.page-about {
  --about-gap: 40px;
  --about-gap-lg: 64px;
  --about-title-size: 32px;
  --about-title-size-lg: 46px;
  --about-paper: rgba(139, 124, 255, 0.28);
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-deep);
}

/* ===== 首屏：错位研究板 ===== */
.page-about .about-hero {
  position: relative;
  padding: 44px 0 40px;
  border-bottom: 1px solid var(--outline);
  background:
    linear-gradient(rgba(0, 168, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 168, 255, 0.05) 1px, transparent 1px),
    radial-gradient(circle at 78% 12%, rgba(0, 168, 255, 0.16), transparent 44%);
  background-size: 28px 28px, 28px 28px, auto;
}

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

.page-about .about-hero-split {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

.page-about .about-hero-aside {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: 26px 22px 30px;
  border: 1px solid var(--outline);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--panel-alt) 0%, var(--surface) 72%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-hero-aside::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 4px;
  background: linear-gradient(90deg, var(--electric-blue), var(--vivid-orange));
  border-radius: 0 2px 2px 0;
}

.page-about .about-hero-edition {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--code-text);
}

.page-about .about-hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.page-about .about-hero-main {
  position: relative;
}

.page-about .about-hero-kicker {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.page-about .about-hero-kicker::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--vivid-orange);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-title);
  font-size: 40px;
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.page-about .about-hero h1 span {
  display: block;
  font-size: 0.72em;
  color: var(--electric-blue);
}

.page-about .about-hero-lead {
  max-width: 680px;
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .about-hero-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  max-width: 680px;
  padding-top: 4px;
}

.page-about .about-hero-toc a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  text-decoration: none;
  border: 1px solid var(--outline);
  border-radius: 999px;
  padding: 6px 12px;
  transition: color 220ms var(--ease), border-color 220ms var(--ease), background-color 220ms var(--ease);
}

.page-about .about-hero-toc a:hover {
  color: var(--electric-blue);
  border-color: var(--electric-blue);
  background-color: var(--electric-blue-soft);
}

/* ===== 通用区块 ===== */
.page-about .about-section {
  position: relative;
  padding: var(--about-gap) 0;
}

.page-about .section-board {
  position: relative;
  border-color: var(--outline);
  background-color: var(--surface);
  padding: 28px 20px;
}

.page-about .section-board .section-index {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--electric-blue);
  border: 1px solid var(--outline);
  background-color: var(--panel-alt);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

.page-about .section-board h2 {
  margin: 0 0 16px;
  font-size: var(--about-title-size);
  line-height: 1.18;
  font-weight: 800;
  color: var(--text-primary);
}

.page-about .section-board p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .section-board a {
  color: var(--electric-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 168, 255, 0.4);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .section-board a:hover {
  color: var(--vivid-orange);
  border-color: var(--vivid-orange);
}

.page-about .image-figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--outline);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--panel-alt);
}

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

.page-about .about-origin-figure img {
  aspect-ratio: 480 / 360;
}

.page-about .about-security-figure img {
  aspect-ratio: 420 / 300;
}

.page-about .about-commitment-figure img {
  aspect-ratio: 400 / 280;
}

/* ===== 01 从一道比分开始 ===== */
.page-about .about-origin-board {
  box-shadow: -12px 12px 0 rgba(18, 22, 31, 0.9), -12px 12px 0 1px var(--outline);
}

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

.page-about .about-origin-copy .about-origin-lead {
  font-size: 18px;
  font-weight: 700;
  color: var(--code-text);
}

.page-about .about-origin-points {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-origin-points li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-primary);
  border-bottom: 1px dashed var(--outline);
  padding-bottom: 10px;
}

.page-about .about-origin-points li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

/* ===== 02 数据与体验并进 ===== */
.page-about .about-evolution-board {
  box-shadow: 14px 10px 0 rgba(139, 124, 255, 0.14), 14px 10px 0 1px rgba(139, 124, 255, 0.22);
}

.page-about .about-evolution-head {
  max-width: 760px;
  margin-bottom: 28px;
}

.page-about .about-flow-wrap {
  overflow-x: auto;
  padding: 6px 0 14px;
  margin-bottom: 24px;
}

.page-about .about-flow-svg {
  display: block;
  width: 760px;
  min-width: 760px;
  height: auto;
}

.page-about .about-flow-path {
  fill: none;
  stroke: var(--electric-blue);
  stroke-width: 2;
  stroke-dasharray: 6 4;
}

.page-about .about-flow-path--orange {
  stroke: var(--vivid-orange);
}

.page-about .about-flow-node {
  transition: transform 240ms var(--ease), opacity 240ms var(--ease);
}

.page-about .about-flow-node:hover {
  transform: translateY(-3px);
}

.page-about .about-flow-node:hover circle {
  fill: rgba(255, 106, 0, 0.22);
  stroke: var(--vivid-orange);
}

.page-about .about-timeline {
  display: grid;
  gap: 18px;
  margin-top: 8px;
}

.page-about .about-stage {
  border: 1px solid var(--outline);
  border-radius: var(--radius-md);
  background-color: var(--panel-alt);
  transition: border-color 240ms var(--ease), background-color 240ms var(--ease);
}

