.page-about {
  --about-rail: 172px;
  background: var(--light);
  color: var(--ink);
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(255, 107, 26, .16) 0%, rgba(255, 107, 26, 0) 55%),
    linear-gradient(168deg, var(--ink) 0%, var(--ink-deep) 100%);
  color: var(--light);
  padding: 24px 0 40px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(76, 107, 82, .18) 0 1px, transparent 1px 64px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 31px;
  line-height: 1.12;
  letter-spacing: .005em;
  color: var(--light);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  color: rgba(244, 247, 243, .82);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  border: 1px solid var(--hair-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--hair-light);
}

.page-about .hero-fact {
  background: rgba(8, 28, 23, .62);
  padding: 14px 16px 16px;
}

.page-about .hero-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--signal);
}

.page-about .hero-fact__key {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(244, 247, 243, .64);
}

.page-about .about-hero__index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-about .about-hero__index a {
  display: inline-block;
  padding: 7px 13px;
  border: 1px solid var(--hair-light);
  border-radius: 999px;
  color: var(--light);
  font-size: 13px;
  letter-spacing: .04em;
  text-decoration: none;
  transition: border-color .18s ease, background-color .18s ease;
}

.page-about .about-hero__index a:hover,
.page-about .about-hero__index a:focus-visible {
  border-color: var(--signal);
  background: rgba(255, 107, 26, .14);
}

/* ---------- 通用节奏 ---------- */
.page-about .section {
  padding: 46px 0;
}

/* ---------- 团队与分工 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .about-team__title {
  margin: 10px 0 14px;
  font-size: 24px;
  line-height: 1.34;
  color: var(--ink);
}

.page-about .about-team__text .prose {
  color: var(--field-ink);
}

.page-about .about-team__text .prose + .prose {
  margin-top: 14px;
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 16px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--hair-dark);
}

.page-about .team-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--ink);
}

.page-about .team-stat__key {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--field-ink);
}

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

.page-about .about-team__media figcaption {
  display: block;
  margin-top: 10px;
}

/* ---------- 三道校验 ---------- */
.page-about .verify__panel {
  position: relative;
  background: linear-gradient(150deg, var(--ink) 0%, var(--ink-deep) 100%);
  color: var(--light);
  border-radius: var(--radius);
  padding: 28px 20px 30px;
  box-shadow: var(--paper-shadow);
  overflow: hidden;
}

.page-about .verify__panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 88px;
  height: 4px;
  background: var(--signal);
}

.page-about .verify__title {
  margin: 12px 0 12px;
  font-size: 24px;
  line-height: 1.34;
  color: var(--light);
}

.page-about .verify__lede {
  margin: 0 0 26px;
  color: rgba(244, 247, 243, .78);
}

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

.page-about .verify__step {
  position: relative;
  padding: 0 0 22px 46px;
}

.page-about .verify__step:last-child {
  padding-bottom: 0;
}

.page-about .verify__step::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 34px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, rgba(255, 107, 26, .55), rgba(255, 107, 26, .06));
}

.page-about .verify__step:last-child::before {
  display: none;
}

.page-about .verify__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 31px;
  height: 31px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 107, 26, .6);
  border-radius: 50%;
  background: rgba(255, 107, 26, .1);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--signal);
}

.page-about .verify__step-title {
  margin: 3px 0 7px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--light);
}

.page-about .verify__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.62;
  color: rgba(244, 247, 243, .76);
}

.page-about .verify__note {
  margin: 24px 0 0;
  padding: 13px 15px;
  border-left: 2px solid var(--signal);
  background: rgba(255, 107, 26, .08);
  font-size: 14px;
  line-height: 1.62;
  color: rgba(244, 247, 243, .84);
}

.page-about .verify__figure {
  margin: 24px 0 0;
}

/* ---------- 赛季沿革 ---------- */
.page-about .chronicle__head {
  max-width: 62ch;
}

.page-about .chronicle__head h2 {
  margin: 10px 0 12px;
  font-size: 24px;
  line-height: 1.34;
  color: var(--ink);
}

.page-about .chronicle__head .lede {
  color: var(--field-ink);
}

.page-about .chronicle__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 28px;
}

.page-about .chronicle__rail {
  border-top: 1px solid var(--hair-dark);
  padding-top: 12px;
}

.page-about .chronicle__scale {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .chronicle__tick {
  flex: none;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 12px;
  border: 1px solid var(--hair-dark);
  border-radius: 999px;
  white-space: nowrap;
}

.page-about .chronicle__tick-key {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
}

.page-about .chronicle__tick-val {
  font-size: 12px;
  color: var(--field-ink);
}

.page-about .chronicle__items {
  display: grid;
  gap: 16px;
}

.page-about .timeline__item {
  position: relative;
  padding: 4px 0 4px 22px;
  border-left: 2px solid rgba(14, 43, 36, .12);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--light);
  border: 2px solid var(--signal);
}

.page-about .timeline__item .fold__head {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  margin: 0;
  padding: 10px 0;
  background: none;
  border: 0;
  text-align: left;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

