.page-about {
  --about-halo-cyan: rgba(61, 242, 208, 0.16);
  --about-halo-violet: rgba(155, 140, 255, 0.14);
  --about-grid-line: rgba(30, 43, 74, 0.55);
  --about-gap: clamp(1.1rem, 3vw, 1.75rem);
  color: var(--cream);
}

.page-about .breadcrumb {
  padding-block: 1rem 0.25rem;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 5vw, 3.5rem) clamp(2.25rem, 6vw, 4.5rem);
  border-bottom: var(--border);
  background:
    radial-gradient(58% 60% at 90% 6%, var(--about-halo-cyan), transparent 72%),
    radial-gradient(46% 52% at 2% 92%, var(--about-halo-violet), transparent 70%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, var(--about-grid-line) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, var(--about-grid-line) 0 1px, transparent 1px 72px);
  opacity: 0.5;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: end;
}

.page-about .about-hero-copy h1 {
  margin: 0.5rem 0 0;
  font-size: clamp(2.05rem, 8vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 800;
  max-width: 18ch;
  text-wrap: balance;
}

.page-about .about-hero-lead {
  margin: 1.1rem 0 0;
  max-width: 60ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--cream);
  opacity: 0.9;
}

.page-about .about-hero-points {
  list-style: none;
  margin: 1.35rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-hero-points li {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: var(--fs-14);
  color: var(--slate);
  line-height: 1.6;
}

.page-about .about-hero-actions {
  margin-top: 1.65rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero-figure {
  margin: 0;
}

.page-about .about-hero-figure .media-frame {
  border: var(--border);
  box-shadow: var(--shadow-hard);
  background: var(--indigo);
}

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

.page-about .media-caption {
  margin-top: 0.65rem;
  font-size: var(--fs-12);
  letter-spacing: 0.02em;
  color: var(--slate);
}

/* 章节跳转 */
.page-about .about-toc {
  background: var(--indigo);
  border-bottom: var(--border);
}

.page-about .about-toc-inner {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding-block: 0.7rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc-label {
  flex: 0 0 auto;
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--slate);
}

.page-about .about-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.4rem;
}

.page-about .about-toc-list a {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--steel);
  border-radius: var(--radius);
  font-size: var(--fs-12);
  color: var(--cream);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(61, 242, 208, 0.08);
}

/* 统计条 */
.page-about .about-stats-section {
  padding-block: clamp(1.4rem, 4vw, 2.2rem);
  border-bottom: var(--border);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: var(--border);
  box-shadow: var(--shadow-hard);
}

.page-about .about-stat {
  background: var(--ink);
  padding: 0.95rem 0.9rem;
  display: grid;
  gap: 0.35rem;
  align-content: start;
}

.page-about .about-stat-num {
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stat:nth-child(3) .about-stat-num {
  color: var(--orange);
}

.page-about .about-stat:nth-child(4) .about-stat-num {
  color: var(--sand);
}

.page-about .about-stat-unit {
  font-size: 0.6em;
  margin-left: 0.1em;
}

.page-about .about-stat-label {
  font-size: var(--fs-12);
  line-height: 1.5;
  color: var(--slate);
}

/* 通用章节头 */
.page-about .about-section-head {
  margin-bottom: clamp(1.3rem, 3.5vw, 2rem);
  max-width: 62ch;
}

.page-about .about-section-head--tight {
  margin-bottom: 1.1rem;
}

.page-about .about-section-head h2 {
  margin: 0.45rem 0 0;
  font-size: clamp(1.5rem, 4.6vw, 2.4rem);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .about-section-lead {
  margin: 0.8rem 0 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-inline-link {
  display: inline-block;
  margin-top: 0.9rem;
  font-size: var(--fs-14);
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 242, 208, 0.45);
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cream);
}

/* 品牌宣言 */
.page-about .about-declaration-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-statement {
  margin: 0.45rem 0 0;
  font-size: clamp(1.6rem, 5.4vw, 2.9rem);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.page-about .about-declaration-text {
  margin: 1rem 0 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--cream);
  opacity: 0.86;
  max-width: 68ch;
}

.page-about .about-declaration-links {
  margin-top: 1.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
}

.page-about .about-quote {
  position: relative;
  margin: 0;
  padding: 1.4rem 1.2rem 1.3rem;
  background: var(--indigo);
  border: var(--border);
  border-left: 4px solid var(--sand);
  box-shadow: var(--shadow-soft);
}

.page-about .about-quote-mark {
  margin: 0;
  font-size: 2.6rem;
  line-height: 0.7;
  color: var(--sand);
  font-weight: 700;
}

.page-about .about-quote-text {
  margin: 0.6rem 0 0;
  font-size: var(--fs-18);
  line-height: 1.7;
  color: var(--cream);
}

.page-about .about-quote-source {
  margin: 0.9rem 0 0;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--slate);
}

