/* ===== 品牌与赛季页 · page-about ===== */

.page-about {
  display: block;
  background: var(--night-100);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--night-100);
  border-bottom: 1px solid var(--line-300);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(16, 73, 58, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(16, 73, 58, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding: 124px 0 60px;
}

.page-about .about-hero__crumb {
  grid-column: 1 / -1;
  margin-bottom: 4px;
}

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

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--turf-500);
}

.page-about .about-hero__title {
  margin: 0 0 26px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2.1rem, 6.6vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ink-900);
  max-width: 13em;
}

.page-about .about-hero__lede {
  margin: 0 0 0.9em;
  font-size: clamp(0.9375rem, 1.3vw, 1.0625rem);
  line-height: 1.85;
  color: var(--ink-600);
  max-width: 42em;
}

.page-about .about-hero__lede:last-of-type {
  margin-bottom: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1px solid var(--line-300);
}

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

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.4vw, 2.125rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--turf-500);
}

.page-about .about-stat__value--flag {
  color: var(--flag-600);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 0.75rem;
  line-height: 1.55;
  color: var(--ink-600);
}

/* 战术板视觉 */
.page-about .about-hero__visual {
  min-width: 0;
}

.page-about .pitch-board {
  position: relative;
  width: 100%;
  aspect-ratio: 5 / 4;
  background: var(--pitch-900);
  border: 1px solid var(--pitch-700);
  overflow: hidden;
}

.page-about .pitch-board svg {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .pitch-board__label {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 10px 14px;
  background: rgba(5, 23, 15, 0.86);
  border-top: 1px solid var(--pitch-700);
  font-family: var(--font-num);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--turf-300);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-main {
  background: var(--night-50);
  padding: 64px 0 88px;
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

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

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

/* 章节索引 */
.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line-300);
  display: flex;
  flex-direction: column;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0 9px 18px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--ink-600);
  text-decoration: none;
  font-size: 0.875rem;
  line-height: 1.5;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-index__link:hover {
  color: var(--ink-900);
  border-left-color: var(--turf-300);
}

.page-about .about-index__link.is-active {
  color: var(--flag-600);
  border-left-color: var(--flag-600);
  font-weight: 600;
}

.page-about .about-index__num {
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ink-600);
}

.page-about .about-index__link.is-active .about-index__num {
  color: var(--flag-600);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  margin-bottom: 72px;
  scroll-margin-top: calc(var(--nav-h, 64px) + 96px);
}

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

.page-about .about-sec__head {
  display: grid;
  gap: 12px;
  margin-bottom: 28px;
}

.page-about .about-sec__eyebrow {
  margin: 0;
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--turf-500);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.45rem, 3vw, 2.125rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink-900);
  max-width: 26em;
}

.page-about .about-sec__lead {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-600);
  max-width: 46em;
}

.page-about .about-copy p {
  margin: 0 0 1em;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-600);
  max-width: 46em;
}

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

.page-about .about-copy a,
.page-about .coop__desc a {
  color: var(--flag-700);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 50, 15, 0.35);
}

.page-about .about-copy a:hover,
.page-about .coop__desc a:hover {
  border-bottom-color: var(--flag-600);
  color: var(--flag-600);
}

/* 呼吸点：细线 + 短注释 */
.page-about .rule-note {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  margin: 36px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-300);
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: var(--ink-600);
}

.page-about .rule-note__key {
  color: var(--flag-600);
  letter-spacing: 0.1em;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 32px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-300);
  background: var(--pitch-900);
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 14 / 9;
}

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

.page-about .about-figure__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: var(--ink-600);
}

/* ---------- 三阶段刻度尺 ---------- */
.page-about .stage-scale {
  margin-top: 8px;
  border-top: 1px solid var(--line-300);
}

.page-about .stage {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding: 26px 0 26px 44px;
  border-bottom: 1px solid var(--line-300);
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 30px;
  bottom: 30px;
  width: 1px;
  background: var(--line-300);
}

.page-about .stage::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 42px;
  width: 11px;
  height: 1px;
  background: var(--flag-600);
}

.page-about .stage__meta {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .stage__num {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--flag-600);
}

.page-about .stage__range {
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--ink-600);
}

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

.page-about .stage__name {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.1875rem;
  line-height: 1.3;
  color: var(--ink-900);
}

.page-about .stage__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-600);
  max-width: 44em;
}

/* ---------- 团队表格 ---------- */
.page-about .team-table {
  border-top: 1px solid var(--line-300);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 8px 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-300);
}

.page-about .team-row__num {
  grid-column: 1;
  grid-row: 1;
  align-self: start;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 1.375rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--turf-500);
}

.page-about .team-row__name {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.0625rem;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .team-row__desc {
  grid-column: 1 / -1;
  grid-row: 2;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-600);
}

/* ---------- 流程折叠 ---------- */
.page-about .flow {
  border-top: 1px solid var(--line-300);
}

.page-about .flow__step {
  border-bottom: 1px solid var(--line-300);
}

.page-about .flow__summary {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 14px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--ink-900);
}

