.page-about {
  --about-line: rgba(46, 90, 80, 0.85);
  --about-body: rgba(247, 251, 248, 0.78);
  --about-muted: var(--mist);
  --about-strong: var(--white);
  background-color: var(--ink);
  color: var(--about-body);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

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

.page-about .about-wrap {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 52px) clamp(28px, 4.5vw, 56px);
  background:
    radial-gradient(120% 85% at 80% -15%, rgba(61, 224, 208, 0.12), transparent 62%),
    radial-gradient(95% 65% at 6% 0%, rgba(255, 106, 42, 0.1), transparent 58%),
    var(--ink);
  border-bottom: var(--hairline);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 48px);
}

.page-about .about-hero-media {
  position: relative;
  margin: 0;
  padding: 10px;
  background: var(--ink-2);
  border: var(--hairline);
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  inset: 10px;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(46, 90, 80, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 90, 80, 0.55) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.32;
}

.page-about .about-hero-media figcaption {
  position: relative;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

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

.page-about .about-rot {
  display: none;
}

.page-about .breadcrumb {
  margin-bottom: clamp(14px, 2.5vw, 24px);
}

.page-about .about-h1 {
  margin: 8px 0 0;
  font-size: clamp(2.5rem, 8.4vw, 5.6rem);
  line-height: 0.96;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .about-h1 em {
  font-style: normal;
  color: var(--orange);
}

.page-about .about-lede {
  max-width: 46ch;
  margin: clamp(18px, 3vw, 30px) 0 0;
  font-size: clamp(1rem, 1.7vw, 1.12rem);
  line-height: 1.85;
  color: rgba(247, 251, 248, 0.82);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.5vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: var(--hairline);
}

.page-about .about-figures li {
  padding: clamp(12px, 2vw, 18px);
  background: rgba(11, 43, 38, 0.72);
}

.page-about .about-fig-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-fig-num sup {
  font-size: 0.55em;
  vertical-align: super;
}

.page-about .about-fig-label {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  margin-top: clamp(28px, 4.5vw, 52px);
  padding-top: 14px;
  border-top: var(--hairline);
}

.page-about .about-index ol {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 2px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  outline: none;
}

.page-about .about-index .ix {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding-block: clamp(44px, 7vw, 92px);
}

.page-about .about-section--paper {
  --about-line: rgba(11, 43, 38, 0.2);
  --about-body: #33463f;
  --about-muted: #62746b;
  --about-strong: var(--ink);
  background-color: var(--paper);
  color: #33463f;
  border-top: var(--hairline);
  border-bottom: var(--hairline);
}

.page-about .about-section--dark {
  --about-line: rgba(46, 90, 80, 0.85);
  --about-body: rgba(247, 251, 248, 0.78);
  --about-muted: var(--mist);
  --about-strong: var(--white);
  background-color: var(--ink);
  color: rgba(247, 251, 248, 0.78);
}

.page-about .about-sec-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 3vw, 30px);
  margin-bottom: clamp(24px, 4vw, 44px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-sec-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 8vw, 5rem);
  font-weight: 600;
  line-height: 0.78;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px var(--about-line);
}

.page-about .about-kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--about-muted);
}

.page-about .about-sec-title {
  margin: 0;
  font-size: clamp(1.65rem, 4.4vw, 2.9rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--about-strong);
}

.page-about .about-prose {
  max-width: 62ch;
  margin: 0 0 1.1em;
  font-size: clamp(0.98rem, 1.4vw, 1.06rem);
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-section--paper a:not(.btn) {
  color: var(--ink);
}

/* ---------- 01 起点 ---------- */

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-tenets {
  align-self: start;
  padding: clamp(16px, 2.6vw, 24px);
  border: 1px solid var(--about-line);
  background: rgba(255, 255, 255, 0.45);
  box-shadow: 0 1px 0 rgba(11, 43, 38, 0.05);
}

.page-about .about-tenets ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tenets li {
  display: flex;
  gap: 12px;
  padding-block: 12px;
  border-bottom: 1px solid var(--about-line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .about-tenets li:first-child {
  padding-top: 0;
}

.page-about .about-tenets li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-tenet-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

