.page-about {
  --about-gap: 22px;
  --about-hair: 1px solid var(--line);
  --about-hair-strong: 1px solid var(--line-strong);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 26px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 10px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: start;
}

.page-about .about-hero__index {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--grey);
  text-transform: uppercase;
  margin: 0;
}

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

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8vw, 58px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(242, 245, 243, 0.78);
  max-width: 60ch;
}

.page-about .about-hero__points {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  font-size: 15px;
  color: rgba(242, 245, 243, 0.72);
}

.page-about .about-hero__points li {
  position: relative;
  padding-left: 20px;
}

.page-about .about-hero__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 2px;
  border-radius: 1px;
  background: var(--cyan);
}

.page-about .about-hero__points .num {
  color: var(--amber);
  font-weight: 600;
}

.page-about .about-hero__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__board {
  position: relative;
  border: var(--about-hair-strong);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(18, 51, 40, 0.94), rgba(8, 25, 20, 0.94));
  padding: 22px 20px 20px;
  overflow: hidden;
}

.page-about .about-hero__board::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(154, 166, 162, 0.08) 0 1px,
    transparent 1px 22px
  );
  pointer-events: none;
}

.page-about .about-hero__board-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
  text-transform: uppercase;
}

.page-about .about-hero__stats {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(154, 166, 162, 0.22);
}

.page-about .about-hero__stat:last-child {
  border-bottom: 0;
}

.page-about .about-hero__stat dt {
  font-size: 14px;
  color: var(--grey);
}

.page-about .about-hero__stat dd {
  margin: 0;
  font-size: 15px;
  color: var(--paper);
}

.page-about .about-hero__stat dd .num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
  font-size: 19px;
  margin-right: 2px;
}

/* ---------- 章号目录条 ---------- */
.page-about .about-index {
  position: sticky;
  top: 0;
  z-index: 6;
  margin-top: 30px;
  border-top: var(--about-hair);
  border-bottom: var(--about-hair);
  background: rgba(11, 35, 28, 0.94);
  backdrop-filter: blur(6px);
}

.page-about .about-index ol {
  margin: 0;
  padding: 10px 0;
  list-style: none;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .about-index ol::-webkit-scrollbar {
  display: none;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: 13.5px;
  color: rgba(242, 245, 243, 0.8);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 160ms ease, color 160ms ease, background-color 160ms ease;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(47, 224, 200, 0.08);
}

.page-about .about-index .num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--amber);
  letter-spacing: 0.04em;
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 22px;
}

.page-about .about-origin__body p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(242, 245, 243, 0.8);
}

.page-about .about-origin__body p:first-child::first-letter {
  font-family: var(--font-display);
  font-size: 2.4em;
  line-height: 1;
  font-weight: 800;
  color: var(--amber);
  float: left;
  margin: 4px 10px 0 0;
}

.page-about .about-origin__card {
  padding: 20px;
}

.page-about .about-origin__thread {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-origin__thread li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 9px;
  border-bottom: 1px dashed rgba(11, 35, 28, 0.18);
  font-size: 14.5px;
  color: var(--ink);
}

.page-about .about-origin__thread li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-origin__thread .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan-2);
  font-weight: 700;
}

/* ---------- 战术板插图 ---------- */
.page-about .about-break {
  padding-top: 4px;
}

.page-about .about-break__figure {
  margin: 0;
}

.page-about .about-break__figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: calc(var(--radius) - 3px);
}

/* ---------- 02 时间轴 ---------- */
.page-about .tl {
  margin-top: 22px;
  border-top: var(--about-hair);
}

.page-about .tl__node {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 24px 0;
  border-bottom: var(--about-hair);
}

.page-about .tl__stamp {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
  line-height: 1;
}

.page-about .tl__phase {
  font-size: 11.5px;
  letter-spacing: 0.08em;
}

.page-about .tl__head {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .tl__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(242, 245, 243, 0.74);
  max-width: 68ch;
}

.page-about .tl__main .accordion {
  margin-top: 12px;
  border-top: 1px dashed rgba(154, 166, 162, 0.28);
}

.page-about .tl__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 12px 0;
  background: transparent;
  border: 0;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--cyan);
  text-align: left;
}

.page-about .tl__trigger[aria-expanded="true"] {
  color: var(--amber);
}

.page-about .tl__caret {
  position: relative;
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
}

.page-about .tl__caret::before,
.page-about .tl__caret::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 11px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transform: translate(-50%, -50%);
  transition: transform 200ms ease;
}

.page-about .tl__caret::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-about .tl__trigger[aria-expanded="true"] .tl__caret::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-about .tl__list {
  margin: 0 0 6px;
  padding: 0 0 0 2px;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .tl__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(242, 245, 243, 0.74);
}

.page-about .tl__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 8px;
  height: 2px;
  border-radius: 1px;
  background: var(--cyan-2);
}

