.page-about {
  --about-body: 1rem;
  --about-lead: 1.15rem;
  padding-bottom: clamp(32px, 6vw, 72px);
}

.page-about #about-fs-lg:checked ~ .about-scale {
  --about-body: 1.08rem;
  --about-lead: 1.24rem;
}

.page-about #about-fs-xl:checked ~ .about-scale {
  --about-body: 1.16rem;
  --about-lead: 1.34rem;
}

.page-about h1,
.page-about h2 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about h2 {
  font-size: clamp(1.65rem, 3vw, 2.5rem);
  line-height: 1.12;
  margin: 10px 0 12px;
}

.page-about h3 {
  color: var(--paper);
}

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

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

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

.page-about figcaption {
  margin-top: 12px;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--mist);
}

/* 顶部：面包屑与字号开关 */
.page-about .about-topline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-block: 18px 0;
}

.page-about .about-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-about .about-toolbar-label {
  margin-right: 4px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-fs {
  padding: 5px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 0.8rem;
  color: var(--mist);
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .about-fs:hover {
  color: var(--paper);
  border-color: var(--line-strong);
}

.page-about #about-fs-std:checked ~ .about-scale .about-fs[for="about-fs-std"],
.page-about #about-fs-lg:checked ~ .about-scale .about-fs[for="about-fs-lg"],
.page-about #about-fs-xl:checked ~ .about-scale .about-fs[for="about-fs-xl"] {
  color: var(--ink-deep);
  background: var(--volt);
  border-color: var(--volt);
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: clamp(26px, 5vw, 58px);
  padding-block: clamp(26px, 5vw, 54px) clamp(38px, 6vw, 88px);
}

.page-about .about-hero h1 {
  font-size: clamp(2.05rem, 5.2vw, 3.7rem);
  line-height: 1.06;
  max-width: 15em;
  margin: 12px 0 20px;
}

.page-about .about-lead {
  font-size: var(--about-lead);
  line-height: 1.72;
  color: var(--paper);
  max-width: 34em;
  margin: 0 0 14px;
}

.page-about .about-sub {
  font-size: var(--about-body);
  line-height: 1.78;
  color: var(--mist);
  max-width: 36em;
  margin: 0;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin: 28px 0 30px;
}

.page-about .about-fact {
  padding-left: 12px;
  border-left: 2px solid var(--teal);
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 2.6vw, 1.9rem);
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-fact-label {
  display: block;
  margin-top: 5px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-figure {
  margin: 0;
}

.page-about .about-hero-figure .media-frame {
  aspect-ratio: 16 / 10;
}

/* 章节通用 */
.page-about .section-head {
  max-width: 46em;
  margin-bottom: clamp(20px, 3.5vw, 34px);
}

.page-about .about-section-lead {
  font-size: var(--about-body);
  line-height: 1.78;
  color: var(--mist);
  max-width: 44em;
  margin: 0;
}

/* 时间轴 */
.page-about .tl-scale {
  padding: 10px 4px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .tl-svg {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: clamp(14px, 2.6vw, 26px);
}

.page-about .tl-svg circle {
  fill: var(--panel-soft);
  stroke: var(--teal);
  stroke-width: 2;
}

.page-about .tl-svg text {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 14px;
  text-anchor: middle;
}

.page-about .tl-svg .tl-tick-last circle {
  fill: var(--gold);
  stroke: var(--gold);
}

.page-about .tl-svg .tl-tick-last text {
  fill: var(--gold);
}

.page-about .tl-list {
  list-style: none;
  margin: clamp(18px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .tl-node details {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(27, 41, 66, 0.82), rgba(16, 26, 46, 0.92));
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .tl-node details:hover,
.page-about .tl-node details[open] {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .tl-node details[open] {
  border-left: 3px solid var(--gold);
}

.page-about .tl-sum {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 14px;
  align-items: center;
  padding: 16px 18px;
  list-style: none;
  cursor: pointer;
}

.page-about .tl-sum::-webkit-details-marker {
  display: none;
}

.page-about .tl-sum:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--r-lg);
}

.page-about .tl-season {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--gold);
}

.page-about .tl-title {
  grid-column: 1 / -1;
  font-family: var(--font-body);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .tl-cue {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--volt);
  transition: transform var(--dur) var(--ease);
}

.page-about .tl-node details[open] .tl-cue {
  transform: rotate(45deg);
}

.page-about .tl-body {
  padding: 0 18px 18px;
}

.page-about .tl-body p {
  margin: 0;
  font-size: var(--about-body);
  line-height: 1.78;
  color: var(--mist);
}

/* 编辑流程 */
.page-about .flow-layout {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--panel);
}

.page-about .flow-num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--clay);
}

