.page-about {
  --about-line: rgba(138, 155, 171, 0.16);
  --about-blueprint: rgba(0, 255, 136, 0.08);
  position: relative;
  max-width: 1560px;
  margin-inline: auto;
  padding: clamp(24px, 4vw, 56px) clamp(20px, 4vw, 56px) clamp(64px, 8vw, 120px);
  overflow: clip;
  background-color: var(--bg-main);
}

.page-about::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-line) 1px, transparent 1px);
  background-size: 42px 42px;
  pointer-events: none;
  z-index: 0;
}

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

.page-about section {
  max-width: var(--max-width);
  margin-inline: auto;
}

.page-about section + section {
  margin-top: clamp(48px, 8vw, 100px);
  padding-top: clamp(40px, 7vw, 88px);
  border-top: 1px dashed var(--grid-line);
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* 面包屑 */
.crumb-bar {
  max-width: var(--max-width);
  margin: 0 auto clamp(24px, 5vw, 48px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--grid-line);
}

.crumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.crumb-list a {
  color: var(--text-body);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.crumb-list a:hover {
  color: var(--accent);
}

.crumb-sep {
  color: var(--grid-solid);
}

.crumb-current {
  color: var(--text-strong);
}

.crumb-coord {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  white-space: nowrap;
}

@media (max-width: 599px) {
  .crumb-coord {
    display: none;
  }
}

/* 首屏 */
.about-hero {
  padding: clamp(8px, 2vw, 24px) 0 clamp(32px, 5vw, 64px);
}

.about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}

@media (min-width: 900px) {
  .about-hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: clamp(36px, 6vw, 80px);
  }
}

.about-hero-copy {
  max-width: 680px;
}

.about-hero-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 22px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
}

.about-hero-kicker-dot {
  color: var(--alert);
  font-size: 9px;
  animation: about-pulse 2s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.about-hero-title {
  margin: 0 0 24px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 7vw, 72px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--text-strong);
  text-transform: uppercase;
}

.about-hero-title-sep {
  display: none;
}

.about-hero-title-inner {
  display: block;
  color: var(--accent);
  font-weight: 500;
  text-transform: none;
  margin-top: 6px;
}

.about-hero-lead {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--text-body);
  max-width: 560px;
}

.about-hero-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 4vw, 40px);
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--grid-line);
}

.about-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.about-metric-num {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--text-strong);
}

.about-metric-unit {
  font-family: var(--font-data);
  font-size: 16px;
  color: var(--accent);
  margin-left: 4px;
}

.about-metric-label {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.about-hero-figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
}

.about-hero-figure::before,
.about-hero-figure::after {
  content: '';
  position: absolute;
  width: 26px;
  height: 26px;
  border-color: var(--accent);
  border-style: solid;
  z-index: 2;
  pointer-events: none;
}

.about-hero-figure::before {
  top: -8px;
  left: -8px;
  border-width: 2px 0 0 2px;
  border-radius: 8px 0 0 0;
}

.about-hero-figure::after {
  bottom: -8px;
  right: -8px;
  border-width: 0 2px 2px 0;
  border-radius: 0 0 8px 0;
}

.about-hero-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--grid-line);
}

.about-figure-tag,
.about-figure-coord {
  position: absolute;
  z-index: 2;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(10, 27, 42, 0.74);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.about-figure-tag {
  top: 16px;
  left: 16px;
  color: var(--accent);
}

.about-figure-coord {
  bottom: 16px;
  right: 16px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

/* 章节索引条 */
.about-index {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin-top: clamp(28px, 5vw, 56px);
  padding: 14px 18px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-pill);
  background: rgba(24, 42, 61, 0.6);
}

@media (min-width: 600px) {
  .about-index {
    justify-content: flex-end;
  }
}

.about-index a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  color: var(--text-body);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.about-index a:hover {
  color: var(--accent);
  background: var(--accent-dim);
}

.about-index-num {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--accent);
}

.about-index-sep {
  color: var(--grid-solid);
  font-size: 14px;
}

/* 通用章节标题 */
.about-section-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2.4vw, 24px);
  margin-bottom: clamp(28px, 5vw, 48px);
}

.about-section-index {
  font-family: var(--font-data);
  font-size: clamp(18px, 3vw, 28px);
  line-height: 1;
  color: var(--accent);
  padding-top: 4px;
}

.about-section-head-text {
  flex: 1;
}

.about-section-label {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.about-section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--text-strong);
}

.about-section-lead {
  margin: 14px 0 0;
  max-width: 660px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

.about-section-file {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  white-space: nowrap;
}

@media (max-width: 599px) {
  .about-section-file {
    display: none;
  }
}

/* 01 品牌定位 */
.about-position-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 900px) {
  .about-position-layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: clamp(32px, 6vw, 72px);
  }
}

.about-position-main p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
}

.about-position-main p:first-child {
  font-size: clamp(18px, 2.4vw, 22px);
  line-height: 1.6;
  color: var(--cream);
  border-left: 3px solid var(--accent);
  padding-left: 18px;
  margin-bottom: 20px;
}

.about-principle {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
  margin-bottom: 12px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-md);
  background: rgba(24, 42, 61, 0.5);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.about-principle:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.about-principle-num {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--alert);
  padding-top: 4px;
  flex-shrink: 0;
}

.about-principle-name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-strong);
}

.about-principle-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-dim);
}

/* 02 发展史 */
.about-history-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

@media (min-width: 900px) {
  .about-history-layout {
    grid-template-columns: 0.78fr 1.22fr;
  }
}

