.page-about {
  --rail-w: 236px;
  padding-bottom: clamp(56px, 8vw, 104px);
  color: var(--text);
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 2.5vw, 24px);
}

/* 首屏框景 */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(14px, 2.5vw, 24px);
  padding: clamp(22px, 4vw, 44px);
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(110% 80% at 88% -10%, rgba(217, 164, 65, 0.18), transparent 62%),
    radial-gradient(85% 70% at 0% 100%, rgba(127, 169, 155, 0.16), transparent 68%),
    linear-gradient(160deg, var(--ink-deep) 0%, var(--ink) 58%, var(--celadon-deep) 100%);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--amber), var(--cinnabar) 42%, transparent 88%);
  opacity: 0.85;
}

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

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.75rem, 6.2vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.9;
  color: var(--text-soft);
}

.page-about .about-hero__stats {
  margin-top: clamp(22px, 4vw, 34px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .about-stat {
  padding-left: 12px;
  border-left: 2px solid var(--amber);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-2);
}

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

/* 侧边导览 + 正文 */
.page-about .about-layout {
  margin-top: clamp(30px, 5vw, 56px);
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-rail {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(15, 59, 58, 0.72), rgba(11, 27, 43, 0.6));
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--celadon);
}

.page-about .about-rail__list {
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  white-space: nowrap;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: var(--fs-14);
  color: var(--text-soft);
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--amber);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-color: var(--amber);
  background: rgba(217, 164, 65, 0.12);
}

.page-about .about-rail__seal {
  display: none;
}

/* 章节通用 */
.page-about .about-section {
  padding-block: clamp(26px, 4.5vw, 52px);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-section__index {
  flex: none;
  font-size: var(--fs-14);
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-section__grid {
  margin-top: clamp(14px, 2.5vw, 22px);
  display: grid;
  gap: 20px;
}

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

.page-about .about-section__text p {
  margin: 0 0 1em;
  color: var(--text-soft);
}

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

.page-about .about-note {
  padding: 18px 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  border-left: 3px solid var(--celadon);
  background: rgba(15, 59, 58, 0.5);
}

.page-about .about-note__label {
  margin: 0 0 8px;
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--celadon);
}

.page-about .about-note__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--text-soft);
}

/* 浅色纸卡面板 */
.page-about .about-panel {
  padding: clamp(20px, 4vw, 40px);
  border-radius: var(--radius-lg);
  background: linear-gradient(170deg, var(--paper), var(--parchment));
  color: var(--ink-text);
  box-shadow: var(--shadow-1);
}

.page-about .about-panel--parchment {
  background: linear-gradient(165deg, var(--parchment), #EADFCC);
}

.page-about .about-panel .section-title {
  color: var(--ink-text);
}

.page-about .about-panel .about-section__index {
  color: var(--wine);
}

.page-about .about-panel__lead {
  margin: 16px 0 0;
  max-width: 40em;
  color: var(--ink-text-soft);
}

.page-about .about-panel__figure {
  margin-top: clamp(20px, 3.5vw, 30px);
}

.page-about .about-panel__foot {
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--ink-text-soft);
}

.page-about .about-inline-link {
  color: var(--wine);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 标签矩阵 */
.page-about .about-tag-groups {
  margin-top: clamp(18px, 3vw, 26px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-tag-group {
  padding: 16px 16px 18px;
  border: 1px solid rgba(18, 32, 46, 0.16);
  border-radius: var(--radius-md);
  background: rgba(255, 248, 238, 0.72);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-tag-group:hover,
.page-about .about-tag-group:focus-within {
  transform: translateY(-3px);
  border-color: rgba(15, 59, 58, 0.45);
  box-shadow: 0 14px 30px rgba(3, 9, 16, 0.14);
}

.page-about .about-tag-group__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-tag-group__count {
  font-size: var(--fs-32);
  font-weight: 700;
  line-height: 1;
  color: var(--celadon-deep);
}

.page-about .about-tag-group__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-18);
  color: var(--ink-text);
}

.page-about .about-tag-group__desc {
  margin: 10px 0 12px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-text-soft);
}

