.page-about {
  --about-shadow: 0 18px 34px -28px rgba(34, 30, 27, 0.6);
  background: var(--cream);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about :focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(16px, 3vw, 26px);
  font-size: 13px;
  color: var(--slate);
}

.page-about .crumbs a {
  color: var(--green);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .crumbs-sep {
  color: var(--line-2);
}

/* ---------- 封面首屏 ---------- */
.page-about .about-cover {
  position: relative;
  padding: clamp(22px, 4vw, 46px) 0 clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-cover::before {
  content: "WH";
  position: absolute;
  top: -0.3em;
  right: -0.06em;
  font-family: var(--font-mono);
  font-size: clamp(120px, 26vw, 300px);
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(20, 81, 47, 0.07);
  pointer-events: none;
  user-select: none;
}

.page-about .about-cover-grid {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange-deep);
}

.page-about .about-cover h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.6vw, 62px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-about .lede {
  margin: 16px 0 0;
  font-size: clamp(15px, 2.2vw, 19px);
  line-height: 1.75;
  color: var(--ink-2);
  max-width: 52ch;
}

.page-about .cover-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 22px 0 0;
}

.page-about .cover-meta span {
  padding: 5px 12px;
  border: 1px solid rgba(20, 81, 47, 0.25);
  border-radius: var(--pill);
  background: rgba(20, 81, 47, 0.05);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--green);
}

.page-about .cover-index {
  display: grid;
  border-top: 1px solid var(--line-2);
}

.page-about .cover-index a {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 12px 4px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
  transition: background-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .cover-index a:hover {
  background: rgba(232, 223, 206, 0.6);
  color: var(--green);
}

.page-about .cover-index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange-deep);
}

.page-about .cover-index-text {
  font-size: 15px;
}

/* ---------- 章节节奏与色带 ---------- */
.page-about .about-band {
  padding: clamp(36px, 6.5vw, 76px) 0;
}

.page-about .about-band--paper {
  background: var(--cream-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-band--green {
  background: var(--green);
  border-top: 1px solid var(--green-deep);
  border-bottom: 1px solid var(--green-deep);
  color: var(--cream);
}

.page-about .section-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .section-mark-num {
  font-weight: 600;
  color: var(--orange-deep);
}

.page-about .section-mark-dash {
  display: inline-block;
  width: 26px;
  height: 1px;
  background: var(--line-2);
}

.page-about .about-band h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.015em;
}

.page-about .about-band p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-2);
  max-width: 60ch;
}

.page-about .about-band--green .section-mark {
  color: rgba(245, 240, 230, 0.72);
}

.page-about .about-band--green .section-mark-num {
  color: var(--lime);
}

.page-about .about-band--green .section-mark-dash {
  background: rgba(245, 240, 230, 0.4);
}

.page-about .about-band--green h2 {
  color: var(--cream);
}

.page-about .about-band--green p {
  color: rgba(245, 240, 230, 0.84);
}

/* ---------- 非对称分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .media-frame {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: linear-gradient(140deg, var(--paper), var(--cream-2));
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-caption {
  margin: 10px 2px 0;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--slate);
}

/* ---------- 编号示例 ---------- */
.page-about .code-block {
  margin-top: clamp(20px, 3vw, 28px);
  padding: clamp(16px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--cream-2);
}

.page-about .about-band--paper .code-block {
  background: var(--cream);
}

.page-about .code-block-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .code-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 3.6vw, 26px);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-about .code-seg {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: var(--paper);
  scroll-margin-top: 110px;
  transition: background-color 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .code-seg:hover,
.page-about .code-seg:target {
  background: var(--lime);
  border-color: var(--ink);
  color: var(--ink);
}

.page-about .code-dash {
  color: var(--slate);
}

.page-about .code-legend {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .code-legend a {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--r-md);
  background: rgba(232, 223, 206, 0.55);
  text-decoration: none;
  color: var(--ink-2);
  transition: background-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-band--paper .code-legend a {
  background: rgba(232, 223, 206, 0.75);
}

.page-about .code-legend a:hover {
  background: var(--paper);
  color: var(--ink);
}

.page-about .code-legend-code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--green);
}

.page-about .code-legend-note {
  font-size: 14px;
  line-height: 1.6;
}

.page-about .code-hint {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

/* ---------- 赛区条带与清单 ---------- */
.page-about .zone-note {
  align-self: end;
}

.page-about .zone-note .label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .zone-note p + p {
  margin-top: 8px;
}

.page-about .zone-band {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: clamp(20px, 3.4vw, 34px);
}

.page-about .zone-band-seg {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  border-radius: var(--pill);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: filter 180ms var(--ease);
}

.page-about .zone-band-seg:hover {
  filter: brightness(1.08);
}

.page-about .zone-band-name {
  font-family: var(--font-display);
  font-weight: 700;
}

.page-about .zone-band-num {
  font-family: var(--font-mono);
  font-size: 12px;
  opacity: 0.92;
}

.page-about .zone-band-seg--c { background: var(--zone-c); color: var(--cream); }
.page-about .zone-band-seg--s { background: var(--zone-s); color: var(--cream); }
.page-about .zone-band-seg--w { background: var(--zone-w); color: var(--ink); }
.page-about .zone-band-seg--e { background: var(--zone-e); color: var(--cream); }
.page-about .zone-band-seg--o { background: var(--zone-o); color: var(--cream); }

.page-about .zone-list {
  display: grid;
  gap: 10px;
  margin-top: clamp(22px, 3.6vw, 36px);
}

