.page-about {
  --about-gap: clamp(28px, 4vw, 56px);
  --about-radius: 0;
  padding-bottom: clamp(48px, 8vw, 104px);
}

.page-about a:focus-visible,
.page-about [tabindex="0"]:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: clamp(16px, 3vw, 28px);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.page-about .breadcrumb__item {
  color: var(--c-stone);
  text-decoration: none;
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 10px;
  color: var(--c-line-strong);
}
.page-about .breadcrumb__item--current {
  color: var(--c-cream);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(20px, 4vw, 40px);
  padding: clamp(30px, 4.4vw, 58px) clamp(20px, 3.4vw, 52px) clamp(28px, 4vw, 48px);
  border: var(--border-w) solid var(--c-line-strong);
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(78, 168, 255, 0.09), transparent 58%),
    linear-gradient(158deg, var(--c-lift) 0%, var(--c-carbon) 68%);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 16px;
  background-image: repeating-linear-gradient(90deg, rgba(158, 155, 146, 0.34) 0 1px, transparent 1px 26px);
  background-repeat: repeat-x;
  background-position: left top;
  background-size: auto 9px;
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 16px;
  left: 0;
  width: 96px;
  height: 4px;
  background: var(--c-orange);
}
.page-about .about-hero__kicker {
  padding-top: 10px;
}
.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-size: clamp(32px, 5.2vw, 72px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-cream);
}
.page-about .about-hero__lede {
  max-width: 64ch;
  margin-top: clamp(16px, 2.4vw, 26px);
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.8;
  color: rgba(239, 233, 220, 0.82);
}
.page-about .about-hero__lede strong {
  color: var(--c-orange);
  font-weight: 700;
}
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 22px;
  margin-top: clamp(24px, 3.6vw, 40px);
  padding-top: clamp(18px, 2.6vw, 28px);
  border-top: 1px solid var(--c-line-strong);
}
.page-about .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--c-cream);
}
.page-about .stat__label {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-stone);
}

/* ---------- 主体：索引 + 正文 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 40px);
  margin-top: clamp(40px, 6vw, 84px);
}
.page-about .about-index {
  align-self: start;
}
.page-about .about-index__label {
  padding-bottom: 10px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--c-line-strong);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-stone);
}
.page-about .index-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
}
.page-about .index-list__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 8px 8px 8px 10px;
  border-left: 2px solid var(--c-line-strong);
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-stone);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}
.page-about .index-list__link:hover {
  color: var(--c-cream);
  border-left-color: var(--c-moss);
  background: rgba(23, 54, 45, 0.55);
}
.page-about .index-list__link[aria-current="true"] {
  color: var(--c-orange);
  border-left-color: var(--c-orange);
  background: rgba(255, 106, 26, 0.07);
}
.page-about .index-list__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-moss);
}
.page-about .index-list__link[aria-current="true"] .index-list__num {
  color: var(--c-orange-soft);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(26px, 3.6vw, 48px);
  border-top: var(--border-w) solid var(--c-line-strong);
}
.page-about .about-section--first {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-sec__head {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}
.page-about .about-sec__kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-moss);
}
.page-about .about-sec__kicker::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--c-line);
}
.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--c-clay);
}
.page-about .about-sec__title {
  margin: 10px 0 0;
  font-size: clamp(22px, 3.1vw, 38px);
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--c-cream);
}
.page-about .about-sec__body {
  max-width: 72ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(239, 233, 220, 0.82);
}
.page-about .about-sec__body + .about-sec__body {
  margin-top: 16px;
}
.page-about .about-sec__body--tight {
  margin-top: clamp(18px, 2.4vw, 26px);
  padding-left: 16px;
  border-left: 2px solid var(--c-clay);
  color: rgba(239, 233, 220, 0.76);
}
.page-about .about-sec__body p + p {
  margin-top: 14px;
}

/* ---------- 刻度分隔线 ---------- */
.page-about .tick-rule {
  position: relative;
  height: 22px;
  margin: clamp(12px, 2vw, 22px) 0 clamp(6px, 1vw, 10px);
  border-bottom: 1px solid var(--c-line-strong);
}
.page-about .tick-rule::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  background-image: repeating-linear-gradient(90deg, var(--c-line-strong) 0 1px, transparent 1px 24px);
  opacity: 0.85;
}
.page-about .tick-rule::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 46px;
  height: 5px;
  background: var(--c-moss);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin-top: clamp(22px, 3vw, 34px);
  aspect-ratio: auto;
  border: var(--border-w) solid var(--c-line-strong);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure .media-frame__caption {
  display: block;
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-stone);
  background: rgba(16, 36, 31, 0.92);
  border-top: 1px solid var(--c-line);
}
.page-about .about-figure--banner {
  margin-top: clamp(20px, 2.8vw, 30px);
}

/* ---------- 三类来源 ---------- */
.page-about .about-sources {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 2.8vw, 30px);
}
.page-about .about-source {
  padding: 18px 16px 20px;
  border: var(--border-w) solid var(--c-line-strong);
  border-left-width: 5px;
  background: var(--c-panel);
  box-shadow: var(--shadow-soft);
}
.page-about .about-source--moss { border-left-color: var(--c-moss); }
.page-about .about-source--blue { border-left-color: var(--c-blue); }
.page-about .about-source--clay { border-left-color: var(--c-clay); }
.page-about .about-source__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-stone);
}
.page-about .about-source--moss .about-source__tag { color: var(--c-moss); }
.page-about .about-source--blue .about-source__tag { color: var(--c-blue); }
.page-about .about-source--clay .about-source__tag { color: var(--c-clay); }
.page-about .about-source__title {
  margin: 8px 0 0;
  font-size: 17px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--c-cream);
}
.page-about .about-source p:last-child {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(239, 233, 220, 0.76);
}