/* ---------- 02 时间线 ---------- */

.page-about .about-tl-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-axis {
  display: block;
  width: 100%;
  height: 20px;
  margin-bottom: clamp(16px, 2.5vw, 26px);
}

.page-about .about-tl {
  margin: 0;
  padding: 0 0 0 18px;
  list-style: none;
  border-left: 1px solid var(--about-line);
}

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

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 20px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 2px solid var(--orange);
  border-radius: 50%;
}

.page-about .about-tl details {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-tl summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: clamp(14px, 2vw, 18px) 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-tl details[open] summary::after {
  content: "–";
}

.page-about .about-tl summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-tl-year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.4vw, 1.45rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .about-tl-name {
  font-size: clamp(0.98rem, 1.8vw, 1.12rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-tl details p {
  margin: 0 0 18px;
  padding-right: 26px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(247, 251, 248, 0.72);
}

.page-about .about-media {
  margin: 0;
  padding: 8px;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  align-self: start;
}

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

.page-about .about-media figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--about-muted);
}

.page-about .about-section--paper .about-media {
  background: var(--sand);
  border-color: rgba(11, 43, 38, 0.22);
}

/* ---------- 03 团队 ---------- */

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-team-media {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-team-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .about-card {
  padding: clamp(14px, 2.2vw, 20px);
  border: 1px solid var(--about-line);
  background: rgba(255, 255, 255, 0.5);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-card:hover {
  border-color: rgba(255, 106, 42, 0.75);
  background: rgba(255, 255, 255, 0.78);
}

.page-about .about-card-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-card-title {
  margin: 8px 0 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--about-strong);
}

.page-about .about-card p {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--about-muted);
}

/* ---------- 04 合作 ---------- */

.page-about .about-partners-lede {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-partner {
  padding: clamp(16px, 2.5vw, 24px);
  border: 1px solid var(--about-line);
  background: rgba(18, 61, 53, 0.6);
}

.page-about .p-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-partner h3 {
  margin: 10px 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(247, 251, 248, 0.7);
}

.page-about .about-sub-title {
  margin: clamp(30px, 4vw, 44px) 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-steps li {
  padding: 14px 16px;
  background: rgba(18, 61, 53, 0.72);
  font-size: 13.5px;
  color: rgba(247, 251, 248, 0.82);
}

.page-about .about-steps li span {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .about-honors {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-honors li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--about-line);
  font-size: 14px;
  color: rgba(247, 251, 248, 0.82);
}

.page-about .about-honors .y {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-honor-note {
  max-width: 56ch;
  margin: 18px 0 22px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta {
  display: inline-block;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  background: var(--orange);
  border: 1px solid var(--orange);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background-color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-cta:hover,
.page-about .about-cta:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  outline: none;
}

/* ---------- 05 同行 ---------- */

.page-about .about-audience {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.5vw, 24px);
}

.page-about .about-aud {
  padding-left: 16px;
  border-left: 3px solid var(--orange);
}

.page-about .about-aud h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--about-strong);
}

.page-about .about-aud p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-aud a {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 4px;
}

.page-about .about-aud a:hover,
.page-about .about-aud a:focus-visible {
  color: #b8461a;
  text-decoration-color: #b8461a;
}

.page-about .about-outro-text {
  max-width: 60ch;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-top {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-top-link {
  display: inline-block;
  padding: 8px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
}

.page-about .about-top-link:hover,
.page-about .about-top-link:focus-visible {
  color: #b8461a;
  border-bottom-color: #b8461a;
  outline: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero-media img {
    aspect-ratio: 16 / 10;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(260px, 0.78fr) minmax(0, 1.22fr);
    align-items: start;
  }

  .page-about .about-hero-media img {
    aspect-ratio: 3 / 4;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.68fr);
  }

  .page-about .about-tl-grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.68fr);
    align-items: start;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-team-cards {
    grid-template-columns: 1fr;
  }

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

@media (min-width: 1024px) {
  .page-about .about-hero-copy {
    padding-right: 44px;
  }

  .page-about .about-rot {
    display: block;
    position: absolute;
    top: 4px;
    right: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--cyan);
    opacity: 0.85;
  }

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

  .page-about .about-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .about-card,
  .page-about .about-cta {
    transition: none;
  }
}