.page-about {
  --about-hair: rgba(139, 155, 196, .16);
  --about-cyan-soft: rgba(34, 224, 224, .12);
  --about-magenta-soft: rgba(255, 46, 126, .12);
  position: relative;
  display: block;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 40px) 0 clamp(38px, 6vw, 78px);
  background:
    radial-gradient(130% 90% at 100% 0%, rgba(255, 46, 126, .18) 0%, transparent 56%),
    radial-gradient(95% 75% at 0% 100%, rgba(34, 224, 224, .13) 0%, transparent 62%),
    var(--ink-900);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -45%;
  right: -20%;
  width: 70%;
  height: 210%;
  background: linear-gradient(150deg, rgba(22, 34, 74, .95) 0%, rgba(22, 34, 74, 0) 66%);
  transform: skewX(-16deg) rotate(3deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(180deg, rgba(234, 240, 255, .05) 0 1px, transparent 1px 5px);
  opacity: .55;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(32px, 7.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--paper);
  transform: scaleX(1.03);
  transform-origin: left center;
}

.page-about .about-hero__lead {
  max-width: 68ch;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  color: rgba(234, 240, 255, .82);
  font-size: clamp(15px, 1.55vw, 17px);
}

.page-about .about-hero__facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
}

.page-about .about-hero__fact {
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--cyan);
  background: linear-gradient(90deg, var(--about-cyan-soft), transparent 78%);
}

.page-about .about-hero__fact:nth-child(2) {
  border-left-color: var(--magenta);
  background: linear-gradient(90deg, var(--about-magenta-soft), transparent 78%);
}

.page-about .about-hero__fact:nth-child(3) {
  border-left-color: var(--amber);
  background: linear-gradient(90deg, rgba(255, 182, 39, .12), transparent 78%);
}

.page-about .about-hero__fact:nth-child(4) {
  border-left-color: var(--green);
  background: linear-gradient(90deg, rgba(75, 227, 154, .1), transparent 78%);
}

.page-about .about-hero__fact-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4vw, 34px);
  line-height: 1.1;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-hero__unit {
  margin-left: 3px;
  font-size: .5em;
  color: var(--muted);
}

.page-about .about-hero__fact-label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--muted);
}

/* ---------- 通用叙事双栏块 ---------- */

.page-about .about-block {
  position: relative;
  padding: clamp(40px, 6vw, 86px) 0;
  border-top: 1px solid var(--about-hair);
  background:
    linear-gradient(180deg, rgba(11, 18, 38, .55) 0%, rgba(5, 6, 14, 0) 34%),
    var(--ink-900);
}

.page-about .about-block__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 38px);
}

.page-about .about-block__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(25px, 3.6vw, 36px);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--paper);
  transform: scaleX(1.02);
  transform-origin: left center;
}

.page-about .about-block__note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-block__lead {
  margin-top: 0;
  font-size: clamp(16px, 1.7vw, 18px);
  color: var(--paper);
}

.page-about .about-block__body p {
  margin: 0 0 18px;
  color: rgba(234, 240, 255, .78);
}

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

/* ---------- 六个问号清单 ---------- */

.page-about .about-questions {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-questions__item {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-questions__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  line-height: 1.9;
  color: var(--cyan);
}

.page-about .about-questions__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-questions__text p {
  margin: 0;
  font-size: 15px;
  color: rgba(234, 240, 255, .72);
}

/* ---------- 制作流程 ---------- */

.page-about .about-flow {
  list-style: none;
  margin: 0 0 clamp(26px, 3.6vw, 40px);
  padding: 0;
}

.page-about .about-flow__step {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 1px solid rgba(34, 224, 224, .26);
}

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

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
}

.page-about .about-flow__step:nth-child(3)::before {
  border-color: var(--magenta);
}

.page-about .about-flow__step:nth-child(5)::before {
  border-color: var(--amber);
}

.page-about .about-flow__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .about-flow__title {
  margin: 2px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0 0 12px;
  font-size: 15px;
  color: rgba(234, 240, 255, .74);
}

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

/* ---------- 媒体容器微调（页面内） ---------- */

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.page-about .about-flow__figure img {
  border: 1px solid var(--about-hair);
  filter: saturate(.9);
}

/* ---------- 机房横带 ---------- */

.page-about .about-rig {
  position: relative;
  border-top: 1px solid var(--about-hair);
  background: var(--ink-900);
}

.page-about .about-rig__media {
  position: relative;
  overflow: hidden;
}

.page-about .about-rig__media img {
  display: block;
  width: 100%;
  height: clamp(190px, 34vw, 430px);
  object-fit: cover;
  filter: saturate(.85) contrast(1.06);
}

.page-about .about-rig__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 6, 14, .42) 0%, rgba(5, 6, 14, .95) 76%, var(--ink-900) 100%);
  pointer-events: none;
}

.page-about .about-rig__body {
  position: relative;
  z-index: 2;
  margin-top: clamp(-58px, -7vw, -120px);
  padding-bottom: clamp(40px, 6vw, 82px);
}

