.page-about {
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  align-items: end;
  padding-top: clamp(20px, 3vw, 36px);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .about-hero-visual {
  margin: 0;
  order: 2;
}

.page-about .about-hero-text {
  order: 1;
  min-width: 0;
}

.page-about .about-hero-frame {
  position: relative;
  aspect-ratio: 5 / 4;
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), calc(100% - 44px) 100%, 0 100%);
}

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

.page-about .about-hero-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 8, 15, 0) 48%, rgba(5, 8, 15, 0.9) 100%);
  pointer-events: none;
}

.page-about .about-hero-cap {
  display: block;
  margin-top: 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mute);
  text-transform: uppercase;
}

.page-about .about-h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 7.4vw, 104px);
  line-height: 0.92;
  letter-spacing: -0.04em;
  color: var(--fog);
}

.page-about .about-hero-lead {
  max-width: 42ch;
  margin: clamp(16px, 2.4vw, 28px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--volt);
  color: var(--mute);
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.78;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero-stats .stat {
  background: var(--ink-2);
  padding: 16px 18px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--volt);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-unit {
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--fog);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--mute);
}

/* ---------- 双栏主体 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .about-rail {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
  min-width: 0;
}

.page-about .rail-inner {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .rail-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--flame);
}

.page-about .rail-line {
  margin: 0;
  max-width: 30ch;
  color: var(--fog);
  font-size: 14px;
  line-height: 1.65;
}

.page-about .rail-index {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--mute);
  font-size: 13px;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .rail-index a:hover,
.page-about .rail-index a:focus-visible {
  color: var(--volt);
  border-color: var(--volt);
}

.page-about .rail-index .mono {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--volt);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(48px, 7vw, 96px);
  min-width: 0;
}

/* ---------- 章节头 ---------- */
.page-about .sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 18px;
  margin-bottom: clamp(20px, 3vw, 36px);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .sec-num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--flame);
  border: 1px solid var(--line);
  padding: 3px 8px;
}

.page-about .sec-title {
  flex: 1 1 260px;
  margin: 0;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .sec-lead {
  flex-basis: 100%;
  margin: 0;
  max-width: 48ch;
  color: var(--mute);
  font-size: 15px;
  line-height: 1.78;
}

/* ---------- 01 品牌由来 ---------- */
.page-about .name-cols {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .name-quote {
  margin: 0;
  padding-left: clamp(14px, 2vw, 22px);
  border-left: 3px solid var(--volt);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.8vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .name-quote em {
  font-style: normal;
  color: var(--volt);
}

.page-about .name-body p {
  max-width: 42ch;
  margin: 0 0 1.1em;
  color: var(--mute);
  font-size: 16px;
  line-height: 1.8;
}

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

.page-about .name-points li {
  position: relative;
  padding-left: 26px;
  color: var(--fog);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .name-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 14px;
  height: 1px;
  background: var(--volt);
}

/* ---------- 02 团队 ---------- */
.page-about .team-figure {
  margin: 0 0 clamp(24px, 3vw, 36px);
}

.page-about .team-figure .media-frame {
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-about .team-figure-cap {
  display: block;
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mute);
  text-transform: uppercase;
}

.page-about .team-board {
  display: grid;
  gap: 18px;
}

.page-about .team-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.page-about .team-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .team-tabs label {
  cursor: pointer;
  padding: 8px 14px;
  border: 1px solid var(--line);
  color: var(--mute);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .team-tabs label:hover {
  color: var(--volt);
  border-color: var(--volt);
}

.page-about #team-all:checked ~ .team-tabs label[for="team-all"],
.page-about #team-content:checked ~ .team-tabs label[for="team-content"],
.page-about #team-data:checked ~ .team-tabs label[for="team-data"],
.page-about #team-service:checked ~ .team-tabs label[for="team-service"] {
  background: var(--volt);
  border-color: var(--volt);
  color: var(--ink);
  font-weight: 700;
}

.page-about #team-all:focus-visible ~ .team-tabs label[for="team-all"],
.page-about #team-content:focus-visible ~ .team-tabs label[for="team-content"],
.page-about #team-data:focus-visible ~ .team-tabs label[for="team-data"],
.page-about #team-service:focus-visible ~ .team-tabs label[for="team-service"] {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .team-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about #team-content:checked ~ .team-grid .team-card:not(.team-card--content),
.page-about #team-data:checked ~ .team-grid .team-card:not(.team-card--data),
.page-about #team-service:checked ~ .team-grid .team-card:not(.team-card--service) {
  display: none;
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--ink-2);
  transition: background var(--dur) var(--ease);
}

.page-about .team-card:hover {
  background: #0e1c2e;
}

.page-about .team-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-about .team-icon {
  width: 30px;
  height: 30px;
  flex: none;
  fill: none;
  stroke: var(--volt);
  stroke-width: 1.6;
  stroke-linecap: square;
}

