/* ===== 品牌故事页专属样式 · page-about ===== */
.page-about{
  --about-rail-w: 248px;
  background: var(--c-cream);
  color: var(--c-ink);
}

.page-about .about-layout{
  max-width: 1440px;
  margin: 0 auto;
  padding: 0;
}

/* ===== 左侧固定章节目录（移动端为横向吸顶） ===== */
.page-about .about-rail{
  position: sticky;
  top: var(--header-h);
  z-index: 30;
  margin: 0 -20px 20px;
  padding: 12px 20px;
  background: var(--c-navy);
  border-bottom: 2px solid var(--c-orange);
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--c-orange) transparent;
}
.page-about .about-rail__inner{
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: max-content;
}
.page-about .about-rail__kicker{
  display: none;
}
.page-about .about-rail__nav{
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .about-rail__link{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.24);
  background: rgba(255,255,255,0.06);
  color: var(--c-white);
  font-family: var(--ff-heading);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.page-about .about-rail__link:hover{
  background: rgba(255,107,53,0.18);
  border-color: var(--c-orange);
}
.page-about .about-rail__no{
  color: var(--c-orange);
  font-family: var(--ff-mono);
  font-size: 12px;
}
.page-about .about-rail__footer{
  display: none;
}
.page-about .about-rail__note{
  display: none;
}

/* ===== 正文主体 ===== */
.page-about .about-body{
  min-width: 0;
}
.page-about .about-section{
  position: relative;
  padding: 44px 20px 40px;
  scroll-margin-top: calc(var(--header-h) + 10px);
}
.page-about .about-section--brand{
  background: var(--c-cream);
}
.page-about .about-section--journey{
  background: var(--c-white);
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-section--data{
  background: var(--c-navy);
  color: var(--c-white);
}
.page-about .about-section--workflow{
  background: var(--c-teal);
  color: var(--c-white);
}
.page-about .about-section--culture{
  background: var(--c-cream);
}

.page-about .about-section__chapter{
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 10px;
}
.page-about .about-section__chapter .chapter__index{
  font-family: var(--ff-body);
  font-weight: 700;
  font-size: 54px;
  line-height: 0.9;
  color: var(--c-orange);
  opacity: 0.34;
  margin-left: -12px;
}
.page-about .about-section__chapter .chapter__title{
  margin: 0;
  font-family: var(--ff-heading);
  font-size: 30px;
  line-height: 1.08;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--c-navy);
}
.page-about .about-section__lead{
  margin: 0 0 26px;
  max-width: 720px;
  font-family: var(--ff-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--c-slate);
}

/* 深色章节文字调整 */
.page-about .about-section--data .chapter__title,
.page-about .about-section--workflow .chapter__title{
  color: var(--c-white);
}
.page-about .about-section--data .chapter__index,
.page-about .about-section--workflow .chapter__index{
  color: var(--c-cyan);
  opacity: 0.5;
}
.page-about .about-section--data .about-section__lead,
.page-about .about-section--workflow .about-section__lead{
  color: rgba(245,240,232,0.86);
}

/* ===== 01 品牌声明 · 编辑案头 ===== */
.page-about .about-desk{
  display: grid;
  grid-template-areas:
    "main"
    "art"
    "stats"
    "note";
  gap: 22px;
  background: var(--c-white);
  border: 1px solid var(--c-line);
  box-shadow: 8px 8px 0 rgba(10,22,40,0.06), 16px 16px 0 rgba(10,22,40,0.035);
  padding: 28px 24px;
}
.page-about .about-desk__main{
  grid-area: main;
  padding-top: 8px;
}
.page-about .about-desk__crumb{
  margin-bottom: 18px;
  font-size: 14px;
}
.page-about .about-desk__crumb a{
  color: var(--c-slate);
  text-decoration: none;
}
.page-about .about-desk__crumb a:hover{
  color: var(--c-orange);
}
.page-about .about-desk__kicker{
  margin: 0 0 10px;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-orange);
}
.page-about .about-desk__title{
  margin: 0 0 18px;
  font-family: var(--ff-heading);
  font-size: clamp(34px, 5.6vw, 74px);
  font-weight: 700;
  line-height: 1.06;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  color: var(--c-navy);
}
.page-about .about-desk__lead{
  margin: 0 0 22px;
  font-family: var(--ff-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-slate);
}
.page-about .about-desk__btn{
  margin-top: 4px;
}
.page-about .about-desk__art{
  grid-area: art;
  margin: 0;
  transform: rotate(0.7deg);
  box-shadow: 10px 12px 0 rgba(10,22,40,0.07);
}
.page-about .about-desk__art img{
  aspect-ratio: 3 / 2;
  object-fit: cover;
  width: 100%;
  height: auto;
  display: block;
}
.page-about .about-desk__stats{
  grid-area: stats;
  border-top: 1px solid var(--c-line);
  padding-top: 18px;
}
.page-about .about-desk__stats-label{
  margin: 0 0 12px;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-slate);
}
.page-about .about-desk__stats-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.page-about .about-desk__stat{
  margin: 0;
  padding: 16px 12px;
  background: var(--c-cream);
  border: 1px solid var(--c-line);
}
.page-about .about-desk__stat .stat__value{
  display: block;
  font-family: var(--ff-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-navy);
  margin-bottom: 6px;
}
.page-about .about-desk__stat .stat__label{
  display: block;
  font-family: var(--ff-heading);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-slate);
}
.page-about .about-desk__note{
  grid-area: note;
  border-left: 3px solid var(--c-orange);
  background: rgba(255,107,53,0.07);
  padding: 12px 16px;
}
.page-about .about-desk__note p{
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-slate);
}

