.page-about {
  --ab-index-width: 210px;
  --ab-line: var(--line);
  --ab-line-soft: var(--line-soft);
  --ab-line-strong: var(--line-strong);
  --ab-num: var(--font-data);
  --ab-display: var(--font-display);
  --ab-editorial: var(--font-editorial);
  display: block;
  color: var(--text);
  background:
    radial-gradient(120% 55% at 50% 0%, rgba(58, 42, 90, 0.32), transparent 62%),
    var(--bg);
  font-family: var(--font-body);
}

.page-about .about-frame {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(14px, 2.6vw, 24px) var(--pad) clamp(56px, 8vw, 104px);
}

.page-about .breadcrumbs {
  margin-bottom: clamp(14px, 2.4vw, 22px);
}

/* ---------- 框景首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 0;
  padding: clamp(30px, 6vw, 76px) clamp(18px, 5vw, 68px) clamp(32px, 5vw, 68px);
  border: 1px solid var(--ab-line);
  background:
    linear-gradient(180deg, rgba(14, 59, 46, 0.55), rgba(6, 40, 31, 0.12)),
    var(--bg);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid var(--ab-line-soft);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: repeating-linear-gradient(90deg, var(--c-gold) 0 1px, transparent 1px 26px);
  opacity: 0.7;
}

.page-about .about-hero .eyebrow {
  color: var(--c-gold);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 17ch;
  font-family: var(--ab-display);
  font-weight: 700;
  font-size: var(--fs-64);
  line-height: 1.02;
  letter-spacing: 0.05em;
  color: var(--c-ivory);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 60ch;
  font-family: var(--ab-editorial);
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--text-mid);
}

.page-about .about-kpi {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4.4vw, 48px);
  border: 1px solid var(--ab-line);
  background: var(--ab-line);
}

.page-about .about-kpi__cell {
  display: grid;
  gap: 5px;
  align-content: start;
  padding: 16px 15px 18px;
  background: var(--bg);
}

.page-about .about-kpi__label {
  font-family: var(--ab-num);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.page-about .about-kpi__num {
  font-family: var(--ab-num);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-lime);
}

.page-about .about-kpi__sub {
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 主体：索引 + 章节 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  margin-top: clamp(36px, 6vw, 72px);
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-family: var(--ab-num);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--c-gold);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list::-webkit-scrollbar {
  height: 3px;
}

.page-about .about-index__list::-webkit-scrollbar-thumb {
  background: var(--c-gold);
}

.page-about .about-index__list a {
  display: block;
  padding: 7px 13px;
  border: 1px solid var(--ab-line);
  font-family: var(--ab-num);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-aqua);
  border-color: var(--c-aqua);
}

.page-about .about-index__list a[aria-current="true"] {
  color: var(--c-lime);
  border-color: var(--c-lime);
  background: rgba(182, 255, 59, 0.07);
}

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

.page-about .about-section {
  padding-block: clamp(38px, 6vw, 78px);
  border-top: 1px solid var(--ab-line-soft);
  scroll-margin-top: 104px;
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .about-section__no {
  font-family: var(--ab-num);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--c-gold);
  padding-top: 6px;
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--ab-display);
  font-weight: 700;
  font-size: var(--fs-40);
  line-height: 1.08;
  letter-spacing: 0.04em;
  color: var(--c-ivory);
}

.page-about .about-section__lede {
  margin: 0 0 clamp(18px, 3vw, 30px);
  max-width: 62ch;
  font-family: var(--ab-editorial);
  font-size: var(--fs-16);
  line-height: 1.9;
  color: var(--text-mid);
}

.page-about .about-grid__text p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--text-mid);
}

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

.page-about .about-grid__text a {
  color: var(--c-aqua);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-grid__text a:hover {
  color: var(--c-lime);
}

.page-about .about-grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-grid__media {
  margin: 0;
}

/* ---------- 章节索引标签 ---------- */
.page-about .about-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 22px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--ab-line-soft);
  list-style: none;
}

.page-about .about-notes li {
  position: relative;
  padding-left: 15px;
  font-family: var(--ab-num);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.page-about .about-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 1px;
  background: var(--c-gold);
}

/* ---------- 校订步骤 ---------- */
.page-about .method-steps {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  border: 1px solid var(--ab-line);
  background: var(--ab-line);
  list-style: none;
}

.page-about .method-step {
  display: grid;
  gap: 8px;
  padding: 20px 18px 22px;
  background: var(--panel-deep);
  transition: background var(--dur) var(--ease);
}

.page-about .method-step:hover {
  background: var(--c-pitch);
}

.page-about .method-step__no {
  font-family: var(--ab-num);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--c-aqua);
}

.page-about .method-step__title {
  margin: 0;
  font-family: var(--ab-display);
  font-weight: 700;
  font-size: var(--fs-20);
  letter-spacing: 0.06em;
  color: var(--c-ivory);
}

.page-about .method-step p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 团队 ---------- */
.page-about .squad-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 赛季时间线 ---------- */
.page-about .season-track {
  position: relative;
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--ab-line-strong);
  list-style: none;
}

