.page-about {
  --about-rail-w: 232px;
  display: block;
}

.page-about .about-crumb-wrap {
  padding-top: clamp(18px, 4vw, 34px);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 56px) 0 clamp(38px, 6vw, 80px);
  background:
    radial-gradient(110% 82% at 84% 4%, rgba(61, 224, 208, 0.10), transparent 58%),
    radial-gradient(88% 76% at 2% 0%, rgba(255, 107, 44, 0.13), transparent 60%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(140, 153, 184, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 153, 184, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 82%);
}

.page-about .edge-note {
  display: none;
  position: absolute;
  right: 12px;
  top: 46%;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--grey);
  opacity: 0.55;
  z-index: 1;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.012em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 56ch;
  color: var(--text-soft);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .board-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--glass-soft);
  backdrop-filter: blur(10px);
  transition: transform 0.32s var(--ease), border-color 0.32s var(--ease);
}

.page-about .board-cell:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
}

.page-about .board-cell--wide {
  grid-column: span 2;
}

.page-about .board-cell--accent {
  border-color: rgba(255, 107, 44, 0.42);
  background: linear-gradient(120deg, var(--orange-soft), rgba(20, 31, 61, 0.6));
}

.page-about .board-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .board-cell--accent .board-num {
  color: var(--amber);
}

.page-about .board-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- 运营历程 ---------- */

.page-about .about-history {
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.page-about .history-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 32px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .rail-list {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-soft);
  text-decoration: none;
  transition: border-color 0.28s var(--ease), color 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  background: var(--cyan-soft);
}

.page-about .rail-num {
  font-size: 11px;
  color: var(--grey);
}

.page-about .history-body {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.4vw, 22px);
  padding-left: 22px;
  border-left: 1px solid var(--line);
}

.page-about .history-node {
  position: relative;
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel-soft);
  backdrop-filter: blur(8px);
}

.page-about .history-node::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 28px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 44, 0.16);
}

.page-about .node-meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .node-title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 23px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .history-node p {
  margin: 0 0 10px;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.78;
}

.page-about .history-node p:last-child {
  margin-bottom: 0;
}

.page-about .history-node a,
.page-about .partner-copy a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 224, 208, 0.4);
}

.page-about .history-node a:hover,
.page-about .partner-copy a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 排序方法 ---------- */

.page-about .method-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .method-list {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .method-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--glass-soft);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .method-item:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.page-about .method-key {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--cyan-soft);
  color: var(--cyan);
  font-size: 14px;
  font-weight: 600;
}

.page-about .method-body h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .method-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--grey);
}

.page-about .method-figure,
.page-about .team-figure,
.page-about .partner-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-900);
}

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

.page-about .figure-cap {
  padding: 12px 16px 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--grey);
  border-top: 1px solid var(--line);
  background: var(--panel-soft);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: linear-gradient(180deg, var(--ink-900), var(--ink-800));
}

.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .team-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .role-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius-md);
  background: var(--panel-soft);
  transition: transform 0.32s var(--ease), border-color 0.32s var(--ease);
}

.page-about .role-card:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  border-left-color: var(--cyan);
}

.page-about .role-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .role-head h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .role-tag {
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--grey);
}

.page-about .role-card p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--text-soft);
}

/* ---------- 巡检与纠错 ---------- */

.page-about .check-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .check-card {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--glass-soft);
  backdrop-filter: blur(8px);
}

.page-about .check-card--accent {
  border-color: rgba(61, 224, 208, 0.36);
  background: linear-gradient(140deg, var(--cyan-soft), rgba(20, 31, 61, 0.72));
}

.page-about .check-num {
  display: block;
  font-size: 26px;
  font-weight: 600;
  color: var(--cyan);
  opacity: 0.75;
}

.page-about .check-card h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .check-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--text-soft);
}

/* ---------- 合作与覆盖 ---------- */

.page-about .about-partner {
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .partner-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .partner-copy .section-title {
  margin-bottom: 18px;
}

.page-about .partner-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .partner-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-about .pstat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel-soft);
}

.page-about .pstat .mono {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 600;
  color: var(--orange);
}

.page-about .pstat span:last-child {
  font-size: 12px;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- 访问节奏 ---------- */

.page-about .peak-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 30px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .peak-bars {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel-soft);
}

.page-about .peak-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-about .peak-label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-about .peak-track {
  display: block;
  height: 12px;
  border-radius: 999px;
  background: rgba(140, 153, 184, 0.16);
  overflow: hidden;
}

.page-about .peak-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.page-about .peak-fill--morning {
  width: 84%;
  background: linear-gradient(90deg, var(--orange), var(--amber));
}

.page-about .peak-fill--evening {
  width: 72%;
  background: linear-gradient(90deg, var(--cyan), #2b8fd8);
}

.page-about .peak-val {
  font-size: 12px;
  color: var(--grey);
}

.page-about .peak-note h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .peak-note p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.76;
  color: var(--text-soft);
}

.page-about .peak-note p:last-child {
  margin-bottom: 0;
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  background:
    radial-gradient(90% 120% at 88% 10%, rgba(255, 107, 44, 0.16), transparent 60%),
    var(--ink-900);
  border-top: 1px solid var(--line);
}

.page-about .next-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  align-items: center;
}

.page-about .next-copy p {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

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

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

  .page-about .peak-row {
    grid-template-columns: 132px minmax(0, 1fr) 96px;
    align-items: center;
    gap: 14px;
  }

  .page-about .peak-val {
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .edge-note {
    display: block;
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

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

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .partner-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  }

  .page-about .peak-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .next-shell {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

  .page-about .next-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .page-about .history-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 68px);
  }

  .page-about .history-rail {
    position: sticky;
    top: 112px;
    align-self: start;
  }

  .page-about .rail-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 4px;
  }

  .page-about .rail-list a {
    width: 100%;
    border-radius: var(--radius-sm);
    border-color: transparent;
    padding: 9px 12px;
  }

  .page-about .rail-list a:hover,
  .page-about .rail-list a:focus-visible {
    border-color: var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .board-cell,
  .page-about .method-item,
  .page-about .role-card {
    transition: none;
  }

  .page-about .board-cell:hover,
  .page-about .method-item:hover,
  .page-about .role-card:hover {
    transform: none;
  }
}