.page-about .flow-title {
  margin: 0 0 6px;
  font-size: 1.06rem;
  font-weight: 700;
}

.page-about .flow-text {
  margin: 0;
  font-size: var(--about-body);
  line-height: 1.76;
  color: var(--mist);
}

.page-about .flow-figure {
  margin: 0;
}

.page-about .flow-figure .media-frame {
  aspect-ratio: 4 / 3;
  border-radius: var(--r-lg);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .team-card {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: radial-gradient(120% 120% at 100% 0%, rgba(84, 224, 198, 0.08), transparent 60%),
    var(--panel);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
}

.page-about .team-role {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--teal);
}

.page-about .team-count {
  margin: 4px 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 2.7rem);
  line-height: 1;
  color: var(--sand);
}

.page-about .team-desc {
  margin: 0;
  font-size: var(--about-body);
  line-height: 1.72;
  color: var(--mist);
}

.page-about .team-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--clay);
  max-width: 52em;
  font-size: var(--about-body);
  line-height: 1.8;
  color: var(--mist);
}

/* 合作生态 */
.page-about .coop-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .coop-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}

.page-about .coop-chip {
  padding: 6px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 0.82rem;
  color: var(--mist);
  cursor: pointer;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .coop-chip:hover {
  color: var(--paper);
  border-color: var(--line-strong);
}

.page-about #coop-all:checked ~ .coop-filter .coop-chip[for="coop-all"],
.page-about #coop-media:checked ~ .coop-filter .coop-chip[for="coop-media"],
.page-about #coop-data:checked ~ .coop-filter .coop-chip[for="coop-data"] {
  color: var(--ink-deep);
  background: var(--volt);
  border-color: var(--volt);
}

.page-about #coop-media:checked ~ .coop-list .coop-card[data-type="data"],
.page-about #coop-data:checked ~ .coop-list .coop-card[data-type="media"] {
  display: none;
}

.page-about .coop-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .coop-card {
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: rgba(27, 41, 66, 0.72);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .coop-card:hover {
  background: rgba(34, 49, 76, 0.9);
  border-color: var(--line-strong);
}

.page-about .coop-card[data-type="media"] {
  border-left-color: var(--teal);
}

.page-about .coop-card[data-type="data"] {
  border-left-color: var(--gold);
}

.page-about .coop-type {
  margin: 0 0 4px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .coop-name {
  margin: 0 0 5px;
  font-size: 0.98rem;
  font-weight: 700;
}

.page-about .coop-desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .coop-figure {
  margin: 0;
}

.page-about .coop-figure .media-frame {
  aspect-ratio: 3 / 2;
}

/* 读者规模 */
.page-about .about-reach {
  margin-block: clamp(30px, 5vw, 56px);
  background: linear-gradient(150deg, rgba(27, 41, 66, 0.94), rgba(10, 14, 22, 0.97));
  border-block: 1px solid var(--line);
}

.page-about .reach-inner {
  padding-block: clamp(34px, 5.5vw, 68px);
}

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

.page-about .reach-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 5vw, 3.3rem);
  line-height: 1;
  color: var(--sand);
}

.page-about .reach-label {
  margin: 8px 0 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .reach-text {
  margin: 8px 0 0;
  font-size: var(--about-body);
  line-height: 1.78;
  color: var(--mist);
  max-width: 34em;
}

/* 联系信息 */
.page-about .contact-table {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .contact-tr {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .contact-th {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .contact-td {
  margin: 0;
  font-size: var(--about-body);
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-about .contact-td.num {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.page-about .contact-note {
  margin: 18px 0 0;
  max-width: 48em;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--mist);
}

/* 收尾入口 */
.page-about .about-cta {
  padding-block: clamp(34px, 5vw, 64px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cta-inner h2 {
  margin-bottom: 10px;
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-cta-links a {
  display: inline-block;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 0.88rem;
  color: var(--paper);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .about-cta-links a:hover {
  color: var(--ink-deep);
  background: var(--volt);
  border-color: var(--volt);
}

.page-about .about-cta-links a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .tl-sum {
    grid-template-columns: 110px minmax(0, 1fr) auto;
    padding: 18px 22px;
  }

  .page-about .tl-title {
    grid-column: auto;
  }

  .page-about .tl-body {
    padding: 0 22px 20px;
  }

  .page-about .contact-tr {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .reach-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 36px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.3fr) minmax(260px, 0.7fr);
    align-items: end;
  }

  .page-about .about-hero-figure .media-frame {
    aspect-ratio: 4 / 5;
  }

  .page-about .flow-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }

  .page-about .coop-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node details,
  .page-about .team-card,
  .page-about .tl-cue {
    transition: none;
  }

  .page-about .tl-node details:hover,
  .page-about .team-card:hover {
    transform: none;
  }
}