.page-about {
  --about-rail-w: 200px;
  --about-gap: clamp(26px, 4.5vw, 60px);
  background: var(--ink);
  color: var(--white);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(38px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -12% -6% auto -6%;
  height: 132%;
  background:
    radial-gradient(820px 420px at 82% 8%, rgba(41, 240, 208, 0.14), transparent 62%),
    radial-gradient(620px 360px at 6% 80%, rgba(255, 122, 26, 0.11), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(to bottom, rgba(245, 248, 250, 0.045) 0 1px, transparent 1px 5px);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  margin-top: clamp(24px, 4vw, 46px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  align-items: end;
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(33px, 6.4vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title .hl {
  color: var(--cyan);
}

.page-about .about-hero__text {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 248, 250, 0.84);
}

.page-about .about-hero__actions {
  margin-top: clamp(20px, 3vw, 30px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-score {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 22px);
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(16, 26, 36, 0.96), rgba(11, 19, 28, 0.96));
  box-shadow: var(--shadow-float);
}

.page-about .about-score__cell {
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-score__cell:nth-child(2) {
  border-left-color: var(--orange);
}

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

.page-about .about-score__cell:nth-child(4) {
  border-left-color: var(--clay);
}

.page-about .about-score__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.6vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-score__num span {
  margin-left: 3px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
}

.page-about .about-score__label {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  padding-bottom: clamp(56px, 9vw, 120px);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .rail-list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--white);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  border-color: var(--cyan-edge);
  background: rgba(41, 240, 208, 0.1);
}

/* ---------- 章节块 ---------- */

.page-about .about-block {
  position: relative;
  scroll-margin-top: calc(var(--header-h) + 30px);
  padding: clamp(30px, 5vw, 54px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-block--tint {
  border-top-color: rgba(94, 122, 102, 0.5);
}

.page-about .about-block--tint::before {
  content: "";
  position: absolute;
  inset: 0 -6% 0 -6%;
  background: linear-gradient(180deg, rgba(94, 122, 102, 0.13), rgba(7, 12, 20, 0) 78%);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.page-about .about-block > * {
  position: relative;
}

.page-about .block-code {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .block-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .block-lead {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .block-body {
  margin-top: clamp(16px, 2.6vw, 24px);
  max-width: 60ch;
}

.page-about .block-body p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 248, 250, 0.82);
}

.page-about .block-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 图片 ---------- */

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

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 流程 ---------- */

.page-about .flow-layout {
  margin-top: clamp(22px, 3.4vw, 34px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
  align-items: start;
}

.page-about .flow-steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  position: relative;
  padding: 0 0 clamp(18px, 2.8vw, 26px) 28px;
  border-left: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

.page-about .flow-step:last-child {
  padding-bottom: 0;
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan-edge);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .flow-step:hover,
.page-about .flow-step:focus-within {
  border-left-color: var(--cyan-edge);
}

.page-about .flow-step:hover::before,
.page-about .flow-step:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px var(--cyan-soft);
}

.page-about .flow-step__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--moss);
}

.page-about .flow-step__title {
  margin: 6px 0 0;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.35;
}

.page-about .flow-step__text {
  margin: 8px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 248, 250, 0.72);
}

/* ---------- 团队 ---------- */

.page-about .team-total {
  margin-top: clamp(20px, 3vw, 30px);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 16px 20px;
  border-radius: var(--radius);
  border: 1px solid rgba(41, 240, 208, 0.32);
  background: linear-gradient(120deg, rgba(41, 240, 208, 0.1), rgba(7, 12, 20, 0));
}

.page-about .team-total__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(40px, 7vw, 62px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .team-total__label {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(245, 248, 250, 0.8);
}

.page-about .team-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .team-card {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 26px;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .team-card__title {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 600;
}

.page-about .team-card__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .team-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--moss);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(245, 248, 250, 0.82);
}

/* ---------- 赛季刻度 ---------- */

.page-about .season-layout {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
  align-items: start;
}

