.page-about {
  --about-pad: clamp(56px, 10vh, 118px);
  --about-hair: rgba(42, 74, 68, .55);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(56px, 10vh, 120px) 0 clamp(52px, 9vh, 100px);
}

.page-about .about-hero-glow {
  position: absolute;
  top: -20%;
  right: -16%;
  width: min(92vw, 800px);
  aspect-ratio: 1 / 1;
  background: linear-gradient(155deg, var(--deep-a) 0%, var(--deep-b) 58%, rgba(7, 17, 15, 0) 100%);
  clip-path: polygon(46% 0, 100% 0, 100% 60%, 0 100%);
  opacity: .92;
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-index {
  margin: 26px 0 0;
  color: var(--amber);
}

.page-about .about-hero-title {
  margin: 16px 0 0;
  max-width: 17ch;
  font-size: clamp(36px, 7.2vw, 92px);
  font-weight: 200;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-hero-title strong {
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--cyan);
}

.page-about .about-hero-lede {
  margin: 26px 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.8;
  color: var(--sage);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(34px, 6vh, 64px) 0 0;
  max-width: 840px;
  background: var(--edge);
  border: 1px solid var(--edge);
}

.page-about .hero-stat {
  background: var(--ink);
  padding: 18px 18px 20px;
}

.page-about .stat-value {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--mist);
  line-height: 1.1;
}

.page-about .stat-unit {
  margin-left: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--amber);
  letter-spacing: 0;
}

.page-about .stat-label {
  margin: 8px 0 0;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--sage);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .chapter-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .chapter-aside {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .chapter-aside .index-label {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .chapter-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--sage);
}

.page-about .chapter-title {
  margin: 0 0 26px;
  font-size: clamp(28px, 4.6vw, 58px);
  font-weight: 200;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--mist);
  max-width: 20ch;
}

.page-about .chapter-title strong {
  font-weight: 800;
  letter-spacing: -0.04em;
}

.page-about .chapter-body > p {
  margin: 0 0 18px;
  max-width: 64ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--sage);
}

.page-about .chapter-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 40px;
}

.page-about .chapter-cols p {
  margin: 0 0 20px;
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--sage);
}

.page-about .hl {
  color: var(--mist);
  font-weight: 500;
}

/* ---------- 图版 ---------- */
.page-about .media {
  margin: 0;
  border: 1px solid var(--edge);
  background: linear-gradient(150deg, var(--deep-a), var(--deep-b));
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

.page-about .chapter-figure {
  margin: 0 0 30px;
  aspect-ratio: 1400 / 900;
}

.page-about .chapter-figure img,
.page-about .timeline-figure img,
.page-about .coda-media img {
  height: 100%;
  object-fit: cover;
}

/* ---------- 流程条 ---------- */
.page-about .flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 34px 0 38px;
  background: var(--edge);
  border: 1px solid var(--edge);
}

.page-about .flow-step {
  background: var(--char);
  padding: 20px 18px 22px;
}

.page-about .step-idx {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .step-name {
  margin: 10px 0 6px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .step-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--sage);
}

/* ---------- 手风琴（角色 + 时间线复用） ---------- */
.page-about .accordion {
  border-top: 1px solid var(--about-hair);
}

.page-about .accordion-item {
  border-bottom: 1px solid var(--about-hair);
  position: relative;
}

.page-about .accordion-trigger {
  display: flex;
  align-items: baseline;
  gap: 16px;
  width: 100%;
  padding: 16px 0;
  background: none;
  border: 0;
  font: inherit;
  text-align: left;
  color: var(--mist);
  cursor: pointer;
  transition: color .24s var(--ease);
}

.page-about .accordion-trigger:hover,
.page-about .accordion-trigger:focus-visible {
  color: var(--cyan);
}

.page-about .accordion-trigger[aria-expanded="true"] {
  color: var(--cyan);
}

.page-about .role-name {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-about .role-hint {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--sage);
}

.page-about .accordion-trigger[aria-expanded="true"] .role-hint {
  color: var(--cyan);
}

.page-about .accordion-panel {
  padding: 0 0 20px;
}

.page-about .accordion-panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sage);
}

/* ---------- 时间线 ---------- */
.page-about .timeline-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 38px;
  list-style: none;
}

.page-about .timeline-rail {
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: 7px;
  width: 2px;
  color: var(--edge);
  pointer-events: none;
}

.page-about .timeline-node {
  position: relative;
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  top: 24px;
  left: -35px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(255, 179, 71, .16);
}

.page-about .tl-trigger {
  padding: 15px 0;
}

.page-about .tl-year {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--amber);
  min-width: 4ch;
}

.page-about .tl-name {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-about .tl-trigger .tag {
  margin-left: auto;
  align-self: center;
}

.page-about .tl-panel {
  padding: 0 0 20px 0;
}

.page-about .timeline-figure {
  aspect-ratio: 1200 / 800;
  align-self: start;
}

/* ---------- 伙伴数据 ---------- */
.page-about .partner-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 30px 0 26px;
  background: var(--edge);
  border: 1px solid var(--edge);
}

.page-about .partner-stat {
  background: var(--char);
  padding: 20px 20px 22px;
}

.page-about .cadence-note {
  margin: 0;
  padding-left: 18px;
  border-left: 2px solid var(--cyan);
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--sage);
}

/* ---------- 三件事 ---------- */
.page-about .principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .principle {
  position: relative;
  padding-top: 22px;
  border-top: 1px solid var(--about-hair);
}

.page-about .principle::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 56px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 224, 200, 0));
}

.page-about .principle-no {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .principle-title {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .principle p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--sage);
}

/* ---------- 收束图版 ---------- */
.page-about .about-coda {
  padding: 0 0 var(--about-pad);
}

.page-about .coda-media {
  aspect-ratio: 1600 / 700;
}

.page-about .coda-note {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sage);
}

/* ---------- 联系 ---------- */
.page-about .contact-card {
  margin: 30px 0 0;
  padding: clamp(22px, 3vw, 34px);
}

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

.page-about .contact-list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .contact-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .contact-key {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--sage);
}

.page-about .contact-val {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--mist);
  word-break: break-word;
}

.page-about .contact-note {
  margin: 20px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--about-hair);
  font-size: 14px;
  line-height: 1.8;
  color: var(--sage);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .contact-list li {
    grid-template-columns: 116px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }
}

@media (min-width: 860px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 34px;
  }
}

@media (min-width: 960px) {
  .page-about .chapter-grid {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 84px);
  }

  .page-about .chapter-aside {
    flex-direction: column;
    gap: 10px;
    position: sticky;
    top: calc(var(--frame-top) + 28px);
    align-self: start;
  }

  .page-about .chapter-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 52px;
  }

  .page-about .chapter-cols p:nth-child(odd) {
    padding-right: 6px;
  }

  .page-about .chapter-cols p:nth-child(even) {
    transform: translateY(28px);
  }

  .page-about .timeline-wrap {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-hero-lede {
    margin-left: clamp(0px, 6vw, 96px);
  }
}

@media (min-width: 1280px) {
  .page-about .chapter-grid {
    grid-template-columns: 172px minmax(0, 1fr);
  }

  .page-about .about-chapter--partners .chapter-body {
    padding-right: clamp(0px, 4vw, 60px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .accordion-trigger {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>
<<<END>>>