.page-about .season-card {
  position: relative;
  display: grid;
  gap: 7px;
  padding: 20px 20px 22px;
  border: 1px solid var(--ab-line-soft);
  background: var(--panel-deep);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .season-card::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 26px;
  width: 9px;
  height: 9px;
  background: var(--c-gold);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .season-card:hover {
  border-color: var(--c-lime);
  background: var(--c-pitch);
}

.page-about .season-card:hover::before {
  background: var(--c-lime);
  transform: scale(1.25);
}

.page-about .season-card__year {
  font-family: var(--ab-num);
  font-weight: 700;
  font-size: var(--fs-20);
  letter-spacing: 0.08em;
  color: var(--c-lime);
}

.page-about .season-card__title {
  margin: 0;
  font-family: var(--ab-display);
  font-weight: 700;
  font-size: var(--fs-20);
  letter-spacing: 0.05em;
  color: var(--c-ivory);
}

.page-about .season-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .season-card--now {
  border-color: rgba(255, 107, 44, 0.5);
}

.page-about .season-card--now::before {
  background: var(--c-orange);
}

.page-about .season-card--now .season-card__year {
  color: var(--c-orange);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-facts {
  display: grid;
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  border: 1px solid var(--ab-line);
  background: var(--ab-line);
  list-style: none;
}

.page-about .eco-facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 16px;
  background: var(--bg);
}

.page-about .eco-facts__num {
  font-family: var(--ab-num);
  font-weight: 700;
  font-size: var(--fs-28);
  line-height: 1;
  color: var(--c-gold);
  min-width: 2.4em;
}

.page-about .eco-facts__label {
  font-size: var(--fs-14);
  line-height: 1.6;
  color: var(--text-mid);
}

/* ---------- 开始合作 ---------- */
.page-about .about-paths {
  display: grid;
  gap: 1px;
  border: 1px solid var(--ab-line);
  background: var(--ab-line);
}

.page-about .about-path {
  display: grid;
  gap: 7px;
  padding: 20px 18px 22px;
  background: var(--bg);
  color: inherit;
  text-decoration: none;
  transition: background var(--dur) var(--ease);
}

.page-about .about-path:hover,
.page-about .about-path:focus-visible {
  background: var(--c-pitch);
}

.page-about .about-path__no {
  font-family: var(--ab-num);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--c-aqua);
}

.page-about .about-path__title {
  font-family: var(--ab-display);
  font-weight: 700;
  font-size: var(--fs-20);
  letter-spacing: 0.06em;
  color: var(--c-ivory);
}

.page-about .about-path__desc {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-contact-card {
  margin-top: clamp(24px, 4vw, 40px);
  padding: 22px 20px 24px;
  border: 1px solid var(--ab-line);
  border-left: 2px solid var(--c-lime);
  background: var(--panel-deep);
}

.page-about .about-contact-card__title {
  margin: 0 0 16px;
  font-family: var(--ab-display);
  font-weight: 700;
  font-size: var(--fs-20);
  letter-spacing: 0.06em;
  color: var(--c-ivory);
}

.page-about .about-contact-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-contact-list li {
  display: grid;
  gap: 3px;
  padding-bottom: 11px;
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .about-contact-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-contact-list .contact-list__label {
  font-family: var(--ab-num);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--text-dim);
}

.page-about .about-contact-list .contact-list__value {
  font-family: var(--ab-num);
  font-size: var(--fs-14);
  letter-spacing: 0.02em;
  color: var(--c-ivory);
  word-break: break-word;
}

.page-about .about-contact-card__note {
  margin: 18px 0 0;
  font-size: var(--fs-12);
  line-height: 1.75;
  color: var(--text-dim);
}

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

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

  .page-about .method-step--wide {
    grid-column: 1 / -1;
  }

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

  .page-about .eco-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .eco-facts li {
    flex-direction: column;
    gap: 6px;
  }
}

@media (min-width: 900px) {
  .page-about .about-grid--story,
  .page-about .about-grid--team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-grid--team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-grid--eco {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: center;
  }

  .page-about .about-grid--eco .about-grid__media {
    order: 2;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--ab-index-width) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-index__list {
    display: grid;
    gap: 2px;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--ab-line-soft);
  }

  .page-about .about-index__list a {
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 0 9px 14px;
    margin-left: -1px;
    background: transparent;
    white-space: normal;
  }

  .page-about .about-index__list a[aria-current="true"] {
    border-left-color: var(--c-lime);
    background: transparent;
    color: var(--c-lime);
  }
}

@media (min-width: 1180px) {
  .page-about .about-section__head {
    gap: 20px;
  }

  .page-about .about-contact-card {
    padding: 26px 28px 28px;
  }

  .page-about .about-contact-card__title {
    margin-bottom: 20px;
  }

  .page-about .about-contact-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season-card,
  .page-about .method-step,
  .page-about .about-path {
    transition: none;
  }
}