.page-about {
  --about-pad: clamp(56px, 8vw, 122px);
  background: var(--ink-900);
  color: var(--text-on-dark);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: flex-end;
  min-height: clamp(540px, 82vh, 820px);
  padding-top: calc(var(--header-h) + 52px);
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .5;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(130% 90% at 50% 104%, rgba(10, 24, 48, .97) 0%, rgba(10, 24, 48, .66) 44%, rgba(10, 24, 48, .22) 100%),
    linear-gradient(180deg, rgba(10, 24, 48, .88) 0%, rgba(10, 24, 48, .18) 38%, rgba(10, 24, 48, .92) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  width: 100%;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(26px, 5vw, 48px);
}

.page-about .about-hero .eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .about-hero .eyebrow::before {
  content: "";
  width: 36px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-hero h1 {
  max-width: 15ch;
  margin: 0 0 24px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 8vw, 84px);
  line-height: 1.05;
  letter-spacing: -.02em;
  overflow-wrap: break-word;
}

.page-about .about-hero h1 em {
  display: block;
  font-style: normal;
  color: var(--orange);
  transform: skewX(-2deg);
  transform-origin: left bottom;
}

.page-about .about-hero .lede {
  max-width: 640px;
  margin: 0 0 clamp(30px, 5vw, 46px);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.82;
  color: var(--paper-2);
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px clamp(24px, 5vw, 58px);
  margin: 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid rgba(216, 169, 75, .32);
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-facts .fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 30px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--mint);
}

.page-about .about-facts .fact-label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  position: relative;
  padding-block: var(--about-pad);
}

.page-about .about-chapter--paper {
  background: var(--surface-paper);
  color: var(--text-on-paper);
}

.page-about .about-chapter--ink {
  background:
    radial-gradient(circle at 6% 10%, rgba(127, 212, 216, .11), transparent 42%),
    radial-gradient(circle at 94% 86%, rgba(217, 55, 43, .12), transparent 40%),
    var(--ink-900);
  color: var(--text-on-dark);
}

.page-about .chapter-head {
  margin-bottom: clamp(24px, 4.4vw, 50px);
}

.page-about .chapter-head .section-num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .24em;
  color: var(--cyan);
}

.page-about .about-chapter--paper .chapter-head .section-num {
  color: var(--gold);
}

.page-about .chapter-head h2 {
  max-width: 22ch;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.2;
  letter-spacing: -.01em;
}

.page-about .chapter-head::after {
  content: "";
  display: block;
  height: 1px;
  margin-top: clamp(18px, 3vw, 28px);
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(127, 212, 216, 0) 72%);
}

.page-about .about-chapter--paper .chapter-head::after {
  background: linear-gradient(90deg, var(--red) 0%, rgba(217, 55, 43, 0) 72%);
}

.page-about .about-copy {
  max-width: 664px;
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
}

.page-about .about-copy + .about-copy,
.page-about .about-copy + .about-figure,
.page-about .about-figure + .about-copy {
  margin-top: clamp(22px, 3.5vw, 34px);
}

.page-about .about-copy p + p {
  margin-top: 1em;
}

.page-about .about-chapter--ink .about-copy {
  color: rgba(244, 237, 225, .82);
}

.page-about .about-copy .inline-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-copy .inline-link:hover,
.page-about .about-copy .inline-link:focus-visible {
  color: var(--orange);
}

/* ---------- 图片框 ---------- */

.page-about .about-figure {
  margin: clamp(28px, 4.5vw, 48px) 0 0;
}

.page-about .about-figure .frame {
  position: relative;
  overflow: hidden;
  clip-path: var(--cut-frame);
  background: var(--ink-800);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1400 / 600;
  object-fit: cover;
}

.page-about .about-figure--on-ink img {
  aspect-ratio: 1200 / 800;
}

.page-about .about-figure figcaption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .about-chapter--paper .about-figure figcaption {
  color: rgba(29, 23, 18, .6);
}

/* ---------- 版本时间线 ---------- */

.page-about .version-list {
  margin: clamp(28px, 4.5vw, 46px) 0 0;
  border-top: 1px solid rgba(29, 23, 18, .18);
}

.page-about .version-item {
  border-bottom: 1px solid rgba(29, 23, 18, .18);
}

.page-about .version-item summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px 16px;
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
  transition: background-color .3s var(--ease), padding-left .3s var(--ease);
}

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

.page-about .version-item summary:hover {
  background: rgba(255, 122, 26, .08);
  padding-left: 12px;
}

.page-about .version-item summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -2px;
  padding-left: 12px;
}

.page-about .version-year {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--red);
}

.page-about .version-title {
  font-family: var(--font-display);
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 700;
}

.page-about .version-toggle {
  width: 11px;
  height: 11px;
  margin-bottom: 5px;
  border-right: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
  transform: rotate(45deg);
  transition: transform .3s var(--ease), margin .3s var(--ease);
}

.page-about .version-item[open] .version-toggle {
  margin-bottom: -4px;
  transform: rotate(-135deg);
}

.page-about .version-body {
  margin: 0;
  padding: 0 4px 22px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(29, 23, 18, .78);
  animation: about-version-in .34s var(--ease);
}

@keyframes about-version-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 团队三组 ---------- */

