.page-about {
  --about-line: rgba(107, 26, 26, .16);
  --about-line-strong: rgba(107, 26, 26, .3);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 34px 56px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  margin-top: 24px;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(36px, 7vw, 72px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero__title span {
  display: block;
}

.page-about .about-hero__title em {
  display: block;
  margin-top: 10px;
  font-family: var(--font-serif);
  font-style: normal;
  font-weight: 300;
  font-size: .48em;
  line-height: 1.3;
  letter-spacing: 0;
  color: var(--crimson);
}

.page-about .about-hero__text {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-stats {
  list-style: none;
  margin: 32px 0 0;
  padding: 20px 0 0;
  border-top: 2px solid var(--crimson);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-stats b {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--crimson-deep);
}

.page-about .about-stats span {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-soft);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  padding: 9px;
  background: var(--paper);
  border: 2px solid var(--crimson);
  box-shadow: var(--sheet);
}

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  left: -2px;
  right: -2px;
  top: -11px;
  height: 7px;
  background: repeating-linear-gradient(90deg, var(--crimson) 0 1px, transparent 1px 12px);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  filter: saturate(.92) contrast(1.03);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-sec {
  padding-block: 56px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-sec__head {
  max-width: 44em;
  margin-bottom: 34px;
}

.page-about .about-sec__title {
  margin: 12px 0 14px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(25px, 4.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about .about-sec__title em {
  font-family: var(--font-serif);
  font-style: normal;
  font-weight: 300;
  color: var(--crimson);
}

.page-about .about-sec__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 36px;
  display: grid;
  gap: 24px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--crimson) 0%, var(--crimson) 58%, rgba(142, 42, 34, .2) 100%);
}

.page-about .about-tl {
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: 26px;
  left: -31px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 2px var(--crimson);
  z-index: 2;
}

.page-about .about-tl__card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--about-line-strong);
  border-radius: var(--radius);
  padding: 20px 18px 22px;
  box-shadow: var(--sheet-sm);
  transition: border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .about-tl__card:hover {
  border-color: var(--crimson);
  box-shadow: 7px 7px 0 var(--paper-2), 7px 7px 0 1px rgba(107, 26, 26, .22);
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--crimson-deep);
}

.page-about .about-tl__year::before {
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  margin-bottom: 12px;
  background: var(--gold);
}

.page-about .about-tl__name {
  margin: 14px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -.005em;
  color: var(--ink);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-tl__meta {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--teal);
}

.page-about .about-tl__figure {
  margin: 16px 0 0;
  padding: 6px;
  background: var(--paper-2);
  border: 1px solid var(--about-line);
}

.page-about .about-tl__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

/* ---------- 评测小组 ---------- */
.page-about .about-eval__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-eval__figure {
  margin: 0;
  padding: 8px;
  background: var(--paper);
  border: 1px solid var(--about-line-strong);
  box-shadow: var(--sheet);
}

.page-about .about-eval__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-eval__title {
  margin: 12px 0 14px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(24px, 4.2vw, 36px);
  line-height: 1.22;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about .about-eval__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-eval__steps {
  list-style: none;
  counter-reset: ev;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 15px;
}

.page-about .about-eval__steps li {
  position: relative;
  padding-left: 42px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-eval__steps li::before {
  counter-increment: ev;
  content: counter(ev, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--crimson);
  border-bottom: 2px solid var(--gold);
}

.page-about .about-eval__foot {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--gold-light);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--teal);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-reach__frame {
  display: grid;
  gap: 26px;
  padding: 24px 20px;
  background: var(--paper);
  border: 2px solid var(--crimson);
  box-shadow: var(--sheet-sm);
}

.page-about .about-reach__title {
  margin: 12px 0 14px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(23px, 4vw, 34px);
  line-height: 1.24;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about .about-reach__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .about-reach__list li {
  display: grid;
  gap: 5px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-reach__list li:first-child {
  border-top: 1px solid var(--about-line);
}

.page-about .about-reach__list b {
  font-size: 15px;
  font-weight: 700;
  color: var(--crimson-deep);
}

.page-about .about-reach__list span {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 三条做法 ---------- */
.page-about .about-practice__grid {
  display: grid;
  gap: 20px;
}

.page-about .about-practice__card {
  padding: 22px 20px 24px;
  background: var(--paper);
  border: 2px solid var(--crimson);
  box-shadow: var(--sheet-sm);
}

.page-about .about-practice__num {
  display: inline-block;
  margin-bottom: 14px;
  padding-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--crimson);
  border-bottom: 2px solid var(--gold);
}

.page-about .about-practice__name {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-practice__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  padding-block: 52px 72px;
}

.page-about .about-next__row {
  display: grid;
  gap: 22px;
}

.page-about .about-next__title {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(23px, 4vw, 34px);
  line-height: 1.24;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about .about-next__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding-block: 46px 68px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, .58fr);
    gap: 60px;
    align-items: end;
    margin-top: 30px;
  }

  .page-about .about-eval__grid {
    grid-template-columns: minmax(0, .94fr) minmax(0, 1.06fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .about-reach__frame {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 48px;
    padding: 36px 34px;
    align-items: start;
  }

  .page-about .about-practice__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-next__row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: 40px;
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 980px) {
  .page-about .about-sec {
    padding-block: 72px;
  }

  .page-about .about-timeline {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 76px;
    row-gap: 40px;
    padding-left: 0;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .about-tl:nth-child(odd) {
    grid-column: 1;
  }

  .page-about .about-tl:nth-child(even) {
    grid-column: 2;
  }

  .page-about .about-tl:nth-child(odd)::before {
    left: auto;
    right: -45px;
  }

  .page-about .about-tl:nth-child(even)::before {
    left: -45px;
  }

  .page-about .about-tl__card {
    padding: 24px 24px 26px;
  }
}

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