.page-about {
  background: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

.page-about [id] {
  scroll-margin-top: 104px;
}

.page-about .section {
  padding: clamp(56px, 9vw, 104px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero {
  border-top: 0;
  padding-top: clamp(40px, 7vw, 84px);
  padding-bottom: clamp(36px, 6vw, 64px);
  position: relative;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.35;
  -webkit-mask-image: radial-gradient(130% 90% at 15% 0%, #000 8%, transparent 72%);
  mask-image: radial-gradient(130% 90% at 15% 0%, #000 8%, transparent 72%);
  pointer-events: none;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .crumb-sep {
  color: var(--line);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about h1 {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  line-height: 1.18;
  letter-spacing: 0.03em;
  color: var(--white);
  margin: 0 0 22px;
  max-width: 22ch;
}

.page-about .lede {
  color: var(--text);
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.9;
  max-width: 70ch;
  margin: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: clamp(32px, 5vw, 52px) 0 0;
  padding: 0;
}

.page-about .about-stats > div {
  background: var(--ink);
  padding: 20px 18px 22px;
}

.page-about .about-stats dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-stats dd {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 500;
  color: var(--cyan);
  line-height: 1;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* 章节索引 */
.page-about .chapter-rail {
  position: sticky;
  top: 0;
  z-index: 6;
  background: rgba(11, 18, 48, 0.95);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.page-about .chapter-rail ul {
  display: flex;
  align-items: stretch;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0 clamp(16px, 5vw, 64px);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .chapter-rail li {
  flex: 0 0 auto;
}

.page-about .chapter-rail a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 14px;
  font-size: 14px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .chapter-rail a .num {
  font-size: 12px;
  color: var(--muted);
}

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

.page-about .chapter-rail a:hover .num,
.page-about .chapter-rail a:focus-visible .num {
  color: var(--cyan);
}

/* 章节标题 */
.page-about .section-head {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .section-head h2 {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(1.5rem, 3.2vw, 2.4rem);
  line-height: 1.25;
  letter-spacing: 0.04em;
  color: var(--white);
  margin: 0 0 16px;
  max-width: 26ch;
}

/* 取景框 */
.page-about .media-frame {
  position: relative;
  margin: 0 0 clamp(28px, 4vw, 44px);
  background: var(--panel);
  overflow: hidden;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .media-frame--square {
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.page-about .media-caption {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  padding: 12px 4px 0;
  border-top: 1px solid var(--line);
  margin-top: 2px;
}

/* 时间轴 */
.page-about .season-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .season-track::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 34%, var(--yellow) 64%, var(--red) 100%);
  opacity: 0.65;
}

.page-about .season-node {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 22px;
}

.page-about .season-node:last-child {
  padding-bottom: 0;
}

.page-about .season-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  position: relative;
  z-index: 1;
}

.page-about .season-node:nth-child(2) .season-mark { background: var(--cyan-soft); }
.page-about .season-node:nth-child(3) .season-mark { background: var(--yellow); }
.page-about .season-node:nth-child(4) .season-mark { background: var(--green); }
.page-about .season-node:nth-child(5) .season-mark { background: var(--violet); color: var(--white); }
.page-about .season-node:nth-child(6) .season-mark { background: var(--red); color: var(--white); }

.page-about .season-body {
  background: var(--panel);
  border-left: 3px solid var(--cyan);
  padding: 18px 20px 20px;
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.page-about .season-node:nth-child(2) .season-body { border-left-color: var(--cyan-soft); }
.page-about .season-node:nth-child(3) .season-body { border-left-color: var(--yellow); }
.page-about .season-node:nth-child(4) .season-body { border-left-color: var(--green); }
.page-about .season-node:nth-child(5) .season-body { border-left-color: var(--violet); }
.page-about .season-node:nth-child(6) .season-body { border-left-color: var(--red); }

.page-about .season-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 3px 8px;
  margin: 0 0 12px;
}

.page-about .season-body h3 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 17px;
  letter-spacing: 0.03em;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .season-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

