.page-about {
  --about-note: 190px;
  --about-rule: 1px solid var(--line);
  background: var(--ink);
  color: var(--paper);
  display: block;
  overflow-x: hidden;
}

.page-about .about-hero {
  position: relative;
  padding: clamp(36px, 6vw, 84px) 0 clamp(40px, 6.5vw, 92px);
  border-bottom: var(--about-rule);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(58% 74% at 84% 4%, rgba(63, 232, 200, .11), transparent 64%),
    radial-gradient(52% 62% at 6% 96%, rgba(122, 92, 255, .12), transparent 62%);
  pointer-events: none;
}

.page-about .hero-title {
  margin: .3em 0 .45em;
  font-family: var(--font-display);
  font-size: clamp(40px, 8.4vw, 104px);
  font-weight: 200;
  line-height: .98;
  letter-spacing: .012em;
}

.page-about .hero-lead {
  max-width: 38em;
  margin: 0;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.9;
  color: rgba(243, 245, 249, .78);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
  margin: clamp(30px, 4.4vw, 56px) 0 0;
  padding-top: 26px;
  border-top: var(--about-rule);
}

.page-about .hero-facts dt {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .hero-facts dd {
  margin: 10px 0 0;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1;
  color: var(--paper);
}

@media (min-width: 760px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .chapter {
  position: relative;
  padding: clamp(56px, 8.5vw, 116px) 0;
  border-bottom: var(--about-rule);
}

.page-about .chapter-title {
  max-width: 20em;
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.2vw, 44px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.012em;
}

.page-about .chapter-lead {
  max-width: 40em;
  margin: 20px 0 0;
  font-size: 17px;
  line-height: 1.9;
  color: rgba(243, 245, 249, .78);
}

.page-about .chapter-layout {
  display: grid;
  gap: clamp(28px, 4.4vw, 48px);
  margin-top: clamp(28px, 4.4vw, 56px);
}

.page-about .chapter-body > p {
  max-width: 34em;
  margin: 0 0 1.2em;
  font-size: 17px;
  line-height: 1.9;
  color: rgba(243, 245, 249, .82);
}

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

@media (min-width: 960px) {
  .page-about .chapter-layout {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr) var(--about-note);
    align-items: start;
  }

  .page-about .chapter-layout--two {
    grid-template-columns: minmax(0, 1fr) var(--about-note);
  }

  .page-about .chapter-layout > .chapter-body {
    grid-column: 1;
  }

  .page-about .chapter-layout > .chapter-media {
    grid-column: 2;
  }

  .page-about .chapter-layout > .side-note {
    grid-column: 3;
  }
}

/* ---------- 图片与网格叠层 ---------- */

.page-about .chapter-media,
.page-about .wide-media,
.page-about .team-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .chapter-media img {
  aspect-ratio: 1 / 1;
}

.page-about .wide-media img {
  aspect-ratio: 3 / 2;
}

.page-about .team-media img {
  aspect-ratio: 12 / 7;
}

.page-about .chapter-media::after,
.page-about .wide-media::after,
.page-about .team-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(36, 49, 79, .6) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 49, 79, .6) 1px, transparent 1px);
  background-size: 54px 54px;
  opacity: .2;
  pointer-events: none;
  transition: opacity .4s var(--ease);
}

.page-about .chapter-media:hover::after,
.page-about .wide-media:hover::after,
.page-about .team-media:hover::after {
  opacity: .38;
}

.page-about .wide-media {
  margin-top: clamp(34px, 5vw, 60px);
}

.page-about .team-media {
  margin-top: clamp(34px, 5vw, 60px);
}

/* ---------- 边注 ---------- */

.page-about .side-note {
  position: relative;
  padding: 2px 0 2px 16px;
  border-left: 2px solid var(--amber);
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .side-note .note-label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .side-note .note-brief {
  margin: 0;
}

.page-about .side-note .note-more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height .44s var(--ease), opacity .32s var(--ease), margin .32s var(--ease);
}

.page-about .side-note:hover .note-more,
.page-about .side-note:focus .note-more,
.page-about .side-note:focus-within .note-more {
  max-height: 16em;
  margin-top: 8px;
  opacity: 1;
}

@media (hover: none) {
  .page-about .side-note .note-more {
    max-height: none;
    margin-top: 8px;
    opacity: 1;
  }
}

@media (min-width: 960px) {
  .page-about .side-note {
    position: sticky;
    top: 120px;
  }
}

/* ---------- 口径条款卡 ---------- */

.page-about .rules {
  display: grid;
  gap: 18px;
  margin-top: clamp(30px, 4.4vw, 52px);
}

@media (min-width: 860px) {
  .page-about .rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .rule-card {
  position: relative;
  background: linear-gradient(158deg, rgba(14, 24, 48, .97), rgba(9, 15, 33, .97));
  border: 1px solid var(--line);
  box-shadow: 6px 6px 0 rgba(36, 49, 79, .32);
}

.page-about .rule-card::before {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid rgba(36, 49, 79, .48);
  pointer-events: none;
}

