.page-about {
  background:
    radial-gradient(120% 70% at 88% -12%, rgba(164, 92, 255, .20), transparent 62%),
    radial-gradient(80% 55% at -5% 4%, rgba(255, 122, 47, .14), transparent 60%),
    var(--c-ink);
  color: var(--c-white);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(20px, 4vw, 44px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 180px;
  background-image: repeating-linear-gradient(115deg, rgba(255, 122, 47, .10) 0 2px, transparent 2px 24px);
  -webkit-mask-image: linear-gradient(to top, #000, transparent);
  mask-image: linear-gradient(to top, #000, transparent);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__copy h1 {
  margin: 16px 0 0;
  max-width: 640px;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 42ch;
  color: var(--c-mist);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--c-ink-2);
  clip-path: polygon(0 5%, 100% 0, 100% 100%, 0 95%);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 8 / 5;
}

.page-about .about-hero__cap {
  position: absolute;
  left: 18px;
  bottom: 20px;
  padding: 6px 12px;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-white);
  background: rgba(7, 21, 48, .74);
  border-left: 3px solid var(--c-orange);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 1;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--c-ink);
}

.page-about .about-fact__v {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
  letter-spacing: .01em;
}

.page-about .about-fact__u {
  margin-left: 5px;
  font-size: .48em;
  color: var(--c-mist);
  letter-spacing: .02em;
}

.page-about .about-fact__k {
  font-size: 13px;
  color: var(--c-mist);
  letter-spacing: .02em;
}

/* ---------- 合作对象 ---------- */
.page-about .about-who__grid {
  display: grid;
  gap: clamp(16px, 2.5vw, 26px);
  margin-top: clamp(24px, 3.5vw, 42px);
}

.page-about .about-profile {
  position: relative;
  padding: clamp(24px, 3vw, 32px) clamp(20px, 2.6vw, 28px) clamp(22px, 2.8vw, 30px);
  background: var(--c-panel);
  border: 1px solid var(--line);
}

.page-about .about-profile .panel__num {
  display: block;
  margin-bottom: 16px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-purple);
}

.page-about .about-profile__t {
  margin: 0 0 12px;
  font-size: clamp(19px, 2vw, 22px);
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-profile__d {
  margin: 0;
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-profile__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 18px 0 0;
  border-top: 1px dashed var(--line-strong);
  display: grid;
  gap: 10px;
}

.page-about .about-profile__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  color: var(--c-white);
  line-height: 1.6;
}

.page-about .about-profile__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--c-orange);
  transform: rotate(45deg);
}

/* ---------- 覆盖版图 ---------- */
.page-about .about-map-section {
  background: linear-gradient(180deg, rgba(14, 42, 79, .55), rgba(7, 21, 48, 0));
}

.page-about .about-map {
  position: relative;
  margin-top: clamp(22px, 3.2vw, 38px);
  min-height: 360px;
  border: 1px solid var(--line);
  background: var(--c-ink-2);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .about-map__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .26;
  filter: saturate(.7) contrast(1.08);
}

.page-about .about-map::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(70% 90% at 46% 58%, rgba(255, 122, 47, .16), transparent 62%),
    linear-gradient(160deg, rgba(7, 21, 48, .78), rgba(7, 21, 48, .92));
  pointer-events: none;
}

.page-about .about-map__grid {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.page-about .about-map__nodes {
  position: absolute;
  inset: 0;
  z-index: 2;
}

.page-about .about-node {
  position: absolute;
  left: var(--x);
  top: var(--y);
  transform: translate(-50%, -50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 62px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c-white);
  background: rgba(28, 36, 51, .86);
  border: 1px solid var(--c-cyan);
  border-radius: 999px;
  cursor: default;
  outline: none;
}

.page-about .about-node--hot {
  min-width: 84px;
  font-size: 15px;
  padding: 11px 18px;
  color: var(--c-ink);
  background: var(--c-orange);
  border-color: var(--c-orange);
  box-shadow: 0 0 0 6px rgba(164, 92, 255, .34), 0 0 30px rgba(255, 122, 47, .5);
}

