.page-about {
  --about-index-w: 152px;
  --about-gold-ink: #8A6410;
  --about-rhythm: clamp(72px, 9vw, 128px);
  --about-rhythm-tight: clamp(52px, 6.5vw, 92px);
  background: var(--sand);
  color: var(--ink);
}

/* ---------- 首屏说明区 ---------- */

.page-about .about-intro {
  padding-block: clamp(18px, 3vw, 34px) clamp(40px, 6vw, 76px);
}

.page-about .about-intro .eyebrow {
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 6vw, 4.6rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--deep);
}

.page-about .about-h1::after {
  content: "";
  display: block;
  width: clamp(76px, 12vw, 168px);
  height: 6px;
  margin-top: 22px;
  background: linear-gradient(90deg, var(--gold), var(--gold-soft) 72%, transparent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.page-about .about-lede {
  max-width: 64ch;
  margin: 26px 0 0;
  font-size: clamp(1.02rem, 1.5vw, 1.14rem);
  line-height: 1.92;
  color: var(--slate);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.page-about .about-fact {
  padding: 16px 18px 18px;
  background: var(--linen);
}

.page-about .about-fact dt {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .about-fact dd {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.8vw, 1.28rem);
  font-weight: 700;
  color: var(--deep);
}

/* ---------- 主体骨架：编号轨道 + 正文 ---------- */

.page-about .about-frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-block-end: clamp(64px, 9vw, 120px);
}

.page-about .about-index ol {
  display: flex;
  gap: 8px;
  margin: 0 0 clamp(26px, 4vw, 44px);
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-index li {
  flex: none;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--linen);
  font-size: 0.83rem;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--slate);
  text-decoration: none;
  transition: color 180ms ease-out, border-color 180ms ease-out, background-color 180ms ease-out;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--deep);
  border-color: var(--line-gold);
  background: rgba(212, 160, 23, 0.1);
}

.page-about .about-index__num {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--about-gold-ink);
}

@media (min-width: 1000px) {
  .page-about .about-frame {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    column-gap: clamp(40px, 5vw, 84px);
  }

  .page-about .about-index {
    align-self: start;
    position: sticky;
    top: calc(var(--masthead-h) + 34px);
  }

  .page-about .about-index ol {
    display: block;
    margin: 0;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index li {
    display: block;
  }

  .page-about .about-index a {
    display: flex;
    padding: 11px 12px 11px 16px;
    border: 0;
    border-radius: 0 6px 6px 0;
    background: transparent;
    white-space: normal;
    line-height: 1.55;
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    background: rgba(212, 160, 23, 0.12);
  }
}

/* ---------- 章节节奏 ---------- */

.page-about .about-body > .about-section + .about-section {
  margin-top: var(--about-rhythm);
}

.page-about .about-body > .about-section:nth-child(even) + .about-section {
  margin-top: var(--about-rhythm-tight);
}

.page-about .about-section__head {
  position: relative;
  max-width: 66ch;
  margin-bottom: clamp(26px, 3.6vw, 46px);
  padding-top: 20px;
}

.page-about .about-section__head::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 62px;
  height: 3px;
  background: var(--gold);
  clip-path: polygon(0 0, 100% 0, calc(100% - 9px) 100%, 0 100%);
}

.page-about .about-section__num {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--about-gold-ink);
}

.page-about .about-section__head .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  color: var(--deep);
  letter-spacing: -0.01em;
}

.page-about .about-section__lede {
  margin: 14px 0 0;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--slate);
}

/* ---------- 图版通用 ---------- */

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure .figure__frame {
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--deep);
}

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

.page-about .about-figure--wide .figure__frame {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure--square .figure__frame {
  aspect-ratio: 1 / 1;
}

.page-about .about-figure--panel .figure__frame {
  aspect-ratio: 3 / 2;
  border-color: rgba(245, 239, 230, 0.16);
}

.page-about .about-figure .figure__cap {
  margin-top: 12px;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 01 沿革时间线 ---------- */

.page-about .about-timeline {
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 4px 4px 18px;
  list-style: none;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .about-node {
  position: relative;
  flex: 0 0 min(80vw, 318px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 20px 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--linen);
  transition: border-color 200ms ease-out, box-shadow 200ms ease-out;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  width: 42px;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold-soft));
}

.page-about .about-node:hover {
  border-color: var(--line-gold);
  box-shadow: 0 8px 22px rgba(11, 42, 74, 0.08);
}

.page-about .about-node__tag {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--about-gold-ink);
}

.page-about .about-node h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--deep);
}

.page-about .about-node p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.86;
  color: var(--slate);
}

.page-about .about-timeline + .about-figure {
  margin-top: clamp(30px, 4vw, 54px);
}

.page-about .about-timeline:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

/* ---------- 02 团队分工 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }
}

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

.page-about .crew {
  padding: 20px 22px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--deep);
  border-radius: 0 8px 8px 0;
  background: var(--linen);
  transition: border-left-color 200ms ease-out, background-color 200ms ease-out, transform 200ms ease-out;
}

.page-about .crew:hover {
  border-left-color: var(--gold);
  background: var(--linen);
  transform: translateX(3px);
}

.page-about .crew h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.14rem;
  color: var(--deep);
}

.page-about .crew p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.86;
  color: var(--slate);
}

