.page-about {
  --about-rail: 44px;
  --about-dot: 12px;
  position: relative;
  font-family: var(--font-body);
  color: var(--mist-100);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(70% 34% at 100% 0%, rgba(201, 255, 61, 0.055), transparent 72%),
    radial-gradient(52% 30% at 0% 38%, rgba(46, 230, 200, 0.035), transparent 70%);
  padding-bottom: 56px;
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- 面包屑留白 ---------- */
.page-about .about-crumb {
  padding: 22px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 40px;
  border-bottom: var(--line);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 4px;
  color: var(--lime-400);
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 1.05rem + 2.6vw, 2.9rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--mist-100);
}

.page-about .about-hero .lede {
  max-width: 62ch;
  color: var(--moss-300);
  font-size: var(--fs-16);
  line-height: 1.8;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 1px;
  background: var(--ink-600);
  border: var(--line);
}

.page-about .about-stat {
  background: var(--ink-800);
  padding: 14px 16px 16px;
}

.page-about .about-stat dt {
  margin: 0 0 6px;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--moss-300);
}

.page-about .about-stat dd {
  margin: 0;
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--mist-100);
}

/* ---------- 纵向刻度线 ---------- */
.page-about .about-track {
  position: relative;
  padding: 10px 0 18px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: calc(var(--about-dot) / 2 - 0.5px);
  top: 30px;
  bottom: 34px;
  width: 1px;
  background: linear-gradient(180deg, var(--ink-700) 0%, var(--ink-600) 55%, transparent 100%);
  pointer-events: none;
}

.page-about .about-chapter {
  --ch-accent: var(--lime-400);
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  column-gap: clamp(14px, 2.6vw, 32px);
  padding: 30px 0;
}

.page-about .about-chapter--amber {
  --ch-accent: var(--amber-500);
}

.page-about .about-chapter--silver {
  --ch-accent: var(--silver-400);
}

.page-about .about-chapter--last {
  padding-bottom: 8px;
}

.page-about .about-chapter__rail {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding-top: 5px;
}

.page-about .about-chapter__dot {
  flex: none;
  width: var(--about-dot);
  height: var(--about-dot);
  border-radius: 50%;
  background: var(--ink-700);
  box-shadow: 0 0 0 4px var(--ink-900);
  transition: background-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.page-about .about-chapter:hover .about-chapter__dot,
.page-about .about-chapter:focus-within .about-chapter__dot {
  background: var(--ch-accent);
  box-shadow: 0 0 0 4px var(--ink-900), 0 0 16px rgba(255, 255, 255, 0.22);
}

.page-about .about-chapter__no {
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--moss-300);
  transition: color 0.3s var(--ease);
}

.page-about .about-chapter:hover .about-chapter__no,
.page-about .about-chapter:focus-within .about-chapter__no {
  color: var(--ch-accent);
}

.page-about .about-chapter__body {
  min-width: 0;
  max-width: 68ch;
}

/* ---------- 标题与正文 ---------- */
.page-about .about-h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.25rem, 0.98rem + 1.4vw, 1.8rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--mist-100);
}

.page-about .about-h3 {
  margin: 0 0 6px;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.5;
  color: var(--mist-100);
}

.page-about .about-p {
  margin: 0 0 16px;
  color: var(--moss-300);
  font-size: var(--fs-16);
  line-height: 1.78;
}

.page-about .about-p--tight {
  margin-top: 20px;
}

/* ---------- 整理链路 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 0 20px;
  border-bottom: var(--line);
}

.page-about .about-step__time {
  display: inline-flex;
  align-self: start;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--lime-400);
}

.page-about .about-step__text p {
  margin: 0;
  color: var(--moss-300);
  font-size: var(--fs-14);
  line-height: 1.75;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
  border: var(--line);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .about-figure--narrow img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure figcaption {
  padding: 11px 16px 13px;
  border-top: var(--line);
  font-size: var(--fs-12);
  letter-spacing: 0.02em;
  color: var(--moss-300);
}

/* ---------- 四个小组 ---------- */
.page-about .about-roster {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .about-role {
  --ch-accent: var(--lime-400);
  padding: 18px 0 20px;
  border-bottom: var(--line);
  outline: none;
  transition: background-color 0.3s var(--ease);
}

.page-about .about-role:nth-child(1) {
  --ch-accent: var(--lime-400);
}

.page-about .about-role:nth-child(2) {
  --ch-accent: var(--teal-400);
}

.page-about .about-role:nth-child(3) {
  --ch-accent: var(--amber-500);
}

.page-about .about-role:nth-child(4) {
  --ch-accent: var(--silver-400);
}

.page-about .about-role:focus-visible {
  box-shadow: 0 0 0 2px var(--lime-400);
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.page-about .about-role__name {
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--mist-100);
}

.page-about .about-role__count {
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ch-accent);
  transition: transform 0.3s var(--ease);
}

.page-about .about-role__count::after {
  content: " 人";
  font-family: var(--font-body);
  font-size: var(--fs-12);
  font-weight: 400;
  letter-spacing: 0;
  color: var(--moss-300);
}

.page-about .about-role:hover .about-role__count {
  transform: translateX(-3px);
}

.page-about .about-role__bar {
  position: relative;
  height: 6px;
  margin: 12px 0 14px;
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .about-role__bar span {
  display: block;
  height: 100%;
  background: var(--ch-accent);
  transition: width 0.5s var(--ease);
}

