.page-about {
  --ab-hair: rgba(255, 255, 255, .10);
  --ab-hair-strong: rgba(255, 255, 255, .20);
  --ab-shadow: 0 22px 50px -34px rgba(0, 0, 0, .9);
  background: var(--ink);
  color: var(--text);
  overflow-x: clip;
}

.page-about .shell {
  width: 100%;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(18px, 3.4vw, 34px) 0 clamp(46px, 6.5vw, 92px);
  background:
    radial-gradient(120% 84% at 94% 4%, rgba(58, 107, 255, .34), transparent 62%),
    radial-gradient(86% 66% at 6% 98%, rgba(53, 214, 232, .16), transparent 64%),
    var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -2%;
  left: -15%;
  width: 130%;
  height: 104%;
  background: linear-gradient(150deg, var(--paper) 0%, var(--paper-shade) 100%);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--paper-muted);
}

.page-about .breadcrumb a {
  color: var(--paper-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(27, 32, 51, .28);
}

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--paper-ink);
}

.page-about .breadcrumb-sep {
  color: rgba(27, 32, 51, .40);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(26px, 4.4vw, 54px);
  align-items: center;
  padding-top: clamp(26px, 4.6vw, 56px);
}

.page-about .hero-copy {
  color: var(--paper-ink);
  max-width: 660px;
}

.page-about .hero-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #6C5468;
}

.page-about .hero-copy h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 5.1vw, 54px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -.012em;
  color: var(--paper-ink);
}

.page-about .hero-lead {
  margin: 0 0 26px;
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.78;
  max-width: 620px;
  color: #2B3350;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 22px;
}

.page-about .hero-link {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--paper-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(27, 32, 51, .4);
  padding-bottom: 2px;
}

.page-about .hero-link:hover {
  border-bottom-color: var(--orange);
  color: #A03A0C;
}

.page-about .hero-status {
  border: 1px solid var(--ab-hair-strong);
  border-radius: var(--radius);
  background: linear-gradient(168deg, var(--panel) 0%, var(--panel-soft) 100%);
  box-shadow: var(--ab-shadow);
  padding: clamp(18px, 2.4vw, 24px);
}

.page-about .hero-status-cap {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .hero-facts {
  margin: 0;
  display: grid;
}

.page-about .hero-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .hero-fact:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .hero-fact:last-child {
  padding-bottom: 0;
}

.page-about .hero-fact dt {
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .hero-fact dd {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: -.01em;
}

/* ============ 右侧章节指示 ============ */
.page-about .rail {
  display: none;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-end;
}

.page-about .rail-link {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.page-about .rail-dot {
  order: 2;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  font-size: 10px;
  border: 1px solid var(--ab-hair-strong);
  border-radius: 50%;
  color: var(--muted);
  background: rgba(12, 18, 38, .82);
  transition: background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .rail-text {
  order: 1;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
  opacity: 0;
  transform: translateX(6px);
  transition: opacity .22s var(--ease), transform .22s var(--ease);
  white-space: nowrap;
}

.page-about .rail-link:hover .rail-text,
.page-about .rail-link:focus-visible .rail-text,
.page-about .rail-link.is-current .rail-text {
  opacity: 1;
  transform: none;
}

.page-about .rail-link.is-current .rail-dot {
  background: var(--orange);
  border-color: transparent;
  color: var(--orange-ink);
  font-weight: 700;
}

@media (min-width: 1180px) {
  .page-about .rail {
    display: block;
    position: fixed;
    z-index: 40;
    right: max(14px, calc((100vw - var(--shell)) / 2 - 56px));
    top: 50%;
    transform: translateY(-50%);
  }
}

/* ============ 章节骨架 ============ */
.page-about .about-sec {
  position: relative;
  padding: clamp(48px, 6.4vw, 96px) 0;
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--ab-hair);
}

.page-about .sec-head {
  max-width: 780px;
  margin-bottom: clamp(26px, 3.6vw, 46px);
}

