.page-about {
  --story-radius: 32px;
  --story-grid-line: rgba(232, 230, 245, .055);
  --story-panel: rgba(18, 16, 31, .86);
}

/* ---------- 首屏 ---------- */
.page-about .story-hero {
  position: relative;
  isolation: isolate;
  padding: 20px 0 54px;
}

.page-about .story-hero::before {
  content: "";
  position: absolute;
  inset: -140px -8% auto -8%;
  height: 560px;
  z-index: -1;
  background:
    radial-gradient(58% 68% at 78% 22%, rgba(122, 59, 255, .40), transparent 70%),
    radial-gradient(44% 58% at 10% 78%, rgba(0, 229, 255, .16), transparent 70%);
  filter: blur(4px);
  pointer-events: none;
}

.page-about .story-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(var(--story-grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.page-about .hero-grid {
  display: grid;
  gap: 28px;
  margin-top: 22px;
}

.page-about .hero-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .hero-copy h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7.4vw, 3.6rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--text);
  text-shadow: 0 0 44px rgba(122, 59, 255, .45);
}

.page-about .hero-lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 2.2vw, 1.125rem);
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .fact-item {
  padding: 18px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(122, 59, 255, .16), rgba(18, 16, 31, .92));
}

.page-about .fact-item .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 4vw, 1.7rem);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--gold);
}

.page-about .fact-item .stat-value--cyan { color: var(--cyan); }
.page-about .fact-item .stat-value--pink { color: var(--pink); }

.page-about .fact-item .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 侧边轨道 ---------- */
.page-about .side-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  margin-bottom: 14px;
  padding: 10px 0;
  background: rgba(7, 6, 15, .94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.page-about .side-rail .rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 2px 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-about .side-rail .rail-link {
  display: block;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .side-rail .rail-link:hover,
.page-about .side-rail .rail-link:focus-visible {
  color: var(--text);
  border-color: rgba(185, 139, 255, .6);
}

.page-about .story-rail-note { display: none; }

.page-about .story-body {
  display: flex;
  flex-direction: column;
  gap: 34px;
  min-width: 0;
}

/* ---------- 章节面板 ---------- */
.page-about .story-section {
  position: relative;
  padding: 26px 20px 28px;
  border-radius: var(--story-radius);
  border: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(26, 23, 48, .74), rgba(18, 16, 31, .94) 64%);
  overflow: hidden;
}

.page-about .story-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(232, 230, 245, .05) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: .6;
  pointer-events: none;
}

.page-about .story-section > * { position: relative; }

.page-about .story-section .section-head { margin-bottom: 22px; }

.page-about .story-section .section-title {
  font-family: var(--font-display);
  letter-spacing: -.02em;
  line-height: 1.22;
}

.page-about .story-section .section-lead {
  max-width: 64ch;
  line-height: 1.8;
}

.page-about .story-section .section-note {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px dashed rgba(42, 39, 64, .9);
  font-size: .92rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .story-section .section-note a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

/* ---------- 01 起点 ---------- */
.page-about .story-cols {
  display: grid;
  gap: 18px;
}

.page-about .story-prose {
  padding: 22px 20px;
  border-radius: var(--r-lg);
  background: rgba(7, 6, 15, .55);
  border-left: 3px solid var(--neon);
}

.page-about .story-prose p {
  margin: 0 0 14px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .story-prose p:last-child { margin-bottom: 0; }

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

.page-about .clue-list li {
  padding: 16px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(122, 59, 255, .1);
}

.page-about .clue-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .clue-list p {
  margin: 8px 0 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 02 会员等级 ---------- */
.page-about .tier-grid {
  display: grid;
  gap: 24px;
}

.page-about .tier-stack {
  display: grid;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .tier-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .98rem;
  color: var(--text);
}

.page-about .tier-block--1 {
  background: rgba(122, 59, 255, .18);
  border-color: rgba(122, 59, 255, .38);
}

.page-about .tier-block--2 {
  background: rgba(185, 139, 255, .16);
  border-color: rgba(185, 139, 255, .42);
}

.page-about .tier-block--3 {
  background: rgba(0, 229, 255, .13);
  border-color: rgba(0, 229, 255, .38);
}

.page-about .tier-block--4 {
  background: linear-gradient(90deg, rgba(255, 209, 102, .26), rgba(255, 79, 163, .18));
  border-color: rgba(255, 209, 102, .52);
}

.page-about .tier-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .tier-tabwrap {
  padding: 18px 16px 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: rgba(7, 6, 15, .5);
}

.page-about .tier-tabwrap .tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

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

.page-about .tier-perks li {
  position: relative;
  padding-left: 22px;
  font-size: .96rem;
  line-height: 1.75;
  color: var(--text);
}

.page-about .tier-perks li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: .66em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--pink);
  box-shadow: 0 0 12px rgba(255, 79, 163, .8);
}

