/* ===== 品牌中心 · 页面作用域 ===== */
.page-about {
  --about-axis: 34px;
  --about-rhythm: clamp(44px, 6.5vw, 92px);
  display: block;
  background: var(--ink);
  color: var(--silver);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(48px, 7.5vw, 104px);
  border-bottom: var(--line);
  background:
    radial-gradient(118% 86% at 86% 0%, rgba(255, 176, 32, 0.13), transparent 58%),
    radial-gradient(96% 74% at 4% 106%, rgba(47, 212, 234, 0.10), transparent 64%),
    linear-gradient(158deg, #14181F 0%, #0B0D10 66%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(43, 50, 59, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43, 50, 59, 0.42) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.1) 78%, transparent);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.1) 78%, transparent);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__tag {
  display: none;
  margin: 0;
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(18px, 3vw, 34px);
}

.page-about .about-hero__title {
  margin: clamp(12px, 1.8vw, 20px) 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.4vw, 4.1rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 56ch;
  font-size: clamp(0.98rem, 1.2vw, 1.0625rem);
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--silver);
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(28px, 4.4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--hairline);
}

.page-about .about-figure {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(14px, 2vw, 22px) clamp(14px, 2.2vw, 24px);
  background: linear-gradient(172deg, #1C222B 0%, #14181F 100%);
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 2.6vw, 2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-figure__label {
  font-size: 0.8125rem;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 通用区块 ---------- */
.page-about .section {
  padding: var(--about-rhythm) 0;
  border-top: var(--line);
}

.page-about .about-hero + .section {
  border-top: 0;
}

.page-about .about-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(28px, 4.5vw, 52px);
}

.page-about .about-head__no {
  display: inline-block;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.8vw, 2.3rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-head__summary {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 01 我们做什么 ---------- */
.page-about .pillars {
  display: grid;
  gap: 1px;
  border: var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--hairline);
}

.page-about .pillar {
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--slate);
  transition: background var(--ease);
}

.page-about .pillar:hover {
  background: var(--graphite);
}

.page-about .pillar__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .pillar__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .pillar__text {
  margin: 10px 0 0;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 02 版本时间轴 ---------- */
.page-about .tl {
  position: relative;
  padding-left: var(--about-axis);
  background-image: linear-gradient(var(--hairline), var(--hairline));
  background-repeat: no-repeat;
  background-size: 1px 100%;
  background-position: 6px 0;
}

.page-about .tl-node {
  position: relative;
  padding-bottom: clamp(30px, 4.5vw, 54px);
}

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

.page-about .tl-node__dot {
  position: absolute;
  left: calc(-1 * var(--about-axis));
  top: 5px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--hairline);
  background: var(--ink);
  transition: background var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.page-about .tl-node.is-active .tl-node__dot,
.page-about .tl-node:hover .tl-node__dot {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 176, 32, 0.14);
}

.page-about .tl-node__ver {
  display: inline-block;
  margin: 0;
  padding: 2px 8px;
  border: 1px solid var(--amber-deep);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--amber);
  background: rgba(255, 176, 32, 0.06);
}

.page-about .tl-node__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.6vw, 1.35rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .tl-node__text {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .tl-node__impact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 14px 0 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .tl-figure {
  margin: 0 0 clamp(30px, 4.5vw, 54px);
}

.page-about .tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--line);
  border-radius: var(--radius);
  object-fit: cover;
  background: linear-gradient(160deg, #14181F, #0B0D10);
}

.page-about .tl-figure figcaption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 03 服务网络 ---------- */
.page-about .net-figure {
  margin: 0 0 clamp(22px, 3vw, 34px);
}

.page-about .net-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--line);
  border-radius: var(--radius);
  object-fit: cover;
  background: linear-gradient(160deg, #14181F, #0B0D10);
}

.page-about .net-figure figcaption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .city-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1px;
  border: var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--hairline);
}

.page-about .city-rail__item {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px 14px 15px 20px;
  background: var(--slate);
  transition: transform var(--ease), background var(--ease);
}

