.page-about {
  --about-hair: rgba(31, 35, 43, 0.95);
  --about-cyan-soft: rgba(0, 229, 255, 0.12);
  padding-bottom: clamp(40px, 7vw, 96px);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 5vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .breadcrumb__link {
  color: var(--cold);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--lime);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(29px, 5.4vw, 56px);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--mist);
  background-image: linear-gradient(102deg, #00E5FF 0%, #F2F5F7 66%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-hero__text {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--cold);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__board {
  position: relative;
  padding: clamp(18px, 3vw, 28px);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(0, 229, 255, 0.14), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 94, 58, 0.12), transparent 60%),
    var(--ink-panel);
  border: 1px solid var(--ink-circuit);
  clip-path: polygon(
    var(--chamfer) 0,
    100% 0,
    100% calc(100% - var(--chamfer)),
    calc(100% - var(--chamfer)) 100%,
    0 100%,
    0 var(--chamfer)
  );
}

.page-about .about-board__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-board__cap {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--lead);
}

.page-about .about-board__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-board__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 10px;
  border-left: 2px solid var(--about-cyan-soft);
}

.page-about .about-board__stats .stat__value {
  font-family: var(--font-tech);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

.page-about .about-board__stats .stat__label {
  font-size: 13px;
  color: var(--cold);
}

/* ---------- 首屏主视觉 ---------- */
.page-about .about-band {
  margin: clamp(30px, 5vw, 58px) 0 0;
}

.page-about .about-band .media-frame {
  border: 1px solid var(--ink-circuit);
}

.page-about .about-band figcaption {
  margin-top: 10px;
}

/* ---------- 章节流骨架 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(22px, 3.6vw, 40px);
  padding-top: clamp(34px, 6vw, 76px);
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-tech);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--lead);
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__link {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  padding: 7px 11px;
  border: 1px solid var(--ink-circuit);
  background: var(--ink-panel);
  color: var(--cold);
  font-size: 13px;
  line-height: 1.35;
  text-decoration: none;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-rail__ver {
  font-family: var(--font-tech);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--lead);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--lime);
  color: var(--mist);
}

.page-about .about-rail__link:hover .about-rail__ver {
  color: var(--cyan);
}

/* ---------- 正文块 ---------- */
.page-about .about-flow__body {
  min-width: 0;
}

.page-about .about-block {
  padding-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-block + .about-block {
  margin-top: clamp(34px, 5vw, 64px);
}

.page-about .section-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 3.2vw, 32px);
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--mist);
}

.page-about .section-head::after {
  content: "";
  flex: 0 0 auto;
  width: clamp(38px, 6vw, 58px);
  height: 3px;
  background: var(--holo);
  transform: rotate(-12deg);
  opacity: 0.85;
}

.page-about .about-block__intro {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--cold);
}

.page-about .about-block__grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  margin-top: 22px;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.4);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-note {
  padding: 18px;
  background: linear-gradient(160deg, rgba(0, 229, 255, 0.08), transparent 70%), var(--ink-panel);
  border: 1px solid var(--ink-circuit);
  border-left: 2px solid var(--cyan);
}

.page-about .about-note__label {
  margin: 0 0 10px;
  font-family: var(--font-tech);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-note__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-note__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cold);
}

.page-about .about-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--lava);
  transform: rotate(45deg);
}

.page-about .about-note__list li:last-child {
  margin-bottom: 0;
}

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

.page-about .about-block__figure .media-frame {
  border: 1px solid var(--ink-circuit);
}

.page-about .about-block__figure figcaption {
  margin-top: 10px;
}

/* ---------- 四次跃迁 ---------- */
.page-about .about-stages {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-stage {
  position: relative;
  overflow: hidden;
  padding: 22px 20px 20px;
  background: linear-gradient(152deg, rgba(0, 229, 255, 0.07), transparent 58%), var(--ink-panel);
  border: 1px solid var(--ink-circuit);
  clip-path: polygon(
    var(--chamfer-sm) 0,
    100% 0,
    100% calc(100% - var(--chamfer-sm)),
    calc(100% - var(--chamfer-sm)) 100%,
    0 100%,
    0 var(--chamfer-sm)
  );
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease),
    background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-stage:hover,
.page-about .about-stage:focus-within {
  transform: translateY(-2px);
  border-color: rgba(0, 229, 255, 0.55);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
  background: linear-gradient(152deg, rgba(0, 229, 255, 0.14), transparent 62%), var(--ink-panel);
}

.page-about .about-stage__mark {
  position: absolute;
  top: -8px;
  right: 8px;
  font-family: var(--font-tech);
  font-weight: 700;
  font-size: clamp(38px, 6vw, 54px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(0, 229, 255, 0.09);
  pointer-events: none;
}

.page-about .about-stage__title {
  position: relative;
  margin: 0 0 10px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-stage__text {
  position: relative;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cold);
}

.page-about .about-stage__tags {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stage__tags li {
  padding: 3px 8px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  border: 1px solid rgba(0, 229, 255, 0.32);
  background: rgba(0, 229, 255, 0.06);
}