.page-about .about-rig__title {
  margin: 12px 0 0;
  max-width: 26ch;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(25px, 3.8vw, 38px);
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .about-rig__lead {
  max-width: 74ch;
  margin: 16px 0 0;
  color: rgba(234, 240, 255, .78);
}

.page-about .about-rig__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3vw, 32px);
  border: 1px solid var(--about-hair);
  background: var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-rig__stat {
  padding: 16px 16px 14px;
  background: rgba(11, 18, 38, .88);
}

.page-about .about-rig__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-rig__stat-unit {
  font-size: .62em;
  color: var(--muted);
}

.page-about .about-rig__stat-label {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-tier {
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-tier__row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  align-items: center;
  gap: 10px 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-tier__key {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .about-tier__bar {
  position: relative;
  height: 9px;
  border-radius: 999px;
  background: rgba(139, 155, 196, .16);
  overflow: hidden;
}

.page-about .about-tier__fill {
  position: absolute;
  inset: 0 auto 0 0;
  border-radius: inherit;
  display: block;
}

.page-about .about-tier__fill--min {
  width: 42%;
  background: linear-gradient(90deg, var(--cyan), rgba(34, 224, 224, .22));
}

.page-about .about-tier__fill--rec {
  width: 88%;
  background: linear-gradient(90deg, var(--magenta), rgba(255, 46, 126, .2));
}

.page-about .about-tier__val {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .01em;
  color: var(--muted);
}

.page-about .about-tier__note {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 阶段时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0 0 clamp(26px, 3.6vw, 40px);
  padding: 0 0 0 22px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(34, 224, 224, .55) 0%, rgba(255, 46, 126, .55) 100%);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 18px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
}

.page-about .about-timeline__item--now::before {
  border-color: var(--magenta);
  box-shadow: 0 0 0 4px rgba(255, 46, 126, .16);
}

.page-about .about-timeline__box {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-timeline__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 13px 0 14px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.34;
  color: var(--paper);
}

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

.page-about .about-timeline__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-timeline__box[open] .about-timeline__sum::after {
  content: "–";
  color: var(--magenta);
}

.page-about .about-timeline__stage {
  flex: 0 0 auto;
  padding: 2px 9px;
  border: 1px solid var(--line-cyan);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .about-timeline__item--now .about-timeline__stage {
  border-color: var(--line-magenta);
  color: var(--magenta);
}

.page-about .about-timeline__detail {
  padding: 0 0 18px;
  font-size: 15px;
  color: rgba(234, 240, 255, .74);
}

.page-about .about-timeline__detail p {
  margin: 0;
}

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

.page-about .about-timeline__figure img {
  border: 1px solid var(--about-hair);
  filter: saturate(.88) brightness(.94);
}

/* ---------- 协同 ---------- */

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 3vw, 32px);
  border: 1px solid var(--about-hair);
  background: var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-partners__cell {
  padding: 16px 18px;
  background: linear-gradient(135deg, rgba(22, 34, 74, .72), rgba(11, 18, 38, .9));
}

.page-about .about-partners__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-partners__unit {
  font-size: .58em;
  color: var(--muted);
}

.page-about .about-partners__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 自定标准 ---------- */

.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-rules__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-rules__key {
  align-self: start;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--green);
}

.page-about .about-rules__text {
  margin: 0;
  font-size: 15px;
  color: rgba(234, 240, 255, .76);
}

/* ---------- 出口链接 ---------- */

.page-about .about-links {
  margin-top: clamp(26px, 3.6vw, 38px);
  padding: 20px 0 0;
  border-top: 1px dashed rgba(34, 224, 224, .3);
}

.page-about .about-links__lead {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-links__list {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about .about-links__link {
  display: block;
  padding: 11px 14px;
  border: 1px solid var(--about-hair);
  border-left: 2px solid var(--magenta);
  border-radius: var(--radius-sm);
  background: rgba(11, 18, 38, .6);
  color: var(--paper);
  font-size: 14.5px;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-links__link:hover,
.page-about .about-links__link:focus-visible {
  border-color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(34, 224, 224, .08);
  transform: translateX(3px);
}

/* ---------- 平板及以上 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-rig__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-tier__row {
    grid-template-columns: 68px minmax(0, 160px) minmax(0, 1fr);
    gap: 16px;
  }

  .page-about .about-tier__val {
    grid-column: auto;
  }

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

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

/* ---------- 桌面叙事双栏 ---------- */

@media (min-width: 980px) {
  .page-about .about-block__inner {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 76px);
  }

  .page-about .about-block__side {
    position: sticky;
    top: clamp(96px, 12vh, 148px);
    align-self: start;
  }

  .page-about .about-rig__body {
    padding-bottom: clamp(56px, 6vw, 96px);
  }

  .page-about .about-rules__item {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 18px;
  }

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

/* ---------- 动效偏好 ---------- */

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

  .page-about .about-links__link:hover,
  .page-about .about-links__link:focus-visible {
    transform: none;
  }

  .page-about .about-hero__title,
  .page-about .about-block__title {
    transform: none;
  }
}