.page-about {
  --about-rail: 168px;
  --about-line: 1px solid rgba(200, 166, 90, 0.28);
  --about-dash: 1px dashed rgba(200, 166, 90, 0.22);
  background: var(--ink);
  color: var(--paper);
  line-height: 1.75;
}

.page-about .visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-about h2 {
  font-family: var(--ff-head);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}

.page-about h2::after {
  content: "";
  display: block;
  width: 76px;
  height: 2px;
  margin-top: 14px;
  background: var(--gold-line);
}

.page-about h3 {
  font-family: var(--ff-head);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .prose {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 17px;
  color: rgba(245, 241, 232, 0.84);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 5vw, 54px) 0 clamp(18px, 3vw, 30px);
}

.page-about .crumb {
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .crumb a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .crumb a:hover,
.page-about .crumb a:focus-visible {
  color: var(--gold-hi);
}

.page-about .crumb-sep {
  margin: 0 8px;
  color: rgba(200, 166, 90, 0.6);
}

.page-about .crumb [aria-current="page"] {
  color: var(--gold-hi);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
  margin-top: clamp(16px, 3vw, 28px);
}

.page-about .about-hero-copy .kicker {
  margin: 0 0 12px;
}

.page-about .about-hero h1 {
  font-family: var(--ff-head);
  font-weight: 900;
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0;
}

.page-about .h1-accent {
  display: block;
  color: var(--gold);
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 30em;
  font-size: clamp(16px, 2.2vw, 18px);
  color: rgba(245, 241, 232, 0.8);
}

.page-about .status-slab {
  border: var(--about-line);
  background: var(--ink-2);
  padding: 16px 20px 18px;
  box-shadow: var(--shadow-1);
}

.page-about .status-title {
  margin: 0 0 10px;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .status-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 0;
  border-bottom: var(--about-dash);
}

.page-about .status-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .status-key {
  font-family: var(--ff-mono);
  font-size: 12px;
  color: var(--mist);
  flex: 0 0 auto;
}

.page-about .status-val {
  font-family: var(--ff-mono);
  font-size: 13px;
  color: var(--gold-hi);
  text-align: right;
}

.page-about .about-plate {
  position: relative;
  margin: clamp(22px, 4vw, 38px) 0 0;
  border: var(--about-line);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-about .about-plate::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold-line);
  z-index: 2;
}

.page-about .about-plate img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

/* ---------- 章节索引条 ---------- */
.page-about .about-nav {
  position: sticky;
  top: var(--hdr-h);
  z-index: 6;
  background: rgba(10, 22, 20, 0.95);
  border-top: 1px solid rgba(200, 166, 90, 0.32);
  border-bottom: 1px solid rgba(200, 166, 90, 0.32);
}

.page-about .about-nav-inner {
  display: flex;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-nav-inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-nav a {
  flex: 0 0 auto;
  padding: 12px 16px;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  text-decoration: none;
  border-right: 1px solid rgba(200, 166, 90, 0.16);
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .about-nav a:hover,
.page-about .about-nav a:focus-visible {
  color: var(--gold-hi);
  background: rgba(200, 166, 90, 0.07);
}

.page-about .about-nav a[aria-current="true"] {
  color: var(--ink-3);
  background: var(--gold);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-sec {
  padding: clamp(30px, 5vw, 66px) 0;
  border-top: var(--about-dash);
}

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

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .coord-num {
  font-family: var(--ff-mono);
  font-weight: 500;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .coord-label {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

/* ---------- 参数表 ---------- */
.page-about .table-scroll {
  margin-top: 26px;
  border: var(--about-line);
  overflow-x: auto;
}

.page-about .spec-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  background: var(--paper);
  color: var(--ink);
  font-size: 15px;
}

.page-about .spec-table th,
.page-about .spec-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
}

.page-about .spec-table thead th {
  background: var(--gold);
  color: var(--ink-3);
  font-family: var(--ff-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.page-about .spec-table tbody tr + tr td {
  border-top: 1px solid rgba(14, 42, 37, 0.16);
}

.page-about .spec-table td:first-child {
  font-family: var(--ff-mono);
  font-size: 13px;
  color: var(--bronze);
  white-space: nowrap;
}

.page-about .spec-table td:last-child {
  font-weight: 500;
}

/* ---------- 团队分工 ---------- */
.page-about .crew {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .crew-card {
  position: relative;
  border: var(--about-line);
  background: var(--ink-2);
  padding: 22px 20px 20px;
  box-shadow: var(--shadow-1);
  transition: transform var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease);
}

.page-about .crew-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold-line);
}

.page-about .crew-card:hover {
  transform: translateY(-4px);
  border-color: rgba(232, 212, 154, 0.6);
}

.page-about .crew-name {
  margin: 0;
  font-size: 21px;
}

.page-about .crew-role {
  margin: 4px 0 12px;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .crew-card p:last-child {
  margin: 0;
  font-size: 15px;
  color: rgba(245, 241, 232, 0.8);
}

.page-about .about-media {
  margin: 26px 0 0;
  border: var(--about-line);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

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

/* ---------- 批次与阶段 ---------- */
.page-about .batch-index {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  padding: 0;
  margin: 24px 0 8px;
}

