.page-about {
  --about-heading: 'Arial Black', 'Noto Sans SC', sans-serif;
  --about-mono: 'Courier New', monospace;
  --about-corner: 24px;
  background: var(--bg-deep);
  color: var(--base-light);
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about .container {
  width: min(1180px, 92%);
  margin: 0 auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 56px 0 64px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, rgba(10, 25, 47, 0.94) 25%, rgba(10, 25, 47, 0.82) 68%, rgba(27, 42, 65, 0.88) 100%),
    repeating-linear-gradient(90deg, rgba(0, 255, 135, 0.04) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(0deg, rgba(0, 255, 135, 0.04) 0 1px, transparent 1px 80px);
  pointer-events: none;
}

.page-about .about-hero-map {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.38;
  pointer-events: none;
}

.page-about .about-hero-lines path {
  fill: none;
  stroke: url(#about-flow-grad);
  stroke-width: 1.6;
  stroke-dasharray: 6 10;
  animation: about-dash-flow 18s linear infinite;
}

.page-about .about-hero-dots circle {
  fill: var(--accent-green);
  opacity: 0.75;
  transform-box: fill-box;
  transform-origin: center;
  animation: about-dot-pulse 2.8s ease-in-out infinite;
}

.page-about .about-hero-dots circle:nth-child(3n) {
  fill: var(--accent-orange);
  animation-delay: 0.8s;
}

.page-about .about-hero-dots circle:nth-child(4n) {
  animation-delay: 1.4s;
}

.page-about .about-hero-dots circle:nth-child(5n) {
  animation-delay: 2s;
}

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

.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--mineral-grey);
  margin-bottom: 48px;
}

.page-about .about-crumb a {
  color: var(--mineral-grey);
  text-decoration: none;
  transition: color 0.3s var(--ease-out-expo);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--accent-green);
  outline: none;
}

.page-about .about-crumb-sep {
  opacity: 0.55;
}

.page-about .about-hero-main {
  display: grid;
  gap: 48px;
}

.page-about .about-hero-copy {
  max-width: 720px;
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--accent-green);
  margin-bottom: 20px;
}

.page-about .about-eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--accent-green);
  display: inline-block;
  transform: skewX(-35deg);
}

.page-about .about-h1 {
  margin: 0 0 24px;
  font-family: var(--about-heading);
  font-size: 34px;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--base-light);
}

.page-about .about-lead {
  margin: 0 0 32px;
  font-size: 16px;
  color: rgba(242, 239, 233, 0.84);
  max-width: 64ch;
}

.page-about .about-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.page-about .about-hero-cta .btn {
  min-height: 48px;
}

.page-about .about-hero-kpis {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  list-style: none;
}

.page-about .about-kpi-item {
  background: rgba(27, 42, 65, 0.82);
  border: 1px solid rgba(0, 255, 135, 0.22);
  border-left: 3px solid var(--accent-green);
  padding: 18px 16px;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  backdrop-filter: blur(4px);
}

.page-about .about-kpi-item dd {
  font-family: var(--about-mono);
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--accent-green);
}

.page-about .about-kpi-num {
  font-family: var(--about-mono);
  font-size: 24px;
  margin-right: 2px;
}

.page-about .about-kpi-item dt {
  font-size: 13px;
  color: rgba(242, 239, 233, 0.64);
}

/* ---------- 通用区块头 ---------- */
.page-about .about-sec-head {
  max-width: 760px;
  margin-bottom: 48px;
}

.page-about .about-kicker {
  margin: 0 0 10px;
  font-family: var(--about-mono);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent-orange);
}

.page-about .about-sec-title {
  margin: 0 0 14px;
  font-family: var(--about-heading);
  font-size: 30px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--base-light);
}

.page-about .about-sec-desc {
  margin: 0;
  font-size: 16px;
  color: rgba(242, 239, 233, 0.78);
}

/* ---------- 品牌故事 · 版本时间轴 ---------- */
.page-about .about-story,
.page-about .about-system,
.page-about .about-update,
.page-about .about-team,
.page-about .about-tech,
.page-about .about-compliance,
.page-about .about-commitment {
  position: relative;
  padding: 64px 0;
}

.page-about .about-story {
  background:
    linear-gradient(180deg, rgba(10, 25, 47, 0) 0%, rgba(27, 42, 65, 0.34) 100%);
}

.page-about .about-timeline {
  position: relative;
  margin-left: 6px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 28px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--mineral-clay), var(--accent-green));
  opacity: 0.5;
}

.page-about .about-version {
  position: relative;
  margin-bottom: 20px;
  background: var(--bg-card);
  border: 1px solid rgba(242, 239, 233, 0.08);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  transition: background 0.4s var(--ease-out-expo), border-color 0.4s var(--ease-out-expo);
}

