.page-about {
  --about-panel: linear-gradient(158deg, rgba(22, 36, 58, .92), rgba(16, 27, 45, .7));
  --about-glow-green: rgba(0, 196, 106, .22);
  --about-glow-cyan: rgba(88, 246, 232, .15);
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: clamp(40px, 8vw, 104px) 0 clamp(36px, 6vw, 76px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 620px;
  background:
    radial-gradient(58% 78% at 14% 4%, var(--about-glow-green), transparent 70%),
    radial-gradient(48% 66% at 86% 12%, var(--about-glow-cyan), transparent 74%);
  pointer-events: none;
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(234, 246, 242, .035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(234, 246, 242, .035) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: radial-gradient(72% 62% at 46% 28%, #000, transparent 78%);
  mask-image: radial-gradient(72% 62% at 46% 28%, #000, transparent 78%);
  pointer-events: none;
}

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

.page-about .about-title {
  margin: 16px 0 0;
  font-family: var(--font-sans);
  font-weight: 200;
  font-size: clamp(2.1rem, 6.2vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: .08em;
  color: var(--cold);
}

.page-about .about-lede {
  max-width: 64ch;
  margin: 22px 0 0;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-jump a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--cold);
  text-decoration: none;
  transition: border-color .32s var(--ease), background .32s var(--ease), color .32s var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  border-color: var(--line-cyan);
  background: rgba(88, 246, 232, .08);
  color: var(--cyan);
}

.page-about .about-jump__n {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--green);
}

/* ---------- 章节节奏 ---------- */
.page-about .about-sec {
  padding-block: clamp(56px, 9vw, 110px);
}

.page-about .about-sec + .about-sec,
.page-about .about-cover + .about-sec {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec--last {
  padding-bottom: clamp(64px, 10vw, 130px);
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(28px, 5vw, 54px);
}

.page-about .about-head__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .22em;
  color: var(--green);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(1.55rem, 3.6vw, 2.55rem);
  line-height: 1.22;
  letter-spacing: .05em;
  color: var(--cold);
}

.page-about .about-head__text {
  max-width: 68ch;
  margin: 4px 0 0;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(30px, 5vw, 52px);
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--stand);
}

.page-about .about-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure .media__cap {
  padding: 14px clamp(16px, 3vw, 26px);
  font-size: .85rem;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 起点三块 ---------- */
.page-about .about-trio {
  display: grid;
  gap: 16px;
}

.page-about .about-trio__item {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--about-panel);
  transition: border-color .32s var(--ease), transform .32s var(--ease);
}

.page-about .about-trio__item:hover {
  border-color: var(--line-cyan);
  transform: translateY(-3px);
}

.page-about .about-trio__title {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--cold);
}

.page-about .about-trio__title::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 2px;
  margin-right: 10px;
  vertical-align: middle;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--green), var(--cyan));
}

.page-about .about-trio__text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 团队卡片 ---------- */
.page-about .crew-grid {
  display: grid;
  gap: 16px;
}

.page-about .crew-card {
  background: var(--about-panel);
  border-radius: var(--r-lg);
  transition: border-color .32s var(--ease), transform .32s var(--ease), background .32s var(--ease);
}

.page-about .crew-card:hover {
  border-color: var(--line-cyan);
  transform: translateY(-4px);
}

.page-about .crew-card .card__title {
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--cold);
}

.page-about .crew-card .card__body {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .crew-card .card__meta {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: .82rem;
  line-height: 1.7;
  color: rgba(148, 163, 168, .86);
}

/* ---------- V4 时间线 ---------- */
.page-about .v4-track {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .v4-track::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--green), var(--cyan));
  opacity: .45;
}

.page-about .v4-step {
  position: relative;
  padding: 0 0 clamp(24px, 4vw, 40px) 42px;
}

.page-about .v4-step:last-child {
  padding-bottom: 0;
}

.page-about .v4-step__dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--green);
  box-shadow: 0 0 0 4px rgba(0, 196, 106, .12);
  transition: box-shadow .32s var(--ease), border-color .32s var(--ease);
}

.page-about .v4-step:hover .v4-step__dot {
  border-color: var(--cyan);
  box-shadow: 0 0 0 7px rgba(88, 246, 232, .14);
}

.page-about .v4-step__card {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--about-panel);
  transition: border-color .32s var(--ease), transform .32s var(--ease);
}

