.page-about {
  --about-card-bg: rgba(242, 245, 247, 0.035);
  --about-num-color: rgba(200, 245, 66, 0.9);
  --about-aside-line: rgba(0, 229, 255, 0.28);
  --about-border-line: rgba(0, 229, 255, 0.2);
  background: var(--color-bg);
  color: var(--color-white);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
}

.page-about .container {
  max-width: var(--container);
  padding-inline: clamp(1.1rem, 4vw, 3rem);
  margin-inline: auto;
  box-sizing: border-box;
}

/* ---------- 封面区 ---------- */
.page-about .about-cover {
  position: relative;
  padding: 2.25rem 0 3.5rem;
  border-top: 4px solid var(--color-cyan);
  border-bottom: 1px solid var(--about-border-line);
  background:
    linear-gradient(135deg, transparent 0%, rgba(42, 19, 74, 0.36) 100%),
    var(--color-bg);
}

.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: clamp(2.5rem, 7vw, 4.5rem);
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--color-gray);
}

.page-about .about-breadcrumb a {
  color: var(--color-cyan);
  text-decoration: none;
}

.page-about .about-breadcrumb a:hover {
  text-decoration: underline;
}

.page-about .about-cover--inner {
  display: grid;
  gap: 2.5rem;
  align-items: end;
}

.page-about .about-cover--kicker {
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-cyan);
  margin-bottom: 1rem;
}

.page-about .about-cover h1 {
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 7vw, 5.6rem);
  line-height: 1.1;
  letter-spacing: 0.01em;
  margin: 0 0 1.5rem;
  max-width: 30ch;
  color: var(--color-white);
}

.page-about .about-cover--lede {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--color-gray);
  max-width: 44em;
}

.page-about .about-cover--meta {
  display: grid;
  gap: 1px;
  background: var(--about-aside-line);
  border: 1px solid var(--about-aside-line);
  grid-template-columns: 1fr;
}

.page-about .about-cover--meta-item {
  background: var(--color-bg);
  padding: 1rem 1.25rem;
}

.page-about .about-cover--meta-item .meta-year {
  display: block;
  font-family: var(--font-data);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-acid);
}

.page-about .about-cover--meta-item .meta-label {
  font-size: 0.82rem;
  color: var(--color-gray);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(3.5rem, 8vw, 7rem) 0;
  border-bottom: 1px solid var(--about-border-line);
}

.page-about .about-chapter--wine {
  background: var(--color-wine);
}

.page-about .about-chapter--indigo {
  background: var(--color-indigo);
}

.page-about .about-chapter--grid {
  display: grid;
  gap: 1.75rem 2rem;
  align-items: start;
}

.page-about .about-chapter--num {
  grid-column: 1 / -1;
  font-family: var(--font-data);
  font-size: 3rem;
  line-height: 1;
  color: var(--about-num-color);
  letter-spacing: -0.02em;
}

.page-about .about-chapter--content {
  min-width: 0;
}

/* ---------- 章节标题 ---------- */
.page-about .section-head {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 2rem;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 3.4rem);
  line-height: 1.12;
  margin: 0;
  color: var(--color-white);
}

.page-about .section-kicker {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-cyan);
}

.page-about .lede {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--color-gray);
  max-width: 44em;
  margin: 0 0 2.25rem;
}

/* ---------- 01 品牌故事 ---------- */
.page-about .about-story-layout {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.page-about .about-story-copy p {
  margin: 0 0 1.1rem;
  color: var(--color-gray);
  font-size: 0.97rem;
  line-height: 1.75;
}

.page-about .about-story-copy p:first-child {
  color: var(--color-white);
  font-size: 1.02rem;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--about-aside-line);
  border: 1px solid var(--about-aside-line);
  margin: 0;
}

.page-about .fact-item {
  background: var(--color-bg);
  padding: 1rem 1.25rem;
}

.page-about .fact-item dt {
  font-size: 0.78rem;
  color: var(--color-gray);
}

.page-about .fact-item dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-acid);
}

/* ---------- 02 平台里程碑 ---------- */
.page-about .about-milestone-layout {
  display: grid;
  gap: 2rem;
}

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

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--color-cyan);
  opacity: 0.45;
}

.page-about .timeline-item {
  position: relative;
  padding-left: 2rem;
  padding-bottom: 2.2rem;
}

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

.page-about .timeline-dot {
  position: absolute;
  left: 0;
  top: 0.35rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-acid);
  box-shadow: 0 0 0 4px rgba(200, 245, 66, 0.16);
}

.page-about .timeline-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.3;
  margin: 0 0 0.45rem;
  color: var(--color-white);
}

.page-about .timeline-card p {
  margin: 0;
  color: var(--color-gray);
  font-size: 0.94rem;
  line-height: 1.65;
}

.page-about .about-milestone-figure,
.page-about .about-scale-figure,
.page-about .about-compliance-figure {
  margin: 0;
  padding: 0.5rem;
  border: 1px solid var(--about-aside-line);
  background: var(--about-card-bg);
}

.page-about .about-milestone-figure img,
.page-about .about-scale-figure img,
.page-about .about-compliance-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-milestone-figure img {
  aspect-ratio: 4 / 3;
}

