.page-about {
  --ab-glow: radial-gradient(120% 90% at 10% 0%, rgba(0, 229, 199, 0.18), transparent 62%);
  --ab-panel: linear-gradient(165deg, #0E2742 0%, #0A1B31 100%);
  --ab-line-soft: rgba(42, 74, 102, 0.62);
  color: var(--mist);
  font-family: var(--font-cn);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-shell {
  display: block;
}

.page-about .anchor-rail {
  margin-bottom: 26px;
}

.page-about .about-body {
  min-width: 0;
}

@media (min-width: 960px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: 182px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }
  .page-about .anchor-rail {
    position: sticky;
    top: 104px;
    margin-bottom: 0;
  }
}

/* ---------- 刊头 ---------- */
.page-about .about-masthead {
  position: relative;
  padding: clamp(24px, 4.4vw, 52px);
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--ab-glow), linear-gradient(170deg, #0B1F3A 0%, #071427 100%);
  overflow: hidden;
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--cyan) 0 2px, transparent 2px 14px);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .breadcrumb {
  margin-bottom: 20px;
}

.page-about .about-kicker-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-bottom: 18px;
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-title {
  margin: 0 0 18px;
  font-size: clamp(28px, 5.2vw, 54px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.015em;
}

.page-about .about-lede {
  max-width: 64ch;
  margin: 0 0 30px;
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.85;
  color: #C6DCE6;
}

.page-about .about-facts {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .about-facts li {
  border-top: 2px solid var(--cyan);
  padding-top: 10px;
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-fact-num span {
  font-size: 0.56em;
  color: var(--cyan);
  margin-left: 3px;
}

.page-about .about-fact-label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .about-cover {
  margin: 0;
}

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

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  margin-top: clamp(56px, 9vw, 104px);
  scroll-margin-top: 110px;
}

.page-about .sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding-bottom: 14px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .sec-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .sec-title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .sec-note {
  margin-left: auto;
  font-size: 13px;
  color: var(--steel);
}

.page-about .about-text {
  margin: 0 0 18px;
  max-width: 72ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: #C6DCE6;
}

.page-about .about-text:last-child {
  margin-bottom: 0;
}

.page-about .about-text--note {
  margin-top: 22px;
  padding-left: 14px;
  border-left: 2px solid var(--ab-line-soft);
  font-size: 15px;
  color: var(--steel);
}

.page-about .about-grid-asym {
  display: grid;
  gap: 26px;
}

@media (min-width: 880px) {
  .page-about .about-grid-asym {
    grid-template-columns: 1.35fr 1fr;
    align-items: start;
  }
  .page-about .about-grid-asym--flip {
    grid-template-columns: 1fr 1.3fr;
  }
}

/* ---------- 定位：三根支柱 ---------- */
.page-about .about-pillars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-pillar {
  position: relative;
  padding: 18px 18px 20px 22px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--r);
  background: var(--ab-panel);
}

.page-about .about-pillar::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 99px;
  background: var(--cyan);
}

.page-about .about-pillar .card-title {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-pillar .card-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(42, 74, 102, 0.5) 55%, transparent);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--trench);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 199, 0.12);
}

.page-about .tl-item--now::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 69, 0.16);
}

.page-about .tl-year {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  border: 1px solid var(--ab-line-soft);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .tl-item--now .tl-year {
  color: var(--orange);
  border-color: rgba(255, 122, 69, 0.5);
}

.page-about .tl-card {
  padding: 16px 18px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--r);
  background: rgba(14, 39, 66, 0.55);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .tl-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-tl-figure {
  margin: 30px 0 0;
}

@media (min-width: 760px) {
  .page-about .tl {
    max-width: 720px;
  }
}

/* ---------- 覆盖规模 ---------- */
.page-about .about-coverage-figure {
  margin: 0;
}

.page-about .about-coverage-body {
  min-width: 0;
}

.page-about .cover-stats {
  list-style: none;
  margin: 24px 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .cover-stat {
  padding: 14px 16px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--r);
  background: rgba(11, 31, 58, 0.55);
}

.page-about .cover-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  color: var(--mist);
}

.page-about .cover-stat-num span {
  font-size: 0.55em;
  margin-left: 3px;
  color: var(--cyan);
}

.page-about .cover-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--steel);
}

.page-about .cover-stat-note {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
  opacity: 0.5;
  transition: opacity 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .cover-stat:hover .cover-stat-note,
.page-about .cover-stat:focus-within .cover-stat-note {
  opacity: 1;
  color: var(--cyan);
}

.page-about .split {
  margin-bottom: 6px;
}

.page-about .split-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--steel);
}

.page-about .split-head b {
  color: var(--mist);
  font-weight: 600;
}

.page-about .split-track {
  display: flex;
  height: 12px;
  border-radius: 99px;
  overflow: hidden;
  background: rgba(42, 74, 102, 0.45);
}

.page-about .split-track span {
  display: block;
  height: 100%;
}

.page-about .split-a {
  background: linear-gradient(90deg, var(--cyan), var(--green));
}

.page-about .split-b {
  background: linear-gradient(90deg, #2A4A66, var(--cyan));
}

/* ---------- 运营支持 ---------- */
.page-about .support-grid {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .support-card {
  padding: 18px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--r);
  background: var(--ab-panel);
}

.page-about .support-title {
  margin: 8px 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .support-value {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
  word-break: break-word;
}

.page-about .support-card .card-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--steel);
}

@media (min-width: 760px) {
  .page-about .support-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 合作生态 ---------- */
.page-about .eco-list {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .eco {
  padding: 16px 18px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--r);
  background: rgba(14, 39, 66, 0.5);
}

.page-about .eco summary {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--mist);
}

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

.page-about .eco summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
}

.page-about .eco[open] summary::after {
  content: "–";
}

.page-about .eco .card-text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .credit-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .credit-list li {
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--cyan);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .credit-list strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .credit-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 未来方向 ---------- */
.page-about .future-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .future-card {
  padding: 22px 20px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(0, 229, 199, 0.07), transparent 60%), var(--ab-panel);
}

.page-about .future-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .future-card h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .future-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

@media (min-width: 820px) {
  .page-about .future-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(56px, 8vw, 96px);
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: radial-gradient(100% 130% at 100% 0%, rgba(255, 122, 69, 0.14), transparent 58%), var(--ab-panel);
}

.page-about .cta-title {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 800;
}

.page-about .cta-text {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: #C6DCE6;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 16px;
}

.page-about .cta-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .cta-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}