.page-about {
  --about-speed: 180ms ease;
  --about-green-line: rgba(46, 82, 122, 0.85);
  background:
    radial-gradient(90% 55% at 50% -8%, rgba(18, 52, 90, 0.62), transparent 70%),
    var(--ink);
  color: var(--ice);
  overflow-x: clip;
}

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

.page-about .btn {
  transition: transform var(--about-speed), box-shadow var(--about-speed),
    background-color var(--about-speed), color var(--about-speed);
}

.page-about .btn:hover {
  transform: translateY(-2px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(18px, 4vw, 36px) clamp(34px, 6vw, 72px);
  border-bottom: 2px solid var(--steel);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 8vw, 72px);
  line-height: 1;
  letter-spacing: -0.012em;
  color: var(--white);
}

.page-about .about-lede {
  max-width: 48ch;
  margin: 18px 0 0;
  color: var(--mist);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
}

.page-about .about-metrics-hero {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-metric {
  border: 1px solid var(--about-green-line);
  border-left: 3px solid var(--cyan);
  background: rgba(11, 34, 61, 0.78);
  padding: 10px 12px;
}

.page-about .about-metric-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-about .about-metric-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

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

.page-about .about-hero-art {
  position: relative;
  padding: 6px 10px 10px 0;
}

.page-about .about-hero-art::before,
.page-about .about-hero-art::after {
  content: "";
  position: absolute;
  border: 2px solid var(--steel);
  z-index: 0;
}

.page-about .about-hero-art::before {
  inset: 18px -6px 0 14px;
  background: rgba(18, 52, 90, 0.55);
}

.page-about .about-hero-art::after {
  inset: 32px -14px 0 26px;
  border-color: rgba(46, 82, 122, 0.5);
}

.page-about .about-hero-media {
  position: relative;
  z-index: 1;
  margin: 0;
  border: 2px solid var(--steel);
  box-shadow: var(--shadow-lift);
  background: var(--panel);
  overflow: hidden;
}

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

.page-about .about-art-tag {
  position: absolute;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 5px 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--orange);
  box-shadow: 3px 3px 0 rgba(2, 9, 18, 0.85);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding-block: clamp(32px, 6vw, 68px);
}

.page-about .about-index {
  border: 2px solid var(--steel);
  background: rgba(11, 34, 61, 0.72);
  padding: 12px;
}

.page-about .about-index-title {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-index-list a {
  display: block;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--about-green-line);
  color: var(--ice);
  font-size: 14px;
  text-decoration: none;
  transition: background-color var(--about-speed), color var(--about-speed),
    border-color var(--about-speed);
}

.page-about .about-index-list a:hover {
  border-color: var(--cyan);
  background: rgba(36, 224, 255, 0.12);
  color: var(--cyan);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(38px, 6vw, 76px);
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: 96px;
}

.page-about .about-sec-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4.4vw, 42px);
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-sec-lede {
  max-width: 60ch;
  margin: 12px 0 0;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.78;
}

/* ---------- 维护年轮 ---------- */
.page-about .about-tl {
  display: grid;
  gap: 16px;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl-item {
  position: relative;
  display: grid;
  gap: 10px;
  padding: 20px 18px 20px 24px;
  border: 2px solid var(--steel);
  background: linear-gradient(170deg, rgba(18, 52, 90, 0.7), rgba(8, 28, 51, 0.96));
  box-shadow: var(--shadow-hard);
  transition: transform var(--about-speed), box-shadow var(--about-speed),
    border-color var(--about-speed);
  scroll-margin-top: 96px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--cyan), var(--teal));
}

.page-about .about-tl-item:hover,
.page-about .about-tl-item:focus-within {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lift);
  border-color: var(--cyan);
}

.page-about .about-tl-item--now {
  border-color: var(--orange);
}

.page-about .about-tl-item--now::before {
  background: linear-gradient(180deg, var(--orange), #b04b06);
}

.page-about .about-tl-mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .about-tl-tab {
  padding: 3px 9px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--cyan);
}

.page-about .about-tl-item--now .about-tl-tab {
  background: var(--orange);
}

.page-about .about-tl-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(24px, 5.4vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-tl-item--now .about-tl-num {
  color: var(--ice);
}

.page-about .about-tl-body h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ice);
}

.page-about .about-tl-body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-team-card {
  border: 2px solid var(--steel);
  background: linear-gradient(160deg, rgba(18, 52, 90, 0.86), rgba(11, 34, 61, 0.96));
  padding: 20px;
  box-shadow: var(--shadow-hard);
  transition: transform var(--about-speed), box-shadow var(--about-speed),
    border-color var(--about-speed);
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-within {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lift);
  border-color: var(--cyan);
}

.page-about .about-team-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(32px, 7vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-team-lead .about-team-num {
  font-size: clamp(46px, 10vw, 78px);
  color: var(--orange);
}

.page-about .about-team-card h3 {
  margin: 10px 0 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ice);
}

.page-about .about-team-card p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-team-media {
  margin: 0;
  border: 2px solid var(--steel);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  gap: 16px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-eco-figure {
  position: relative;
  aspect-ratio: 4 / 3;
  border: 2px solid var(--steel);
  background:
    radial-gradient(circle at 50% 50%, rgba(36, 224, 255, 0.16), transparent 62%),
    repeating-linear-gradient(90deg, rgba(46, 82, 122, 0.35) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(0deg, rgba(46, 82, 122, 0.28) 0 1px, transparent 1px 34px),
    var(--panel);
  overflow: hidden;
}

