.page-about {
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: 36px 56px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 70%;
  background:
    radial-gradient(58% 100% at 18% 0%, rgba(47, 227, 214, 0.16), transparent 70%),
    radial-gradient(48% 90% at 88% 8%, rgba(255, 61, 154, 0.12), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .about-hero-copy .exhibit-tag {
  margin: 0;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--f-head);
  font-size: clamp(32px, 7.4vw, var(--t-2xl));
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 48ch;
  color: var(--mist);
}

.page-about .about-hero-meta {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: var(--t-sm);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-hero-visual {
  position: relative;
  min-height: 220px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background:
    radial-gradient(circle at 1px 1px, rgba(154, 169, 194, 0.26) 1px, transparent 0) 0 0 / 26px 26px,
    linear-gradient(155deg, var(--console) 0%, var(--ink) 72%);
  overflow: hidden;
}

.page-about .hero-glow {
  position: absolute;
  inset: auto -20% -42% -20%;
  height: 72%;
  background: radial-gradient(circle at 50% 50%, rgba(47, 227, 214, 0.4), transparent 66%);
  animation: about-breathe 6s ease-in-out infinite;
}

@keyframes about-breathe {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 0.7; }
}

.page-about .hero-trace {
  position: absolute;
  left: -8%;
  width: 116%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0.85;
}

.page-about .hero-trace--a { top: 32%; }
.page-about .hero-trace--b {
  top: 50%;
  background: linear-gradient(90deg, transparent, var(--magenta), transparent);
  opacity: 0.6;
}
.page-about .hero-trace--c {
  top: 68%;
  background: linear-gradient(90deg, transparent, var(--amber), transparent);
  opacity: 0.5;
}

/* ---------- 章节导航 ---------- */
.page-about .about-chapters {
  border-block: 1px solid var(--line);
  background: linear-gradient(180deg, var(--console), var(--ink));
}

.page-about .about-chapter-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 12px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-chapter-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-chapter-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--mist);
  font-size: var(--t-sm);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-chapter-list a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-chapter-list a:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-chapter-list .mono {
  color: var(--amber);
  font-size: var(--t-xs);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  scroll-margin-top: 96px;
}

.page-about .about-band-figure {
  margin: 26px 0 0;
}

.page-about .about-chapter-body {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-chapter-main {
  display: grid;
  gap: 20px;
}

.page-about .side-note {
  font-family: var(--f-mono);
  font-size: var(--t-xs);
  letter-spacing: 0.32em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-chapter-main > .prose {
  margin: 0;
}

.page-about .media-frame {
  margin: 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r);
}

/* ---------- 01 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 26px;
  margin: 10px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--line);
}

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

.page-about .tl-dot {
  position: absolute;
  left: -31px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(47, 227, 214, 0.8);
}

.page-about .tl-dot--magenta {
  background: var(--magenta);
  box-shadow: 0 0 12px rgba(255, 61, 154, 0.8);
}

.page-about .tl-dot--amber {
  background: var(--amber);
  box-shadow: 0 0 12px rgba(255, 194, 75, 0.8);
}

.page-about .tl-year {
  display: block;
  font-size: var(--t-xs);
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .tl-title {
  margin: 6px 0 0;
  font-family: var(--f-head);
  font-size: var(--t-md);
  font-weight: 700;
  color: var(--white);
}

.page-about .tl-text {
  margin: 6px 0 0;
  font-size: var(--t-sm);
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 02 内容板块 ---------- */
.page-about .block-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .block-item {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--r);
  background: var(--graphite);
}

.page-about .block-item:nth-child(2n) {
  border-left-color: var(--magenta);
}

.page-about .block-item:nth-child(3n) {
  border-left-color: var(--amber);
}

.page-about .block-title {
  margin: 0;
  font-family: var(--f-head);
  font-size: var(--t-md);
  font-weight: 700;
  color: var(--white);
}

.page-about .block-text {
  margin: 8px 0 0;
  font-size: var(--t-sm);
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 26px;
}

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

.page-about .team-row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) auto;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 8px 14px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--graphite);
  outline: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .team-row:hover,
.page-about .team-row:focus {
  border-color: var(--cyan);
  background: var(--console);
}

