.page-about {
  --about-rail: 172px;
  --about-hair: rgba(20, 17, 14, .12);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 52px);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(165deg, var(--felt-2) 0%, var(--felt) 52%, var(--felt-deep) 100%);
  color: var(--paper);
  padding-block: clamp(26px, 5vw, 48px) clamp(46px, 8.5vw, 96px);
}

.page-about .about-hero__glow {
  position: absolute;
  top: -32%;
  right: -18%;
  width: min(80vw, 780px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(201, 162, 74, .26), rgba(201, 162, 74, 0) 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__plate {
  position: absolute;
  right: -10%;
  bottom: -16%;
  width: min(72vw, 700px);
  aspect-ratio: 1;
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 72%);
  background: linear-gradient(150deg, rgba(201, 162, 74, .17), rgba(179, 58, 46, .11) 58%, rgba(14, 43, 34, 0) 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(244, 239, 228, .055) 0 1px, transparent 1px 96px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 78%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
}

.page-about .about-hero__crumbs,
.page-about .about-hero__crumbs li,
.page-about .about-hero__crumbs a {
  color: rgba(244, 239, 228, .6);
}

.page-about .about-hero__crumbs a:hover {
  color: var(--gold-hi);
}

.page-about .about-hero__kicker {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--gold);
  flex: none;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 7vw, 4.1rem);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--paper);
  max-width: 24ch;
}

.page-about .about-hero__title span {
  color: var(--gold-hi);
}

.page-about .about-hero__lede {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__lede p {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(1rem, 2vw, 1.12rem);
  line-height: 1.9;
  color: rgba(244, 239, 228, .82);
}

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

.page-about .about-hero__aside {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid var(--gold-dim);
  font-family: var(--f-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: rgba(201, 162, 74, .78);
  max-width: 34ch;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, .82fr);
    column-gap: clamp(32px, 5vw, 76px);
    row-gap: clamp(20px, 3vw, 34px);
    align-items: end;
  }

  .page-about .about-hero__crumbs,
  .page-about .about-hero__kicker,
  .page-about .about-hero__aside {
    grid-column: 1 / -1;
  }

  .page-about .about-hero__title {
    grid-column: 1;
  }

  .page-about .about-hero__lede {
    grid-column: 2;
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  padding-block: clamp(36px, 6vw, 84px);
}

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

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }
}

/* ---------- 左侧索引 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: .68rem;
  letter-spacing: .3em;
  color: var(--clay);
}

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

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--about-hair);
  border-radius: var(--r-pill);
  color: var(--stone);
  text-decoration: none;
  font-size: .84rem;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--felt);
  border-color: var(--gold);
  background: rgba(201, 162, 74, .1);
}

.page-about .about-rail__list .num {
  font-family: var(--f-mono);
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--gold);
}

@media (min-width: 980px) {
  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
    border-left: 1px dashed var(--gold-dim);
  }

  .page-about .about-rail__list a {
    border: 0;
    border-radius: 0;
    padding: 8px 10px;
    font-size: .86rem;
    background: none;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border: 0;
    background: rgba(201, 162, 74, .13);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-block: clamp(30px, 5vw, 60px);
}

.page-about .about-sec::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: clamp(22px, 3.5vw, 38px);
  background: repeating-linear-gradient(90deg, var(--gold-dim) 0 7px, transparent 7px 16px);
}

.page-about .about-sec .section-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-sec .section-num {
  margin: 0;
  font-family: var(--f-mono);
  font-size: .78rem;
  letter-spacing: .24em;
  color: var(--clay);
}

.page-about .about-sec .section-title {
  margin: 0;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--felt);
}

.page-about .about-sec .section-note {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--stone);
  max-width: 46ch;
}

.page-about .about-lead {
  margin: 0 0 clamp(18px, 3vw, 26px);
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(20, 17, 14, .84);
  max-width: 62ch;
}

/* ---------- 01 品牌起点 ---------- */
.page-about .about-cols {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-cols__main p {
  margin: 0 0 1.05em;
  line-height: 1.9;
  color: rgba(20, 17, 14, .84);
}

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

.page-about .about-cols__side {
  display: grid;
  gap: 12px;
  align-content: start;
}

@media (min-width: 820px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .fact-card {
  padding: 16px 18px;
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: linear-gradient(120deg, rgba(201, 162, 74, .1), rgba(21, 68, 56, .04));
}

