.page-about {
  --about-pad: clamp(56px, 9vw, 108px);
  --about-gap: clamp(24px, 4vw, 40px);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(30px, 7vw, 62px)) 0 clamp(46px, 8vw, 82px);
  background: linear-gradient(163deg, var(--ink-deep) 0%, var(--ink) 56%, #122338 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(72vw, 760px);
  height: 148%;
  z-index: -1;
  background: linear-gradient(190deg, rgba(168, 203, 224, 0.17), rgba(168, 203, 224, 0));
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  transform: rotate(7deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -14%;
  bottom: -34%;
  width: min(66vw, 580px);
  aspect-ratio: 1 / 1;
  z-index: -1;
  background: radial-gradient(circle at 50% 50%, rgba(41, 211, 162, 0.22), rgba(41, 211, 162, 0) 64%);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumb {
  color: var(--snow);
}

.page-about .about-eyebrow {
  margin-top: clamp(20px, 4vw, 34px);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--clay-soft);
}

.page-about h1 {
  margin-top: 14px;
  max-width: 22ch;
  font-size: clamp(32px, 6.6vw, 58px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-lede {
  margin-top: clamp(18px, 3vw, 26px);
  max-width: 44em;
  font-size: clamp(15px, 3.6vw, 17px);
  color: var(--snow);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero-stats li {
  display: grid;
  gap: 2px;
  padding: 14px 16px;
  border: 1px solid var(--line-dark);
  border-radius: var(--r-md);
  background: rgba(22, 38, 61, 0.72);
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--signal);
}

.page-about .about-stat-label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--snow);
}

/* ---------- 章节底板 ---------- */
.page-about .about-band {
  position: relative;
  padding: var(--about-pad) 0;
  border-top: 2px solid var(--line-dark);
  background: var(--ink);
}

.page-about .about-band--light {
  background: var(--mist);
  color: var(--ink);
  border-top-color: rgba(14, 26, 43, 0.14);
}

.page-about .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: end;
  gap: 14px;
  margin-bottom: var(--about-gap);
}

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

.page-about .about-sub {
  max-width: 42em;
  margin-top: -8px;
  font-size: 16px;
  color: var(--snow);
}

.page-about .about-band--light .about-sub {
  color: #3B4E66;
}

.page-about .about-intro p {
  max-width: 42em;
  font-size: 16px;
  color: var(--snow);
}

.page-about .about-intro p + p {
  margin-top: 16px;
}

/* ---------- 01 两条入口 ---------- */
.page-about .about-doors {
  display: grid;
  gap: 14px;
  margin-top: var(--about-gap);
}

.page-about .about-door {
  display: grid;
  gap: 10px;
  padding: 24px 22px;
  border: 1px solid var(--line-dark);
  border-radius: var(--r-lg);
  background: var(--panel);
  color: var(--white);
  text-decoration: none;
  transition: transform 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-door:hover,
.page-about .about-door:focus-visible {
  transform: translateY(-3px);
  border-color: var(--signal);
  background: var(--panel-lift);
}

.page-about .about-door-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--clay-soft);
}

.page-about .about-door h3 {
  font-size: 20px;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.page-about .about-door p {
  font-size: 15px;
  color: var(--snow);
}

.page-about .about-door-more {
  font-size: 14px;
  font-weight: 700;
  color: var(--signal);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0 0 var(--about-gap);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
  object-fit: cover;
  background: var(--panel);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .about-band--light .about-figure figcaption {
  color: #5C6E82;
}

/* ---------- 02 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: var(--about-gap);
}

.page-about .about-team-card {
  display: grid;
  gap: 8px;
  padding: 22px 20px;
  border: 1px solid var(--line-light);
  border-radius: var(--r-lg);
  background: var(--white);
}

.page-about .about-team-tag {
  justify-self: start;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  background: rgba(217, 118, 74, 0.16);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: #A8542C;
}

.page-about .about-team-card h3 {
  font-size: 18px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-team-card p {
  font-size: 15px;
  color: #3B4E66;
}

/* ---------- 03 流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: flow;
}

.page-about .about-flow li {
  position: relative;
  padding: 20px 20px 20px 66px;
  border: 1px solid var(--line-dark);
  border-radius: var(--r-md);
  background: var(--panel);
}

.page-about .about-flow li::before {
  counter-increment: flow;
  content: "0" counter(flow);
  position: absolute;
  left: 20px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--clay);
}

.page-about .about-flow h3 {
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-flow p {
  margin-top: 6px;
  font-size: 15px;
  color: var(--snow);
}

/* ---------- 04 覆盖范围 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-coverage-main > p {
  max-width: 42em;
  margin-bottom: 20px;
  font-size: 16px;
  color: #3B4E66;
}