.page-about .city-rail__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--amber);
  transform: translateY(-50%);
  transition: height var(--ease);
}

.page-about .city-rail__item:hover,
.page-about .city-rail__item:focus-visible {
  background: var(--graphite);
  transform: translateY(-1px);
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan);
}

.page-about .city-rail__item:hover::before,
.page-about .city-rail__item:focus-visible::before {
  height: 58%;
}

.page-about .city-rail__no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .city-rail__name {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--silver);
}

.page-about .net-notes {
  display: grid;
  gap: 1px;
  margin-top: clamp(18px, 2.6vw, 30px);
  border: var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--hairline);
}

.page-about .net-note {
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--ink);
}

.page-about .net-note__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .net-note__t {
  margin: 10px 0 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .net-note__d {
  margin: 8px 0 0;
  font-size: 0.9063rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 04 团队 ---------- */
.page-about .team-deck {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .team-card {
  border: var(--line);
  border-radius: var(--radius);
  background: var(--slate);
  padding: clamp(18px, 2.2vw, 26px);
  transition: border-color var(--ease), background var(--ease);
}

.page-about .team-card[open] {
  background: var(--graphite);
  border-color: rgba(255, 176, 32, 0.28);
}

.page-about .team-card > summary {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-right: 30px;
  cursor: pointer;
  list-style: none;
}

.page-about .team-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .team-card > summary::after {
  content: "+";
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--amber);
}

.page-about .team-card[open] > summary::after {
  content: "\2212";
}

.page-about .team-card > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .team-card__size {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--amber);
}

.page-about .team-card__name {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-card__body {
  margin-top: 14px;
  padding-top: 14px;
  border-top: var(--line);
}

.page-about .team-card__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .team-card__body ul {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .team-card__body li {
  position: relative;
  padding-left: 16px;
  font-size: 0.9063rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .team-card__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

.page-about .team-figure {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--line);
  border-radius: var(--radius);
  object-fit: cover;
  background: linear-gradient(160deg, #14181F, #0B0D10);
}

.page-about .team-figure figcaption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 05 协作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: clamp(18px, 3vw, 36px);
}

.page-about .eco-copy p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--silver);
}

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

.page-about .eco-panel {
  padding: clamp(18px, 2.4vw, 28px);
  border: var(--line);
  border-radius: var(--radius);
  background: linear-gradient(168deg, #1C222B 0%, #14181F 100%);
}

.page-about .eco-panel__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .eco-chain {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  border-top: var(--line);
}

.page-about .eco-chain li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: var(--line);
  font-size: 0.9063rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .eco-chain li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .eco-chain__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(38px, 5.5vw, 76px) 0;
  border-top: var(--line);
  background:
    radial-gradient(92% 130% at 8% 0%, rgba(47, 212, 234, 0.10), transparent 62%),
    linear-gradient(150deg, #14181F 0%, #0B0D10 72%);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.3vw, 1.85rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 66ch;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .net-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-head {
    grid-template-columns: 108px minmax(0, 1fr);
    column-gap: clamp(20px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-head__no {
    padding-top: 0.4em;
  }

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

  .page-about .team-deck {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .team-card--offset-1 {
    margin-top: 26px;
  }

  .page-about .team-card--offset-2 {
    margin-top: 52px;
  }

  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .team-figure {
    max-width: 62%;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__tag {
    display: block;
    position: absolute;
    top: 44%;
    right: 8px;
    margin: 0;
    transform: rotate(-90deg);
    transform-origin: right center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.3em;
    white-space: nowrap;
    color: var(--mist);
    pointer-events: none;
  }

  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .tl {
    --about-axis: 52px;
  }

  .page-about .tl-figure {
    padding-left: clamp(0px, 2vw, 28px);
  }
}

@media (max-width: 560px) {
  .page-about .city-rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .pillar,
  .page-about .city-rail__item,
  .page-about .city-rail__item::before,
  .page-about .tl-node__dot,
  .page-about .team-card {
    transition: none;
  }

  .page-about .city-rail__item:hover,
  .page-about .city-rail__item:focus-visible {
    transform: none;
  }
}
<<<END>>>