
}

.page-about .scale-num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .band--light .scale-num {
  color: var(--orange-deep);
}

.page-about .scale-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .band--light .scale-label {
  color: var(--about-ink-soft);
}

/* ---------- 表格 ---------- */
.page-about .ledger-scroll {
  margin: clamp(16px, 2.4vw, 24px) 0;
  overflow-x: auto;
  border: 1px solid var(--about-line-light);
}

.page-about .ledger {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 13.5px;
}

.page-about .ledger caption {
  padding: 10px 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal);
  background: #ffffff;
}

.page-about .ledger th,
.page-about .ledger td {
  padding: 11px 12px;
  text-align: left;
  vertical-align: top;
  line-height: 1.65;
  border-top: 1px solid var(--about-line-light);
}

.page-about .ledger thead th {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--teal);
  background: #dfe7f5;
  white-space: nowrap;
}

.page-about .ledger tbody th {
  white-space: nowrap;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ledger td {
  color: var(--about-ink-soft);
}

.page-about .ledger tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.62);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(14, 23, 52, 0.6);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .band--light .about-figure {
  border-color: var(--about-line-light);
  background: #ffffff;
}

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

/* ---------- 三审步骤 ---------- */
.page-about .steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(16px, 2.4vw, 24px) 0;
}

.page-about .step {
  background: rgba(23, 34, 75, 0.92);
  border: 1px solid var(--line);
  border-top: 2px solid var(--orange);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .step summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .step-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .step-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .step-mark {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--cyan);
  transition: transform var(--t-fast) var(--ease);
}

.page-about .step[open] .step-mark {
  transform: rotate(45deg);
}

.page-about .step summary:hover .step-title,
.page-about .step summary:focus-visible .step-title {
  color: var(--cyan);
}

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

.page-about .step-body p {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .step-checks {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .step-checks li {
  position: relative;
  padding-left: 17px;
  font-size: 13px;
  line-height: 1.62;
  color: var(--muted);
}

.page-about .step-checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .team-card {
  padding: 18px;
  background: #ffffff;
  border: 1px solid var(--about-line-light);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--teal);
}

.page-about .team-role {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .team-meta {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.page-about .team-duties {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
  max-height: 340px;
  transition: max-height var(--t-slow) var(--ease), opacity var(--t-slow) var(--ease), margin-top var(--t-slow) var(--ease);
}

.page-about .team-duties li {
  position: relative;
  padding-left: 15px;
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--about-ink-soft);
}

.page-about .team-duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1.5px;
  background: var(--teal);
}

/* ---------- 里程碑 ---------- */
.page-about .milestones {
  list-style: none;
  margin: clamp(18px, 2.8vw, 28px) 0 0;
  padding: 0 0 0 22px;
  position: relative;
}

.page-about .milestones::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
}

.page-about .milestone {
  position: relative;
  padding-bottom: 24px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .milestone:last-child {
  padding-bottom: 0;
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .milestone--now::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .milestone-year {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .milestone--now .milestone-year {
  color: var(--orange);
}

.page-about .milestone h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .milestone p {
  margin: 6px 0 0;
  max-width: 60ch;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 服务承诺 ---------- */
.page-about .promise-list {
  list-style: none;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line-light);
  border: 1px solid var(--about-line-light);
}

.page-about .promise-list li {
  display: grid;
  gap: 5px;
  padding: 15px 17px;
  background: var(--paper);
}

.page-about .promise-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--orange-deep);
}

.page-about .promise-val {
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--about-ink-soft);
}

/* ---------- 收尾 ---------- */
.page-about .cta-band {
  padding: clamp(24px, 3.6vw, 38px) clamp(18px, 3.2vw, 34px);
  border: 1px solid var(--line);
  background:
    linear-gradient(118deg, rgba(255, 122, 61, 0.16), rgba(53, 230, 210, 0.12)),
    var(--panel);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .cta-band h2 {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .cta-band p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

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

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

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

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

@media (min-width: 800px) {
  .page-about .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ring-wrap {
    grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
  }

  .page-about .ring {
    margin: 0;
  }
}

/* ---------- 桌面：左侧固定刻度 ---------- */
@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    margin-top: clamp(32px, 4vw, 48px);
  }

  .page-about .rail-years {
    display: block;
    overflow: visible;
    padding: 0;
    position: relative;
  }

  .page-about .rail-years::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: var(--line);
  }

  .page-about .rail-years a {
    position: relative;
    padding: 7px 0 7px 22px;
    border: 0;
    border-radius: 0;
    font-size: 12px;
    letter-spacing: 0.08em;
  }

  .page-about .rail-years a::before {
    content: "";
    position: absolute;
    left: 0;
    top: 12px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    border: 1px solid var(--line);
    background: var(--ink);
    transition: border-color var(--t-fast) var(--ease);
  }

  .page-about .rail-years a:hover::before,
  .page-about .rail-years a:focus-visible::before {
    border-color: var(--cyan);
  }

  .page-about .about-body {
    padding-top: clamp(32px, 4vw, 48px);
  }
}

/* ---------- 触屏与低动效 ---------- */
@media (hover: hover) and (min-width: 700px) {
  .page-about .team-duties {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    overflow: hidden;
  }

  .page-about .team-card:hover .team-duties,
  .page-about .team-card:focus-within .team-duties {
    max-height: 340px;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .team-duties,
  .page-about .step-mark,
  .page-about .rail-years a,
  .page-about .rail-years a::before {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}