/* ===== page-about 作用域 ===== */
.page-about {
  --about-rail-w: 64px;
  --about-hair: 1px solid var(--grid-line);
  position: relative;
  color: var(--text-bright);
  font-family: var(--f-body);
  line-height: 1.7;
  overflow-x: hidden;
  background: var(--ink-deep);
}

.page-about .mono {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.03em;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.012em;
  color: var(--text-bright);
}

.page-about p {
  margin: 0;
  color: var(--text-muted);
}

/* -------- 章节公共头 -------- */
.page-about .sec-head {
  display: grid;
  gap: calc(var(--step) * 1.5);
  padding-bottom: calc(var(--step) * 3);
  border-bottom: var(--about-hair);
  margin-bottom: calc(var(--step) * 4);
}

.page-about .band-index {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--step) * 1.5);
  font-size: 12px;
  color: var(--text-dim);
}

.page-about .band-index__num {
  color: var(--volt);
  font-size: 12px;
  letter-spacing: 0.16em;
}

.page-about .band-index__bar {
  display: block;
  width: 56px;
  height: 1px;
  background: var(--volt);
}

.page-about .h-section {
  font-size: clamp(1.75rem, 1.2rem + 2.4vw, 3rem);
  letter-spacing: -0.02em;
}

.page-about .sec-head__lede {
  max-width: 56ch;
  font-size: clamp(0.98rem, 0.92rem + 0.3vw, 1.08rem);
  color: var(--text-muted);
}

/* -------- 右缘竖排索引 -------- */
.page-about .about-rail {
  display: none;
}

/* -------- 首屏 -------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--step) * 5) 0 calc(var(--step) * 8);
  background:
    radial-gradient(120% 88% at 84% 0%, rgba(124, 224, 255, 0.12), transparent 58%),
    linear-gradient(180deg, var(--night-blue) 0%, var(--ink-deep) 76%);
  border-bottom: var(--about-hair);
}

.page-about .about-hero__inner {
  display: grid;
  gap: calc(var(--step) * 4);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: calc(var(--step) * 0.75);
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

.page-about .crumbs a {
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

.page-about .crumbs__sep {
  color: var(--text-dim);
}

.page-about .about-hero__grid {
  display: grid;
  gap: calc(var(--step) * 5);
}

.page-about .about-hero__copy {
  display: grid;
  gap: calc(var(--step) * 2);
  align-content: start;
}

.page-about .label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: max-content;
  padding: 5px 11px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  border: var(--about-hair);
  color: var(--volt);
  background: rgba(200, 255, 61, 0.06);
}

.page-about .label--volt {
  border-color: rgba(200, 255, 61, 0.45);
}

.page-about .label--amber {
  color: var(--amber);
  border-color: rgba(242, 160, 61, 0.45);
  background: rgba(242, 160, 61, 0.07);
}

.page-about .label__dot {
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.page-about .about-hero h1 {
  max-width: 16em;
  font-size: clamp(2.4rem, 1.4rem + 5.2vw, 5.2rem);
  letter-spacing: -0.03em;
  line-height: 1.02;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  font-size: clamp(1rem, 0.94rem + 0.36vw, 1.15rem);
  line-height: 1.78;
  color: var(--text-muted);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  border: var(--about-hair);
  background: var(--grid-line);
}

.page-about .fact {
  display: grid;
  gap: 6px;
  padding: calc(var(--step) * 2) calc(var(--step) * 1.75);
  background: var(--ink-deep);
  min-width: 0;
}

.page-about .fact__cap {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.page-about .fact__num {
  margin: 0;
  font-size: clamp(1.5rem, 1.05rem + 1.5vw, 2.15rem);
  font-weight: 600;
  color: var(--volt);
  line-height: 1;
}

.page-about .about-hero__art {
  position: relative;
  border: var(--about-hair);
  background: var(--night-blue);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.page-about .about-hero__art::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(124, 224, 255, 0.08), transparent 55%);
  pointer-events: none;
}

.page-about .about-hero__svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* -------- 01 时间线 -------- */
.page-about .about-timeline {
  padding: calc(var(--step) * 9) 0 calc(var(--step) * 8);
  background: var(--ink-deep);
  border-bottom: var(--about-hair);
}

.page-about .about-timeline__media {
  margin: 0 0 calc(var(--step) * 5);
}

.page-about .media {
  position: relative;
  margin: 0;
  border: var(--about-hair);
  background: var(--night-blue);
  overflow: hidden;
}

.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .media--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .media--tall img {
  aspect-ratio: 3 / 4;
}

.page-about .media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(150deg, rgba(124, 224, 255, 0.10), transparent 52%);
  pointer-events: none;
}

.page-about .media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 7px 12px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--text-bright);
  background: rgba(6, 17, 12, 0.88);
  border-top: var(--about-hair);
  border-right: var(--about-hair);
}

.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-hair);
}

.page-about .about-tl__item {
  display: grid;
  gap: 8px;
  padding: calc(var(--step) * 3) 0 calc(var(--step) * 3) calc(var(--step) * 3);
  border-left: 2px solid var(--grid-line);
  border-bottom: var(--about-hair);
  transition: border-color var(--t-base) var(--ease), padding-left var(--t-base) var(--ease);
}

