.page-about {
  --about-gap: clamp(56px, 9vw, 112px);
  --about-lead: 1.9;
}

.page-about .crumbs {
  padding-top: 28px;
}

/* ---------- 首屏 ---------- */

.page-about__hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(44px, 7vw, 84px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(20, 224, 200, 0.16), transparent 62%),
    linear-gradient(180deg, rgba(18, 138, 75, 0.06), transparent 70%);
}

.page-about__hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 7.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin: 14px 0 22px;
  max-width: 16ch;
  color: var(--ink-blue);
}

.page-about__lede {
  max-width: 62ch;
  font-size: clamp(17px, 2.1vw, 20px);
  line-height: var(--about-lead);
  color: var(--ink-blue);
  margin: 0 0 18px;
}

.page-about__hero-note {
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--note);
  padding-left: 16px;
  border-left: 3px solid var(--cyan);
  margin: 0 0 34px;
}

.page-about__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 0;
}

.page-about__figure {
  background: var(--chalk);
  padding: 18px 18px 20px;
}

.page-about__figure-lbl {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--note);
  margin: 0 0 8px;
}

.page-about__figure-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1;
  color: var(--turf);
  margin: 0;
  letter-spacing: -0.02em;
}

.page-about__figure-num span {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--note);
  margin-left: 6px;
  letter-spacing: 0.04em;
}

/* ---------- 通用章节 ---------- */

.page-about__sec {
  padding-top: var(--about-gap);
  padding-bottom: var(--about-gap);
}

.page-about__sec + .page-about__sec {
  border-top: 1px solid var(--line);
}

.page-about__sec-grid {
  display: grid;
  gap: 26px;
}

.page-about__sec-head {
  position: relative;
}

.page-about__sec-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 8vw, 68px);
  font-weight: 700;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1.4px var(--turf);
  margin-bottom: 10px;
  letter-spacing: -0.03em;
}

.page-about__sec-head h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin: 0;
  color: var(--ink-blue);
}

.page-about__sec-sub {
  margin: 12px 0 0;
  font-size: 15px;
  color: var(--note);
  line-height: 1.8;
}

.page-about__sec-body {
  max-width: 68ch;
}

.page-about__sec-body p {
  font-size: 17px;
  line-height: var(--about-lead);
  color: var(--ink-blue);
  margin: 0 0 18px;
}

.page-about__sec-body p:last-child {
  margin-bottom: 0;
}

.page-about__lead {
  font-size: 19px !important;
  font-weight: 600;
  color: var(--turf-deep) !important;
}

/* ---------- 图片 ---------- */

.page-about__figure-wide,
.page-about__figure-break {
  margin: 0 0 26px;
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about__figure-wide img,
.page-about__figure-break img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 团队角色卡 ---------- */

.page-about__roles {
  display: grid;
  gap: 16px;
  margin: 26px 0 26px;
}

.page-about__role {
  position: relative;
  border-radius: var(--radius);
  padding: 22px 22px 24px;
  background: linear-gradient(155deg, var(--turf) 0%, var(--turf-deep) 100%);
  color: var(--chalk);
  transition: transform var(--base) var(--ease), box-shadow var(--base) var(--ease);
  outline-offset: 4px;
}

.page-about__role:nth-child(2) {
  background: linear-gradient(155deg, var(--indigo) 0%, var(--ink-blue) 100%);
}

.page-about__role:hover,
.page-about__role:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 18px 34px -18px rgba(11, 31, 51, 0.55);
}

.page-about__role-front .tag {
  background: rgba(247, 250, 248, 0.16);
  color: var(--chalk);
}

.page-about__role-count {
  font-family: var(--font-mono);
  font-size: clamp(40px, 9vw, 56px);
  font-weight: 700;
  line-height: 1;
  margin: 14px 0 0;
  letter-spacing: -0.03em;
}

.page-about__role-count span {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  margin-left: 8px;
  opacity: 0.78;
  letter-spacing: 0.06em;
}

.page-about__role-back {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(247, 250, 248, 0.24);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height var(--slow) var(--ease), opacity var(--base) var(--ease);
}

.page-about__role-back p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 250, 248, 0.88);
}

.page-about__role:hover .page-about__role-back,
.page-about__role:focus-visible .page-about__role-back,
.page-about__role:focus-within .page-about__role-back {
  max-height: 220px;
  opacity: 1;
}

