.page-about {
  --pa-sec-pad: clamp(44px, 7vw, 84px);
}

.page-about .pa-sec {
  padding-block: var(--pa-sec-pad);
}

/* ---------- 首屏 ---------- */
.page-about .pa-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(24px, 5vw, 52px) clamp(32px, 6vw, 68px);
  border-bottom: 1px solid var(--line);
}

.page-about .pa-hero::before {
  content: "";
  position: absolute;
  inset: -18% -12% auto -12%;
  height: 560px;
  background:
    radial-gradient(420px 300px at 12% 22%, rgba(25, 245, 197, 0.18), transparent 70%),
    radial-gradient(470px 330px at 82% 8%, rgba(168, 85, 247, 0.2), transparent 72%),
    radial-gradient(380px 280px at 55% 62%, rgba(56, 189, 248, 0.12), transparent 70%);
  pointer-events: none;
}

.page-about .breadcrumb {
  position: relative;
  margin-bottom: clamp(18px, 3vw, 30px);
  font-size: 13px;
}

.page-about .pa-hero-grid {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .pa-h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .pa-lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .pa-hero-meta {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .pa-meta-item {
  padding-left: 12px;
  border-left: 2px solid var(--line-cyan);
}

.page-about .pa-meta-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.4vw, 24px);
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .pa-meta-label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .pa-hero-visual {
  position: relative;
}

.page-about .pa-orbit {
  display: block;
  width: 100%;
  height: auto;
  max-width: 560px;
  margin-inline: auto;
}

.page-about .pa-ring {
  fill: none;
  stroke: rgba(25, 245, 197, 0.34);
  stroke-width: 1.5;
}

.page-about .pa-ring-2 {
  stroke: rgba(168, 85, 247, 0.42);
  stroke-dasharray: 6 10;
}

.page-about .pa-node-a,
.page-about .pa-node-b {
  animation: paPulse 3.6s ease-in-out infinite;
}

.page-about .pa-node-b {
  animation-delay: 1.4s;
}

@keyframes paPulse {
  0%, 100% { opacity: 0.45; }
  50% { opacity: 1; }
}

/* ---------- 章节导航 ---------- */
.page-about .pa-chapters {
  border-bottom: 1px solid var(--line);
  background: rgba(14, 27, 46, 0.55);
}

.page-about .pa-chapters-row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-block: 12px;
  scrollbar-width: thin;
}

.page-about .pa-chapters-row .toc-link {
  flex: 0 0 auto;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .pa-chapters-row .toc-link:hover,
.page-about .pa-chapters-row .toc-link:focus-visible,
.page-about .pa-chapters-row .toc-link.is-active {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 通用排版 ---------- */
.page-about .pa-h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.005em;
  color: var(--text);
}

.page-about .pa-lede {
  margin: 14px 0 0;
  max-width: 72ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .pa-p {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  opacity: 0.9;
}

.page-about .pa-p-sub {
  color: var(--muted);
  opacity: 1;
  font-size: 15px;
}

.page-about .pa-split {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

/* ---------- 图片框 ---------- */
.page-about .pa-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-cyan);
  background: var(--panel-deep);
  box-shadow: var(--shadow-lg);
}

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

.page-about .pa-figure figcaption {
  padding: 10px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---------- 时间线 ---------- */
.page-about .pa-timeline {
  position: relative;
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: 16px;
}

.page-about .pa-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 13px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet), rgba(56, 189, 248, 0.4));
  opacity: 0.55;
}

.page-about .pa-tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .pa-tl-node {
  grid-column: 1;
  display: flex;
  justify-content: center;
  padding-top: 20px;
}

.page-about .pa-tl-node i {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(25, 245, 197, 0.12), 0 0 14px rgba(25, 245, 197, 0.5);
}

.page-about .pa-tl-body {
  grid-column: 2;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.06), rgba(14, 27, 46, 0.95));
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .pa-tl-body:hover {
  border-color: var(--line-cyan);
  box-shadow: 0 0 0 1px rgba(25, 245, 197, 0.18), 0 14px 30px rgba(2, 7, 15, 0.45);
}

.page-about .pa-tl-stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .pa-tl-title {
  margin: 8px 0 0;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.3;
  color: var(--text);
}

.page-about .pa-tl-text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 统计条 ---------- */
.page-about .pa-stats {
  margin-top: clamp(24px, 4vw, 44px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--line);
}

.page-about .pa-stat {
  padding: 18px 16px;
  background: linear-gradient(180deg, rgba(14, 27, 46, 0.96), rgba(11, 23, 40, 0.98));
}

.page-about .pa-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 30px);
  color: var(--cyan);
  letter-spacing: 0.01em;
}

