.page-about {
  --about-rail-w: 190px;
  --about-ink-text: rgba(242, 234, 217, 0.74);
  padding-bottom: clamp(56px, 8vw, 120px);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 56px) 0 clamp(28px, 4.6vw, 56px);
  border-bottom: 1px solid var(--line-soft);
  background-image:
    radial-gradient(ellipse 58% 74% at 90% 4%, rgba(227, 178, 60, 0.14), transparent 62%),
    radial-gradient(ellipse 46% 60% at 0% 100%, rgba(53, 208, 192, 0.07), transparent 62%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-h1 {
  margin: 12px 0 18px;
  font-size: clamp(29px, 5.4vw, 58px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-lede {
  max-width: 46ch;
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17.5px);
  line-height: 1.85;
  color: var(--about-ink-text);
}

.page-about .about-hero__actions {
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .hero-plates {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .hero-plate {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "tag tag"
    "num note";
  gap: 4px 14px;
  align-items: baseline;
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--gold);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(25, 28, 36, 0.92), rgba(12, 14, 19, 0.92));
}

.page-about .plate-tag {
  grid-area: tag;
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

.page-about .plate-num {
  grid-area: num;
  font-size: clamp(28px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .plate-unit {
  margin-left: 3px;
  font-size: 12px;
  letter-spacing: 0;
  color: var(--gold-pale);
}

.page-about .plate-note {
  grid-area: note;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.6vw, 44px);
  padding-top: clamp(28px, 4.4vw, 52px);
}

.page-about .about-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail .index-link {
  flex: 0 0 auto;
  padding: 7px 13px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  color: var(--stone);
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  text-decoration: none;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .about-rail .index-link:hover,
.page-about .about-rail .index-link.is-active {
  color: var(--gold-pale);
  border-color: rgba(227, 178, 60, 0.55);
  background: rgba(227, 178, 60, 0.08);
}

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

.page-about .about-section {
  padding: clamp(30px, 4.6vw, 54px) 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 20px;
  margin-bottom: clamp(18px, 2.8vw, 30px);
}

.page-about .about-head h2 {
  margin: 0;
  max-width: 24ch;
  font-size: clamp(21px, 3.2vw, 34px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.005em;
}

.page-about .head-idx {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

/* ---------- 时间线 ---------- */

.page-about .tl-figure {
  margin: 0 0 clamp(22px, 3.6vw, 34px);
}

.page-about .tl-figure img {
  width: 100%;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 20px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(227, 178, 60, 0.28) 26%, var(--line-soft) 100%);
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 clamp(16px, 2.4vw, 26px) clamp(26px, 3.4vw, 38px);
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 14px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 2px solid var(--gold);
}

.page-about .tl-node:first-child::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(227, 178, 60, 0.16);
}

.page-about .tl-card {
  padding: clamp(15px, 2.2vw, 22px) clamp(16px, 2.6vw, 26px);
  background: var(--paper);
  color: var(--ink);
  border-left: 3px solid var(--clay);
  border-radius: var(--radius);
  box-shadow: var(--lift);
}

.page-about .tl-era {
  margin: 0 0 6px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-about .tl-card h3 {
  margin: 0 0 8px;
  font-size: clamp(16.5px, 1.9vw, 20px);
  line-height: 1.36;
  font-weight: 800;
  color: var(--ink);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(18, 20, 26, 0.76);
}

/* ---------- 四类服务 ---------- */

.page-about .svc-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 1.8vw, 18px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .svc-item {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(25, 28, 36, 0.92), rgba(12, 14, 19, 0.92));
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.page-about .svc-item:hover {
  transform: translateY(-3px);
  border-color: rgba(227, 178, 60, 0.5);
  box-shadow: var(--lift);
}

.page-about .svc-num {
  position: absolute;
  top: clamp(14px, 2vw, 20px);
  right: clamp(15px, 2vw, 22px);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: rgba(227, 178, 60, 0.26);
}

.page-about .svc-item h3 {
  margin: 0 0 10px;
  padding-right: 46px;
  font-size: clamp(16.5px, 1.9vw, 20px);
  font-weight: 800;
  color: var(--gold-pale);
}

.page-about .svc-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--about-ink-text);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
}

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

.page-about .team-figure img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
}

