/* ============ page-about · 品牌航线 ============ */

.page-about {
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(165deg, rgba(18, 48, 72, .86) 0%, rgba(13, 36, 57, .95) 62%, rgba(6, 23, 38, 1) 100%);
  padding: clamp(22px, 3.6vw, 48px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(27, 63, 92, .26) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 63, 92, .26) 1px, transparent 1px);
  background-size: 52px 52px;
  opacity: .55;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(120% 92% at 16% 10%, #000 0%, transparent 78%);
  mask-image: radial-gradient(120% 92% at 16% 10%, #000 0%, transparent 78%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 120px;
  height: 3px;
  background: linear-gradient(90deg, var(--coral), rgba(47, 227, 214, .8));
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(27px, 3.3vw, 48px);
  line-height: 1.2;
  letter-spacing: .05em;
}

.page-about .about-hero__intro {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line-faint);
  list-style: none;
}

.page-about .about-hero__stats li {
  display: grid;
  gap: 5px;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(17px, 2vw, 23px);
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .stat-lab {
  font-size: 12.5px;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  margin: 0;
}

/* ---------- 媒体框 ---------- */
.page-about .media-frame {
  margin: 0;
  border: 1px solid var(--line-faint);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--hull);
}

.page-about .media-frame__inner {
  display: block;
  line-height: 0;
}

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

.page-about .media-frame__cap {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line-faint);
  background: rgba(6, 23, 38, .55);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(38px, 6vw, 76px);
}

.page-about .about-flow {
  min-width: 0;
  display: grid;
  gap: 0;
}

/* ---------- 左侧刻度导航 ---------- */
.page-about .about-rail {
  border: 1px dashed var(--line-faint);
  border-radius: var(--radius-sm);
  padding: 14px 14px 10px;
  background: rgba(13, 36, 57, .5);
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--mist);
}

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

.page-about .rail-list li {
  flex: 0 0 auto;
}

.page-about .rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--line-faint);
  border-radius: 999px;
  font-size: 14px;
  color: var(--mist);
  white-space: nowrap;
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--ink);
  border-color: var(--coral);
  background: rgba(255, 106, 61, .1);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: 0;
  position: relative;
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(42px, 6vw, 78px);
  padding-top: clamp(34px, 5vw, 58px);
  border-top: 1px solid var(--line-faint);
}

.page-about .about-sec__lede {
  margin: 12px 0 0;
  max-width: 48ch;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 版本时间轴 ---------- */
.page-about .tl {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 30px 28px;
  margin-left: 7px;
  border-left: 1px solid var(--line-faint);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .tl-mark {
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 106, 61, .18);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(25px, 3.2vw, 38px);
  line-height: 1;
  letter-spacing: .02em;
  color: rgba(47, 227, 214, .3);
  margin-bottom: 10px;
}

.page-about .tl-card {
  border: 1px solid var(--line-faint);
  border-radius: var(--radius-sm);
  background: var(--hull);
  padding: 16px 18px;
  transition: transform 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .tl-item:hover .tl-card {
  transform: translateY(-2px);
  border-color: rgba(255, 106, 61, .5);
  background: var(--raise);
}

.page-about .tl-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: .02em;
}

.page-about .tl-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .tl-peek {
  font-size: 13px;
  line-height: 1.65;
  color: var(--cyan);
  max-height: none;
  opacity: 1;
  overflow: hidden;
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line-faint);
  transition: max-height 260ms var(--ease), opacity 200ms var(--ease), padding-top 260ms var(--ease), border-color 260ms var(--ease);
}

/* ---------- 三类角色 ---------- */
.page-about .who-grid {
  display: grid;
  gap: 18px;
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-about .who-card {
  padding: 22px 20px;
  border-radius: var(--radius);
}

.page-about .who-card--outline {
  border: 1px solid var(--line-soft);
  background: transparent;
}

.page-about .who-card--raised {
  border: 1px solid transparent;
  background: var(--raise);
  box-shadow: var(--shadow);
}

.page-about .who-card--plate {
  border: 1px dashed var(--line-faint);
  background: linear-gradient(180deg, rgba(18, 48, 72, .72), rgba(13, 36, 57, .92));
}

.page-about .who-tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 11px;
  border: 1px solid rgba(47, 227, 214, .35);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .who-card--raised .who-tag {
  color: var(--coral-soft);
  border-color: rgba(255, 169, 138, .42);
}