.page-about .about-tl__item:hover {
  border-left-color: var(--volt);
  padding-left: calc(var(--step) * 4);
}

.page-about .about-tl__item--key {
  border-left-color: var(--volt);
  background: linear-gradient(90deg, rgba(200, 255, 61, 0.05), transparent 42%);
}

.page-about .about-tl__year {
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--volt);
  font-weight: 600;
}

.page-about .about-tl__title {
  font-size: clamp(1.05rem, 0.98rem + 0.4vw, 1.32rem);
  letter-spacing: -0.005em;
}

.page-about .about-tl__text {
  max-width: 62ch;
  font-size: 0.96rem;
  color: var(--text-muted);
}

/* -------- 02 团队 -------- */
.page-about .about-team {
  padding: calc(var(--step) * 9) 0 calc(var(--step) * 8);
  background: var(--night-blue);
  border-bottom: var(--about-hair);
}

.page-about .about-team__grid {
  display: grid;
  gap: calc(var(--step) * 5);
}

.page-about .about-team__chart {
  border: var(--about-hair);
  background: var(--ink-deep);
  padding: calc(var(--step) * 2);
}

.page-about .team-chart {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-team__roles {
  display: grid;
  gap: 0;
  border-top: var(--about-hair);
}

.page-about .role {
  display: grid;
  gap: 8px;
  padding: calc(var(--step) * 2.5) 0;
  border-bottom: var(--about-hair);
}

.page-about .role__n {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--volt);
}

.page-about .role__title {
  font-size: 1.1rem;
  letter-spacing: -0.005em;
}

.page-about .role__text {
  max-width: 60ch;
  font-size: 0.94rem;
  color: var(--text-muted);
}

/* -------- 03 核验流程 -------- */
.page-about .about-flow {
  padding: calc(var(--step) * 9) 0 calc(var(--step) * 8);
  background: var(--ink-deep);
  border-bottom: var(--about-hair);
}

.page-about .about-flow__layout {
  display: grid;
  gap: calc(var(--step) * 5);
}

.page-about .flow-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: calc(var(--step) * 2);
}

.page-about .flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: calc(var(--step) * 2);
  padding: calc(var(--step) * 2) calc(var(--step) * 2) calc(var(--step) * 2) calc(var(--step) * 2);
  background: var(--turf);
  border: var(--about-hair);
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

.page-about .flow-step:hover {
  transform: translateY(-2px);
  border-color: var(--volt);
}

.page-about .flow-step__n {
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: start;
  min-height: 34px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-bright);
  background: var(--ink-deep);
  border: var(--about-hair);
}

.page-about .flow-step__title {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.page-about .flow-step__body p {
  font-size: 0.94rem;
  max-width: 58ch;
}

.page-about .flow-step--done {
  background: rgba(76, 107, 90, 0.16);
}

.page-about .flow-step--done .flow-step__n {
  color: var(--text-dim);
  border-color: var(--text-dim);
}

.page-about .flow-step--done .flow-step__title {
  color: var(--text-muted);
}

.page-about .flow-step--active {
  border-color: var(--volt);
  background: linear-gradient(90deg, rgba(200, 255, 61, 0.09), var(--turf) 62%);
}

.page-about .flow-step--active .flow-step__n {
  background: var(--volt);
  color: var(--ink-deep);
  border-color: var(--volt);
}

.page-about .flow-step--active .flow-step__title {
  color: var(--volt);
}

.page-about .about-flow__media {
  align-self: start;
}

/* -------- 04 赛区标签 -------- */
.page-about .about-zones {
  padding: calc(var(--step) * 9) 0 calc(var(--step) * 8);
  background:
    linear-gradient(180deg, var(--night-blue) 0%, var(--ink-deep) 100%);
  border-bottom: var(--about-hair);
}

.page-about .about-zones__grid {
  display: grid;
  gap: calc(var(--step) * 5);
}

.page-about .about-zones__lede {
  max-width: 62ch;
  padding-bottom: calc(var(--step) * 3);
  border-bottom: var(--about-hair);
  font-size: 1rem;
  color: var(--text-muted);
}

.page-about .zone-list {
  margin: calc(var(--step) * 3) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: calc(var(--step) * 2.5);
}

.page-about .zone-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: calc(var(--step) * 2);
  align-items: start;
}

.page-about .zone-item__code {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-deep);
  background: var(--volt);
  letter-spacing: 0.06em;
}

.page-about .zone-item:last-child .zone-item__code {
  background: var(--screen);
}

.page-about .zone-item__title {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.page-about .zone-item p {
  font-size: 0.94rem;
  max-width: 58ch;
}

/* -------- 05 更新节奏 -------- */
.page-about .about-rhythm {
  padding: calc(var(--step) * 9) 0 calc(var(--step) * 8);
  background: var(--ink-deep);
  border-bottom: var(--about-hair);
}

.page-about .rhythm-grid {
  display: grid;
  gap: 1px;
  background: var(--grid-line);
  border: var(--about-hair);
}