.about-history-visual {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
}

.about-history-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--grid-line);
  object-fit: cover;
}

.about-history-caption {
  margin-top: 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.about-version {
  display: grid;
  gap: 18px;
}

.about-version-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.about-version-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-pill);
  background: rgba(24, 42, 61, 0.5);
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.about-version-tab:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.about-version-tab[aria-selected="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-main);
  font-weight: 600;
}

.about-version-tab-code {
  font-family: var(--font-data);
  font-weight: 600;
}

.about-version-tab-name {
  font-size: 13px;
  opacity: 0.88;
}

.about-version-panels {
  position: relative;
}

.about-version-panel {
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-lg);
  background: var(--bg-panel);
  box-shadow: var(--shadow-panel);
  padding: clamp(22px, 3.6vw, 36px);
}

.about-version-panel[hidden] {
  display: none;
}

.about-version-panel-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 600;
  color: var(--text-strong);
}

.about-version-panel p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

.about-version-points {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.about-version-points li {
  position: relative;
  padding: 10px 14px;
  background: rgba(0, 255, 136, 0.06);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 14px;
  color: var(--text-body);
}

.about-version-link,
.about-data-note-link,
.about-security-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s var(--ease), gap 0.2s var(--ease);
}

.about-version-link:hover,
.about-data-note-link:hover,
.about-security-link:hover {
  color: var(--text-strong);
  gap: 10px;
}

/* 03 数据能力 */
.about-data-metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

@media (min-width: 600px) {
  .about-data-metrics {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .about-data-metrics {
    grid-template-columns: repeat(4, 1fr);
  }
}

.about-data-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 24px 22px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-lg);
  background: var(--bg-panel);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.about-data-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 32px rgba(0, 255, 136, 0.1);
}

.about-data-card--offset {
  margin-top: 0;
}

@media (min-width: 1000px) {
  .about-data-card--offset {
    margin-top: 28px;
  }
}

.about-data-card-index {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

.about-data-card-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 5vw, 54px);
  line-height: 1;
  color: var(--accent);
}

.about-data-card-unit {
  font-family: var(--font-data);
  font-style: normal;
  font-size: 18px;
  color: var(--text-body);
  margin-left: 4px;
}

.about-data-card-label {
  font-size: 14px;
  line-height: 1.4;
  color: var(--text-body);
}

.about-data-map {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

@media (min-width: 900px) {
  .about-data-map {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.about-data-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.about-data-note {
  padding: clamp(22px, 3.6vw, 36px);
  border: 1px solid rgba(0, 255, 136, 0.3);
  border-radius: var(--radius-lg);
  background: rgba(0, 255, 136, 0.07);
}

.about-data-note-tag {
  display: inline-block;
  margin-bottom: 14px;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: var(--accent-dim);
  color: var(--accent);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.about-data-note-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  color: var(--text-strong);
}

.about-data-note p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

/* 04 团队与资质 */
.about-org-tabs {
  padding-top: 24px;
  border-top: 1px solid var(--grid-line);
}

.about-org-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.about-org-tab {
  padding: 12px 24px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: 15px;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.about-org-tab:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.about-org-tab[aria-selected="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-main);
  font-weight: 600;
}

.about-org-panel {
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-lg);
  background: var(--bg-panel);
  box-shadow: var(--shadow-panel);
  padding: clamp(22px, 4vw, 40px);
}

.about-org-panel[hidden] {
  display: none;
}

.about-org-panel-layout {
  max-width: 920px;
}

.about-org-intro {
  margin: 0 0 28px;
  max-width: 680px;
  font-size: 18px;
  line-height: 1.65;
  color: var(--cream);
}

.about-org-role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 600px) {
  .about-org-role-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.about-role {
  padding: 18px 20px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-md);
  background: rgba(138, 155, 171, 0.06);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.about-role:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.about-role-num {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--accent);
}

.about-role-title {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-strong);
}

.about-role-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-dim);
}

.about-tech-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 600px) {
  .about-tech-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.about-tech-list li {
  padding: 22px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-md);
  background: rgba(138, 155, 171, 0.06);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.about-tech-list li:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.about-tech-index {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--accent);
}

.about-tech-title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  color: var(--text-strong);
}

.about-tech-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-dim);
}

.about-security-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.about-security-list li {
  display: flex;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-md);
  background: rgba(138, 155, 171, 0.06);
  transition: border-color 0.25s var(--ease);
}

.about-security-list li:hover {
  border-color: var(--accent);
}

.about-security-mark {
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--accent);
  padding-top: 2px;
  flex-shrink: 0;
}

.about-security-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  color: var(--text-strong);
}

.about-security-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-dim);
}

/* 底部行动区 */
.about-cta {
  padding: clamp(40px, 6vw, 72px) clamp(20px, 5vw, 64px);
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 82% 18%, rgba(0, 255, 136, 0.16), transparent 40%),
    radial-gradient(circle at 12% 82%, rgba(255, 107, 0, 0.12), transparent 42%),
    var(--bg-panel);
  text-align: center;
}

.about-cta-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 46px);
  font-weight: 600;
  color: var(--text-strong);
}

.about-cta-lead {
  margin: 0 0 30px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-body);
}

.about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.about-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: var(--bg-main);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
}

.about-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}

.about-cta-btn--ghost {
  background: transparent;
  color: var(--text-strong);
  border: 1px solid var(--grid-line);
}

.about-cta-btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: none;
}

/* 滚动显现补强 */
.page-about [data-reveal] {
  will-change: opacity, transform;
}