/* ============ 品牌概况页 · 书脊索引 + 灯笼时间轴 ============ */
.page-about {
  --about-line: rgba(43, 29, 22, .12);
  --about-lamp-grad: radial-gradient(circle at 34% 28%, #ffe0ac 0%, var(--ld-gold) 45%, var(--ld-red) 100%);
  background:
    radial-gradient(1000px 420px at 92% -10%, rgba(245, 176, 65, .24), transparent 68%),
    radial-gradient(700px 340px at -8% 14%, rgba(62, 142, 126, .08), transparent 70%),
    var(--ld-cream);
  color: var(--ld-ink);
  font-family: var(--ld-body);
  overflow-x: clip;
}

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

/* —— 面包屑 —— */
.page-about .about-crumb {
  padding-top: 22px;
}

/* —— 首屏 —— */
.page-about .about-hero {
  padding: 26px 0 8px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: center;
}

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

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--ld-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7vw, 4.1rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--ld-indigo);
}

.page-about .about-hero__title em {
  font-style: normal;
  position: relative;
  color: var(--ld-red);
  background-image: linear-gradient(90deg, rgba(245, 176, 65, .55), rgba(255, 140, 66, .35));
  background-repeat: no-repeat;
  background-size: 100% .18em;
  background-position: 0 92%;
}

.page-about .about-hero__lead {
  margin: 20px 0 26px;
  max-width: 34em;
  font-size: 1.01rem;
  line-height: 1.92;
  letter-spacing: .02em;
  color: var(--ld-ink);
}

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

.page-about .about-hero__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero__frame {
  position: relative;
  border-radius: 6px 6px 46px 6px;
  overflow: hidden;
  box-shadow: var(--ld-shadow-lg), 0 0 0 1px rgba(245, 176, 65, .55);
}

.page-about .about-hero__frame img {
  width: 100%;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(202deg, rgba(15, 26, 46, 0) 42%, rgba(15, 26, 46, .58) 100%);
  pointer-events: none;
}

.page-about .about-hero__figure figcaption {
  margin-top: 10px;
}

/* —— 首屏数据条 —— */
.page-about .about-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
  background: rgba(245, 176, 65, .4);
  border: 1px solid rgba(245, 176, 65, .4);
  border-radius: var(--ld-radius);
  overflow: hidden;
}

.page-about .about-facts__item {
  background: var(--ld-indigo);
  padding: 16px 20px;
}

.page-about .about-facts__num {
  display: block;
  font-family: var(--ld-mono);
  font-size: 1.5rem;
  line-height: 1.2;
  letter-spacing: .04em;
  color: var(--ld-gold);
}

.page-about .about-facts__label {
  display: block;
  margin-top: 5px;
  font-size: .82rem;
  line-height: 1.6;
  letter-spacing: .04em;
  color: rgba(255, 249, 240, .78);
}

/* —— 主体两栏：书脊 + 内容流 —— */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding-top: 28px;
  padding-bottom: 44px;
}

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

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

.page-about .about-spine__link {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 8px 0 8px 14px;
  font-size: .88rem;
  line-height: 1.5;
  color: var(--ld-gray);
  text-decoration: none;
  border-left: 2px solid var(--about-line);
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .about-spine__link:hover,
.page-about .about-spine__link:focus-visible {
  color: var(--ld-red);
  border-left-color: var(--ld-red);
  background: rgba(245, 176, 65, .18);
}

.page-about .about-spine__no {
  font-family: var(--ld-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--ld-red);
}

.page-about .about-spine__label {
  margin: 0 0 12px;
  font-family: var(--ld-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--ld-gray);
}

.page-about .about-spine__back {
  display: inline-block;
  margin: 18px 0 0 14px;
  font-family: var(--ld-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--ld-gray);
  text-decoration: none;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-spine__back:hover,
.page-about .about-spine__back:focus-visible {
  color: var(--ld-red);
  border-bottom-color: var(--ld-red);
}

/* —— 章节通用 —— */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-sec {
  padding: 34px 0 10px;
  scroll-margin-top: calc(var(--ld-header-h-compact) + 20px);
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--about-line);
}

.page-about .ld-section-title {
  margin: 8px 0 0;
  font-family: var(--ld-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--ld-indigo);
}

.page-about .about-lead {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: .98rem;
  line-height: 1.9;
  letter-spacing: .02em;
  color: var(--ld-ink);
}

.page-about .about-p {
  margin: 13px 0 0;
  max-width: 40em;
  font-size: .96rem;
  line-height: 1.92;
  letter-spacing: .02em;
  color: var(--ld-ink);
}

.page-about .about-quote {
  margin: 24px 0 0;
  padding: 20px 22px;
  border-left: 4px solid var(--ld-red);
  border-radius: 0 var(--ld-radius) var(--ld-radius) 0;
  background: linear-gradient(100deg, rgba(246, 227, 197, .92), rgba(251, 243, 228, .5));
  font-family: var(--ld-display);
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--ld-indigo);
}

