.page-about {
  --about-pad: clamp(44px, 8vw, 96px);
  --about-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "STSong", serif;
}

.page-about .about-crumb {
  padding-top: clamp(14px, 3vw, 26px);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(18px, 4vw, 34px) 0 clamp(42px, 7vw, 76px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(46, 127, 122, 0.20), transparent 62%),
    radial-gradient(80% 70% at 0% 100%, rgba(232, 179, 60, 0.08), transparent 60%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 46px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(38px, 7.4vw, 78px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--text);
}

.page-about .about-hero__title span {
  color: var(--amber);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 3vw, 24px) 0 0;
  max-width: 30em;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-hero__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-jump {
  padding: 16px 20px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-l) var(--radius-s) var(--radius-l) var(--radius-s);
  background: var(--surface);
}

.page-about .about-jump__title {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

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

.page-about .about-jump__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.5;
  transition: color 180ms var(--ease);
}

.page-about .about-jump__list li:first-child .about-jump__link {
  border-top: 0;
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--fen-soft);
}

.page-about .about-jump__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--fen-soft);
}

.page-about .about-facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: clamp(30px, 5vw, 46px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--border);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 28px);
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--text-dim);
}

/* 通用区块与文字 */
.page-about .about-section {
  padding: var(--about-pad) 0;
}

.page-about .about-head {
  max-width: 46em;
}

.page-about .about-head h2,
.page-about .about-copy h2 {
  margin: 10px 0 0;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--text);
}

.page-about .about-head__lead {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-copy p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-copy h2 + p {
  margin-top: 16px;
}

.page-about .about-copy p + p {
  margin-top: 14px;
}

.page-about .about-copy p.about-note {
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--fen-soft);
}

/* 起步与定位 */
.page-about .about-start__grid {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
}

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: var(--radius-s) var(--radius-l) var(--radius-s) var(--radius-l);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

/* 团队与分工 */
.page-about .team-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .team-card {
  position: relative;
  padding: 22px 22px 24px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  transition: border-color 180ms var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 1px;
  border-radius: 2px;
  background: var(--amber);
  transition: width 180ms var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--fen);
}

.page-about .team-card:hover::before,
.page-about .team-card:focus-within::before {
  width: 3px;
}

.page-about .team-card__role {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--fen-soft);
}

.page-about .team-card__title {
  margin: 8px 0 0;
  font-size: 20px;
  line-height: 1.35;
  font-weight: 800;
  color: var(--text);
}

.page-about .team-card__body {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .team-card__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .team-card__item {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .team-card__item + .team-card__item {
  margin-top: 8px;
}

.page-about .team-card__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--amber);
}

.page-about .about-flow {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin: clamp(24px, 4vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-flow__step {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
}

.page-about .about-flow__step:last-child {
  border-color: var(--fen);
  color: var(--fen-soft);
}

.page-about .about-flow__arrow {
  font-size: 12px;
  color: var(--fen-soft);
}

.page-about .about-figure--wide {
  margin-top: clamp(26px, 5vw, 42px);
}

.page-about .about-quote {
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 2px 0 2px clamp(18px, 3vw, 26px);
  border-left: 3px solid var(--cinnabar);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--about-serif);
  font-size: clamp(19px, 2.6vw, 25px);
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-quote__by {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

/* 版本时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 26px;
}

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

.page-about .about-timeline__ver {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--fen);
}

.page-about .about-timeline__body {
  position: relative;
  padding: 0 0 2px 18px;
  border-left: 1px solid var(--border);
}

.page-about .about-timeline__body::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--fen);
}

.page-about .about-timeline__item:last-child .about-timeline__body::before {
  background: var(--amber);
}

.page-about .about-timeline__title {
  margin: 0;
  font-size: clamp(18px, 2.4vw, 22px);
  line-height: 1.4;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-timeline__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-timeline__extra {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--text-dim);
  transition: color 180ms var(--ease), padding-left 180ms var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__extra,
.page-about .about-timeline__item:focus-within .about-timeline__extra {
  color: var(--amber);
  padding-left: 6px;
}

/* 案例合集专栏 */
.page-about .about-archive__grid {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
}

.page-about .tag-row {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .archive-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(24px, 4vw, 34px);
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.page-about .archive-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 3vw, 26px);
  color: var(--amber);
}

.page-about .archive-stat__label {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--text-dim);
}

/* 找对入口 */
.page-about .about-reach {
  padding-bottom: clamp(80px, 13vw, 150px);
}

.page-about .reach-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .reach-card {
  display: block;
  padding: 20px 22px 22px;
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-s) var(--radius-l) var(--radius-s) var(--radius-l);
  transition: border-color 180ms var(--ease);
}

.page-about .reach-card:hover,
.page-about .reach-card:focus-visible {
  border-color: var(--fen-soft);
}

.page-about .reach-card__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--fen-soft);
}

.page-about .reach-card__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .reach-card__go {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--amber);
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease);
}

.page-about .reach-card:hover .reach-card__go,
.page-about .reach-card:focus-visible .reach-card__go {
  border-bottom-color: var(--amber);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 38px);
}

/* 断点 */
@media (min-width: 720px) {
  .page-about .about-timeline__item {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-timeline__body {
    padding-left: 26px;
  }

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

@media (min-width: 820px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    align-items: start;
  }

  .page-about .team-card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 52px;
  }

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

@media (min-width: 900px) {
  .page-about .about-start__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-start__grid .about-figure {
    margin-top: 12px;
  }

  .page-about .about-archive__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .team-card::before,
  .page-about .reach-card,
  .page-about .reach-card__go,
  .page-about .about-jump__link,
  .page-about .about-timeline__extra {
    transition: none;
  }
}