.page-about {
  --about-chip-gap: 8px;
  background: var(--deep-night);
  color: var(--sand);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 46px) 0 clamp(34px, 6vw, 76px);
  border-bottom: 2px solid var(--hairline);
  overflow: hidden;
  background:
    radial-gradient(880px 460px at 80% -12%, rgba(45, 226, 230, 0.16), transparent 70%),
    radial-gradient(680px 420px at 6% 112%, rgba(255, 107, 90, 0.13), transparent 72%),
    linear-gradient(180deg, var(--deep-ink) 0%, var(--deep-night) 72%, var(--deep-night) 100%);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  min-width: 0;
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
  }
}

.page-about .about-hero__copy {
  display: grid;
  gap: 14px;
  align-content: start;
  min-width: 0;
}

.page-about .about-hero__copy h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.012em;
  color: var(--sand);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: var(--step-0);
  line-height: 1.85;
  color: rgba(244, 247, 251, 0.86);
}

.page-about .about-hero__meta {
  margin: 4px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__meta span {
  padding: 5px 10px;
  border: 1px solid var(--hairline);
  background: rgba(11, 36, 71, 0.6);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* 首屏视觉 */
.page-about .hero-visual {
  position: relative;
  width: 100%;
  max-width: 520px;
  margin-inline: auto;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 2px solid var(--hairline-strong);
  box-shadow: var(--shadow-hard);
  background:
    radial-gradient(circle at 50% 50%, rgba(45, 226, 230, 0.16), transparent 60%),
    repeating-linear-gradient(90deg, rgba(143, 163, 184, 0.08) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(0deg, rgba(143, 163, 184, 0.08) 0 1px, transparent 1px 46px),
    var(--deep-card);
}

.page-about .hero-visual__glow {
  position: absolute;
  inset: 12%;
  border: 2px solid rgba(45, 226, 230, 0.22);
  border-radius: 50%;
  box-shadow: 0 0 0 24px rgba(167, 139, 250, 0.06);
  pointer-events: none;
}

.page-about .hero-visual__core {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 4px;
  justify-items: center;
  padding: clamp(14px, 3.6vw, 24px) clamp(18px, 5vw, 34px);
  border: 2px solid var(--neon-cyan);
  background: rgba(2, 8, 18, 0.88);
  box-shadow: 0 0 0 8px rgba(45, 226, 230, 0.07), var(--shadow-hard);
}

.page-about .hero-visual__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--neon-cyan);
}

.page-about .hero-visual__cap {
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .hero-visual__chips {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-visual__chip {
  position: absolute;
  padding: 4px 8px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
  background: rgba(2, 8, 18, 0.9);
  border: 1px solid currentColor;
}

.page-about .hero-visual__chip--strategy { color: var(--neon-coral); }
.page-about .hero-visual__chip--puzzle { color: var(--neon-cyan); }
.page-about .hero-visual__chip--action { color: var(--neon-violet); }
.page-about .hero-visual__chip--sim { color: var(--neon-green); }
.page-about .hero-visual__chip--table { color: var(--neon-amber); }
.page-about .hero-visual__chip--race { color: var(--mist); }

.page-about .hero-visual__chip:nth-child(1) { top: 5%; left: 50%; transform: translateX(-50%); }
.page-about .hero-visual__chip:nth-child(2) { top: 25%; right: 3%; }
.page-about .hero-visual__chip:nth-child(3) { bottom: 25%; right: 3%; }
.page-about .hero-visual__chip:nth-child(4) { bottom: 5%; left: 50%; transform: translateX(-50%); }
.page-about .hero-visual__chip:nth-child(5) { bottom: 25%; left: 3%; }
.page-about .hero-visual__chip:nth-child(6) { top: 25%; left: 3%; }

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  padding-block: clamp(38px, 6vw, 88px);
}

.page-about .about-shell__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 44px);
  min-width: 0;
}

@media (min-width: 1040px) {
  .page-about .about-shell__grid {
    grid-template-columns: 216px minmax(0, 1fr);
    align-items: start;
  }
}

/* 章节目录 */
.page-about .about-toc {
  padding: 14px;
  border: 2px solid var(--hairline);
  background: rgba(11, 36, 71, 0.55);
  min-width: 0;
}

@media (min-width: 1040px) {
  .page-about .about-toc {
    position: sticky;
    top: clamp(88px, 12vh, 128px);
  }
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-toc__list {
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: thin;
  max-width: 100%;
}

@media (min-width: 1040px) {
  .page-about .about-toc__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px;
  white-space: nowrap;
  font-size: 0.875rem;
  text-decoration: none;
  color: var(--mist);
  border-left: 3px solid transparent;
  transition: color 0.18s var(--ease-out), border-color 0.18s var(--ease-out), background-color 0.18s var(--ease-out);
}