.page-about .rhythm-card {
  display: grid;
  gap: calc(var(--step) * 1.5);
  align-content: start;
  padding: calc(var(--step) * 3);
  background: var(--night-blue);
}

.page-about .rhythm-card--match {
  background: linear-gradient(180deg, rgba(242, 160, 61, 0.09), var(--night-blue) 62%);
  border-left: 3px solid var(--amber);
}

.page-about .rhythm-card__title {
  font-size: clamp(1.15rem, 1.02rem + 0.6vw, 1.5rem);
  letter-spacing: -0.01em;
}

.page-about .rhythm-card__text {
  font-size: 0.95rem;
  max-width: 52ch;
}

.page-about .rhythm-card__list {
  margin: calc(var(--step) * 1.5) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: calc(var(--step) * 1.25);
}

.page-about .rhythm-card__list li {
  position: relative;
  padding-left: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.page-about .rhythm-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 10px;
  height: 2px;
  background: var(--volt);
}

.page-about .rhythm-card--match .rhythm-card__list li::before {
  background: var(--amber);
}

/* -------- 06 三件事 -------- */
.page-about .about-pledge {
  padding: calc(var(--step) * 9) 0 calc(var(--step) * 9);
  background:
    radial-gradient(100% 70% at 12% 100%, rgba(200, 255, 61, 0.09), transparent 62%),
    var(--turf);
}

.page-about .pledge-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--grid-line);
  border: var(--about-hair);
}

.page-about .pledge {
  display: grid;
  gap: calc(var(--step) * 1.25);
  padding: calc(var(--step) * 3);
  background: var(--ink-deep);
  transition: background var(--t-base) var(--ease);
}

.page-about .pledge:hover {
  background: var(--night-blue);
}

.page-about .pledge__n {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--volt);
}

.page-about .pledge__title {
  font-size: clamp(1.08rem, 1rem + 0.5vw, 1.4rem);
  letter-spacing: -0.008em;
}

.page-about .pledge__text {
  font-size: 0.94rem;
  max-width: 62ch;
}

.page-about .pledge-cta {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--step) * 1.5);
  margin-top: calc(var(--step) * 5);
  padding-top: calc(var(--step) * 4);
  border-top: var(--about-hair);
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  font-family: var(--f-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1px solid var(--grid-line);
  transition: background var(--t-base) var(--ease), color var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

.page-about .btn--solid {
  background: var(--volt);
  color: var(--ink-deep);
  border-color: var(--volt);
}

.page-about .btn--solid:hover,
.page-about .btn--solid:focus-visible {
  background: var(--text-bright);
  border-color: var(--text-bright);
}

.page-about .btn--ghost {
  color: var(--text-bright);
  background: transparent;
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--volt);
  color: var(--volt);
}

.page-about a:focus-visible,
.page-about .btn:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: 2px;
}

/* -------- 断点 -------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-flow__layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--step) * 6) 0 calc(var(--step) * 10);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: calc(var(--step) * 7);
    align-items: start;
  }

  .page-about .about-hero__art {
    aspect-ratio: 5 / 6;
    align-self: stretch;
  }

  .page-about .about-tl__item {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: start;
    column-gap: calc(var(--step) * 3);
  }

  .page-about .about-tl__year {
    padding-top: 6px;
    text-align: right;
  }

  .page-about .about-tl__title {
    grid-column: 2;
  }

  .page-about .about-tl__text {
    grid-column: 2;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: calc(var(--step) * 6);
    align-items: start;
  }

  .page-about .about-team__roles {
    border-top: var(--about-hair);
  }

  .page-about .about-zones__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: calc(var(--step) * 6);
    align-items: start;
  }

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

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

@media (min-width: 1200px) {
  .page-about .about-rail {
    display: block;
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 6;
    border-left: var(--about-hair);
    border-top: var(--about-hair);
    border-bottom: var(--about-hair);
    background: rgba(6, 17, 12, 0.86);
    backdrop-filter: blur(3px);
    padding: calc(var(--step) * 1.5) 0;
  }

  .page-about .about-rail__list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: calc(var(--step) * 0.75);
  }

  .page-about .about-rail__link {
    display: grid;
    grid-template-columns: 26px 0;
    align-items: center;
    gap: 0;
    padding: 5px 10px 5px 8px;
    text-decoration: none;
    color: var(--text-dim);
    border-right: 2px solid transparent;
    overflow: hidden;
    transition: color var(--t-base) var(--ease), border-color var(--t-base) var(--ease), grid-template-columns var(--t-base) var(--ease), background var(--t-base) var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--volt);
    border-right-color: var(--volt);
    grid-template-columns: 26px 84px;
    background: rgba(200, 255, 61, 0.05);
  }

  .page-about .about-rail__num {
    font-size: 11px;
    letter-spacing: 0.12em;
  }

  .page-about .about-rail__label {
    font-size: 12px;
    white-space: nowrap;
    color: var(--text-bright);
  }
}

@media (min-width: 1320px) {
  .page-about .shell {
    padding-right: calc(var(--about-rail-w) + 16px);
  }
}