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

/* ---------- 通用图框补充 ---------- */
.page-about .media-frame {
  margin: 0 0 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  overflow: hidden;
}

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

.page-about .tier-figure { margin-bottom: 0; }

/* ---------- 03 团队 ---------- */
.page-about .ops-grid {
  display: grid;
  gap: 16px;
}

.page-about .ops-card {
  padding: 22px 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(122, 59, 255, .14), rgba(18, 16, 31, .92));
}

.page-about .ops-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.1rem;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold);
}

.page-about .ops-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--text);
}

.page-about .ops-card p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 04 开发者分级 ---------- */
.page-about .dev-grid {
  display: grid;
  gap: 14px;
}

.page-about .dev-card {
  padding: 20px 18px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  border-top-width: 3px;
  background: rgba(7, 6, 15, .55);
}

.page-about .dev-card--s { border-top-color: var(--gold); }
.page-about .dev-card--a { border-top-color: var(--pink); }
.page-about .dev-card--b { border-top-color: var(--cyan); }
.page-about .dev-card--c { border-top-color: var(--neon); }

.page-about .dev-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--text);
}

.page-about .dev-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 05 时间轴 ---------- */
.page-about .timeline-scroll {
  overflow-x: auto;
  padding: 4px 0 14px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(122, 59, 255, .65) transparent;
}

.page-about .timeline-track {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  min-width: max-content;
  padding: 34px 6px 6px;
}

.page-about .timeline-track::before {
  content: "";
  position: absolute;
  left: 6px;
  right: 6px;
  top: 14px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(122, 59, 255, .18), rgba(122, 59, 255, .9) 22%, rgba(0, 229, 255, .75) 68%, rgba(255, 79, 163, .55));
}

.page-about .tl-item {
  position: relative;
  flex: 0 0 auto;
  width: 258px;
  padding: 16px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: rgba(18, 16, 31, .9);
}

.page-about .tl-dot {
  position: absolute;
  top: -26px;
  left: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(122, 59, 255, .18), 0 0 16px rgba(122, 59, 255, .9);
}

.page-about .tl-stage {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .tl-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(122, 59, 255, .14);
  color: var(--text);
  font-family: var(--font-display);
  font-size: .97rem;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .tl-trigger:hover,
.page-about .tl-trigger:focus-visible {
  background: rgba(122, 59, 255, .26);
  border-color: rgba(185, 139, 255, .55);
}

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

.page-about .tl-item .acc-panel { padding-top: 12px; }

.page-about .tl-item .acc-panel p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 06 一直没改的做法 ---------- */
.page-about .promise-grid {
  display: grid;
  gap: 16px;
}

.page-about .promise-card {
  padding: 24px 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: rgba(7, 6, 15, .58);
}

.page-about .promise-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--pink);
}

.page-about .promise-card h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  color: var(--text);
}

.page-about .promise-card p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .promise-card a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

.page-about .story-cta {
  display: grid;
  gap: 18px;
  margin-top: 24px;
  padding: 26px 22px;
  border-radius: var(--r-lg);
  border: 1px solid rgba(185, 139, 255, .42);
  background: linear-gradient(135deg, rgba(122, 59, 255, .3), rgba(255, 79, 163, .18));
}

.page-about .story-cta h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.3;
  color: var(--text);
}

.page-about .story-cta p {
  margin: 0;
  line-height: 1.78;
  color: rgba(232, 230, 245, .84);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .tier-block { width: 100%; }
  .page-about .tier-block--1 { width: 60%; }
  .page-about .tier-block--2 { width: 73%; }
  .page-about .tier-block--3 { width: 86%; }
  .page-about .tier-block--4 { width: 100%; }

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

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

@media (min-width: 900px) {
  .page-about .story-hero { padding: 34px 0 70px; }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 44px;
    align-items: end;
    margin-top: 30px;
  }

  .page-about .story-cols {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 26px;
  }

  .page-about .tier-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .story-section { padding: 34px 30px 36px; }

  .page-about .story-body { gap: 44px; }

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

  .page-about .story-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 30px 28px;
  }
}

@media (min-width: 1080px) {
  .page-about .side-rail {
    top: calc(var(--header-h) + 26px);
    margin-bottom: 0;
    padding: 0;
    background: transparent;
    backdrop-filter: none;
    border-bottom: 0;
  }

  .page-about .side-rail .rail-list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .side-rail .rail-list li + li { margin-top: 8px; }

  .page-about .side-rail .rail-link {
    border-radius: var(--r-sm);
    padding: 10px 14px;
    font-size: 11.5px;
  }

  .page-about .story-rail-note {
    display: block;
    margin-top: 26px;
    height: 132px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .24em;
    color: rgba(232, 230, 245, .32);
    writing-mode: vertical-rl;
    transform: rotate(180deg);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tier-block,
  .page-about .side-rail .rail-link,
  .page-about .tl-trigger {
    transition: none;
  }
}