/* ---------- 12 栏目 ---------- */
.page-about .about-columns {
  display: grid;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-columns__item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 12px 14px;
  background: var(--ink-panel);
  border-left: 2px solid var(--ink-circuit);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-columns__item:hover {
  border-left-color: var(--lime);
  background: rgba(31, 35, 43, 0.85);
}

.page-about .about-columns__num {
  font-family: var(--font-tech);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-columns__name {
  display: block;
  font-weight: 600;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-columns__ask {
  display: block;
  margin-top: 2px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--lead);
}

/* ---------- 团队 ---------- */
.page-about .about-team__stack {
  display: flex;
  height: 14px;
  overflow: hidden;
  margin-bottom: 20px;
  background: var(--ink-circuit);
}

.page-about .about-team__seg {
  display: block;
  height: 100%;
}

.page-about .about-team__seg--support {
  width: 32.4%;
  background: linear-gradient(90deg, #00E5FF, #049db0);
}

.page-about .about-team__seg--content {
  width: 26.5%;
  background: linear-gradient(90deg, #FF5E3A, #b83d20);
}

.page-about .about-team__seg--tech {
  width: 22%;
  background: linear-gradient(90deg, #C8FF00, #86ab00);
}

.page-about .about-team__seg--ops {
  width: 19.1%;
  background: #39404d;
}

.page-about .about-team__rows {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__row {
  padding: 12px 0;
  border-bottom: 1px dashed var(--about-hair);
}

.page-about .about-team__row:last-child {
  border-bottom: 0;
}

.page-about .about-team__line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .about-team__name {
  font-weight: 600;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-team__count {
  font-family: var(--font-tech);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-team__track {
  height: 6px;
  margin: 8px 0 8px;
  background: var(--ink-circuit);
}

.page-about .about-team__bar {
  display: block;
  height: 100%;
  transition: filter 0.25s var(--ease);
}

.page-about .about-team__row:hover .about-team__bar {
  filter: brightness(1.25);
}

.page-about .about-team__bar--support {
  width: 32.4%;
  background: var(--cyan);
}

.page-about .about-team__bar--content {
  width: 26.5%;
  background: var(--lava);
}

.page-about .about-team__bar--tech {
  width: 22.1%;
  background: var(--lime);
}

.page-about .about-team__bar--ops {
  width: 19.1%;
  background: var(--lead);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--cold);
}

.page-about .about-team__foot {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cold);
}

/* ---------- 节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cadence__item {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 16px 16px 18px;
  background: var(--ink-panel);
  border: 1px solid var(--ink-circuit);
  border-top: 2px solid rgba(255, 94, 58, 0.55);
  transition: border-top-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-cadence__item:hover {
  transform: translateY(-2px);
  border-top-color: var(--lava);
}

.page-about .about-cadence__key {
  font-family: var(--font-tech);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--lava);
  align-self: start;
}

.page-about .about-cadence__title {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 16px;
  color: var(--mist);
}

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

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 60px);
  padding: clamp(22px, 4vw, 34px);
  display: grid;
  gap: 18px;
  background:
    radial-gradient(110% 100% at 0% 0%, rgba(255, 94, 58, 0.16), transparent 62%),
    radial-gradient(120% 100% at 100% 100%, rgba(0, 229, 255, 0.16), transparent 66%),
    var(--ink-panel);
  border: 1px solid var(--ink-circuit);
  clip-path: polygon(
    var(--chamfer) 0,
    100% 0,
    100% calc(100% - var(--chamfer)),
    calc(100% - var(--chamfer)) 100%,
    0 100%,
    0 var(--chamfer)
  );
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.8vw, 26px);
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-cta__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-columns {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
}

@media (min-width: 760px) {
  .page-about .about-block__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-block__grid--flip {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  }

  .page-about .about-block__grid--flip .about-block__figure {
    order: -1;
  }

  .page-about .about-stages {
    grid-template-columns: 1fr 1fr;
  }

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

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-flow {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(30px, 4.4vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail__list {
    display: block;
    position: relative;
    padding-left: 22px;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: linear-gradient(180deg, var(--cyan), rgba(0, 229, 255, 0.22) 48%, var(--lava));
    opacity: 0.6;
  }

  .page-about .about-rail__list li {
    margin-bottom: 4px;
  }

  .page-about .about-rail__link {
    display: block;
    padding: 7px 0;
    border: 0;
    background: transparent;
    font-size: 14px;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -22px;
    top: 13px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid var(--ink-circuit);
    background: var(--ink-void);
    transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease),
      transform 0.25s var(--ease);
  }

  .page-about .about-rail__link {
    position: relative;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border: 0;
    color: var(--mist);
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    border-color: var(--lime);
    transform: scale(1.12);
    box-shadow: 0 0 0 4px rgba(200, 255, 0, 0.12);
  }
}

@media (min-width: 1080px) {
  .page-about .about-flow {
    grid-template-columns: 200px minmax(0, 1fr);
  }

  .page-about .about-cadence {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-cadence__item,
  .page-about .about-team__bar,
  .page-about .about-rail__link::before {
    transition: none;
  }

  .page-about .about-stage:hover,
  .page-about .about-cadence__item:hover {
    transform: none;
  }
}