.page-about .season-track {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .season-node {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 26px);
  padding: clamp(16px, 2.6vw, 22px) 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}

.page-about .season-node:hover {
  background: linear-gradient(90deg, rgba(41, 240, 208, 0.07), rgba(7, 12, 20, 0));
}

.page-about .season-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.8vw, 26px);
  letter-spacing: 0.04em;
  color: var(--cyan);
  min-width: 4.5em;
}

.page-about .season-node:nth-child(2) .season-node__year {
  color: var(--clay);
}

.page-about .season-node:nth-child(3) .season-node__year {
  color: var(--moss);
}

.page-about .season-node:nth-child(4) .season-node__year {
  color: var(--orange);
}

.page-about .season-node__title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .season-node__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(245, 248, 250, 0.74);
}

/* ---------- 伙伴 ---------- */

.page-about .partner-list {
  margin-top: clamp(20px, 3vw, 28px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .partner-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--moss);
}

.page-about .partner-item:nth-child(2) {
  border-left-color: var(--clay);
}

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

.page-about .partner-item__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 4.6vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
  min-width: 1.6em;
}

.page-about .partner-item__title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
}

.page-about .partner-item__text {
  margin: 8px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 248, 250, 0.74);
}

.page-about .honor {
  margin-top: clamp(22px, 3.2vw, 32px);
  padding: 18px 20px;
  border-radius: var(--radius);
  border: 1px solid rgba(169, 106, 76, 0.45);
  background: linear-gradient(120deg, rgba(169, 106, 76, 0.24), rgba(94, 122, 102, 0.16));
}

.page-about .honor__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: rgba(245, 248, 250, 0.7);
}

.page-about .honor__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--white);
}

/* ---------- 投入 ---------- */

.page-about .roadmap-layout {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
  align-items: start;
}

.page-about .roadmap-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .roadmap-item {
  padding: clamp(14px, 2.4vw, 20px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .roadmap-item:first-child {
  border-top: 1px solid var(--line);
}

.page-about .roadmap-item__title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
}

.page-about .roadmap-item__title::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 10px;
  border-radius: 50%;
  background: var(--cyan);
  vertical-align: middle;
}

.page-about .roadmap-item__text {
  margin: 8px 0 0 17px;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 248, 250, 0.74);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: clamp(34px, 5vw, 64px);
  padding: clamp(26px, 4.6vw, 52px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(620px 300px at 88% 0%, rgba(255, 122, 26, 0.2), transparent 70%),
    linear-gradient(150deg, var(--surface), var(--ink-2));
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-about .about-cta__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-cta__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.8vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 248, 250, 0.82);
}

.page-about .about-cta__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta a:focus-visible,
.page-about .rail-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 平板与桌面 ---------- */

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .flow-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  }

  .page-about .season-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-about .roadmap-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-about .partner-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .partner-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-top: clamp(30px, 5vw, 54px);
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    position: relative;
  }

  .page-about .rail-list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: var(--line);
  }

  .page-about .rail-link {
    position: relative;
    padding: 10px 0 10px 26px;
    border: 0;
    border-radius: 0;
    background: transparent;
    font-size: 14px;
  }

  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--ink);
    border: 1px solid var(--line);
    transform: translateY(-50%);
    transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    background: transparent;
  }

  .page-about .rail-link:hover::before,
  .page-about .rail-link:focus-visible::before {
    background: var(--cyan);
    border-color: var(--cyan);
    box-shadow: 0 0 0 4px var(--cyan-soft);
  }

  .page-about .rail-label {
    color: var(--muted);
    transition: color var(--dur) var(--ease);
  }

  .page-about .rail-link:hover .rail-label,
  .page-about .rail-link:focus-visible .rail-label {
    color: var(--white);
  }

  .page-about .about-block--offset {
    margin-left: clamp(0px, 4vw, 64px);
  }

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

  .page-about .about-figure--portrait {
    margin-top: clamp(6px, 2vw, 26px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}