/* —— 灯笼时间轴 —— */
.page-about .about-timeline {
  position: relative;
  margin: 26px 0 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--ld-gold), rgba(192, 57, 43, .55) 58%, rgba(27, 42, 74, .28));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__lamp {
  position: absolute;
  left: -34px;
  top: 10px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--about-lamp-grad);
  box-shadow: 0 0 0 4px rgba(245, 176, 65, .18), 0 0 18px rgba(255, 140, 66, .7);
}

.page-about .about-timeline__card {
  padding: 16px 18px 18px;
  border: 1px solid var(--about-line);
  border-radius: var(--ld-radius);
  background: var(--ld-wick);
  box-shadow: 0 10px 26px rgba(43, 29, 22, .07);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--ld-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--ld-red);
}

.page-about .about-timeline__card h3 {
  margin: 6px 0 8px;
  font-family: var(--ld-display);
  font-weight: 700;
  font-size: 1.18rem;
  line-height: 1.4;
  color: var(--ld-indigo);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  letter-spacing: .02em;
  color: var(--ld-gray);
}

/* —— 档案墙配图 —— */
.page-about .about-archive {
  margin: 28px 0 0;
}

.page-about .about-archive img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--ld-radius);
  box-shadow: var(--ld-shadow), 0 0 0 1px rgba(245, 176, 65, .42);
}

.page-about .about-archive figcaption {
  margin-top: 10px;
}

/* —— 团队分工 —— */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-team__card {
  border: 1px solid var(--about-line);
  border-radius: var(--ld-radius);
  background: var(--ld-wick);
  overflow: hidden;
  transition: border-color .22s ease, box-shadow .22s ease;
}

.page-about .about-team__card:hover {
  border-color: rgba(245, 176, 65, .8);
  box-shadow: 0 8px 22px rgba(43, 29, 22, .08);
}

.page-about .about-team__card summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-team__card summary:focus-visible {
  outline: 2px solid var(--ld-orange);
  outline-offset: -3px;
}

.page-about .about-team__num {
  font-family: var(--ld-mono);
  font-size: 1.45rem;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--ld-red);
}

.page-about .about-team__name {
  font-family: var(--ld-display);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--ld-indigo);
}

.page-about .about-team__chev {
  font-family: var(--ld-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--ld-jade);
  transition: transform .25s ease;
}

.page-about .about-team__card[open] .about-team__chev {
  transform: rotate(45deg);
}

.page-about .about-team__body {
  margin: 0;
  padding: 0 16px 16px 46px;
  font-size: .88rem;
  line-height: 1.85;
  letter-spacing: .02em;
  color: var(--ld-gray);
}

/* —— 内容工序 —— */
.page-about .about-method {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}

.page-about .about-method__col {
  padding: 20px 20px 22px;
  border-radius: var(--ld-radius);
  border: 1px solid var(--about-line);
  background: var(--ld-wick);
}

.page-about .about-method__col--dark {
  border-color: rgba(245, 176, 65, .35);
  background: var(--ld-indigo);
  color: var(--ld-wick);
}

.page-about .about-method__title {
  margin: 0 0 14px;
  font-family: var(--ld-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--ld-red);
}

.page-about .about-method__col--dark .about-method__title {
  color: var(--ld-gold);
}

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

.page-about .about-method__list li {
  display: grid;
  grid-template-columns: 8px 1fr;
  gap: 10px;
  padding: 9px 0;
  font-size: .92rem;
  line-height: 1.8;
  letter-spacing: .02em;
  color: var(--ld-ink);
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-method__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-method__dot {
  width: 8px;
  height: 8px;
  margin-top: .62em;
  border-radius: 50%;
  background: var(--about-lamp-grad);
  box-shadow: 0 0 8px rgba(255, 140, 66, .65);
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: about-step;
}

.page-about .about-steps li {
  position: relative;
  padding: 10px 0 10px 34px;
  font-size: .9rem;
  line-height: 1.8;
  letter-spacing: .02em;
  color: rgba(255, 249, 240, .82);
  border-bottom: 1px solid rgba(245, 176, 65, .18);
  counter-increment: about-step;
}

.page-about .about-steps li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-steps li::before {
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 11px;
  font-family: var(--ld-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--ld-gold);
}

.page-about .about-steps strong {
  display: block;
  font-family: var(--ld-display);
  font-weight: 700;
  font-size: .98rem;
  color: var(--ld-wick);
}

.page-about .about-desk {
  margin: 20px 0 0;
}

.page-about .about-desk img {
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: var(--ld-radius);
  box-shadow: var(--ld-shadow), 0 0 0 1px rgba(245, 176, 65, .42);
}

.page-about .about-desk figcaption {
  margin-top: 10px;
}

/* —— 基地面板 —— */
.page-about .about-base__panel {
  margin-top: 22px;
  padding: 24px 20px;
  border-radius: var(--ld-radius);
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-base__title {
  margin: 0 0 12px;
  font-family: var(--ld-display);
  font-weight: 700;
  font-size: 1.16rem;
  line-height: 1.45;
  color: var(--ld-wick);
}

