.page-about {
  --about-accent-line: 3px;
  padding-bottom: var(--sp-6);
  background-image:
    radial-gradient(1100px 520px at 88% -10%, rgba(245, 165, 36, .10), transparent 62%),
    radial-gradient(760px 420px at -6% 34%, rgba(35, 224, 176, .06), transparent 62%);
  background-repeat: no-repeat;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  margin: var(--sp-4) 0 var(--sp-3);
}

.page-about .about-crumb-sep {
  margin: 0 8px;
  color: var(--muted);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: var(--sp-4) var(--sp-3) var(--sp-4);
  background:
    linear-gradient(90deg, var(--amber) 0 var(--about-accent-line), transparent var(--about-accent-line)) left top / var(--about-accent-line) 100% no-repeat,
    repeating-linear-gradient(90deg, rgba(245, 165, 36, .55) 0 22px, transparent 22px 44px) left top / 100% 3px no-repeat,
    linear-gradient(155deg, #111C3A 0%, #070C1B 68%);
}

.page-about .about-hero-grid {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-3);
}

.page-about h1 {
  margin: 0 0 var(--sp-3);
  max-width: 21ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.2vw, 54px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--sp-2);
  background: rgba(14, 23, 48, .94);
}

.page-about .about-stat-num {
  font-family: var(--font-data);
  font-size: clamp(24px, 5.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-stat-key {
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero-foot {
  margin: var(--sp-4) 0 0;
  padding-top: var(--sp-2);
  border-top: 1px dashed var(--line);
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  overflow-wrap: anywhere;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-block {
  margin-top: var(--sp-6);
}

.page-about .about-block-head {
  max-width: 70ch;
  margin-bottom: var(--sp-4);
}

/* ---------- 通用图版 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: var(--layer);
}

.page-about .about-figure .media-caption {
  margin-top: var(--sp-1);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 版本长卷 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: var(--sp-4);
}

.page-about .about-years {
  display: grid;
  gap: 2px;
  align-content: start;
}

.page-about .about-year {
  display: block;
  padding: 6px 0 6px 10px;
  border-left: 2px solid var(--line);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-year:hover,
.page-about .about-year:focus-visible {
  color: var(--amber-soft);
  border-left-color: var(--amber);
}

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

.page-about .about-version {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: var(--sp-3);
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--line);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-version:hover {
  background: rgba(245, 165, 36, .05);
}

.page-about .about-v-badge {
  align-self: start;
  display: block;
  padding: 4px 0;
  border-radius: var(--r-s);
  background: var(--amber);
  color: #0A1224;
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  text-align: center;
  letter-spacing: .05em;
}

.page-about .about-v-badge--now {
  background: var(--gain);
}

.page-about .about-v-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(17px, 3.6vw, 20px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-v-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #C4CFE6;
}

.page-about .about-figure--rail .media-caption {
  margin-top: var(--sp-2);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  gap: var(--sp-4);
}

.page-about .about-chart-wrap {
  position: relative;
  max-width: 300px;
  margin: 0 auto;
}

.page-about .about-ring {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-ring-track {
  fill: none;
  stroke: var(--line);
  stroke-width: 14;
}

.page-about .about-ring-seg {
  fill: none;
  stroke-width: 14;
  transform: rotate(-90deg);
  transform-origin: 70px 70px;
  transition: opacity var(--dur) var(--ease), stroke-width var(--dur) var(--ease);
}

.page-about .about-ring-seg--data { stroke: var(--amber); }
.page-about .about-ring-seg--edit { stroke: var(--muted); }
.page-about .about-ring-seg--prod { stroke: var(--teal); }

.page-about .about-chart-wrap:hover .about-ring-seg {
  opacity: .42;
  stroke-width: 12;
}

.page-about .about-chart-wrap:hover .about-ring-seg:hover {
  opacity: 1;
  stroke-width: 17;
}

.page-about .about-ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin: 0;
  pointer-events: none;
}

.page-about .about-ring-num {
  font-family: var(--font-data);
  font-size: clamp(34px, 8vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-ring-unit {
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--muted);
}

.page-about .about-chart-note {
  margin: var(--sp-2) 0 0;
  font-size: 13px;
  line-height: 1.7;
  text-align: center;
  color: var(--muted);
}

.page-about .about-team-list {
  display: grid;
  gap: var(--sp-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 4px var(--sp-2);
  padding: var(--sp-3) var(--sp-2) var(--sp-3) var(--sp-3);
  border: 1px solid var(--line);
  border-left-width: var(--about-accent-line);
  border-radius: var(--r-m);
  background: linear-gradient(180deg, rgba(14, 23, 48, .92), rgba(7, 12, 27, .92));
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-team-item:hover {
  border-color: var(--amber);
  box-shadow: var(--shadow-card);
}