.page-about .sec-num {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .sec-head h2 {
  margin: 0 0 14px;
  font-size: clamp(23px, 3.3vw, 37px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .sec-lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 680px;
}

/* ============ 通用非对称分栏 ============ */
.page-about .split-7-5 {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
  align-items: start;
}

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

.page-about .idx-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 20px;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--panel-soft), rgba(12, 18, 38, .5));
  box-shadow: var(--ab-shadow);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .idx-row:hover {
  border-color: var(--ab-hair-strong);
  transform: translateY(-2px);
}

.page-about .idx-id {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .idx-title {
  margin: 0 0 7px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .idx-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .audience-card {
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 22px;
}

.page-about .audience-cap {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

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

.page-about .audience-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .audience-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--cyan), var(--blue));
}

@media (min-width: 900px) {
  .page-about .split-7-5 {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .85fr);
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .split-7-5--rev {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
}

/* ============ 图片容器 ============ */
.page-about .tl-figure {
  margin: 0 0 clamp(24px, 3vw, 38px);
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-soft);
}

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

/* ============ 版本时间线 ============ */
.page-about .tl {
  position: relative;
}

.page-about .tl-line {
  display: none;
}

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

.page-about .tl-node {
  position: relative;
  padding: 36px 0 0;
}

.page-about .tl-dot {
  position: absolute;
  top: 8px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--muted);
  transition: border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .tl-node--current .tl-dot {
  background: var(--orange);
  border-color: transparent;
  box-shadow: 0 0 0 5px rgba(255, 107, 44, .16);
}

.page-about .tl-ver {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .tl-node--current .tl-ver {
  color: var(--orange);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .tl-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .tl-foot {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ab-hair);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--muted);
}

@media (min-width: 820px) {
  .page-about .tl-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 28px);
  }

  .page-about .tl-line {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 13px;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan) 0%, var(--blue) 55%, var(--orange) 100%);
    opacity: .7;
  }

  .page-about .tl-node {
    padding: 36px 0 0;
  }
}

/* ============ 目录取舍 ============ */
.page-about .cut {
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 20px 22px;
}

.page-about .cut + .cut {
  margin-top: 14px;
}

.page-about .cut--drop {
  border-left: 2px solid var(--amber);
  background: linear-gradient(160deg, rgba(255, 194, 75, .07), var(--panel));
}

.page-about .cut--keep {
  border-left: 2px solid var(--green);
  background: linear-gradient(160deg, rgba(62, 208, 138, .08), var(--panel));
}

.page-about .cut-cap {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .cut--drop .cut-cap {
  color: var(--amber);
}

.page-about .cut--keep .cut-cap {
  color: var(--green);
}

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

.page-about .cut-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .cut-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background: var(--muted);
}

.page-about .cut--keep .cut-list li::before {
  background: var(--green);
}

.page-about .device-block {
  margin-top: clamp(28px, 3.6vw, 46px);
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--ab-hair);
}

.page-about .device-cap {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

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

.page-about .filter-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  padding: 8px 14px;
  border: 1px solid var(--ab-hair);
  border-radius: 2px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: border-color .2s var(--ease), color .2s var(--ease), background .2s var(--ease);
}

.page-about .filter-btn:hover {
  border-color: var(--ab-hair-strong);
  color: var(--text);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: rgba(53, 214, 232, .12);
  border-color: rgba(53, 214, 232, .54);
  color: var(--cyan);
}

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

.page-about .dev-row {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius);
  background: var(--panel-soft);
}

.page-about .dev-tag {
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .dev-name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text);
}

.page-about .dev-note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .dev-row {
    grid-template-columns: 128px minmax(0, 1fr) minmax(0, 1.25fr);
    align-items: baseline;
    gap: 20px;
  }
}

/* ============ 团队 ============ */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
  align-items: start;
}

