/* ===================== 品牌价值 / 赛季年鉴 ===================== */
.page-about {
  --ab-hair: rgba(108, 127, 140, .32);
  --ab-hair-soft: rgba(108, 127, 140, .14);
  display: block;
  padding-bottom: clamp(48px, 8vw, 116px);
}

/* ---------- 面包屑后的留白 ---------- */
.page-about .crumbs {
  margin-top: clamp(12px, 2vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 52px) 0 clamp(28px, 4vw, 52px);
}

.page-about .hero-scale {
  height: 10px;
  margin-bottom: clamp(22px, 3.4vw, 44px);
  border-bottom: 1px solid var(--ab-hair);
  background-image: repeating-linear-gradient(90deg, var(--ab-hair) 0 1px, transparent 1px 34px);
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-hero h1 {
  margin: 0 0 .45em;
  max-width: 20em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.05rem, 6.6vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  margin: 0;
  max-width: 42em;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .hero-meta {
  list-style: none;
  margin: clamp(26px, 3.4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ab-hair);
}

.page-about .hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 14px 0;
  border-bottom: 1px solid var(--ab-hair-soft);
}

.page-about .hm-k {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--line);
}

.page-about .hm-v {
  font-family: var(--mono);
  font-size: clamp(.95rem, 1.4vw, 1.1rem);
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

@media (min-width: 700px) {
  .page-about .hero-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .hero-meta li {
    padding: 16px 18px 8px;
    border-bottom: 0;
    border-left: 1px solid var(--ab-hair-soft);
  }
  .page-about .hero-meta li:first-child {
    padding-left: 0;
    border-left: 0;
  }
}

/* ---------- 图片容器 ---------- */
.page-about .about-shot-block {
  margin: 0 0 clamp(44px, 7vw, 104px);
}

.page-about .ab-shot {
  overflow: hidden;
  border: 1px solid var(--ab-hair);
  background: var(--ink-2);
}

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

.page-about .ab-shot--wide {
  aspect-ratio: 14 / 9;
}

.page-about .ab-shot--std {
  aspect-ratio: 3 / 2;
}

.page-about .media-cap {
  margin-top: 12px;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--line);
}

/* ---------- 主体网格 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
}

@media (min-width: 1000px) {
  .page-about .about-grid {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(44px, 6vw, 92px);
  }
}

/* ---------- 左侧章节索引 ---------- */
.page-about .year-rail {
  display: none;
}

@media (min-width: 1000px) {
  .page-about .year-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: 40px;
  }
}

.page-about .rail-head {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ab-hair);
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--line);
}

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

.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--ab-hair-soft);
  font-size: .84rem;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s ease, padding-left .2s ease;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--cyan);
  padding-left: 4px;
}

.page-about .rail-num {
  font-family: var(--mono);
  font-size: .7rem;
  color: var(--line);
}

.page-about .rail-link:hover .rail-num {
  color: var(--cyan);
}

/* ---------- 时间线轨道 ---------- */
.page-about .about-flow {
  --ab-pad: clamp(22px, 4.5vw, 48px);
  position: relative;
  min-width: 0;
  border-left: 1px solid var(--ab-hair);
  padding-left: var(--ab-pad);
}

.page-about .chapter {
  position: relative;
  padding-bottom: clamp(56px, 9vw, 128px);
  scroll-margin-top: 96px;
}

.page-about .chapter:last-child {
  padding-bottom: clamp(30px, 5vw, 60px);
}

.page-about .chapter::before {
  content: "";
  position: absolute;
  top: 14px;
  left: calc(-1 * var(--ab-pad) - 5px);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--ab-node-color, var(--cyan));
  box-sizing: border-box;
}

.page-about .chapter[data-chapter="01"] { --ab-node-color: var(--cyan); }
.page-about .chapter[data-chapter="02"] { --ab-node-color: var(--cyan-deep); }
.page-about .chapter[data-chapter="03"] { --ab-node-color: var(--stoppage); }
.page-about .chapter[data-chapter="04"] { --ab-node-color: var(--window); }
.page-about .chapter[data-chapter="05"] { --ab-node-color: var(--violet); }
.page-about .chapter[data-chapter="06"] { --ab-node-color: var(--line); }

