.page-about {
  --about-body: #dbe2ef;
  --about-line: rgba(60, 85, 144, 0.5);
  display: block;
  background:
    radial-gradient(1100px 480px at 92% -6%, rgba(53, 224, 214, 0.1), transparent 62%),
    radial-gradient(820px 420px at -8% 4%, rgba(255, 106, 31, 0.13), transparent 66%),
    var(--c-indigo);
  color: var(--c-cream);
}

.page-about .breadcrumb {
  padding: 18px 0 4px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.82rem;
  color: var(--c-mist);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-line);
}

.page-about .breadcrumb-list a {
  color: var(--c-mist);
  text-decoration: none;
}

.page-about .breadcrumb-list a:hover {
  color: var(--c-cyan);
}

.page-about .breadcrumb-list [aria-current="page"] {
  color: var(--c-cream);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: 6px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -130px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 34%, rgba(255, 106, 31, 0.3), rgba(255, 106, 31, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--c-orange), var(--c-cyan) 55%, rgba(53, 224, 214, 0));
  transform: skewY(-0.7deg);
  transform-origin: left center;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  padding-top: 14px;
  padding-bottom: 40px;
}

.page-about .about-hero .section-kicker {
  margin: 0 0 10px;
  font-family: var(--font-narrow);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}

.page-about h1 {
  margin: 0 0 18px;
  max-width: 18em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.75rem, 7vw, 2.9rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-cream);
}

.page-about .about-hero .lede {
  max-width: 34em;
  margin: 0 0 30px;
  font-size: clamp(1rem, 3.6vw, 1.08rem);
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 34px;
  margin: 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .hero-facts li {
  min-width: 96px;
}

.page-about .fact-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--c-cream);
}

.page-about .hero-facts li:first-child .fact-num {
  color: var(--c-orange);
}

.page-about .fact-label {
  display: block;
  margin-top: 4px;
  font-family: var(--font-narrow);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

/* ---------- 满宽横幅 ---------- */
.page-about .about-banner {
  position: relative;
  margin: 0;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: clamp(190px, 38vw, 430px);
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 23, 51, 0.12) 0%, rgba(10, 23, 51, 0.55) 62%, var(--c-indigo) 100%);
  pointer-events: none;
}

.page-about .about-banner .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 14px;
  z-index: 1;
  padding: 0 16px;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--c-mist);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 44px;
  padding-top: 44px;
  padding-bottom: 64px;
}

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

.page-about .about-section {
  max-width: 100%;
  margin: 0 0 48px;
  padding-bottom: 44px;
  border-bottom: 1px solid var(--about-line);
  animation: aboutFadeUp 0.55s ease both;
}

.page-about .about-section:last-child {
  margin-bottom: 0;
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-section > * {
  max-width: 38em;
}

.page-about .about-section > .timeline,
.page-about .about-section > .about-stats,
.page-about .about-section > .about-coast,
.page-about .about-section > .about-figure,
.page-about .about-section > .tabs,
.page-about .about-section > .channel-list {
  max-width: none;
}

@keyframes aboutFadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-about .section-index {
  display: inline-block;
  margin: 0 0 10px;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--c-orange);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--c-orange);
}

.page-about .section-title {
  margin: 0 0 16px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(1.35rem, 5vw, 1.95rem);
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--c-cream);
}

.page-about .prose {
  max-width: 38em;
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--about-body);
}

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

.page-about .about-quote {
  position: relative;
  margin: 30px 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--c-orange);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.15rem, 4.4vw, 1.5rem);
  line-height: 1.6;
  color: var(--c-cream);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-m);
  border: 1px solid var(--about-line);
  object-fit: cover;
}

.page-about .about-figure .media-caption {
  margin-top: 10px;
  font-size: 0.78rem;
  color: var(--c-mist);
}

/* ---------- 标签页 ---------- */
.page-about .tabs {
  margin-top: 26px;
}

.page-about .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .tab {
  margin-bottom: -1px;
  padding: 10px 14px;
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  border-radius: 0;
  font-family: var(--font-narrow);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--c-mist);
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .tab:hover {
  color: var(--c-cyan);
}

.page-about .tab[aria-selected="true"] {
  color: var(--c-cream);
  border-bottom-color: var(--c-orange);
}

.page-about .tab-panel {
  padding: 22px 0 0;
}

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

.page-about .tab-panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-narrow);
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: var(--c-cyan);
}

.page-about .tab-panel p {
  margin: 0 0 12px;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .tab-panel p:last-child {
  margin-bottom: 0;
}