.page-about .team-lede {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--about-ink-text);
}

.page-about .crew-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .crew-item {
  padding: 14px 16px 15px;
  border-left: 2px solid var(--moss);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(94, 107, 74, 0.18), rgba(18, 20, 26, 0.4));
}

.page-about .crew-item h3 {
  margin: 0 0 5px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--gold-pale);
}

.page-about .crew-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--about-ink-text);
}

.page-about .about-note {
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(16px, 2.4vw, 22px) clamp(16px, 2.6vw, 26px);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(90deg, rgba(110, 31, 26, 0.32), rgba(18, 20, 26, 0.15));
}

.page-about .about-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--gold-pale);
}

/* ---------- 覆盖与规模 ---------- */

.page-about .scale-lede {
  max-width: 52ch;
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--about-ink-text);
}

.page-about .stat-strip {
  padding: clamp(20px, 3.2vw, 38px);
  border: 1px solid rgba(227, 178, 60, 0.26);
  border-radius: var(--radius);
  background:
    radial-gradient(ellipse 62% 100% at 10% 0%, rgba(196, 30, 40, 0.26), transparent 62%),
    linear-gradient(160deg, #1b1d25 0%, var(--ink-deep) 100%);
}

.page-about .cover-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .cover-stat {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .cover-num {
  display: block;
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .cover-unit {
  margin-left: 4px;
  font-size: 0.4em;
  letter-spacing: 0;
  color: var(--gold-pale);
}

.page-about .cover-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.62;
  color: var(--about-ink-text);
}

.page-about .pulse-line {
  display: block;
  width: 100%;
  height: 34px;
  margin-top: clamp(18px, 3vw, 28px);
  color: rgba(53, 208, 192, 0.55);
}

/* ---------- 合作生态 ---------- */

.page-about .partner-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .partner-figure {
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid rgba(227, 178, 60, 0.3);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(110, 31, 26, 0.42), rgba(18, 20, 26, 0.6));
}

.page-about .partner-figure .cover-num {
  color: var(--gold-pale);
}

.page-about .partner-text p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-ink-text);
}

.page-about .partner-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 归属与联系 ---------- */

.page-about .contact-block {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .origin-line {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-ink-text);
}

.page-about .origin-line .mono {
  color: var(--gold-pale);
}

.page-about .contact-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .contact-item {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(25, 28, 36, 0.72);
}

.page-about .contact-label {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--stone);
}

.page-about .contact-value {
  font-size: clamp(14.5px, 1.6vw, 16.5px);
  font-weight: 700;
  color: var(--paper);
  word-break: break-word;
}

.page-about .contact-note {
  font-size: 12.5px;
  line-height: 1.66;
  color: var(--stone);
}

.page-about .about-cta {
  margin: 0;
  padding: clamp(16px, 2.4vw, 22px) clamp(16px, 2.6vw, 24px);
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(53, 208, 192, 0.07);
  font-size: 14px;
  line-height: 1.9;
  color: var(--about-ink-text);
}

.page-about .about-cta a {
  color: var(--gold-pale);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.page-about .city-figure {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
}

.page-about .city-figure img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .crew-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .contact-item:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 760px) {
  .page-about .svc-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .cover-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .partner-split {
    grid-template-columns: minmax(220px, 0.62fr) minmax(0, 1.38fr);
    align-items: start;
  }

  .page-about .partner-figure {
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(268px, 0.6fr);
    align-items: end;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
    gap: clamp(30px, 3.6vw, 58px);
  }

  .page-about .about-rail {
    display: grid;
    gap: 0;
    overflow: visible;
    position: sticky;
    top: 96px;
    align-content: start;
    padding-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .about-rail .index-link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    padding: 9px 0 9px 14px;
    font-size: 13px;
    color: var(--stone);
    background: transparent;
  }

  .page-about .about-rail .index-link:hover {
    color: var(--gold-pale);
    border-left-color: rgba(227, 178, 60, 0.4);
    background: transparent;
  }

  .page-about .about-rail .index-link.is-active {
    color: var(--gold-pale);
    border-left-color: var(--gold);
    background: linear-gradient(90deg, rgba(227, 178, 60, 0.12), transparent 74%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .svc-item {
    transition: none;
  }

  .page-about .svc-item:hover {
    transform: none;
  }
}