.page-about .about-node__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translate(-50%, 6px);
  width: max-content;
  max-width: 190px;
  padding: 7px 11px;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0;
  color: var(--c-ink);
  background: var(--c-yellow);
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s ease, transform .2s ease, visibility .2s;
  pointer-events: none;
}

.page-about .about-node:hover .about-node__tip,
.page-about .about-node:focus-visible .about-node__tip {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.page-about .about-map__note {
  position: absolute;
  left: 18px;
  bottom: 16px;
  z-index: 3;
  margin: 0;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-mist);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .about-stages__list {
  list-style: none;
  margin: clamp(24px, 3.5vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-stage {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
}

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

.page-about .about-stage__marker::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 0;
  bottom: calc(-1 * clamp(20px, 3vw, 34px));
  width: 1px;
  background: linear-gradient(to bottom, var(--line-strong), var(--line));
}

.page-about .about-stage:last-child .about-stage__marker::before {
  bottom: 0;
  background: linear-gradient(to bottom, var(--line-strong), transparent);
}

.page-about .about-stage__dot {
  position: absolute;
  left: 1px;
  top: 30px;
  width: 17px;
  height: 17px;
  background: var(--c-ink);
  border: 1px solid var(--line-strong);
  transform: rotate(45deg);
}

.page-about .about-stage:nth-child(1) .about-stage__dot {
  background: var(--c-orange);
  border-color: var(--c-orange);
  box-shadow: 0 0 0 5px rgba(255, 122, 47, .16);
}

.page-about .about-stage:nth-child(2) .about-stage__dot {
  background: var(--c-purple);
  border-color: var(--c-purple);
  box-shadow: 0 0 0 5px rgba(164, 92, 255, .16);
}

.page-about .about-stage:nth-child(3) .about-stage__dot {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 5px rgba(63, 193, 201, .16);
}

.page-about .about-stage__card {
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-stage__card--dark {
  background: var(--c-panel);
}

.page-about .about-stage__card--blue {
  background: linear-gradient(150deg, var(--c-ink-2), rgba(28, 36, 51, .9));
  border-color: rgba(164, 92, 255, .38);
}

.page-about .about-stage__idx {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-yellow);
}

.page-about .about-stage__t {
  margin: 12px 0 12px;
  font-size: clamp(20px, 2.3vw, 26px);
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-stage__card p {
  margin: 0;
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 60ch;
}

.page-about .about-stage__meta {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px dashed var(--line-strong);
  display: grid;
  gap: 12px;
}

.page-about .about-stage__meta dt {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-mist);
}

.page-about .about-stage__meta dd {
  margin: 5px 0 0;
  font-size: 14px;
  color: var(--c-orange);
}

/* ---------- 承接能力 ---------- */
.page-about .about-cap__grid {
  display: grid;
  gap: clamp(24px, 3.5vw, 48px);
  align-items: start;
}

.page-about .about-cap__main .prose {
  margin: clamp(16px, 2.2vw, 24px) 0 0;
  max-width: 42ch;
  color: var(--c-mist);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-meters {
  display: grid;
  gap: 22px;
  margin-top: clamp(24px, 3vw, 36px);
  padding: clamp(20px, 2.6vw, 28px);
  background: rgba(28, 36, 51, .72);
  border: 1px solid var(--line);
  border-left: 3px solid var(--c-orange);
}

.page-about .about-meter__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .about-meter__label {
  font-size: 14px;
  color: var(--c-white);
}

.page-about .about-meter__val {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-yellow);
  letter-spacing: .02em;
}

.page-about .about-meter__track {
  display: block;
  height: 8px;
  background: rgba(126, 147, 174, .18);
  overflow: hidden;
}

.page-about .about-meter__fill {
  display: block;
  height: 100%;
  width: var(--v);
  transform-origin: left center;
}

.page-about .about-meter__fill--orange {
  background: linear-gradient(90deg, var(--c-orange-deep), var(--c-orange));
}

.page-about .about-meter__fill--cyan {
  background: linear-gradient(90deg, #1f7f86, var(--c-cyan));
}

