/* ============ 沿革与使命 · 页面专属样式 ============ */

.page-about {
  --about-panel: var(--ink-800);
  --about-panel-2: var(--ink-700);
  --about-rule: var(--line-600);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(28px, 5vw, 58px) 0 clamp(34px, 6vw, 72px);
  background:
    radial-gradient(110% 88% at 92% 2%, rgba(242, 193, 78, 0.16), transparent 56%),
    radial-gradient(100% 82% at 0% 100%, rgba(47, 230, 208, 0.15), transparent 60%),
    var(--ink-850);
  border-bottom: 1px solid var(--about-rule);
  border-radius: 0 0 var(--r-xl) var(--r-xl);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(232, 241, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 241, 255, 0.05) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 82%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-hero-copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-ui);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.4vw, 3.15rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--text);
  text-wrap: balance;
}

.page-about .about-hero-copy .lede {
  margin: 18px 0 0;
  max-width: 34em;
  color: var(--muted);
  line-height: 1.85;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 15px 16px 17px;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, rgba(23, 41, 63, 0.9), rgba(10, 21, 38, 0.72));
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.6vw, 1.3rem);
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: -0.01em;
}

.page-about .about-fact-label {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节头部微调 ---------- */
.page-about .section-head {
  display: grid;
  gap: 10px;
}

.page-about .section-sub {
  max-width: 46em;
  color: var(--muted);
  line-height: 1.8;
  margin: 0;
}

/* ---------- 01 时间轴 ---------- */
.page-about .about-timeline-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-timeline-visual {
  margin: 0;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .tl-list {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 30px;
  position: relative;
  display: grid;
  gap: 22px;
}

.page-about .tl-list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: var(--pill);
  background: linear-gradient(180deg, var(--cyan), rgba(47, 230, 208, 0.1));
}

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

.page-about .tl-dot {
  position: absolute;
  left: -30px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: var(--pill);
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  transition: box-shadow 0.18s var(--ease);
}

.page-about .tl-node:nth-child(even) .tl-dot {
  border-color: var(--gold);
}

.page-about .tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--gold);
  padding: 3px 10px;
  border-radius: var(--pill);
  border: 1px solid rgba(242, 193, 78, 0.32);
  background: rgba(242, 193, 78, 0.08);
  margin-bottom: 8px;
}

.page-about .tl-card {
  padding: 16px 18px 18px;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(16, 31, 53, 0.95), rgba(10, 21, 38, 0.82));
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
}

.page-about .tl-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-about .tl-node:hover .tl-card,
.page-about .tl-node:focus-within .tl-card {
  transform: translateY(-2px);
  border-color: rgba(47, 230, 208, 0.5);
  box-shadow: var(--shadow-card);
}

.page-about .tl-node:hover .tl-dot,
.page-about .tl-node:focus-within .tl-dot {
  box-shadow: 0 0 0 4px rgba(47, 230, 208, 0.18);
}

/* ---------- 02 收录标准 ---------- */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-figure .media-caption {
  display: block;
  padding: 12px 18px 14px;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--about-rule);
  background: rgba(10, 21, 38, 0.6);
}

.page-about .flow-steps {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .flow-step {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--about-rule);
  border-top: 2px solid rgba(242, 193, 78, 0.55);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, rgba(23, 41, 63, 0.85), rgba(10, 21, 38, 0.7));
}

.page-about .flow-step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .flow-step-title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .flow-step-text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 引文色带 ---------- */
.page-about .about-quote {
  padding: clamp(36px, 6vw, 74px) 0;
  background:
    linear-gradient(180deg, rgba(47, 230, 208, 0.1), rgba(47, 230, 208, 0.02)),
    var(--ink-850);
  border-top: 1px solid rgba(47, 230, 208, 0.24);
  border-bottom: 1px solid rgba(47, 230, 208, 0.24);
}

.page-about .quote-block {
  margin: 0;
  padding-left: clamp(18px, 3vw, 30px);
  border-left: 3px solid var(--cyan);
  max-width: 44em;
}

.page-about .quote-text {
  margin: 0;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: clamp(1.15rem, 3vw, 1.65rem);
  line-height: 1.6;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .quote-source {
  margin-top: 14px;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 03 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .team-roles {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .team-role {
  padding: 20px 20px 22px;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(16, 31, 53, 0.96), rgba(10, 21, 38, 0.8));
}

