.page-about {
  --about-panel-line: rgba(255, 255, 255, 0.16);
  --about-muted-light: rgba(255, 255, 255, 0.75);
  --about-muted-dark: rgba(255, 255, 255, 0.65);
  background: var(--color-white);
}

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

/* ===== 首屏叙事 ===== */
.page-about__hero {
  position: relative;
  overflow: hidden;
  padding: 36px 0 64px;
  background: var(--color-white);
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -140px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: var(--color-gray-light);
}

.page-about__hero::after {
  content: "";
  position: absolute;
  bottom: -70px;
  left: -60px;
  width: 180px;
  height: 180px;
  border-radius: 44px;
  background: var(--color-blue);
  opacity: 0.08;
  transform: rotate(18deg);
}

.page-about__hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
  margin-top: 44px;
}

.page-about__hero-copy {
  max-width: 640px;
}

.page-about__hero-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  margin: 0 0 18px;
  text-transform: uppercase;
}

.page-about__hero-title {
  margin: 0 0 22px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 6vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.page-about__hero-title span {
  display: block;
  color: var(--color-blue);
}

.page-about__hero-lede {
  margin: 0 0 28px;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text);
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about__hero-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
}

/* ===== 首屏数据面板 ===== */
.page-about__hero-panel {
  max-width: 520px;
  border-radius: var(--radius-lg);
  border-top: 4px solid var(--color-orange);
  background: var(--color-ink);
  color: var(--color-white);
  box-shadow: var(--shadow-2);
  padding: 24px;
}

.page-about__panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--about-panel-line);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 14px;
}

.page-about__panel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-green);
  flex-shrink: 0;
}

.page-about__panel-title {
  flex: 1;
}

.page-about__panel-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about__panel-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.page-about__panel-row dt {
  font-size: 13px;
  color: var(--about-muted-light);
}

.page-about__panel-row dd {
  margin: 0;
  text-align: right;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 15px;
  color: var(--color-white);
}

.page-about__panel-row:nth-child(3) dd {
  color: var(--color-orange);
}

.page-about__panel-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.page-about__panel-foot span {
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(255, 255, 255, 0.85);
}

/* ===== 平台定位 ===== */
.page-about__mission {
  background: var(--color-gray-light);
  padding: 68px 0 72px;
}

.page-about__mission-grid {
  display: grid;
  gap: 28px;
}

.page-about__mission-side .section-title {
  margin: 12px 0 0;
}

.page-about__mission-body {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text);
}

.page-about__mission-body p {
  margin: 0 0 18px;
}

.page-about__mission-body blockquote {
  margin: 28px 0;
  padding: 18px 24px;
  border-left: 4px solid var(--color-orange);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--color-white);
}

.page-about__mission-body blockquote p {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 18px;
  color: var(--color-blue);
}

.page-about__mission-steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 26px 0 28px;
}

.page-about__mission-step {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: var(--color-white);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 14px;
  color: var(--color-ink);
  box-shadow: var(--shadow-1);
}

.page-about__mission-step span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-orange);
}

.page-about__mission-result {
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-white);
}

/* ===== 数据覆盖规模 ===== */
.page-about__coverage {
  background: var(--color-white);
  padding: 72px 0 80px;
}

.page-about__coverage-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 36px;
}

.page-about__coverage-head .section-title {
  margin: 12px 0 0;
}

.page-about__coverage-note {
  margin: 0;
  padding-top: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
}

.page-about__coverage-grid {
  display: grid;
  gap: 24px;
  align-items: start;
}

.page-about__coverage-main {
  padding: 26px;
  border-radius: var(--radius-lg);
  background: var(--color-white);
  box-shadow: var(--shadow-1);
  border: 1px solid var(--color-gray-light);
}

.page-about__coverage-number {
  display: block;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(64px, 10vw, 104px);
  line-height: 1;
  color: var(--color-orange);
}

.page-about__coverage-label {
  margin: 10px 0 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 16px;
  color: var(--color-ink);
}