/* ===== 02 发展历程 · 时间轴长卷 ===== */
.page-about .about-timeline{
  position: relative;
  margin: 28px 0 40px;
}
.page-about .about-timeline__line{
  display: none;
}
.page-about .about-timeline__list{
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 0 0 0 18px;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--c-line);
}
.page-about .about-timeline__item{
  position: relative;
  padding-left: 28px;
}
.page-about .about-timeline__dot{
  position: absolute;
  left: -11px;
  top: 22px;
  transform: translate(-50%, -50%);
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--c-orange);
  border: 2px solid var(--c-white);
  box-shadow: 0 0 0 2px var(--c-orange), 0 4px 8px rgba(10,22,40,0.18);
  color: var(--c-white);
  font-family: var(--ff-mono);
  font-size: 9px;
  font-weight: 700;
}
.page-about .about-timeline__card{
  margin: 0;
  background: var(--c-white);
  border: 1px solid var(--c-line);
}
.page-about .about-timeline__head{
  display: block;
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 0;
}
.page-about .about-timeline__head::-webkit-details-marker{
  display: none;
}
.page-about .about-timeline__head::after{
  content: "+";
  position: absolute;
  right: 14px;
  top: 14px;
  font-family: var(--ff-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--c-orange);
}
.page-about .about-timeline__card[open] .about-timeline__head::after{
  content: "–";
}
.page-about .about-timeline__head .tag{
  display: inline-block;
}
.page-about .about-timeline__head h3{
  margin: 8px 24px 0 0;
  font-family: var(--ff-heading);
  font-size: 21px;
  line-height: 1.2;
  color: var(--c-ink);
}
.page-about .about-timeline__body{
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--c-line);
  font-size: 15px;
  line-height: 1.65;
  color: var(--c-slate);
}
.page-about .about-timeline__body p{
  margin: 0;
}
.page-about .about-timeline__card.card--navy .about-timeline__head h3{
  color: var(--c-white);
}
.page-about .about-timeline__card.card--navy .about-timeline__body{
  color: rgba(245,240,232,0.84);
  border-top-color: rgba(255,255,255,0.18);
}
.page-about .about-timeline__card[open]{
  box-shadow: 0 14px 28px rgba(10,22,40,0.12);
}