.page-about .rule-summary {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .rule-summary:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: -4px;
}

.page-about .rule-num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--amber);
  border: 1px solid rgba(232, 163, 61, .42);
  padding: 3px 7px;
}

.page-about .rule-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .rule-caret {
  width: 9px;
  height: 9px;
  border-right: 1px solid var(--cyan);
  border-bottom: 1px solid var(--cyan);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform .34s var(--ease);
}

.page-about .rule-card[open] .rule-caret {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-about .rule-body {
  position: relative;
  z-index: 1;
  padding: 0 22px 22px;
}

.page-about .rule-body p {
  max-width: 34em;
  margin: 0;
}

/* ---------- 裁决流程 ---------- */

.page-about .flow-nodes {
  list-style: none;
  margin: clamp(34px, 5vw, 64px) 0 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.page-about .flow-node {
  position: relative;
  padding-left: 42px;
}

.page-about .flow-node::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: -30px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, rgba(63, 232, 200, .55), rgba(63, 232, 200, .06));
}

.page-about .flow-node:last-child::before {
  background: linear-gradient(180deg, rgba(63, 232, 200, .55), transparent);
}

.page-about .flow-mark {
  position: absolute;
  top: 4px;
  left: 0;
  width: 15px;
  height: 15px;
  border: 1px solid var(--cyan);
  background: var(--ink);
  transform: rotate(45deg);
}

.page-about .flow-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  background: var(--cyan);
}

.page-about .flow-step {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .flow-title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .flow-desc {
  max-width: 30em;
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(243, 245, 249, .72);
}

@media (min-width: 820px) {
  .page-about .flow-nodes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .flow-node {
    padding: 54px 26px 0 0;
  }

  .page-about .flow-node:last-child {
    padding-right: 0;
  }

  .page-about .flow-node::before {
    top: 20px;
    bottom: auto;
    left: 0;
    right: 0;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, rgba(63, 232, 200, .6), rgba(63, 232, 200, .1));
  }

  .page-about .flow-node:last-child::before {
    background: linear-gradient(90deg, rgba(63, 232, 200, .6), transparent);
  }

  .page-about .flow-mark {
    top: 13px;
    left: 0;
  }
}

.page-about .flow-foot {
  max-width: 44em;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--violet);
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队数据与节奏带 ---------- */

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 22px;
  margin-top: clamp(30px, 4.4vw, 52px);
  padding-top: 26px;
  border-top: var(--about-rule);
}

@media (min-width: 760px) {
  .page-about .team-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .team-stat {
  display: grid;
  gap: 10px;
}

.page-about .team-stat-num {
  font-size: clamp(30px, 4.4vw, 54px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-stat-label {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .shift-band {
  list-style: none;
  margin: clamp(34px, 5vw, 60px) 0 0;
  padding: 0 0 12px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(228px, 1fr);
  gap: 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--grid) transparent;
}

.page-about .shift-item {
  scroll-snap-align: start;
  padding-top: 16px;
  border-top: 2px solid var(--violet);
}

.page-about .shift-item:nth-child(1) {
  border-top-color: var(--cyan);
}

.page-about .shift-item:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .shift-item:nth-child(4) {
  border-top-color: var(--muted);
}

.page-about .shift-time {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .shift-what {
  display: block;
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 回纹分隔 ---------- */

.page-about .meander {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  height: 24px;
  overflow: hidden;
}

.page-about .meander svg {
  display: block;
  width: 100%;
  height: 24px;
}

/* ---------- 承诺聚焦卡 ---------- */

.page-about .pledge-card {
  position: relative;
  max-width: 760px;
  margin: clamp(30px, 4.6vw, 54px) auto 0;
  padding: clamp(28px, 4.4vw, 56px);
  background: var(--paper);
  color: var(--black);
  box-shadow: 12px 12px 0 rgba(232, 163, 61, .18);
}

.page-about .pledge-card::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(232, 163, 61, .58);
  pointer-events: none;
}

.page-about .pledge-title {
  position: relative;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 36px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--black);
}

.page-about .pledge-lead {
  position: relative;
  max-width: 34em;
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(10, 12, 18, .72);
}

.page-about .pledge-list {
  position: relative;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .pledge-list li {
  display: grid;
  gap: 7px;
  padding: 18px 0;
}

.page-about .pledge-list li + li {
  border-top: 1px solid rgba(10, 12, 18, .16);
}

.page-about .pledge-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--amber-ink);
}

.page-about .pledge-val {
  font-family: var(--font-serif);
  font-size: 16.5px;
  line-height: 1.9;
  color: #23262E;
}

/* ---------- 页尾导流 ---------- */

.page-about .about-outro {
  padding: clamp(50px, 7.5vw, 96px) 0 clamp(64px, 9vw, 124px);
}

.page-about .outro-text {
  max-width: 46em;
  margin: 0;
  font-size: 16.5px;
  line-height: 1.9;
  color: rgba(243, 245, 249, .78);
}

.page-about .outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}