.page-about .who-card h3 {
  margin: 0;
  font-size: 17.5px;
  line-height: 1.5;
  letter-spacing: .02em;
}

.page-about .who-card > p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .who-list {
  margin: 16px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-faint);
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .who-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .who-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .who-card--raised .who-list li::before {
  background: var(--coral);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence-grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-about .cadence-lead p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .cadence-links {
  margin-top: 20px;
}

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

.page-about .level-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 15px 18px;
  border-radius: var(--radius-sm);
  border-left: 3px solid currentColor;
  background: var(--hull);
}

.page-about .level-item--alert { color: var(--alert); }
.page-about .level-item--warn { color: var(--amber); }
.page-about .level-item--mint { color: var(--mint); }

.page-about .level-code {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
}

.page-about .level-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--ink);
}

/* ---------- 团队与运营 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-about .team-copy > p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .team-facts {
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-faint);
}

.page-about .team-facts > div {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-faint);
}

.page-about .team-facts dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .team-facts dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--mist);
}

.page-about .team-note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--coral);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 生态与路线图 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-about .eco-copy p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .eco-actions {
  margin-top: 20px;
}

.page-about .roadmap {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .rm-item details {
  height: 100%;
  border: 1px solid var(--line-faint);
  border-radius: var(--radius-sm);
  background: var(--hull);
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .rm-item details:hover,
.page-about .rm-item details[open] {
  border-color: rgba(47, 227, 214, .42);
  background: var(--raise);
}

.page-about .rm-item summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .rm-item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--coral);
}

.page-about .rm-item details[open] summary::after {
  content: "−";
  color: var(--cyan);
}

.page-about .rm-num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .rm-title {
  font-size: 15.5px;
  letter-spacing: .02em;
}

.page-about .rm-body {
  padding: 0 18px 16px;
}

.page-about .rm-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .rm-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  margin-top: clamp(44px, 6vw, 82px);
}

.page-about .about-cta__inner {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(118deg, rgba(255, 106, 61, .15) 0%, rgba(6, 23, 38, .92) 44%, rgba(47, 227, 214, .13) 100%);
  padding: clamp(26px, 4vw, 52px);
}

.page-about .about-cta__code {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-size: clamp(21px, 2.6vw, 33px);
  line-height: 1.35;
  letter-spacing: .04em;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 860px) {
  .page-about .who-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .who-card--raised {
    margin-top: 22px;
  }
  .page-about .who-card--plate {
    margin-top: 44px;
  }
}

@media (min-width: 880px) {
  .page-about .cadence-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    align-items: start;
  }
  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .tl-item {
    padding: 34px 18px 0 0;
    margin: 0;
    border-left: none;
    border-top: 1px solid var(--line-faint);
  }
  .page-about .tl-item:last-child {
    border-left-color: transparent;
    border-top-color: var(--line-faint);
  }
  .page-about .tl-mark {
    left: 0;
    top: -5px;
  }
  .page-about .tl-year {
    font-size: clamp(28px, 2.6vw, 38px);
  }
  .page-about .tl-peek {
    max-height: 0;
    opacity: 0;
    padding-top: 0;
    border-top-color: transparent;
  }
  .page-about .tl-item:hover .tl-peek,
  .page-about .tl-item:focus-within .tl-peek {
    max-height: 140px;
    opacity: 1;
    padding-top: 10px;
    border-top-color: var(--line-faint);
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 96px;
    padding: 18px 16px;
  }
  .page-about .rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }
  .page-about .rail-list li {
    flex: none;
  }
  .page-about .rail-list a {
    width: 100%;
    border: none;
    border-left: 2px solid var(--line-faint);
    border-radius: 0;
    padding: 9px 10px;
    background: transparent;
  }
  .page-about .rail-list a:hover,
  .page-about .rail-list a:focus-visible {
    border-left-color: var(--coral);
    background: linear-gradient(90deg, rgba(255, 106, 61, .14), transparent 72%);
  }
}

@media (min-width: 760px) {
  .page-about .roadmap {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .tl-peek,
  .page-about .rm-item details,
  .page-about .rail-list a {
    transition: none;
  }
  .page-about .tl-item:hover .tl-card {
    transform: none;
  }
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}
<<<END>>>