.page-about {
  --about-y: clamp(64px, 9vw, 132px);
  --about-line: rgba(199, 210, 229, 0.16);
  --about-ink-soft: #33415c;

  display: block;
  background-color: var(--c-deep);
  color: var(--c-paper);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.82;
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about p {
  margin: 0;
}

.page-about ol,
.page-about ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .section {
  padding-top: var(--about-y);
  padding-bottom: var(--about-y);
}

.page-about .display-1 {
  font-size: clamp(38px, 7.2vw, 92px);
  line-height: 1.06;
}

.page-about .display-2 {
  font-size: clamp(28px, 4.4vw, 56px);
  line-height: 1.1;
}

.page-about .display-3 {
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.16;
}

.page-about .eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-neon);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: min(88vh, 880px);
  padding-top: calc(var(--header-h) + clamp(56px, 9vw, 140px));
  padding-bottom: clamp(48px, 7vw, 104px);
  overflow: hidden;
}

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

.page-about .about-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 62%;
  opacity: 0.5;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(180deg, rgba(10, 22, 51, 0.9) 0%, rgba(10, 22, 51, 0.32) 34%, rgba(10, 22, 51, 0.88) 76%, var(--c-deep) 100%),
    linear-gradient(100deg, rgba(10, 22, 51, 0.92) 0%, rgba(10, 22, 51, 0.18) 70%);
}

.page-about .about-orbit {
  position: absolute;
  top: 16%;
  right: clamp(-70px, 2vw, 60px);
  width: clamp(150px, 24vw, 320px);
  aspect-ratio: 1 / 1;
  border: 1px dashed var(--neon-35);
  border-radius: 50%;
  pointer-events: none;
  animation: about-orbit-spin 20s linear infinite;
}

.page-about .about-orbit::before {
  content: "";
  position: absolute;
  inset: 18%;
  border: 1px solid var(--neon-18);
  border-radius: 50%;
}

.page-about .about-orbit::after {
  content: "";
  position: absolute;
  top: -5px;
  left: 50%;
  width: 9px;
  height: 9px;
  margin-left: -4.5px;
  border-radius: 50%;
  background-color: var(--c-amber);
  box-shadow: 0 0 14px rgba(255, 138, 61, 0.85);
}

@keyframes about-orbit-spin {
  to { transform: rotate(360deg); }
}

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

.page-about .about-crumbs {
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .about-crumbs .crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--paper-55);
}

.page-about .about-crumbs .crumbs-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--neon-35);
}

.page-about .about-crumbs a {
  color: var(--paper-55);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--c-neon);
  border-bottom-color: var(--c-neon);
}

.page-about .about-hero-title {
  max-width: 880px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero-title-accent {
  color: var(--c-neon);
}

.page-about .about-hero-lede {
  max-width: 640px;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.86;
  color: var(--paper-80);
}

/* ---------- 缘起 ---------- */

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 5vw, 64px);
  align-items: start;
}

.page-about .about-origin-title {
  margin: 12px 0 clamp(20px, 3vw, 30px);
  max-width: 18ch;
}

.page-about .about-prose {
  display: grid;
  gap: 18px;
  max-width: 62ch;
  color: var(--paper-80);
}

.page-about .about-prose p {
  line-height: 1.86;
}

.page-about .about-origin-aside {
  display: grid;
  gap: 18px;
  padding-top: 26px;
  border-top: 1px solid var(--about-line);
  justify-items: start;
}

.page-about .about-quote {
  padding-left: 16px;
  border-left: 3px solid var(--c-neon);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.55;
  color: var(--c-paper);
}

.page-about .about-aside-text {
  font-size: var(--fs-14);
  line-height: 1.88;
  color: var(--paper-60);
}

.page-about .about-inline-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.04em;
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid var(--neon-35);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-inline-link::after {
  content: "\2192";
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--c-amber);
  border-bottom-color: var(--c-amber);
}

/* ---------- 版本演进 ---------- */

.page-about .about-road {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background-color: var(--c-night);
}

.page-about .about-road-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-road-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
}

.page-about .about-road::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: linear-gradient(180deg, var(--c-deep) 0%, rgba(10, 22, 51, 0.5) 28%, rgba(19, 36, 71, 0.62) 72%, var(--c-deep) 100%);
}

.page-about .about-road-inner {
  position: relative;
}

.page-about .about-road-head {
  position: relative;
  max-width: 760px;
  margin-bottom: clamp(40px, 6vw, 76px);
}

.page-about .about-road-lede {
  margin-top: 18px;
  font-size: clamp(16px, 1.8vw, 18px);
  color: var(--paper-60);
  max-width: 46ch;
}

.page-about .about-watermark {
  position: absolute;
  top: -38%;
  right: -6%;
  font-family: var(--font-mono);
  font-size: clamp(110px, 20vw, 240px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--c-paper);
  opacity: 0.08;
  pointer-events: none;
  user-select: none;
}

