/* ==========================================================
   品牌与场地 / page-about
   ========================================================== */

.page-about {
  position: relative;
  background: var(--deep);
  color: var(--ice);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  font-size: 0.82rem;
  color: var(--mist);
}
.page-about .breadcrumbs .crumb {
  color: var(--mist);
  text-decoration: none;
}
.page-about .breadcrumbs a.crumb:hover,
.page-about .breadcrumbs a.crumb:focus-visible {
  color: var(--cyan-soft);
}
.page-about .breadcrumbs .crumb[aria-current="page"] {
  color: var(--cyan);
}
.page-about .crumb-sep {
  color: rgba(140, 166, 191, 0.55);
}

/* ---------- 共用小标 ---------- */
.page-about .eyebrow {
  margin: 0 0 14px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-open {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 42px) 0 50px;
}
.page-about .about-open::before {
  content: "";
  position: absolute;
  left: -22%;
  right: -14%;
  top: -210px;
  height: 880px;
  pointer-events: none;
  background:
    radial-gradient(52% 58% at 22% 34%, rgba(31, 224, 208, 0.2), transparent 66%),
    radial-gradient(46% 52% at 84% 12%, rgba(168, 85, 247, 0.2), transparent 68%),
    radial-gradient(42% 48% at 62% 96%, rgba(255, 122, 69, 0.16), transparent 72%);
}
.page-about .about-open-grid {
  position: relative;
  display: grid;
  gap: 38px;
}
.page-about .about-open-copy {
  min-width: 0;
}

.page-about .about-open .display-title {
  margin: 0 0 24px;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 6.4vw, 3.9rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.005em;
  color: var(--ice);
}
.page-about .about-open .display-title::after {
  content: "";
  display: block;
  width: 116px;
  height: 8px;
  margin-top: 22px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan) 0 42%, rgba(31, 224, 208, 0.24) 42% 100%);
  transform: skewX(-24deg) translateX(-6px);
}

.page-about .about-open .lede {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: clamp(1rem, 1.7vw, 1.1rem);
  line-height: 1.85;
  color: rgba(234, 246, 255, 0.9);
}
.page-about .about-open .note {
  margin: 0;
  max-width: 60ch;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .about-open .note a {
  color: var(--cyan-soft);
  text-underline-offset: 3px;
  text-decoration-color: rgba(123, 245, 234, 0.42);
}

.page-about .about-open-figure {
  position: relative;
  margin: 0;
}
.page-about .about-open-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid rgba(31, 224, 208, 0.22);
  box-shadow: var(--shadow-lift);
}
.page-about .about-open-figure::after {
  content: "";
  position: absolute;
  right: -16px;
  bottom: -16px;
  width: 104px;
  height: 104px;
  border-radius: 50%;
  border: 1px solid rgba(31, 224, 208, 0.34);
  pointer-events: none;
}

.page-about .media-caption {
  margin-top: 12px;
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--mist);
}

/* 首屏数据 */
.page-about .about-open-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px dashed rgba(140, 166, 191, 0.3);
}
.page-about .about-stat {
  min-width: 0;
}
.page-about .about-stat .stat-num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.page-about .about-stat .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-chronicle-wrap {
  padding: 22px 0 26px;
}
.page-about .chronicle-index-band {
  display: grid;
  gap: 12px;
  padding-bottom: 22px;
  margin-bottom: 48px;
  border-bottom: 1px solid rgba(31, 224, 208, 0.14);
}
.page-about .chronicle-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .chronicle-chip {
  display: inline-flex;
  align-items: center;
  padding: 9px 17px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(140, 166, 191, 0.32);
  background: rgba(10, 33, 54, 0.7);
  color: rgba(234, 246, 255, 0.86);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: border-color 0.24s var(--ease), color 0.24s var(--ease), background-color 0.24s var(--ease);
}
.page-about .chronicle-chip:hover,
.page-about .chronicle-chip:focus-visible {
  border-color: rgba(31, 224, 208, 0.72);
  color: var(--cyan-soft);
  background: rgba(18, 58, 90, 0.84);
}