/* 玩家场景 */
.page-about .about-problem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.page-about .about-problem-card {
  padding: 1.15rem 1.1rem 1.25rem;
  background: var(--indigo);
  border: var(--border);
  border-top: 4px solid var(--steel);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s var(--ease), border-top-color 0.2s var(--ease);
}

.page-about .about-problem-card--cyan {
  border-top-color: var(--cyan);
}

.page-about .about-problem-card--orange {
  border-top-color: var(--orange);
}

.page-about .about-problem-card--sand {
  border-top-color: var(--sand);
}

.page-about .about-problem-card:hover {
  transform: translate(-2px, -2px);
}

.page-about .about-problem-index {
  display: inline-block;
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--slate);
  letter-spacing: 0.08em;
}

.page-about .about-problem-card h3 {
  margin: 0.35rem 0 0;
  font-size: var(--fs-18);
  line-height: 1.4;
  font-weight: 700;
}

.page-about .about-problem-card p {
  margin: 0.6rem 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--slate);
}

/* 更新节奏 */
.page-about .about-freshness {
  background: var(--indigo);
  border-block: var(--border);
}

.page-about .about-freshness-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-refresh-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.page-about .about-refresh {
  padding: 1.05rem 1rem;
  background: var(--ink);
  border: var(--border);
  box-shadow: var(--shadow-soft);
}

.page-about .about-refresh-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.page-about .about-refresh-cycle {
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .about-refresh h3 {
  margin: 0.65rem 0 0;
  font-size: var(--fs-16);
  line-height: 1.45;
  font-weight: 700;
}

.page-about .about-refresh p {
  margin: 0.5rem 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--slate);
}

/* 团队 */
.page-about .about-team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-team-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.page-about .about-role {
  padding: 1.05rem 1rem;
  border: var(--border);
  background: var(--ink);
}

.page-about .about-role--main {
  background: linear-gradient(160deg, rgba(61, 242, 208, 0.1), transparent 62%), var(--ink);
  border-color: var(--steel);
}

.page-about .about-role--accent {
  background: linear-gradient(160deg, rgba(255, 138, 61, 0.1), transparent 62%), var(--ink);
}

.page-about .about-role-num {
  display: block;
  font-size: clamp(1.8rem, 6vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cream);
}

.page-about .about-role--main .about-role-num {
  color: var(--cyan);
}

.page-about .about-role--accent .about-role-num {
  color: var(--orange);
}

.page-about .about-role h3 {
  margin: 0.4rem 0 0;
  font-size: var(--fs-18);
  font-weight: 700;
}

.page-about .about-role p {
  margin: 0.5rem 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-team-figure {
  margin: 0;
  align-self: stretch;
}

.page-about .about-team-figure .media-frame {
  border: var(--border);
  box-shadow: var(--shadow-hard);
  background: var(--indigo);
}

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

.page-about .about-team-disclosures {
  margin-top: clamp(1.4rem, 4vw, 2.2rem);
  display: grid;
  gap: 0.7rem;
}

.page-about .about-disclosure-title {
  margin: 0;
  font-size: inherit;
  font-weight: 700;
}

.page-about .disclosure {
  border: var(--border);
  background: var(--indigo);
}

.page-about .disclosure-btn {
  width: 100%;
  text-align: left;
  padding: 0.9rem 1rem;
  background: none;
  border: 0;
  color: var(--cream);
  font: inherit;
  font-size: var(--fs-16);
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
}

.page-about .disclosure-btn::after {
  content: "+";
  color: var(--cyan);
  font-weight: 700;
  flex: 0 0 auto;
}

.page-about .disclosure-btn[aria-expanded="true"]::after {
  content: "−";
}

.page-about .disclosure-btn:hover,
.page-about .disclosure-btn:focus-visible {
  color: var(--cyan);
}

.page-about .disclosure-panel {
  padding: 0 1rem 1rem;
}

.page-about .disclosure-panel p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--slate);
}

/* 发展历程 */
.page-about .about-stages-wrap {
  border: var(--border);
  background: var(--indigo);
  box-shadow: var(--shadow-hard);
  padding: 1rem;
}

.page-about .about-stage-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.1rem;
}

.page-about .about-stage-tabs .tab {
  padding: 0.42rem 0.85rem;
  border: 1px solid var(--steel);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--slate);
  font: inherit;
  font-size: var(--fs-14);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-stage-tabs .tab[aria-selected="true"] {
  border-color: var(--cyan);
  color: var(--ink);
  background: var(--cyan);
  font-weight: 700;
}

.page-about .about-stage-tabs .tab:focus-visible {
  outline: 2px solid var(--sand);
  outline-offset: 2px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.35rem;
  position: relative;
  display: grid;
  gap: 1.2rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--sand), rgba(232, 195, 122, 0.15));
}

