.page-about {
  background: var(--pitch);
  color: var(--white);
  position: relative;
  overflow-x: clip;
}

.page-about .about-kicker {
  margin: 0 0 1rem;
  color: var(--heat);
  letter-spacing: 0.14em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2rem, 6vw, 4rem) 0 clamp(2.25rem, 5vw, 3.5rem);
}

.page-about .about-hero::after {
  content: "2019";
  position: absolute;
  top: 0.25rem;
  right: -0.04em;
  z-index: 0;
  font-family: var(--font-mono);
  font-size: clamp(5.5rem, 25vw, 15rem);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(28, 92, 66, 0.85);
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  margin: 0 0 1.15rem;
  max-width: 15em;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.4vw, 4.2rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: var(--white);
}

.page-about .about-lead {
  max-width: 42em;
  margin: 0;
  font-size: clamp(0.975rem, 1.6vw, 1.125rem);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(1.75rem, 4.5vw, 2.75rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats > li {
  background: var(--stand);
  padding: 1rem 0.95rem 1.05rem;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.6vw, 2.15rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--heat);
}

.page-about .stat-num small {
  margin-left: 0.1em;
  font-size: 0.52em;
  color: var(--signal);
}

.page-about .stat-label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.8125rem;
  letter-spacing: 0.07em;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */

.page-about .section-head {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  margin: 0 0 clamp(1.25rem, 3vw, 1.9rem);
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--line);
}

.page-about .section-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--heat);
}

.page-about .section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3.4vw, 2.05rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-intro {
  margin: 0 0 clamp(1.5rem, 3.5vw, 2.25rem);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 2.25rem;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--heat) 0%, var(--line) 62%, rgba(28, 92, 66, 0) 100%);
}

.page-about .timeline > li {
  position: relative;
  padding-bottom: 1.9rem;
}

.page-about .timeline > li:last-child {
  padding-bottom: 0;
}

.page-about .timeline > li::before {
  content: "";
  position: absolute;
  left: -2.25rem;
  top: 0.4rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--pitch);
  border: 2px solid var(--heat);
  box-shadow: 0 0 0 4px rgba(255, 94, 26, 0.12);
}

.page-about .t-year {
  display: inline-block;
  margin-bottom: 0.5rem;
  padding: 0.14rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  color: var(--heat);
  border: 1px solid rgba(255, 94, 26, 0.55);
  background: rgba(255, 94, 26, 0.07);
}

.page-about .timeline h3 {
  margin: 0 0 0.4rem;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .timeline p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 图片容器 ---------- */

.page-about .media-frame {
  position: relative;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  border: 1px solid var(--line);
  background: var(--stand);
  overflow: hidden;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .media-frame figcaption {
  margin: 0;
  padding: 0.7rem 0.9rem;
  border-top: 1px solid var(--line);
  background: var(--ink);
  color: var(--mist);
}

/* ---------- 团队 ---------- */

.page-about .crew {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .crew-photo {
  margin: 0;
}

.page-about .crew-photo img {
  aspect-ratio: 4 / 5;
}

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

.page-about .crew-list > li {
  display: grid;
  grid-template-columns: 2.35rem minmax(0, 1fr);
  gap: 0 0.9rem;
  padding: 1.05rem 0;
  border-top: 1px solid var(--line);
}

.page-about .crew-list > li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .crew-idx {
  padding-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--heat);
}

.page-about .crew-name {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .crew-list p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 合作网络 ---------- */

.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner-card {
  position: relative;
  padding: clamp(1.2rem, 3vw, 1.9rem);
  background: var(--stand);
  overflow: hidden;
}

.page-about .partner-card::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 28px;
  height: 28px;
  background: var(--heat);
  opacity: 0.85;
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.page-about .partner-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.3rem, 6vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--heat);
}

.page-about .partner-card h3 {
  margin: 0.4rem 0 0.7rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 覆盖与荣誉 ---------- */

.page-about .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1rem, 3vw, 1.5rem);
}

.page-about .reach-panel {
  position: relative;
  padding: clamp(1.3rem, 3.2vw, 2rem);
  background: var(--stand);
  border: var(--edge) solid var(--line);
}

.page-about .reach-panel--honor {
  background: linear-gradient(160deg, rgba(255, 94, 26, 0.14) 0%, rgba(15, 58, 42, 0.9) 62%);
  border-color: rgba(255, 94, 26, 0.5);
}

.page-about .reach-kicker {
  margin: 0 0 0.9rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .reach-big {
  margin: 0 0 0.8rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .reach-big .num {
  margin-right: 0.15em;
  font-family: var(--font-mono);
  font-size: 2.35rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--heat);
  vertical-align: -0.08em;
}

.page-about .reach-text {
  margin: 0;
  font-size: 0.9125rem;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 版本节奏 ---------- */

.page-about .cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
  align-items: start;
}

.page-about .cadence-main p {
  margin: 0 0 1rem;
  font-size: 0.975rem;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .cadence-side {
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--heat);
  background: var(--stand);
}

.page-about .cadence-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--heat);
}

.page-about .cadence-label {
  margin: 0.4rem 0 0;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--white);
}

.page-about .cadence-note {
  margin: 0.55rem 0 0;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--line);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding: clamp(2rem, 5vw, 3.25rem) 0 clamp(2.5rem, 6vw, 4rem);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(4, 17, 11, 0.55) 0%, rgba(10, 42, 31, 0) 100%);
}

.page-about .about-cta h2 {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3.4vw, 2rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--white);
}

.page-about .about-cta p {
  max-width: 44em;
  margin: 0 0 1.4rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 820px) {
  .page-about .about-hero::after {
    top: 0.5rem;
  }

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

  .page-about .cadence {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.75fr);
  }
}

@media (min-width: 960px) {
  .page-about .crew {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .crew-photo img {
    aspect-ratio: 3 / 4;
  }

  .page-about .timeline {
    padding-left: 3rem;
  }

  .page-about .timeline::before {
    left: 9px;
  }

  .page-about .timeline > li::before {
    left: -3rem;
    width: 18px;
    height: 18px;
    top: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .media-frame img {
    filter: none;
  }
}