.page-about {
  --about-rail: 238px;
  display: block;
  color: var(--steel);
  font-family: var(--font-body);
  background:
    radial-gradient(110% 55% at 88% -6%, rgba(45, 226, 230, 0.13), transparent 62%),
    radial-gradient(85% 45% at -5% 26%, rgba(255, 107, 53, 0.08), transparent 68%),
    var(--ink-900);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 2.25rem 0 3.5rem;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan) 20%, rgba(45, 226, 230, 0.08) 64%, transparent);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 2rem;
  margin-top: 1.4rem;
}

.page-about h1 {
  margin: 0.7rem 0 1.1rem;
  font-family: var(--font-head);
  font-size: clamp(2.5rem, 8.4vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: 0.06em;
  color: var(--white);
  text-shadow: 0 0 46px rgba(45, 226, 230, 0.3);
}

.page-about .about-hero-copy .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero-lead {
  max-width: 50ch;
  margin: 0 0 1.7rem;
  font-size: 1.02rem;
  line-height: 1.88;
  color: rgba(215, 227, 244, 0.88);
}

.page-about .about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.3rem 2.4rem;
  margin: 0;
  padding: 1.25rem 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  min-width: 0;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 1.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .stat-label {
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: rgba(215, 227, 244, 0.6);
}

.page-about .about-hero-figure {
  margin: 0;
}

.page-about .about-hero-figure .figure-media {
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card), 0 0 70px -26px rgba(45, 226, 230, 0.55);
}

.page-about .about-hero-figure .figure-caption {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(215, 227, 244, 0.55);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  padding: 3rem 0 4.5rem;
}

.page-about .about-rail {
  padding: 1.3rem 1.1rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(16, 30, 56, 0.9), rgba(5, 10, 24, 0.62));
}

.page-about .rail-title {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .rail-list {
  display: grid;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .rail-list a {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.55rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--steel);
  text-decoration: none;
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  background: rgba(45, 226, 230, 0.1);
  color: var(--white);
  transform: translateX(3px);
}

.page-about .rail-no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-flow {
  display: grid;
  gap: 4.25rem;
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  min-width: 0;
}

.page-about .about-chapter::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2.1rem;
  height: 1px;
  background: linear-gradient(90deg, var(--line-cyan), transparent 58%);
  transform: rotate(-0.45deg);
  transform-origin: left center;
}

.page-about .about-chapter .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-chapter .section-title {
  max-width: 24ch;
  margin: 0.7rem 0 1.2rem;
  font-family: var(--font-head);
  font-size: clamp(1.55rem, 4.2vw, 2.45rem);
  line-height: 1.22;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-prose p {
  max-width: 68ch;
  margin: 0 0 1rem;
  font-size: 0.97rem;
  line-height: 1.9;
  color: rgba(215, 227, 244, 0.86);
}

.page-about .about-lede {
  max-width: 64ch;
  margin: 0;
  font-size: 0.99rem;
  line-height: 1.88;
  color: rgba(215, 227, 244, 0.84);
}

.page-about .about-note {
  max-width: 72ch;
  margin: 1.9rem 0 0;
  padding: 1rem 1.15rem;
  border-left: 2px solid var(--orange);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(255, 107, 53, 0.07);
  font-size: 0.89rem;
  line-height: 1.8;
  color: rgba(215, 227, 244, 0.86);
}

.page-about .about-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 01 对比 ---------- */

.page-about .about-contrast {
  display: grid;
  gap: 1rem;
  margin-top: 1.9rem;
}

.page-about .contrast-col {
  padding: 1.45rem 1.35rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
}

.page-about .contrast-col--old {
  background: rgba(23, 42, 74, 0.34);
}

.page-about .contrast-col--new {
  border-color: var(--line-cyan);
  background:
    linear-gradient(150deg, rgba(45, 226, 230, 0.14), rgba(255, 107, 53, 0.09) 82%),
    rgba(23, 42, 74, 0.55);
  box-shadow: 0 0 46px -28px rgba(45, 226, 230, 0.95);
}

.page-about .contrast-label {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-about .contrast-col--old .contrast-label {
  color: rgba(215, 227, 244, 0.48);
}

.page-about .contrast-col--new .contrast-label {
  color: var(--cyan-soft);
}

.page-about .contrast-col ul {
  display: grid;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .contrast-col li {
  position: relative;
  padding-left: 1.05rem;
  font-size: 0.93rem;
  line-height: 1.72;
}

.page-about .contrast-col--old li {
  color: rgba(215, 227, 244, 0.68);
}

.page-about .contrast-col--new li {
  color: rgba(215, 227, 244, 0.9);
}

.page-about .contrast-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
}

.page-about .contrast-col--old li::before {
  background: rgba(215, 227, 244, 0.32);
}

.page-about .contrast-col--new li::before {
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}

/* ---------- 02 节奏 ---------- */

.page-about .rhythm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: 1.05rem;
  margin-top: 1.9rem;
}

.page-about .rhythm-card {
  position: relative;
  padding: 1.5rem 1.3rem 1.4rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: linear-gradient(165deg, rgba(23, 42, 74, 0.72), rgba(10, 20, 40, 0.5));
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .rhythm-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  opacity: 0.72;
}