.page-about .about-timeline-item {
  position: relative;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -1.35rem;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sand);
  box-shadow: 0 0 0 3px rgba(232, 195, 122, 0.18);
}

.page-about .about-timeline-year {
  display: inline-block;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--sand);
  border: 1px solid rgba(232, 195, 122, 0.4);
  border-radius: var(--radius);
  padding: 0.08rem 0.45rem;
}

.page-about .about-timeline-item h3 {
  margin: 0.5rem 0 0;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.45;
}

.page-about .about-timeline-item p {
  margin: 0.4rem 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-timeline-figure {
  margin: clamp(1.3rem, 4vw, 2rem) 0 0;
}

.page-about .about-timeline-figure .media-frame {
  border: var(--border);
  background: var(--ink);
}

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

/* 合作生态 */
.page-about .about-partners {
  background: var(--indigo);
  border-block: var(--border);
}

.page-about .about-partners-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-partner-band {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.9rem;
  border: var(--border);
  background: var(--ink);
}

.page-about .about-partner-tag {
  display: inline-block;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius);
  border: 1px solid var(--steel);
  background: var(--indigo);
  font-size: var(--fs-12);
  letter-spacing: 0.03em;
  color: var(--cream);
}

.page-about .about-partner-tag:nth-child(1) {
  border-color: rgba(61, 242, 208, 0.55);
  color: var(--cyan);
}

.page-about .about-partner-tag:nth-child(2) {
  border-color: rgba(255, 138, 61, 0.55);
  color: var(--orange);
}

.page-about .about-partner-tag:nth-child(3) {
  border-color: rgba(232, 195, 122, 0.55);
  color: var(--sand);
}

.page-about .about-partner-tag:nth-child(4) {
  border-color: rgba(155, 140, 255, 0.55);
  color: var(--violet);
}

.page-about .about-partner-notes p {
  margin: 0 0 0.85rem;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--slate);
  max-width: 66ch;
}

/* 服务信息 */
.page-about .about-service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-service-text {
  margin: 0.85rem 0 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--cream);
  opacity: 0.88;
  max-width: 66ch;
}

.page-about .about-service-facts {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  border: var(--border);
  background: var(--indigo);
}

.page-about .about-service-facts li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.2rem;
  padding: 0.7rem 0.95rem;
  border-bottom: 1px solid var(--steel);
}

.page-about .about-service-facts li:last-child {
  border-bottom: 0;
}

.page-about .about-fact-label {
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .about-fact-value {
  font-size: var(--fs-14);
  line-height: 1.65;
  color: var(--cream);
  word-break: break-word;
}

.page-about .about-service-side {
  border: var(--border);
  border-top: 4px solid var(--cyan);
  background: var(--ink);
  padding: 1.1rem 1rem 1.2rem;
}

.page-about .about-service-side h3 {
  margin: 0 0 0.75rem;
  font-size: var(--fs-18);
  font-weight: 700;
}

.page-about .about-service-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .about-service-links a {
  display: block;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--steel);
  border-radius: var(--radius);
  font-size: var(--fs-14);
  color: var(--cream);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-service-links a:hover,
.page-about .about-service-links a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(61, 242, 208, 0.07);
}

/* 焦点可见性 */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--sand);
  outline-offset: 2px;
}

/* 中等宽度 */
@media (min-width: 680px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stat {
    padding: 1.1rem 1rem;
  }

  .page-about .about-problem-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-service-facts li {
    grid-template-columns: 9.5rem 1fr;
    align-items: baseline;
    gap: 0.75rem;
  }
}

/* 桌面 */
@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(2rem, 4vw, 3.25rem);
  }

  .page-about .about-declaration-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(1.5rem, 3.5vw, 3rem);
  }

  .page-about .about-quote {
    margin-top: 1.9rem;
  }

  .page-about .about-freshness-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(1.5rem, 3.5vw, 3rem);
    align-items: start;
  }

  .page-about .about-refresh-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: clamp(1.5rem, 3.5vw, 2.75rem);
  }

  .page-about .about-team-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-content: start;
  }

  .page-about .about-role--main {
    grid-row: span 2;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
  }

  .page-about .about-team-disclosures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-stages-wrap {
    padding: 1.4rem 1.6rem 1.5rem;
  }

  .page-about .about-timeline {
    padding-left: 1.6rem;
  }

  .page-about .about-timeline-item::before {
    left: -1.6rem;
  }

  .page-about .about-partners-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(1.5rem, 3.5vw, 3rem);
  }

  .page-about .about-partner-band {
    align-content: start;
  }

  .page-about .about-service-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(1.5rem, 3.5vw, 2.75rem);
  }

  .page-about .about-service-side {
    margin-top: 0.4rem;
  }
}

/* 动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-problem-card,
  .page-about .about-toc-list a,
  .page-about .about-service-links a {
    transition: none;
  }

  .page-about .about-problem-card:hover {
    transform: none;
  }
}