.page-about .fact-card__label {
  margin: 0 0 6px;
  font-family: var(--f-mono);
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--stone);
}

.page-about .fact-card__value {
  margin: 0;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1.2;
  color: var(--felt);
}

.page-about .fact-card__value .num {
  font-family: var(--f-mono);
  color: var(--clay);
}

.page-about .fact-card__desc {
  margin: 6px 0 0;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 02 人群 ---------- */
.page-about .about-crowd {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-crowd__list {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .habit-card {
  position: relative;
  padding: 18px 20px 18px 24px;
  border: 1px solid var(--about-hair);
  border-radius: var(--r-md);
  background: linear-gradient(120deg, rgba(21, 68, 56, .075), rgba(201, 162, 74, .06));
}

.page-about .habit-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--gold), rgba(201, 162, 74, 0));
}

.page-about .habit-card__idx {
  margin: 0 0 6px;
  font-family: var(--f-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .habit-card h3 {
  margin: 0 0 8px;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.5;
  color: var(--felt);
}

.page-about .habit-card p:last-child {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: rgba(20, 17, 14, .8);
}

@media (min-width: 900px) {
  .page-about .about-crowd {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .about-crowd__fig {
    position: sticky;
    top: 100px;
  }
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(20px, 3vw, 30px);
}

.page-about .about-figure__box {
  overflow: hidden;
  border-radius: var(--r-md);
  border: 1px solid rgba(201, 162, 74, .26);
}

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

.page-about .about-figure__box--4x3 { aspect-ratio: 4 / 3; }
.page-about .about-figure__box--wide { aspect-ratio: 15 / 8; }
.page-about .about-figure__box--3x2 { aspect-ratio: 3 / 2; }

.page-about .about-figure .img-frame__caption {
  margin-top: 10px;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-sec--dark .about-figure .img-frame__caption,
.page-about .about-sec--team .about-figure .img-frame__caption {
  color: rgba(244, 239, 228, .56);
}

.page-about .about-figure--flow {
  margin-top: clamp(22px, 3.5vw, 34px);
}

/* ---------- 深色面板（03 / 05） ---------- */
.page-about .about-sec--dark,
.page-about .about-sec--team {
  border-radius: var(--r-lg);
  padding: clamp(26px, 4vw, 52px) clamp(18px, 3.4vw, 44px) clamp(30px, 5vw, 56px);
  color: var(--paper);
  box-shadow: 0 26px 64px -44px rgba(8, 29, 23, .95);
}

.page-about .about-sec--dark {
  background:
    radial-gradient(90% 70% at 12% 0%, rgba(201, 162, 74, .15), transparent 60%),
    linear-gradient(158deg, var(--felt-2), var(--felt) 58%, var(--felt-deep));
}

.page-about .about-sec--team {
  background:
    radial-gradient(80% 62% at 88% 100%, rgba(179, 58, 46, .16), transparent 62%),
    linear-gradient(160deg, var(--felt-2), var(--felt) 62%, var(--felt-deep));
}

.page-about .about-sec--dark .section-title,
.page-about .about-sec--team .section-title {
  color: var(--paper);
}

.page-about .about-sec--dark .section-num,
.page-about .about-sec--team .section-num {
  color: var(--gold);
}

.page-about .about-sec--dark .section-note,
.page-about .about-sec--team .section-note {
  color: rgba(244, 239, 228, .64);
}

.page-about .about-sec--dark::before,
.page-about .about-sec--team::before {
  opacity: .6;
}

/* ---------- 03 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  display: flex;
  gap: clamp(14px, 2vw, 22px);
  margin: 0;
  padding: 0 0 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-color: var(--gold-dim) transparent;
}

.page-about .timeline__node {
  position: relative;
  flex: 0 0 min(272px, 76vw);
  scroll-snap-align: start;
  padding: 32px 18px 18px;
  border-top: 1px solid rgba(201, 162, 74, .34);
  border-radius: 0 0 var(--r-md) var(--r-md);
  background: linear-gradient(180deg, rgba(244, 239, 228, .05), rgba(244, 239, 228, 0));
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 18px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 74, .16);
}

.page-about .timeline__node--major::before {
  top: -9px;
  width: 17px;
  height: 17px;
  background: var(--gold-hi);
  box-shadow: 0 0 0 5px rgba(201, 162, 74, .22), 0 0 20px rgba(201, 162, 74, .5);
}