.page-about .about-cover-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 var(--about-gap);
  padding: 0;
  list-style: none;
}

.page-about .cover-cell {
  display: grid;
  gap: 3px;
  padding: 12px 13px 14px;
  border: 1px solid var(--line-light);
  border-radius: var(--r-md);
  background: var(--white);
  transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .cover-cell:hover {
  transform: translateY(-2px);
  border-color: var(--signal-deep);
}

.page-about .cover-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .cover-count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--slate);
}

.page-about .cover-count b {
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--signal-deep);
}

.page-about .cover-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: #A8542C;
  opacity: 0;
  transition: opacity 140ms var(--ease);
}

.page-about .cover-cell:hover .cover-hint {
  opacity: 1;
}

.page-about .about-partners {
  padding: 22px 20px;
  border: 1px solid var(--line-light);
  border-left: 4px solid var(--clay);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.7);
}

.page-about .about-partners h3 {
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-partners p {
  margin-top: 8px;
  max-width: 40em;
  font-size: 15px;
  color: #3B4E66;
}

.page-about .about-partner-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partner-tags li {
  padding: 5px 13px;
  border: 1px solid var(--line-light);
  border-radius: var(--r-pill);
  background: var(--white);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: #3B4E66;
}

/* ---------- 05 更新节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  gap: 14px;
  margin-top: var(--about-gap);
}

.page-about .about-cadence-card {
  display: grid;
  gap: 6px;
  padding: 22px 20px;
  border: 1px solid var(--line-dark);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, var(--panel-lift) 0%, var(--panel) 100%);
}

.page-about .about-cadence-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 5vw, 27px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--signal);
}

.page-about .about-cadence-card h3 {
  font-size: 16px;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-cadence-card p {
  font-size: 15px;
  color: var(--snow);
}

/* ---------- 06 版本时间轴 ---------- */
.page-about .about-versions {
  display: grid;
  gap: 16px;
  margin-top: var(--about-gap);
}

.page-about .about-version {
  position: relative;
  border: 1px solid var(--line-light);
  border-radius: var(--r-lg);
  background: var(--white);
  overflow: hidden;
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-version:hover {
  border-color: var(--clay-soft);
}

.page-about .about-version[open] {
  border-color: var(--clay);
}

.page-about .about-version > summary {
  display: grid;
  gap: 4px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-version-code {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--clay);
}

.page-about .about-version-name {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-version-body {
  padding: 0 22px 22px;
  border-top: 1px solid var(--line-light);
  padding-top: 14px;
  font-size: 15px;
  color: #3B4E66;
}

.page-about .about-figure--narrow {
  margin: var(--about-gap) 0 0;
}

/* ---------- 07 联系 ---------- */
.page-about .about-contact {
  background: linear-gradient(140deg, #12243A 0%, var(--ink) 64%, #10293B 100%);
  border-top-color: var(--line-dark);
}

.page-about .about-contact-inner p {
  max-width: 42em;
  font-size: 16px;
  color: var(--snow);
}

.page-about .about-contact-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: var(--about-gap);
}

.page-about .about-copy {
  padding: 11px 20px;
  border: 1px solid var(--signal);
  border-radius: var(--r-pill);
  background: rgba(41, 211, 162, 0.1);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 160ms var(--ease), border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-copy:hover,
.page-about .about-copy:focus-visible {
  background: rgba(41, 211, 162, 0.22);
  border-color: var(--white);
  color: var(--white);
}

.page-about .about-copy[data-copied="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
}

.page-about .about-contact-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--slate);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 960px) {
  .page-about h1 {
    max-width: 20ch;
  }

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

  .page-about .about-team-card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-team-card:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-figure--side {
    margin-bottom: 0;
  }

  .page-about .about-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    padding-top: 30px;
    position: relative;
  }

  .page-about .about-versions::before {
    content: "";
    position: absolute;
    top: 12px;
    left: 0;
    right: 0;
    height: 2px;
    border-radius: var(--r-pill);
    background: linear-gradient(90deg, var(--clay) 0%, rgba(41, 211, 162, 0.9) 100%);
  }

  .page-about .about-version::before {
    content: "";
    position: absolute;
    top: -23px;
    left: 26px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--clay);
    box-shadow: 0 0 0 4px var(--mist);
  }

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

@media (min-width: 1120px) {
  .page-about .about-cover-grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

  .page-about .about-team-card:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .about-team-card:nth-child(3) {
    margin-top: 68px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-door,
  .page-about .cover-cell,
  .page-about .about-version,
  .page-about .about-copy,
  .page-about .cover-hint {
    transition: none;
  }

  .page-about .about-door:hover,
  .page-about .cover-cell:hover {
    transform: none;
  }
}