.page-about {
  --about-section-pad: clamp(2.6rem, 7vw, 4.8rem);
  position: relative;
  background:
    linear-gradient(180deg, rgba(30, 42, 120, 0.26) 0%, rgba(11, 16, 38, 0) 26%),
    var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: clip;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(2rem, 5.5vw, 3.6rem) 0 clamp(2.2rem, 6vw, 4rem);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(700px, 82vw);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 34% 34%, rgba(25, 247, 200, 0.17), transparent 60%),
    radial-gradient(circle at 72% 66%, rgba(255, 107, 44, 0.14), transparent 58%);
  transform: rotate(16deg);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 2;
}

.page-about .crumb-sep {
  margin: 0 0.45rem;
  color: var(--dim);
}

.page-about .hero-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.6rem, 4.5vw, 3rem);
  margin-top: 1.4rem;
}

.page-about .hero-note {
  display: inline-block;
  color: var(--neon);
  transform: rotate(-1.8deg);
  transform-origin: left center;
}

.page-about .hero-title {
  margin: 0.7rem 0 0;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(2rem, 6.6vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--paper);
}

.page-about .hero-sub {
  margin: 1.1rem 0 0;
  max-width: 48ch;
  font-size: clamp(0.94rem, 2.3vw, 1.05rem);
  line-height: 1.9;
  color: var(--text);
}

.page-about .hero-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  align-self: end;
}

.page-about .hero-board-cell {
  background: linear-gradient(160deg, rgba(30, 42, 120, 0.6), rgba(17, 24, 39, 0.92));
  padding: 1rem 0.85rem 1.05rem;
}

.page-about .hero-board-cell:last-child {
  background: linear-gradient(160deg, rgba(255, 107, 44, 0.18), rgba(17, 24, 39, 0.94));
}

.page-about .hero-board-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.45rem, 4.6vw, 2.05rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--neon);
}

.page-about .hero-board-cell:last-child .hero-board-num {
  color: var(--orange);
}

.page-about .hero-board-label {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.76rem;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  position: relative;
  padding: var(--about-section-pad) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 0.5rem 1rem;
  margin-bottom: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .about-head-main {
  min-width: 0;
}

.page-about .about-index {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.6vw, 2.2rem);
  line-height: 1;
  color: var(--indigo);
  text-shadow: 0 0 0 var(--neon);
}

.page-about .about-head .section-title {
  margin: 0.3rem 0 0;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(1.4rem, 4.4vw, 2.2rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-note {
  grid-column: 1 / -1;
  margin: 0.35rem 0 0;
  font-family: var(--font-num);
  font-size: 0.71rem;
  letter-spacing: 0.1em;
  color: var(--dim);
}

/* ---------- 品牌起点 ---------- */

.page-about .origin-figure {
  margin: 0 0 clamp(1.4rem, 4vw, 2.2rem);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .origin-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  max-width: 78ch;
}

.page-about .origin-body p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.92;
  color: var(--text);
}

.page-about .origin-lead {
  border-left: 3px solid var(--neon);
  padding-left: 1.05rem;
  color: var(--paper) !important;
  font-size: 1.06rem !important;
}

/* ---------- 追踪流程 ---------- */

.page-about .flow-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .flow-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

.page-about .flow-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.page-about .flow-step {
  display: grid;
  grid-template-columns: 1.2rem minmax(0, 1fr);
  gap: 1rem;
}

.page-about .flow-step + .flow-step {
  margin-top: 1.5rem;
}

.page-about .flow-mark {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .flow-mark::before {
  content: "";
  position: absolute;
  top: 1.2rem;
  bottom: -1.5rem;
  width: 2px;
  background: linear-gradient(180deg, rgba(25, 247, 200, 0.7), rgba(25, 247, 200, 0.06));
}

.page-about .flow-step:last-child .flow-mark::before {
  display: none;
}

.page-about .flow-dot {
  position: relative;
  z-index: 1;
  width: 0.78rem;
  height: 0.78rem;
  margin-top: 0.36rem;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(25, 247, 200, 0.14);
}

.page-about .flow-step:last-child .flow-dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 44, 0.18);
}

.page-about .flow-stage {
  margin: 0;
  font-family: var(--font-num);
  font-size: 0.73rem;
  letter-spacing: 0.12em;
  color: var(--neon);
}

.page-about .flow-step:last-child .flow-stage {
  color: var(--orange);
}

.page-about .flow-body h3 {
  margin: 0.32rem 0 0.45rem;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(1.04rem, 2.7vw, 1.2rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .flow-body p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--text);
}

/* ---------- 内容体系 ---------- */

.page-about .filter-bar {
  margin-bottom: 1.3rem;
  flex-wrap: wrap;
}

.page-about .column-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
}

.page-about .column-card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1.1rem 1rem 1.2rem;
  background: linear-gradient(165deg, rgba(17, 24, 39, 0.96), rgba(11, 16, 38, 0.9));
}

.page-about .column-card h3 {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .column-card p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .update-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  margin-top: 1.5rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  background: linear-gradient(115deg, rgba(30, 42, 120, 0.38), rgba(11, 16, 38, 0.65));
}

.page-about .update-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .update-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 1.45rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .update-label {
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 团队与运营 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .team-copy p {
  margin: 0 0 1rem;
  font-size: 0.97rem;
  line-height: 1.88;
  color: var(--text);
}

