.page-about {
  --about-gap: clamp(20px, 4vw, 36px);
  --about-pad-y: clamp(48px, 7vw, 96px);
  color: var(--fog-100);
}

.page-about .page-about__top {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-about .section {
  padding-block: var(--about-pad-y);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(18px, 4vw, 44px);
  padding-bottom: clamp(30px, 5vw, 68px);
}

.page-about .about-hero__copy {
  min-width: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(38px, 8vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  color: var(--fog-100);
}

.page-about .about-hero .lede {
  margin-top: 18px;
  max-width: 46ch;
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink-900);
}

.page-about .about-stats__num {
  font-size: clamp(18px, 2.6vw, 26px);
  line-height: 1;
  color: var(--cyan-400);
  letter-spacing: 0.02em;
}

.page-about .about-stats__k {
  font-size: 13px;
  color: var(--mist-300);
  letter-spacing: 0.02em;
}

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(14px);
  overflow: hidden;
}

.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan-400), transparent 80%);
}

.page-about .about-hero__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-about .about-hero__panel .data-list {
  margin: 0 0 18px;
}

.page-about .about-hero__panel .link-arrow {
  margin-top: 4px;
}

/* ---------- 节点导航 ---------- */
.page-about .about-nodes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border-block: 1px solid var(--line-soft);
}

.page-about .about-nodes__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 18px;
  background: var(--ink-950);
  color: var(--mist-300);
  text-decoration: none;
  transition: background 200ms var(--ease), color 200ms var(--ease);
}

.page-about .about-nodes__link:hover,
.page-about .about-nodes__link:focus-visible {
  background: var(--ink-800);
  color: var(--fog-100);
}

.page-about .about-nodes__yr {
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--cyan-400);
}

.page-about .about-nodes__tx {
  font-size: 14px;
}

/* ---------- 锚点偏移 ---------- */
.page-about #y2019,
.page-about #y2021,
.page-about #y2023,
.page-about #weekly {
  scroll-margin-top: 96px;
}

/* ---------- 时间线 ---------- */
.page-about .about-media {
  margin-top: clamp(24px, 4vw, 40px);
  margin-bottom: clamp(24px, 4vw, 40px);
}

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

.page-about .era-track {
  list-style: none;
  margin: clamp(20px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-left: 2px solid var(--line);
}

.page-about .era-track__item {
  position: relative;
  padding: 0 18px 26px 22px;
  min-width: 0;
}

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

.page-about .era-track__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--cyan-400);
}

.page-about .era-track__year {
  display: block;
  font-size: 20px;
  line-height: 1;
  color: var(--cyan-400);
  letter-spacing: 0.04em;
}

.page-about .era-track__title {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--fog-100);
}

.page-about .era-track__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist-300);
}

/* ---------- 入口章节 ---------- */
.page-about .about-entry__grid {
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-points li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-points li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-points .mono {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan-400);
  padding-top: 4px;
}

.page-about .about-points h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--fog-100);
}

.page-about .about-points p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist-300);
}

.page-about .about-entry__panel {
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--radius);
}

.page-about .about-entry__panel .card__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--fog-100);
}

.page-about .about-steps {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fog-100);
}

.page-about .about-steps .mono {
  color: var(--cyan-400);
  font-size: 14px;
}

.page-about .about-entry__note {
  margin: 0 0 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-300);
}

/* ---------- 演进章节 ---------- */
.page-about .evolve-pair {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-card {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--slate-700);
  border-radius: var(--radius);
  background: var(--ink-800);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  border-color: var(--cyan-400);
  transform: translateY(-3px);
}

.page-about .about-card--accent {
  background: linear-gradient(160deg, var(--ink-800), var(--ink-900));
}

.page-about .about-card__k {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan-400);
}

.page-about .about-card__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--fog-100);
}

.page-about .about-card > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .about-card__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 10px;
}

.page-about .about-card__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--fog-100);
}

.page-about .about-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--cyan-400);
}

.page-about .about-evolve__media {
  margin-top: var(--about-gap);
}

/* ---------- 浏览习惯 ---------- */
.page-about .habit-grid {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .habit-stats {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .habit-stat {
  padding: clamp(18px, 3vw, 26px);
  background: var(--ink-900);
}

.page-about .habit-stat__num {
  display: block;
  font-size: clamp(32px, 6vw, 48px);
  line-height: 1;
  color: var(--cyan-400);
  letter-spacing: -0.01em;
}

.page-about .habit-stat p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .habit-stat--text {
  background: var(--ink-800);
}

.page-about .habit-stat--text p {
  margin: 0;
  color: var(--fog-100);
}

/* ---------- 每周节奏 ---------- */
.page-about .weekly-tags {
  margin-top: clamp(20px, 3vw, 30px);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .weekly-list {
  list-style: none;
  margin: clamp(20px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .weekly-list li {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .weekly-list li:last-child {
  padding-bottom: 0;
}

.page-about .weekly-list__when {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan-400);
}

.page-about .weekly-list__body h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 600;
  color: var(--fog-100);
}

.page-about .weekly-list__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist-300);
}

/* ---------- 收束 ---------- */
.page-about .about-next__inner {
  display: grid;
  gap: var(--about-gap);
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(140deg, var(--ink-800), var(--ink-900));
}

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

.page-about .about-next__lede {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-next__links a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-sm);
  color: var(--fog-100);
  font-size: 15px;
  text-decoration: none;
  transition: border-color 200ms var(--ease), background 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  border-color: var(--cyan-400);
  background: var(--ink-800);
  transform: translateX(3px);
}

.page-about .about-next__links .mono {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan-400);
}

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

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

@media (min-width: 720px) {
  .page-about .weekly-list li {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .weekly-list__when {
    padding-top: 4px;
  }
}

@media (min-width: 860px) {
  .page-about .era-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-left: 0;
    border-top: 2px solid var(--line);
  }

  .page-about .era-track__item {
    padding: 26px 24px 0 0;
  }

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

  .page-about .era-track__item::before {
    left: 0;
    top: -8px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

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

  .page-about .habit-grid {
    grid-template-columns: 0.9fr 1.1fr;
  }

  .page-about .about-next__inner {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-nodes__link,
  .page-about .about-next__links a {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-card:focus-within,
  .page-about .about-next__links a:hover,
  .page-about .about-next__links a:focus-visible {
    transform: none;
  }
}
<<<END>>>