.page-about .about-note-bar {
  margin: 20px 0 0;
  padding: 16px 18px;
  border: 1px dashed var(--line-strong);
  border-radius: 8px;
  background: rgba(252, 250, 246, 0.72);
  font-size: 0.93rem;
  line-height: 1.82;
  color: var(--slate);
}

/* ---------- 03 规范体系（深底 + 玻璃层） ---------- */

.page-about .about-rules-panel {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  padding: clamp(20px, 3vw, 38px);
  border-radius: 8px;
  background: linear-gradient(158deg, var(--deep) 0%, var(--night) 100%);
}

@media (min-width: 900px) {
  .page-about .about-rules-panel {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }
}

.page-about .about-rules-panel .figure__cap {
  color: var(--on-dark-soft);
}

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

.page-about .about-rule {
  position: relative;
  padding: 20px 22px 22px;
  border: 1px solid rgba(245, 239, 230, 0.16);
  border-radius: 8px;
  background: var(--glass);
  backdrop-filter: blur(6px);
  transition: border-color 200ms ease-out, background-color 200ms ease-out;
}

.page-about .about-rule:hover,
.page-about .about-rule:focus-within {
  border-color: var(--line-gold);
  background: rgba(252, 250, 246, 0.1);
}

.page-about .about-rule__head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-rule__icon {
  flex: none;
  width: 28px;
  height: 28px;
  color: var(--gold-soft);
}

.page-about .about-rule__head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  color: var(--sand);
}

.page-about .about-rule__cycle {
  margin: 0 0 0 auto;
  padding: 4px 10px;
  border: 1px solid var(--line-gold);
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--gold-soft);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 200ms ease-out, transform 200ms ease-out;
}

.page-about .about-rule:hover .about-rule__cycle,
.page-about .about-rule:focus-within .about-rule__cycle {
  opacity: 1;
  transform: none;
}

@media (hover: none) {
  .page-about .about-rule__cycle {
    opacity: 1;
    transform: none;
  }
}

.page-about .about-rule__body {
  margin: 10px 0 0;
  font-size: 0.94rem;
  line-height: 1.86;
  color: var(--on-dark);
}

.page-about .about-rule__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line-gold);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--sand);
  text-decoration: none;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}

.page-about .about-rule__link:hover,
.page-about .about-rule__link:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

/* ---------- 04 品牌矩阵 ---------- */

.page-about .about-matrix {
  display: grid;
  gap: 16px;
}

@media (min-width: 780px) {
  .page-about .about-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-brand-card {
  padding: 26px 24px 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--linen);
}

.page-about .about-brand-card--alt {
  border-color: rgba(212, 160, 23, 0.34);
  background: linear-gradient(160deg, var(--deep) 0%, var(--night) 78%);
}

.page-about .about-brand-card__tag {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--about-gold-ink);
}

.page-about .about-brand-card--alt .about-brand-card__tag {
  color: var(--gold-soft);
}

.page-about .about-brand-card h3 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--deep);
}

.page-about .about-brand-card--alt h3 {
  color: var(--sand);
}

.page-about .about-brand-card__body {
  margin: 14px 0 0;
  font-size: 0.96rem;
  line-height: 1.88;
  color: var(--slate);
}

.page-about .about-brand-card--alt .about-brand-card__body {
  color: var(--on-dark);
}

.page-about .about-brand-card__list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-brand-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-brand-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-brand-card--alt .about-brand-card__list li {
  color: var(--on-dark);
}

.page-about .about-brand-card--alt .about-brand-card__list li::before {
  background: var(--gold-soft);
}

.page-about .about-matrix__foot {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 68ch;
  padding-left: 18px;
  border-left: 2px solid var(--line-gold);
  font-size: 0.95rem;
  line-height: 1.88;
  color: var(--slate);
}

/* ---------- 05 对外口径边界 ---------- */

.page-about .about-boundary {
  display: grid;
  gap: 16px;
}

@media (min-width: 780px) {
  .page-about .about-boundary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-boundary__col {
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--linen);
}

.page-about .about-boundary__col--out {
  border-style: dashed;
  border-color: var(--line-strong);
  background: var(--linen);
}

.page-about .about-boundary__col h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  color: var(--deep);
}

.page-about .about-boundary__col h3::before {
  content: "";
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--moss);
  transform: rotate(45deg);
}

.page-about .about-boundary__col--out h3::before {
  background: var(--red);
}

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

.page-about .about-boundary__col li {
  position: relative;
  padding-left: 16px;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--slate);
}

.page-about .about-boundary__col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 7px;
  height: 1px;
  background: var(--slate);
}

.page-about .about-close {
  margin-top: clamp(26px, 3.5vw, 42px);
  padding: clamp(20px, 3vw, 30px) clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(120deg, rgba(212, 160, 23, 0.09), rgba(252, 250, 246, 0.9) 62%);
}

.page-about .about-close p {
  max-width: 66ch;
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .about-close__actions {
  margin-top: 18px;
}

.page-about .about-close__actions .btn {
  text-decoration: none;
}

/* ---------- 焦点与动效降级 ---------- */

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew,
  .page-about .about-node,
  .page-about .about-rule,
  .page-about .about-rule__cycle,
  .page-about .about-index a,
  .page-about .about-rule__link {
    transition: none;
  }

  .page-about .crew:hover {
    transform: none;
  }

  .page-about .about-rule__cycle {
    opacity: 1;
    transform: none;
  }
}