.page-about .about-base__text {
  margin: 0 0 14px;
  font-size: .92rem;
  line-height: 1.88;
  letter-spacing: .02em;
  color: rgba(255, 249, 240, .8);
}

.page-about .about-base__addr {
  margin: 0 0 14px;
  padding: 12px 14px;
  border-left: 3px solid var(--ld-gold);
  border-radius: 0 8px 8px 0;
  background: rgba(255, 249, 240, .06);
  font-family: var(--ld-mono);
  font-size: .8rem;
  line-height: 1.85;
  letter-spacing: .04em;
  color: var(--ld-gold);
}

.page-about .about-base__btn {
  margin-top: 4px;
}

.page-about .about-base__stats {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-base__stat {
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(245, 176, 65, .2);
}

.page-about .about-base__stat:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-base__stat dt {
  font-family: var(--ld-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--ld-gold);
}

.page-about .about-base__stat dd {
  margin: 6px 0 0;
  font-size: .9rem;
  line-height: 1.8;
  letter-spacing: .02em;
  color: rgba(255, 249, 240, .86);
}

/* —— 伙伴 —— */
.page-about .about-partners {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-partners__item {
  padding: 16px 14px 18px;
  border: 1px solid var(--about-line);
  border-radius: var(--ld-radius);
  background: var(--ld-wick);
  transition: transform .25s ease, border-color .25s ease;
}

.page-about .about-partners__item:hover {
  transform: translateY(-3px);
  border-color: rgba(62, 142, 126, .6);
}

.page-about .about-partners__num {
  font-family: var(--ld-mono);
  font-size: 1.55rem;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--ld-jade);
}

.page-about .about-partners__name {
  margin: 10px 0 0;
  font-family: var(--ld-display);
  font-weight: 700;
  font-size: .95rem;
  color: var(--ld-indigo);
}

.page-about .about-partners__desc {
  margin: 6px 0 0;
  font-size: .8rem;
  line-height: 1.75;
  letter-spacing: .02em;
  color: var(--ld-gray);
}

/* —— 荣誉印章 —— */
.page-about .about-honor {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: center;
  margin-top: 22px;
}

.page-about .about-honor__seal {
  width: 124px;
  height: 124px;
  display: grid;
  place-content: center;
  text-align: center;
  border: 2px solid var(--ld-red);
  border-radius: 50%;
  color: var(--ld-red);
  background: radial-gradient(circle at 50% 38%, rgba(245, 176, 65, .3), transparent 72%);
  box-shadow: inset 0 0 0 6px rgba(192, 57, 43, .1);
  transition: box-shadow .3s ease, transform .3s ease;
}

.page-about .about-honor__seal:hover {
  transform: rotate(-4deg);
  box-shadow: inset 0 0 0 6px rgba(192, 57, 43, .16), 0 0 0 6px rgba(245, 176, 65, .22);
}

.page-about .about-honor__num {
  display: block;
  font-family: var(--ld-display);
  font-weight: 900;
  font-size: 2.3rem;
  line-height: 1;
}

.page-about .about-honor__txt {
  display: block;
  margin-top: 4px;
  font-family: var(--ld-mono);
  font-size: .68rem;
  letter-spacing: .18em;
}

/* —— 收束区 —— */
.page-about .about-cta {
  position: relative;
  padding: 48px 0 52px;
  background: var(--ld-night);
  color: var(--ld-wick);
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: -8%;
  top: -46%;
  width: 460px;
  height: 380px;
  background: radial-gradient(circle, rgba(255, 140, 66, .34), transparent 66%);
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  display: grid;
  gap: 16px;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--ld-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 4.2vw, 2.1rem);
  line-height: 1.32;
  color: var(--ld-wick);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 38em;
  font-size: .94rem;
  line-height: 1.9;
  letter-spacing: .02em;
  color: rgba(255, 249, 240, .8);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* —— 中等宽度 —— */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-honor {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 32px;
  }
}

/* —— 桌面 —— */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 12px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.06fr .94fr;
    gap: 48px;
  }

  .page-about .about-hero__lead {
    font-size: 1.06rem;
  }

  .page-about .about-base__panel {
    grid-template-columns: 1.12fr .88fr;
    gap: 40px;
    padding: 36px 34px;
  }

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

  .page-about .about-timeline__card {
    padding: 20px 22px 22px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 60px;
    padding-top: 52px;
    padding-bottom: 64px;
  }

  .page-about .about-spine {
    display: block;
    position: sticky;
    top: calc(var(--ld-header-h-compact) + 20px);
    align-self: start;
    padding-right: 8px;
  }

  .page-about .about-sec {
    padding: 40px 0 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-spine__link,
  .page-about .about-team__chev,
  .page-about .about-team__card,
  .page-about .about-partners__item,
  .page-about .about-honor__seal {
    transition: none;
  }

  .page-about .about-partners__item:hover,
  .page-about .about-honor__seal:hover {
    transform: none;
  }
}