.page-about .about-cap__points {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-about .about-cap__points li {
  background: var(--c-ink);
  padding: 20px 0 20px 18px;
  border-left: 2px solid transparent;
  transition: border-color .25s ease;
}

.page-about .about-cap__points li:hover {
  border-left-color: var(--c-purple);
}

.page-about .about-cap__pt {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.005em;
}

.page-about .about-cap__points p {
  margin: 0;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.8;
  max-width: 52ch;
}

.page-about .about-cap__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  clip-path: polygon(7% 0, 100% 0, 100% 100%, 0 100%);
  background: var(--c-ink-2);
}

.page-about .about-cap__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-cap__cap {
  position: absolute;
  left: 22px;
  bottom: 16px;
  padding: 5px 11px;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-white);
  background: rgba(7, 21, 48, .76);
  border-bottom: 2px solid var(--c-cyan);
}

/* ---------- 验收标准 ---------- */
.page-about .about-std__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-std__item {
  padding: clamp(22px, 3vw, 32px);
  background: var(--c-ink-2);
  position: relative;
}

.page-about .about-std__item:nth-child(2) {
  background: var(--c-panel);
}

.page-about .about-std__num {
  display: block;
  font-size: 26px;
  font-weight: 700;
  color: rgba(126, 147, 174, .5);
  letter-spacing: .04em;
}

.page-about .about-std__t {
  margin: 14px 0 12px;
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 800;
}

.page-about .about-std__item p {
  margin: 0;
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-std__foot {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 20px 24px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-white);
  background: rgba(63, 193, 201, .10);
  border-left: 3px solid var(--c-cyan);
  max-width: 78ch;
}

/* ---------- 长期合作 ---------- */
.page-about .about-why__inner {
  padding: clamp(26px, 4vw, 54px);
  background: linear-gradient(140deg, rgba(255, 122, 47, .14), rgba(164, 92, 255, .14) 55%, rgba(63, 193, 201, .12));
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .about-why__list {
  list-style: none;
  margin: clamp(22px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 22px 32px;
}

.page-about .about-why__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .about-why__mark {
  width: 12px;
  height: 12px;
  margin-top: 6px;
  background: var(--c-orange);
  transform: rotate(45deg);
}

.page-about .about-why__item:nth-child(2) .about-why__mark {
  background: var(--c-purple);
}

.page-about .about-why__item:nth-child(3) .about-why__mark {
  background: var(--c-cyan);
}

.page-about .about-why__item:nth-child(4) .about-why__mark {
  background: var(--c-yellow);
}

.page-about .about-why__t {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.005em;
}

.page-about .about-why__item p {
  margin: 0;
  color: var(--c-mist);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .about-why__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.5vw, 42px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--line-strong);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cap__points li {
    padding-left: 24px;
  }

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

@media (min-width: 760px) {
  .page-about .about-stage {
    grid-template-columns: 64px minmax(0, 1fr);
  }

  .page-about .about-stage__marker::before {
    left: 15px;
  }

  .page-about .about-stage__dot {
    left: 7px;
  }

  .page-about .about-stage__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

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

  .page-about .about-map {
    min-height: 440px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

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

  .page-about .about-profile--b {
    margin-top: 34px;
  }

  .page-about .about-profile--c {
    margin-top: 68px;
  }

  .page-about .about-cap__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }
}

@media (min-width: 1080px) {
  .page-about .about-map {
    min-height: 500px;
  }

  .page-about .about-map__note {
    left: 28px;
    bottom: 22px;
  }
}

@media (max-width: 480px) {
  .page-about .about-node {
    min-width: 50px;
    padding: 5px 9px;
    font-size: 11px;
  }

  .page-about .about-node--hot {
    min-width: 66px;
    font-size: 13px;
    padding: 8px 13px;
  }

  .page-about .about-node__tip {
    display: none;
  }

  .page-about .about-map__note {
    font-size: 10px;
    right: 18px;
  }
}

.page-about {
  --v: 1rem;
  --x: inherit;
  --y: inherit;
}