.page-about .v4-step__card:hover {
  border-color: var(--line-cyan);
  transform: translateY(-3px);
}

.page-about .v4-step__stage {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .v4-step__title {
  margin: 0 0 10px;
  font-size: 1.08rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--cold);
}

.page-about .v4-step__text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--mist);
}

.page-about .about-tail {
  margin: clamp(26px, 4vw, 40px) 0 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-tail a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(88, 246, 232, .4);
  transition: border-color .3s var(--ease), color .3s var(--ease);
}

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

/* ---------- 规模数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .about-stat {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--about-panel);
  position: relative;
  overflow: hidden;
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--green), var(--cyan), transparent);
  opacity: .7;
}

.page-about .about-stat__num {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: .02em;
}

.page-about .about-stat__unit {
  font-family: var(--font-sans);
  font-size: .9rem;
  font-weight: 400;
  color: var(--cold);
  letter-spacing: .04em;
}

.page-about .about-stat__label {
  margin: 12px 0 0;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-scene {
  display: grid;
  gap: 16px;
}

.page-about .about-scene__card {
  padding: clamp(20px, 3.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--about-panel);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color .32s var(--ease), transform .32s var(--ease);
}

.page-about .about-scene__card:hover {
  border-color: var(--line-cyan);
  transform: translateY(-3px);
}

.page-about .about-scene__title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--cold);
}

.page-about .about-scene__text {
  margin: 0;
  flex: 1;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--mist);
}

.page-about .about-scene__card .btn {
  align-self: flex-start;
}

/* ---------- 生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 16px;
  margin-bottom: clamp(30px, 5vw, 50px);
}

.page-about .eco-card {
  padding: clamp(20px, 3.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--about-panel);
  transition: border-color .32s var(--ease), transform .32s var(--ease);
}

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

.page-about .eco-card__title {
  margin: 14px 0 10px;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--cold);
  font-family: var(--font-mono);
}

.page-about .eco-card__text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--mist);
}

.page-about .about-cadence {
  padding: clamp(22px, 4vw, 36px);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    linear-gradient(120deg, rgba(14, 122, 74, .16), rgba(7, 11, 18, 0) 62%),
    var(--stand);
}

.page-about .about-cadence__title {
  margin: 0 0 16px;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: .05em;
  color: var(--cold);
}

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

.page-about .about-cadence__list li {
  position: relative;
  padding-left: 18px;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-cadence__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
}

.page-about .about-cadence__list .num {
  color: var(--cyan);
  font-weight: 700;
}

/* ---------- 承诺 ---------- */
.page-about .promise-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .promise-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  border-radius: var(--r-lg);
  background: var(--about-panel);
  transition: border-color .32s var(--ease), transform .32s var(--ease);
}

.page-about .promise-item:hover {
  border-left-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .promise-item__num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--green);
  letter-spacing: .04em;
  line-height: 1.4;
}

.page-about .promise-item__title {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--cold);
}

.page-about .promise-item__text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.88;
  color: var(--mist);
  word-break: break-word;
}

.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 50px);
  padding: clamp(24px, 4vw, 38px);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    radial-gradient(70% 130% at 8% 0%, rgba(255, 90, 54, .14), transparent 68%),
    radial-gradient(60% 120% at 96% 100%, rgba(88, 246, 232, .12), transparent 70%),
    var(--stand);
  display: grid;
  gap: 18px;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--cold);
}

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

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-trio,
  .page-about .crew-grid,
  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-trio {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .crew-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

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

  .page-about .about-scene {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-lede,
  .page-about .about-head__text {
    font-size: 1.05rem;
  }

  .page-about .v4-step {
    padding-left: 52px;
  }

  .page-about .v4-track::before {
    left: 11px;
  }

  .page-about .v4-step__dot {
    width: 24px;
    height: 24px;
    top: 10px;
  }

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

/* ---------- 大屏 ---------- */
@media (min-width: 1440px) {
  .page-about .about-title {
    max-width: 20ch;
  }

  .page-about .about-lede {
    max-width: 56ch;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump a,
  .page-about .about-trio__item,
  .page-about .crew-card,
  .page-about .v4-step__card,
  .page-about .v4-step__dot,
  .page-about .about-scene__card,
  .page-about .eco-card,
  .page-about .promise-item,
  .page-about .about-tail a {
    transition: none;
  }
}
</main>