.page-about .about-version[open] {
  background: rgba(27, 42, 65, 0.92);
  border-color: rgba(193, 154, 107, 0.46);
}

.page-about .about-version summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding: 20px 48px 20px 24px;
  min-height: 72px;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  color: var(--base-light);
  transition: color 0.3s var(--ease-out-expo);
}

.page-about .about-version summary::-webkit-details-marker {
  display: none;
}

.page-about .about-version summary:hover,
.page-about .about-version summary:focus-visible {
  color: var(--accent-green);
  outline: none;
}

.page-about .about-version summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--about-mono);
  font-size: 24px;
  color: var(--mineral-clay);
  transition: transform 0.4s var(--ease-out-expo);
}

.page-about .about-version[open] summary::after {
  content: "–";
  transform: translateY(-50%) rotate(180deg);
}

.page-about .about-ver-node {
  position: relative;
  z-index: 1;
  flex: 0 0 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--about-mono);
  font-size: 18px;
  font-weight: 700;
  background: rgba(193, 154, 107, 0.16);
  border: 1px solid var(--mineral-clay);
  color: var(--mineral-clay);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.page-about .about-ver-tag {
  font-family: var(--about-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--accent-orange);
}

.page-about .about-ver-label {
  font-size: 14px;
  color: rgba(242, 239, 233, 0.7);
  flex: 1 1 180px;
}

.page-about .about-ver-body {
  padding: 4px 24px 24px 24px;
  border-top: 1px solid rgba(242, 239, 233, 0.08);
  margin-left: 24px;
}

.page-about .about-ver-body p {
  margin: 20px 0 16px;
  font-size: 15px;
  color: rgba(242, 239, 233, 0.8);
  max-width: 60ch;
}

.page-about .about-ver-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-ver-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: rgba(242, 239, 233, 0.7);
}

.page-about .about-ver-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  transform: rotate(45deg);
}

/* ---------- 数据体系 ---------- */
.page-about .about-system {
  background:
    linear-gradient(135deg, rgba(0, 255, 135, 0.05) 0%, transparent 45%),
    var(--bg-deep);
}

.page-about .about-system-grid {
  display: grid;
  gap: 48px;
  align-items: center;
}

.page-about .about-figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
  background: var(--bg-card);
  border: 1px solid rgba(242, 239, 233, 0.08);
}

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

.page-about .about-figure figcaption {
  padding: 14px 20px;
  font-size: 13px;
  color: rgba(242, 239, 233, 0.62);
  border-top: 1px solid rgba(242, 239, 233, 0.06);
}

.page-about .about-system-layers {
  display: grid;
  gap: 14px;
}

.page-about .about-layer {
  position: relative;
  display: flex;
  align-items: stretch;
  background: rgba(27, 42, 65, 0.72);
  border: 1px solid rgba(242, 239, 233, 0.08);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  transition: background 0.4s var(--ease-out-expo), transform 0.4s var(--ease-out-expo), border-color 0.4s var(--ease-out-expo);
}

.page-about .about-layer:hover,
.page-about .about-layer:focus-within {
  background: rgba(27, 42, 65, 0.96);
  border-color: rgba(0, 255, 135, 0.36);
  transform: translateX(6px);
}

.page-about .about-layer-idx {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  padding: 0 18px;
  font-family: var(--about-mono);
  font-size: 22px;
  font-weight: 700;
  color: rgba(0, 255, 135, 0.35);
  border-right: 1px solid rgba(242, 239, 233, 0.08);
}

.page-about .about-layer-content {
  padding: 20px 20px 20px 18px;
  flex: 1;
}

.page-about .about-layer-content h3 {
  margin: 0 0 6px;
  font-family: var(--about-heading);
  font-size: 18px;
  color: var(--base-light);
}

.page-about .about-layer-content p {
  margin: 0 0 10px;
  font-size: 15px;
  color: rgba(242, 239, 233, 0.78);
}

.page-about .about-num {
  font-family: var(--about-mono);
  font-weight: 700;
  color: var(--accent-green);
}

.page-about .about-layer-meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--about-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(242, 239, 233, 0.52);
  background: rgba(242, 239, 233, 0.05);
  padding: 4px 10px;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

/* ---------- 更新机制 ---------- */
.page-about .about-update {
  background:
    linear-gradient(to right, rgba(193, 154, 107, 0.08), transparent 42%),
    var(--bg-deep);
}