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

.page-about .flow__summary:hover .flow__name {
  color: var(--flag-600);
}

.page-about .flow__name {
  transition: color 0.2s ease;
}

.page-about .flow__idx {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--flag-600);
}

.page-about .flow__sign {
  position: relative;
  justify-self: end;
  width: 14px;
  height: 14px;
}

.page-about .flow__sign::before,
.page-about .flow__sign::after {
  content: "";
  position: absolute;
  background: var(--ink-600);
}

.page-about .flow__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1px;
}

.page-about .flow__sign::after {
  left: 6px;
  top: 0;
  width: 1px;
  height: 14px;
  transition: transform 0.22s ease;
}

.page-about .flow__step[open] .flow__sign::after {
  transform: scaleY(0);
}

.page-about .flow__body {
  margin: 0;
  padding: 0 0 24px;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-600);
  max-width: 46em;
}

/* ---------- 赛季迭代切换 ---------- */
.page-about .season-switch {
  position: relative;
}

.page-about .season-switch__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  opacity: 0;
  pointer-events: none;
}

.page-about .season-switch__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
}

.page-about .season-switch__tab {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--line-300);
  font-family: var(--font-num);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--ink-600);
  cursor: pointer;
  user-select: none;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .season-switch__tab:hover {
  border-color: var(--turf-500);
  color: var(--ink-900);
}

.page-about .season-switch__panels {
  min-height: 168px;
}

.page-about .season-switch__panel {
  display: none;
}

.page-about #about-season-1:checked ~ .season-switch__tabs label[for="about-season-1"],
.page-about #about-season-2:checked ~ .season-switch__tabs label[for="about-season-2"],
.page-about #about-season-3:checked ~ .season-switch__tabs label[for="about-season-3"],
.page-about #about-season-4:checked ~ .season-switch__tabs label[for="about-season-4"] {
  background: var(--flag-600);
  border-color: var(--flag-600);
  color: var(--night-50);
}

.page-about #about-season-1:checked ~ .season-switch__panels > .season-switch__panel:nth-child(1),
.page-about #about-season-2:checked ~ .season-switch__panels > .season-switch__panel:nth-child(2),
.page-about #about-season-3:checked ~ .season-switch__panels > .season-switch__panel:nth-child(3),
.page-about #about-season-4:checked ~ .season-switch__panels > .season-switch__panel:nth-child(4) {
  display: block;
}

.page-about .mile {
  border-left: 2px solid var(--turf-500);
  padding-left: 22px;
}

.page-about .mile__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--turf-500);
}

.page-about .mile__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.3;
  color: var(--ink-900);
}

.page-about .mile__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-600);
  max-width: 44em;
}

/* ---------- 协作方向 ---------- */
.page-about .coop-list {
  border-top: 1px solid var(--line-300);
}

.page-about .coop {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-300);
}

.page-about .coop__who {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .coop__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-600);
  max-width: 46em;
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  margin-top: 48px;
  padding: 36px 24px;
  background: var(--pitch-900);
  border-left: 3px solid var(--flag-600);
  display: grid;
  gap: 14px;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.25rem, 2.4vw, 1.625rem);
  line-height: 1.3;
  color: var(--night-50);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(247, 243, 232, 0.78);
  max-width: 44em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

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

.page-about .about-cta__ghost {
  color: var(--night-100);
  border-color: rgba(247, 243, 232, 0.4);
}

.page-about .about-cta__ghost:hover {
  border-color: var(--turf-300);
  color: var(--turf-300);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .stage {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
    padding: 32px 0 32px 56px;
  }

  .page-about .stage::before {
    left: 19px;
    top: 36px;
    bottom: 36px;
  }

  .page-about .stage::after {
    left: 14px;
    top: 50px;
  }

  .page-about .stage__meta {
    display: block;
  }

  .page-about .stage__range {
    display: block;
    margin-top: 8px;
  }

  .page-about .flow__summary {
    grid-template-columns: 48px minmax(0, 1fr) 20px;
    padding: 22px 0;
  }

  .page-about .flow__body {
    padding-left: 62px;
  }

  .page-about .coop {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
    padding: 28px 0;
  }

  .page-about .about-cta {
    padding: 44px 40px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: 64px;
    align-items: center;
    padding: 164px 0 84px;
  }

  .page-about .about-hero__visual {
    align-self: center;
  }
}

@media (min-width: 1080px) {
  .page-about .about-main {
    padding: 100px 0 128px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--rail, 240px) minmax(0, 1fr);
    gap: 80px;
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--nav-h, 64px) + 92px);
    align-self: start;
  }

  .page-about .about-sec {
    margin-bottom: 112px;
  }

  .page-about .team-row {
    grid-template-columns: 72px 210px minmax(0, 1fr);
    gap: 32px;
    align-items: baseline;
    padding: 26px 0;
  }

  .page-about .team-row__num {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .team-row__name {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .team-row__desc {
    grid-column: 3;
    grid-row: 1;
  }
}

@media (min-width: 1320px) {
  .page-about .about-layout {
    gap: 104px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .flow__sign::after,
  .page-about .season-switch__tab,
  .page-about .flow__name {
    transition: none;
  }
}
<<<END>>>