/* ============================================================
   页面作用域：品牌与版本说明 /values/
   ============================================================ */

.page-about {
  --about-index-w: 220px;
  background: var(--obsidian);
  color: var(--paper);
  padding-bottom: clamp(64px, 9vw, 112px);
}

.page-about .breadcrumb {
  padding-block: 20px 0;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-block: 20px clamp(40px, 6vw, 68px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--ink-line);
  background: linear-gradient(155deg, #151a21 0%, #0b0e13 78%);
  padding: clamp(52px, 6vw, 76px) clamp(22px, 4.5vw, 56px) clamp(30px, 4vw, 48px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background-image: repeating-linear-gradient(90deg, var(--ink-line) 0 1px, transparent 1px 22px);
  opacity: 0.75;
  pointer-events: none;
}

.page-about .about-hero__corner {
  position: absolute;
  top: -1px;
  left: -1px;
  display: inline-block;
  padding: 5px 12px;
  background: var(--amber);
  color: var(--obsidian);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  line-height: 1.5;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(28px, 5.4vw, 44px);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.01em;
  margin: 12px 0 18px;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 40em;
}

.page-about .about-hero__stamp {
  border: 1px solid var(--ink-line);
  background: rgba(21, 26, 33, 0.72);
  padding: 20px 22px 18px;
}

.page-about .about-hero__stamp-label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.page-about .about-hero__stamp-value {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: clamp(40px, 7vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .about-hero__meta {
  margin: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-hero__meta-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  border-top: 1px solid var(--line-soft);
  padding-top: 9px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-hero__meta-row dd {
  margin: 0;
  font-family: var(--font-mono);
  color: var(--paper);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 0;
}

.page-about .about-index {
  margin-bottom: 36px;
  min-width: 0;
}

.page-about .about-index__inner {
  position: static;
}

.page-about .about-index__label {
  margin: 0 0 14px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px 9px 12px;
  font-size: 14px;
  line-height: 1.45;
  color: var(--mist);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-index__link:hover {
  color: var(--paper);
  background: rgba(217, 164, 65, 0.06);
}

.page-about .about-index__link.is-active {
  color: var(--gold);
  border-left-color: var(--amber);
  background: rgba(217, 164, 65, 0.08);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(169, 180, 196, 0.55);
}

.page-about .about-index__link.is-active .about-index__num {
  color: var(--amber);
}

.page-about .about-main {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: clamp(32px, 4.5vw, 52px);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .about-section__title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(21px, 2.8vw, 27px);
  line-height: 1.45;
  letter-spacing: 0.01em;
  margin: 0 0 18px;
  color: var(--paper);
}

.page-about .about-section__title::before {
  content: "";
  display: block;
  width: 24px;
  height: 2px;
  background: var(--amber);
  margin-bottom: 14px;
}

.page-about .about-section__sub {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: var(--paper);
  margin: 28px 0 10px;
}

.page-about .about-section p {
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.8);
  margin: 0 0 14px;
  max-width: 38em;
}

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

/* ---------- 图片容器 ---------- */
.page-about .figure {
  margin: 26px 0;
}

.page-about .figure__frame {
  border: 1px solid var(--ink-line);
  background: var(--carbon);
  overflow: hidden;
}

.page-about .figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--mist);
  line-height: 1.7;
}

.page-about .about-figure {
  margin-top: 22px;
}

/* ---------- 三条版本线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: 10px 0 8px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-line {
  background: var(--carbon);
  padding: 22px 22px 24px;
}

.page-about .about-line__no {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-line__name {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .about-lines .about-line p {
  margin: 0;
  max-width: none;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.72);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--amber) 0%, var(--ink-line) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px 28px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__node {
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--obsidian);
  border: 1px solid var(--amber);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-timeline__item:hover .about-timeline__node {
  background: var(--amber);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.2vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--amber);
  margin: 0 0 8px;
  max-width: none;
}

.page-about .about-timeline__title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .about-timeline__detail {
  margin-top: 4px;
}

.page-about .disclosure__summary {
  cursor: pointer;
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  list-style: none;
  transition: color 0.18s ease;
}

.page-about .disclosure__summary::-webkit-details-marker {
  display: none;
}

.page-about .disclosure__summary::after {
  content: "+";
  margin-left: 8px;
  color: var(--amber);
  font-family: var(--font-mono);
}

.page-about .disclosure[open] .disclosure__summary::after {
  content: "−";
}

.page-about .disclosure__summary:hover {
  color: var(--gold);
}

.page-about .disclosure__body {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 1px solid var(--line-soft);
}

.page-about .disclosure__body p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.72);
  margin: 0;
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 22px 0 28px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-stats__item {
  background: var(--carbon);
  padding: 20px 18px;
  display: grid;
  gap: 6px;
  min-width: 0;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--gold);
}

.page-about .about-stats__label {
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  border: 1px solid var(--ink-line);
  background: var(--carbon);
  padding: 22px;
}

.page-about .about-team .about-section__sub {
  margin-top: 0;
}

.page-about .about-team p {
  margin: 0;
  max-width: none;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.72);
}

/* ---------- 资质网格 ---------- */
.page-about .about-creds {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-creds__item {
  position: relative;
  background: var(--carbon);
  padding: 22px 22px 24px;
  transition: background-color 0.2s ease;
}

.page-about .about-creds__item::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid transparent;
  transition: border-color 0.2s ease;
  pointer-events: none;
}

.page-about .about-creds__item:hover {
  background: #1b2129;
}

.page-about .about-creds__item:hover::before {
  border-color: var(--amber);
}

.page-about .about-creds__no {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-creds__title {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.65;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .about-creds__meta {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  margin: 22px 0 22px;
}

.page-about .about-partners__item {
  background: var(--carbon);
  padding: 22px;
}

.page-about .about-partners__item .about-section__sub {
  margin-top: 0;
}

.page-about .about-partners__item p {
  margin: 0;
  max-width: none;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.72);
}

/* ---------- 获取资料 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--amber);
  padding-top: 3px;
}

.page-about .about-steps__item p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-cta {
  display: grid;
  gap: 18px;
  margin-top: 32px;
  padding: 24px clamp(18px, 3vw, 28px);
  border: 1px solid var(--ink-line);
  background: linear-gradient(135deg, rgba(217, 164, 65, 0.1) 0%, rgba(11, 14, 19, 0) 62%);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 241, 234, 0.82);
}

.page-about .about-foot-links {
  margin-top: 22px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 40em;
}

/* ---------- 窄屏适配 ---------- */
@media (max-width: 1023px) {
  .page-about .about-index__list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 6px;
    overflow-x: auto;
    padding-bottom: 8px;
    scrollbar-width: thin;
  }

  .page-about .about-index__link {
    white-space: nowrap;
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 8px 12px;
  }

  .page-about .about-index__link.is-active {
    border-left: none;
    border-bottom-color: var(--amber);
  }
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 720px) {
  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-split--tight {
    gap: 1px;
    background: var(--line-soft);
    border: 1px solid var(--line-soft);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: clamp(32px, 5vw, 72px);
    align-items: end;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
  }

  .page-about .about-index {
    margin-bottom: 0;
    border-right: 1px solid var(--line-soft);
    padding-right: 26px;
  }

  .page-about .about-index__inner {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-main {
    padding-left: clamp(32px, 4vw, 56px);
  }

  .page-about .about-section:first-child {
    padding-top: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-creds__item,
  .page-about .about-creds__item::before,
  .page-about .about-timeline__node,
  .page-about .disclosure__summary {
    transition: none;
  }
}
<<<END>>>