.page-about .team-row:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.page-about .team-label {
  font-size: var(--t-sm);
  color: var(--white);
  white-space: nowrap;
}

.page-about .team-track {
  display: block;
  height: 10px;
  border-radius: 999px;
  background: rgba(31, 42, 68, 0.9);
  overflow: hidden;
}

.page-about .team-bar {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
}

.page-about .team-row:nth-child(1) .team-bar { width: 39%; }
.page-about .team-row:nth-child(2) .team-bar { width: 26%; }
.page-about .team-row:nth-child(3) .team-bar { width: 22%; }
.page-about .team-row:nth-child(4) .team-bar { width: 13%; }

.page-about .team-count {
  font-size: var(--t-sm);
  color: var(--amber);
  text-align: right;
  white-space: nowrap;
}

.page-about .team-note {
  grid-column: 1 / -1;
  grid-row: 2;
  max-height: 140px;
  overflow: hidden;
  font-size: var(--t-sm);
  line-height: 1.8;
  color: var(--mist);
  opacity: 1;
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

/* ---------- 04 更新节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  gap: 28px;
}

.page-about .about-rhythm-main {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .tabpanel {
  display: grid;
  gap: 10px;
  justify-items: start;
}

.page-about .rhythm-title {
  margin: 0;
  font-family: var(--f-head);
  font-size: var(--t-lg);
  font-weight: 700;
  color: var(--white);
}

.page-about .tabpanel .prose {
  margin: 0;
}

/* ---------- 05 运营与备案 ---------- */
.page-about .about-facts {
  display: grid;
  gap: 12px;
  margin: 6px 0 0;
  padding: 0;
}

.page-about .fact {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--console);
}

.page-about .fact-key {
  font-size: var(--t-xs);
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .fact-val {
  margin: 0;
  font-size: var(--t-sm);
  line-height: 1.8;
  color: var(--white);
}

/* ---------- 收束展签 ---------- */
.page-about .about-closing {
  padding-block: 40px 72px;
}

.page-about .closing-tag {
  display: grid;
  gap: 16px;
  justify-items: start;
  padding: 28px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background:
    linear-gradient(120deg, rgba(12, 18, 32, 0.96), rgba(5, 7, 15, 0.96)),
    linear-gradient(90deg, var(--cyan), var(--magenta));
}

.page-about .closing-tag .exhibit-tag {
  margin: 0;
}

.page-about .closing-line {
  margin: 0;
  max-width: 52ch;
  font-family: var(--f-head);
  font-size: var(--t-lg);
  font-weight: 700;
  line-height: 1.55;
  color: var(--white);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
    padding: 44px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .tl-dot {
    left: 0;
    top: -48px;
    width: 11px;
    height: 11px;
  }

  .page-about .block-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 20px;
    padding-bottom: 30px;
  }

  .page-about .block-item:nth-child(2n) {
    transform: translateY(30px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-block: 56px 80px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 56px;
  }

  .page-about .about-hero-visual {
    min-height: 380px;
  }

  .page-about .about-chapter-body {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 30px;
  }

  .page-about .about-chapter-body > .side-note {
    writing-mode: vertical-rl;
    justify-self: start;
    padding-top: 4px;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.8fr);
    align-items: start;
  }

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

  .page-about .closing-tag {
    padding: 36px 34px;
  }
}

@media (min-width: 900px) and (max-width: 1099px) {
  .page-about .about-chapter-body > .side-note {
    writing-mode: horizontal-tb;
    letter-spacing: 0.18em;
  }
}

@media (min-width: 900px) {
  .page-about .team-note {
    max-height: 0;
    opacity: 0;
  }

  .page-about .team-row:hover .team-note,
  .page-about .team-row:focus .team-note {
    max-height: 140px;
    opacity: 1;
  }
}

@media (min-width: 1100px) {
  .page-about .about-chapter-body > .side-note {
    writing-mode: vertical-rl;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .hero-glow {
    animation: none;
    opacity: 0.6;
  }

  .page-about .team-note,
  .page-about .team-row,
  .page-about .about-chapter-list a {
    transition: none;
  }
}