.page-about .about-timeline {
  position: relative;
  padding-top: 4px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background-image: linear-gradient(180deg, var(--c-neon) 0%, rgba(167, 139, 250, 0.5) 46%, rgba(199, 210, 229, 0.14) 100%);
}

.page-about .about-node {
  position: relative;
  padding: 0 0 30px 40px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  box-sizing: border-box;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background-color: var(--c-night);
  border: 2px solid var(--c-violet);
}

.page-about .about-node--current::before {
  border-color: var(--c-amber);
  box-shadow: 0 0 0 5px rgba(255, 138, 61, 0.14);
}

.page-about .about-ver-num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-neon);
}

.page-about .about-node--current .about-ver-num {
  color: var(--c-amber);
}

.page-about .about-node-title {
  margin-bottom: 8px;
  font-size: var(--fs-20);
  color: var(--c-paper);
}

.page-about .about-node-body p {
  max-width: 58ch;
  font-size: var(--fs-16);
  line-height: 1.82;
  color: var(--paper-60);
}

.page-about .about-road-foot {
  margin-top: clamp(34px, 5vw, 58px);
  padding-top: 24px;
  border-top: 1px solid var(--about-line);
  max-width: 60ch;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--paper-60);
}

.page-about .about-road-foot a {
  color: var(--c-neon);
  text-decoration: none;
  border-bottom: 1px solid var(--neon-35);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-road-foot a:hover,
.page-about .about-road-foot a:focus-visible {
  color: var(--c-amber);
  border-bottom-color: var(--c-amber);
}

/* ---------- 三大栏目 ---------- */

.page-about .about-pillars-head {
  max-width: 640px;
  margin-bottom: clamp(34px, 5vw, 60px);
}

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

.page-about .about-pillar {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(24px, 3vw, 36px);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background-image: linear-gradient(160deg, rgba(19, 36, 71, 0.92) 0%, rgba(10, 22, 51, 0.72) 100%);
}

.page-about .about-pillar::after {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 22px;
  height: 22px;
  border-top: 2px solid var(--c-neon);
  border-left: 2px solid var(--c-neon);
  border-radius: var(--radius) 0 0 0;
  opacity: 0.65;
}

.page-about .about-pillar--lead {
  border-color: rgba(53, 230, 210, 0.28);
}

.page-about .about-pillar--lead::after {
  border-color: var(--c-amber);
  opacity: 1;
}

.page-about .about-pillar-index {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-neon);
}

.page-about .about-pillar-title {
  font-size: clamp(22px, 2.6vw, 28px);
  color: var(--c-paper);
}

.page-about .about-pillar-desc {
  flex: 1;
  font-size: var(--fs-16);
  line-height: 1.84;
  color: var(--paper-60);
}

.page-about .about-pillar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 4px;
}

.page-about .about-pillar-tags .tag {
  padding: 4px 11px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  line-height: 1.5;
  color: var(--c-neon);
  border: 1px solid currentColor;
  border-radius: 999px;
  opacity: 0.9;
}

.page-about .about-pillar-tags .tag--amber {
  color: var(--c-amber);
}

.page-about .about-pillar-tags .tag--mint {
  color: var(--c-mint);
}

/* ---------- 团队与节奏（纸白区） ---------- */

.page-about .about-team,
.page-about .about-loop,
.page-about .about-next {
  background-color: var(--c-paper);
  color: var(--c-ink);
}

.page-about .about-team .eyebrow,
.page-about .about-loop .eyebrow,
.page-about .about-next .eyebrow {
  color: var(--c-neon-ink);
}

.page-about .about-team-head {
  max-width: 760px;
  margin-bottom: clamp(34px, 5vw, 64px);
}

.page-about .about-team-lede {
  margin-top: 18px;
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.86;
  color: var(--about-ink-soft);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  align-items: start;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: clamp(28px, 4vw, 42px);
  border: 1px solid var(--c-rule);
  background-color: var(--c-rule);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(18px, 2.4vw, 26px);
  background-color: var(--c-paper);
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}

.page-about .about-stat-num em {
  margin-left: 2px;
  font-style: normal;
  font-size: 0.6em;
  color: var(--c-amber);
}

.page-about .about-stat-label {
  font-size: var(--fs-14);
  line-height: 1.62;
  color: var(--c-muted);
}

.page-about .about-prose--ink {
  color: var(--about-ink-soft);
}

.page-about .about-team-fig {
  position: relative;
  margin: 0;
  padding: 10px;
  border: 1px solid var(--c-rule);
  border-radius: var(--radius);
  background-color: #e7ecf6;
  background-image:
    linear-gradient(rgba(199, 210, 229, 0.6) 1px, transparent 1px),
    linear-gradient(90deg, rgba(199, 210, 229, 0.6) 1px, transparent 1px);
  background-size: 32px 32px;
}

.page-about .about-team-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 2px;
}

.page-about .about-team .figure-caption {
  margin-top: 12px;
  padding: 0 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

