.page-about {
  background: var(--snow);
  color: var(--ink);
}

/* ===== 首屏海报 ===== */
.page-about .about-hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  background: linear-gradient(135deg, #0a2535 0%, #0F3A5A 55%, #13243a 100%);
  color: var(--snow);
}

.page-about .about-hero--bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
  filter: saturate(0.8) contrast(1.1);
}

.page-about .about-hero--inner {
  position: relative;
  z-index: 2;
  padding-top: clamp(72px, 12vh, 140px);
  padding-bottom: 32px;
}

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

.page-about .about-hero--kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: rgba(244, 246, 240, 0.72);
  text-transform: uppercase;
}

.page-about .about-hero--kicker::before {
  content: "";
  width: 34px;
  height: 4px;
  background: linear-gradient(90deg, var(--heat), var(--fluoro));
}

.page-about .about-hero h1 {
  max-width: 15em;
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(2.2rem, 7vw, 4.8rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  text-wrap: balance;
  text-shadow: 0 4px 24px rgba(4, 18, 28, 0.4);
}

.page-about .about-hero--lead {
  max-width: 46em;
  margin: 20px 0 0;
  color: rgba(244, 246, 240, 0.85);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.8;
}

.page-about .about-hero--lead strong {
  color: var(--fluoro);
  font-weight: 700;
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid rgba(244, 246, 240, 0.22);
}

.page-about .about-index a {
  font-family: var(--font-data);
  font-size: 14px;
  color: rgba(244, 246, 240, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 200ms ease, border-color 200ms ease;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--fluoro);
  border-bottom-color: var(--fluoro);
}

.page-about .about-hero--metrics {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  background: rgba(244, 246, 240, 0.08);
  border-top: 1px solid rgba(244, 246, 240, 0.2);
}

.page-about .about-metric {
  padding: 16px 18px;
  border-right: 1px solid rgba(244, 246, 240, 0.12);
  border-bottom: 1px solid rgba(244, 246, 240, 0.12);
  background: rgba(4, 18, 28, 0.35);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.page-about .about-metric b {
  display: block;
  font-family: var(--font-data);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--fluoro);
  margin-bottom: 8px;
}

.page-about .about-metric span {
  display: block;
  font-size: 13px;
  color: rgba(244, 246, 240, 0.72);
}

/* ===== 雪域起点 ===== */
.page-about .about-origin {
  background:
    linear-gradient(120deg, rgba(15, 58, 90, 0.08) 0%, transparent 32%),
    var(--snow);
  padding: clamp(56px, 10vw, 120px) 0;
}

.page-about .about-section-head {
  margin-bottom: 36px;
}

.page-about .about-origin--row {
  display: grid;
  gap: 32px;
}

.page-about .about-origin .prose p {
  margin: 0 0 16px;
  color: var(--ink);
  line-height: 1.9;
  max-width: 46em;
}

.page-about .about-origin--facts {
  background: var(--ice);
  border-left: 4px solid var(--heat);
  padding: 24px 24px 12px;
  margin-top: 12px;
}

.page-about .about-origin--facts h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--plateau);
}

.page-about .about-origin--facts ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-origin--facts li {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(42, 53, 62, 0.12);
}

.page-about .about-origin--facts li:last-child {
  border-bottom: none;
}

.page-about .fact-label {
  font-size: 14px;
  color: var(--steel);
}

.page-about .fact-value {
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  text-align: right;
}

/* ===== 赛事覆盖版图 ===== */
.page-about .about-coverage {
  background: var(--plateau);
  color: var(--snow);
  padding: clamp(56px, 10vw, 120px) 0;
}

.page-about .about-coverage .section-title {
  color: var(--snow);
}

.page-about .about-coverage .section-desc {
  color: rgba(244, 246, 240, 0.7);
}

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

.page-about .about-coverage--banner img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(244, 246, 240, 0.16);
}

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

.page-about .about-coverage--map {
  background: rgba(4, 18, 28, 0.4);
  border: 1px solid rgba(244, 246, 240, 0.12);
  padding: 16px;
}

.page-about .coverage-svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .about-coverage--map .map-area {
  fill: rgba(244, 246, 240, 0.08);
  stroke: rgba(244, 246, 240, 0.35);
  stroke-width: 1.5;
  transition: fill 200ms ease, stroke 200ms ease;
}

.page-about .about-coverage--map .map-name {
  fill: rgba(244, 246, 240, 0.82);
  font-family: var(--font-data);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  pointer-events: none;
  transition: fill 200ms ease;
}

.page-about .about-coverage--map .map-datalink {
  fill: none;
  stroke: rgba(0, 230, 118, 0.4);
  stroke-width: 1.5;
  stroke-dasharray: 5 7;
}

.page-about .about-coverage--map .map-group:hover .map-area {
  fill: rgba(255, 107, 53, 0.32);
  stroke: var(--heat);
}

.page-about .about-coverage--map .map-group:hover .map-name {
  fill: var(--snow);
}