.page-about .team-visual .tl-figure {
  margin-bottom: 14px;
}

.page-about .team-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .team-roles {
  display: grid;
  gap: 12px;
}

.page-about .team-role {
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius);
  background: var(--panel-soft);
  overflow: hidden;
  transition: border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .team-role[open] {
  background: var(--panel);
  border-color: var(--ab-hair-strong);
}

.page-about .team-summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .team-bar {
  align-self: stretch;
  min-height: 24px;
  width: 4px;
  border-radius: 2px;
  background: var(--muted);
  flex: none;
}

.page-about .team-role:nth-child(1) .team-bar {
  background: linear-gradient(180deg, var(--cyan), var(--blue));
}

.page-about .team-role:nth-child(2) .team-bar {
  background: var(--green);
}

.page-about .team-role:nth-child(3) .team-bar {
  background: var(--amber);
}

.page-about .team-role:nth-child(4) .team-bar {
  background: linear-gradient(180deg, var(--blue), var(--cyan));
}

.page-about .team-name {
  flex: 1 1 auto;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--text);
}

.page-about .team-count {
  flex: none;
  font-size: 15px;
  color: var(--cyan);
}

.page-about .team-desc {
  margin: 0;
  padding: 0 18px 18px 36px;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
    gap: clamp(34px, 4.4vw, 68px);
  }

  .page-about .team-visual {
    margin-top: 58px;
  }

  .page-about .team-roles {
    gap: 14px;
  }

  .page-about .team-role:nth-child(even) {
    margin-left: 26px;
  }
}

/* ============ 规模与稳定 ============ */
.page-about .stat-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .stat-card {
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius);
  background: linear-gradient(165deg, var(--panel), var(--panel-soft));
  box-shadow: var(--ab-shadow);
  padding: 20px 18px;
  display: grid;
  gap: 8px;
}

.page-about .stat-num {
  font-size: clamp(21px, 2.7vw, 30px);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--cyan);
  line-height: 1.16;
}

.page-about .stat-card:nth-child(4) .stat-num {
  color: var(--green);
}

.page-about .stat-cap {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .scale-rows {
  margin-top: clamp(24px, 3.2vw, 40px);
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .scale-row {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .scale-key {
  margin: 0;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-about .scale-val {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .scale-val strong {
  font-weight: 600;
  color: var(--text);
}

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

  .page-about .scale-row {
    grid-template-columns: 168px minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }
}

/* ============ 协作 ============ */
.page-about .partner-band {
  display: grid;
  gap: 22px;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(58, 107, 255, .22), transparent 60%),
    var(--panel);
  box-shadow: var(--ab-shadow);
}

.page-about .partner-lead {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--text);
  max-width: 720px;
}

@media (min-width: 760px) {
  .page-about .partner-band {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

/* ============ 收尾横幅 ============ */
.page-about .about-sec--cta {
  padding-bottom: clamp(58px, 7vw, 104px);
}

.page-about .cta-banner {
  display: grid;
  gap: 24px;
  padding: clamp(24px, 3.4vw, 40px);
  border: 1px solid var(--ab-hair-strong);
  border-radius: var(--radius);
  background:
    linear-gradient(120deg, rgba(53, 214, 232, .14) 0%, transparent 42%),
    linear-gradient(300deg, rgba(255, 107, 44, .16) 0%, transparent 48%),
    var(--panel);
  box-shadow: var(--ab-shadow);
}

.page-about .cta-copy h2 {
  margin: 0 0 12px;
  font-size: clamp(21px, 2.8vw, 30px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .cta-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--muted);
  max-width: 640px;
}

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

@media (min-width: 880px) {
  .page-about .cta-banner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }

  .page-about .cta-links {
    justify-content: flex-end;
    max-width: 420px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .idx-row:hover {
    transform: none;
  }

  .page-about .rail-dot,
  .page-about .rail-text,
  .page-about .filter-btn,
  .page-about .idx-row {
    transition: none;
  }
}
<<<END>>>