.page-about {
  --about-rail: 208px;
  --about-gap: 52px;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 52px) 0 clamp(26px, 4vw, 56px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -6%;
  width: min(560px, 72vw);
  height: min(560px, 72vw);
  background: radial-gradient(circle at 58% 42%, rgba(255, 122, 47, .16), rgba(43, 196, 216, .08) 46%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 44px);
  align-items: center;
  margin-top: clamp(18px, 2.6vw, 30px);
}
.page-about .about-hero h1 {
  margin: 14px 0 18px;
}
.page-about .about-lede {
  margin: 0 0 14px;
  max-width: 22em;
  font-size: var(--fs-20);
  line-height: 1.75;
  color: var(--paper-soft);
}
.page-about .about-lede-sub {
  margin: 0;
  max-width: 26em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--mist);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-800);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
  }
}

/* ---------- 竖轨 + 内容流 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.6vw, 44px);
  padding-bottom: clamp(48px, 7vw, 96px);
}
.page-about .about-stream {
  min-width: 0;
}
.page-about .rail-title {
  margin: 0 0 10px;
  font-family: var(--f-serif);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--mist-dim);
}
.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .rail-list::-webkit-scrollbar {
  display: none;
}
.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  color: var(--mist);
  text-decoration: none;
  font-size: var(--fs-14);
  white-space: nowrap;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}
.page-about .rail-link:hover {
  color: var(--paper);
  border-color: var(--orange);
}
.page-about .rail-link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
  color: var(--paper);
}
.page-about .rail-num {
  font-size: var(--fs-12);
  color: var(--amber);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }
  .page-about .about-rail {
    position: sticky;
    top: 108px;
    align-self: start;
  }
  .page-about .rail-title {
    margin-bottom: 16px;
  }
  .page-about .rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }
  .page-about .rail-item {
    position: relative;
  }
  .page-about .rail-link {
    display: flex;
    padding: 11px 0 11px 22px;
    border: 0;
    border-radius: 0;
    background: none;
    white-space: normal;
    line-height: 1.5;
  }
  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 17px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--line);
    transition: background .2s var(--ease), box-shadow .2s var(--ease);
  }
  .page-about .rail-link:hover::before,
  .page-about .rail-link:focus-visible::before {
    background: var(--orange);
    box-shadow: 0 0 0 5px rgba(255, 122, 47, .16);
  }
}

/* ---------- 内容块 ---------- */
.page-about .ablock {
  padding-block: clamp(26px, 3.4vw, 46px);
  border-top: 1px solid var(--line);
}
.page-about .ablock:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .ablock-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  margin-bottom: 14px;
}
.page-about .ablock-num {
  font-size: var(--fs-14);
  letter-spacing: .08em;
  color: var(--amber);
}
.page-about .ablock-head h2 {
  margin: 0;
  font-family: var(--f-display);
  font-size: var(--fs-26);
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .ablock-lede {
  margin: 0;
  max-width: 42em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--mist);
}
.page-about .ablock .prose p + p {
  margin-top: 14px;
}

/* ---------- 团队卡片 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 22px;
}
.page-about .team-card {
  padding: 20px 18px 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--ink-800);
  transition: transform .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}
.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-3px);
  border-color: var(--orange);
  background: var(--ink-750);
}
.page-about .team-num {
  display: block;
  font-size: var(--fs-48);
  line-height: 1;
  color: var(--amber);
}
.page-about .team-card h3 {
  margin: 10px 0 6px;
  font-family: var(--f-serif);
  font-size: var(--fs-20);
  font-weight: 600;
  color: var(--paper);
}
.page-about .team-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
}
.page-about .team-role {
  color: var(--orange) !important;
  font-size: var(--fs-12) !important;
  letter-spacing: .04em;
  margin-bottom: 8px !important;
}
@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 配图 ---------- */
.page-about .ablock-figure {
  margin: 26px 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-800);
}
.page-about .ablock-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ablock-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--mist-dim);
}

/* ---------- 归档树 ---------- */
.page-about .tree {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .tree-node {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--ink-800);
}
.page-about .tree-count {
  font-size: var(--fs-26);
  line-height: 1.1;
  color: var(--green);
}
.page-about .tree-node h3 {
  margin: 0 0 6px;
  font-family: var(--f-display);
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--paper);
}
.page-about .tree-node p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
}
.page-about .tree-sub {
  list-style: none;
  margin: 10px 0 0;
  padding: 0 0 0 14px;
  border-left: 2px solid var(--line);
  display: grid;
  gap: 6px;
}
.page-about .tree-sub li {
  position: relative;
  padding-left: 12px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--mist-dim);
}
.page-about .tree-sub li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line);
}