/* ---------- 反馈循环 ---------- */

.page-about .about-loop {
  border-top: 1px solid var(--c-rule);
}

.page-about .about-loop-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 5vw, 64px);
  align-items: start;
}

.page-about .about-loop-lede {
  margin-top: 18px;
  max-width: 42ch;
  font-size: var(--fs-16);
  line-height: 1.86;
  color: var(--about-ink-soft);
}

.page-about .about-steps {
  display: grid;
  gap: 0;
  counter-reset: about-step;
}

.page-about .about-step {
  position: relative;
  padding: 0 0 26px 54px;
  counter-increment: about-step;
}

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

.page-about .about-step::before {
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-ink);
  background-color: #ffffff;
  border: 1px solid var(--c-rule);
  border-radius: 50%;
}

.page-about .about-step::after {
  content: "";
  position: absolute;
  left: 17px;
  top: 42px;
  bottom: 4px;
  width: 1px;
  background-color: var(--c-rule);
}

.page-about .about-step:last-child::after {
  display: none;
}

.page-about .about-step-title {
  margin-bottom: 8px;
  font-size: var(--fs-20);
  color: var(--c-ink);
}

.page-about .about-step p {
  max-width: 54ch;
  font-size: var(--fs-16);
  line-height: 1.82;
  color: var(--about-ink-soft);
}

/* ---------- 接下来 ---------- */

.page-about .about-next {
  border-top: 1px solid var(--c-rule);
}

.page-about .about-next-head {
  max-width: 620px;
}

.page-about .about-next-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(28px, 4vw, 48px);
  border: 1px solid var(--c-rule);
  background-color: var(--c-rule);
}

.page-about .about-next-item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(22px, 3vw, 34px);
  background-color: var(--c-paper);
}

.page-about .about-next-idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--c-muted);
}

.page-about .about-next-item h3 {
  font-size: var(--fs-20);
  color: var(--c-ink);
}

.page-about .about-next-item p {
  font-size: var(--fs-16);
  line-height: 1.82;
  color: var(--about-ink-soft);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background-color: var(--c-deep);
  color: var(--c-paper);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 84% 18%, rgba(53, 230, 210, 0.18) 0%, rgba(53, 230, 210, 0) 46%),
    radial-gradient(circle at 6% 88%, rgba(255, 138, 61, 0.15) 0%, rgba(255, 138, 61, 0) 44%);
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: center;
}

.page-about .about-cta-text .display-3 {
  margin: 12px 0 16px;
}

.page-about .about-cta-text p {
  max-width: 56ch;
  font-size: var(--fs-16);
  line-height: 1.86;
  color: var(--paper-60);
}

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

.page-about .about-cta-actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 26px;
  font-family: var(--font-body);
  font-size: var(--fs-16);
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-cta-actions .btn-primary {
  background-color: var(--c-amber);
  color: var(--c-ink);
}

.page-about .about-cta-actions .btn-primary:hover,
.page-about .about-cta-actions .btn-primary:focus-visible {
  background-color: #ffa163;
  transform: translateY(-2px);
}

.page-about .about-cta-actions .btn-outline {
  color: var(--c-neon);
  border-color: var(--neon-35);
  background-color: transparent;
}

.page-about .about-cta-actions .btn-outline:hover,
.page-about .about-cta-actions .btn-outline:focus-visible {
  border-color: var(--c-neon);
  background-color: var(--neon-08);
}

.page-about .about-cta-actions .btn-ghost {
  color: var(--paper-60);
  border-color: var(--about-line);
  background-color: transparent;
}

.page-about .about-cta-actions .btn-ghost:hover,
.page-about .about-cta-actions .btn-ghost:focus-visible {
  color: var(--c-paper);
  border-color: var(--paper-55);
}

/* ---------- 滚动显现（纯 CSS，无脚本时完整可见） ---------- */

.page-about .about-reveal {
  opacity: 1;
}

@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .page-about .about-reveal {
      animation: about-rise linear both;
      animation-timeline: view();
      animation-range: entry 0% cover 26%;
    }
  }
}

@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 响应式 ---------- */

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

@media (min-width: 880px) {
  .page-about .about-timeline::before {
    left: 156px;
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 0 40px;
    padding: 0 0 44px 0;
  }

  .page-about .about-node::before {
    left: 149px;
    top: 8px;
  }

  .page-about .about-node .about-ver-num {
    margin-bottom: 0;
    padding-top: 2px;
    font-size: var(--fs-28);
    text-align: right;
    white-space: nowrap;
  }

  .page-about .about-node .about-node-title {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-pillars-grid {
    grid-template-columns: 1.4fr 1fr 1.1fr;
    gap: 22px;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(40px, 6vw, 80px);
  }

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

@media (min-width: 960px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(48px, 6vw, 96px);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-loop-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(40px, 6vw, 80px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-orbit {
    animation: none;
  }

  .page-about .about-reveal {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}