.page-about__coverage-copy {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about__coverage-figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-blue);
}

.page-about__coverage-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__coverage-figure figcaption {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.85);
}

.page-about__coverage-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about__coverage-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  border-radius: var(--radius-md);
  background: var(--color-white);
  box-shadow: var(--shadow-1);
}

.page-about__coverage-index {
  flex-shrink: 0;
  padding: 4px 7px;
  border-radius: 6px;
  background: var(--color-gray-light);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-blue);
}

.page-about__coverage-list strong {
  display: block;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 15px;
  color: var(--color-ink);
}

.page-about__coverage-list li div span {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-muted);
}

/* ===== 版本演进路线 ===== */
.page-about__evolution {
  background: var(--color-ink);
  color: var(--color-white);
  padding: 72px 0 80px;
}

.page-about__evolution-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 32px;
}

.page-about__evolution-head .section-title {
  margin: 12px 0 0;
  color: var(--color-white);
}

.page-about__evolution-head > p:last-child {
  max-width: 300px;
  margin: 0;
  padding-top: 28px;
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-muted-dark);
}

.page-about__evolution-figure {
  margin: 0 0 28px;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.page-about__evolution-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__timeline-swipe {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
}

.page-about__timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(264px, 84%);
  gap: 16px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scroll-snap-type: inline mandatory;
  padding-bottom: 10px;
  scrollbar-width: thin;
}

.page-about__timeline-item {
  position: relative;
  scroll-snap-align: start;
  padding: 24px 22px 20px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about__timeline-item:hover,
.page-about__timeline-item:focus-within {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.12);
}

.page-about__timeline-marker {
  width: 10px;
  height: 10px;
  margin-bottom: 18px;
  border-radius: 50%;
  background: var(--color-orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 0, 0.25);
}

.page-about__timeline-year {
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-orange);
}

.page-about__timeline-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 18px;
  color: var(--color-white);
}

.page-about__timeline-item p {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.75);
}

.page-about__timeline-item .tag--blue,
.page-about__timeline-item .tag--orange {
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about__timeline-item:hover .tag--blue,
.page-about__timeline-item:hover .tag--orange,
.page-about__timeline-item:focus-within .tag--blue,
.page-about__timeline-item:focus-within .tag--orange {
  transform: translateY(-2px);
}

/* ===== 内容与数据中台 ===== */
.page-about__platform {
  background: var(--color-blue);
  color: var(--color-white);
  padding: 76px 0;
}

.page-about__platform-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about__platform .section-kicker {
  color: rgba(255, 255, 255, 0.7);
}

.page-about__platform .section-title {
  margin-top: 12px;
  color: var(--color-white);
}

.page-about__platform-lede {
  margin: 16px 0 24px;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.88);
}

.page-about__platform-list {
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about__platform-list li {
  position: relative;
  padding: 12px 14px 12px 22px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.1);
  font-size: 14px;
  line-height: 1.65;
}

.page-about__platform-list li::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 18px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-orange);
}

.page-about__platform-note {
  margin: 0;
  padding-left: 12px;
  border-left: 3px solid var(--color-orange);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.75);
}

.page-about__platform-figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.page-about__platform-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 合规与认证 ===== */
.page-about__compliance {
  background: var(--color-gray-light);
  padding: 72px 0 76px;
}

.page-about__compliance-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  margin-bottom: 32px;
}

.page-about__compliance-head .section-title {
  margin: 12px 0 0;
}

.page-about__compliance-head > p:last-child {
  max-width: 320px;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about__cert-grid {
  display: grid;
  gap: 16px;
}

.page-about__cert-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  border-top: 4px solid var(--color-blue);
  background: var(--color-white);
  box-shadow: var(--shadow-1);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about__cert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.page-about__cert-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  border-radius: 14px;
  background: var(--color-blue);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about__cert-card:nth-child(2) .page-about__cert-icon {
  background: var(--color-orange);
}

.page-about__cert-card:nth-child(3) .page-about__cert-icon {
  background: var(--color-ink);
}