/* ---------- 规模数字 ---------- */
.page-about .fact-strip {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.page-about .fact-strip li {
  padding: 14px 12px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(18, 38, 58, .62);
}
.page-about .fact-strip .num {
  display: block;
  margin-bottom: 4px;
  font-size: var(--fs-20);
  color: var(--paper);
}
.page-about .fact-strip li > span:last-child {
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--mist-dim);
}

/* ---------- 三道工序（破格宽幅） ---------- */
.page-about .ablock--bleed {
  padding: 28px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    radial-gradient(130% 100% at 26% 0%, rgba(63, 191, 111, .11), transparent 62%),
    var(--ink-800);
}
.page-about .ablock--bleed .ablock-head h2 {
  color: var(--paper);
}
.page-about .flow-rail {
  position: relative;
  height: 16px;
  margin: 26px 0 20px;
  display: none;
}
.page-about .flow-line {
  position: absolute;
  left: 0;
  top: 6px;
  width: 100%;
  height: 2px;
}
.page-about .ft-line {
  stroke: var(--line);
  stroke-width: 2;
}
.page-about .flow-dot {
  position: absolute;
  top: 2px;
  width: 10px;
  height: 10px;
  margin-left: -5px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 5px rgba(63, 191, 111, .14);
}
.page-about .flow-dot:nth-child(2) {
  left: 16.6667%;
}
.page-about .flow-dot:nth-child(3) {
  left: 50%;
}
.page-about .flow-dot:nth-child(4) {
  left: 83.3333%;
}
.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.page-about .flow-step {
  padding-left: 14px;
  border-left: 2px solid rgba(63, 191, 111, .34);
}
.page-about .flow-step-num {
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--green);
}
.page-about .flow-step h3 {
  margin: 6px 0 8px;
  font-family: var(--f-serif);
  font-size: var(--fs-20);
  font-weight: 600;
  color: var(--paper);
}
.page-about .flow-step p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
}
@media (min-width: 820px) {
  .page-about .flow-rail {
    display: block;
  }
  .page-about .flow-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
  .page-about .flow-step {
    padding-left: 0;
    border-left: 0;
  }
}
@media (min-width: 1000px) {
  .page-about .ablock--bleed {
    margin-left: calc(-1 * (var(--about-rail) + var(--about-gap)));
    width: calc(100% + var(--about-rail) + var(--about-gap));
    padding: clamp(32px, 4vw, 56px) 30px clamp(32px, 4vw, 56px) calc(var(--about-rail) + var(--about-gap) + 28px);
    border-radius: var(--r-xl);
  }
}

/* ---------- 合作与联系 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 22px;
}
.page-about .partner-card {
  padding: 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--ink-800);
  transition: border-color .18s var(--ease);
}
.page-about .partner-card:hover,
.page-about .partner-card:focus-within {
  border-color: var(--orange);
}
.page-about .partner-card h3 {
  margin: 0 0 8px;
  font-family: var(--f-serif);
  font-size: var(--fs-20);
  font-weight: 600;
  color: var(--paper);
}
.page-about .partner-card p {
  margin: 0 0 12px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
}
.page-about .partner-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-14);
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .16s var(--ease);
}
.page-about .partner-link:hover,
.page-about .partner-link:focus-visible {
  border-bottom-color: var(--orange);
}
.page-about .partner-link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}
@media (min-width: 860px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .contact-box {
  margin-top: 24px;
  padding: 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  background: var(--ink-800);
}
.page-about .contact-box h3 {
  margin: 0 0 10px;
  font-family: var(--f-display);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--paper);
}
.page-about .contact-box > p {
  margin: 0;
  max-width: 44em;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
}
.page-about .contact-lines {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .contact-lines li {
  display: grid;
  grid-template-columns: 5.2em minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}
.page-about .contact-lines li > span {
  font-size: var(--fs-12);
  color: var(--mist-dim);
}
.page-about .contact-lines strong {
  font-weight: 500;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}
.page-about .contact-more {
  margin: 16px 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
}
.page-about .contact-more a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 185, 66, .4);
}
.page-about .contact-more a:hover,
.page-about .contact-more a:focus-visible {
  border-bottom-color: var(--amber);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .partner-card,
  .page-about .rail-link,
  .page-about .rail-link::before,
  .page-about .partner-link {
    transition: none;
  }
  .page-about .team-card:hover {
    transform: none;
  }
}