/* ===== 03 数据能力 · 滚动卡片带 ===== */
.page-about .about-data{
  margin-top: 6px;
}
.page-about .about-data__intro{
  margin-bottom: 22px;
  display: grid;
  gap: 16px;
}
.page-about .about-data__intro p{
  margin: 0;
  max-width: 660px;
  font-family: var(--ff-body);
  font-size: 17px;
  line-height: 1.75;
  color: rgba(245,240,232,0.86);
}
.page-about .about-data__tags{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .about-data__tags .tag{
  margin: 0;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.24);
  color: var(--c-white);
}
.page-about .about-data__track{
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 4px 4px 18px;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--c-orange) rgba(255,255,255,0.14);
  -webkit-overflow-scrolling: touch;
}
.page-about .about-data__card{
  flex: 0 0 258px;
  scroll-snap-align: start;
  margin: 0;
  background: var(--c-white);
  border: 1px solid var(--c-line);
  padding: 24px 20px 18px;
}
.page-about .about-data__card .about-data__num{
  display: block;
  font-family: var(--ff-mono);
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 12px;
  color: var(--c-orange);
}
.page-about .about-data__card h3{
  margin: 0 0 8px;
  font-family: var(--ff-heading);
  font-size: 20px;
  line-height: 1.2;
  color: var(--c-ink);
}
.page-about .about-data__card p{
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-slate);
}
.page-about .about-data__card.card--navy{
  background: var(--c-navy);
  border-color: rgba(255,255,255,0.22);
}
.page-about .about-data__card.card--navy h3{
  color: var(--c-white);
}
.page-about .about-data__card.card--navy p{
  color: rgba(245,240,232,0.8);
}
.page-about .about-data__card.card--navy .about-data__num{
  color: var(--c-cyan);
}
.page-about .about-data__more{
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 14px;
}
.page-about .about-data__more span{
  padding: 3px 8px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-family: var(--ff-mono);
  font-size: 11px;
  color: var(--c-slate);
}

/* ===== 04 编辑部工作流 ===== */
.page-about .about-flow{
  display: grid;
  gap: 30px;
  margin-top: 6px;
}
.page-about .about-flow__list{
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-flow__step{
  position: relative;
  padding: 22px 20px 18px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.16);
}
.page-about .about-flow__no{
  display: block;
  font-family: var(--ff-mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
  margin-bottom: 12px;
}
.page-about .about-flow__step h3{
  margin: 0 0 8px;
  font-family: var(--ff-heading);
  font-size: 20px;
  line-height: 1.2;
  color: var(--c-white);
}
.page-about .about-flow__step p{
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: rgba(245,240,232,0.78);
}
.page-about .about-flow__figure{
  margin: 0;
}
.page-about .about-flow__figure img{
  aspect-ratio: 3 / 2;
  object-fit: cover;
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 05 会员与反馈文化 ===== */
.page-about .about-culture{
  display: grid;
  gap: 24px;
  margin-top: 6px;
}
.page-about .about-culture__text p{
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-ink);
}
.page-about .about-culture__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}
.page-about .about-culture__btn{
  margin: 0;
}
.page-about .about-culture__quote-card{
  position: relative;
  margin: 0;
  padding: 28px 24px;
  background: var(--c-navy);
  border-color: rgba(255,255,255,0.16);
}
.page-about .about-culture__quote-mark{
  display: block;
  font-family: var(--ff-heading);
  font-size: 64px;
  line-height: 0.5;
  color: var(--c-orange);
  margin-bottom: 18px;
}
.page-about .about-culture__quote-card blockquote{
  margin: 0 0 18px;
  font-family: var(--ff-heading);
  font-size: 22px;
  line-height: 1.45;
  color: var(--c-white);
}
.page-about .about-culture__meta{
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(245,240,232,0.68);
}

/* ===== 页内图片通用约束 ===== */
.page-about .figure-frame{
  margin: 0;
}
.page-about .figure-frame img{
  max-width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}
.page-about .about-section__figure{
  margin: 28px 0 0;
}
.page-about .about-section__figure img{
  aspect-ratio: 16 / 9;
  width: 100%;
}

/* ===== 桌面端：左侧固定目录 + 长卷分色 ===== */
@media (min-width: 960px){
  .page-about{
    padding: 0;
  }
  .page-about .about-layout{
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 0;
    padding: 0 48px;
  }
  .page-about .about-rail{
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    z-index: 5;
    margin: 0;
    padding: 0;
    background: transparent;
    border-bottom: none;
    overflow: visible;
  }
  .page-about .about-rail__inner{
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    min-width: 0;
    padding: 28px 28px 28px 0;
  }
  .page-about .about-rail__kicker{
    display: block;
    font-family: var(--ff-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--c-slate);
    margin-bottom: 16px;
  }
  .page-about .about-rail__nav{
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .page-about .about-rail__link{
    justify-content: flex-start;
    gap: 10px;
    padding: 10px 13px;
    border-radius: 0;
    border: none;
    border-left: 2px solid transparent;
    background: transparent;
    color: var(--c-ink);
    font-size: 14px;
    white-space: normal;
    transition: background 0.2s ease, border-color 0.2s ease;
  }
  .page-about .about-rail__link:hover{
    background: rgba(255,107,53,0.08);
    border-left-color: var(--c-orange);
  }
  .page-about .about-rail__no{
    color: var(--c-orange);
    font-size: 12px;
  }
  .page-about .about-rail__footer{
    display: block;
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--c-line);
  }
  .page-about .about-rail__note{
    display: block;
    margin: 0 0 14px;
    font-family: var(--ff-heading);
    font-size: 14px;
    line-height: 1.5;
    color: var(--c-slate);
  }

