/* ============ 我们是谁 · 页面专属样式（作用域 .page-about） ============ */

.page-about {
  --about-top-pad: clamp(88px, 11vw, 116px);
  background: var(--ink-900);
  color: var(--white);
  overflow-x: clip;
}

.page-about .about-crumb-wrap {
  padding-block-start: var(--about-top-pad);
}

.page-about .crumb-sep {
  margin-inline: 8px;
  color: var(--line);
}

.page-about .crumb-now {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: rgba(245, 243, 247, 0.62);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(28px, 5vw, 52px) clamp(24px, 4vw, 40px);
  position: relative;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-inline-start: calc(-1 * var(--gutter));
  inset-block-start: 8%;
  width: min(560px, 70vw);
  height: min(560px, 70vw);
  background: radial-gradient(circle at 30% 30%, rgba(124, 59, 255, 0.22), rgba(124, 59, 255, 0) 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-kicker {
  color: var(--purple-2);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  margin: 0;
}

.page-about .about-title {
  margin: 20px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.05rem, 5.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 15em;
}

.page-about .about-title .hl {
  color: var(--orange);
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 68ch;
  font-size: clamp(15.5px, 1.5vw, 17.5px);
  line-height: 1.78;
  color: rgba(245, 243, 247, 0.82);
}

/* ---------- 主体：4/8 不对称分栏 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-block-end: clamp(56px, 9vw, 110px);
}

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

.page-about .about-body {
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    column-gap: clamp(32px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
  }
}

/* ---------- 左侧竖排锚点 ---------- */

.page-about .rail-title {
  margin: 0 0 14px;
  color: rgba(245, 243, 247, 0.42);
  font-size: 11.5px;
  letter-spacing: 0.14em;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .rail-link {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px 9px 14px;
  text-decoration: none;
  border-left: 2px solid var(--line);
  transition: border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 25px;
  font-weight: 600;
  line-height: 0.9;
  color: rgba(58, 54, 72, 1);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.04em;
  transition: color var(--speed) var(--ease);
}

.page-about .rail-text {
  font-size: 13.5px;
  line-height: 1.4;
  color: rgba(245, 243, 247, 0.58);
  transition: color var(--speed) var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  border-left-color: var(--purple);
  background: rgba(124, 59, 255, 0.08);
}

.page-about .rail-link:hover .rail-num,
.page-about .rail-link:focus-visible .rail-num {
  color: var(--orange);
}

.page-about .rail-link:hover .rail-text,
.page-about .rail-link:focus-visible .rail-text {
  color: var(--white);
}

.page-about .rail-foot {
  margin: 22px 0 0;
  padding-left: 14px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(245, 243, 247, 0.3);
}

/* ---------- 章节骨架 ---------- */

.page-about .chapter {
  padding-block: clamp(34px, 5.5vw, 66px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 118px;
}

.page-about .chapter:first-child {
  border-top: 0;
  padding-block-start: clamp(14px, 2vw, 22px);
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: minmax(52px, auto) minmax(0, 1fr);
  gap: 4px 18px;
  align-items: start;
  margin-bottom: 20px;
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5.6vw, 58px);
  font-weight: 600;
  line-height: 0.86;
  letter-spacing: -0.06em;
  color: var(--purple);
  font-variant-numeric: tabular-nums;
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.3rem, 2.5vw, 1.95rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .chapter-copy p {
  max-width: 68ch;
  margin: 0 0 15px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(245, 243, 247, 0.82);
}

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

.page-about .chapter-note {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--orange);
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.7;
  font-weight: 600;
  color: var(--white);
}

.page-about .inline-link {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(111, 211, 255, 0.4);
  transition: border-color var(--speed) var(--ease), color var(--speed) var(--ease);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--orange-2);
  border-bottom-color: var(--orange);
}

/* ---------- 统计条 ---------- */

.page-about .stat-strip {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-about .stat-cell {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  padding: 16px 14px 15px;
  transition: border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .stat-cell:hover {
  border-color: var(--purple);
  background: #1B1828;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3.4vw, 30px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-cap {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.45;
  letter-spacing: 0.05em;
  color: rgba(245, 243, 247, 0.55);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0;
  padding-block: clamp(26px, 4vw, 44px);
}