.page-about .about-role:nth-child(1) .about-role__bar span {
  width: 39.3%;
}

.page-about .about-role:nth-child(2) .about-role__bar span {
  width: 25%;
}

.page-about .about-role:nth-child(3) .about-role__bar span {
  width: 21.4%;
}

.page-about .about-role:nth-child(4) .about-role__bar span {
  width: 14.3%;
}

.page-about .about-role__desc {
  margin: 0;
  max-width: 62ch;
  color: var(--moss-300);
  font-size: var(--fs-14);
  line-height: 1.75;
}

/* ---------- 赛季节奏 ---------- */
.page-about .about-phases {
  display: grid;
  gap: 0;
  margin: 26px 0 0;
  border-top: var(--line);
}

.page-about .about-phase {
  position: relative;
  padding: 20px 0 22px;
  border-bottom: var(--line);
}

.page-about .about-phase .tag {
  margin-bottom: 10px;
}

.page-about .about-phase p {
  margin: 0;
  color: var(--moss-300);
  font-size: var(--fs-14);
  line-height: 1.75;
}

/* ---------- 版本节点 ---------- */
.page-about .about-versions {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .about-version {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 18px 0 20px;
  border-bottom: var(--line);
}

.page-about .about-version__tag {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  padding: 4px 10px 5px;
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--ink-900);
  background: var(--silver-400);
}

.page-about .about-version:nth-child(2) .about-version__tag {
  background: var(--ink-700);
  border: 1px solid var(--ink-600);
  color: var(--mist-100);
}

.page-about .about-version:nth-child(3) .about-version__tag {
  background: var(--lime-400);
  color: var(--ink-900);
}

.page-about .about-version__text p {
  margin: 0;
  color: var(--moss-300);
  font-size: var(--fs-14);
  line-height: 1.75;
}

/* ---------- 协作伙伴 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  padding: 1px;
  background: var(--ink-600);
  border: var(--line);
}

.page-about .about-partner {
  background: var(--ink-800);
  padding: 20px 20px 22px;
}

.page-about .about-partner__num {
  display: block;
  margin-bottom: 8px;
  font-size: var(--fs-40);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--teal-400);
}

.page-about .about-partner p {
  margin: 0;
  color: var(--moss-300);
  font-size: var(--fs-14);
  line-height: 1.75;
}

/* ---------- 联系 ---------- */
.page-about .about-contact {
  display: grid;
  gap: 1px;
  margin: 22px 0 0;
  padding: 1px;
  background: var(--ink-600);
  border: var(--line);
}

.page-about .about-contact__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--ink-800);
  padding: 16px 20px 18px;
}

.page-about .about-contact__label {
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--moss-300);
}

.page-about .about-contact__value {
  font-size: var(--fs-16);
  color: var(--mist-100);
  word-break: break-all;
}

.page-about .about-more {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

/* ---------- 右缘迷你目录 ---------- */
.page-about .about-toc {
  display: none;
}

@media (min-width: 1560px) {
  .page-about .about-toc {
    display: block;
    position: fixed;
    top: 50%;
    right: calc((100vw - var(--page-max)) / 2 - 92px);
    transform: translateY(-50%);
    z-index: 4;
  }

  .page-about .about-toc ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .page-about .about-toc a {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-size: var(--fs-12);
    letter-spacing: 0.04em;
    line-height: 1.4;
    color: var(--moss-300);
    transition: color 0.25s var(--ease);
  }

  .page-about .about-toc a::before {
    content: "";
    flex: none;
    width: 16px;
    height: 1px;
    background: var(--ink-600);
    transition: width 0.25s var(--ease), background-color 0.25s var(--ease);
  }

  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible {
    color: var(--lime-400);
  }

  .page-about .about-toc a:hover::before,
  .page-about .about-toc a:focus-visible::before {
    width: 26px;
    background: var(--lime-400);
  }
}

/* ---------- 中等宽度 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding-top: 30px;
  }

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

  .page-about .about-step {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .about-step__time {
    padding-top: 3px;
  }

  .page-about .about-versions .about-version {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .about-version__tag {
    padding-top: 5px;
  }

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

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

  .page-about .about-figure--narrow {
    max-width: 640px;
    margin-left: auto;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about {
    --about-rail: 72px;
    --about-dot: 13px;
  }

  .page-about .about-hero {
    padding-bottom: 52px;
  }

  .page-about .about-chapter {
    padding: 40px 0;
  }

  .page-about .about-phases {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    padding: 1px;
    background: var(--ink-600);
    border: var(--line);
  }

  .page-about .about-phase {
    border-bottom: none;
    padding: 24px 22px 30px;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  }

  .page-about .about-phase--a {
    background: linear-gradient(158deg, rgba(46, 230, 200, 0.11), var(--ink-800) 60%);
  }

  .page-about .about-phase--b {
    background: linear-gradient(158deg, rgba(255, 138, 43, 0.13), var(--ink-800) 60%);
  }

  .page-about .about-phase--c {
    background: linear-gradient(158deg, rgba(201, 255, 61, 0.13), var(--ink-800) 60%);
  }
}

/* ---------- 指针设备：小组简介悬停展开 ---------- */
@media (min-width: 900px) and (hover: hover) and (pointer: fine) {
  .page-about .about-role__desc {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease), opacity 0.3s var(--ease);
  }

  .page-about .about-role:hover .about-role__desc,
  .page-about .about-role:focus-within .about-role__desc,
  .page-about .about-role:focus-visible .about-role__desc {
    max-height: 200px;
    opacity: 1;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .about-role__desc {
    max-height: none !important;
    opacity: 1 !important;
  }
}