.page-about .about-coverage--map .map-champions .map-area {
  fill: rgba(255, 107, 53, 0.15);
  stroke: rgba(255, 107, 53, 0.6);
}

.page-about .about-coverage--map .map-champions:hover .map-area {
  fill: rgba(255, 107, 53, 0.5);
}

.page-about .about-coverage--list {
  padding-top: 4px;
}

.page-about .about-coverage--list h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 20px;
  color: var(--snow);
}

.page-about .coverage-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .coverage-list li {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(244, 246, 240, 0.14);
}

.page-about .coverage-code {
  font-family: var(--font-data);
  font-weight: 700;
  color: var(--snow);
}

.page-about .coverage-status {
  font-size: 14px;
  color: rgba(244, 246, 240, 0.7);
}

.page-about .about-coverage--promise {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 20px 0 0;
  font-family: var(--font-data);
  font-size: 15px;
  color: var(--fluoro);
}

/* ===== 技术信念 ===== */
.page-about .about-tech {
  background: var(--ice);
  padding: clamp(56px, 10vw, 120px) 0;
}

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

.page-about .about-tech--steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-tech--step {
  background: var(--snow);
  border-left: 4px solid var(--heat);
  padding: 20px;
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
}

.page-about .about-tech--step h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--ink);
}

.page-about .about-tech--step p {
  margin: 0;
  color: var(--steel);
  line-height: 1.75;
  font-size: 15px;
}

.page-about .step-index {
  font-family: var(--font-data);
  font-size: 32px;
  font-weight: 700;
  color: var(--plateau);
  line-height: 1;
}

.page-about .about-tech--figure {
  margin: 0;
  padding: 8px;
  background: var(--plateau);
  border: 1px solid rgba(15, 58, 90, 0.2);
}

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

.page-about .about-tech--figure figcaption {
  padding: 12px 8px 8px;
  font-family: var(--font-data);
  font-size: 13px;
  color: rgba(244, 246, 240, 0.78);
}

.page-about .about-tech--note {
  margin: 28px 0 0;
  padding: 18px 20px;
  background: rgba(255, 107, 53, 0.12);
  border-left: 4px solid var(--heat);
  color: var(--ink);
  line-height: 1.7;
}

.page-about .about-tech--note a {
  color: var(--heat);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 53, 0.4);
}

/* ===== 里程碑时间轴 ===== */
.page-about .about-milestones {
  background: var(--snow);
  padding: clamp(56px, 10vw, 120px) 0;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  border-left: 2px solid rgba(15, 58, 90, 0.18);
  display: grid;
  gap: 36px;
}

.page-about .about-timeline li {
  position: relative;
  max-width: 46em;
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 8px;
  width: 14px;
  height: 14px;
  background: var(--heat);
  border: 4px solid var(--snow);
  box-shadow: 0 0 0 2px rgba(255, 107, 53, 0.6);
  transition: transform 200ms ease, background 200ms ease, box-shadow 200ms ease;
}

.page-about .about-timeline li:hover::before {
  transform: rotate(45deg);
  background: var(--fluoro);
  box-shadow: 0 0 0 2px rgba(0, 230, 118, 0.5);
}

.page-about .timeline-marker {
  display: inline-block;
  padding: 6px 12px;
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 700;
  color: var(--plateau);
  background: var(--ice);
  border-left: 3px solid var(--heat);
  transition: background 200ms ease, color 200ms ease;
}

.page-about .about-timeline li:hover .timeline-marker {
  background: var(--fluoro);
  color: var(--ink);
}

.page-about .about-timeline p {
  margin: 10px 0 0;
  color: var(--ink);
  line-height: 1.8;
  font-size: 15px;
}

.page-about .about-milestones--note {
  margin: 44px 0 0;
  color: var(--steel);
  line-height: 1.7;
}

.page-about .about-milestones--note a {
  color: var(--plateau);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid rgba(15, 58, 90, 0.4);
}

/* ===== 继续使用半岛 ===== */
.page-about .about-next {
  background: var(--indigo);
  padding: clamp(52px, 8vw, 96px) 0;
  color: var(--snow);
}

.page-about .about-next .section-title {
  color: var(--snow);
  margin-bottom: 16px;
}

.page-about .about-next--lead {
  max-width: 40em;
  margin: 0 0 28px;
  color: rgba(244, 246, 240, 0.8);
  line-height: 1.8;
}

.page-about .about-next--links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-next--links .btn-ghost {
  border-color: rgba(244, 246, 240, 0.6);
  color: var(--snow);
}

.page-about .about-next--links .btn-primary {
  border-color: var(--heat);
  background: var(--heat);
  color: var(--snow);
}

/* ===== 桌面端布局 ===== */
@media (min-width: 768px) {
  .page-about .about-hero--metrics {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-metric {
    padding: 22px 24px;
  }

  .page-about .about-origin--row {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }

  .page-about .about-coverage--row {
    grid-template-columns: 380px 1fr;
    align-items: start;
  }

  .page-about .about-tech--grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-coverage--content {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }
}