.page-about {
  color: var(--snow);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(16px, 3vw, 34px) 0 clamp(34px, 6vw, 70px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(30px, 7vw, 56px);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--snow);
  margin: 12px 0 0;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--cloud);
}

.page-about .about-hero__figure {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
}

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

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(30px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__stats li {
  background: var(--panel);
  padding: clamp(15px, 2.4vw, 24px);
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-about .about-hero__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--cloud);
}

/* ---------- 阶段快速跳转 ---------- */
.page-about .stage-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .stage-jump a {
  display: inline-block;
  padding: 7px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--cloud);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .stage-jump a:hover,
.page-about .stage-jump a:focus-visible {
  color: var(--snow);
  border-color: var(--blue);
  transform: translateY(-2px);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(30px, 5vw, 56px) 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--blue), var(--green) 28%, var(--snow) 50%, var(--yellow) 74%, var(--red));
  opacity: 0.55;
}

.page-about .tl {
  position: relative;
  padding-left: 38px;
  padding-bottom: clamp(26px, 4vw, 40px);
}

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

.page-about .tl--blue { --accent: var(--blue); }
.page-about .tl--green { --accent: var(--green); }
.page-about .tl--snow { --accent: var(--snow); }
.page-about .tl--yellow { --accent: var(--yellow); }
.page-about .tl--red { --accent: var(--red); }

.page-about .tl__marker {
  position: absolute;
  left: 0;
  top: 12px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--night);
  border: 3px solid var(--accent, var(--blue));
  z-index: 1;
}

.page-about .tl__card {
  background: var(--panel);
  border-radius: var(--r-md);
  border-top: 3px solid var(--accent, var(--blue));
  padding: clamp(18px, 2.6vw, 28px);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent, var(--blue));
  margin-bottom: 12px;
}

.page-about .tl__title {
  font-family: var(--font-serif);
  font-size: clamp(19px, 2.3vw, 25px);
  line-height: 1.45;
  color: var(--snow);
  margin: 10px 0 0;
}

.page-about .tl__text {
  margin: 12px 0 0;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.9;
  color: var(--cloud);
}

.page-about .tl__more {
  margin-top: 16px;
}

.page-about .tl__more summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  list-style: none;
  font-size: 13.5px;
  color: var(--blue);
}

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

.page-about .tl__more summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
}

.page-about .tl__more[open] summary::before {
  content: "-";
}

.page-about .tl__more summary:hover {
  color: var(--snow);
}

.page-about .tl__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .tl__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cloud);
}

.page-about .tl__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent, var(--blue));
}

.page-about .tl__list strong {
  color: var(--snow);
  font-weight: 600;
}

.page-about .tl__media {
  margin: 18px 0 0;
  border-radius: var(--r-md);
  overflow: hidden;
}

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

/* ---------- 荣誉档案 ---------- */
.page-about .honor-grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .honor {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--night);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 18px 20px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .honor:hover,
.page-about .honor:focus-within {
  border-color: var(--gold);
  transform: translateY(-3px);
}

.page-about .honor__badge {
  flex: none;
  margin-top: 2px;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  background: var(--gold);
  color: var(--night);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .honor__body {
  min-width: 0;
}

.page-about .honor__name {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--snow);
}

.page-about .honor__date {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--yellow);
}

.page-about .honor__desc {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--cloud);
}

.page-about .honor-figure {
  margin-top: clamp(26px, 4vw, 46px);
}

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

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  background: linear-gradient(135deg, var(--panel), var(--night) 68%);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(24px, 4vw, 46px);
  text-align: center;
}

.page-about .about-cta__title {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.35;
  color: var(--snow);
  margin: 0;
}

.page-about .about-cta__text {
  margin: 14px auto 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--cloud);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
}

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

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

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
  }

  .page-about .timeline::before {
    left: 50%;
    transform: translateX(-50%);
    top: 0;
    bottom: 0;
  }

  .page-about .tl {
    width: 50%;
    padding-left: 0;
    padding-right: 58px;
    padding-bottom: clamp(34px, 5vw, 58px);
  }

  .page-about .tl--right {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 58px;
  }

  .page-about .tl__marker {
    left: auto;
    right: -10px;
    top: 26px;
  }

  .page-about .tl--right .tl__marker {
    right: auto;
    left: -10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-jump a,
  .page-about .honor {
    transition: none;
  }

  .page-about .stage-jump a:hover,
  .page-about .stage-jump a:focus-visible,
  .page-about .honor:hover,
  .page-about .honor:focus-within {
    transform: none;
  }
}