/* 奖项体系 */
.page-about .award-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  list-style: none;
  margin: 0 0 clamp(32px, 5vw, 48px);
  padding: 0;
}

.page-about .award-card {
  background: var(--panel);
  border-top: 3px solid var(--cyan);
  padding: 20px 18px 22px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .award-card h3 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .award-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .award-card--violet { border-top-color: var(--violet); }
.page-about .award-card--cyan { border-top-color: var(--cyan); }
.page-about .award-card--green { border-top-color: var(--green); }
.page-about .award-card--red { border-top-color: var(--red); }
.page-about .award-card--yellow { border-top-color: var(--yellow); }
.page-about .award-card--white { border-top-color: var(--white); }

.page-about .award-lower {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .award-ledger h3 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--white);
  margin: 0 0 18px;
}

.page-about .ledger-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ledger-steps li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ledger-steps li > .num {
  font-size: 13px;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .ledger-steps strong {
  display: block;
  font-weight: 500;
  font-size: 15px;
  color: var(--white);
  margin-bottom: 6px;
}

.page-about .ledger-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* 编辑部 */
.page-about .team-grid {
  display: grid;
  gap: 16px;
}

.page-about .team-card {
  background: var(--panel);
  padding: 24px 22px 26px;
  border-left: 3px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .team-card:nth-child(1) { border-left-color: var(--cyan); }
.page-about .team-card:nth-child(2) { border-left-color: var(--violet); }
.page-about .team-card:nth-child(3) { border-left-color: var(--yellow); }

.page-about .team-index {
  font-size: 30px;
  font-weight: 500;
  line-height: 1;
  color: var(--line);
  margin: 0 0 14px;
}

.page-about .team-card h3 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 17px;
  letter-spacing: 0.05em;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text);
}

/* 数据来源 */
.page-about .source-split {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .source-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .source-figures .fig {
  background: var(--panel);
  padding: 22px 18px;
}

.page-about .source-figures .fig .num {
  display: block;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 500;
  line-height: 1;
  color: var(--green);
  margin-bottom: 10px;
}

.page-about .source-figures .fig p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .source-text h3 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 16px;
  letter-spacing: 0.05em;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .source-text h3:not(:first-child) {
  margin-top: 26px;
}

.page-about .source-text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text);
}

/* 未来规划 */
.page-about .ahead-split {
  display: grid;
  gap: 18px;
}

.page-about .ahead-col {
  background: var(--panel);
  padding: 26px 24px 28px;
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .ahead-col--violet {
  border-left-color: var(--violet);
}

.page-about .ahead-col h3 {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: 17px;
  letter-spacing: 0.05em;
  color: var(--white);
  margin: 0 0 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .ahead-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .ahead-list li:last-child {
  margin-bottom: 0;
}

.page-about .ahead-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.page-about .ahead-col--violet .ahead-list li::before {
  background: var(--violet);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(32px, 5vw, 48px);
  padding-top: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta .btn {
  text-decoration: none;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .award-lower {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .source-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    align-items: start;
  }

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

  .page-about .season-track {
    padding-left: 24px;
  }

  .page-about .season-node {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 22px;
    padding-bottom: 30px;
  }

  .page-about .season-mark {
    width: 56px;
    height: 56px;
    font-size: 14px;
  }

  .page-about .season-track::before {
    left: 52px;
  }

  .page-about .season-node:nth-child(4n + 2) .season-body { margin-left: 24px; }
  .page-about .season-node:nth-child(4n + 3) .season-body { margin-left: 12px; }
  .page-about .season-node:nth-child(4n + 4) .season-body { margin-left: 40px; }
}

@media (min-width: 1100px) {
  .page-about .season-node {
    grid-template-columns: 64px minmax(0, 1fr);
  }

  .page-about .season-mark {
    width: 64px;
    height: 64px;
  }

  .page-about .season-track::before {
    left: 60px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-rail a {
    transition: none;
  }
}