.page-about {
  --about-gap: clamp(1.4rem, 3.4vw, 2.6rem);
  --about-mono-accent: var(--neon);
  position: relative;
  overflow-x: clip;
}

/* 纸白章节上的文字对比度修正 */
.page-about .section--paper .section-num {
  color: #0A6B44;
}

.page-about .section--paper .label {
  color: #5A6473;
}

.page-about .section--paper .card__label {
  color: #5A6473;
}

/* ---------- 首屏 ---------- */
.page-about__intro {
  padding-top: clamp(2.2rem, 5vw, 3.6rem);
}

.page-about__kicker {
  display: block;
  margin-top: clamp(1.1rem, 3vw, 1.9rem);
}

.page-about__title {
  font-size: clamp(2rem, 5.6vw, 4.2rem);
  font-weight: 250;
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--text-body);
  margin: 0.7rem 0 0;
  max-width: 22ch;
}

.page-about__intro-grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about__lede {
  margin: 0;
  max-width: 50ch;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.page-about__facts li {
  min-width: 0;
  padding: 0.9rem 0.7rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--ink-black);
}

.page-about__fact-num {
  font-size: clamp(1.4rem, 3.6vw, 2.1rem);
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
}

.page-about__fact-label {
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--fog);
}

.page-about__hero {
  margin: clamp(1.8rem, 4.5vw, 3rem) 0 0;
}

/* ---------- 01 三种人 ---------- */
.page-about__roles {
  display: grid;
  gap: 1px;
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  background: rgba(10, 13, 18, 0.12);
  border: 1px solid rgba(10, 13, 18, 0.12);
}

.page-about__role {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: clamp(1.15rem, 2.4vw, 1.75rem);
  border: 0;
  border-radius: 0;
  background: #ffffff;
}

.page-about__role .card__title {
  margin: 0;
  font-size: 1.14rem;
  line-height: 1.4;
}

.page-about__role .card__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--text-on-paper-soft);
}

.page-about__role-link {
  align-self: flex-start;
  margin-top: auto;
  padding-top: 0.6rem;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--ink-on-paper);
  text-decoration: none;
  border-bottom: 2px solid rgba(10, 13, 18, 0.18);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about__role-link:hover,
.page-about__role-link:focus-visible {
  color: #0B4FBF;
  border-color: var(--volt);
}

/* ---------- 02 覆盖与节奏 ---------- */
.page-about__coverage {
  position: relative;
  isolation: isolate;
}

.page-about__coverage::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 76% at 88% 10%, rgba(60, 140, 255, 0.16), transparent 70%),
    radial-gradient(48% 58% at 6% 94%, rgba(59, 255, 158, 0.09), transparent 72%);
}

.page-about__coverage-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about__coverage-lede {
  margin-top: 0.4rem;
  color: var(--text-soft);
}

.page-about__coverage-list {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.95rem;
}

.page-about__coverage-list li {
  position: relative;
  padding-left: 1.6rem;
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--text-body);
}

.page-about__coverage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 0.9rem;
  height: 1px;
  background: var(--about-mono-accent);
}

.page-about__rhythm {
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about__rhythm-card {
  display: grid;
  gap: 0.5rem;
  padding: clamp(1.1rem, 2.4vw, 1.55rem);
  background: var(--graphite);
}

.page-about__rhythm-card--live {
  background: var(--deep-green);
}

.page-about__rhythm-time {
  margin: 0;
  font-size: 1.02rem;
  color: var(--text-body);
}

.page-about__rhythm-card--live .page-about__rhythm-time {
  color: var(--neon);
}

.page-about__rhythm-text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--fog);
}

/* ---------- 03 四道手 ---------- */
.page-about__check-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about__steps {
  list-style: none;
  margin: clamp(1.4rem, 3.4vw, 2.2rem) 0 0;
  padding: 0;
  display: grid;
}

.page-about__step {
  display: grid;
  grid-template-columns: 1.9rem minmax(0, 1fr);
  gap: 0.9rem;
  padding-bottom: 1.3rem;
  border-bottom: 1px solid var(--hairline);
}

.page-about__step + .page-about__step {
  padding-top: 1.3rem;
}

.page-about__step:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about__step-num {
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--neon);
}

.page-about__step-title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-body);
}

.page-about__step-text {
  margin: 0.35rem 0 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--fog);
}

.page-about__check-note {
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding: 0.85rem 1rem;
  border-left: 2px solid var(--neon);
  background: rgba(59, 255, 158, 0.06);
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--text-soft);
}