.page-about .team-card--data .team-icon {
  stroke: var(--cyan);
}

.page-about .team-card--service .team-icon {
  stroke: var(--flame);
}

.page-about .team-count {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--flame);
  font-variant-numeric: tabular-nums;
}

.page-about .team-count .unit {
  font-size: 12px;
  margin-left: 2px;
  color: var(--mute);
}

.page-about .team-name {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .team-desc {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .team-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .team-list li {
  padding: 3px 8px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--fog);
}

/* ---------- 03 流水线 ---------- */
.page-about .pipe-steps {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .pipe-step {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  padding-left: clamp(26px, 3vw, 36px);
  background: var(--ink-2);
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .pipe-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--volt);
}

.page-about .pipe-step:nth-child(2)::before {
  background: var(--flame);
}

.page-about .pipe-step:nth-child(3)::before {
  background: var(--cyan);
}

.page-about .pipe-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .pipe-num {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--volt);
}

.page-about .pipe-step:nth-child(2) .pipe-num {
  color: var(--flame);
}

.page-about .pipe-step:nth-child(3) .pipe-num {
  color: var(--cyan);
}

.page-about .pipe-meta {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mute);
  white-space: nowrap;
}

.page-about .pipe-title {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.3;
  color: var(--fog);
}

.page-about .pipe-text {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.78;
}

/* ---------- 04 时间线 ---------- */
.page-about .tl-stage {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 48px);
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .tl-backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .tl-backdrop img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  filter: saturate(0.6);
}

.page-about .tl-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(5, 8, 15, 0.97) 0%, rgba(5, 8, 15, 0.72) 55%, rgba(5, 8, 15, 0.95) 100%);
}

.page-about .tl {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid rgba(198, 255, 61, 0.35);
  display: grid;
  gap: clamp(22px, 3vw, 38px);
}

.page-about .tl-item {
  position: relative;
  padding-right: 4px;
  outline-offset: 6px;
}

.page-about .tl-dot {
  position: absolute;
  left: -30px;
  top: 8px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--volt);
  background: var(--ink);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:focus-within .tl-dot {
  background: var(--volt);
}

.page-about .tl-content {
  display: grid;
  gap: 8px;
  justify-items: start;
}

.page-about .tl-year {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid rgba(198, 255, 61, 0.45);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--volt);
}

.page-about .tl-title {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.32;
  color: var(--fog);
}

.page-about .tl-desc {
  margin: 0;
  max-width: 52ch;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.78;
}

.page-about .tl-extra {
  margin: 0;
  max-width: 52ch;
  color: var(--fog);
  font-size: 13px;
  line-height: 1.7;
  opacity: 0.9;
}

.page-about .tl-extra a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(50, 230, 200, 0.5);
}

.page-about .tl-extra a:hover {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

/* ---------- 05 生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .eco-card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--ink-2);
}

.page-about .eco-num {
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .eco-mark {
  display: inline-block;
  justify-self: start;
  padding: 3px 8px;
  border: 1px solid var(--violet);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--violet);
}

.page-about .eco-title {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.35;
  color: var(--fog);
}

.page-about .eco-text {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .eco-more {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  color: var(--mute);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .eco-more a {
  color: var(--volt);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, 0.45);
}

.page-about .eco-more a:hover {
  border-bottom-color: var(--volt);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  border: 1px solid var(--line);
  border-left: 4px solid var(--volt);
  background: linear-gradient(120deg, rgba(198, 255, 61, 0.08) 0%, rgba(11, 22, 38, 0.9) 42%, var(--ink-2) 100%);
  padding: clamp(24px, 3.6vw, 44px);
}

.page-about .cta-title {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .cta-text {
  margin: 14px 0 0;
  max-width: 50ch;
  color: var(--mute);
  font-size: 15px;
  line-height: 1.78;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .name-cols {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
  }

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

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

@media (min-width: 860px) {
  .page-about .pipe-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-hero-visual {
    order: 1;
  }

  .page-about .about-hero-text {
    order: 2;
  }

  .page-about .about-hero-frame {
    aspect-ratio: 4 / 5;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 240px minmax(0, 1fr);
    align-items: start;
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    border-bottom: 1px solid var(--line);
    padding: 20px 0 24px;
  }

  .page-about .rail-index {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding: 0;
  }

  .page-about .rail-index a {
    border: 0;
    border-left: 2px solid var(--line);
    padding: 10px 0 10px 14px;
    white-space: normal;
    font-size: 14px;
  }

  .page-about .rail-index a:hover,
  .page-about .rail-index a:focus-visible {
    border-left-color: var(--volt);
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .tl-extra {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s var(--ease), opacity 0.2s var(--ease), margin-top 0.3s var(--ease);
  }

  .page-about .tl-item:hover .tl-extra,
  .page-about .tl-item:focus-within .tl-extra {
    max-height: 180px;
    margin-top: 2px;
    opacity: 0.9;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-extra {
    transition: none;
  }

  .page-about .team-card {
    transition: none;
  }

  .page-about .tl-dot {
    transition: none;
  }
}