.page-about {
  --ab-shell: min(100%, 1180px);
  --ab-pad: clamp(18px, 4vw, 52px);
  --ab-gap: clamp(20px, 3vw, 36px);
  --ab-line-light: rgba(11, 30, 45, 0.14);
  --ab-glass: rgba(18, 52, 74, 0.58);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  overflow-x: clip;
}

.page-about p {
  margin: 0 0 1em;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  line-height: 1.16;
}

.page-about a {
  color: inherit;
}

.page-about .about-shell {
  width: var(--ab-shell);
  margin-inline: auto;
  padding-inline: var(--ab-pad);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--bar-h) + clamp(26px, 5vw, 54px));
  padding-bottom: clamp(36px, 6vw, 72px);
  background:
    radial-gradient(58% 46% at 84% 10%, rgba(127, 183, 163, 0.16), transparent 70%),
    radial-gradient(46% 44% at 6% 86%, rgba(184, 107, 75, 0.15), transparent 72%),
    var(--ink);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-crumbs {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--celadon);
}

.page-about .about-eyebrow__dash {
  display: block;
  width: 34px;
  height: 2px;
  background: var(--coral);
}

.page-about h1 {
  font-size: clamp(32px, 5.6vw, 68px);
  line-height: 1.08;
}

.page-about .about-hero__lead {
  max-width: 46ch;
  margin-top: clamp(16px, 2.4vw, 22px);
  color: rgba(244, 241, 234, 0.84);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-hero__actions--end {
  margin-top: clamp(24px, 3.4vw, 32px);
}

.page-about .about-hero__media {
  margin: 0;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .about-hero__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(28px, 4.4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 15px 16px;
  background: rgba(11, 30, 45, 0.88);
}

.page-about .about-fact__key {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-fact__value {
  font-family: var(--font-mono);
  font-size: clamp(17px, 2vw, 21px);
  color: var(--celadon);
  letter-spacing: 0.01em;
}

/* 斜切过渡 */
.page-about .about-slant {
  height: clamp(30px, 4.4vw, 56px);
  background: linear-gradient(to bottom right, var(--ink) 49.6%, var(--paper) 50%);
}

.page-about .about-slant--flip {
  background: linear-gradient(to bottom left, var(--ink) 49.6%, var(--paper) 50%);
}

/* 章节骨架 */
.page-about .about-band {
  padding-block: clamp(42px, 6.5vw, 86px);
}

.page-about .about-band--ink {
  background: var(--ink);
}

.page-about .about-band--deep {
  background:
    radial-gradient(70% 60% at 92% 0%, rgba(127, 183, 163, 0.1), transparent 68%),
    var(--ink-2);
}

.page-about .about-band--paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-band--reach {
  background:
    linear-gradient(160deg, rgba(242, 107, 79, 0.14), transparent 58%),
    var(--ink);
}

.page-about .about-chapter {
  display: grid;
  gap: clamp(16px, 2.6vw, 28px);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-num {
  font-family: var(--font-serif);
  font-size: clamp(34px, 5.4vw, 54px);
  line-height: 1;
  color: var(--coral);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

.page-about .about-num:hover,
.page-about .about-num:focus-visible {
  color: var(--coral-soft);
  transform: translateY(-2px);
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 14.5px;
  letter-spacing: 0.08em;
  opacity: 0.76;
}

.page-about .about-chapter__body h2 {
  font-size: clamp(25px, 3.4vw, 40px);
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-about .about-lede {
  font-size: clamp(16.5px, 1.6vw, 18.5px);
  line-height: 1.9;
}

.page-about .about-band--paper .about-card,
.page-about .about-band--paper .about-level {
  background: rgba(255, 255, 255, 0.6);
}

/* 能力卡片 */
.page-about .about-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(20px, 3.2vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-card {
  padding: 17px 18px 18px;
  border: 1px solid var(--ab-line-light);
  border-radius: var(--radius);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