.page-about .team-role-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .team-role-name {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .team-role-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .team-role-list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .team-role-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: var(--pill);
  background: var(--cyan);
  opacity: 0.8;
}

.page-about .about-figure--team {
  margin-top: 0;
}

/* ---------- 04 版本节点 ---------- */
.page-about .milestone-list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .milestone {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 20px 20px 22px;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, rgba(16, 31, 53, 0.94), rgba(10, 21, 38, 0.78));
}

.page-about .milestone-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--gold);
  line-height: 1;
}

.page-about .milestone-title {
  margin: 0 0 8px;
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .milestone-text {
  margin: 0 0 14px;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .milestone-card .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* 标签补充：本站共享标签体系缺少的中性描边态 */
.page-about .tag--ghost {
  color: var(--muted);
  border: 1px solid var(--about-rule);
  background: rgba(23, 41, 63, 0.7);
}

/* ---------- 数据带 ---------- */
.page-about .about-band .data-band-inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.page-about .about-band .data-value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.15rem, 3vw, 1.6rem);
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-band .data-label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 05 合作与投稿 ---------- */
.page-about .coop-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .coop-card {
  display: flex;
  flex-direction: column;
  padding: 22px 20px 24px;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-lg);
  background: linear-gradient(158deg, rgba(23, 41, 63, 0.88), rgba(10, 21, 38, 0.74));
}

.page-about .coop-tag {
  align-self: flex-start;
  margin-bottom: 14px;
}

.page-about .coop-title {
  margin: 0 0 10px;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}

.page-about .coop-text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .coop-fit {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--about-rule);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .coop-contact {
  margin-top: clamp(22px, 4vw, 34px);
  padding: 20px 22px 22px;
  border: 1px solid rgba(255, 107, 74, 0.28);
  border-left: 3px solid var(--alert);
  border-radius: var(--r-md);
  background: rgba(255, 107, 74, 0.05);
}

.page-about .coop-contact-line {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--text);
}

.page-about .coop-contact-line .mono {
  color: var(--gold);
}

.page-about .coop-contact-note {
  margin: 10px 0 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 06 规划清单 ---------- */
.page-about .plan-list {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .plan-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 18px 22px;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, rgba(16, 31, 53, 0.92), rgba(10, 21, 38, 0.76));
}

.page-about .plan-index {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--r-md);
  border: 1px solid rgba(47, 230, 208, 0.4);
  background: rgba(47, 230, 208, 0.09);
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .plan-title {
  margin: 0 0 8px;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .plan-text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 结尾收束 ---------- */
.page-about .about-cta {
  padding: clamp(34px, 6vw, 72px) 0 clamp(46px, 7vw, 92px);
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--about-rule);
  border-radius: var(--r-xl);
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(47, 230, 208, 0.12), transparent 58%),
    var(--ink-850);
}

.page-about .about-cta-title {
  margin: 0;
  font-family: var(--font-ui);
  font-weight: 800;
  font-size: clamp(1.25rem, 3.4vw, 1.85rem);
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-about .about-cta-text {
  margin: 12px 0 0;
  max-width: 36em;
  font-size: 0.95rem;
  line-height: 1.82;
  color: var(--muted);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .flow-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(12px, 2vw, 20px);
  }

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

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

  .page-about .plan-item:first-child {
    grid-column: 1 / -1;
  }

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

  .page-about .milestone {
    grid-template-columns: 108px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

  .page-about .milestone-rail {
    padding-top: 2px;
  }

  .page-about .milestone-year {
    font-size: 1.55rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.9fr);
    align-items: center;
    gap: clamp(30px, 4vw, 60px);
  }

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

  .page-about .about-timeline-grid {
    grid-template-columns: minmax(0, 292px) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-timeline-visual {
    position: sticky;
    top: calc(var(--pad-x) + 8px);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: start;
  }

  .page-about .about-figure--team {
    position: sticky;
    top: calc(var(--pad-x) + 8px);
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-about .about-timeline-grid {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
  }
}

/* ---------- 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .tl-dot {
    transition: none;
  }

  .page-about .tl-node:hover .tl-card,
  .page-about .tl-node:focus-within .tl-card {
    transform: none;
  }
}