.page-about .about-toc__num {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: var(--mist);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--sand);
  border-left-color: var(--hairline-strong);
  background: rgba(143, 163, 184, 0.08);
}

.page-about .about-toc__link.is-active {
  color: var(--neon-cyan);
  border-left-color: var(--neon-cyan);
  background: rgba(45, 226, 230, 0.08);
}

.page-about .about-toc__link.is-active .about-toc__num {
  color: var(--neon-cyan);
}

/* 内容列 */
.page-about .about-content {
  display: grid;
  gap: clamp(48px, 6vw, 88px);
  min-width: 0;
}

.page-about .about-section {
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
  min-width: 0;
  scroll-margin-top: clamp(96px, 14vh, 150px);
}

.page-about .about-section__head {
  display: grid;
  gap: 10px;
  max-width: 66ch;
}

.page-about .about-section__index {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon-cyan);
}

.page-about .about-section__index::after {
  content: "";
  width: 44px;
  height: 2px;
  background: currentColor;
  opacity: 0.5;
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 2.8vw, 2.25rem);
  line-height: 1.18;
  letter-spacing: -0.006em;
  color: var(--sand);
  text-wrap: balance;
}

.page-about .about-section__lead {
  margin: 0;
  max-width: 66ch;
  font-size: var(--step-0);
  line-height: 1.85;
  color: rgba(244, 247, 251, 0.82);
}

.page-about .about-prose {
  display: grid;
  gap: 14px;
  max-width: 70ch;
}

.page-about .about-prose p {
  margin: 0;
  line-height: 1.85;
  color: rgba(244, 247, 251, 0.86);
}

/* 配图 */
.page-about .about-figure {
  margin: 0;
  border: 2px solid var(--hairline-strong);
  background: var(--deep-ink);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--mist);
  border-top: 1px solid var(--hairline);
}

/* ---------- 原则卡 ---------- */
.page-about .principle-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

@media (min-width: 760px) {
  .page-about .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .principle-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .principle-card:nth-child(2) { margin-top: 22px; }
  .page-about .principle-card:nth-child(3) { margin-top: 44px; }
}

.page-about .principle-card {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: 20px clamp(16px, 2vw, 22px) 22px;
  border: 2px solid var(--hairline);
  border-top: 6px solid var(--neon-cyan);
  background: var(--deep-card);
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out), border-color 0.2s var(--ease-out);
}

.page-about .principle-card:nth-child(2) { border-top-color: var(--neon-coral); }
.page-about .principle-card:nth-child(3) { border-top-color: var(--neon-violet); }

.page-about .principle-card:hover,
.page-about .principle-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hard);
  border-color: var(--hairline-strong);
  border-top-color: var(--neon-cyan);
}

.page-about .principle-card:nth-child(2):hover { border-top-color: var(--neon-coral); }
.page-about .principle-card:nth-child(3):hover { border-top-color: var(--neon-violet); }

.page-about .principle-card__num {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .principle-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.0625rem;
  line-height: 1.35;
  color: var(--sand);
}

.page-about .principle-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(244, 247, 251, 0.84);
}

.page-about .principle-card ul {
  margin: 0;
  padding-left: 16px;
  display: grid;
  gap: 6px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 620px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .team-card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 18px;
  border: 2px solid var(--hairline-strong);
  background: linear-gradient(155deg, rgba(11, 36, 71, 0.94), rgba(6, 24, 46, 0.94));
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out), border-color 0.2s var(--ease-out);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--neon-cyan);
  box-shadow: var(--shadow-hard);
}

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

.page-about .team-card__dot {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  background: var(--neon-cyan);
  box-shadow: 0 0 0 3px rgba(45, 226, 230, 0.2);
}

.page-about .team-card:nth-child(1) .team-card__dot {
  background: var(--neon-coral);
  box-shadow: 0 0 0 3px rgba(255, 107, 90, 0.2);
}

.page-about .team-card:nth-child(2) .team-card__dot {
  background: var(--neon-cyan);
  box-shadow: 0 0 0 3px rgba(45, 226, 230, 0.2);
}

.page-about .team-card:nth-child(3) .team-card__dot {
  background: var(--neon-green);
  box-shadow: 0 0 0 3px rgba(110, 243, 165, 0.2);
}

.page-about .team-card:nth-child(4) .team-card__dot {
  background: var(--neon-violet);
  box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.2);
}

.page-about .team-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  line-height: 1.35;
  color: var(--sand);
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(244, 247, 251, 0.82);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon-cyan), var(--neon-violet) 55%, var(--neon-amber));
  opacity: 0.7;
}