/* ---------- 章节头 ---------- */
.page-about .chapter-head {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .chapter-kicker {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .ch-num {
  font-family: var(--mono);
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  line-height: .9;
  letter-spacing: -.02em;
  color: var(--ab-node-color, var(--cyan));
  font-variant-numeric: tabular-nums;
}

.page-about .chapter h2 {
  margin: 0;
  max-width: 22em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.6vw, 2.5rem);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--paper);
}

/* ---------- 正文 ---------- */
.page-about .chapter-body {
  max-width: 40em;
}

.page-about .chapter-body p {
  margin: 0 0 1.1em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .chapter-body .n {
  font-family: var(--mono);
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .chapter-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(35, 230, 208, .32);
  transition: border-color .2s ease;
}

.page-about .chapter-body a:hover,
.page-about .chapter-body a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 图文分栏 ---------- */
.page-about .chapter-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

@media (min-width: 880px) {
  .page-about .chapter-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: clamp(32px, 4vw, 56px);
  }
}

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

/* ---------- 三步流程 ---------- */
.page-about .flow-wrap {
  margin-top: clamp(22px, 3vw, 34px);
  padding: clamp(20px, 3vw, 34px) clamp(18px, 2.6vw, 32px);
  border: 1px solid var(--ab-hair);
  background:
    linear-gradient(180deg, rgba(18, 28, 38, .72) 0%, rgba(6, 10, 14, 0) 100%),
    var(--ink);
}

.page-about .flow-svg {
  display: block;
  width: 100%;
  height: auto;
  min-height: 64px;
}

.page-about .flow-steps {
  list-style: none;
  margin: clamp(12px, 2vw, 20px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 26px);
}

@media (min-width: 780px) {
  .page-about .flow-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    text-align: center;
  }
}

.page-about .flow-steps li {
  padding-top: 14px;
  border-top: 1px solid var(--ab-hair-soft);
}

.page-about .flow-idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}

.page-about .flow-steps li:last-child .flow-idx {
  color: var(--stoppage);
}

.page-about .flow-steps h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .flow-steps p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .flow-extra {
  margin-top: 10px !important;
  padding-top: 10px;
  border-top: 1px dashed var(--ab-hair-soft);
  font-size: .82rem !important;
  color: var(--line) !important;
}

@media (hover: hover) and (min-width: 780px) {
  .page-about .flow-extra {
    opacity: 0;
    transform: translateY(4px);
    transition: opacity .22s ease, transform .22s ease;
  }
  .page-about .flow-steps li:hover .flow-extra,
  .page-about .flow-steps li:focus-within .flow-extra {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 均值强调句 ---------- */
.page-about .chapter-note {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 12px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ab-hair);
  font-size: .9rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .chapter-note .n {
  font-family: var(--mono);
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  line-height: 1;
  color: var(--stoppage);
  font-variant-numeric: tabular-nums;
}

/* ---------- 版本轨迹时间轴 ---------- */
.page-about .about-shot-block--mid {
  margin-left: 0;
}

.page-about .era-list {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .era-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px 22px;
  padding: clamp(16px, 2.4vw, 26px) 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .era-item:last-child {
  border-bottom: 1px solid var(--ab-hair);
}

@media (min-width: 720px) {
  .page-about .era-item {
    grid-template-columns: 138px minmax(0, 1fr);
  }
}

.page-about .era-key {
  font-family: var(--mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--line);
  font-variant-numeric: tabular-nums;
}

.page-about .era-item--now .era-key {
  color: var(--window);
}

.page-about .era-title {
  margin: 0 0 8px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.9vw, 1.32rem);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .era-body p {
  margin: 0;
  max-width: 40em;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 窄屏收尾 ---------- */
@media (max-width: 520px) {
  .page-about .chapter-kicker {
    flex-wrap: wrap;
    gap: 8px;
  }
  .page-about .chapter-head {
    margin-bottom: 16px;
  }
  .page-about .flow-wrap {
    padding: 18px 14px;
  }
}