.page-about {
  --about-rail: 96px;
  --about-flow-w: clamp(184px, 46vw, 232px);
  padding-block: clamp(26px, 5vw, 54px) clamp(56px, 9vw, 108px);
}

/* ---------- 页头 ---------- */
.page-about .about-head {
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-head .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-title,
.page-about h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--warm);
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  max-width: 16em;
}

.page-about .about-lead {
  font-size: 17px;
  line-height: 1.8;
  color: var(--cream);
  max-width: 34em;
  margin: 0;
}

/* ---------- 章节缩写导航 ---------- */
.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(22px, 3.4vw, 36px);
}

.page-about .about-toc .toc-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  text-decoration: none;
  padding: 7px 13px;
  border: 1px solid var(--stone);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .about-toc .toc-link:hover,
.page-about .about-toc .toc-link:focus-visible,
.page-about .about-toc .toc-link.is-active {
  color: var(--night);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 首屏通栏图 ---------- */
.page-about .about-hero {
  margin: 0 auto clamp(34px, 6vw, 70px);
}

.page-about .media-frame {
  overflow: hidden;
}

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

.page-about .about-figure {
  margin: clamp(20px, 3vw, 30px) 0 clamp(22px, 3vw, 32px);
}

/* ---------- 竖向时间轴 ---------- */
.page-about .tl {
  position: relative;
  --line-x: 5px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: var(--line-x);
  top: 8px;
  bottom: clamp(40px, 6vw, 78px);
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--stone) 0%,
    var(--stone) 82%,
    rgba(44, 71, 64, 0) 100%
  );
  pointer-events: none;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding-bottom: clamp(42px, 6vw, 80px);
}

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

.page-about .tl-rail {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.page-about .tl-node {
  flex: none;
  width: 12px;
  height: 12px;
  background: var(--stone);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px var(--night);
  transition: background-color 300ms var(--ease), box-shadow 300ms var(--ease);
}

.page-about .tl-item.is-visible .tl-node {
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--night), 0 0 0 6px rgba(79, 227, 193, 0.22);
}

.page-about .tl-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .tl-body {
  min-width: 0;
}

.page-about .tl-body > .section-title {
  margin: 0 0 clamp(14px, 2vw, 20px);
}

.page-about .tl-body p {
  font-size: 17px;
  line-height: 1.8;
  color: var(--cream);
  max-width: 34em;
  margin: 0 0 16px;
}

.page-about .tl-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 可折叠旁注 ---------- */
.page-about .about-aside {
  margin-top: 20px;
  padding-left: 14px;
  border-left: 2px solid var(--clay);
}

.page-about .about-aside summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

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

.page-about .about-aside summary::before {
  content: "＋ ";
}

.page-about .about-aside[open] summary::before {
  content: "－ ";
}

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

.page-about .about-aside p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  margin: 10px 0 0;
  max-width: 34em;
}

/* ---------- 版本迭代卡片 ---------- */
.page-about .ver-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .ver-card {
  position: relative;
  padding: 20px 22px 22px;
  background: linear-gradient(165deg, var(--moss) 0%, var(--night) 90%);
  border: 1px solid var(--stone);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ver-card:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .ver-step {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .ver-card h3 {
  font-size: 19px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--warm);
  margin: 0 0 10px;
}

.page-about .ver-card p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  margin: 0;
  max-width: 34em;
}

/* ---------- 采编流程横带 ---------- */
.page-about .flow-band {
  margin-top: clamp(22px, 3.2vw, 34px);
  padding: 4px 0 4px 18px;
  background: linear-gradient(
    100deg,
    var(--moss) 0%,
    rgba(19, 48, 42, 0.4) 62%,
    rgba(11, 31, 26, 0) 100%
  );
  border-left: 2px solid var(--cyan);
}

.page-about .flow {
  display: flex;
  gap: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 10px;
  scrollbar-width: thin;
}

.page-about .flow-step {
  position: relative;
  flex: 0 0 var(--about-flow-w);
  padding: 28px 22px 4px 0;
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  top: 13px;
  left: 4px;
  right: 0;
  height: 1px;
  background: var(--stone);
}

.page-about .flow-step::after {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .flow-step:last-child::before {
  background: linear-gradient(90deg, var(--stone) 0%, rgba(44, 71, 64, 0) 100%);
}

.page-about .flow-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .flow-step h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--warm);
  margin: 0 0 8px;
}

.page-about .flow-step p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  margin: 0;
  max-width: 22em;
}

/* ---------- 团队卡片 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px;
  background: var(--moss);
  border: 1px solid var(--stone);
  clip-path: polygon(18px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%, 0 18px);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  border-color: var(--cyan);
  background: #16352E;
  outline: none;
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  bottom: 24px;
  width: 2px;
  background: var(--stone);
  transition: background-color var(--dur) var(--ease);
}

.page-about .team-card:hover::before,
.page-about .team-card:focus-visible::before {
  background: var(--cyan);
}

.page-about .team-role {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
  margin-bottom: 10px;
}

.page-about .team-count {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 38px);
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--cyan);
  margin-bottom: 16px;
}

.page-about .team-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--warm);
  margin: 0 0 10px;
}

.page-about .team-card > p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--cream);
  margin: 0;
}

.page-about .team-more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin: 0;
  padding-top: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid transparent;
  transition: max-height 240ms var(--ease), opacity 240ms var(--ease),
    margin-top 240ms var(--ease), padding-top 240ms var(--ease),
    border-color 240ms var(--ease);
}

.page-about .team-card:hover .team-more,
.page-about .team-card:focus-visible .team-more,
.page-about .team-card:focus-within .team-more {
  max-height: 220px;
  opacity: 1;
  margin-top: 14px;
  padding-top: 12px;
  border-top-color: var(--stone);
}

/* ---------- 合作生态清单 ---------- */
.page-about .eco-list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: 1px solid var(--stone);
}

.page-about .eco-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--stone);
  transition: border-color var(--dur) var(--ease);
}

.page-about .eco-item:hover {
  border-bottom-color: var(--cyan);
}

.page-about .eco-name {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 17px;
  font-weight: 700;
  color: var(--warm);
}

.page-about .eco-name::before {
  content: "";
  flex: none;
  width: 18px;
  height: 2px;
  background: var(--clay);
  transform: translateY(-5px);
}

.page-about .eco-item p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  margin: 0;
}

.page-about .eco-tail {
  margin-top: clamp(18px, 2.6vw, 26px);
}

/* ---------- 收束区 ---------- */
.page-about .about-cta {
  margin-top: clamp(28px, 4.4vw, 50px);
  padding: clamp(22px, 3vw, 32px);
  background: linear-gradient(115deg, var(--moss) 0%, var(--night) 100%);
  border: 1px solid var(--stone);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-cta p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--cream);
  max-width: 34em;
  margin: 0 0 18px;
}

.page-about .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 720px) {
  .page-about .ver-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 20px;
  }

  .page-about .ver-card:nth-child(even) {
    margin-top: 28px;
  }
}

@media (min-width: 760px) {
  .page-about .eco-item {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }
}

@media (min-width: 780px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .tl {
    --line-x: calc(var(--about-rail) - 24px);
  }

  .page-about .tl-item {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 52px);
    align-items: start;
  }

  .page-about .tl-rail {
    flex-direction: column;
    align-items: flex-end;
    gap: 12px;
    padding-right: 18px;
    padding-top: 6px;
  }

  .page-about .tl-label {
    letter-spacing: 0.18em;
  }

  .page-about .about-lead {
    font-size: 18px;
  }
}
</style>