.page-about {
  --ab-pad: clamp(42px, 7.5vw, 100px);
  --ab-gap: clamp(28px, 4.6vw, 58px);
  --ab-grid-line: rgba(122, 186, 214, 0.08);
  display: block;
}

/* ---------- HERO ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(22px, 3.6vw, 40px) 0 var(--ab-pad);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--ab-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ab-grid-line) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(125% 85% at 10% 0%, #000 0%, transparent 70%);
  mask-image: radial-gradient(125% 85% at 10% 0%, #000 0%, transparent 70%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  margin-top: clamp(30px, 5vw, 66px);
}

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

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(2.7rem, 11.5vw, 8.4rem);
  line-height: 0.9;
  letter-spacing: -0.045em;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-hero h1 em {
  display: block;
  font-style: normal;
  color: var(--cyan);
  font-weight: 800;
}

.page-about .about-hero__intro {
  max-width: 60ch;
  margin: 26px 0 0;
  font-size: clamp(0.98rem, 2.1vw, 1.16rem);
  line-height: 1.92;
  color: var(--text-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.6vw, 40px);
}

.page-about .about-hero__side {
  min-width: 0;
  display: grid;
  gap: 0;
  align-content: end;
}

.page-about .about-hero__scale {
  height: 20px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line-2);
  background-image: repeating-linear-gradient(
    to right,
    rgba(122, 186, 214, 0.38) 0 1px,
    transparent 1px 16px
  );
  background-repeat: repeat-x;
  background-position: left bottom;
  background-size: 16px 8px;
}

.page-about .about-hero__meta {
  margin: 0;
  border-top: 1px solid var(--line-2);
}

.page-about .about-hero__meta > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 2px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-hero__meta dt {
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--text-3);
  text-transform: uppercase;
}

.page-about .about-hero__meta dd {
  margin: 0;
  font-size: 0.86rem;
  color: var(--cyan);
  text-align: right;
  word-break: break-word;
}

/* ---------- 通用分节 ---------- */
.page-about .about-section {
  padding: var(--ab-pad) 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-head {
  max-width: 66ch;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-head--wide {
  max-width: 78ch;
}

.page-about .about-head h2 {
  margin: 12px 0 0;
  font-size: clamp(1.55rem, 4.6vw, 3rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 750;
  color: var(--text);
}

.page-about .about-head p {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-2);
}

/* ---------- 01 能力 ---------- */
.page-about .about-cap__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  align-items: start;
}

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

.page-about .about-cap__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-2);
  counter-reset: none;
}

.page-about .about-cap__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-cap__idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .about-cap__item h3 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .about-cap__item p {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: 0.94rem;
  line-height: 1.88;
  color: var(--text-2);
}

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

/* ---------- 02 三年 ---------- */
.page-about .about-track__fig {
  margin-bottom: clamp(30px, 4.6vw, 56px);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px 26px;
  border-left: 1px solid var(--line-2);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  border-radius: 50%;
}

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

.page-about .about-timeline__year {
  display: block;
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .about-timeline__item h3 {
  margin: 10px 0 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-timeline__item p {
  margin: 8px 0 0;
  font-size: 0.93rem;
  line-height: 1.86;
  color: var(--text-2);
  max-width: 42ch;
}

/* ---------- 03 使用方 ---------- */
.page-about .about-users__fig {
  margin-bottom: clamp(28px, 4.2vw, 52px);
}

.page-about .about-users__grid {
  align-items: stretch;
}

.page-about .about-user {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.page-about .about-user h3 {
  margin: 0;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-user p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.86;
  color: var(--text-2);
}

/* ---------- 04 下一步 ---------- */
.page-about .about-next {
  background:
    linear-gradient(180deg, rgba(47, 242, 208, 0.045) 0%, transparent 62%);
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 48px);
  align-items: end;
}

.page-about .about-next__text {
  max-width: 62ch;
  min-width: 0;
}

.page-about .about-next__text h2 {
  margin: 12px 0 0;
  font-size: clamp(1.6rem, 5vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  font-weight: 780;
  color: var(--text);
}

.page-about .about-next__text p {
  margin: 18px 0 0;
  font-size: 1rem;
  line-height: 1.92;
  color: var(--text-2);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(250px, 0.72fr);
    align-items: end;
  }

  .page-about .about-cap__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 3vw, 36px);
  }

  .page-about .about-timeline__item {
    padding: 22px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line-2);
  }

  .page-about .about-timeline__item::before {
    left: 0;
    top: -4px;
  }

  .page-about .about-timeline__item p {
    max-width: none;
  }
}

@media (max-width: 719px) {
  .page-about .about-hero__meta dd {
    font-size: 0.8rem;
  }

  .page-about .about-cap__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .page-about .about-cap__item p {
    grid-column: 1;
  }

  .page-about .about-cap__idx {
    padding-top: 0;
  }
}
<<<END>>>