.page-about__cert-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 17px;
  color: var(--color-ink);
}

.page-about__cert-card p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about__compliance-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: 28px;
  font-size: 13px;
  color: var(--color-muted);
}

.page-about__compliance-meta a {
  color: var(--color-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(10, 61, 98, 0.3);
}

/* ===== 合作生态 ===== */
.page-about__ecosystem {
  background: var(--color-white);
  padding: 72px 0 80px;
}

.page-about__ecosystem-head {
  display: grid;
  gap: 12px;
  margin-bottom: 36px;
}

.page-about__ecosystem-head .section-title {
  margin: 12px 0 0;
}

.page-about__ecosystem-head > p:last-child {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about__badge-grid {
  display: grid;
  gap: 16px;
}

.page-about__badge {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-line);
  background: var(--color-gray-light);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about__badge:hover {
  border-color: var(--color-blue);
  box-shadow: var(--shadow-1);
}

.page-about__badge-shape {
  position: relative;
  width: 56px;
  height: 56px;
  margin-bottom: 18px;
}

.page-about__badge-shape--datastar span {
  position: absolute;
  left: 10px;
  top: 10px;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--color-blue);
  transform: rotate(12deg);
}

.page-about__badge-shape--datastar::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 2px;
  width: 24px;
  height: 24px;
  border-radius: 8px;
  background: var(--color-orange);
}

.page-about__badge-shape--grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.page-about__badge-shape--grid span {
  border-radius: 6px;
  background: var(--color-blue);
}

.page-about__badge-shape--grid span:nth-child(2),
.page-about__badge-shape--grid span:nth-child(3) {
  background: var(--color-orange);
}

.page-about__badge-shape--pulse {
  border: 3px solid var(--color-blue);
  border-radius: 50%;
}

.page-about__badge-shape--pulse::before {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 50%;
  background: var(--color-orange);
  opacity: 0.3;
}

.page-about__badge-shape--pulse::after {
  content: "";
  position: absolute;
  inset: 16px;
  border-radius: 50%;
  background: var(--color-orange);
}

.page-about__badge-shape--pulse span {
  display: none;
}

.page-about__badge h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 17px;
  color: var(--color-ink);
}

.page-about__badge p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about__badge-details {
  margin-top: 12px;
  font-size: 13px;
  color: var(--color-muted);
}

.page-about__badge-details summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--color-blue);
}

.page-about__badge-details summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 14px;
}

.page-about__badge-details[open] summary::before {
  content: "–";
}

.page-about__badge-details p {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--color-gray-line);
}

/* ===== 收尾 ===== */
.page-about__closing {
  background: var(--color-ink);
  color: var(--color-white);
  padding: 68px 24px;
  text-align: center;
}

.page-about__closing .section-kicker {
  color: rgba(255, 255, 255, 0.6);
}

.page-about__closing-title {
  margin-top: 12px;
  color: var(--color-white);
}

.page-about__closing-lede {
  margin: 16px auto 28px;
  max-width: 560px;
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.75);
}

.page-about__closing-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about__closing-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 640px) {
  .page-about__hero {
    padding: 48px 0 76px;
  }

  .page-about__mission-steps {
    flex-wrap: nowrap;
  }
}

@media (min-width: 800px) {
  .page-about__compliance-head {
    align-items: flex-end;
  }

  .page-about__cert-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__ecosystem-head {
    grid-template-columns: 1fr 1fr;
    align-items: end;
  }

  .page-about__badge-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about__timeline {
    grid-auto-flow: initial;
    grid-auto-columns: 1fr;
    grid-template-columns: repeat(4, 1fr);
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-about__timeline-swipe {
    display: none;
  }
}

@media (min-width: 900px) {
  .page-about__hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
    align-items: center;
  }

  .page-about__mission-grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 72px;
  }

  .page-about__coverage-grid {
    grid-template-columns: 0.9fr 1.15fr 1fr;
    gap: 24px;
  }

  .page-about__platform-grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 64px;
  }
}