/* ---------- 长卷时间线 ---------- */
.page-about .chronicle {
  position: relative;
}
.page-about .chronicle-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 58px;
}
.page-about .chronicle-item:last-child {
  padding-bottom: 8px;
}

.page-about .chronicle-label {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(31, 224, 208, 0.36);
  background: rgba(10, 33, 54, 0.86);
  font-size: 0.94rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--cyan);
  text-decoration: none;
  white-space: nowrap;
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), color 0.28s var(--ease);
}
.page-about .chronicle-label:hover,
.page-about .chronicle-label:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  color: var(--cyan-soft);
}
.page-about .chronicle-label--violet {
  border-color: rgba(168, 85, 247, 0.46);
  color: #c8a4ff;
}
.page-about .chronicle-label--coral {
  border-color: rgba(255, 122, 69, 0.46);
  color: #ffa57f;
}

.page-about .chronicle-body {
  min-width: 0;
}
.page-about .chronicle-body .section-title {
  margin: 0 0 20px;
  max-width: 26ch;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 2.05rem);
  font-weight: 800;
  line-height: 1.32;
  color: var(--ice);
}
.page-about .chronicle-body > p {
  margin: 0 0 18px;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(234, 246, 255, 0.86);
}
.page-about .chronicle-body > p:last-child {
  margin-bottom: 0;
}
.page-about .chronicle-item:nth-of-type(2) .chronicle-body > p {
  max-width: 58ch;
}
.page-about .chronicle-item:nth-of-type(4) .chronicle-body > p {
  max-width: 62ch;
}
.page-about .chronicle-body .note {
  margin: 24px 0 0;
  max-width: 64ch;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist);
}
.page-about .chronicle-body .note a {
  color: var(--cyan-soft);
  text-underline-offset: 3px;
  text-decoration-color: rgba(123, 245, 234, 0.42);
}

/* 定位高亮 */
.page-about .chronicle-item:target .section-title {
  animation: aboutTitlePulse 1.5s var(--ease) 1;
}
@keyframes aboutTitlePulse {
  0% { color: var(--ice); }
  22% { color: var(--cyan-soft); }
  100% { color: var(--ice); }
}

/* ---------- 地域：图片 + 内联 SVG + 卡片 ---------- */
.page-about .geo-figure {
  margin: 32px 0 0;
}
.page-about .geo-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid rgba(140, 166, 191, 0.2);
}

.page-about .geo-diagram {
  margin-top: 24px;
  padding: 20px 14px;
  border-radius: var(--r-lg);
  background: linear-gradient(158deg, rgba(10, 33, 54, 0.92), rgba(4, 16, 31, 0.72));
  border: 1px solid rgba(31, 224, 208, 0.14);
}
.page-about .geo-svg {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .geo-svg .geo-block rect {
  fill-opacity: 0.16;
  stroke-width: 1.5;
}
.page-about .geo-svg .geo-block text {
  font-family: var(--font-body);
  font-size: 30px;
  font-weight: 600;
  text-anchor: middle;
}
.page-about .geo-block--sh rect {
  fill: var(--cyan);
  stroke: rgba(31, 224, 208, 0.74);
}
.page-about .geo-block--sh text {
  fill: var(--cyan-soft);
}
.page-about .geo-block--cq rect {
  fill: var(--coral);
  stroke: rgba(255, 122, 69, 0.74);
}
.page-about .geo-block--cq text {
  fill: #ffb899;
}
.page-about .geo-block--wz rect {
  fill: var(--violet);
  stroke: rgba(168, 85, 247, 0.74);
}
.page-about .geo-block--wz text {
  fill: #d6b8ff;
}
.page-about .geo-block--cs rect {
  fill: var(--amber);
  stroke: rgba(255, 197, 61, 0.74);
}
.page-about .geo-block--cs text {
  fill: #ffdf9b;
}