.page-about .pa-stat:nth-child(2) b {
  color: var(--violet-text);
}

.page-about .pa-stat:nth-child(4) b {
  color: var(--blue);
}

.page-about .pa-stat span {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 团队与流程 ---------- */
.page-about .pa-split-team,
.page-about .pa-split-proof {
  margin-top: clamp(22px, 4vw, 36px);
}

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

.page-about .pa-process li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border-left: 2px solid var(--line-violet);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(255, 255, 255, 0.04);
}

.page-about .pa-proc-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--violet-text);
  padding-top: 3px;
}

.page-about .pa-proc-title {
  margin: 0;
  font-size: 17px;
  line-height: 1.35;
  color: var(--text);
}

.page-about .pa-process .pa-p {
  margin-top: 6px;
  font-size: 14.5px;
  color: var(--muted);
  opacity: 1;
}

.page-about .pa-quote {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(56, 189, 248, 0.1), rgba(14, 27, 46, 0.96));
  align-self: stretch;
}

.page-about .pa-quote-title {
  margin: 0;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.35;
  color: var(--text);
}

.page-about .pa-quote .pa-p {
  font-size: 15px;
  color: var(--muted);
  opacity: 1;
}

/* ---------- 供稿生态 ---------- */
.page-about .pa-eco {
  margin-top: clamp(22px, 4vw, 34px);
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .pa-eco-card {
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--panel);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .pa-eco-card:nth-child(1) {
  border-color: var(--line-cyan);
}

.page-about .pa-eco-card:nth-child(3) {
  border-color: rgba(245, 199, 106, 0.36);
}

.page-about .pa-eco-card:hover {
  transform: translateY(-2px);
}

.page-about .pa-eco-title {
  margin: 12px 0 0;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.35;
  color: var(--text);
}

.page-about .pa-eco-card .pa-p {
  font-size: 14.5px;
  color: var(--muted);
  opacity: 1;
}

.page-about .pa-tags {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 认证 ---------- */
.page-about .pa-cert {
  margin-top: clamp(22px, 4vw, 34px);
  padding: clamp(20px, 4vw, 34px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(245, 199, 106, 0.42);
  background:
    radial-gradient(560px 200px at 0% 0%, rgba(245, 199, 106, 0.13), transparent 70%),
    linear-gradient(160deg, rgba(14, 27, 46, 0.92), rgba(11, 23, 40, 0.98));
  box-shadow: var(--shadow-lg);
}

.page-about .pa-cert-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .pa-cert-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--gold);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .pa-cert-title {
  margin: 0;
  font-size: clamp(18px, 2.3vw, 23px);
  line-height: 1.35;
  color: var(--text);
}

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

.page-about .pa-cert-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .pa-cert-list li::before {
  content: "◆";
  position: absolute;
  left: 0;
  top: 1px;
  font-size: 11px;
  color: var(--cyan);
}

/* ---------- 服务与联系 ---------- */
.page-about .pa-stats-wide {
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .pa-cta {
  margin-top: clamp(24px, 4vw, 40px);
  padding: clamp(20px, 4vw, 34px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-cyan);
  background: linear-gradient(125deg, rgba(25, 245, 197, 0.1), rgba(168, 85, 247, 0.14));
  display: grid;
  gap: 20px;
}

.page-about .pa-cta-title {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.35;
  color: var(--text);
}

.page-about .pa-cta-copy .pa-p {
  font-size: 15px;
  color: var(--text);
  opacity: 0.86;
}

.page-about .pa-contact-line {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--muted);
  word-break: break-word;
}

.page-about .pa-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .pa-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .pa-eco {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .pa-hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
  }

  .page-about .pa-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .pa-split-team {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .pa-split-proof {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: stretch;
  }

  .page-about .pa-timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

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

  .page-about .pa-tl-node {
    grid-column: 2;
    padding-top: 24px;
  }

  .page-about .pa-tl-body {
    grid-column: 3;
  }

  .page-about .pa-tl-item:nth-child(odd) .pa-tl-body {
    grid-column: 1;
    text-align: right;
  }

  .page-about .pa-tl-item:nth-child(odd) .pa-tl-body {
    margin-right: 4px;
  }

  .page-about .pa-tl-item:nth-child(even) .pa-tl-body {
    margin-left: 4px;
  }

  .page-about .pa-cta {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .pa-cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .pa-hero-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pa-node-a,
  .page-about .pa-node-b {
    animation: none;
  }

  .page-about .pa-tl-body,
  .page-about .pa-eco-card,
  .page-about .pa-chapters-row .toc-link {
    transition: none;
  }

  .page-about .pa-eco-card:hover {
    transform: none;
  }
}
<<<END>>>