.page-about .about-stage[open] {
  border-color: var(--electric-blue);
  background-color: rgba(0, 168, 255, 0.05);
}

.page-about .about-stage summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 16px 18px;
  list-style: none;
  cursor: pointer;
}

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

.page-about .about-stage summary::after {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--text-secondary);
  border: 1px solid var(--outline);
  border-radius: 50%;
  transition: color 240ms var(--ease), border-color 240ms var(--ease), transform 240ms var(--ease);
}

.page-about .about-stage[open] > summary::after {
  content: "–";
  color: var(--electric-blue);
  border-color: var(--electric-blue);
}

.page-about .about-stage summary:focus-visible {
  outline: 2px solid var(--electric-blue);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.page-about .about-stage-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--violet);
  border: 1px solid rgba(139, 124, 255, 0.4);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  white-space: nowrap;
}

.page-about .about-stage-name {
  font-family: var(--font-title);
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .about-stage-body {
  padding: 4px 18px 20px;
  margin-top: 2px;
  border-top: 1px dashed var(--outline);
}

/* ===== 03 2025版的安全决策 ===== */
.page-about .about-security-board {
  box-shadow: 14px 14px 0 rgba(0, 229, 176, 0.1), 14px 14px 0 1px rgba(0, 229, 176, 0.16);
}

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

.page-about .about-security-copy .about-security-lead {
  font-size: 18px;
  font-weight: 700;
  color: var(--electric-green);
}

.page-about .about-security-note {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-top: 18px;
  padding: 14px 16px;
  background: rgba(0, 229, 176, 0.07);
  border-left: 3px solid var(--electric-green);
  border-radius: var(--radius-sm);
}

.page-about .about-security-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ===== 04 服务承诺 ===== */
.page-about .about-commitment-board {
  box-shadow: 16px 14px 0 rgba(255, 106, 0, 0.12), 16px 14px 0 1px rgba(255, 106, 0, 0.22);
}

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

.page-about .about-contact-list {
  margin: 18px 0 0;
  border: 1px solid var(--outline);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-contact-list > div {
  display: grid;
  grid-template-columns: 92px 1fr;
  border-bottom: 1px solid var(--outline);
}

.page-about .about-contact-list > div:last-child {
  border-bottom: 0;
}

.page-about .about-contact-list dt {
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  background-color: var(--panel-alt);
  border-right: 1px solid var(--outline);
}

.page-about .about-contact-list dd {
  margin: 0;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  word-break: break-all;
  color: var(--text-primary);
}

.page-about .about-contact-list a {
  color: var(--electric-blue);
  border-bottom: 0;
}

.page-about .about-contact-list a:hover {
  color: var(--vivid-orange);
  text-decoration: underline;
  border-bottom: 0;
}

.page-about .about-commitment-copy .about-commitment-note {
  margin-top: 14px;
  font-size: 14px;
  color: var(--text-secondary);
}

.page-about .about-icp-line {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  border-top: 1px dashed var(--outline);
  padding-top: 14px;
}

/* ===== 动效渐进增强 ===== */
.js-enabled .page-about [data-reveal] {
  transition: opacity 560ms var(--ease), transform 560ms var(--ease);
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js-enabled .page-about [data-reveal] {
    transition: none;
  }
}

/* ===== 桌面端布局 ===== */
@media (min-width: 900px) {
  .page-about {
    --about-gap: var(--about-gap-lg);
    --about-title-size: var(--about-title-size-lg);
  }

  .page-about .about-hero {
    padding: 56px 0 52px;
    background-size: 32px 32px, 32px 32px, auto;
  }

  .page-about .about-hero-split {
    grid-template-columns: 1fr 2fr;
    gap: 56px;
    margin-top: 18px;
  }

  .page-about .about-hero-aside {
    transform: translateY(22px);
    padding: 30px 26px 36px;
  }

  .page-about .about-hero-main {
    transform: translateY(-12px);
  }

  .page-about .about-hero h1 {
    font-size: 58px;
  }

  .page-about .about-hero-lead {
    font-size: 18px;
  }

  .page-about .section-board {
    padding: 42px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-evolution-head {
    margin-right: auto;
    margin-left: auto;
    text-align: center;
  }

  .page-about .about-flow-svg {
    width: 100%;
    min-width: 0;
  }

  .page-about .about-timeline {
    max-width: 860px;
    margin-right: auto;
    margin-left: auto;
  }

  .page-about .about-stage:nth-child(odd) {
    margin-right: 7%;
  }

  .page-about .about-stage:nth-child(even) {
    margin-left: 7%;
  }

  .page-about .about-security-grid {
    grid-template-columns: 1fr 0.85fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-commitment-grid {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 48px;
    align-items: center;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero h1 {
    font-size: 64px;
  }

  .page-about .about-hero-split {
    gap: 72px;
  }

  .page-about .section-board p {
    font-size: 16px;
  }
}