.page-about {
  --about-pad: clamp(40px, 7vw, 88px);
  background: var(--navy);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

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

/* 面包屑 */
.page-about .breadcrumb {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 18px var(--gut) 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--grey);
}
.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}
.page-about .breadcrumb-item a {
  color: var(--cyan-soft);
  text-decoration: none;
}
.page-about .breadcrumb-item a:hover,
.page-about .breadcrumb-item a:focus-visible {
  color: var(--cyan);
  text-decoration: underline;
}

/* 首屏 */
.page-about .about-hero {
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(90% 70% at 90% 0%, rgba(39, 225, 210, .12), transparent 60%),
    var(--navy);
}
.page-about .hero-inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(28px, 5vw, 64px) clamp(36px, 6vw, 76px);
}
.page-about .hero-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .hero-year {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(76px, 24vw, 168px);
  line-height: .82;
  letter-spacing: -.05em;
  color: var(--navy-2);
  -webkit-text-stroke: 1px var(--cyan);
}
.page-about .hero-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(27px, 5.2vw, 50px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--white);
}
.page-about .hero-lead {
  max-width: 620px;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: rgba(244, 247, 248, .82);
}

.page-about .meta-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.page-about .meta-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.page-about .meta-key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--grey);
}
.page-about .meta-val {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-about .hero-media {
  margin: 0;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--navy-2);
  clip-path: polygon(0 0, 100% 0, 100% 84%, 84% 100%, 0 100%);
}
.page-about .hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .hero-toc {
  margin-top: 18px;
}
.page-about .toc-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--grey);
}
.page-about .toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .toc-list a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 8px 0;
  border-bottom: 1px solid rgba(30, 74, 102, .7);
  color: rgba(244, 247, 248, .76);
  font-size: 14px;
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}
.page-about .toc-list a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}
.page-about .toc-list a:hover,
.page-about .toc-list a:focus-visible {
  color: var(--cyan-soft);
  padding-left: 6px;
}

/* 通用章节 */
.page-about .about-section {
  padding-block: var(--about-pad);
  border-top: 1px solid var(--line);
}
.page-about .sec-index {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .sec-index::before {
  content: "";
  flex: none;
  width: 26px;
  height: 1px;
  background: var(--orange);
}
.page-about .sec-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--white);
}
.page-about .sec-lead {
  max-width: 660px;
  margin: 0 0 clamp(24px, 4vw, 40px);
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(244, 247, 248, .76);
}
.page-about .prose p {
  max-width: 640px;
  margin: 0 0 1.1em;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 247, 248, .8);
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}

.page-about .split {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

/* 老版 / 新版 对照 */
.page-about .compare {
  display: grid;
  align-content: start;
  border: 1px solid var(--line);
  background: rgba(14, 47, 79, .45);
}
.page-about .compare-row {
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
}
.page-about .compare-row:last-child {
  border-bottom: 0;
}
.page-about .compare-row.is-now {
  background: linear-gradient(135deg, rgba(39, 225, 210, .14), rgba(7, 26, 47, 0) 80%);
}
.page-about .compare-label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--grey);
}
.page-about .compare-row.is-now .compare-label {
  color: var(--cyan);
}
.page-about .compare-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(244, 247, 248, .86);
}

/* 时间轴 */
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}
.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 65%, rgba(30, 74, 102, 0));
}
.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 40px);
}
.page-about .tl-item:last-child {
  padding-bottom: 0;
}
.page-about .tl-dot {
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--navy-2);
  border: 1px solid var(--cyan);
  box-sizing: border-box;
}
.page-about .tl-item.is-active .tl-dot {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 107, 61, .16);
}
.page-about .tl-time {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--cyan);
}
.page-about .tl-item.is-active .tl-time {
  color: var(--orange);
}
.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 24px);
  letter-spacing: -.01em;
  color: var(--white);
}
.page-about .tl-text {
  max-width: 620px;
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(244, 247, 248, .78);
}
.page-about .tl-details {
  max-width: 620px;
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--line);
}
.page-about .tl-details summary {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan-soft);
}
.page-about .tl-details summary::-webkit-details-marker {
  display: none;
}
.page-about .tl-details summary::before {
  content: "+";
  font-size: 14px;
  line-height: 1;
  color: var(--orange);
}
.page-about .tl-details[open] summary::before {
  content: "–";
}
.page-about .tl-details summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
.page-about .tl-details p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 247, 248, .72);
}