/* ---------- 对照表 ---------- */
.page-about .about-table__wrap {
  margin-top: clamp(18px, 2.4vw, 26px);
  border: var(--border-w) solid var(--c-line-strong);
  background: var(--c-panel);
  overflow-x: auto;
}
.page-about .about-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14px;
}
.page-about .about-table__caption {
  caption-side: top;
  padding: 14px 16px 10px;
  text-align: left;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-stone);
  background: var(--c-lift);
}
.page-about .about-table th,
.page-about .about-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-table thead th {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--c-stone);
  white-space: nowrap;
  background: rgba(23, 54, 45, 0.6);
  border-bottom-color: var(--c-line-strong);
}
.page-about .about-table tbody th {
  font-weight: 700;
  color: var(--c-cream);
  white-space: nowrap;
}
.page-about .about-table tbody td {
  color: rgba(239, 233, 220, 0.78);
  line-height: 1.7;
}
.page-about .about-table tbody tr:hover {
  background: rgba(23, 54, 45, 0.5);
}
.page-about .about-table .tag {
  display: inline-block;
  padding: 3px 8px;
  font-size: 11px;
  letter-spacing: 0.08em;
  white-space: nowrap;
  border: 1px solid currentColor;
}
.page-about .about-note {
  margin-top: clamp(16px, 2.2vw, 22px);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(239, 233, 220, 0.72);
}

/* ---------- 维护分工 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(18px, 2.4vw, 26px);
}
.page-about .about-role {
  padding: 18px 16px;
  border: 1px solid var(--c-line-strong);
  background: rgba(16, 36, 31, 0.72);
}
.page-about .about-role__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-moss);
}
.page-about .about-role__title {
  margin: 8px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-cream);
}
.page-about .about-role p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(239, 233, 220, 0.76);
}

/* ---------- 赛季四阶段（纵向刻度轴） ---------- */
.page-about .about-phases {
  position: relative;
  margin-top: clamp(22px, 3vw, 32px);
  padding-left: 26px;
}
.page-about .about-phases::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-moss), var(--c-line-strong));
}
.page-about .about-phase {
  position: relative;
  padding-bottom: 22px;
}
.page-about .about-phase:last-child {
  padding-bottom: 0;
}
.page-about .about-phase::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-clay);
  border: 2px solid var(--c-carbon);
}
.page-about .about-phase__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-stone);
}
.page-about .about-phase__title {
  margin: 6px 0 0;
  font-size: 18px;
  font-weight: 800;
  color: var(--c-cream);
}
.page-about .about-phase p {
  margin-top: 8px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(239, 233, 220, 0.78);
}

/* ---------- 联系方式 ---------- */
.page-about .about-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(18px, 2.4vw, 26px);
  border: var(--border-w) solid var(--c-line-strong);
  background: var(--c-line-strong);
}
.page-about .about-contact__item {
  padding: 14px 16px;
  background: var(--c-panel);
}
.page-about .about-contact__label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-stone);
}
.page-about .about-contact__value {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  word-break: break-word;
  color: var(--c-cream);
}

/* ---------- 按钮组 ---------- */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.8vw, 30px);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: clamp(22px, 3vw, 32px);
  padding-left: 28px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--c-line-strong);
}
.page-about .about-timeline__item {
  position: relative;
  padding: 2px 0 22px;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-clay);
  border: 2px solid var(--c-carbon);
  transition: transform 0.2s ease, background-color 0.2s ease;
}
.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-visible::before {
  transform: scale(1.35);
  background: var(--c-orange-soft);
}
.page-about .about-timeline__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-moss);
}
.page-about .about-timeline__title {
  margin: 6px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-cream);
}
.page-about .about-timeline__hint {
  margin-top: 8px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(239, 233, 220, 0.76);
}

/* ---------- 结尾 ---------- */
.page-about .about-coda {
  margin-top: clamp(38px, 5.4vw, 76px);
  padding: clamp(24px, 3.4vw, 44px);
  border: var(--border-w) solid var(--c-line-strong);
  background:
    linear-gradient(140deg, var(--c-lift) 0%, var(--c-panel) 70%),
    var(--c-panel);
  box-shadow: var(--shadow-hard);
}
.page-about .about-coda__title {
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.25;
  font-weight: 900;
  color: var(--c-cream);
}
.page-about .about-coda__text {
  max-width: 68ch;
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(239, 233, 220, 0.78);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-sources {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(172px, 208px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }
  .page-about .about-index {
    position: sticky;
    top: 96px;
    align-self: start;
  }
  .page-about .about-phases {
    padding-left: 34px;
  }
  .page-about .about-phases::before {
    left: 7px;
  }
  .page-about .about-phase::before {
    left: -33px;
  }
}

@media (min-width: 1360px) {
  .page-about .about-hero__title {
    max-width: 16ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .index-list__link,
  .page-about .about-timeline__item::before {
    transition: none;
  }
}