.page-about .zone-item {
  scroll-margin-top: 100px;
  border: 1px solid var(--line);
  border-left-width: 4px;
  border-radius: var(--r-lg);
  background: var(--cream);
  overflow: hidden;
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .zone-item:target {
  border-color: var(--green);
  box-shadow: 0 0 0 2px rgba(20, 81, 47, 0.16);
}

.page-about .zone-item--c { border-left-color: var(--zone-c); }
.page-about .zone-item--s { border-left-color: var(--zone-s); }
.page-about .zone-item--w { border-left-color: var(--zone-w); }
.page-about .zone-item--e { border-left-color: var(--zone-e); }
.page-about .zone-item--o { border-left-color: var(--zone-o); }

.page-about .zone-trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  width: 100%;
  padding: 16px clamp(16px, 3vw, 20px);
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .zone-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .zone-line {
  flex: 1 1 180px;
  font-size: 14px;
  color: var(--slate);
}

.page-about .zone-count {
  margin-left: auto;
  padding: 3px 10px;
  border-radius: var(--pill);
  background: var(--paper);
  font-size: 12px;
  color: var(--ink);
}

.page-about .zone-trigger .accordion-icon {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border: 1px solid var(--line-2);
  border-radius: 50%;
}

.page-about .zone-trigger .accordion-icon::before,
.page-about .zone-trigger .accordion-icon::after {
  content: "";
  position: absolute;
  left: 3px;
  right: 3px;
  top: 50%;
  height: 1.5px;
  background: var(--ink-2);
  transform: translateY(-50%);
}

.page-about .zone-trigger .accordion-icon::after {
  transform: translateY(-50%) rotate(90deg);
  transition: transform 220ms var(--ease), opacity 220ms var(--ease);
}

.page-about .zone-trigger[aria-expanded="true"] .accordion-icon::after {
  transform: translateY(-50%) rotate(0deg);
  opacity: 0;
}

.page-about .about-band .zone-panel-inner {
  padding: 0 clamp(16px, 3vw, 20px) 18px;
}

.page-about .about-band .zone-panel-inner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .zone-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .zone-tags li {
  padding: 5px 12px;
  border-radius: var(--pill);
  background: var(--paper);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-2);
}

.page-about .zone-figure {
  margin-top: clamp(26px, 4vw, 48px);
}

/* ---------- 统计口径（深绿面板） ---------- */
.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .stat-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.6vw, 22px);
  border: 1px solid var(--line-cream);
  border-radius: var(--r-lg);
  background: rgba(245, 240, 230, 0.08);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 7vw, 52px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.page-about .stat-label {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(245, 240, 230, 0.8);
}

.page-about .rule-panel {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line-cream);
  border-radius: var(--r-lg);
  background: rgba(14, 58, 34, 0.45);
}

.page-about .rule-panel .label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .rule-list {
  display: grid;
  gap: 14px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rule-list li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 240, 230, 0.88);
}

.page-about .rule-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(245, 240, 230, 0.6);
}

/* ---------- 复核时间轴 ---------- */
.page-about .flow {
  position: relative;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line-2);
}

.page-about .flow-item {
  position: relative;
  padding: 0 0 20px 36px;
}

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

.page-about .flow-dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 19px;
  height: 19px;
  border: 2px solid var(--slate);
  border-radius: 50%;
  background: var(--cream);
}

.page-about .flow-item--now .flow-dot {
  border-color: var(--orange-deep);
  background: var(--orange);
}

.page-about .flow-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-band .flow-text {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ---------- 阅读路径 ---------- */
.page-about .path-steps {
  display: grid;
  gap: 12px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .path-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: clamp(16px, 2.6vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--cream);
  box-shadow: var(--about-shadow);
}

.page-about .path-step-num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.2;
  color: var(--orange-deep);
}

.page-about .path-step-body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-band .path-step-body p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-2);
  max-width: 60ch;
}

.page-about .path-step-body a {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .link-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(24px, 3vw, 34px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line);
}

/* ---------- 响应式 ---------- */
@media (max-width: 479px) {
  .page-about .stat-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .code-legend a {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .zone-count {
    margin-left: 0;
  }
}

@media (min-width: 760px) {
  .page-about .zone-band {
    flex-direction: row;
    gap: 8px;
  }

  .page-about .zone-band-seg {
    flex: 1 1 auto;
    flex-direction: column;
    align-items: flex-start;
    justify-content: space-between;
    min-height: 108px;
    padding: 16px;
    border-radius: var(--r-md);
  }

  .page-about .zone-band-seg--c { flex: 148 1 0; }
  .page-about .zone-band-seg--s { flex: 126 1 0; }
  .page-about .zone-band-seg--w { flex: 94 1 0; }
  .page-about .zone-band-seg--e { flex: 112 1 0; }
  .page-about .zone-band-seg--o { flex: 62 1 0; }

  .page-about .path-step:nth-child(2) {
    margin-left: clamp(0px, 4vw, 46px);
  }

  .page-about .path-step:nth-child(3) {
    margin-left: clamp(0px, 8vw, 92px);
  }
}

@media (min-width: 900px) {
  .page-about .about-cover-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: end;
    gap: clamp(32px, 6vw, 72px);
  }

  .page-about .split-numbering {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(28px, 5vw, 60px);
  }

  .page-about .split-zones {
    grid-template-columns: minmax(0, 1.9fr) minmax(0, 0.9fr);
    align-items: end;
    gap: clamp(24px, 4vw, 52px);
  }

  .page-about .split-stats {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(28px, 5vw, 60px);
  }

  .page-about .split-stats > .rule-panel {
    margin-top: clamp(0px, 4vw, 56px);
  }

  .page-about .split-review {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.7fr);
    align-items: start;
    gap: clamp(28px, 5vw, 56px);
  }

  .page-about .split-figure {
    position: sticky;
    top: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}