.page-about .about-figure .media-frame {
  width: 100%;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-figure img,
.page-about .cover-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-frame-1 {
  aspect-ratio: 12 / 7;
}

.page-about .about-frame-2 {
  aspect-ratio: 4 / 3;
}

.page-about .about-frame-3 {
  aspect-ratio: 1 / 1;
}

.page-about .media-caption {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: rgba(245, 243, 247, 0.44);
}

/* ---------- 02 分工列表 ---------- */

.page-about .crew-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .crew-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 2px 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  transition: border-color var(--speed) var(--ease);
}

.page-about .crew-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .crew-item:hover {
  border-top-color: var(--purple);
}

.page-about .crew-idx {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--purple-2);
}

.page-about .crew-name {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .crew-item p {
  grid-column: 2;
  margin: 7px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 243, 247, 0.76);
}

/* ---------- 03 覆盖范围分栏 ---------- */

.page-about .cover-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .cover-copy p {
  max-width: 68ch;
  margin: 0 0 15px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(245, 243, 247, 0.82);
}

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

.page-about .cover-figure {
  margin: 0;
}

@media (min-width: 760px) {
  .page-about .cover-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    gap: 32px;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .cover-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
  }
}

/* ---------- 04 阶段列表 ---------- */

.page-about .phase-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .phase-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 18px 0 18px 16px;
  border-left: 2px solid var(--line);
  transition: border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .phase-item:hover {
  border-left-color: var(--ice);
  background: rgba(111, 211, 255, 0.05);
}

.page-about .phase-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--ice);
}

.page-about .phase-text {
  margin: 0;
  max-width: 70ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(245, 243, 247, 0.82);
}

@media (min-width: 700px) {
  .page-about .phase-item {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 6px 20px;
    align-items: start;
  }
}

/* ---------- 05 时间线 ---------- */

.page-about .about-figure-square {
  max-width: 400px;
  padding-block: 22px clamp(20px, 3vw, 32px);
}

.page-about .tl {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 22px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  inset-block: 10px;
  inset-inline-start: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--ice), rgba(111, 211, 255, 0.06));
}

.page-about .tl-item {
  position: relative;
  padding-inline-start: 34px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--ice);
  transition: border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .tl-item:hover::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .tl-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 11px;
  border-radius: 3px;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  transition: background var(--speed) var(--ease), color var(--speed) var(--ease);
}

.page-about .tl-item:hover .tl-tag {
  background: var(--orange);
  color: var(--ink-deep);
}

.page-about .tl-content {
  transition: transform var(--speed) var(--ease);
}

.page-about .tl-item:hover .tl-content {
  transform: translateX(4px);
}

.page-about .tl-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .tl-content p {
  margin: 7px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(245, 243, 247, 0.74);
}

/* ---------- 06 合作入口 ---------- */

.page-about .coop-card {
  display: block;
  margin: 26px 0 0;
  padding: clamp(20px, 3vw, 30px);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(140deg, #191623 0%, #221A33 100%);
  transition: border-color var(--speed) var(--ease), transform var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.page-about .coop-card:hover,
.page-about .coop-card:focus-visible {
  border-color: var(--purple);
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(124, 59, 255, 0.22);
}

.page-about .coop-label {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--purple-2);
}

.page-about .coop-title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .coop-text {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 243, 247, 0.76);
}

.page-about .coop-go {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--orange);
  transition: transform var(--speed) var(--ease);
}

.page-about .coop-card:hover .coop-go {
  transform: translateX(4px);
}

/* ---------- 窄屏适配 ---------- */

@media (max-width: 560px) {
  .page-about .stat-strip {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .chapter-head {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .chapter-num {
    font-size: 30px;
    letter-spacing: -0.04em;
  }

  .page-about .crew-item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 2px 12px;
  }

  .page-about .about-figure-square {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }

  .page-about .coop-card:hover,
  .page-about .coop-card:focus-visible,
  .page-about .tl-item:hover .tl-content,
  .page-about .coop-card:hover .coop-go {
    transform: none;
  }
}