.page-about .about-update-track {
  display: grid;
  gap: 24px;
}

.page-about .about-update-item {
  position: relative;
  padding: 24px 20px 24px 48px;
  background: var(--bg-card);
  border: 1px solid rgba(242, 239, 233, 0.07);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: border-color 0.4s var(--ease-out-expo);
}

.page-about .about-update-item:hover {
  border-color: rgba(0, 255, 135, 0.3);
}

.page-about .about-update-node {
  position: absolute;
  left: 20px;
  top: 34px;
  width: 12px;
  height: 12px;
  background: var(--mineral-clay);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(193, 154, 107, 0.18);
  transition: background 0.3s var(--ease-out-expo);
}

.page-about .about-update-item:hover .about-update-node {
  background: var(--accent-green);
  box-shadow: 0 0 0 6px rgba(0, 255, 135, 0.14);
}

.page-about .about-update-time {
  display: inline-block;
  font-family: var(--about-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent-orange);
  margin-bottom: 8px;
}

.page-about .about-update-item h3 {
  margin: 0 0 10px;
  font-family: var(--about-heading);
  font-size: 19px;
  color: var(--base-light);
}

.page-about .about-update-item p {
  margin: 0;
  font-size: 15px;
  color: rgba(242, 239, 233, 0.74);
  max-width: 52ch;
}

/* ---------- 团队与组织 ---------- */
.page-about .about-team {
  background:
    linear-gradient(115deg, rgba(255, 107, 0, 0.04) 0%, transparent 45%),
    rgba(27, 42, 65, 0.24);
}

.page-about .about-team-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .about-team-card {
  position: relative;
  padding: 28px 24px;
  background: var(--bg-card);
  border: 1px solid rgba(242, 239, 233, 0.08);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  transition: transform 0.45s var(--ease-out-expo), border-color 0.45s var(--ease-out-expo);
}

.page-about .about-team-card:hover {
  transform: translateY(-6px);
}

.page-about .about-team-card--data {
  border-left: 4px solid var(--accent-green);
}

.page-about .about-team-card--tech {
  border-left: 4px solid var(--accent-orange);
}

.page-about .about-team-card--edit {
  border-left: 4px solid var(--mineral-clay);
}

.page-about .about-team-icon {
  display: inline-flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--base-light);
  background: rgba(242, 239, 233, 0.06);
  margin-bottom: 18px;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.page-about .about-team-card--data .about-team-icon {
  color: var(--accent-green);
}

.page-about .about-team-card--tech .about-team-icon {
  color: var(--accent-orange);
}

.page-about .about-team-card--edit .about-team-icon {
  color: var(--mineral-clay);
}

.page-about .about-team-card h3 {
  margin: 0 0 12px;
  font-family: var(--about-heading);
  font-size: 20px;
  color: var(--base-light);
}

.page-about .about-team-card p {
  margin: 0 0 18px;
  font-size: 15px;
  color: rgba(242, 239, 233, 0.74);
}

.page-about .about-team-meta {
  display: inline-block;
  font-family: var(--about-mono);
  font-size: 12px;
  color: rgba(242, 239, 233, 0.5);
  padding: 6px 12px;
  border: 1px solid rgba(242, 239, 233, 0.12);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

/* ---------- 技术底座 ---------- */
.page-about .about-tech {
  background: var(--bg-deep);
}

.page-about .about-tech-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

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

.page-about .about-tech-list li {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 18px 16px;
  background: rgba(27, 42, 65, 0.6);
  border: 1px solid rgba(242, 239, 233, 0.07);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: border-color 0.3s var(--ease-out-expo);
}

.page-about .about-tech-list li:hover {
  border-color: rgba(0, 255, 135, 0.3);
}

.page-about .about-tech-num {
  flex: 0 0 auto;
  font-family: var(--about-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-green);
  background: rgba(0, 255, 135, 0.08);
  padding: 6px 10px;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

.page-about .about-tech-list li:nth-child(2) .about-tech-num {
  color: var(--accent-orange);
  background: rgba(255, 107, 0, 0.08);
}

.page-about .about-tech-list p {
  margin: 0;
  font-size: 15px;
  color: rgba(242, 239, 233, 0.76);
}

/* ---------- 品牌认证与合规 ---------- */
.page-about .about-compliance {
  background:
    linear-gradient(135deg, rgba(193, 154, 107, 0.1) 0%, transparent 40%),
    rgba(27, 42, 65, 0.3);
}

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

.page-about .about-badge {
  padding: 28px 24px;
  background: var(--bg-card);
  border: 1px solid rgba(242, 239, 233, 0.08);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  position: relative;
}

.page-about .about-badge::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--mineral-clay), var(--accent-green));
}

