.page-about {
  --about-paper-ink: #6b5a3f;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  padding: clamp(1.6rem, 4vw, 2.6rem) 0 clamp(2.2rem, 6vw, 4rem);
}

.page-about .about-hero__glow {
  position: absolute;
  top: -32%;
  right: -20%;
  width: min(42rem, 92vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 45% 45%, rgba(45, 245, 208, 0.2), rgba(45, 245, 208, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero__slice {
  position: absolute;
  right: -14%;
  bottom: -60%;
  width: 58%;
  height: 165%;
  background: var(--ink-2);
  transform: rotate(17deg);
  pointer-events: none;
  opacity: 0.75;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .eyebrow {
  margin: clamp(1.4rem, 4vw, 2.4rem) 0 0;
}

.page-about .about-hero h1 {
  margin: 0.7rem 0 0;
  font-size: clamp(2rem, 5.4vw, 3.7rem);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 17.5ch;
}

.page-about .about-hero .lede {
  margin: clamp(1rem, 2.6vw, 1.5rem) 0 0;
  max-width: 60ch;
  color: var(--mist);
  font-size: clamp(1rem, 1.8vw, 1.1rem);
  line-height: 1.75;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.8rem, 4.5vw, 2.8rem) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-facts__cell {
  background: var(--ink-2);
  padding: 0.95rem 1.1rem 1.05rem;
}

.page-about .about-facts__cell dt {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  color: var(--mist);
  line-height: 1.4;
}

.page-about .about-facts__cell dd {
  margin: 0.45rem 0 0;
  font-family: var(--font-num);
  font-size: clamp(1.1rem, 2.6vw, 1.48rem);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.1;
}

/* ---------- 正文骨架 ---------- */

.page-about .about-body {
  background: var(--ink);
  padding: clamp(2.2rem, 5.5vw, 4.4rem) 0 clamp(2.6rem, 6vw, 5rem);
}

.page-about .about-body__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-rail__label {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.42rem 0.85rem 0.42rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--ink-2);
  color: var(--mist);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--white);
  border-color: rgba(45, 245, 208, 0.5);
  background: var(--cyan-soft);
}

.page-about .about-rail__num {
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  scroll-margin-top: 5.5rem;
  padding-bottom: clamp(2.4rem, 5vw, 3.6rem);
}

.page-about .about-chapter + .about-chapter {
  padding-top: clamp(2.4rem, 5vw, 3.6rem);
  border-top: 1px solid var(--line);
}

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

.page-about .about-chapter__idx {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-chapter__title {
  margin: 0.6rem 0 0;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1.2;
  font-weight: 750;
  letter-spacing: -0.01em;
  color: var(--white);
  max-width: 21ch;
}

.page-about .about-chapter__body {
  margin: clamp(1rem, 2.4vw, 1.35rem) 0 0;
}

.page-about .about-chapter__body p {
  margin: 0 0 1.05rem;
  max-width: 62ch;
  color: var(--mist);
  font-size: clamp(0.98rem, 1.6vw, 1.06rem);
  line-height: 1.78;
}

.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: clamp(1.6rem, 3.6vw, 2.4rem) 0 0;
}

.page-about .about-figure .media-frame {
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ink-2);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.page-about .about-figure:hover img {
  transform: scale(1.02);
}

.page-about .about-figure .figure__caption {
  margin: 0.7rem 0 0;
  font-family: var(--font-num);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: clamp(1.5rem, 3.2vw, 2.1rem) 0 0;
  padding: 0 0 0 1.5rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.9rem;
  bottom: 0.9rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 72%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0.4rem 0 0.9rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.9rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--graphite);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-timeline__item:hover::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}

.page-about .about-timeline__year {
  margin: 0;
  font-size: 0.86rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-timeline__text {
  margin: 0.35rem 0 0;
  max-width: 56ch;
  font-size: 0.96rem;
  line-height: 1.68;
  color: var(--mist);
}

/* ---------- 刷新对比 ---------- */

.page-about .about-refresh {
  margin: clamp(1.6rem, 3.6vw, 2.3rem) 0 0;
  padding: 1.05rem 1.2rem 1.3rem;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.page-about .about-refresh__title {
  margin: 0 0 0.7rem;
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-refresh__row {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  grid-template-areas:
    "label value"
    "bar bar";
  align-items: center;
  gap: 0.3rem 0.8rem;
  padding: 0.6rem 0;
}

.page-about .about-refresh__row + .about-refresh__row {
  border-top: 1px dashed var(--line);
}

.page-about .about-refresh__label {
  grid-area: label;
  font-size: 0.86rem;
  color: var(--mist);
}

.page-about .about-refresh__val {
  grid-area: value;
  justify-self: start;
  font-size: 1rem;
  color: var(--white);
}

.page-about .about-refresh__bar {
  grid-area: bar;
  height: 6px;
  border-radius: var(--pill);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-refresh__bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
}

.page-about .about-refresh__bar--old i {
  width: 100%;
  background: var(--graphite);
}

.page-about .about-refresh__bar--new i {
  width: 25%;
  background: var(--cyan);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(1.6rem, 3.6vw, 2.3rem) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-team__cell {
  background: var(--ink-2);
  padding: 1.2rem 1.15rem 1.35rem;
  transition: background 0.25s ease;
}

.page-about .about-team__cell:hover {
  background: #16233d;
}

.page-about .about-team__num {
  margin: 0;
  font-size: clamp(1.7rem, 3.2vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team__role {
  margin: 0.65rem 0 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-team__desc {
  margin: 0.45rem 0 0;
  font-size: 0.9rem;
  line-height: 1.62;
  color: var(--mist);
}

/* ---------- 合作与荣誉 ---------- */

.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(1.6rem, 3.6vw, 2.2rem) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-partners__stat {
  background: var(--ink-2);
  padding: 1.25rem 1.2rem 1.4rem;
}

.page-about .about-partners__num {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .about-partners__label {
  margin: 0.65rem 0 0;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--cyan);
}

.page-about .about-partners__note {
  margin: 0.45rem 0 0;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-honors {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
  margin: clamp(1.1rem, 2.6vw, 1.5rem) 0 0;
}

.page-about .about-honors__item {
  position: relative;
  background: var(--paper);
  border-radius: var(--radius-md);
  padding: 1.05rem 1.2rem 1.2rem;
  overflow: hidden;
}

.page-about .about-honors__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--amber);
}

.page-about .about-honors__year {
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--about-paper-ink);
}

.page-about .about-honors__name {
  margin: 0.45rem 0 0;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.42;
  color: var(--ink);
}

/* ---------- 结尾动作 ---------- */

.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: clamp(1.6rem, 3.6vw, 2.2rem) 0 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-refresh__row {
    grid-template-columns: 3.2rem 7.6rem minmax(0, 1fr);
    grid-template-areas: "label value bar";
    gap: 0 1rem;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-body__inner {
    grid-template-columns: 158px minmax(0, 1fr);
    gap: clamp(2.2rem, 5vw, 4.4rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: 6.5rem;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.12rem;
  }

  .page-about .about-rail__link {
    width: 100%;
    justify-content: flex-start;
    border-color: transparent;
    background: transparent;
    padding: 0.42rem 0.6rem;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-color: var(--line);
    background: var(--ink-2);
  }

  .page-about .about-hero h1 {
    max-width: 20ch;
  }
}

@media (min-width: 1024px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure img,
  .page-about .about-timeline__item::before,
  .page-about .about-rail__link,
  .page-about .about-team__cell {
    transition: none;
  }

  .page-about .about-figure:hover img {
    transform: none;
  }
}