.page-about {
  --about-panel-pad: clamp(20px, 3vw, 32px);
  --about-line: var(--ink-700);
}

.page-about .breadcrumb {
  margin-bottom: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 60px) clamp(20px, 4vw, 56px) clamp(32px, 5vw, 64px);
  border: 1px solid var(--about-line);
  clip-path: var(--cut);
  background:
    linear-gradient(122deg, rgba(31, 163, 107, 0.20) 0 20%, rgba(31, 163, 107, 0) 20.6%),
    linear-gradient(302deg, rgba(255, 107, 44, 0.16) 0 16%, rgba(255, 107, 44, 0) 16.6%),
    var(--ink-800);
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(28px, 5.2vw, 52px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.page-about .about-hero-lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: var(--step-3);
  line-height: 1.8;
  color: var(--paper-100);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 34px;
}

.page-about .about-hero-stats li {
  padding-left: 12px;
  border-left: 2px solid var(--turf-500);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.2;
  color: var(--paper-50);
}

.page-about .stat-label {
  display: block;
  margin-top: 2px;
  font-size: var(--step-1);
  letter-spacing: 0.1em;
  color: var(--grey-400);
}

.page-about .about-jump {
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 章节脊 ---------- */
.page-about .about-chapters {
  position: relative;
  margin-top: clamp(30px, 5vw, 60px);
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
}

.page-about .about-chapter {
  display: grid;
  gap: 12px;
  scroll-margin-top: calc(var(--header-h-compact) + 20px);
}

.page-about .about-spine-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 32px;
  background: var(--ink-900);
  border: 1px solid var(--about-line);
  font-family: var(--font-data);
  font-size: var(--step-2);
  letter-spacing: 0.08em;
  color: var(--grey-400);
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.page-about .about-chapter.is-active .about-spine-no {
  background: var(--turf-500);
  border-color: var(--turf-300);
  color: var(--ink-900);
}

/* ---------- 面板 ---------- */
.page-about .about-panel {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--about-line);
  border-radius: 0;
  box-shadow: var(--shadow-print);
  padding: var(--about-panel-pad);
  transition: border-color 0.3s ease;
}

.page-about .about-chapter.is-active .about-panel {
  border-color: var(--turf-500);
}

.page-about .about-panel-head {
  display: block;
  margin-bottom: clamp(14px, 2vw, 22px);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-panel-head .label {
  display: block;
  margin: 0 0 6px;
  color: var(--turf-300);
}

.page-about .about-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.page-about .about-text {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: var(--step-3);
  line-height: 1.8;
  color: var(--paper-100);
}

.page-about .about-text--tight {
  margin-top: 16px;
  font-size: var(--step-2);
  color: var(--grey-400);
}

.page-about .about-note {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--signal-200);
  background: rgba(255, 211, 184, 0.06);
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--paper-100);
}

.page-about .about-sub {
  margin: 0 0 12px;
  font-family: var(--font-panel);
  font-size: var(--step-2);
  letter-spacing: 0.1em;
  color: var(--turf-300);
}

.page-about .about-sub--no {
  color: var(--signal-200);
}

.page-about .about-split {
  display: grid;
  gap: 22px;
}

.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 18px;
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--paper-100);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  background: var(--turf-500);
}

.page-about .about-list--no li::before {
  background: var(--signal-500);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-leagues {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(132px, 1fr));
  gap: 8px;
  margin: 4px 0 clamp(18px, 3vw, 28px);
}

.page-about .about-leagues > .league-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--about-line);
  background: var(--ink-900);
  font-family: var(--font-panel);
  font-size: var(--step-2);
  letter-spacing: 0.06em;
  color: var(--paper-100);
}

.page-about .about-field-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
}

.page-about .about-field-table th,
.page-about .about-field-table td {
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  font-size: var(--step-2);
  line-height: 1.65;
}

.page-about .about-field-table th {
  font-family: var(--font-panel);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
  color: var(--grey-400);
}

.page-about .about-field-table td:first-child {
  font-family: var(--font-data);
  white-space: nowrap;
  color: var(--paper-50);
}

.page-about .about-split--media {
  margin-top: clamp(20px, 3vw, 32px);
}

/* ---------- 媒体框 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--ink-900);
}

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

.page-about .about-figure figcaption {
  padding: 10px 12px;
  border-top: 1px solid var(--about-line);
  font-size: var(--step-1);
  letter-spacing: 0.04em;
  color: var(--grey-400);
}