.page-about .timeline__item {
  position: relative;
  padding: 14px 16px;
  border: 2px solid var(--hairline);
  background: rgba(11, 36, 71, 0.52);
  transition: border-color 0.2s var(--ease-out), background-color 0.2s var(--ease-out);
}

.page-about .timeline__item:hover,
.page-about .timeline__item:focus-within {
  border-color: var(--neon-cyan);
  background: rgba(11, 36, 71, 0.82);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 18px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  transform: rotate(45deg);
  background: var(--deep-ink);
  border: 2px solid var(--neon-cyan);
}

.page-about .timeline__ver {
  display: inline-block;
  padding: 3px 8px;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--deep-ink);
  background: var(--neon-amber);
}

.page-about .timeline__title {
  margin: 9px 0 4px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  line-height: 1.35;
  color: var(--sand);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: rgba(244, 247, 251, 0.8);
}

/* ---------- 规模数据 ---------- */
.page-about .metric-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

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

@media (min-width: 1120px) {
  .page-about .metric-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .metric {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 18px;
  border: 2px solid var(--hairline);
  background: var(--deep-card);
}

.page-about .metric__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 3.6vw, 2.5rem);
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--sand);
}

.page-about .metric__num small {
  font-size: 0.44em;
  font-weight: 700;
  letter-spacing: 0;
  margin-left: 4px;
  color: var(--mist);
}

.page-about .metric__label {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .metric__bar {
  position: relative;
  height: 6px;
  margin-top: 10px;
  background: rgba(143, 163, 184, 0.16);
  overflow: hidden;
}

.page-about .metric__bar span {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  display: block;
  background: var(--neon-cyan);
}

.page-about .metric--a .metric__bar span { width: 96%; background: var(--neon-cyan); }
.page-about .metric--b .metric__bar span { width: 78%; background: var(--neon-coral); }
.page-about .metric--c .metric__bar span { width: 62%; background: var(--neon-violet); }
.page-about .metric--d .metric__bar span { width: 88%; background: var(--neon-amber); }
.page-about .metric--e .metric__bar span { width: 70%; background: var(--neon-green); }
.page-about .metric--f .metric__bar span { width: 54%; background: var(--mist); }

/* ---------- 合作生态 ---------- */
.page-about .partner-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  align-items: center;
}

@media (min-width: 880px) {
  .page-about .partner-layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }
}

.page-about .partner-ring {
  position: relative;
  width: min(100%, 340px);
  margin-inline: auto;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: 50%;
  border: 2px solid var(--hairline-strong);
  box-shadow: var(--shadow-hard);
  background: var(--deep-card);
}

.page-about .partner-ring img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.8;
}

.page-about .partner-ring::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-shadow: inset 0 0 0 18px rgba(6, 24, 46, 0.6);
  pointer-events: none;
}

.page-about .partner-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .partner-list li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border-left: 4px solid var(--neon-coral);
  background: rgba(11, 36, 71, 0.55);
}

.page-about .partner-list li:nth-child(2) { border-left-color: var(--neon-violet); }
.page-about .partner-list li:nth-child(3) { border-left-color: var(--neon-cyan); }
.page-about .partner-list li:nth-child(4) { border-left-color: var(--neon-green); }

.page-about .partner-list strong {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.9375rem;
  line-height: 1.4;
  color: var(--sand);
}

.page-about .partner-list span {
  font-size: 0.875rem;
  line-height: 1.75;
  color: rgba(244, 247, 251, 0.8);
}

/* ---------- 收束区 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 14px;
  padding: clamp(22px, 4vw, 38px);
  border: 2px solid var(--hairline-strong);
  background:
    radial-gradient(460px 260px at 92% 0%, rgba(45, 226, 230, 0.16), transparent 70%),
    linear-gradient(150deg, var(--deep-card), var(--deep-ink));
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__eyebrow {
  margin: 0;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neon-cyan);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 2.8vw, 2.1rem);
  line-height: 1.2;
  color: var(--sand);
  text-wrap: balance;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 64ch;
  font-size: var(--step-0);
  line-height: 1.85;
  color: rgba(244, 247, 251, 0.84);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.page-about .about-cta__links {
  margin: 6px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 0.875rem;
}

.page-about .about-cta__links a {
  color: var(--neon-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 226, 230, 0.4);
  padding-bottom: 1px;
}

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

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-about .hero-visual__chip {
    padding: 3px 6px;
    font-size: 0.625rem;
    letter-spacing: 0.03em;
  }
  .page-about .timeline {
    padding-left: 24px;
  }
  .page-about .timeline__item::before {
    left: -24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle-card,
  .page-about .team-card,
  .page-about .timeline__item,
  .page-about .about-toc__link {
    transition: none;
  }
  .page-about .principle-card:hover,
  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}