.page-about {
  background: var(--ink-900);
  color: var(--ice);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .hero-about {
  position: relative;
  isolation: isolate;
  padding: clamp(28px, 6vw, 56px) 0 clamp(56px, 9vw, 104px);
  overflow: hidden;
}

.page-about .hero-about__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .hero-about__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
  opacity: 0.34;
}

.page-about .hero-about::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    repeating-linear-gradient(0deg, rgba(30, 58, 95, 0.34) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(90deg, rgba(30, 58, 95, 0.34) 0 1px, transparent 1px 24px),
    linear-gradient(180deg, rgba(7, 20, 38, 0.62) 0%, rgba(7, 20, 38, 0.88) 62%, var(--ink-900) 100%);
}

.page-about .hero-about__inner {
  position: relative;
}

.page-about .hero-about__tag {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: clamp(28px, 5vw, 48px) 0 clamp(14px, 2vw, 20px);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .hero-about__mark {
  width: 26px;
  height: 12px;
  background: var(--orange);
  clip-path: polygon(22% 0, 100% 0, 78% 100%, 0 100%);
}

.page-about .hero-about__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(42px, 9.5vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.page-about .hero-about__hl {
  color: var(--cyan);
}

.page-about .hero-about__lede {
  max-width: 62ch;
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: clamp(16px, 2.4vw, 18px);
  line-height: 1.8;
  color: var(--ice);
}

.page-about .hero-about__stats {
  display: grid;
  gap: 18px;
  margin: clamp(36px, 6vw, 60px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-about__stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.page-about .hero-about__num {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .hero-about__key {
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 斜切分隔带 ---------- */
.page-about .slash-band {
  height: 54px;
  margin: 0;
  background:
    linear-gradient(100deg, transparent 0 46%, var(--cyan) 46% 49%, transparent 49% 100%),
    linear-gradient(100deg, transparent 0 62%, var(--orange) 62% 64%, transparent 64% 100%),
    var(--ink-800);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .slash-band--reverse {
  background:
    linear-gradient(80deg, transparent 0 30%, var(--orange) 30% 32%, transparent 32% 100%),
    linear-gradient(80deg, transparent 0 52%, var(--cyan) 52% 55%, transparent 55% 100%),
    var(--ink-800);
}

/* ---------- 章节通用 ---------- */
.page-about .chapter {
  padding: clamp(56px, 9vw, 96px) 0;
}

.page-about .chapter__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .chapter__intro .eyebrow {
  margin: 0 0 12px;
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5.6vw, 46px);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.page-about .chapter__body p {
  margin: 0 0 18px;
  font-size: clamp(16px, 2.2vw, 17px);
  line-height: 1.85;
  color: var(--ice);
  max-width: 68ch;
}

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

/* ---------- 时间线 ---------- */
.page-about .chapter--timeline {
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 22%, var(--ink-800) 78%, var(--ink-900) 100%);
  border-top: 1px solid var(--line);
}

.page-about .tl {
  display: grid;
  gap: 28px;
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .tl-axis {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .tl-axis__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 0 0 auto;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 0;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  background: var(--ink-700);
  text-decoration: none;
  transition: border-color var(--t-fast), background-color var(--t-fast);
}

.page-about .tl-axis__year {
  font-size: 20px;
  font-weight: 700;
  color: var(--ice);
  transition: color var(--t-fast);
}

.page-about .tl-axis__label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .tl-axis__item:hover,
.page-about .tl-axis__item:focus-visible {
  border-color: var(--cyan);
  background: var(--ink-800);
}

.page-about .tl-axis__item:hover .tl-axis__year,
.page-about .tl-axis__item:focus-visible .tl-axis__year {
  color: var(--cyan);
}

.page-about .tl-body {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .tl-block {
  position: relative;
  padding: clamp(20px, 3.4vw, 32px) clamp(18px, 3vw, 32px);
  background: var(--ink-900);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  transition: border-color var(--t-mid);
}

.page-about .tl-block::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--cyan);
  transition: width var(--t-mid);
}

.page-about .tl-block:hover {
  border-color: #2b5079;
}

.page-about .tl-block:hover::before {
  width: 100%;
}

.page-about .tl-block__version {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .tl-block__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.3;
}

.page-about .tl-block p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ice);
  max-width: 62ch;
}

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

.page-about .tl-block__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .tl-block__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

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

.page-about .tl-figure__frame {
  overflow: hidden;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  background: var(--ink-700);
}

.page-about .tl-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .tl-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 56ch;
}

/* ---------- 团队 ---------- */
.page-about .chapter--team {
  border-top: 1px solid var(--line);
}

.page-about .team {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .team__bars {
  display: grid;
  gap: 20px;
}

.page-about .team-row {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .team-row__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .team-row__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--ice);
}

.page-about .team-row__num {
  font-size: 20px;
  font-weight: 700;
  color: var(--mist);
  transition: color var(--t-fast);
}

.page-about .team-bar {
  display: block;
  position: relative;
  height: 6px;
  background: var(--ink-700);
  overflow: hidden;
  transition: height var(--t-fast);
}

