/* ===== 关于看台 / page-about ===== */

.page-about .page-head {
  padding: clamp(28px, 5vw, 62px) 0 clamp(24px, 4vw, 46px);
}

.page-about .page-head .crumb {
  margin-bottom: 22px;
}

.page-about .page-head .eyebrow {
  margin-bottom: 12px;
}

.page-about .page-head .display {
  max-width: 13em;
  margin: 0 0 18px;
}

.page-about .page-head .lede {
  max-width: 34em;
  margin: 0;
  color: var(--ink);
}

.page-about .page-head::after {
  content: "";
  display: block;
  width: 76px;
  height: 8px;
  margin-top: 30px;
  background: var(--gold);
}

.page-about .head-jump {
  display: inline-block;
  margin-top: 22px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--red);
  background: var(--paper);
  border: var(--line) solid var(--red);
  box-shadow: 4px 4px 0 var(--red-dark);
  text-decoration: none;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .head-jump:hover {
  transform: translateY(-3px);
  background: var(--gold-light);
  box-shadow: 4px 7px 0 var(--red-dark);
}

.page-about .head-jump:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* 侧栏小注 */
.page-about .side-note {
  align-self: start;
  margin-top: 10px;
  padding-left: 18px;
  border-left: var(--line) solid var(--gold);
}

.page-about .side-note__text {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--red);
}

/* 区块说明行 */
.page-about .section__note {
  max-width: 34em;
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

/* 阶梯时间轴 */
.page-about .stage-figure {
  margin: 30px 0 42px;
}

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

.page-about .timeline-row {
  position: relative;
  display: grid;
  gap: 10px;
  margin-left: 8px;
  padding: 0 0 34px 26px;
  border-left: var(--line) solid var(--red);
}

.page-about .timeline-row:last-child {
  padding-bottom: 0;
}

.page-about .timeline-row::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 6px;
  width: 15px;
  height: 15px;
  background: var(--gold);
  border: var(--line) solid var(--red-dark);
}

.page-about .timeline-year {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .timeline-year__num {
  font-family: var(--font-num);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--red);
}

.page-about .timeline-year__tag {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .timeline-body__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--ink);
}

.page-about .timeline-body p {
  max-width: 34em;
  margin: 0 0 14px;
  color: var(--ink);
}

.page-about .details-panel {
  margin-top: 6px;
  border: var(--line) solid var(--red-dark);
  background: var(--paper);
}

.page-about .details-panel > summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--red);
  background: var(--cream);
  cursor: pointer;
  list-style: none;
}

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

.page-about .details-panel > summary::before {
  content: "+";
  font-family: var(--font-num);
  font-weight: 800;
  font-size: 17px;
  line-height: 1;
  color: var(--gold);
}

.page-about .details-panel[open] > summary::before {
  content: "–";
}

.page-about .details-panel__body {
  padding: 16px 18px;
  border-top: 1px solid var(--mist);
}

.page-about .details-panel__body ul {
  margin: 0;
  padding-left: 1.1em;
  display: grid;
  gap: 8px;
}

.page-about .details-panel__body li {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .details-panel:focus-within {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* 横向数据带 */
.page-about .stat-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: var(--line) solid var(--red-dark);
  background: var(--paper);
}

.page-about .stat-cell {
  padding: 22px 18px 24px;
  border-top: var(--line) solid var(--red-dark);
  border-left: var(--line) solid var(--red-dark);
}

.page-about .stat-cell:nth-child(1),
.page-about .stat-cell:nth-child(2) {
  border-top: 0;
}

.page-about .stat-cell:nth-child(1),
.page-about .stat-cell:nth-child(3) {
  border-left: 0;
}

.page-about .stat-cell:nth-child(1),
.page-about .stat-cell:nth-child(4) {
  background: var(--cream);
}

.page-about .stat-cell__num {
  display: block;
  font-family: var(--font-num);
  font-weight: 800;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--red);
}

