/* ============================================================
   品牌文化 · page-about
   作用域：.page-about
   ============================================================ */

.page-about {
  --about-rail-pad: 42px;
  --about-num-offset: 15px;
  background: var(--cream);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3.5vw, 40px) 0 0;
  background: linear-gradient(180deg, var(--cream) 0%, var(--paper) 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -70px;
  right: -80px;
  width: min(48vw, 520px);
  height: 260px;
  background: var(--deep);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 2;
}

.page-about .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 36px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.page-about .about-hero-copy {
  grid-column: 1 / span 8;
}

.page-about .about-kicker {
  font-family: var(--font-index);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--moss);
  margin: 0 0 16px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(27px, 4.6vw, 46px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--deep);
  margin: 0 0 20px;
  max-width: 17ch;
}

.page-about .about-hero .lede {
  max-width: 60ch;
  color: var(--ink);
  margin: 0;
}

/* ---------- 一行编号目录 ---------- */

.page-about .about-toc {
  margin-top: clamp(30px, 5vw, 58px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-toc-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: max-content;
}

.page-about .about-toc-list li {
  border-right: 1px solid var(--line);
}

.page-about .about-toc-list li:first-child {
  border-left: 1px solid var(--line);
}

.page-about .about-toc-list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 13px 20px;
  font-family: var(--font-index);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--deep);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 190ms var(--ease), color 190ms var(--ease);
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  background: var(--deep);
  color: var(--paper);
  outline: none;
}

.page-about .about-toc-list a:hover .toc-num,
.page-about .about-toc-list a:focus-visible .toc-num {
  color: var(--green);
}

.page-about .toc-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--stone);
  transition: color 190ms var(--ease);
}

/* ---------- 正文骨架 ---------- */

.page-about .about-body {
  padding: 0 0 clamp(40px, 6vw, 88px);
}

.page-about .about-section {
  padding: clamp(36px, 5.5vw, 72px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h, 66px) + 28px);
}

.page-about .about-section:first-child {
  border-top: 0;
}

.page-about .about-row {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
  align-items: start;
}

/* 左侧编号 + 标题轨道 */
.page-about .about-rail {
  grid-column: 1 / span 3;
  position: relative;
  padding-left: var(--about-rail-pad);
}

.page-about .about-rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: var(--line);
  transition: width 220ms var(--ease), background-color 220ms var(--ease);
}

.page-about .about-section.is-current .about-rail::before {
  width: 3px;
  background: var(--green);
}

.page-about .about-num {
  position: absolute;
  left: var(--about-num-offset);
  top: 0;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--clay);
  user-select: none;
}

.page-about .about-h {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 26px);
  line-height: 1.38;
  letter-spacing: -.01em;
  color: var(--deep);
  margin: 0;
}

/* 正文列（奇偶错位） */
.page-about .about-copy {
  grid-column: 4 / span 8;
}

.page-about .about-row--alt .about-copy {
  grid-column: 5 / span 8;
}

.page-about .about-row--split .about-copy {
  grid-column: 4 / span 5;
}

.page-about .about-row--split .about-media {
  grid-column: 10 / span 3;
}

.page-about .about-copy p {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0 0 .95em;
  max-width: 62ch;
}

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

.page-about .about-copy a {
  color: var(--deep);
  text-decoration: none;
  border-bottom: 1px solid var(--green);
  padding-bottom: 1px;
  transition: background-color 170ms var(--ease);
}

.page-about .about-copy a:hover,
.page-about .about-copy a:focus-visible {
  background: rgba(126, 211, 33, .28);
  outline: none;
}

.page-about .about-copy strong {
  font-weight: 600;
  color: var(--deep);
}

.page-about .hl {
  background: linear-gradient(180deg, transparent 58%, rgba(126, 211, 33, .38) 58%);
  padding: 0 2px;
}

/* ---------- 条目列表 ---------- */

.page-about .about-list {
  list-style: none;
  margin: 20px 0 22px;
  padding: 0;
}

.page-about .about-list li {
  position: relative;
  padding: 13px 0 13px 28px;
  border-top: 1px solid var(--line);
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink);
  max-width: 64ch;
}

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

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 20px;
  width: 10px;
  height: 10px;
  background: var(--green);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 58% 100%, 0 100%);
}

.page-about .about-list--clay li::before {
  background: var(--clay);
}

/* ---------- 收录取向流程 ---------- */

.page-about .about-banner {
  margin: 0 0 26px;
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 26px 0;
  border: 1px solid var(--line);
  background: var(--paper);
}

.page-about .flow-node {
  position: relative;
  padding: 18px 16px 20px;
  border-left: 1px solid var(--line);
  transition: background-color 200ms var(--ease);
}

.page-about .flow-node:first-child {
  border-left: 0;
}

.page-about .flow-node:hover,
.page-about .flow-node:focus-within {
  background: rgba(126, 211, 33, .1);
  outline: none;
}

.page-about .flow-node::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line);
  transition: width 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .flow-node:hover::after,
.page-about .flow-node:focus-within::after {
  width: 3px;
  background: var(--green);
}