.page-about .geo-legend {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .geo-card {
  padding: 18px 18px 20px;
  border-radius: var(--r-md);
  background: rgba(10, 33, 54, 0.72);
  border: 1px solid rgba(140, 166, 191, 0.2);
  border-top: 3px solid var(--mist);
  transition: transform 0.3s var(--ease), background-color 0.3s var(--ease);
}
.page-about .geo-card:hover,
.page-about .geo-card:focus-within {
  transform: translateY(-4px);
  background: rgba(18, 58, 90, 0.82);
}
.page-about .geo-card--cyan {
  border-top-color: var(--cyan);
}
.page-about .geo-card--coral {
  border-top-color: var(--coral);
}
.page-about .geo-card--violet {
  border-top-color: var(--violet);
}
.page-about .geo-card--amber {
  border-top-color: var(--amber);
}
.page-about .geo-card-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--ice);
}
.page-about .geo-card-text {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 档位刻度 ---------- */
.page-about .tier-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .tier-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: linear-gradient(104deg, rgba(18, 58, 90, 0.6), rgba(10, 33, 54, 0.42));
  border: 1px solid rgba(140, 166, 191, 0.18);
  border-left: 3px solid var(--cyan);
  transition: transform 0.3s var(--ease), background-color 0.3s var(--ease);
}
.page-about .tier-item:hover {
  transform: translateX(4px);
  background: linear-gradient(104deg, rgba(18, 58, 90, 0.82), rgba(10, 33, 54, 0.6));
}
.page-about .tier-index {
  font-family: var(--font-num);
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.08em;
  padding-top: 3px;
  color: rgba(31, 224, 208, 0.5);
}
.page-about .tier-main {
  min-width: 0;
}
.page-about .tier-name {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--ice);
}
.page-about .tier-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 11px;
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--deep);
  background: var(--cyan);
}
.page-about .tier-copy {
  margin: 0;
  font-size: 0.91rem;
  line-height: 1.78;
  color: rgba(234, 246, 255, 0.78);
}
.page-about .tier-item--a {
  border-left-color: var(--cyan-soft);
}
.page-about .tier-item--a .tier-tag {
  background: var(--cyan-soft);
}
.page-about .tier-item--c {
  border-left-color: var(--violet);
}
.page-about .tier-item--c .tier-tag {
  background: var(--violet);
  color: #ffffff;
}
.page-about .tier-item--d {
  border-left-color: var(--coral);
}
.page-about .tier-item--d .tier-tag {
  background: var(--coral);
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  gap: 26px;
}
.page-about .team-copy {
  min-width: 0;
}
.page-about .team-figure {
  margin: 0;
}
.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-md);
  border: 1px solid rgba(140, 166, 191, 0.22);
}
.page-about .fact-line {
  margin: 22px 0 0;
  padding: 14px 18px;
  border-radius: var(--r-md);
  border-left: 3px solid var(--cyan);
  background: rgba(18, 58, 90, 0.5);
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(234, 246, 255, 0.82);
}

/* ---------- 里程碑胶囊 ---------- */
.page-about .milestone-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.page-about .milestone-tags .pill--about {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(255, 197, 61, 0.4);
  background: rgba(255, 197, 61, 0.08);
  color: var(--amber);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding: 16px 0 92px;
}
.page-about .cta-panel {
  position: relative;
  overflow: hidden;
  padding: 38px 22px 42px;
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, rgba(18, 58, 90, 0.92), rgba(4, 16, 31, 0.86) 62%);
  border: 1px solid rgba(31, 224, 208, 0.2);
}
.page-about .cta-panel::before {
  content: "";
  position: absolute;
  right: -120px;
  top: -150px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(31, 224, 208, 0.2), transparent 68%);
}
.page-about .cta-panel > .eyebrow,
.page-about .cta-panel > .section-title,
.page-about .cta-panel > p,
.page-about .cta-actions,
.page-about .cta-tags {
  position: relative;
}
.page-about .cta-panel .section-title {
  margin: 0 0 16px;
  max-width: 24ch;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--ice);
}
.page-about .cta-panel > p {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(234, 246, 255, 0.85);
}
.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.page-about .cta-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 34px 0 0;
  padding: 26px 0 0;
  border-top: 1px dashed rgba(140, 166, 191, 0.28);
}
.page-about .cta-tags .pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(140, 166, 191, 0.34);
  background: rgba(4, 16, 31, 0.6);
  color: rgba(234, 246, 255, 0.8);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
}
.page-about .cta-note {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .cta-note a {
  color: var(--cyan-soft);
  text-underline-offset: 3px;
  text-decoration-color: rgba(123, 245, 234, 0.4);
}

