.page-about {
  background: var(--cream);
  color: var(--ink);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  padding: 18px 0 44px;
}

.page-about .breadcrumb {
  font-size: var(--fs-12);
  color: var(--muted);
  margin-bottom: 26px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--red);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-hero__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-weight: 200;
  font-size: var(--fs-64);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: var(--line);
}

.page-about .about-hero__since {
  font-size: var(--fs-12);
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-about .about-hero h1 {
  font-size: var(--fs-40);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 12px 0 18px;
  max-width: 16em;
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--muted);
  max-width: 36em;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 30px;
  list-style: none;
  margin: 28px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-hero__facts .mono {
  display: block;
  font-size: var(--fs-28);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--green);
  margin-bottom: 4px;
}

/* ===== 章节通用 ===== */
.page-about .about-sec {
  padding: 46px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-sec__head {
  margin-bottom: 22px;
}

.page-about .about-sec__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 200;
  font-size: var(--fs-40);
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: var(--line);
  margin-bottom: 12px;
}

.page-about .about-sec__title {
  margin: 0;
  font-size: var(--fs-28);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.01em;
  max-width: 20em;
}

.page-about .about-sec__lede {
  margin: 0 0 26px;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--muted);
  max-width: 40em;
}

/* ===== 01 品牌起点 ===== */
.page-about .origin-body {
  display: grid;
  gap: 26px;
}

.page-about .origin-text p {
  margin: 0 0 18px;
  font-size: var(--fs-16);
  line-height: 1.9;
}

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

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

.page-about .origin-figure__frame {
  position: relative;
  background: var(--green);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), calc(100% - 36px) 100%, 0 100%);
}

.page-about .origin-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .origin-figure__cap {
  margin: 12px 0 0;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--muted);
}

/* ===== 02 内容生产 ===== */
.page-about .team-grid {
  display: grid;
  gap: 24px;
}

.page-about .team-matrix {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-cell {
  background: var(--white);
  padding: 20px 18px;
  transition: background 180ms var(--ease);
}

.page-about .team-cell:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .team-cell:hover,
.page-about .team-cell:focus-visible {
  background: var(--green);
}

.page-about .team-cell__num {
  display: block;
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--red);
  margin-bottom: 12px;
  transition: color 180ms var(--ease);
}

.page-about .team-cell__name {
  margin: 0 0 8px;
  font-size: var(--fs-20);
  font-weight: 900;
  line-height: 1.3;
  transition: color 180ms var(--ease);
}

.page-about .team-cell__note {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--muted);
  transition: color 180ms var(--ease);
}

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

.page-about .team-cell:hover .team-cell__name,
.page-about .team-cell:focus-visible .team-cell__name {
  color: var(--white);
}

.page-about .team-cell:hover .team-cell__note,
.page-about .team-cell:focus-visible .team-cell__note {
  color: var(--teal);
}

.page-about .team-figure {
  margin: 0;
  padding: 10px;
  background: var(--white);
  border: 1px solid var(--line);
}

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

.page-about .team-figure figcaption {
  padding: 10px 4px 2px;
  font-size: var(--fs-12);
  line-height: 1.65;
  color: var(--muted);
}

.page-about .team-footnote {
  margin: 26px 0 0;
  padding: 18px 20px;
  background: var(--cream-deep);
  border-left: 3px solid var(--lime);
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--green);
}

/* ===== 03 赛季时间线 ===== */
.page-about .season-track {
  position: relative;
  padding-left: 26px;
  margin-top: 6px;
}

.page-about .season-track::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--line);
}

.page-about .season-node {
  position: relative;
  border-bottom: 1px solid var(--line);
}

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

.page-about .season-node summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 18px 34px 18px 0;
}

.page-about .season-node summary::-webkit-details-marker {
  display: none;
}

.page-about .season-node summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .season-node summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  color: var(--muted);
  transition: color 180ms var(--ease);
}

.page-about .season-node[open] summary::after {
  content: "−";
  color: var(--red);
}

.page-about .season-node__dot {
  position: absolute;
  left: -20px;
  top: 22px;
  width: 13px;
  height: 13px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--red);
  transition: background 180ms var(--ease);
}