/* ---------- 版本时间轴 ---------- */
.page-about .timeline {
  position: relative;
  display: flex;
  gap: 16px;
  margin-top: 22px;
  padding: 26px 2px 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 31px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--c-orange), var(--c-cyan) 60%, var(--c-line) 100%);
  opacity: 0.6;
}

.page-about .timeline-card {
  position: relative;
  flex: 0 0 250px;
  width: 250px;
  scroll-snap-align: start;
  padding: 20px 18px 18px;
  background: var(--c-indigo-2);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
}

.page-about .timeline-dot {
  position: absolute;
  top: -15px;
  left: 18px;
  display: block;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 31, 0.2);
}

.page-about .timeline-version {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .timeline-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 1.02rem;
  line-height: 1.35;
  color: var(--c-cream);
}

.page-about .timeline-card > p {
  margin: 0 0 14px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--about-body);
}

.page-about .disclosure-trigger {
  width: 100%;
  padding: 8px 13px;
  background: transparent;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  font-family: var(--font-narrow);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  color: var(--c-cyan);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .disclosure-trigger:hover {
  border-color: var(--c-cyan);
}

.page-about .disclosure-trigger[aria-expanded="true"] {
  border-color: var(--c-orange);
  color: var(--c-orange);
}

.page-about .disclosure-panel {
  padding: 12px 2px 0;
}

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

.page-about .disclosure-panel p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 数据卡片 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 26px 0 26px;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  padding: 18px 15px;
  background: var(--c-indigo-2);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
}

.page-about .about-stat .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.6rem;
  line-height: 1.1;
  color: var(--c-orange);
}

.page-about .about-stat .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--c-mist);
}

/* ---------- 内容频道 ---------- */
.page-about .channel-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .channel-item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .channel-item:first-child {
  border-top: 1px solid var(--about-line);
}

.page-about .channel-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--c-amber);
  padding-top: 3px;
}

.page-about .channel-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-narrow);
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  color: var(--c-cream);
}

.page-about .channel-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--about-body);
}

/* ---------- 海南坐标 ---------- */
.page-about .about-coast {
  position: relative;
  margin-top: 22px;
  min-height: 320px;
  border-radius: var(--radius-l);
  border: 1px solid var(--about-line);
  overflow: hidden;
  background: var(--c-indigo-3);
}

.page-about .about-coast-img {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-coast::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(150deg, rgba(10, 23, 51, 0.55) 0%, rgba(10, 23, 51, 0.92) 68%);
  pointer-events: none;
}

.page-about .about-coast-body {
  position: relative;
  z-index: 1;
  padding: 30px 20px 28px;
}

.page-about .about-coast-body p {
  max-width: 36em;
  margin: 0 0 14px;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-coast-body .button {
  margin-top: 8px;
}

/* ---------- 右侧索引 ---------- */
.page-about .about-index {
  align-self: start;
  padding-top: 14px;
  border-top: 2px solid var(--c-orange);
}

.page-about .about-index-title {
  margin: 0 0 12px;
  font-family: var(--font-narrow);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-about .about-index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  font-size: 0.86rem;
  line-height: 1.4;
  color: var(--c-mist);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-index-list a:hover {
  color: var(--c-cream);
  border-color: var(--c-cyan);
}

.page-about .about-index-list .idx {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.76rem;
  color: var(--c-orange);
}

.page-about .about-index-note {
  margin: 16px 0 0;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  padding: 0 0 64px;
}

.page-about .about-cta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-top: 26px;
  border-top: 2px solid var(--c-orange);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 26em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.6;
  color: var(--c-cream);
}

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-section {
    animation: none;
  }

  .page-about .tab,
  .page-about .disclosure-trigger,
  .page-about .about-index-list a {
    transition: none;
  }
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-figure {
    margin-left: 12%;
    max-width: 88%;
  }

  .page-about .about-coast-body {
    padding: 38px 34px 34px;
  }

  .page-about .timeline-card {
    flex: 0 0 272px;
    width: 272px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 232px;
    gap: 60px;
    padding-top: 60px;
    padding-bottom: 84px;
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
  }

  .page-about .about-index-list {
    display: block;
  }

  .page-about .about-index-list li + li {
    margin-top: 2px;
  }

  .page-about .about-index-list a {
    display: flex;
    width: 100%;
    padding: 8px 0 8px 12px;
    border: 0;
    border-left: 2px solid var(--about-line);
    border-radius: 0;
  }

  .page-about .about-index-list a:hover {
    border-left-color: var(--c-cyan);
  }

  .page-about .about-banner .media-caption {
    padding: 0 24px;
  }
}
<<<END>>>