  .page-about .about-body{
    min-width: 0;
  }
  .page-about .about-section{
    padding: 76px 0 72px;
  }
  .page-about .about-section__chapter .chapter__index{
    margin-left: -44px;
    font-size: 96px;
    opacity: 0.45;
  }
  .page-about .about-section__chapter .chapter__title{
    font-size: 40px;
  }
  .page-about .about-section__lead{
    font-size: 18px;
    margin-bottom: 40px;
  }

  /* 01 desk */
  .page-about .about-desk{
    grid-template-areas:
      "main art"
      "stats stats"
      "note note";
    grid-template-columns: 1.05fr 0.95fr;
    gap: 28px 48px;
    padding: 40px 44px;
    align-items: start;
  }
  .page-about .about-desk__main{
    padding-top: 16px;
  }
  .page-about .about-desk__art{
    margin-top: 8px;
  }
  .page-about .about-desk__stats-grid{
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
  }

  /* 02 时间轴横向错位 */
  .page-about .about-timeline{
    height: 360px;
    margin: 36px 0 66px;
  }
  .page-about .about-timeline__line{
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
  }
  .page-about .about-timeline__list{
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
    margin: 0;
    padding: 0;
    border-left: none;
    height: 100%;
    align-items: stretch;
  }
  .page-about .about-timeline__item{
    padding: 0;
  }
  .page-about .about-timeline__item:nth-child(1){
    --dot-y: 66.7%;
  }
  .page-about .about-timeline__item:nth-child(2){
    --dot-y: 33.3%;
  }
  .page-about .about-timeline__item:nth-child(3){
    --dot-y: 58.3%;
  }
  .page-about .about-timeline__item:nth-child(4){
    --dot-y: 25%;
  }
  .page-about .about-timeline__item:nth-child(5){
    --dot-y: 44.4%;
  }
  .page-about .about-timeline__dot{
    left: 50%;
    top: var(--dot-y);
    width: 52px;
    height: 52px;
    font-size: 12px;
    border-width: 2px;
    box-shadow: 0 0 0 2px var(--c-orange), 0 6px 16px rgba(10,22,40,0.2);
  }
  .page-about .about-timeline__card{
    position: absolute;
    width: 90%;
    left: 5%;
    margin: 0;
  }
  .page-about .about-timeline__item--u .about-timeline__card{
    top: calc(var(--dot-y) + 38px);
  }
  .page-about .about-timeline__item--d .about-timeline__card{
    bottom: calc(100% - var(--dot-y) + 38px);
  }

  /* 03 数据区双栏 */
  .page-about .about-data{
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 44px;
    align-items: start;
  }
  .page-about .about-data__intro{
    position: sticky;
    top: calc(var(--header-h) + 40px);
    margin-bottom: 0;
  }
  .page-about .about-data__track{
    max-width: 100%;
    padding-bottom: 22px;
  }
  .page-about .about-data__more{
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, margin-top 0.35s ease, opacity 0.35s ease;
  }
  .page-about .about-data__card:hover .about-data__more,
  .page-about .about-data__card:focus-within .about-data__more{
    max-height: 120px;
    margin-top: 14px;
    opacity: 1;
  }

  /* 04 工作流双栏 */
  .page-about .about-flow{
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
    align-items: start;
  }
  .page-about .about-flow__list{
    grid-template-columns: 1fr 1fr;
    gap: 18px;
  }
  .page-about .about-flow__no{
    position: absolute;
    right: 14px;
    top: 12px;
    font-size: 46px;
    opacity: 0.3;
  }
  .page-about .about-flow__step{
    padding-top: 26px;
  }
  .page-about .about-flow__figure{
    position: sticky;
    top: calc(var(--header-h) + 40px);
  }

  /* 05 文化双栏 */
  .page-about .about-culture{
    grid-template-columns: 1.08fr 0.92fr;
    gap: 48px;
    align-items: center;
  }
}