.page-about .flow-step {
  display: block;
  font-family: var(--font-index);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--moss);
  margin-bottom: 8px;
}

.page-about .flow-name {
  font-family: var(--font-index);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--deep);
  margin: 0;
}

.page-about .flow-note {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 240ms var(--ease), opacity 200ms var(--ease), margin-top 240ms var(--ease);
}

.page-about .flow-node:hover .flow-note,
.page-about .flow-node:focus-within .flow-note {
  max-height: 140px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 麦穗与折线分隔 ---------- */

.page-about .about-divider {
  padding: 0;
  opacity: .9;
}

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

/* ---------- 四阶段 ---------- */

.page-about .about-phases {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  counter-reset: phase;
}

.page-about .about-phases li {
  position: relative;
  padding: 16px 0 16px 22px;
  border-top: 1px solid var(--line);
}

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

.page-about .about-phases li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--paper);
  border: 1px solid var(--clay);
}

.page-about .phase-time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--clay);
  margin-bottom: 5px;
}

.page-about .phase-name {
  font-family: var(--font-index);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--deep);
  margin: 0 0 6px;
}

.page-about .about-phases p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  margin: 0;
  max-width: 56ch;
}

/* ---------- 不做 / 做 对照 ---------- */

.page-about .about-contrast {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap);
  margin: 24px 0 26px;
}

.page-about .contrast-col {
  padding: 18px 18px 20px 20px;
  background: var(--paper);
}

.page-about .contrast-col--no {
  border: 1px solid var(--line);
  border-left: 1px solid var(--stone);
}

.page-about .contrast-col--yes {
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
}

.page-about .contrast-title {
  font-family: var(--font-index);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--deep);
  margin: 0 0 14px;
}

.page-about .contrast-col--no .contrast-title {
  color: var(--stone);
}

.page-about .contrast-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .contrast-col li {
  position: relative;
  padding: 0 0 0 18px;
  margin-bottom: 12px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .contrast-col li:last-child {
  margin-bottom: 0;
}

.page-about .contrast-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background: var(--stone);
}

.page-about .contrast-col--yes li::before {
  height: 3px;
  background: var(--green);
}

.page-about .about-closing {
  padding-top: 8px;
  border-top: 1px solid var(--line);
  margin-top: 4px;
}

/* ---------- 图片容器 ---------- */

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

.page-about .figure-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .figure-caption {
  font-family: var(--font-body);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--stone);
  margin-top: 10px;
  max-width: 42ch;
}

/* ---------- 焦点可见性 ---------- */

.page-about .flow-node:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: -2px;
}

/* ---------- 响应式 ---------- */

@media (max-width: 1100px) {
  .page-about .about-hero-copy {
    grid-column: 1 / span 10;
  }

  .page-about .about-row--split .about-copy {
    grid-column: 4 / span 6;
  }

  .page-about .about-row--split .about-media {
    grid-column: 10 / span 3;
  }

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

  .page-about .flow-node:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .flow-node:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .page-about .flow-node:nth-child(3)::after {
    display: none;
  }
}

@media (max-width: 900px) {
  .page-about {
    --about-rail-pad: 32px;
    --about-num-offset: 10px;
  }

  .page-about .about-hero::after {
    width: 210px;
    height: 150px;
    top: -50px;
    right: -60px;
  }

  .page-about .about-hero-copy {
    grid-column: 1 / -1;
  }

  .page-about .about-hero h1 {
    max-width: 22ch;
  }

  .page-about .about-toc-list a {
    padding: 12px 15px;
  }

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

  .page-about .about-rail,
  .page-about .about-copy,
  .page-about .about-row--alt .about-copy,
  .page-about .about-row--split .about-copy,
  .page-about .about-row--split .about-media,
  .page-about .about-media {
    grid-column: 1 / -1;
  }

  .page-about .about-rail {
    margin-bottom: 20px;
  }

  .page-about .about-media {
    margin-top: 26px;
    max-width: 520px;
  }

  .page-about .about-row--split .about-media {
    margin-top: 26px;
  }

  .page-about .flow-note {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }

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

@media (max-width: 640px) {
  .page-about .about-num {
    font-size: 11px;
    letter-spacing: .14em;
  }

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

  .page-about .flow-node,
  .page-about .flow-node:nth-child(3),
  .page-about .flow-node:nth-child(4) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .flow-node:first-child {
    border-top: 0;
  }

  .page-about .flow-node::after {
    display: none;
  }

  .page-about .about-media {
    max-width: 100%;
  }

  .page-about .contrast-col {
    padding: 16px 14px 18px 16px;
  }
}

/* ---------- 降低动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail::before,
  .page-about .flow-node,
  .page-about .flow-node::after,
  .page-about .flow-note,
  .page-about .about-toc-list a,
  .page-about .toc-num {
    transition-duration: 0ms;
  }

  .page-about .flow-note {
    transition: none;
  }
}
<<<END>>>