.page-about__check-media {
  min-width: 0;
}

/* ---------- 04 时间轴 ---------- */
.page-about__timeline-grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about__timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.page-about__timeline-list .timeline__time {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--neon);
}

.page-about__timeline-list .timeline__title {
  margin: 0.3rem 0 0;
  font-size: 1.05rem;
  line-height: 1.45;
  color: var(--text-body);
}

.page-about__timeline-list .timeline__text {
  margin: 0.35rem 0 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--fog);
}

.page-about__timeline-media {
  min-width: 0;
}

/* ---------- 05 团队 ---------- */
.page-about__table-wrap {
  margin-top: clamp(1.4rem, 3.4vw, 2.2rem);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid rgba(10, 13, 18, 0.14);
  background: #ffffff;
}

.page-about__table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

.page-about__table th,
.page-about__table td {
  padding: 0.85rem 1rem;
  text-align: left;
  vertical-align: top;
  font-size: 0.9rem;
  line-height: 1.7;
  border-bottom: 1px solid rgba(10, 13, 18, 0.1);
  color: var(--text-on-paper-soft);
}

.page-about__table thead th {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--ink-on-paper);
  border-bottom: 1px solid rgba(10, 13, 18, 0.24);
}

.page-about__table th[scope="row"] {
  font-weight: 700;
  white-space: nowrap;
  color: var(--ink-on-paper);
}

.page-about__table tbody tr {
  transition: background-color 0.22s var(--ease);
}

.page-about__table tbody tr:hover,
.page-about__table tbody tr:focus-within {
  background: rgba(60, 140, 255, 0.1);
}

.page-about__table tbody tr:last-child th,
.page-about__table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about__team-note {
  margin-top: 1.1rem;
  max-width: 62ch;
}

/* ---------- 06 交流 ---------- */
.page-about__exchange-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about__exchange-copy .prose {
  margin-top: 0.4rem;
  color: var(--text-soft);
}

.page-about__exchange-link {
  margin: clamp(1rem, 2.6vw, 1.5rem) 0 0;
}

.page-about__exchange-link a {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 255, 158, 0.45);
  padding-bottom: 0.15rem;
  transition: border-color 0.25s var(--ease);
}

.page-about__exchange-link a:hover,
.page-about__exchange-link a:focus-visible {
  border-color: var(--neon);
}

.page-about__exchange-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about__exchange-stats li {
  display: grid;
  grid-template-columns: minmax(3.4rem, auto) minmax(0, 1fr);
  gap: 1rem;
  align-items: baseline;
  padding: 0.95rem 1.05rem;
  background: var(--ink-black);
}

.page-about__stat-value {
  font-size: clamp(1.2rem, 3vw, 1.65rem);
  line-height: 1;
  color: var(--neon);
  white-space: nowrap;
}

.page-about__stat-text {
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--text-soft);
}

/* ---------- 07 联系方向 ---------- */
.page-about__reach-card {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 1.4rem;
  padding: clamp(1.5rem, 4vw, 2.8rem);
  border: 1px solid var(--hairline);
  background: linear-gradient(118deg, rgba(11, 42, 31, 0.95) 0%, rgba(6, 8, 11, 0.98) 64%);
}

.page-about__reach-card::after {
  content: "";
  position: absolute;
  right: -16%;
  top: -58%;
  width: 46%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 255, 158, 0.22), transparent 68%);
  pointer-events: none;
}

.page-about__reach-card > * {
  position: relative;
  z-index: 1;
}

.page-about__reach-copy {
  min-width: 0;
}

.page-about__reach-title {
  margin: 0.5rem 0 0;
  max-width: 18ch;
}

.page-about__reach-text {
  margin: 0.9rem 0 0;
  max-width: 52ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about__reach-cta {
  justify-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about__roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about__intro-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about__coverage-grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about__check-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about__timeline-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about__exchange-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about__reach-card {
    grid-template-columns: minmax(0, 8fr) auto;
    align-items: center;
    gap: 2.4rem;
  }

  .page-about__reach-cta {
    justify-self: end;
  }
}

@media (max-width: 430px) {
  .page-about__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about__facts li:last-child {
    grid-column: 1 / -1;
  }

  .page-about__exchange-stats li {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about__role-link,
  .page-about__exchange-link a,
  .page-about__table tbody tr {
    transition: none;
  }
}