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

.page-about .stack-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.1rem;
}

.page-about .paper-card {
  position: relative;
  padding: 1.35rem 1.15rem 1.25rem;
  border: 1px solid rgba(244, 247, 255, 0.13);
  border-top: 3px solid var(--neon);
  border-radius: var(--radius);
  background:
    linear-gradient(168deg, rgba(244, 247, 255, 0.07), rgba(244, 247, 255, 0.012)),
    var(--panel);
}

.page-about .paper-card::after {
  content: "";
  position: absolute;
  top: -3px;
  left: 1.15rem;
  width: 3.2rem;
  height: 3px;
  background: var(--orange);
}

.page-about .paper-card h3 {
  margin: 0.6rem 0 0.45rem;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1rem;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .paper-card p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .term-strip {
  margin-top: clamp(1.4rem, 4vw, 2.2rem);
  padding: 1.1rem 1.15rem 1.2rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: rgba(139, 92, 246, 0.07);
}

.page-about .term-strip .eyebrow {
  color: var(--violet);
}

.page-about .term-cloud {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.85rem 0 0;
  padding: 0;
}

.page-about .term {
  position: relative;
  padding: 0.34rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(11, 16, 38, 0.72);
  font-family: var(--font-num);
  font-size: 0.77rem;
  color: var(--text);
  cursor: help;
}

.page-about .term:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

.page-about .term-def {
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  z-index: 5;
  width: max-content;
  max-width: min(220px, 68vw);
  padding: 0.5rem 0.62rem;
  border-radius: var(--radius);
  background: var(--indigo);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 0.74rem;
  line-height: 1.55;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.18s var(--ease), visibility 0.18s var(--ease);
  pointer-events: none;
}

.page-about .term:hover .term-def,
.page-about .term:focus .term-def {
  opacity: 1;
  visibility: visible;
}

/* ---------- 版本演进 ---------- */

.page-about .era-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 0.5rem;
  scroll-snap-type: x proximity;
}

.page-about .era-inner {
  min-width: 1120px;
}

.page-about .era-rail {
  margin-bottom: -1.1rem;
  padding: 0 0.6rem;
}

.page-about .era-rail svg {
  display: block;
  width: 100%;
  height: 12px;
}

.page-about .era-list {
  list-style: none;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 232px;
  gap: 1rem;
  margin: 0;
  padding: 0.9rem 0 0;
}

.page-about .era-item {
  scroll-snap-align: start;
  position: relative;
  padding: 1.15rem 1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(170deg, rgba(17, 24, 39, 0.94), rgba(11, 16, 38, 0.86));
}

.page-about .era-item::before {
  content: "";
  position: absolute;
  top: -0.95rem;
  left: 1.2rem;
  width: 0.62rem;
  height: 0.62rem;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--neon);
}

.page-about .era-item--current {
  border-color: rgba(255, 107, 44, 0.55);
  background: linear-gradient(170deg, rgba(255, 107, 44, 0.14), rgba(11, 16, 38, 0.9));
}

.page-about .era-item--current::before {
  border-color: var(--orange);
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 44, 0.18);
}

.page-about .era-tag {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--neon);
}

.page-about .era-item--current .era-tag {
  color: var(--orange);
}

.page-about .era-item h3 {
  margin: 0.5rem 0 0.45rem;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1rem;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .era-item p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .era-hint {
  margin: 0.9rem 0 0;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--dim);
}

/* ---------- 使用场景 ---------- */

.page-about .scene-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .scene {
  padding: 1.15rem 1.05rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(30, 42, 120, 0.32), rgba(11, 16, 38, 0.8));
}

.page-about .scene:nth-child(even) {
  background: linear-gradient(160deg, rgba(139, 92, 246, 0.14), rgba(11, 16, 38, 0.82));
}

.page-about .scene h3 {
  margin: 0.65rem 0 0.45rem;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.02rem;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .scene p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.8rem;
  margin-top: clamp(1.6rem, 4.5vw, 2.4rem);
  padding-top: clamp(1.4rem, 4vw, 2rem);
  border-top: 1px solid var(--line);
}

.page-about .nxt {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  background: rgba(17, 24, 39, 0.7);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .nxt:hover,
.page-about .nxt:focus-visible {
  transform: translateY(-2px);
  border-color: var(--neon);
}

.page-about .nxt-kicker {
  font-family: var(--font-num);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .nxt-title {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.45;
  color: var(--paper);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .update-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 820px) {
  .page-about .about-head {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-note {
    grid-column: auto;
    margin: 0;
    text-align: right;
    transform: rotate(-1.5deg);
    transform-origin: right center;
  }

  .page-about .flow-wrap {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .flow-figure {
    position: sticky;
    top: 5rem;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

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

@media (min-width: 920px) {
  .page-about .hero-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

@media (min-width: 1100px) {
  .page-about .origin-body {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.2rem 2.4rem;
  }

  .page-about .origin-body p:first-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 400px) {
  .page-about .hero-board {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .era-inner {
    min-width: 980px;
  }

  .page-about .era-list {
    grid-auto-columns: 196px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .nxt,
  .page-about .term-def {
    transition: none;
  }

  .page-about .nxt:hover,
  .page-about .nxt:focus-visible {
    transform: none;
  }
}