/* ---------- 深色历程区 ---------- */

.page-about__sec--ink {
  background:
    radial-gradient(90% 60% at 10% 0%, rgba(46, 42, 110, 0.55), transparent 60%),
    var(--ink-blue);
  border-top: none !important;
  border-radius: var(--radius);
  margin-top: var(--about-gap);
  margin-bottom: var(--about-gap);
}

.page-about__sec--ink .page-about__sec-head h2 {
  color: var(--chalk);
}

.page-about__sec--ink .page-about__sec-num {
  -webkit-text-stroke-color: rgba(20, 224, 200, 0.7);
}

.page-about__sec--ink .page-about__sec-sub {
  color: rgba(247, 250, 248, 0.62);
}

.page-about__tl {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
}

.page-about__tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 0 0 34px 26px;
}

.page-about__tl-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--whistle);
  box-shadow: 0 0 0 4px rgba(255, 201, 60, 0.18);
}

.page-about__tl-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 26px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(20, 224, 200, 0.6), rgba(20, 224, 200, 0.08));
}

.page-about__tl-item:last-child::before {
  display: none;
}

.page-about__tl-item:last-child {
  padding-bottom: 0;
}

.page-about__tl-year {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about__tl-body h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--chalk);
  margin: 4px 0 8px;
}

.page-about__tl-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(247, 250, 248, 0.72);
  max-width: 56ch;
}

.page-about__sec--ink .page-about__figure-break {
  margin-top: 40px;
  margin-bottom: 0;
}

.page-about__sec--ink .media__caption {
  color: rgba(247, 250, 248, 0.55);
}

/* ---------- 数据来源 ---------- */

.page-about__src {
  list-style: none;
  margin: 24px 0 26px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about__src-item {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 4px 14px;
  align-items: start;
  padding: 18px 18px 20px;
  border-radius: var(--radius-sm);
  background: var(--chalk);
  border: 1px solid var(--line);
  border-left: 3px solid var(--turf);
}

.page-about__src-idx {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--turf);
  line-height: 1.2;
}

.page-about__src-item h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  margin: 0;
  color: var(--ink-blue);
}

.page-about__src-item p {
  margin: 0 !important;
  font-size: 15px !important;
  line-height: 1.85 !important;
  color: var(--note) !important;
  max-width: 52ch;
}

/* ---------- 荣誉折叠 ---------- */

.page-about__honor {
  border-left: 3px solid var(--whistle);
  padding-left: 16px;
  margin-bottom: 14px;
}

.page-about__honor .disclosure__panel p {
  font-size: 15px;
  line-height: 1.9;
}

/* ---------- 联系 ---------- */

.page-about__sec--join .page-about__sec-body {
  padding-left: 0;
}

.page-about__reach {
  margin: 24px 0 20px;
  display: grid;
  gap: 12px;
  padding: 20px 20px 22px;
  border-radius: var(--radius);
  background: rgba(18, 138, 75, 0.05);
  border: 1px solid var(--line);
}

.page-about__reach-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

.page-about__reach-row dt {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--note);
}

.page-about__reach-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--ink-blue);
  word-break: break-word;
}

.page-about__reach-row dd a {
  color: var(--turf-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 桌面 ---------- */

@media (min-width: 720px) {
  .page-about__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about__roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about__src-item {
    grid-template-columns: 52px 1fr;
  }

  .page-about__reach-row {
    grid-template-columns: 132px 1fr;
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 960px) {
  .page-about__sec-grid {
    grid-template-columns: minmax(220px, 320px) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about__sec-head {
    position: sticky;
    top: 32px;
  }

  .page-about__sec--ink .wrap {
    padding-left: 0;
    padding-right: 0;
  }

  .page-about__tl {
    margin-top: 44px;
  }

  .page-about__tl-item {
    grid-template-columns: 96px 1fr;
    gap: 26px;
    padding-left: 30px;
    padding-bottom: 44px;
  }

  .page-about__tl-year {
    font-size: 22px;
  }

  .page-about__figure-wide {
    margin-bottom: 34px;
  }

  .page-about__sec--ink {
    padding-left: clamp(24px, 5vw, 72px);
    padding-right: clamp(24px, 5vw, 72px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about__role,
  .page-about__role-back {
    transition: none;
  }

  .page-about__role:hover,
  .page-about__role:focus-visible {
    transform: none;
  }
}