.page-about .timeline__when {
  margin: 0 0 6px;
  font-family: var(--f-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .timeline__desc {
  margin: 0;
  font-size: .87rem;
  line-height: 1.8;
  color: rgba(244, 239, 228, .68);
}

/* ---------- 04 流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flow__item {
  position: relative;
  padding-left: 40px;
}

.page-about .flow__item::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-dim), rgba(201, 162, 74, .08));
}

.page-about .flow__item:last-child::before {
  bottom: auto;
  height: 28px;
}

.page-about .flow__item::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 24px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--gold);
}

.page-about .flow__step {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .flow__sum {
  position: relative;
  display: grid;
  gap: 5px;
  padding: 18px 34px 18px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .flow__sum::-webkit-details-marker {
  display: none;
}

.page-about .flow__sum::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 28px;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--clay);
  border-bottom: 1.5px solid var(--clay);
  transform: rotate(45deg);
  transition: transform .28s var(--ease);
}

.page-about .flow__step[open] .flow__sum::after {
  transform: rotate(-135deg);
}

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

.page-about .flow__num {
  font-family: var(--f-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--gold);
  flex: none;
}

.page-about .flow__title {
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.4;
  color: var(--felt);
}

.page-about .flow__line {
  font-size: .85rem;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .flow__body {
  padding: 0 34px 20px 0;
}

.page-about .flow__body p {
  margin: 0;
  max-width: 62ch;
  font-size: .93rem;
  line-height: 1.9;
  color: rgba(20, 17, 14, .82);
}

/* ---------- 05 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  padding: 20px 20px 22px;
  border: 1px solid rgba(201, 162, 74, .26);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(244, 239, 228, .11), rgba(244, 239, 228, .03));
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: transform .26s var(--ease), border-color .26s var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-3px);
  border-color: rgba(201, 162, 74, .6);
}

.page-about .team-card__label {
  margin: 0 0 8px;
  font-family: var(--f-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  color: var(--gold);
}

.page-about .team-card__title {
  margin: 0 0 10px;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 1.16rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .team-card__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.88;
  color: rgba(244, 239, 228, .72);
}

.page-about .team-card__list {
  list-style: none;
  display: grid;
  gap: 7px;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed rgba(201, 162, 74, .24);
}

.page-about .team-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: .83rem;
  line-height: 1.7;
  color: rgba(244, 239, 228, .6);
}

.page-about .team-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .team-sync {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(201, 162, 74, .26);
  font-size: .9rem;
  line-height: 1.85;
  color: rgba(244, 239, 228, .68);
  max-width: 74ch;
}

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: 1.14fr 1fr .86fr;
    gap: 16px;
    align-items: start;
  }

  .page-about .team-card:nth-child(2) { margin-top: 22px; }
  .page-about .team-card:nth-child(3) { margin-top: 44px; }
}

/* ---------- 06 规模 ---------- */
.page-about .stat-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.page-about .stat {
  padding: 18px 18px 16px;
  border-top: 2px solid var(--gold);
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  background: linear-gradient(180deg, rgba(201, 162, 74, .1), rgba(201, 162, 74, 0));
}

.page-about .stat__value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
  font-family: var(--f-mono);
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--felt);
  font-variant-numeric: tabular-nums;
}

.page-about .stat__unit {
  font-family: var(--f-body);
  font-size: .9rem;
  letter-spacing: 0;
  color: var(--clay);
}

.page-about .stat__label {
  margin: 10px 0 0;
  font-size: .92rem;
  font-weight: 500;
  color: var(--ink);
}

.page-about .stat__desc {
  margin: 4px 0 0;
  font-size: .81rem;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-close {
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--cinnabar);
  font-size: .98rem;
  line-height: 1.9;
  color: rgba(20, 17, 14, .84);
  max-width: 66ch;
}

.page-about .about-next {
  display: grid;
  gap: 12px;
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .about-next__card {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border: 1px solid var(--about-hair);
  border-radius: var(--r-md);
  text-decoration: none;
  background: linear-gradient(135deg, rgba(201, 162, 74, .09), rgba(21, 68, 56, .05));
  transition: transform .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--gold);
  box-shadow: 0 18px 36px -26px rgba(14, 43, 34, .75);
}

.page-about .about-next__label {
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 1.04rem;
  color: var(--felt);
}

.page-about .about-next__desc {
  font-size: .85rem;
  line-height: 1.7;
  color: var(--stone);
}

@media (min-width: 760px) {
  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .about-next__card,
  .page-about .flow__sum::after {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}