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

.page-about .about-card h3 {
  font-size: 17.5px;
  margin-bottom: 7px;
  color: var(--ink);
}

.page-about .about-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(11, 30, 45, 0.78);
}

.page-about .about-card--accent {
  background: var(--moss);
  border-color: var(--moss);
}

.page-about .about-card--accent h3,
.page-about .about-card--accent p {
  color: var(--paper);
}

/* 玻璃引言 */
.page-about .about-glass {
  margin: clamp(16px, 2.4vw, 24px) 0 clamp(22px, 3.2vw, 32px);
  padding: clamp(16px, 2.6vw, 24px) clamp(18px, 2.8vw, 26px);
  background: var(--ab-glass);
  border: 1px solid var(--line);
  border-left: 3px solid var(--celadon);
  border-radius: var(--radius);
}

.page-about .about-glass p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.85;
  color: var(--paper);
}

/* 三阶段路径 */
.page-about .about-flow {
  position: relative;
  margin: 0;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-flow > li {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 30px);
}

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

.page-about .about-flow > li::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--celadon);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-flow > li:hover::before {
  background: var(--coral);
  border-color: var(--coral);
  transform: scale(1.2);
}

.page-about .about-flow__stage {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--celadon);
}

.page-about .about-flow h3 {
  margin: 8px 0 8px;
  font-size: clamp(19px, 2.2vw, 22px);
}

.page-about .about-flow p {
  margin: 0;
  color: rgba(244, 241, 234, 0.82);
  font-size: 16px;
}

.page-about .about-flow__note {
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* 图文错位 */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3.2vw, 38px);
  margin-top: clamp(18px, 2.6vw, 26px);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-band--paper .about-figure figcaption {
  color: var(--stone);
}

.page-about .about-band--paper .about-figure img {
  border-color: var(--ab-line-light);
}

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

/* 数字条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stat {
  padding: 16px 15px;
  background: var(--ink);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  color: var(--coral);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* 适配等级 */
.page-about .about-levels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-level {
  padding: 17px 18px 18px;
  border: 1px solid var(--ab-line-light);
  border-radius: var(--radius);
}

.page-about .about-level__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 10px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-level__badge--a {
  background: var(--celadon);
  color: var(--ink);
}

.page-about .about-level__badge--b {
  background: var(--clay);
  color: var(--paper);
}

.page-about .about-level__badge--c {
  background: var(--stone);
  color: var(--paper);
}

.page-about .about-level h3 {
  font-size: 17px;
  margin-bottom: 7px;
  color: var(--ink);
}

.page-about .about-level p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(11, 30, 45, 0.78);
}

/* 入口列表 */
.page-about .about-links {
  margin: clamp(22px, 3.2vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-link-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 2px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  font-size: 15.5px;
  line-height: 1.7;
  transition: color 0.2s ease, border-color 0.2s ease, padding-left 0.2s ease;
}

.page-about .about-link-row:hover,
.page-about .about-link-row:focus-visible {
  color: var(--coral);
  border-bottom-color: var(--coral);
  padding-left: 8px;
}

.page-about .about-link-row__arrow {
  flex: none;
  font-family: var(--font-mono);
  color: var(--celadon);
}

/* 中等屏幕 */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

/* 桌面布局 */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
    gap: clamp(30px, 4vw, 56px);
  }

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

  .page-about .about-chapter {
    grid-template-columns: 178px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 62px);
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: calc(var(--bar-h) + 26px);
    align-self: start;
    display: block;
    padding-left: 16px;
    border-left: 2px solid var(--coral);
  }

  .page-about .about-kicker {
    margin-top: 10px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
    align-items: center;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

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

@media (min-width: 1024px) {
  .page-about .about-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-link-row,
  .page-about .about-num,
  .page-about .about-flow > li::before {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-num:hover {
    transform: none;
  }
}
<<<END>>>