/* ==========================================================
   响应式
   ========================================================== */
@media (min-width: 640px) {
  .page-about .about-open-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px 18px;
  }
  .page-about .geo-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .geo-diagram {
    padding: 26px 22px;
  }
  .page-about .cta-panel {
    padding: 48px 40px 52px;
  }
}

@media (min-width: 860px) {
  .page-about .chronicle-index-band {
    grid-template-columns: minmax(0, auto) minmax(0, 1fr);
    align-items: center;
    gap: 32px;
    margin-bottom: 64px;
  }
  .page-about .team-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 42px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .chronicle-item {
    grid-template-columns: 136px minmax(0, 1fr);
    gap: 0 60px;
    padding-bottom: 78px;
  }
  .page-about .chronicle::before {
    content: "";
    position: absolute;
    top: 14px;
    bottom: 56px;
    left: 166px;
    width: 1px;
    background: linear-gradient(180deg,
      rgba(31, 224, 208, 0) 0%,
      rgba(31, 224, 208, 0.6) 8%,
      rgba(31, 224, 208, 0.32) 30%,
      rgba(168, 85, 247, 0.38) 56%,
      rgba(255, 122, 69, 0.34) 80%,
      rgba(255, 197, 61, 0) 100%);
  }
  .page-about .chronicle-item::before {
    content: "";
    position: absolute;
    left: 160px;
    top: 12px;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--deep);
    border: 2px solid var(--cyan);
    box-shadow: 0 0 0 5px rgba(31, 224, 208, 0.12);
  }
  .page-about .chronicle-item:nth-of-type(2)::before {
    border-color: var(--violet);
    box-shadow: 0 0 0 5px rgba(168, 85, 247, 0.14);
  }
  .page-about .chronicle-item:nth-of-type(3)::before {
    border-color: var(--cyan-soft);
    box-shadow: 0 0 0 5px rgba(123, 245, 234, 0.13);
  }
  .page-about .chronicle-item:nth-of-type(4)::before {
    border-color: var(--cyan);
    box-shadow: 0 0 0 5px rgba(31, 224, 208, 0.12);
  }
  .page-about .chronicle-item:nth-of-type(5)::before {
    border-color: var(--coral);
    box-shadow: 0 0 0 5px rgba(255, 122, 69, 0.14);
  }
  .page-about .chronicle-label {
    justify-self: end;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    margin-top: 2px;
  }
}

@media (min-width: 980px) {
  .page-about .about-open {
    padding: calc(var(--header-h) + 58px) 0 66px;
  }
  .page-about .about-open-grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    gap: 26px 58px;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .geo-legend {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .cta-panel {
    padding: 56px 54px 60px;
  }
}

/* ==========================================================
   动效收敛
   ========================================================== */
@media (prefers-reduced-motion: reduce) {
  .page-about .chronicle-item:target .section-title {
    animation: none;
  }
  .page-about .geo-card,
  .page-about .chronicle-chip,
  .page-about .chronicle-label,
  .page-about .tier-item {
    transition: none;
  }
  .page-about .geo-card:hover,
  .page-about .geo-card:focus-within,
  .page-about .tier-item:hover,
  .page-about .chronicle-label:hover,
  .page-about .chronicle-label:focus-visible {
    transform: none;
  }
}