.page-about {
  --about-muted: #B7C7DC;
  --about-rail: 96px;
  font-family: var(--sans);
  color: var(--white);
  background: var(--ink);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--grey);
}

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

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

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 48px);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .eyebrow {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about h1 {
  margin: 0;
  font-size: clamp(28px, 6.2vw, 52px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.page-about .hero-lead {
  margin: clamp(16px, 2.5vw, 22px) 0 0;
  max-width: 40em;
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .stat-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
  padding: 16px;
  border: var(--edge);
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

.page-about .stat-card:nth-child(2n) {
  background: var(--panel-2);
}

.page-about .stat-num {
  font-family: var(--mono);
  font-size: clamp(24px, 5vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  word-break: break-word;
}

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

.page-about .stat-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--grey);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: 14px;
  margin-top: clamp(40px, 7vw, 88px);
}

.page-about .chapter-rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .chapter-num {
  display: inline-block;
  padding: 2px 8px;
  border: 2px solid var(--cyan);
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .chapter-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--grey);
}

.page-about .chapter-body {
  min-width: 0;
  padding: clamp(20px, 3.6vw, 40px);
  border: var(--edge);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .chapter-title {
  margin: 0;
  font-size: clamp(21px, 3.6vw, 30px);
  line-height: 1.32;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .chapter-text {
  margin: 14px 0 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .chapter-link {
  margin: clamp(20px, 3vw, 28px) 0 0;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--steel) 62%, rgba(45, 74, 102, 0.1));
}

.page-about .timeline > li {
  position: relative;
  padding-bottom: clamp(18px, 3vw, 26px);
}

.page-about .timeline > li:last-child {
  padding-bottom: 0;
}

.page-about .timeline > li::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 4px;
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transition: background-color 160ms ease, border-color 160ms ease;
}

.page-about .timeline > li:hover::before,
.page-about .timeline > li:focus-within::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .t-year {
  margin: 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .t-title {
  margin: 6px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .t-text {
  margin: 6px 0 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--grey);
}

/* ---------- 团队分工 ---------- */
.page-about .role-grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

.page-about .role-card {
  padding: 18px;
  border: 2px solid var(--steel);
  background: var(--panel-2);
  transition: transform 160ms ease, border-color 160ms ease;
}

.page-about .role-card:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
}

.page-about .role-count {
  display: block;
  font-family: var(--mono);
  font-size: clamp(30px, 6vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .role-name {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 700;
}

.page-about .role-text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--grey);
}

/* ---------- 媒体框 ---------- */
.page-about .media-frame {
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: 0;
  border: var(--edge);
  background: var(--panel-2);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

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

.page-about .media-caption {
  padding: 10px 14px;
  border-top: var(--edge);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- 校验流程 ---------- */
.page-about .process {
  display: grid;
  gap: 12px;
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .step {
  position: relative;
  padding: 18px 18px 18px 18px;
  border: 2px solid var(--steel);
  border-left: 6px solid var(--cyan);
  background: var(--panel-2);
}

.page-about .step:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .step-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

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

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

.page-about .step-text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--grey);
}

/* ---------- 版本资料库 ---------- */
.page-about .version-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: clamp(22px, 3.5vw, 30px);
}

.page-about .ver-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 14px;
  border: 2px solid var(--steel);
  background: var(--panel-2);
}

.page-about .ver-chip--now {
  border-color: var(--orange);
  background: rgba(255, 106, 42, 0.1);
}

.page-about .ver-id {
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .ver-chip--now .ver-id {
  color: var(--orange);
}

.page-about .version-note {
  margin: 16px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-muted);
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

.page-about .coverage-item {
  padding: 16px;
  border: var(--edge);
  background: var(--ink);
  box-shadow: var(--shadow-soft);
}

.page-about .coverage-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(24px, 5vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .coverage-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--grey);
}

.page-about .coverage-list {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 2px dashed var(--steel);
}

.page-about .coverage-list li {
  position: relative;
  padding: 12px 0 12px 22px;
  border-bottom: 2px dashed rgba(45, 74, 102, 0.55);
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-muted);
}

.page-about .coverage-list li::before {
  content: "▚";
  position: absolute;
  left: 0;
  top: 12px;
  color: var(--cyan);
  font-size: 13px;
}

/* ---------- 玩家服务 ---------- */
.page-about .service-grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

.page-about .service-card {
  padding: 18px;
  border: 2px solid var(--steel);
  background: var(--panel-2);
}

.page-about .service-title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .service-text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--grey);
  word-break: break-word;
}

.page-about .service-mail {
  color: var(--white);
}

.page-about .about-cta {
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(18px, 3vw, 26px);
  border: 2px solid var(--cyan);
  background: linear-gradient(135deg, rgba(56, 232, 224, 0.14), rgba(255, 106, 42, 0.08));
}

.page-about .cta-title {
  margin: 0;
  font-size: clamp(17px, 2.6vw, 20px);
  font-weight: 700;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

/* ---------- 入场动效 ---------- */
.page-about [data-reveal] {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .page-about [data-reveal][data-visible="true"] {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 720px) {
  .page-about .role-grid,
  .page-about .process,
  .page-about .service-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .version-grid,
  .page-about .coverage-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

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

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 36px);
    align-items: start;
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 96px;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .page-about .chapter-num {
    font-size: 18px;
  }

  .page-about .chapter-label {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
  }

  .page-about .chapter-text,
  .page-about .version-note {
    font-size: 17px;
  }
}

@media (min-width: 1180px) {
  .page-about .coverage-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    grid-template-areas:
      "title grid"
      "text grid"
      "list list";
    column-gap: clamp(24px, 3vw, 40px);
    align-items: start;
  }

  .page-about .coverage-body .chapter-title {
    grid-area: title;
  }

  .page-about .coverage-body .chapter-text {
    grid-area: text;
  }

  .page-about .coverage-body .coverage-grid {
    grid-area: grid;
    margin-top: 0;
  }

  .page-about .coverage-body .coverage-list {
    grid-area: list;
  }
}