.page-about {
  --about-num-col: 78px;
  --about-measure: 34em;
  --about-line: rgba(169, 175, 185, 0.24);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
  padding-block-end: clamp(48px, 7vw, 104px);
}

.page-about figure {
  margin: 0;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: clamp(18px, 2.6vw, 36px) clamp(32px, 5vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  left: -22%;
  width: 92%;
  height: 118%;
  background: radial-gradient(52% 52% at 34% 30%, rgba(255, 154, 77, 0.16), rgba(255, 90, 31, 0.05) 46%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 48px);
  margin-block-start: clamp(22px, 3vw, 40px);
}

.page-about .about-kicker {
  margin: 0 0 clamp(12px, 1.6vw, 20px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-title {
  margin: 0 0 clamp(18px, 2.4vw, 30px);
  margin-inline-start: clamp(-38px, -2.6vw, 0px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 6vw, 4.6rem);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-lede {
  max-width: 30em;
  margin: 0;
  font-size: clamp(0.975rem, 1.1vw, 1.0625rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero-figure {
  position: relative;
  padding: 10px;
  border: 1px solid var(--about-line);
  background: var(--panel);
}

.page-about .about-hero-figure::before,
.page-about .about-hero-figure::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 1px solid var(--cyan);
  opacity: 0.65;
}

.page-about .about-hero-figure::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero-figure::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  margin-block-start: clamp(28px, 4vw, 54px);
  padding-block-start: clamp(14px, 2vw, 22px);
  border-top: 1px solid var(--about-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .about-jump a {
  padding-block: 4px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--orange-fallback, var(--ember));
}

.page-about .about-jump a[aria-current="location"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding-block: clamp(46px, 6.5vw, 100px);
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 26px);
}

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  padding-block-start: 0.55em;
}

.page-about .about-body {
  max-width: var(--about-measure);
}

.page-about .about-body--wide {
  max-width: 42em;
}

.page-about .section-title {
  margin: 0 0 clamp(16px, 2.2vw, 26px);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 2.6vw, 2.25rem);
  line-height: 1.16;
  letter-spacing: -0.005em;
  color: var(--paper);
}

.page-about .about-text p {
  margin: 0 0 clamp(18px, 2.2vw, 30px);
  color: var(--mist);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .about-text p.answer {
  color: var(--paper);
  font-size: clamp(1.02rem, 1.2vw, 1.1rem);
}

.page-about .about-text p:last-child {
  margin-block-end: 0;
}

.page-about .about-text .text-link {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--ember);
  text-decoration: none;
  border-bottom: 1px solid var(--ember);
  padding-block-end: 2px;
}

/* ---------- 四类归并 ---------- */

.page-about .about-cats {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 clamp(22px, 3vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border: 1px solid var(--about-line);
  background: var(--about-line);
}

.page-about .about-cat {
  background: var(--panel);
  padding: clamp(18px, 2.2vw, 26px);
}

.page-about .about-cat-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  margin-block-end: 8px;
}

.page-about .about-cat-name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-cat-text {
  margin: 0 0 14px;
  color: var(--mist);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .about-cat-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  opacity: 0.85;
}

.page-about .about-aside-figure {
  position: relative;
  border: 1px solid var(--about-line);
  padding: 8px;
  background: var(--panel);
  align-self: start;
}

/* ---------- 时间轴 ---------- */

.page-about .about-band {
  position: relative;
  margin: clamp(22px, 3vw, 36px) 0 clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--about-line);
  padding: 8px;
  background: var(--panel);
}

.page-about .about-track {
  list-style: none;
  position: relative;
  margin: clamp(20px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(25, 227, 168, 0.12) 100%);
}

.page-about .about-track-item {
  position: relative;
  padding-inline-start: clamp(30px, 3.4vw, 46px);
  padding-block: clamp(16px, 2vw, 24px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-track-item:last-child {
  border-bottom: 0;
  padding-block-end: 0;
}

.page-about .about-track-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(clamp(16px, 2vw, 24px) + 8px);
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(25, 227, 168, 0.08);
  transition: box-shadow 0.2s var(--ease);
}

.page-about .about-track-item:hover::before {
  box-shadow: 0 0 0 6px rgba(25, 227, 168, 0.16);
}

.page-about .about-ver {
  display: inline-block;
  margin-block-end: 8px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: 1px solid rgba(25, 227, 168, 0.35);
  border-radius: 2px;
}

.page-about .about-track-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.12rem, 1.6vw, 1.32rem);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-track-item p {
  margin: 0;
  max-width: var(--about-measure);
  color: var(--mist);
  font-size: 0.96rem;
  line-height: 1.85;
}

/* ---------- 季度复核 ---------- */

.page-about .about-review-list {
  list-style: none;
  margin: clamp(20px, 2.8vw, 32px) 0 clamp(22px, 3vw, 34px);
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-review-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding-block: clamp(14px, 1.8vw, 20px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-review-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-review-val {
  color: var(--mist);
  font-size: 0.96rem;
  line-height: 1.8;
}

/* ---------- 不动的三件事（唯一浅色焦点） ---------- */

.page-about .about-fixed {
  padding-block: clamp(46px, 6.5vw, 100px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-paper {
  background: var(--paper);
  color: var(--sepia);
  padding: clamp(26px, 4.2vw, 62px);
  box-shadow: var(--shadow);
}

.page-about .about-paper-idx {
  margin: 0 0 clamp(12px, 1.6vw, 20px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ember);
}

.page-about .about-paper-title {
  margin: 0 0 clamp(20px, 3vw, 36px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 2.8vw, 2.4rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--sepia);
}

.page-about .about-fixed-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.4vw, 28px);
}

.page-about .about-fixed-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: clamp(10px, 1.4vw, 18px);
  padding-block-start: clamp(14px, 1.8vw, 20px);
  border-top: 1px solid rgba(42, 29, 22, 0.18);
}

.page-about .about-fixed-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(42, 29, 22, 0.55);
  padding-block-start: 4px;
}

.page-about .about-fixed-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: 0.01em;
  color: var(--sepia);
}

.page-about .about-fixed-body p {
  margin: 0;
  max-width: 32em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(42, 29, 22, 0.78);
}

/* ---------- 服务与联系 ---------- */

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block-start: clamp(22px, 3vw, 34px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-fixed-item {
    display: block;
    padding-block-start: clamp(14px, 1.8vw, 20px);
  }

  .page-about .about-fixed-idx {
    display: block;
    margin-block-end: 10px;
    padding-block-start: 0;
  }

  .page-about .about-review-item {
    grid-template-columns: 10em minmax(0, 1fr);
    gap: clamp(12px, 2vw, 28px);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-row {
    grid-template-columns: var(--about-num-col) minmax(0, 1fr);
    column-gap: clamp(16px, 2.4vw, 36px);
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: end;
    gap: clamp(28px, 3.4vw, 56px);
  }

  .page-about .about-section {
    padding-block: clamp(58px, 7vw, 108px);
  }
}

@media (min-width: 1180px) {
  .page-about .about-row--split {
    grid-template-columns: var(--about-num-col) minmax(0, 34em) minmax(0, 21em);
    column-gap: clamp(24px, 3vw, 48px);
    align-items: start;
  }

  .page-about .about-cats {
    margin-block-end: clamp(24px, 3vw, 36px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump a,
  .page-about .about-track-item::before {
    transition: none;
  }
}

.page-about {
  --orange-fallback: currentColor;
}