/* ===== 平台介绍页 · page-about ===== */
.page-about {
  --about-rail: 236px;
  --about-accent-veil: rgba(198, 242, 78, 0.06);
  --about-lift: 6px 6px 0 rgba(0, 0, 0, 0.5);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: clamp(72px, 10vw, 140px);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .about-topline {
  padding-top: clamp(104px, 13vw, 148px);
  padding-bottom: clamp(18px, 2.6vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(38px, 5.5vw, 68px);
  border-bottom: 2px solid var(--line-2);
}

.page-about .about-hero__kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 36px;
  height: 2px;
  background: var(--lime);
  flex: none;
}

.page-about .about-hero__title {
  margin: 0 0 26px;
  max-width: 17em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(31px, 5.6vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  padding-left: 18px;
  border-left: 3px solid var(--orange);
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  margin-top: clamp(28px, 4vw, 42px);
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line);
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-metric__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .about-metric__unit {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(40px, 6vw, 64px);
  padding-top: clamp(44px, 6.5vw, 82px);
}

/* ---------- 赛季时间线 ---------- */
.page-about .about-rail__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.page-about .about-rail__sub {
  margin: 0 0 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-rail__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--mid) 100%);
  opacity: 0.55;
}

.page-about .about-node {
  position: relative;
  padding: 0 0 24px 28px;
  outline: none;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: 2px solid var(--mid);
  transition: background-color 160ms ease, border-color 160ms ease;
}

.page-about .about-node__season {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .about-node__text {
  display: block;
  font-size: 13px;
  line-height: 1.62;
  color: var(--muted);
  transition: color 160ms ease;
}

.page-about .about-node:hover::before,
.page-about .about-node:focus-visible::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-node:hover .about-node__text,
.page-about .about-node:focus-visible .about-node__text {
  color: var(--paper);
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-sec + .about-sec {
  margin-top: clamp(60px, 9vw, 116px);
  padding-top: clamp(44px, 6vw, 74px);
  border-top: 1px solid var(--line);
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: clamp(22px, 3vw, 34px);
  padding: 14px 20px;
  background: var(--indigo);
  border: 3px solid var(--line-2);
  box-shadow: var(--about-lift);
}

.page-about .about-sec__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-sec p {
  max-width: 64ch;
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-sec .note {
  max-width: 60ch;
  margin: 0 0 20px;
}

.page-about .about-more {
  margin: 22px 0 0;
  max-width: none;
}

.page-about .about-sec figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

/* ---------- 01 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

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

.page-about .about-roster-wrap {
  margin: 0 0 20px;
  overflow-x: auto;
}

.page-about .about-roster {
  width: 100%;
  min-width: 480px;
}

.page-about .about-roster th[scope="row"] {
  text-align: left;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  object-fit: cover;
}

/* ---------- 02 生产流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0 0 clamp(24px, 3.5vw, 36px);
  padding: 0;
  border-top: 2px solid var(--line-2);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 16px;
  border-bottom: 1px solid var(--line);
  border-left: 3px solid transparent;
  outline: none;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.page-about .about-step:hover,
.page-about .about-step:focus-visible {
  border-left-color: var(--lime);
  background-color: var(--about-accent-veil);
}

.page-about .about-step:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .about-step__no {
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  transition: color 160ms ease;
}

.page-about .about-step:hover .about-step__no,
.page-about .about-step:focus-visible .about-step__no {
  color: var(--lime);
}

.page-about .about-step__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -0.01em;
}

.page-about .about-step__body p {
  margin: 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-step__out {
  grid-column: 2;
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
}

.page-about .about-step__key {
  flex: none;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-step__val {
  color: var(--muted);
  transition: color 160ms ease;
}

.page-about .about-step:hover .about-step__val,
.page-about .about-step:focus-visible .about-step__val {
  color: var(--paper);
}

.page-about .about-flow__figure img,
.page-about .about-season__figure img {
  display: block;
  width: 100%;
  object-fit: cover;
}

/* ---------- 03 赛季体系 ---------- */
.page-about .about-cycle {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cycle__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-cycle__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .about-cycle__text {
  font-size: 15px;
  line-height: 1.72;
  color: var(--paper);
}

/* ---------- 04 合作生态 ---------- */
.page-about .about-partner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-bottom: 22px;
}

.page-about .about-partner__col {
  padding: 20px 22px 22px;
  background: var(--carbon);
  border: 2px solid var(--line-2);
  box-shadow: var(--about-lift);
}

.page-about .about-partner__col:first-child {
  border-top: 3px solid var(--lime);
}

.page-about .about-partner__col:last-child {
  border-top: 3px solid var(--orange);
}

.page-about .about-partner__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.page-about .about-partner__col p {
  margin: 0 0 14px;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-partner__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-partner__col li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--paper);
}

.page-about .about-partner__col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 6px;
  background: var(--mid);
}

/* ---------- 05 稿件标准 ---------- */
.page-about .about-quad {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-quad__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 0 36px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-quad__no {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
  padding-top: 2px;
}

.page-about .about-quad__title {
  margin: 0 0 5px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15.5px;
}

.page-about .about-quad__item p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cycle__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 0 24px;
    align-items: baseline;
  }

  .page-about .about-partner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 860px) {
  .page-about .about-step {
    grid-template-columns: 48px minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 0 26px;
    align-items: center;
    padding: 20px 20px;
  }

  .page-about .about-step__out {
    grid-column: auto;
    flex-direction: column;
    gap: 2px;
    text-align: left;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(48px, 5vw, 88px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }
}

@media (max-width: 999px) {
  .page-about .about-rail {
    border-top: 2px solid var(--mid);
    padding-top: 20px;
  }

  .page-about .about-rail__list {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(200px, 72%);
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 12px;
    scroll-snap-type: x proximity;
  }

  .page-about .about-rail__list::before {
    display: none;
  }

  .page-about .about-node {
    padding: 15px 16px;
    background: var(--carbon);
    border: 2px solid var(--line-2);
    scroll-snap-align: start;
  }

  .page-about .about-node::before {
    display: none;
  }
}

@media (max-width: 420px) {
  .page-about .about-sec__head {
    flex-wrap: wrap;
    gap: 6px 12px;
    padding: 12px 14px;
  }

  .page-about .about-step {
    padding: 16px 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node::before,
  .page-about .about-node__text,
  .page-about .about-step,
  .page-about .about-step__no,
  .page-about .about-step__val {
    transition: none;
  }
}