/* ============ 品牌志 · 页面专属样式（作用域 .page-about） ============ */
.page-about {
  --about-rail-w: 15rem;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 1.5rem;
}
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--stone);
}
.page-about .crumbs li {
  display: flex;
  align-items: center;
  gap: .55rem;
}
.page-about .crumbs li + li::before {
  content: "/";
  color: var(--line-strong);
}
.page-about .crumbs a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.page-about .crumbs a:hover {
  color: var(--sand);
  border-bottom-color: var(--sand);
}
.page-about .crumbs [aria-current="page"] {
  color: var(--deep);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 2.4rem 0 3.2rem;
  background: var(--sand-mist);
  border-bottom: 1px solid var(--line-strong);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 92px 92px;
  opacity: .55;
}
.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}
.page-about .about-hero .eyebrow {
  color: var(--sand);
  letter-spacing: .2em;
}
.page-about .about-title {
  margin: 1rem 0 0;
  max-width: 22ch;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.95rem, 1.1rem + 4.6vw, 4rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--deep);
}
.page-about .about-title::after {
  content: "";
  display: block;
  width: 5.5rem;
  height: 4px;
  margin-top: 1.25rem;
  background: var(--sand);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.7rem;
  margin-top: 1.9rem;
}
.page-about .about-coord {
  margin: 0;
  padding-left: .75rem;
  border-left: 2px solid var(--sand);
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--deep);
}
.page-about .about-note-text {
  margin: .7rem 0 0;
  font-size: .85rem;
  line-height: 1.75;
  color: var(--stone);
  max-width: 20rem;
}
.page-about .about-hero-lead {
  min-width: 0;
  max-width: 44rem;
}
.page-about .about-hero-lead p {
  margin: 0 0 1.05rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-hero-lead p:last-of-type {
  color: var(--deep);
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}

/* ---------- 文档网格：左窄注释栏 + 右侧宽内容 ---------- */
.page-about .about-doc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding: .5rem 0 3rem;
}

.page-about .about-rail {
  padding: 1.5rem 0 1.2rem;
  border-bottom: 1px solid var(--line);
}
.page-about .about-rail-title {
  margin: 0 0 .9rem;
  color: var(--stone);
  letter-spacing: .2em;
}
.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem .95rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-toc a {
  display: block;
  padding: .3rem 0;
  font-size: .82rem;
  line-height: 1.5;
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.page-about .about-toc a:hover {
  color: var(--sand);
}
.page-about .about-toc a.is-active {
  color: var(--deep);
  border-bottom-color: var(--sand);
}

.page-about .about-glossary {
  display: none;
  margin: 1.8rem 0 0;
  padding: 1.1rem 0 0;
  border-top: 1px solid var(--line);
}
.page-about .about-glossary dt {
  margin-top: .85rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--snow);
}
.page-about .about-glossary dt:first-child {
  margin-top: 0;
}
.page-about .about-glossary dd {
  margin: .32rem 0 0;
  font-size: .78rem;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}
.page-about .about-section {
  padding: 2.6rem 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-section:last-child {
  border-bottom: 0;
  padding-bottom: 1rem;
}
.page-about .about-section-head {
  margin-bottom: 1.5rem;
}
.page-about .about-index {
  display: inline-block;
  margin: 0 0 .8rem;
  font-size: .74rem;
  letter-spacing: .22em;
  color: var(--sand);
}
.page-about .about-index::before {
  content: "— ";
  color: var(--line-strong);
  letter-spacing: 0;
}
.page-about .about-section .section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.4rem, 1.05rem + 1.5vw, 2.05rem);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--deep);
}
.page-about .about-section-body {
  min-width: 0;
  max-width: 42rem;
}
.page-about .about-section-body > p {
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--ink);
}

/* ---------- 引文块 ---------- */
.page-about .about-quote {
  margin: 1.9rem 0;
  padding: .2rem 0 .2rem 1.3rem;
  border-left: 3px solid var(--clay);
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, .95rem + 1vw, 1.5rem);
  line-height: 1.65;
  color: var(--deep);
}

/* ---------- 附注 ---------- */
.page-about .about-margin {
  margin: 1.7rem 0 0;
  padding: .15rem 0 .15rem 1rem;
  border-left: 1px solid var(--snow);
}
.page-about .about-margin p {
  margin: .35rem 0 0;
  font-size: .85rem;
  line-height: 1.75;
  color: var(--stone);
  max-width: 32rem;
}
.page-about .about-margin-label {
  display: block;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--snow);
}