.page-about .stat-cell__label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* 分工三块 */
.page-about .crew {
  display: grid;
  gap: 18px;
  margin-top: 36px;
}

.page-about .crew__block {
  padding: 22px 20px 24px;
  background: var(--paper);
  border: var(--line) solid var(--red-dark);
  box-shadow: var(--shadow);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .crew__block:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.page-about .crew__block--a {
  border-top: 10px solid var(--red);
  background: var(--cream);
}

.page-about .crew__block--b {
  border-top: 10px solid var(--gold);
}

.page-about .crew__block--c {
  border-top: 10px solid var(--mist);
}

.page-about .crew__role {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--paper);
  background: var(--red);
}

.page-about .crew__title {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .crew__block p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
}

.page-about .crew__foot {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--mist);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  opacity: 0.75;
  transition: opacity var(--dur) var(--ease);
}

.page-about .crew__block:hover .crew__foot,
.page-about .crew__block:focus-within .crew__foot {
  opacity: 1;
}

/* 核对节奏清单 */
.page-about .cadence-list {
  display: grid;
  margin-top: 28px;
  border-top: var(--line) solid var(--red-dark);
}

.page-about .cadence-item {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--mist);
}

.page-about .cadence-item__key {
  font-family: var(--font-num);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--red);
}

.page-about .cadence-item__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .cadence-item__desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .cadence-note {
  margin-top: 34px;
  padding: 22px 22px 24px;
  background: var(--paper);
  border-left: 10px solid var(--gold);
}

.page-about .cadence-note h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--red);
}

/* 两步路径 */
.page-about .band--red .eyebrow {
  color: var(--gold-light);
}

.page-about .band--red .headline {
  color: var(--paper);
}

.page-about .step-pair {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .step-pair__item {
  padding: 22px 20px 24px;
  background: var(--red-dark);
  border: var(--line) solid var(--gold);
  box-shadow: 6px 6px 0 var(--gold);
}

.page-about .step-pair__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-num);
  font-size: 38px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .step-pair__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .step-pair__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gold-light);
}

.page-about .step-pair__foot {
  margin: 30px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--gold);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--gold-light);
}

/* 收尾 */
.page-about .closing-figure {
  margin: 0 0 34px;
}

.page-about .closing-copy {
  align-items: start;
}

.page-about .closing-links {
  display: grid;
  align-self: start;
  border-top: var(--line) solid var(--red-dark);
}

.page-about .closing-links a {
  display: block;
  padding: 15px 4px;
  border-bottom: 1px solid var(--mist);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .closing-links a:hover {
  padding-left: 14px;
  background: var(--gold-light);
  color: var(--red-dark);
}

.page-about .closing-links a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

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

/* ===== 响应式 ===== */
@media (min-width: 720px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .stat-cell {
    border-top: 0;
  }

  .page-about .stat-cell:nth-child(3) {
    border-left: var(--line) solid var(--red-dark);
  }

  .page-about .cadence-item {
    grid-template-columns: 116px 176px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
    padding: 22px 0;
  }
}

@media (min-width: 820px) {
  .page-about .step-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px;
  }
}

@media (min-width: 860px) {
  .page-about .crew {
    grid-template-columns: 5fr 4fr 3fr;
    align-items: start;
  }

  .page-about .crew__block--b {
    margin-top: 24px;
  }

  .page-about .crew__block--c {
    margin-top: 48px;
  }
}

@media (min-width: 900px) {
  .page-about .timeline-row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 34px;
    padding-left: 34px;
  }

  .page-about .timeline-year {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .timeline-row:nth-child(2) {
    margin-left: 30px;
  }

  .page-about .timeline-row:nth-child(3) {
    margin-left: 60px;
  }

  .page-about .timeline-row:nth-child(4) {
    margin-left: 90px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .head-jump,
  .page-about .crew__block,
  .page-about .crew__foot,
  .page-about .closing-links a {
    transition: none;
  }

  .page-about .head-jump:hover,
  .page-about .crew__block:hover {
    transform: none;
  }
}
<<<END>>>