.page-about .rhythm-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-cyan);
  box-shadow: 0 22px 46px -32px rgba(45, 226, 230, 0.85);
}

.page-about .rhythm-freq {
  margin: 0 0 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.69rem;
  letter-spacing: 0.14em;
  color: var(--orange-soft);
}

.page-about .rhythm-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.01rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .rhythm-card p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.76;
  color: rgba(215, 227, 244, 0.78);
}

/* ---------- 03 团队 ---------- */

.page-about .about-figure {
  margin: 1.9rem 0 2rem;
}

.page-about .about-figure .figure-media {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.page-about .about-figure .figure-caption {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(215, 227, 244, 0.55);
}

.page-about .about-figure--timeline {
  margin-top: 2.4rem;
  margin-bottom: 0;
}

.page-about .role-list {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .role {
  position: relative;
  padding: 1.4rem 1.35rem 1.35rem 1.55rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: rgba(16, 30, 56, 0.42);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.page-about .role::after {
  content: "";
  position: absolute;
  left: 0;
  top: 1.4rem;
  bottom: 1.4rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
}

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

.page-about .role-tag {
  display: inline-block;
  margin-bottom: 0.7rem;
  padding: 0.16rem 0.52rem;
  border: 1px solid var(--line-cyan);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .role h3 {
  margin: 0 0 0.5rem;
  font-size: 1.04rem;
  color: var(--white);
  letter-spacing: 0.02em;
}

.page-about .role p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.76;
  color: rgba(215, 227, 244, 0.78);
}

.page-about .role a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 04 时间线 ---------- */

.page-about .timeline {
  display: grid;
  gap: 2rem;
  margin: 1.9rem 0 0;
  padding: 0 0 0 1.4rem;
  list-style: none;
  border-left: 1px solid rgba(45, 226, 230, 0.28);
}

.page-about .tl-item {
  position: relative;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -1.7rem;
  top: 0.45rem;
  width: 9px;
  height: 9px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-900);
  box-shadow: 0 0 0 4px rgba(45, 226, 230, 0.12);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(45, 226, 230, 0.2), 0 0 18px rgba(45, 226, 230, 0.85);
}

.page-about .tl-year {
  display: inline-block;
  margin-bottom: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .tl-item h3 {
  margin: 0 0 0.5rem;
  font-size: 1.08rem;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .tl-item p {
  max-width: 62ch;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.82;
  color: rgba(215, 227, 244, 0.78);
}

/* ---------- 05 准则与荣誉 ---------- */

.page-about .principle-list {
  counter-reset: pnum;
  display: grid;
  gap: 1px;
  margin: 1.9rem 0 0;
  padding: 0;
  list-style: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--line-soft);
}

.page-about .principle-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 0.4rem 1.2rem;
  padding: 1.5rem 1.4rem;
  background: linear-gradient(120deg, rgba(10, 20, 40, 0.95), rgba(16, 30, 56, 0.72));
}

.page-about .principle-list li::before {
  counter-increment: pnum;
  content: "0" counter(pnum);
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .principle-list h3 {
  margin: 0;
  font-size: 1.04rem;
  color: var(--white);
  letter-spacing: 0.02em;
}

.page-about .principle-list p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: rgba(215, 227, 244, 0.78);
}

.page-about .honor-strip {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.page-about .honor {
  padding: 1.55rem 1.35rem;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(100% 92% at 100% 0%, rgba(45, 226, 230, 0.16), transparent 62%),
    linear-gradient(160deg, rgba(23, 42, 74, 0.88), rgba(10, 20, 40, 0.62));
}

.page-about .honor-year {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--cyan-soft);
}

.page-about .honor h3 {
  margin: 0 0 0.45rem;
  font-size: 1.04rem;
  line-height: 1.5;
  color: var(--white);
}

.page-about .honor-desc {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: rgba(215, 227, 244, 0.72);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding: 2.1rem 1.6rem;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(140deg, rgba(45, 226, 230, 0.14), rgba(255, 107, 53, 0.12) 72%),
    rgba(10, 20, 40, 0.82);
}

.page-about .about-cta h2 {
  margin: 0 0 0.7rem;
  font-family: var(--font-head);
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-cta p {
  max-width: 52ch;
  margin: 0 0 1.5rem;
  font-size: 0.93rem;
  line-height: 1.82;
  color: rgba(215, 227, 244, 0.84);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-contrast {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.3rem;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 3rem 0 4.5rem;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 3.2rem;
    align-items: center;
    margin-top: 1.8rem;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 3.8rem;
    align-items: start;
    padding: 4rem 0 6rem;
  }

  .page-about .about-rail {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-flow {
    gap: 5.5rem;
  }

  .page-about .about-chapter::after {
    bottom: -2.75rem;
  }

  .page-about .about-cta {
    padding: 2.8rem 2.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rhythm-card,
  .page-about .role,
  .page-about .rail-list a,
  .page-about .tl-item::before {
    transition: none;
  }

  .page-about .rhythm-card:hover,
  .page-about .role:hover,
  .page-about .rail-list a:hover,
  .page-about .rail-list a:focus-visible {
    transform: none;
  }
}