/* ---------- 图片 ---------- */
.page-about .figure {
  position: relative;
  margin: 1.8rem 0 0;
  border: 1px solid var(--line);
  background: var(--white);
  overflow: hidden;
}
.page-about .figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure--square {
  max-width: 26rem;
}
.page-about .figure-cap {
  display: block;
  padding: .7rem .95rem;
  border-top: 1px solid var(--line);
  background: var(--white);
  font-size: .76rem;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--stone);
}

/* ---------- 流程步骤 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .9rem;
  margin: 1.7rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-step {
  padding: 1.05rem 1.15rem 1.2rem;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--sand);
}
.page-about .about-step-num {
  display: block;
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--sand);
}
.page-about .about-step h3 {
  margin: .45rem 0 .5rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--deep);
}
.page-about .about-step p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .9rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-role {
  padding: 1.1rem 1.15rem 1.25rem;
  background: var(--white);
  border: 1px solid var(--line);
}
.page-about .about-role-num {
  display: block;
  font-size: 1.55rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--snow);
}
.page-about .about-role strong {
  display: block;
  margin: .55rem 0 .45rem;
  font-size: .98rem;
  font-weight: 700;
  color: var(--deep);
}
.page-about .about-role span:last-child {
  display: block;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 1.9rem 0 0;
  padding: 0 0 0 2.4rem;
  list-style: none;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: .5rem;
  top: .55rem;
  bottom: 1.4rem;
  width: 1px;
  background: var(--line-strong);
}
.page-about .about-node {
  position: relative;
  padding-bottom: 1.85rem;
}
.page-about .about-node:last-child {
  padding-bottom: 0;
}
.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -2.18rem;
  top: .42rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 1.5px solid var(--sand);
}
.page-about .about-node--now::before {
  background: var(--arena);
  border-color: var(--arena);
  box-shadow: 0 0 0 4px rgba(159, 232, 112, .22);
}
.page-about .about-node-year {
  display: block;
  margin-bottom: .3rem;
  font-size: .8rem;
  letter-spacing: .14em;
  color: var(--sand);
}
.page-about .about-node h3 {
  margin: 0 0 .4rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--deep);
}
.page-about .about-node p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--ink);
  max-width: 36rem;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 1.5rem 0 1.4rem;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-partners li {
  padding: 1.05rem 1.15rem 1.15rem;
  background: var(--paper);
}
.page-about .about-partners strong {
  display: block;
  margin-bottom: .38rem;
  font-size: .95rem;
  font-weight: 700;
  color: var(--deep);
}
.page-about .about-partners span {
  display: block;
  font-size: .87rem;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: 1rem;
  padding: 2.9rem 0;
  background: var(--night);
  color: var(--white);
}
.page-about .about-cta-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.6rem;
}
.page-about .about-cta-eyebrow {
  color: var(--arena);
  letter-spacing: .2em;
}
.page-about .about-cta .section-title {
  margin: .7rem 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.35rem, 1.05rem + 1.4vw, 1.95rem);
  line-height: 1.3;
  color: var(--white);
}
.page-about .about-cta-text {
  margin: 1rem 0 0;
  max-width: 34rem;
  font-size: .94rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, .76);
}
.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  align-content: start;
}
.page-about .about-cta .btn--ghost {
  color: var(--white);
  border-color: rgba(255, 255, 255, .42);
}
.page-about .about-cta .btn--ghost:hover {
  color: var(--arena);
  border-color: var(--arena);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-team,
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-flow .about-step:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 3rem 0 3.8rem;
  }
  .page-about .about-hero-grid {
    grid-template-columns: 15rem minmax(0, 1fr);
    gap: 2.8rem;
    align-items: start;
    margin-top: 2.3rem;
  }
  .page-about .about-cta-shell {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: center;
    gap: 2.4rem;
  }
}

@media (min-width: 1000px) {
  .page-about .about-doc {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 4.5rem;
    padding-top: 1rem;
  }
  .page-about .about-rail {
    position: sticky;
    top: 6.5rem;
    padding: 3.2rem 0 1rem;
    border-bottom: 0;
  }
  .page-about .about-toc {
    flex-direction: column;
    gap: .1rem;
  }
  .page-about .about-toc a {
    padding: .42rem 0 .42rem .8rem;
    border-left: 2px solid transparent;
    border-bottom: 0;
  }
  .page-about .about-toc a.is-active {
    border-left-color: var(--sand);
    border-bottom-color: transparent;
    background: rgba(242, 228, 206, .55);
  }
  .page-about .about-glossary {
    display: block;
  }
  .page-about .about-section {
    padding: 3.2rem 0;
  }
  .page-about .about-section:first-child {
    padding-top: 2.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc a,
  .page-about .crumbs a {
    transition: none;
  }
}