.page-about .team-grid {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: clamp(28px, 4.5vw, 44px);
}

.page-about .team-panel {
  position: relative;
  padding: clamp(24px, 3.4vw, 34px);
  background: var(--surface-panel);
  color: var(--text-on-dark);
  clip-path: var(--cut-panel);
  transition: transform .35s var(--ease), background-color .35s var(--ease);
}

.page-about .team-panel:hover {
  transform: translateY(-6px);
  background: var(--ink-700);
}

.page-about .team-tag {
  display: inline-block;
  margin-bottom: 16px;
  padding: 4px 11px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
  border: 1px solid rgba(127, 212, 216, .5);
  border-radius: var(--radius-pill);
}

.page-about .team-panel h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.32;
  color: var(--paper);
}

.page-about .team-panel p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 237, 225, .78);
}

.page-about .team-panel ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(127, 212, 216, .22);
  padding-top: 16px;
}

.page-about .team-panel li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(244, 237, 225, .7);
}

.page-about .team-panel li::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  background: var(--orange);
  transform: rotate(45deg) translateY(-1px);
}

/* ---------- 服务区域 ---------- */

.page-about .region-layout {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .region-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(29, 23, 18, .18);
}

.page-about .region-list li {
  display: grid;
  gap: 5px;
  padding: 17px 0;
  border-bottom: 1px solid rgba(29, 23, 18, .18);
}

.page-about .region-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
}

.page-about .region-note {
  font-size: 14px;
  line-height: 1.72;
  color: rgba(29, 23, 18, .68);
}

/* ---------- 品牌主张色带 ---------- */

.page-about .about-band {
  position: relative;
  overflow: hidden;
  padding-block: clamp(64px, 11vw, 150px);
  background:
    radial-gradient(circle at 16% 30%, rgba(127, 212, 216, .17), transparent 40%),
    radial-gradient(circle at 86% 72%, rgba(255, 122, 26, .15), transparent 36%),
    var(--ink-900);
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(244, 237, 225, .16) 1px, transparent 1.4px);
  background-size: 34px 34px;
  opacity: .38;
  pointer-events: none;
}

.page-about .about-band__line {
  position: relative;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 8vw, 94px);
  line-height: 1.14;
  letter-spacing: -.03em;
  color: var(--paper);
  transform: skewX(-2deg);
  transform-origin: left center;
  overflow-wrap: break-word;
}

.page-about .about-band__line span {
  color: var(--orange);
}

/* ---------- 合作方 ---------- */

.page-about .partner-stats {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  margin: clamp(30px, 4.6vw, 50px) 0 clamp(26px, 4vw, 42px);
}

.page-about .partner-stat .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(52px, 9vw, 86px);
  line-height: .95;
  letter-spacing: -.04em;
  color: var(--red);
}

.page-about .partner-stat .stat-name {
  display: block;
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 21px);
}

.page-about .partner-stat p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(29, 23, 18, .72);
}

/* ---------- 认可 ---------- */

.page-about .honor-list {
  display: grid;
  gap: clamp(22px, 3vw, 30px);
  margin: clamp(28px, 4.4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .honor-item {
  padding-top: 22px;
  border-top: 2px solid rgba(127, 212, 216, .34);
}

.page-about .honor-item h3 {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.4vw, 23px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .honor-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(244, 237, 225, .76);
}

/* ---------- 下一步 ---------- */

.page-about .next-list {
  display: grid;
  gap: clamp(24px, 3.6vw, 38px);
  margin: clamp(28px, 4.4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .next-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: start;
  padding-bottom: clamp(20px, 3vw, 30px);
  border-bottom: 1px solid rgba(29, 23, 18, .16);
}

.page-about .next-index {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--gold);
}

.page-about .next-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.5vw, 23px);
  line-height: 1.35;
}

.page-about .next-body p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(29, 23, 18, .74);
}

/* ---------- 收束 ---------- */

.page-about .about-cta {
  margin-top: clamp(36px, 5vw, 60px);
  padding: clamp(26px, 3.6vw, 38px);
  background: var(--ink-900);
  color: var(--text-on-dark);
  clip-path: var(--cut-panel);
}

.page-about .about-cta p {
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 237, 225, .84);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .partner-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 840px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    padding-bottom: 40px;
  }

  .page-about .team-panel:nth-child(2) {
    margin-top: 40px;
  }

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

  .page-about .honor-item {
    display: flex;
    flex-direction: column;
  }
}

@media (min-width: 900px) {
  .page-about .region-layout {
    grid-template-columns: 1.12fr .88fr;
    align-items: start;
  }
}

@media (max-width: 599px) {
  .page-about .about-hero {
    min-height: auto;
    padding-top: calc(var(--header-h) + 70px);
  }

  .page-about .about-hero h1 {
    max-width: 100%;
    font-size: clamp(32px, 10vw, 44px);
  }

  .page-about .about-facts {
    gap: 16px 28px;
  }

  .page-about .version-item summary {
    grid-template-columns: auto 1fr auto;
    gap: 10px 12px;
  }

  .page-about .next-list li {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .version-body {
    animation: none;
  }

  .page-about .team-panel {
    transition: background-color .2s var(--ease);
  }

  .page-about .team-panel:hover {
    transform: none;
  }
}