.page-about .batch-index a {
  display: inline-block;
  padding: 6px 11px;
  border: 1px solid rgba(200, 166, 90, 0.45);
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold-hi);
  text-decoration: none;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .batch-index a:hover,
.page-about .batch-index a:focus-visible {
  background: var(--gold);
  color: var(--ink-3);
}

.page-about .phase-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 34px 0 4px;
}

.page-about .phase-num {
  flex: 0 0 auto;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--bronze);
}

.page-about .phase-head h3 {
  margin: 0;
  flex: 0 0 auto;
  font-size: clamp(17px, 2.4vw, 21px);
}

.page-about .phase-rule {
  flex: 1 1 auto;
  height: 1px;
  min-width: 20px;
  background: linear-gradient(90deg, rgba(169, 116, 63, 0.85), rgba(169, 116, 63, 0));
}

.page-about .batches {
  margin-top: 8px;
  padding-left: 18px;
  border-left: 1px solid rgba(169, 116, 63, 0.55);
}

.page-about .batch {
  padding: 18px 0;
  border-bottom: var(--about-dash);
  scroll-margin-top: calc(var(--hdr-h) + 62px);
}

.page-about .batch:last-child {
  border-bottom: 0;
  padding-bottom: 4px;
}

.page-about .batch:target {
  background: rgba(200, 166, 90, 0.07);
  box-shadow: -18px 0 0 rgba(200, 166, 90, 0.07);
}

.page-about .batch-coord {
  font-family: var(--ff-mono);
  font-weight: 500;
  font-size: clamp(16px, 2.4vw, 20px);
  color: var(--gold);
}

.page-about .batch h3 {
  margin: 6px 0 10px;
  font-size: clamp(17px, 2.3vw, 20px);
}

.page-about .batch-log {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.page-about .batch-log li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 15px;
  color: rgba(245, 241, 232, 0.82);
}

.page-about .tag {
  flex: 0 0 auto;
  padding: 0 6px;
  border: 1px solid rgba(200, 166, 90, 0.5);
  font-family: var(--ff-mono);
  font-size: 10px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--gold-hi);
}

/* ---------- 维护节奏 ---------- */
.page-about .cadence {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .cadence-item {
  border-top: 2px solid rgba(169, 116, 63, 0.75);
  padding-top: 14px;
}

.page-about .cadence-key {
  margin: 0 0 8px;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .cadence-item p:last-child {
  margin: 0;
  font-size: 15px;
  color: rgba(245, 241, 232, 0.8);
}

.page-about .tick-line {
  height: 14px;
  margin: 30px 0 0;
  border-bottom: 1px solid rgba(169, 116, 63, 0.7);
  background-image: repeating-linear-gradient(90deg, rgba(169, 116, 63, 0.85) 0 1px, transparent 1px 40px);
}

/* ---------- 服务响应 ---------- */
.page-about .support-grid {
  display: grid;
  gap: 24px;
  margin-top: 20px;
}

.page-about .support-grid .prose {
  margin-top: 0;
}

.page-about .support-grid .prose + .prose {
  margin-top: 14px;
  font-size: 15px;
  color: rgba(245, 241, 232, 0.72);
}

.page-about .contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border: var(--about-line);
  background: var(--ink-2);
}

.page-about .contact-list li {
  display: grid;
  gap: 4px;
  padding: 14px 18px;
  border-bottom: var(--about-dash);
}

.page-about .contact-list li:last-child {
  border-bottom: 0;
}

.page-about .contact-key {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .contact-val {
  font-size: 15px;
  color: var(--paper);
  word-break: break-word;
}

/* ---------- 持续改进 ---------- */
.page-about .next-list {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .next-item {
  border: var(--about-line);
  padding: 20px 18px;
  background: linear-gradient(180deg, rgba(200, 166, 90, 0.08), rgba(200, 166, 90, 0) 62%);
}

.page-about .next-num {
  display: block;
  font-family: var(--ff-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--gold);
}

.page-about .next-item h3 {
  margin: 12px 0 8px;
  font-size: 19px;
}

.page-about .next-item p {
  margin: 0;
  font-size: 15px;
  color: rgba(245, 241, 232, 0.8);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  padding: clamp(34px, 5vw, 68px) 0 clamp(44px, 7vw, 84px);
  background: var(--ink-2);
  border-top: 1px solid rgba(200, 166, 90, 0.42);
}

.page-about .about-cta h2 {
  margin: 0;
}

.page-about .about-cta-text {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 16px;
  color: rgba(245, 241, 232, 0.82);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .batch {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 16px;
  }

  .page-about .batch h3 {
    margin-top: 0;
  }
}

@media (min-width: 760px) {
  .page-about .crew,
  .page-about .cadence,
  .page-about .next-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }

  .page-about .about-sec-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 60px);
  }

  .page-about .about-rail {
    display: block;
    text-align: right;
    padding-right: 16px;
    border-right: var(--about-line);
  }

  .page-about .coord-num {
    display: block;
  }

  .page-about .coord-label {
    display: block;
    margin-top: 8px;
    letter-spacing: 0.16em;
  }

  .page-about .support-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(24px, 4vw, 48px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-nav a {
    padding: 13px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-card {
    transition: none;
  }

  .page-about .crew-card:hover {
    transform: none;
  }
}