/* ---------- 03 赛区 ---------- */
.page-about .about-zones__lede {
  margin: 14px 0 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: rgba(242, 245, 243, 0.78);
  max-width: 62ch;
}

.page-about .zones {
  margin-top: 22px;
}

.page-about .zones__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 12px 16px;
  border: var(--about-hair);
  border-radius: var(--radius);
  background: rgba(18, 51, 40, 0.5);
  font-size: 13px;
  color: var(--grey);
}

.page-about .zones__key {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .zones__dot {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  display: inline-block;
}

.page-about .zones__dot--core {
  background: var(--amber);
}

.page-about .zones__dot--active {
  background: var(--cyan);
}

.page-about .zones__dot--follow {
  background: var(--grey);
}

.page-about .zones__grid {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .zone {
  position: relative;
  padding: 18px 18px 16px;
  border: var(--about-hair);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(18, 51, 40, 0.72), rgba(8, 25, 20, 0.72));
  transition: border-color 180ms ease, transform 180ms ease;
}

.page-about .zone--core {
  border-color: rgba(255, 176, 32, 0.46);
}

.page-about .zone:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .zone__code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--amber);
  border-radius: 4px;
  padding: 3px 7px;
  line-height: 1;
}

.page-about .zone__title {
  margin: 14px 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .zone__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(242, 245, 243, 0.74);
}

.page-about .zone__foot {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(154, 166, 162, 0.28);
  font-size: 13px;
  color: var(--cyan);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-about .zone__foot .num {
  color: var(--amber);
  font-weight: 700;
  font-size: 15px;
}

.page-about .zones__tail {
  margin: 20px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--cyan-2);
  background: rgba(18, 137, 124, 0.12);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(242, 245, 243, 0.78);
}

.page-about .zones__tail .num {
  color: var(--amber);
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about .zones__tail a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  margin-top: 22px;
}

.page-about .about-team__figure {
  margin: 0 0 24px;
}

.page-about .about-team__figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: calc(var(--radius) - 3px);
}

.page-about .about-team__roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-role {
  padding: 20px;
}

.page-about .about-role .card__title {
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 21px;
  margin: 10px 0 8px;
}

.page-about .about-role .card__text {
  color: rgba(11, 35, 28, 0.78);
  font-size: 14.5px;
  line-height: 1.72;
}

.page-about .about-team__shift {
  margin-top: 26px;
  padding-top: 22px;
  border-top: var(--about-hair);
}

.page-about .about-team__shift-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .about-shift {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-shift__item {
  padding: 14px 16px;
  border: var(--about-hair);
  border-left: 3px solid var(--amber);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(18, 51, 40, 0.42);
}

.page-about .about-shift__slot {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-about .about-shift__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(242, 245, 243, 0.76);
}

/* ---------- 05 流程 ---------- */
.page-about .flow {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .flow__step {
  position: relative;
  padding: 20px 18px 18px;
  border: var(--about-hair);
  border-radius: var(--radius);
  background: rgba(18, 51, 40, 0.42);
  transition: border-color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.page-about .flow__step:hover {
  border-color: var(--amber);
  background: rgba(255, 176, 32, 0.07);
  transform: translateY(-2px);
}

.page-about .flow__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .flow__step:hover .flow__no {
  color: var(--amber);
}

.page-about .flow__head {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(242, 245, 243, 0.74);
}

.page-about .about-verify__note {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(242, 245, 243, 0.72);
}

.page-about .about-verify__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 06 规模 ---------- */
.page-about .about-overview {
  padding-top: 8px;
}

.page-about .about-overview__figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: var(--about-hair-strong);
}

.page-about .about-overview__figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.66);
}

.page-about .about-overview__grid {
  margin-top: -46px;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 0 2px;
}

.page-about .about-overview__cell {
  padding: 16px 14px;
  border: var(--about-hair-strong);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(8, 25, 20, 0.95), rgba(18, 51, 40, 0.92));
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-overview__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 30px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-overview__unit {
  font-size: 13.5px;
  color: var(--grey);
}

.page-about .about-overview__label {
  flex: 1 0 100%;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(242, 245, 243, 0.72);
}

.page-about .about-overview__cta {
  margin: 24px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(242, 245, 243, 0.76);
  max-width: 66ch;
}

.page-about .about-overview__cta a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-overview__cta a:hover {
  color: var(--amber-2);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .zones__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-team__roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-shift {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
  }

  .page-about .tl__node {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 32px;
  }

  .page-about .tl__stamp {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .tl__year {
    font-size: 38px;
  }

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

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

  .page-about .about-overview__value {
    font-size: 34px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__title {
    font-size: 56px;
  }

  .page-about .about-overview__grid {
    margin-top: -60px;
    gap: 14px;
  }

  .page-about .about-overview__cell {
    padding: 20px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .zone,
  .page-about .flow__step,
  .page-about .about-index a,
  .page-about .tl__caret::after {
    transition: none;
  }

  .page-about .zone:hover,
  .page-about .flow__step:hover {
    transform: none;
  }
}