.page-about .about-badge-code {
  display: block;
  margin-bottom: 10px;
  font-family: var(--about-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent-green);
}

.page-about .about-badge--ssl .about-badge-code {
  color: var(--accent-orange);
}

.page-about .about-badge--privacy .about-badge-code {
  color: var(--mineral-clay);
}

.page-about .about-badge p {
  margin: 0;
  font-size: 15px;
  color: rgba(242, 239, 233, 0.76);
}

.page-about .about-badge-links {
  margin-top: 14px;
  font-size: 14px;
}

.page-about .about-badge-links a {
  color: var(--accent-green);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 255, 135, 0.4);
  transition: border-color 0.3s var(--ease-out-expo);
}

.page-about .about-badge-links a:hover,
.page-about .about-badge-links a:focus-visible {
  border-bottom-color: var(--accent-green);
  outline: none;
}

/* ---------- 品牌承诺 ---------- */
.page-about .about-commitment {
  background:
    linear-gradient(160deg, rgba(0, 255, 135, 0.08) 0%, transparent 50%),
    var(--bg-deep);
  overflow: hidden;
}

.page-about .about-commitment::after {
  content: "";
  display: block;
  height: 3px;
  width: 100%;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-orange), var(--mineral-clay));
  transform: skewX(-45deg) scaleX(1.2);
}

.page-about .about-commit-inner {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 0 56px;
}

.page-about .about-commit-title {
  margin: 0 0 20px;
  font-family: var(--about-heading);
  font-size: 30px;
  line-height: 1.3;
  color: var(--base-light);
}

.page-about .about-commit-desc {
  margin: 0 auto 32px;
  font-size: 16px;
  color: rgba(242, 239, 233, 0.78);
  max-width: 58ch;
}

.page-about .about-commit-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  align-items: center;
}

.page-about .about-commit-actions .btn {
  min-height: 48px;
}

.page-about .about-commit-link {
  color: var(--base-light);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 239, 233, 0.3);
  padding-bottom: 2px;
  transition: color 0.3s var(--ease-out-expo), border-color 0.3s var(--ease-out-expo);
}

.page-about .about-commit-link:hover,
.page-about .about-commit-link:focus-visible {
  color: var(--accent-green);
  border-bottom-color: var(--accent-green);
  outline: none;
}

/* ---------- 动效 ---------- */
@keyframes about-dash-flow {
  to {
    stroke-dashoffset: -320;
  }
}

@keyframes about-dot-pulse {
  0%, 100% {
    opacity: 0.25;
    transform: scale(0.6);
  }
  50% {
    opacity: 0.95;
    transform: scale(1.4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero-lines path,
  .page-about .about-hero-dots circle {
    animation: none;
  }

  .page-about .about-layer,
  .page-about .about-team-card,
  .page-about .about-update-item,
  .page-about .about-badge {
    transition: none;
  }
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 80px 0 96px;
  }

  .page-about .about-hero-main {
    grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
    align-items: center;
    gap: 64px;
  }

  .page-about .about-h1 {
    font-size: 48px;
  }

  .page-about .about-lead {
    font-size: 18px;
    line-height: 1.8;
  }

  .page-about .about-hero-kpis {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-sec-head {
    margin-bottom: 56px;
  }

  .page-about .about-sec-title {
    font-size: 34px;
  }

  .page-about .about-story,
  .page-about .about-system,
  .page-about .about-update,
  .page-about .about-team,
  .page-about .about-tech,
  .page-about .about-compliance,
  .page-about .about-commitment {
    padding: 92px 0;
  }

  .page-about .about-timeline {
    margin-left: 0;
    padding-left: 48px;
  }

  .page-about .about-timeline::before {
    left: 44px;
  }

  .page-about .about-version summary {
    padding-left: 32px;
  }

  .page-about .about-system-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 64px;
  }

  .page-about .about-update-track {
    grid-template-columns: repeat(2, 1fr);
    align-items: stretch;
  }

  .page-about .about-update-item {
    padding: 32px 28px 32px 64px;
  }

  .page-about .about-update-node {
    left: 28px;
    top: 44px;
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-tech-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 64px;
  }

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

  .page-about .about-commit-inner {
    padding: 64px 0 72px;
  }

  .page-about .about-commit-title {
    font-size: 36px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-main {
    gap: 96px;
  }

  .page-about .about-version summary {
    gap: 20px;
  }

  .page-about .about-ver-label {
    font-size: 15px;
  }

  .page-about .about-layer-content {
    padding: 26px 28px;
  }

  .page-about .about-layer-idx {
    padding: 0 26px;
    font-size: 26px;
  }

  .page-about .about-team-card {
    padding: 36px 32px;
  }
}