/* 画框 */
.page-about .frame {
  margin: 0;
  overflow: hidden;
  background: var(--navy-2);
  clip-path: polygon(0 0, 100% 0, 100% 90%, 92% 100%, 0 100%);
}
.page-about .frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .tl-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}
.page-about .tl-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--grey);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}
.page-about .team-media {
  margin: 0;
}
.page-about .stat-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  border: 1px solid var(--line);
  background: var(--line);
}
.page-about .stat {
  padding: 16px 14px;
  background: var(--navy);
}
.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1.1;
  color: var(--cyan);
}
.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--grey);
}

/* 浅色内容线分区 */
.page-about .about-lines {
  background: var(--white);
  color: var(--ink);
}
.page-about .about-lines .sec-index {
  color: var(--line);
}
.page-about .about-lines .sec-title {
  color: var(--ink);
}
.page-about .about-lines .sec-lead {
  color: var(--grey);
}
.page-about .line-grid {
  display: grid;
  gap: 1px;
  border: 1px solid rgba(16, 24, 32, .14);
  background: rgba(16, 24, 32, .14);
}
.page-about .line-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 3vw, 30px);
  background: var(--white);
}
.page-about .line-num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--orange);
}
.page-about .line-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-about .line-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--grey);
}
.page-about .line-tag {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--line);
}
.page-about .check-note {
  margin-top: clamp(20px, 3vw, 32px);
  padding: 14px 0 14px 18px;
  border-left: 3px solid var(--orange);
}
.page-about .check-note p {
  max-width: 720px;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--grey);
}
.page-about .check-note strong {
  color: var(--ink);
  font-weight: 700;
}

/* 查记录 */
.page-about .record-grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
  align-items: start;
}
.page-about .record-panel {
  padding: clamp(4px, 1vw, 8px);
  border: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(14, 47, 79, .9), rgba(7, 26, 47, .3));
}
.page-about .filter-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
}
.page-about .filter-list li {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--navy);
}
.page-about .filter-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .filter-val {
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 247, 248, .82);
}
.page-about .record-copy p {
  margin-bottom: 1.2em;
}
.page-about .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 联系 */
.page-about .about-contact {
  background:
    radial-gradient(80% 90% at 10% 100%, rgba(255, 107, 61, .1), transparent 65%),
    var(--navy);
}
.page-about .contact-block {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}
.page-about .contact-card {
  border: 1px solid var(--line);
  background: rgba(14, 47, 79, .4);
}
.page-about .contact-row {
  display: grid;
  gap: 4px;
  padding: 15px 18px;
  border-bottom: 1px solid var(--line);
}
.page-about .contact-row:last-child {
  border-bottom: 0;
}
.page-about .contact-key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--grey);
}
.page-about .contact-val {
  font-family: var(--font-mono);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--white);
  overflow-wrap: anywhere;
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .meta-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .line-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .contact-row {
    grid-template-columns: 110px minmax(0, 1fr);
    align-items: baseline;
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .hero-inner {
    grid-template-columns: 1.12fr .88fr;
    align-items: start;
  }
  .page-about .split {
    grid-template-columns: 1.15fr .85fr;
  }
  .page-about .team-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .record-grid {
    grid-template-columns: .85fr 1.15fr;
  }
  .page-about .contact-block {
    grid-template-columns: 1.1fr .9fr;
  }
  .page-about .tl {
    padding-left: 34px;
  }
  .page-about .tl::before {
    left: 7px;
  }
  .page-about .tl-dot {
    left: -32px;
    width: 15px;
    height: 15px;
    top: 4px;
  }
  .page-about .tl-item {
    padding-bottom: 46px;
  }
  .page-about .team-media {
    margin-top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-list a {
    transition: none;
  }
}
</main>