.page-about .about-milestone-figure figcaption,
.page-about .about-scale-figure figcaption,
.page-about .about-compliance-figure figcaption {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gray);
  padding: 0.6rem 0.25rem 0.1rem;
}

.page-about .about-milestone-note {
  margin: 2rem 0 0;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--color-acid);
  background: rgba(242, 245, 247, 0.03);
  color: var(--color-gray);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ---------- 03 数据服务规模 ---------- */
.page-about .about-scale-content {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-scale-grid {
  display: grid;
  gap: 1.25rem;
}

.page-about .scale-item {
  padding: 1.5rem;
  border-left: 3px solid var(--color-cyan);
  background: var(--about-card-bg);
}

.page-about .scale-item--main {
  border-left-color: var(--color-acid);
}

.page-about .scale-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-acid);
  letter-spacing: -0.02em;
}

.page-about .scale-num em {
  font-style: normal;
  font-size: 0.38em;
  vertical-align: middle;
  margin-left: 0.08em;
  color: var(--color-cyan);
  letter-spacing: 0;
}

.page-about .scale-label {
  display: block;
  margin-top: 0.75rem;
  font-size: 1rem;
  color: var(--color-white);
  line-height: 1.3;
}

.page-about .scale-note {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.8rem;
  color: var(--color-gray);
  line-height: 1.5;
}

.page-about .about-scale-bottom {
  display: grid;
  gap: 1.25rem;
}

/* ---------- 04 移动端访问问题解决 ---------- */
.page-about .about-fix-layout {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

.page-about .fix-card {
  position: relative;
  padding: 1.75rem 1.5rem;
  background: var(--about-card-bg);
  border-top: 1px solid var(--about-aside-line);
  border-bottom: 1px solid var(--about-aside-line);
}

.page-about .fix-card h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 0 0 0.75rem;
  color: var(--color-white);
}

.page-about .fix-card p {
  margin: 0 0 1rem;
  color: var(--color-gray);
  font-size: 0.95rem;
  line-height: 1.65;
}

.page-about .fix-card .tag {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-cyan);
  border: 1px solid var(--about-aside-line);
  padding: 0.25rem 0.6rem;
}

.page-about .about-fix-pack {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--color-bg);
  border-left: 3px solid var(--color-acid);
}

.page-about .about-fix-pack p {
  margin: 0 0 0.75rem;
  color: var(--color-gray);
  font-size: 0.94rem;
  line-height: 1.7;
}

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

.page-about .about-fix-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

/* ---------- 05 资质与合规 ---------- */
.page-about .about-compliance-layout {
  display: grid;
  gap: 2rem;
  align-items: start;
}

.page-about .about-compliance-figure img {
  aspect-ratio: 1 / 1;
}

.page-about .about-compliance-list {
  display: grid;
  gap: 1.25rem;
}

.page-about .compliance-item {
  padding: 1.5rem 1.25rem;
  border-left: 3px solid var(--color-acid);
  background: var(--about-card-bg);
}

.page-about .compliance-item h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  line-height: 1.3;
  margin: 0 0 0.5rem;
  color: var(--color-white);
}

.page-about .compliance-item p {
  margin: 0;
  color: var(--color-gray);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ---------- 响应式：平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-cover--meta {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-milestone-figure,
  .page-about .about-scale-figure {
    max-width: 680px;
  }

  .page-about .about-scale-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
  }

  .page-about .about-scale-bottom {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.25rem;
  }

  .page-about .about-fix-layout {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .page-about .about-fix-pack p {
    max-width: 72ch;
  }
}

/* ---------- 响应式：桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-cover--inner {
    grid-template-columns: 1fr 320px;
    gap: 3rem;
  }

  .page-about .about-cover--meta {
    grid-template-columns: 1fr;
    transform: translateY(2.5rem);
  }

  .page-about .about-chapter--grid {
    grid-template-columns: clamp(90px, 11vw, 180px) 1fr;
    gap: 3.5rem;
  }

  .page-about .about-chapter--num {
    grid-column: 1;
    grid-row: 1;
    font-size: clamp(4rem, 8vw, 7.5rem);
    position: sticky;
    top: 2rem;
    padding-right: 1rem;
    border-right: 3px solid var(--color-cyan);
    opacity: 0.95;
  }

  .page-about .about-chapter--wine .about-chapter--num {
    border-right-color: var(--color-acid);
  }

  .page-about .about-chapter--content {
    min-width: 0;
  }

  .page-about .about-story-layout {
    grid-template-columns: 1.4fr 1fr;
    gap: 3rem;
  }

  .page-about .about-milestone-layout {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3rem;
  }

  .page-about .about-milestone-figure {
    max-width: none;
  }

  .page-about .about-scale-content {
    gap: 2rem;
  }

  .page-about .about-scale-figure {
    max-width: none;
  }

  .page-about .about-compliance-layout {
    grid-template-columns: 330px 1fr;
    gap: 3rem;
  }

  .page-about .about-compliance-figure {
    max-width: 340px;
  }

  .page-about .fix-card--special {
    transform: translateY(2rem);
  }
}