.page-about {
  --about-year-w: 88px;
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

@media (min-width: 900px) {
  .page-about {
    --about-year-w: 176px;
  }
}

.page-about .section {
  padding-block: clamp(52px, 7vw, 88px);
}

.page-about h2 {
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin-top: 14px;
  max-width: 22ch;
}

.page-about p {
  font-size: 16px;
  line-height: 1.6;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-green);
  color: var(--paper);
  padding: calc(var(--header-h) + 36px) 0 44px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  top: -140px;
  width: 340px;
  height: 340px;
  border: 1px solid rgba(201, 162, 74, 0.32);
  border-radius: 50%;
  pointer-events: none;
}

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

.page-about .about-crumbs .breadcrumb-link {
  color: var(--sand);
  opacity: 0.78;
}

.page-about .about-crumbs .breadcrumb-link:hover {
  opacity: 1;
}

.page-about .about-crumbs .breadcrumb-item {
  color: rgba(232, 220, 192, 0.6);
}

.page-about .about-crumbs .breadcrumb-item[aria-current="page"] {
  color: var(--gold);
}

.page-about .about-hero .section-label {
  color: var(--gold);
  margin-top: 26px;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 24px;
  margin-top: 18px;
}

.page-about .about-hero h1 {
  max-width: 16ch;
  margin-top: 14px;
}

.page-about .about-hero .lede {
  margin-top: 18px;
  max-width: 46ch;
  color: rgba(232, 220, 192, 0.82);
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.6;
}

.page-about .about-hero-side {
  border-left: 2px solid var(--gold);
  padding-left: 16px;
  color: rgba(232, 220, 192, 0.74);
  font-size: 15px;
  line-height: 1.65;
  max-width: 42ch;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
  margin-top: 38px;
  padding-top: 26px;
  border-top: 1px solid rgba(232, 220, 192, 0.22);
  list-style: none;
}

.page-about .about-fig-num {
  display: block;
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--gold);
  line-height: 1.1;
}

.page-about .about-fig-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(232, 220, 192, 0.7);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 56px) 0 56px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.75fr);
    gap: 56px;
    align-items: end;
    margin-top: 28px;
  }

  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 48px;
  }
}

/* ---------- 起点 ---------- */
.page-about .about-origin-grid {
  display: grid;
  gap: 30px;
}

.page-about .about-origin-text p {
  margin-top: 16px;
  color: var(--ink);
}

.page-about .about-origin-text h2 {
  max-width: 24ch;
}

.page-about .about-origin-text .note {
  margin-top: 22px;
  padding-left: 16px;
  border-left: 3px solid var(--gold);
  background: var(--sand);
  padding: 14px 16px;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  color: var(--ink);
  font-size: 14.5px;
  line-height: 1.6;
}

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

.page-about .about-origin-media {
  border-radius: var(--r-lg);
  overflow: hidden;
}

@media (min-width: 900px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 56px;
    align-items: center;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-versions-head p {
  margin-top: 18px;
  max-width: 52ch;
  color: var(--rock);
}

.page-about .about-timeline {
  position: relative;
  margin-top: 40px;
  padding-left: 26px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--mist);
}

.page-about .about-entry {
  position: relative;
  padding-bottom: 34px;
}

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

.page-about .about-entry::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--paper);
}

.page-about .about-year {
  display: block;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink-green-3);
  line-height: 1.1;
}

.page-about .about-year span {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  letter-spacing: 0.08em;
  font-weight: 500;
  color: var(--rock);
}

.page-about .about-body {
  margin-top: 10px;
  max-width: 100%;
}

.page-about .about-entry-title {
  font-size: clamp(19px, 2.4vw, 23px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-body p {
  margin-top: 10px;
  font-size: 15.5px;
  line-height: 1.62;
  color: var(--rock);
}

.page-about .about-entry--ink .about-body {
  background: var(--ink-green);
  border-radius: var(--r-md);
  padding: 24px 22px;
}

.page-about .about-entry--ink .about-entry-title {
  color: var(--paper);
}

.page-about .about-entry--ink .about-body p {
  color: rgba(232, 220, 192, 0.82);
}

.page-about .about-entry-media {
  margin-top: 18px;
  border-radius: var(--r-sm);
  overflow: hidden;
}

@media (min-width: 900px) {
  .page-about .about-entry {
    display: grid;
    grid-template-columns: var(--about-year-w) minmax(0, 1fr);
    gap: 0 40px;
    padding-bottom: 40px;
  }

  .page-about .about-year {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-about .about-body {
    margin-top: 4px;
  }