.page-about .about-eco-figure::before,
.page-about .about-eco-figure::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid rgba(36, 224, 255, 0.35);
}

.page-about .about-eco-figure::before {
  width: 54%;
  aspect-ratio: 1;
}

.page-about .about-eco-figure::after {
  width: 84%;
  aspect-ratio: 1;
  border-color: rgba(46, 82, 122, 0.85);
}

.page-about .eco-core {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 46px;
  height: 46px;
  transform: translate(-50%, -50%) rotate(45deg);
  border: 2px solid var(--orange);
  background: rgba(255, 122, 26, 0.16);
}

.page-about .eco-node {
  position: absolute;
  width: 12px;
  height: 12px;
  background: var(--cyan);
  box-shadow: 0 0 0 2px var(--ink), 0 0 0 3px var(--cyan);
}

.page-about .eco-node--a {
  left: 24%;
  top: 30%;
}

.page-about .eco-node--b {
  left: 70%;
  top: 26%;
}

.page-about .eco-node--c {
  left: 44%;
  top: 70%;
}

.page-about .about-eco-stats {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 2px solid var(--steel);
  background: rgba(11, 34, 61, 0.72);
}

.page-about .about-eco-stat {
  padding: 16px 18px;
  border-bottom: 1px solid var(--about-green-line);
}

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

.page-about .about-eco-stat--accent {
  background: rgba(255, 122, 26, 0.08);
  box-shadow: inset 3px 0 0 var(--orange);
}

.page-about .about-eco-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 30px);
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-eco-stat--accent .about-eco-num {
  color: var(--orange);
}

.page-about .about-eco-stat h3 {
  margin: 4px 0 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-eco-stat p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-tagcloud {
  margin: 18px 0 0;
}

/* ---------- 数据协作 ---------- */
.page-about .about-phases {
  display: grid;
  gap: 14px;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-phase {
  position: relative;
  border: 2px solid var(--steel);
  border-top: 3px solid var(--cyan);
  background: var(--panel);
  padding: 20px;
}

.page-about .about-phase-num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-phase h3 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1;
  color: var(--white);
}

.page-about .about-phase p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-cadence {
  position: relative;
  border: 2px solid var(--steel);
  background: linear-gradient(180deg, rgba(11, 34, 61, 0.9), rgba(6, 20, 38, 0.96));
  padding-bottom: clamp(22px, 4vw, 38px);
  scroll-margin-top: 96px;
}

.page-about .about-cadence-media {
  margin: 0;
  overflow: hidden;
}

.page-about .about-cadence-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  filter: brightness(0.68) saturate(0.82);
}

.page-about .about-cadence-copy {
  position: relative;
  margin: -44px clamp(12px, 3vw, 34px) 0;
  border: 2px solid var(--steel);
  background: rgba(6, 20, 38, 0.96);
  padding: clamp(18px, 3vw, 32px);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cadence-copy h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.12;
  color: var(--white);
}

.page-about .about-cadence-copy > p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-cadence-facts {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-fact {
  border: 1px solid var(--about-green-line);
  border-left: 3px solid var(--teal);
  background: rgba(18, 52, 90, 0.55);
  padding: 10px 12px;
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 22px;
  color: var(--cyan);
}

.page-about .about-fact-label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--mist);
}

.page-about .about-cadence-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 20px;
}

.page-about .about-cadence-links a {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 255, 0.45);
  padding-bottom: 2px;
  transition: color var(--about-speed), border-color var(--about-speed);
}

.page-about .about-cadence-links a:hover {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border: 2px solid var(--steel);
  border-top: 4px solid var(--orange);
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(255, 122, 26, 0.14), transparent 60%),
    var(--raised);
  padding: clamp(22px, 4vw, 40px);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-cta p {
  max-width: 62ch;
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(234, 246, 255, 0.82);
}

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

/* ---------- 自适应 ---------- */
@media (min-width: 560px) {
  .page-about .about-metrics-hero {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .about-phases {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-phase:nth-child(2) {
    margin-top: 22px;
  }

  .page-about .about-phase:nth-child(3) {
    margin-top: 44px;
  }

  .page-about .about-tl-item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
    padding: 24px 22px 24px 28px;
  }

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

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

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

  .page-about .about-team-lead,
  .page-about .about-team-media {
    grid-column: 1 / -1;
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 92px;
  }

  .page-about .about-index-list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index-list a {
    border: 0;
    border-left: 2px solid transparent;
    padding: 8px 10px;
  }

  .page-about .about-index-list a:hover {
    border-left-color: var(--cyan);
    background: rgba(36, 224, 255, 0.08);
  }
}

@media (min-width: 1020px) {
  .page-about .about-eco {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: stretch;
  }

  .page-about .about-eco-figure {
    aspect-ratio: auto;
    min-height: 320px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .btn,
  .page-about .about-tl-item,
  .page-about .about-team-card,
  .page-about .about-index-list a,
  .page-about .about-cadence-links a {
    transition: none;
  }

  .page-about .btn:hover,
  .page-about .about-tl-item:hover,
  .page-about .about-team-card:hover,
  .page-about .about-tl-item:focus-within,
  .page-about .about-team-card:focus-within {
    transform: none;
  }
}