.page-about .team-bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--w);
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: filter var(--t-fast);
}

.page-about .team-row__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 60ch;
}

.page-about .team-row:hover .team-row__num,
.page-about .team-row:focus-within .team-row__num {
  color: var(--cyan);
}

.page-about .team-row:hover .team-bar {
  height: 10px;
}

.page-about .team-row:hover .team-bar::after {
  filter: brightness(1.25);
}

.page-about .team__aside {
  padding: clamp(20px, 3.4vw, 32px);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .team__aside-num {
  margin: 0;
  font-size: clamp(44px, 9vw, 64px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .team__aside-label {
  margin: 8px 0 16px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .team__aside-text {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ice);
}

.page-about .team__aside-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: var(--gold-lift);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 2px;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .team__aside-link:hover,
.page-about .team__aside-link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 合作生态 ---------- */
.page-about .chapter--eco {
  background: var(--ink-800);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .eco {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .eco__visual {
  position: relative;
}

.page-about .eco__frame {
  overflow: hidden;
  border: 1px solid var(--line);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
}

.page-about .eco__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: 0.72;
}

.page-about .eco__lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.page-about .eco__lines path {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.2;
  transition: stroke var(--t-mid);
}

.page-about .eco__lines circle {
  fill: var(--cyan);
  opacity: 0.65;
  transition: opacity var(--t-mid), fill var(--t-mid);
}

.page-about .eco:hover .eco__lines path {
  stroke: var(--cyan);
}

.page-about .eco:hover .eco__lines circle {
  fill: var(--orange);
  opacity: 1;
}

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

.page-about .eco-cell {
  padding: 18px 18px 20px;
  background: var(--ink-900);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  transition: border-color var(--t-fast), background-color var(--t-fast), transform var(--t-fast);
}

.page-about .eco-cell:hover {
  border-color: var(--cyan);
  background: var(--ink-700);
  transform: translateY(-2px);
}

.page-about .eco-cell__num {
  display: block;
  font-size: clamp(28px, 5vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .eco-cell__unit {
  display: block;
  margin: 6px 0 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ice);
}

.page-about .eco-cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 运营节奏 ---------- */
.page-about .rhythm {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .rhythm__item {
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-800);
  border-top: 2px solid var(--line);
  transition: border-color var(--t-mid);
}

.page-about .rhythm__item:hover {
  border-top-color: var(--orange);
}

.page-about .rhythm__num {
  margin: 0 0 12px;
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .rhythm__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ice);
}

.page-about .rhythm__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .rhythm__more {
  margin: clamp(24px, 4vw, 36px) 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .rhythm__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 1px;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .rhythm__more a:hover,
.page-about .rhythm__more a:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 结尾 ---------- */
.page-about .chapter--cta {
  padding-bottom: clamp(64px, 10vw, 112px);
}

.page-about .cta-box {
  display: grid;
  gap: 24px;
  padding: clamp(24px, 4vw, 48px);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(40, 224, 208, 0.16) 0%, transparent 58%),
    var(--ink-800);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-about .cta-box__text h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 36px);
  line-height: 1.25;
}

.page-about .cta-box__text p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 58ch;
}

.page-about .cta-box__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .cta-box__actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 24px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0;
  transition: transform var(--t-fast), filter var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}

.page-about .cta-box__actions .btn--gold {
  background: var(--gold);
  color: var(--ink-900);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .cta-box__actions .btn--gold:hover,
.page-about .cta-box__actions .btn--gold:focus-visible {
  background: var(--gold-lift);
  transform: translateX(2px);
}

.page-about .cta-box__actions .btn--ghost {
  border: 1px solid var(--line);
  color: var(--ice);
  background: transparent;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .hero-about__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

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

  .page-about .eco-cell--wide {
    grid-column: span 2;
  }

  .page-about .rhythm {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .cta-box {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .chapter__grid {
    grid-template-columns: 4fr 7fr;
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .chapter__intro {
    position: sticky;
    top: 96px;
  }

  .page-about .tl {
    grid-template-columns: 186px 1fr;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .tl-axis {
    position: sticky;
    top: 96px;
    flex-direction: column;
    gap: 10px;
    align-self: start;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .tl-axis__item {
    width: 100%;
  }

  .page-about .team {
    grid-template-columns: 7fr 5fr;
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-about .team__aside {
    position: sticky;
    top: 96px;
  }

  .page-about .eco {
    grid-template-columns: 5fr 7fr;
    align-items: center;
    gap: clamp(32px, 4vw, 56px);
  }

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

  .page-about .rhythm {
    gap: 20px;
  }

  .page-about .rhythm__item:nth-child(2) {
    transform: translateY(24px);
  }

  .page-about .rhythm__item:nth-child(3) {
    transform: translateY(48px);
  }

  .page-about .rhythm__more {
    margin-top: 88px;
  }
}

@media (min-width: 1120px) {
  .page-about .hero-about__stats {
    max-width: 860px;
  }

  .page-about .eco__cells {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    transform: none !important;
  }
}

.page-about {
  --w: 1rem;
}