  .page-about .about-entry:nth-child(odd) .about-body {
    max-width: 100%;
  }

  .page-about .about-entry:nth-child(even) .about-body {
    max-width: 54ch;
  }

  .page-about .about-entry--ink .about-body {
    padding: 30px 32px;
  }

  .page-about .about-entry--ink .about-body {
    max-width: 62ch;
  }
}

/* ---------- 三次结构调整 ---------- */
.page-about .about-shifts {
  background: var(--ink-green);
  color: var(--paper);
}

.page-about .about-shifts .section-label {
  color: var(--gold);
}

.page-about .about-shifts-head p {
  margin-top: 18px;
  max-width: 54ch;
  color: rgba(232, 220, 192, 0.76);
}

.page-about .about-shift-grid {
  display: grid;
  gap: 14px;
  margin-top: 32px;
}

.page-about .about-shift {
  background: var(--ink-green-2);
  border: 1px solid rgba(201, 162, 74, 0.26);
  border-radius: var(--r-md);
  padding: 20px;
  transition: border-color var(--ease), background var(--ease);
}

.page-about .about-shift[open] {
  background: var(--ink-green);
  border-color: rgba(201, 162, 74, 0.7);
}

.page-about .about-shift-summary {
  display: grid;
  gap: 8px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-shift-summary::marker {
  content: "";
}

.page-about .about-shift-year {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-shift-name {
  display: block;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-shift .pill {
  justify-self: start;
  margin-top: 4px;
}

.page-about .about-shift p {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(232, 220, 192, 0.18);
  font-size: 15px;
  line-height: 1.62;
  color: rgba(232, 220, 192, 0.8);
}

@media (min-width: 900px) {
  .page-about .about-shift-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
    margin-top: 40px;
  }

  .page-about .about-shift {
    padding: 24px;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-team-media {
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-team-text p {
  margin-top: 16px;
  color: var(--rock);
}

.page-about .about-team-list {
  margin-top: 24px;
  padding-top: 6px;
  border-top: 1px solid var(--mist);
  list-style: none;
}

.page-about .about-team-list li {
  display: grid;
  grid-template-columns: minmax(84px, auto) minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--mist);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
}

.page-about .about-team-list .mono {
  color: var(--ink-green-3);
  font-weight: 600;
  white-space: nowrap;
}

@media (min-width: 900px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 56px;
    align-items: center;
  }
}

/* ---------- 资质与生态 ---------- */
.page-about .about-eco {
  background: var(--sand);
}

.page-about .about-eco-grid {
  display: grid;
  gap: 26px;
}

.page-about .about-eco-intro p {
  margin-top: 16px;
  max-width: 44ch;
  color: var(--ink);
  opacity: 0.82;
}

.page-about .about-eco-list {
  list-style: none;
}

.page-about .about-eco-list li {
  padding: 18px 0;
  border-top: 1px solid rgba(20, 17, 14, 0.14);
}

.page-about .about-eco-list li:last-child {
  border-bottom: 1px solid rgba(20, 17, 14, 0.14);
}

.page-about .about-eco-list h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-eco-list p {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--rock);
}

@media (min-width: 900px) {
  .page-about .about-eco-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 64px;
    align-items: start;
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-next-grid {
  display: grid;
  gap: 26px;
  padding-top: 26px;
  border-top: 2px solid var(--ink-green);
}

.page-about .about-next-text p {
  margin-top: 16px;
  max-width: 50ch;
  color: var(--rock);
}

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

.page-about .about-next-link {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-green-3);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 2px;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  color: var(--red);
  border-color: var(--red);
}

@media (min-width: 900px) {
  .page-about .about-next-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 48px;
    align-items: end;
  }
}

/* ---------- 固定入口 ---------- */
.page-about .about-jump {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 30;
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border-radius: var(--pill);
  background: var(--gold);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  box-shadow: 0 10px 26px rgba(15, 42, 36, 0.26);
  transition: transform var(--ease), background var(--ease);
}

.page-about .about-jump:hover,
.page-about .about-jump:focus-visible {
  transform: translateY(-2px);
  background: var(--sand);
}

@media (min-width: 900px) {
  .page-about .about-jump {
    right: 24px;
    bottom: 24px;
    padding: 12px 20px;
    font-size: 13.5px;
  }
}

/* ---------- 入场动效 ---------- */
.page-about [data-reveal][data-revealed="true"] {
  animation: about-in 0.28s var(--ease) both;
}

@keyframes about-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal][data-revealed="true"] {
    animation: none;
  }

  .page-about .about-jump,
  .page-about .about-shift,
  .page-about .about-next-link {
    transition: none;
  }

  .page-about .about-jump:hover,
  .page-about .about-jump:focus-visible {
    transform: none;
  }
}