.page-about .about-panel .chip {
  border-color: rgba(15, 59, 58, 0.28);
  color: var(--celadon-deep);
  background: rgba(127, 169, 155, 0.22);
}

.page-about .about-panel .chip--amber {
  border-color: rgba(163, 116, 26, 0.45);
  color: #6B4A0C;
  background: rgba(217, 164, 65, 0.26);
}

.page-about .about-panel .chip--red {
  border-color: rgba(195, 74, 54, 0.42);
  color: var(--wine);
  background: rgba(195, 74, 54, 0.16);
}

/* 表格 */
.page-about .about-table {
  margin-top: clamp(16px, 3vw, 24px);
  width: 100%;
}

.page-about .about-table th[scope="row"] {
  text-align: left;
  white-space: nowrap;
}

/* 时间轴 */
.page-about .about-timeline {
  padding: clamp(20px, 4vw, 38px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(90% 70% at 100% 0%, rgba(195, 74, 54, 0.16), transparent 60%),
    linear-gradient(155deg, var(--celadon-deep), var(--ink));
}

.page-about .about-timeline__lead {
  margin: 14px 0 0;
  max-width: 38em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-timeline__track {
  margin-top: clamp(20px, 3.5vw, 30px);
  display: grid;
  gap: 10px;
}

.page-about .about-stage {
  position: relative;
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255, 248, 238, 0.04);
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-stage:hover,
.page-about .about-stage:focus-visible {
  background: rgba(217, 164, 65, 0.14);
  border-color: rgba(217, 164, 65, 0.5);
  transform: translateY(-3px);
}

.page-about .about-stage__marker {
  display: block;
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-stage__name {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-18);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-stage__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .about-timeline__figure {
  margin: clamp(20px, 3.5vw, 30px) 0 0;
}

/* 服务 */
.page-about .about-service-grid {
  margin-top: clamp(18px, 3vw, 26px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-service-item {
  padding: 16px 18px 18px;
  border-left: 3px solid var(--amber);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(255, 248, 238, 0.55);
}

.page-about .about-service-item__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-18);
  color: var(--ink-text);
}

.page-about .about-service-item__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--ink-text-soft);
}

/* 下一步 */
.page-about .about-next {
  margin-top: clamp(16px, 3vw, 24px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-next__card {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 18px 44px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(15, 59, 58, 0.4);
  text-decoration: none;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--amber);
  background: rgba(217, 164, 65, 0.12);
}

.page-about .about-next__label {
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--celadon);
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-size: var(--fs-18);
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-next__arrow {
  position: absolute;
  top: 18px;
  right: 18px;
  font-family: var(--font-mono);
  color: var(--amber);
}

/* 焦点与动效 */
.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

/* 平板及以上 */
@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-section__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.9fr);
    align-items: start;
    gap: 28px;
  }

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

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

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

/* 桌面端侧边导览 */
@media (min-width: 1000px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
  }

  .page-about .about-layout {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
  }

  .page-about .about-rail__link {
    white-space: normal;
    border-color: transparent;
    border-radius: var(--radius-sm);
    padding: 9px 12px;
  }

  .page-about .about-rail__seal {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px dashed var(--line-strong);
  }

  .page-about .about-rail__seal-mark {
    flex: none;
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(195, 74, 54, 0.6);
    font-family: var(--font-display);
    font-size: var(--fs-18);
    color: var(--cinnabar);
  }

  .page-about .about-rail__seal-text {
    font-size: var(--fs-12);
    line-height: 1.6;
    color: var(--text-dim);
  }

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

  .page-about .about-timeline__track {
    position: relative;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
    padding-top: 18px;
  }

  .page-about .about-timeline__track::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--amber), rgba(127, 169, 155, 0.6));
  }

  .page-about .about-stage::before {
    content: "";
    position: absolute;
    top: -22px;
    left: 16px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--amber);
    box-shadow: 0 0 0 3px rgba(217, 164, 65, 0.22);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tag-group,
  .page-about .about-stage,
  .page-about .about-next__card,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-tag-group:hover,
  .page-about .about-tag-group:focus-within,
  .page-about .about-stage:hover,
  .page-about .about-stage:focus-visible,
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}