.page-about .about-team-item--data { border-left-color: var(--amber); }
.page-about .about-team-item--edit { border-left-color: var(--muted); }
.page-about .about-team-item--prod { border-left-color: var(--teal); }

.page-about .about-team-count {
  font-family: var(--font-data);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-team-item--edit .about-team-count { color: var(--muted); }
.page-about .about-team-item--prod .about-team-count { color: var(--gain); }

.page-about .about-team-item:hover .about-team-count {
  transform: scale(1.06);
}

.page-about .about-team-role {
  align-self: center;
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team-desc {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: #C4CFE6;
}

/* ---------- 准则与节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  gap: var(--sp-4);
}

.page-about .about-cadence-copy {
  display: grid;
  gap: var(--sp-3);
  align-content: start;
}

.page-about .about-rule-card,
.page-about .about-note-card {
  padding: var(--sp-3);
  border-left: var(--about-accent-line) solid var(--amber);
}

.page-about .about-note-card {
  border-left-color: var(--gain);
}

.page-about .about-card-lede {
  margin: var(--sp-2) 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: #C4CFE6;
}

.page-about .about-rule-list {
  display: grid;
  gap: 10px;
  margin: var(--sp-3) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rule-list li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 12px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-rule-list li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 9px;
  border-radius: 2px;
  background: var(--amber);
}

.page-about .about-note-card .about-rule-list li::before {
  background: var(--gain);
}

/* ---------- 协作与认可 ---------- */
.page-about .about-eco {
  display: grid;
  gap: var(--sp-3);
}

.page-about .about-eco-card {
  padding: var(--sp-3);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: linear-gradient(180deg, rgba(14, 23, 48, .95), rgba(7, 12, 27, .95));
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-eco-card:hover {
  border-color: var(--amber);
}

.page-about .about-eco-num {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(44px, 11vw, 62px);
  font-weight: 700;
  line-height: 1;
}

.page-about .about-eco-card--amber .about-eco-num { color: var(--amber); }
.page-about .about-eco-card--gain .about-eco-num { color: var(--gain); }

.page-about .about-eco-kicker {
  margin: var(--sp-1) 0 var(--sp-2);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-eco-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #C4CFE6;
}

.page-about .about-award {
  padding: var(--sp-3);
  border: 1px solid var(--line);
  border-left: var(--about-accent-line) solid var(--amber);
  border-radius: var(--r-m);
  background: rgba(14, 23, 48, .74);
}

.page-about .about-award-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-award-list {
  display: grid;
  gap: var(--sp-3);
  margin: var(--sp-3) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-award-year {
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid var(--amber);
  border-radius: var(--r-s);
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--amber-soft);
}

.page-about .about-award-list p {
  margin: var(--sp-1) 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: #C4CFE6;
}

/* ---------- 服务范围 ---------- */
.page-about .about-area {
  display: grid;
  gap: var(--sp-4);
}

.page-about .about-area-list {
  display: grid;
  gap: var(--sp-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-area-list li {
  padding-left: var(--sp-3);
  border-left: 2px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-area-list li:hover {
  border-left-color: var(--amber);
}

.page-about .about-area-key {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--amber-soft);
}

.page-about .about-area-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #C4CFE6;
}

/* ---------- 结尾邀请 ---------- */
.page-about .about-cta {
  padding: var(--sp-4) var(--sp-3);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background:
    linear-gradient(120deg, rgba(245, 165, 36, .14) 0%, rgba(14, 23, 48, .92) 42%, rgba(7, 12, 27, .96) 100%);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-3);
}

.page-about .about-cta-mail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: var(--sp-3) 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  overflow-wrap: anywhere;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: var(--sp-5) var(--sp-4) var(--sp-4);
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-award {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, .6fr);
    align-items: end;
  }

  .page-about .about-team {
    grid-template-columns: 320px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team-list {
    grid-column: 1 / -1;
  }

  .page-about .about-figure--square {
    grid-column: 1 / -1;
    max-width: 520px;
  }

  .page-about .about-cadence {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }

  .page-about .about-area {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline {
    grid-template-columns: 76px minmax(0, 1fr) 288px;
    gap: var(--sp-4);
    align-items: start;
  }

  .page-about .about-years {
    position: sticky;
    top: var(--sp-4);
  }

  .page-about .about-figure--rail {
    position: sticky;
    top: var(--sp-4);
  }

  .page-about .about-team {
    grid-template-columns: 320px minmax(0, 1fr) 260px;
    align-items: center;
  }

  .page-about .about-team-list {
    grid-column: auto;
  }

  .page-about .about-figure--square {
    grid-column: auto;
    max-width: none;
  }
}