.page-about .season-node[open] .season-node__dot {
  background: var(--red);
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .season-node__phase {
  flex: 0 0 100%;
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .season-node__name {
  position: relative;
  font-size: var(--fs-20);
  font-weight: 900;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .season-node__name::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 100%;
  height: 3px;
  background: var(--lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms var(--ease);
}

.page-about .season-node[open] .season-node__name::after {
  transform: scaleX(1);
}

.page-about .season-node__body {
  padding: 4px 0 20px;
}

.page-about .season-node__body p {
  margin: 0 0 10px;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--muted);
  max-width: 46em;
}

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

.page-about .season-texture {
  margin: 26px 0 0;
  height: 90px;
  overflow: hidden;
  background: var(--green);
}

.page-about .season-texture img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.82;
}

/* ===== 04 合作生态 ===== */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 118px;
  padding: 20px 16px;
  background: var(--white);
}

.page-about .partner-cell__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--fs-28);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--green);
}

.page-about .partner-cell__label {
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--muted);
}

.page-about .partner-cell--accent {
  background: var(--green);
}

.page-about .partner-cell--accent .partner-cell__num {
  color: var(--lime);
}

.page-about .partner-cell--accent .partner-cell__label {
  color: var(--white);
}

.page-about .partner-note {
  margin: 22px 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--muted);
  max-width: 46em;
}

.page-about .partner-note a {
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .partner-note a:hover {
  color: var(--red-deep);
}

/* ===== 05 内容标准 ===== */
.page-about .std-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .std-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  column-gap: 12px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .std-item__num {
  grid-column: 1;
  grid-row: 1;
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--red);
}

.page-about .std-item__name {
  grid-column: 2;
  grid-row: 1;
  margin: 0 0 6px;
  font-size: var(--fs-20);
  font-weight: 900;
  line-height: 1.4;
}

.page-about .std-item__text {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--muted);
  max-width: 44em;
}

/* ===== 收束区 ===== */
.page-about .about-cta {
  padding: 48px 0 60px;
  background: var(--green);
  color: var(--white);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 20px;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: var(--fs-28);
  font-weight: 900;
  line-height: 1.28;
  color: var(--white);
}

.page-about .about-cta p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.9;
  color: var(--teal);
  max-width: 46em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ===== 平板 ===== */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 26px 0 56px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-hero__year {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 8px;
  }

  .page-about .about-hero__facts {
    gap: 20px 40px;
  }

  .page-about .about-sec {
    padding: 62px 0;
  }

  .page-about .about-sec__num {
    font-size: var(--fs-64);
  }

  .page-about .origin-body {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.9fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .partner-cell__num {
    font-size: var(--fs-40);
  }

  .page-about .season-texture {
    height: 150px;
    margin-top: 34px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }

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

/* ===== 桌面 ===== */
@media (min-width: 1100px) {
  .page-about .about-hero__grid {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .about-hero__num {
    font-size: var(--fs-96);
  }

  .page-about .about-hero h1 {
    font-size: var(--fs-64);
    max-width: 13em;
  }

  .page-about .about-hero__lede {
    font-size: var(--fs-20);
    line-height: 1.8;
  }

  .page-about .about-sec__num {
    font-size: var(--fs-86, 96px);
  }

  .page-about .about-sec__title {
    font-size: var(--fs-40);
  }

  .page-about .about-sec__lede {
    font-size: var(--fs-16);
  }

  .page-about .origin-text p {
    font-size: var(--fs-16);
  }

  .page-about .season-node__name {
    font-size: var(--fs-28);
  }

  .page-about .std-item__name {
    font-size: var(--fs-28);
  }

  .page-about .about-cta h2 {
    font-size: var(--fs-40);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-cell,
  .page-about .team-cell__num,
  .page-about .team-cell__name,
  .page-about .team-cell__note,
  .page-about .season-node__dot,
  .page-about .season-node__name::after,
  .page-about .season-node summary::after {
    transition: none;
  }
}

.page-about {
  --fs-86: 1rem;
}