.page-about {
  --about-cut: 18px;
  background: var(--paper);
  color: var(--text);
}

.page-about a:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--white);
  padding-top: 2.25rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(118deg,
      rgba(11, 59, 46, 0) 0 58%,
      rgba(200, 16, 46, .82) 58% 71%,
      rgba(11, 59, 46, 0) 71% 100%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
  padding-bottom: 2.75rem;
}

.page-about .about-hero-copy h1 {
  margin: .8rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 5.6vw, 3.05rem);
  line-height: 1.26;
  letter-spacing: -.012em;
  color: var(--white);
}

.page-about .about-hero-lead {
  margin: 1.15rem 0 0;
  max-width: 30em;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: rgba(255, 255, 255, .82);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero-mark {
  margin: 0;
  max-width: 230px;
  clip-path: polygon(
    0 0,
    calc(100% - var(--about-cut)) 0,
    100% var(--about-cut),
    100% 100%,
    var(--about-cut) 100%,
    0 calc(100% - var(--about-cut))
  );
}

.page-about .about-hero-mark img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-hero-facts-band {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--hairline-soft);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  margin: 0;
  padding-block: 1.25rem 1.5rem;
  list-style: none;
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .about-fact-label {
  display: block;
  margin-top: .3rem;
  font-size: .8125rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, .7);
}

/* ---------- 主体双栏 ---------- */

.page-about .about-body {
  display: grid;
  gap: 2.75rem;
  padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(3rem, 7vw, 5rem);
}

.page-about .about-main {
  display: grid;
  gap: clamp(2rem, 4.5vw, 3rem);
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .about-section {
  position: relative;
  padding-top: 1.75rem;
  border-top: 1px solid var(--hairline-soft);
  scroll-margin-top: 5rem;
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section-no {
  margin: 0 0 .6rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .2em;
  color: var(--red);
}

.page-about .about-section h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  line-height: 1.36;
  letter-spacing: -.005em;
  color: var(--ink);
}

.page-about .about-section h2::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 3px;
  margin-top: .75rem;
  background: linear-gradient(90deg, var(--gold), var(--red));
}

.page-about .about-section > p {
  max-width: 36em;
  margin: 0;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text);
}

.page-about .about-section > p + p {
  margin-top: 1rem;
}

.page-about .about-section a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--gold);
  text-underline-offset: 3px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-section a:hover {
  color: var(--red);
}

/* ---------- 行内注 ---------- */

.page-about .about-inline-note {
  max-width: 36em;
  margin: 1.5rem 0 0;
  padding: .9rem 1.1rem;
  background: rgba(212, 175, 55, .14);
  border-left: 3px solid var(--gold);
}

.page-about .about-inline-note p {
  margin: 0;
  max-width: none;
  font-size: .8125rem;
  line-height: 1.75;
  letter-spacing: .01em;
  color: var(--ink);
}

/* ---------- 发展历程 ---------- */

.page-about .about-timeline-figure {
  margin: 1.6rem 0 2rem;
}

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

.page-about .about-timeline-figure img {
  border: 1px solid var(--hairline-soft);
}

.page-about .about-figure-cap {
  margin-top: .65rem;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 1.85rem;
  margin: 0;
  padding: 0 0 0 2.9rem;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 1.05rem;
  top: .6rem;
  bottom: .6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--red) 52%, var(--data) 100%);
  transform: skewX(-11deg);
  transform-origin: top center;
}

.page-about .about-stage {
  position: relative;
}

.page-about .about-stage-badge {
  position: absolute;
  left: -2.9rem;
  top: .1rem;
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink);
  background: var(--gold-light);
  clip-path: polygon(
    0 0,
    calc(100% - 8px) 0,
    100% 8px,
    100% 100%,
    8px 100%,
    0 calc(100% - 8px)
  );
}

.page-about .about-stage-body h3 {
  margin: 0 0 .4rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink);
}

.page-about .about-stage-body p {
  margin: 0;
  max-width: 34em;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 团队分工 ---------- */

.page-about .about-roster {
  display: grid;
  gap: 1px;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--rule-ink);
  border: 1px solid var(--rule-ink);
}

.page-about .about-role {
  background: var(--white);
  padding: 1.3rem 1.35rem 1.4rem;
}

.page-about .about-role-num {
  display: inline-block;
  padding: .25rem .6rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--white);
  background: var(--ink);
  clip-path: polygon(
    0 0,
    calc(100% - 8px) 0,
    100% 8px,
    100% 100%,
    8px 100%,
    0 calc(100% - 8px)
  );
}

.page-about .about-role h3 {
  margin: .8rem 0 .35rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-role p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 步骤条 ---------- */

.page-about .about-steps {
  display: grid;
  gap: .8rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  max-width: 36em;
}

.page-about .about-steps li {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-steps li span {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 1.6rem;
  height: 1.6rem;
  margin-top: .1rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  color: var(--ink);
  background: var(--gold-light);
  clip-path: polygon(
    0 0,
    calc(100% - 6px) 0,
    100% 6px,
    100% 100%,
    6px 100%,
    0 calc(100% - 6px)
  );
}

.page-about .about-aside-line {
  margin-top: 1.5rem !important;
  padding-left: 1.1rem;
  border-left: 2px solid var(--data);
  font-size: .9375rem;
  color: var(--ink);
}

/* ---------- 覆盖规模 ---------- */

.page-about .about-reach-figure {
  margin: 1.6rem 0 0;
}

.page-about .about-reach-figure img {
  border: 1px solid var(--hairline);
}

/* ---------- 右侧注释列 ---------- */

.page-about .about-notes {
  display: grid;
  gap: 1.5rem;
  align-content: start;
  min-width: 0;
}

.page-about .about-note {
  padding: 1.3rem 1.3rem 1.4rem;
  background: linear-gradient(180deg, rgba(240, 217, 140, .38), rgba(240, 217, 140, .16));
  border: 1px solid var(--hairline-soft);
  clip-path: polygon(
    0 0,
    calc(100% - var(--about-cut)) 0,
    100% var(--about-cut),
    100% 100%,
    var(--about-cut) 100%,
    0 calc(100% - var(--about-cut))
  );
}

.page-about .about-note-title {
  margin: 0 0 .95rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--red);
}

.page-about .about-note-dl {
  margin: 0;
  display: grid;
  gap: .8rem;
}

.page-about .about-note-dl > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: .7rem;
  border-bottom: 1px dashed var(--hairline-soft);
}

.page-about .about-note-dl > div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-note-dl dt {
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-note-dl dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .9375rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .about-note-links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .65rem;
}

.page-about .about-note-links a {
  display: block;
  padding-left: .7rem;
  font-size: .875rem;
  line-height: 1.65;
  color: var(--ink);
  text-decoration: none;
  border-left: 2px solid var(--gold);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-note-links a:hover {
  color: var(--red);
  border-color: var(--red);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
  }

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

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

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .85fr);
    align-items: end;
    gap: 3rem;
    padding-bottom: 3.5rem;
  }

  .page-about .about-hero-mark {
    max-width: 300px;
    justify-self: end;
  }

  .page-about .about-timeline {
    padding-left: 3.4rem;
  }

  .page-about .about-timeline::before {
    left: 1.35rem;
  }

  .page-about .about-stage-badge {
    left: -3.4rem;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: 4.5rem;
    align-items: start;
  }

  .page-about .about-notes {
    position: sticky;
    top: 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-note-links a,
  .page-about .about-section a {
    transition: none;
  }
}