.page-about {
  --about-rail: 96px;
  --about-gap: clamp(56px, 7vw, 104px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(36px, 5.4vw, 76px) 0 clamp(40px, 5vw, 68px);
  background: linear-gradient(176deg, #EFEBE1 0%, var(--porcelain) 54%, #F1EDE3 100%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 88px 88px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--gold) 32%, var(--cinnabar) 68%, transparent 100%);
  opacity: .45;
}

.page-about .about-hero > .canvas {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 780px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(27px, 4.4vw, 50px);
  line-height: 1.26;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 640px;
  color: var(--text-body);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--text-muted);
}

.page-about .about-hero__meta li {
  display: inline-flex;
  align-items: center;
  gap: 20px;
}

.page-about .about-hero__meta li + li::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--line-strong);
}

.page-about .about-hero__meta .mono {
  letter-spacing: .08em;
}

.page-about .about-hero__meta a {
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 64, 47, .38);
  padding-bottom: 1px;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-hero__meta a:hover,
.page-about .about-hero__meta a:focus-visible {
  color: var(--cinnabar-deep);
  border-bottom-color: var(--cinnabar-deep);
}

/* ---------- 正文画布 ---------- */
.page-about .about-body {
  padding: clamp(48px, 7vw, 96px) 0 clamp(60px, 8vw, 116px);
  background: var(--porcelain);
}

.page-about .about-body__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: var(--about-gap);
}

.page-about .about-main {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  min-width: 0;
}

/* ---------- 左侧刻度线 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail__ticks {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(46px, 5.2vw, 72px);
}

.page-about .about-rail__ticks::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 7px;
  bottom: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 39, .32) 48%, var(--line) 100%);
}

.page-about .about-rail__ticks li {
  position: relative;
  padding-left: 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  letter-spacing: .16em;
  color: var(--text-muted);
}

.page-about .about-rail__ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--porcelain);
}

.page-about .about-rail__ticks li:first-child {
  color: var(--gold);
}

.page-about .about-rail__ticks li:first-child::before {
  background: var(--gold);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  min-width: 0;
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  column-gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-strong);
  margin-bottom: clamp(22px, 2.8vw, 34px);
}

.page-about .about-sec__no {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(20px, 2.4vw, 30px);
  line-height: 1.36;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-sec__intro {
  margin: calc(clamp(22px, 2.8vw, 34px) * -1 + 8px) 0 clamp(22px, 2.8vw, 30px);
  max-width: 36em;
  font-size: clamp(14px, 1vw, 15.5px);
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .about-sec__body p,
.page-about .about-what__text p,
.page-about .about-line__text p {
  margin: 0 0 1.05em;
  max-width: 38em;
  font-size: clamp(15px, 1.05vw, 16px);
  line-height: 1.86;
  color: var(--text-body);
}

.page-about .about-sec__body p:last-child,
.page-about .about-what__text p:last-child,
.page-about .about-line__text p:last-child {
  margin-bottom: 0;
}

/* ---------- 品牌在做什么 ---------- */
.page-about .about-what {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.4vw, 42px);
}

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

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: var(--shadow-paper);
}

.page-about .about-fig figcaption {
  margin-top: 16px;
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--text-muted);
}

.page-about .about-team__fig {
  margin-top: clamp(26px, 3.4vw, 42px);
}

/* ---------- 三条主线 ---------- */
.page-about .about-lines {
  display: flex;
  flex-direction: column;
}

.page-about .about-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding: clamp(20px, 2.6vw, 30px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-line:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-line__key {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-line__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(18px, 1.8vw, 22px);
  line-height: 1.4;
  letter-spacing: -.005em;
  color: var(--ink);
}

.page-about .about-line__title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: .82em;
  margin-right: 10px;
  vertical-align: -.04em;
  background: var(--cinnabar);
}

/* ---------- 通栏横幅 ---------- */
.page-about .about-band {
  margin: clamp(28px, 3.6vw, 44px) 0 0;
  padding: clamp(12px, 1.6vw, 20px);
  background: var(--ink);
}

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

/* ---------- 时间线索 ---------- */
.page-about .about-tl__track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(28px, 3.6vw, 42px);
}

.page-about .about-tl__node {
  position: relative;
  padding-left: 28px;
}

.page-about .about-tl__node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: -46px;
  width: 1px;
  background: var(--line);
}

.page-about .about-tl__node:last-child::before {
  display: none;
}

.page-about .about-tl__node::after {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--celadon);
  box-shadow: 0 0 0 3px rgba(63, 122, 106, .16);
}

.page-about .about-tl__stamp {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-tl__label {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.44;
  color: var(--ink);
}

.page-about .about-tl__note {
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-muted);
}

.page-about .about-tl__node:hover .about-tl__label,
.page-about .about-tl__node:focus .about-tl__label {
  color: var(--cinnabar-deep);
}

/* ---------- 引用句 ---------- */
.page-about .about-quote {
  margin: clamp(26px, 3.4vw, 40px) 0 clamp(26px, 3.2vw, 34px);
  padding: clamp(20px, 2.6vw, 30px) clamp(20px, 2.8vw, 36px);
  background: var(--paper);
  border-left: 3px solid var(--cinnabar);
  box-shadow: 6px 6px 0 -1px rgba(91, 107, 124, .10);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.6vw, 20px);
  line-height: 1.72;
  letter-spacing: .01em;
  color: var(--ink);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(28px, 3.6vw, 42px);
}

.page-about .about-signoff {
  margin: clamp(22px, 2.8vw, 30px) 0 0;
  max-width: 38em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .about-status {
  margin-top: clamp(18px, 2.4vw, 26px);
  font-size: 13px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-line {
    grid-template-columns: 160px minmax(0, 1fr);
    column-gap: clamp(24px, 3.4vw, 52px);
    padding: clamp(24px, 3vw, 36px) 0;
  }
}

@media (min-width: 860px) {
  .page-about .about-what {
    grid-template-columns: minmax(0, 1fr) minmax(210px, 300px);
    column-gap: clamp(28px, 4vw, 60px);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-tl__track {
    flex-direction: row;
    align-items: stretch;
    gap: clamp(14px, 1.8vw, 28px);
  }

  .page-about .about-tl__node {
    flex: 1 1 0;
    min-width: 0;
    padding-left: 0;
    padding-top: 24px;
  }

  .page-about .about-tl__node::before {
    left: 0;
    right: 0;
    top: 4px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .about-tl__node::after {
    left: 0;
    top: 0;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .about-tl__note {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .34s var(--ease), opacity .3s var(--ease), margin-top .34s var(--ease);
  }

  .page-about .about-tl__node:hover .about-tl__note,
  .page-about .about-tl__node:focus .about-tl__note,
  .page-about .about-tl__node:focus-within .about-tl__note {
    max-height: 14em;
    margin-top: 6px;
    opacity: 1;
  }
}

@media (min-width: 1020px) {
  .page-about .about-body__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 72px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 108px;
  }
}

@media (max-width: 560px) {
  .page-about .about-hero__meta li + li::before {
    width: 12px;
  }

  .page-about .about-band {
    padding: 8px;
  }
}