/* ---------- 流程 ---------- */
.page-about .flow-board {
  margin-top: 6px;
}

.page-about .flow-scroll {
  overflow-x: auto;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .flow-svg {
  display: block;
  width: 100%;
  min-width: 720px;
  height: auto;
}

.page-about .flow-svg text {
  font-family: var(--font-data);
  font-size: 13px;
  fill: var(--paper-50);
}

.page-about .flow-svg .flow-num {
  font-size: 11px;
  letter-spacing: 0.08em;
  fill: var(--grey-400);
}

.page-about .flow-svg .flow-node {
  fill: var(--ink-900);
  stroke: var(--about-line);
  stroke-width: 1.5;
}

.page-about .flow-svg .flow-node--end {
  stroke: var(--turf-500);
}

.page-about .flow-svg .flow-line {
  stroke: var(--about-line);
  stroke-width: 1.5;
  fill: none;
}

.page-about .about-flow-split {
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .flow-step {
  border: 1px solid var(--about-line);
  background: var(--ink-900);
  transition: border-color 0.3s ease;
}

.page-about .flow-step[open] {
  border-color: var(--turf-500);
}

.page-about .flow-step > summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  list-style: none;
  cursor: pointer;
}

.page-about .flow-step > summary::-webkit-details-marker {
  display: none;
}

.page-about .flow-step > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  color: var(--grey-400);
}

.page-about .flow-step[open] > summary::after {
  content: "–";
  color: var(--turf-300);
}

.page-about .flow-step-no {
  font-family: var(--font-data);
  font-size: var(--step-2);
  color: var(--turf-300);
}

.page-about .flow-step-name {
  font-family: var(--font-panel);
  font-size: var(--step-3);
  letter-spacing: 0.04em;
  color: var(--paper-50);
}

.page-about .flow-step p {
  margin: 0;
  padding: 0 14px 14px;
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--paper-100);
}

/* ---------- 指标 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
}

.page-about .metric-card {
  padding: 16px;
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--turf-500);
  background: var(--ink-900);
}

.page-about .metric-card--signal {
  border-top-color: var(--signal-500);
}

.page-about .metric-value {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.2;
  color: var(--paper-50);
}

.page-about .metric-name {
  display: block;
  margin-top: 6px;
  font-size: var(--step-2);
  color: var(--paper-100);
}

.page-about .metric-note {
  display: block;
  margin-top: 4px;
  font-size: var(--step-1);
  line-height: 1.6;
  color: var(--grey-400);
}

/* ---------- 团队台账 ---------- */
.page-about .about-ledger {
  border-top: 1px solid var(--about-line);
}

.page-about .about-ledger .ledger-row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .ledger-key {
  font-family: var(--font-panel);
  font-size: var(--step-2);
  letter-spacing: 0.1em;
  color: var(--turf-300);
}

.page-about .ledger-val {
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--paper-100);
}

/* ---------- 更正步骤 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: fix;
}

.page-about .about-steps li {
  position: relative;
  padding: 12px 14px 12px 54px;
  border: 1px solid var(--about-line);
  background: var(--ink-900);
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--paper-100);
}

.page-about .about-steps li::before {
  counter-increment: fix;
  content: counter(fix, decimal-leading-zero);
  position: absolute;
  left: 14px;
  top: 12px;
  font-family: var(--font-data);
  font-size: var(--step-2);
  color: var(--signal-500);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 运营信息 ---------- */
.page-about .about-info {
  margin: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-info-row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-info dt {
  font-family: var(--font-panel);
  font-size: var(--step-1);
  letter-spacing: 0.12em;
  color: var(--grey-400);
}

.page-about .about-info dd {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.7;
  color: var(--paper-50);
  overflow-wrap: anywhere;
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-links a {
  font-size: var(--step-2);
  color: var(--paper-100);
  text-decoration: none;
  border-bottom: 1px dashed var(--grey-400);
  padding-bottom: 2px;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  color: var(--turf-300);
  border-bottom-color: var(--turf-300);
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 760px) {
  .page-about .about-split {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .page-about .about-split--media {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-flow-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .about-info-row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }

  .page-about .about-ledger .ledger-row {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapters::before {
    content: "";
    position: absolute;
    left: 25px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: var(--about-line);
  }

  .page-about .about-chapter {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .about-spine {
    position: sticky;
    top: calc(var(--header-h-compact) + 24px);
    display: flex;
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-spine-no,
  .page-about .about-panel,
  .page-about .flow-step,
  .page-about .about-links a {
    transition: none;
  }
}
<<<END>>>