.page-about {
  padding-bottom: clamp(48px, 8vw, 96px);
  background:
    radial-gradient(85% 55% at 90% 0%, rgba(155, 220, 232, 0.08), transparent 62%),
    radial-gradient(60% 45% at 4% 30%, rgba(230, 255, 59, 0.05), transparent 68%);
}

.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 30px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .breadcrumb-link {
  color: var(--ice);
  text-decoration: none;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--white);
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 3.4vw, 40px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
  align-items: stretch;
}

.page-about .about-hero__body {
  order: 1;
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2vw, 22px);
}

.page-about .about-hero__visual {
  order: 2;
  position: relative;
  display: block;
  aspect-ratio: 16 / 11;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--green-3);
  border: 1px solid var(--line-soft);
}

.page-about .about-hero__visual img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.7;
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 26, 19, 0.1) 0%, rgba(8, 26, 19, 0.82) 100%);
  pointer-events: none;
}

.page-about .about-hero__badge {
  position: absolute;
  left: 18px;
  bottom: 18px;
  z-index: 1;
  display: inline-block;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  background: var(--yellow);
  color: var(--ink-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: rgba(243, 247, 242, 0.76);
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts li {
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(155, 220, 232, 0.05);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ice);
}

/* ---------- 分屏主体 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(44px, 7vw, 88px);
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .about-rail__link {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  text-decoration: none;
  color: var(--mist);
  transition: color 0.2s ease, transform 0.2s ease;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: rgba(143, 169, 157, 0.55);
  transition: color 0.2s ease;
}

.page-about .about-rail__name {
  font-size: 14px;
  line-height: 1.4;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--white);
  transform: translateX(5px);
}

.page-about .about-rail__link:hover .about-rail__num,
.page-about .about-rail__link:focus-visible .about-rail__num {
  color: var(--yellow);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter + .about-chapter {
  margin-top: clamp(38px, 5.5vw, 76px);
  padding-top: clamp(30px, 4.5vw, 56px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-chapter__tag {
  padding: 3px 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--yellow);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 32px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-chapter__text {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.4vw, 16px);
  line-height: 1.9;
  color: rgba(243, 247, 242, 0.74);
}

/* ---------- 卡片 ---------- */
.page-about .about-cards {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-card {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(158deg, rgba(23, 59, 45, 0.9) 0%, rgba(12, 38, 28, 0.62) 100%);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .about-card::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 0;
  width: 46px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--yellow);
  opacity: 0.8;
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  transform: translateY(-6px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-lift);
}

.page-about .about-card__title {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 247, 242, 0.7);
}

.page-about .about-card__extra {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--yellow);
  opacity: 0.5;
  transition: opacity 0.22s ease;
}

.page-about .about-card:hover .about-card__extra,
.page-about .about-card:focus-within .about-card__extra {
  opacity: 1;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 24px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--green-3);
}

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

/* ---------- 评测要点 ---------- */
.page-about .about-points {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .about-point {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-point:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-point__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-point__title {
  margin: 2px 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-point__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 247, 242, 0.7);
}

/* ---------- 服务刻度带 ---------- */
.page-about .about-scale {
  margin-top: 28px;
  padding: 26px 20px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background:
    linear-gradient(180deg, rgba(155, 220, 232, 0.08) 0%, rgba(8, 26, 19, 0) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), 0 100%);
}

.page-about .about-scale__bar {
  height: 10px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--yellow) 0%, var(--ice) 52%, rgba(155, 220, 232, 0.16) 100%);
}

.page-about .about-scale__marks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scale__mark {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-left: 12px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-scale__value {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .about-scale__label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 标签 ---------- */
.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tag {
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: rgba(23, 59, 45, 0.6);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ice);
}

/* ---------- 版本说明 ---------- */
.page-about .about-notes {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-note {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-note__key {
  min-width: 44px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--yellow);
}

.page-about .about-note__val {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(243, 247, 242, 0.76);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  margin-top: clamp(52px, 8vw, 100px);
}

.page-about .about-next__inner {
  position: relative;
  padding: clamp(28px, 4.5vw, 52px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(135deg, rgba(23, 59, 45, 0.95) 0%, rgba(12, 38, 28, 0.9) 55%, rgba(74, 18, 17, 0.45) 100%);
  overflow: hidden;
}

.page-about .about-next__inner::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(230, 255, 59, 0.16) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.25;
  color: var(--white);
}

.page-about .about-next__text {
  margin: 0 0 22px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 247, 242, 0.76);
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 760px) {
  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-points {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 26px;
  }

  .page-about .about-point {
    border-bottom: none;
    padding-bottom: 0;
  }

  .page-about .about-scale {
    padding: 30px 32px 26px;
  }

  .page-about .about-scale__marks {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 0.66fr) minmax(0, 1.34fr);
    align-items: stretch;
  }

  .page-about .about-hero__visual {
    order: 1;
    aspect-ratio: auto;
    min-height: 360px;
    height: 100%;
    clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  }

  .page-about .about-hero__body {
    order: 2;
    justify-content: center;
    padding: 12px 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 216px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: clamp(20px, 3vw, 40px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-rail__link,
  .page-about .about-card__extra {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-card:focus-within,
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    transform: none;
  }
}