.page-about {
  --about-rail-w: 118px;
  --about-line: rgba(0, 229, 201, .32);
  --about-card: rgba(27, 58, 107, .55);
  background: var(--ink);
  color: var(--white);
  overflow-x: hidden;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: clamp(22px, 5vw, 38px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--fog);
}

.page-about .breadcrumb-list a {
  color: var(--cyan-mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 201, .35);
  padding-bottom: 2px;
}

.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(124, 144, 181, .6);
}

.page-about .breadcrumb-current {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 48px) 0 clamp(54px, 9vw, 108px);
  background:
    radial-gradient(110% 90% at 84% -12%, rgba(0, 229, 201, .20), transparent 58%),
    radial-gradient(80% 70% at 4% 112%, rgba(255, 107, 53, .16), transparent 62%),
    linear-gradient(180deg, var(--night) 0%, var(--ink) 84%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -12% -46% 38%;
  height: 78%;
  background: repeating-linear-gradient(
    115deg,
    rgba(0, 229, 201, .09) 0 1px,
    transparent 1px 28px
  );
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(24px, 5vw, 40px);
}

.page-about .about-hero-rail {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero-copy .eyebrow {
  display: block;
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--cyan-mist);
}

.page-about .about-hero-title {
  margin: 0 0 clamp(18px, 3vw, 28px);
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 80px);
  line-height: 1.04;
  letter-spacing: -.025em;
  color: var(--white);
}

.page-about .about-hero-lede {
  max-width: 46ch;
  margin: 0;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.8;
  color: rgba(247, 250, 255, .82);
}

.page-about .about-hero-stats {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 18px;
  border-radius: var(--radius-pill);
  background: var(--about-card);
  border: 1px solid rgba(0, 229, 201, .22);
}

.page-about .about-stat-num {
  flex: none;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-stat-label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(247, 250, 255, .74);
}

/* ---------- 章节通用 ---------- */
.page-about .chapter {
  position: relative;
  padding: clamp(56px, 10vw, 118px) 0;
}

.page-about .chapter--ink {
  background: var(--ink);
  color: var(--white);
}

.page-about .chapter--night {
  background: linear-gradient(180deg, var(--night) 0%, #08163a 100%);
  color: var(--white);
}

.page-about .chapter--paper {
  background: var(--paper);
  color: var(--paper-ink);
}

.page-about .chapter--ink + .chapter--night,
.page-about .chapter--night + .chapter--paper,
.page-about .chapter--paper + .chapter--ink {
  position: relative;
}

.page-about .chapter--paper {
  border-top: 1px solid rgba(0, 229, 201, .30);
  border-bottom: 1px solid rgba(0, 229, 201, .30);
}

.page-about .chapter-inner {
  display: grid;
  gap: clamp(24px, 4vw, 34px);
}

.page-about .chapter-rail {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 10px;
  border-top: 2px solid var(--cyan);
}

.page-about .chapter-index {
  font-size: clamp(32px, 6vw, 52px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .chapter-rail-text {
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--fog);
}

.page-about .chapter--paper .chapter-rail {
  border-top-color: var(--orange);
}

.page-about .chapter--paper .chapter-index {
  color: var(--paper-ink);
}

.page-about .chapter--paper .chapter-rail-text {
  color: rgba(20, 33, 61, .55);
}

.page-about .section-title {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-size: clamp(26px, 4.6vw, 42px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .chapter--paper .section-title {
  color: var(--paper-ink);
}

.page-about .lede {
  max-width: 62ch;
  margin: 0 0 clamp(22px, 3.6vw, 34px);
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.8;
  color: rgba(247, 250, 255, .78);
}

.page-about .chapter--paper .lede {
  color: rgba(20, 33, 61, .76);
}

.page-about .media-caption {
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--fog);
}

.page-about .chapter--paper .media-caption {
  color: rgba(20, 33, 61, .58);
}

.page-about figcaption.media-caption {
  display: block;
}

/* ---------- 01 起点 ---------- */
.page-about .chapter-cols {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .prose {
  color: rgba(247, 250, 255, .8);
}

.page-about .prose p {
  margin: 0 0 1.1em;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.85;
}

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

.page-about .chapter-note {
  align-self: start;
  padding: 24px 26px;
  border-radius: var(--radius-card);
  border: 1px solid rgba(0, 229, 201, .3);
  background: linear-gradient(150deg, rgba(0, 229, 201, .12), rgba(27, 58, 107, .22));
}

.page-about .chapter-note-label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan-mist);
}

.page-about .chapter-note-value {
  margin: 0 0 8px;
  font-size: clamp(32px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .chapter-note-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(247, 250, 255, .72);
}

/* ---------- 02 团队 ---------- */
.page-about .team-figure {
  margin: 0 0 clamp(26px, 4vw, 40px);
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid rgba(0, 229, 201, .22);
}

.page-about .team-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .team-figure .media-caption {
  padding: 0 20px 16px;
  margin-top: 14px;
}

.page-about .team-cards {
  display: grid;
  gap: 18px;
}

.page-about .team-card {
  padding: 26px 24px 22px;
  border-radius: var(--radius-card);
  background: var(--about-card);
  border: 1px solid rgba(0, 229, 201, .18);
  transition: transform .26s var(--ease-out), border-color .26s var(--ease-out);
}

.page-about .team-card:focus-within,
.page-about .team-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 229, 201, .55);
}

.page-about .team-card-tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--night);
  background: var(--cyan);
}

.page-about .team-card .card-title {
  margin: 0 0 12px;
  font-size: clamp(19px, 2.6vw, 23px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--white);
}

.page-about .team-card .card-text {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(247, 250, 255, .78);
}

.page-about .team-card-meta {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid rgba(0, 229, 201, .2);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

/* ---------- 03 覆盖 ---------- */
.page-about .coverage-layout {
  display: grid;
  gap: clamp(22px, 3.6vw, 34px);
  margin-bottom: clamp(22px, 3.4vw, 30px);
}

.page-about .coverage-figure {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--paper-shade);
  background: #ece4d6;
}

.page-about .coverage-figure img {
  width: 100%;
  object-fit: cover;
}

.page-about .coverage-figure .media-caption {
  padding: 0 20px 16px;
  margin-top: 14px;
}

.page-about .coverage-stats {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  align-content: start;
}

.page-about .coverage-stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .55);
  border-left: 3px solid var(--orange);
}

.page-about .coverage-num {
  flex: none;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--paper-ink);
}

.page-about .coverage-label {
  font-size: 13.5px;
  line-height: 1.55;
  color: rgba(20, 33, 61, .78);
}

.page-about .coverage-note {
  max-width: 68ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(20, 33, 61, .78);
}

/* ---------- 04 演进 ---------- */
.page-about .version-timeline {
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  margin: 0 0 clamp(30px, 5vw, 48px);
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .version-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(0, 229, 201, .55) 55%, rgba(0, 229, 201, .08) 100%);
}

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

.page-about .version-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--cyan);
}

.page-about .version-no {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--orange);
}

.page-about .version-title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .version-text {
  max-width: 64ch;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(247, 250, 255, .76);
}

.page-about .version-figure {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid rgba(255, 107, 53, .32);
}

.page-about .version-figure img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
}

/* ---------- 05 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: clamp(18px, 3vw, 26px);
}

.page-about .partner-block {
  padding: 26px 24px;
  border-radius: var(--radius-card);
  background: rgba(255, 255, 255, .58);
  border: 1px solid var(--paper-shade);
}

.page-about .partner-title {
  margin: 0 0 12px;
  font-size: clamp(17px, 2.4vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper-ink);
}

.page-about .partner-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(20, 33, 61, .78);
}

.page-about .partner-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  letter-spacing: .04em;
  color: #0d5b52;
  text-decoration: none;
  border-bottom: 1px solid rgba(13, 91, 82, .45);
  padding-bottom: 3px;
}

.page-about .partner-link:hover,
.page-about .partner-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 06 理念 ---------- */
.page-about .about-creed {
  position: relative;
  overflow: hidden;
  padding: clamp(60px, 10vw, 120px) 0 clamp(64px, 10vw, 118px);
  background:
    radial-gradient(90% 80% at 50% 0%, rgba(0, 229, 201, .18), transparent 60%),
    linear-gradient(180deg, var(--ink) 0%, var(--night) 100%);
  border-top: 1px solid rgba(0, 229, 201, .3);
}

.page-about .creed-inner {
  position: relative;
  z-index: 1;
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.page-about .creed-mark {
  display: inline-block;
  margin: 0 0 clamp(18px, 3vw, 26px);
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(0, 229, 201, .45);
  font-size: 13px;
  letter-spacing: .24em;
  color: var(--cyan);
}

.page-about .creed-title {
  margin: 0 0 clamp(18px, 3vw, 26px);
  font-size: clamp(26px, 5.4vw, 50px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .creed-text {
  margin: 0 0 clamp(26px, 4vw, 38px);
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.85;
  color: rgba(247, 250, 255, .8);
}

.page-about .creed-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.page-about .creed-note {
  margin: clamp(24px, 4vw, 34px) 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(124, 144, 181, .95);
}

.page-about .creed-note a {
  color: var(--cyan-mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 255, 240, .4);
  padding-bottom: 2px;
}

.page-about .creed-note a:hover,
.page-about .creed-note a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .team-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .partner-block:last-child {
    grid-column: 1 / -1;
  }

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

  .page-about .coverage-stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: 96px minmax(0, 1fr) minmax(0, 320px);
    grid-template-areas: "rail copy stats";
    align-items: start;
  }

  .page-about .about-hero-rail {
    grid-area: rail;
    writing-mode: vertical-rl;
    padding: 6px 0 6px 16px;
    letter-spacing: .26em;
  }

  .page-about .about-hero-copy {
    grid-area: copy;
  }

  .page-about .about-hero-stats {
    grid-area: stats;
    gap: 14px;
  }

  .page-about .chapter-inner {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 116px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 14px;
  }

  .page-about .chapter-rail-text {
    writing-mode: vertical-rl;
    letter-spacing: .32em;
  }

  .page-about .chapter-cols {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: start;
  }

  .page-about .team-cards {
    grid-template-columns: .98fr .86fr 1.12fr;
    gap: 20px;
    align-items: start;
  }

  .page-about .team-card:nth-child(2) {
    margin-top: 46px;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 18px;
  }

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

  .page-about .coverage-stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .version-timeline {
    padding-left: 34px;
  }

  .page-about .version-item::before {
    left: -34px;
  }

  .page-about .version-timeline::before {
    left: 6px;
  }

  .page-about .partner-grid {
    grid-template-columns: 1.1fr .95fr 1fr;
  }

  .page-about .partner-block:last-child {
    grid-column: auto;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-stats {
    align-content: start;
  }

  .page-about .about-stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    border-radius: var(--radius-sm);
  }
}

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

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