.page-about .timeline__item .fold__num {
  flex: none;
  padding: 4px 9px;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--light);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about .timeline__item .fold__title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.42;
  color: var(--ink);
}

.page-about .timeline__item .fold__sign {
  position: relative;
  flex: none;
  margin-left: auto;
  width: 22px;
  height: 22px;
  border: 1px solid var(--hair-dark);
  border-radius: 50%;
}

.page-about .timeline__item .fold__sign::before,
.page-about .timeline__item .fold__sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: var(--field-ink);
}

.page-about .timeline__item .fold__sign::before {
  width: 9px;
  height: 1px;
}

.page-about .timeline__item .fold__sign::after {
  width: 1px;
  height: 9px;
}

.page-about .chronicle__items .fold .fold__body {
  display: block;
}

.page-about .timeline__item .fold__inner {
  padding: 0 0 6px;
  font-size: 15px;
  line-height: 1.64;
  color: var(--field-ink);
}

.page-about .timeline__item .fold__inner p {
  margin: 0 0 9px;
}

.page-about .timeline__item .fold__inner ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .timeline__item .fold__inner li {
  margin-bottom: 5px;
}

.page-about .timeline__item .fold__inner li::marker {
  color: var(--signal);
}

.page-about .chronicle__figure {
  margin: 30px 0 0;
}

.page-about .chronicle__figure figcaption {
  margin-top: 11px;
  font-size: 13px;
  line-height: 1.66;
  color: var(--field-ink);
}

/* ---------- 内容共建 ---------- */
.page-about .coop__head {
  max-width: 62ch;
}

.page-about .coop__head h2 {
  margin: 10px 0 12px;
  font-size: 24px;
  line-height: 1.34;
  color: var(--ink);
}

.page-about .coop__head .lede {
  color: var(--field-ink);
}

.page-about .coop .tag-group {
  margin-top: 20px;
}

.page-about .coop__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .coop__item {
  background: #fff;
  border: 1px solid rgba(14, 43, 36, .12);
  border-top: 3px solid var(--indigo);
  border-radius: var(--radius-sm);
  padding: 17px 18px 19px;
  box-shadow: 0 1px 0 rgba(8, 28, 23, .05), 0 18px 34px -30px rgba(8, 28, 23, .8);
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-about .coop__item[data-tags~="fans"] {
  border-top-color: var(--wine);
}

.page-about .coop__item[data-tags~="campus"] {
  border-top-color: var(--grass);
}

.page-about .coop__item:hover {
  transform: translateY(-2px);
  box-shadow: 0 1px 0 rgba(8, 28, 23, .05), 0 24px 40px -28px rgba(8, 28, 23, .85);
}

.page-about .coop__tag {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid rgba(14, 43, 36, .16);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--field-ink);
}

.page-about .coop__item h3 {
  margin: 12px 0 8px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .coop__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.64;
  color: var(--field-ink);
}

/* ---------- 服务与响应 ---------- */
.page-about .promise {
  background: linear-gradient(160deg, var(--wine) 0%, #571725 100%);
  color: var(--light);
  border-radius: var(--radius);
  padding: 28px 20px 30px;
  box-shadow: var(--paper-shadow);
}

.page-about .promise h2 {
  margin: 12px 0 0;
  font-size: 24px;
  line-height: 1.34;
  color: var(--light);
}

.page-about .promise__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border: 1px solid rgba(244, 247, 243, .16);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: rgba(244, 247, 243, .16);
}

.page-about .promise__item {
  background: rgba(8, 28, 23, .3);
  padding: 16px 16px 18px;
}

.page-about .promise__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--amber);
}

.page-about .promise__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.64;
  color: rgba(244, 247, 243, .82);
}

.page-about .support__contact {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid rgba(244, 247, 243, .18);
  font-size: 14px;
  line-height: 1.86;
  color: rgba(244, 247, 243, .84);
}

.page-about .support__contact p {
  margin: 0 0 6px;
}

.page-about .support__contact a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 71, .5);
}

.page-about .support__contact a:hover,
.page-about .support__contact a:focus-visible {
  border-bottom-color: var(--amber);
}

/* ---------- 收束 ---------- */
.page-about .about-outro {
  background: var(--ink);
  color: var(--light);
  padding: 30px 0 34px;
}

.page-about .about-outro__inner {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
}

.page-about .about-outro__update {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.76;
  color: rgba(244, 247, 243, .74);
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 32px 0 54px;
  }

  .page-about .about-hero__title {
    font-size: 42px;
  }

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

  .page-about .section {
    padding: 60px 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: 34px;
  }

  .page-about .about-team__title,
  .page-about .verify__title,
  .page-about .chronicle__head h2,
  .page-about .coop__head h2,
  .page-about .promise h2 {
    font-size: 28px;
  }

  .page-about .verify__panel {
    padding: 36px 34px 38px;
  }

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

  .page-about .about-outro__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-outro__links {
    flex: none;
  }
}

/* ---------- 桌面：左侧赛季刻度固定 ---------- */
@media (min-width: 900px) {
  .page-about .chronicle__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 38px;
  }

  .page-about .chronicle__rail {
    position: sticky;
    top: 104px;
    align-self: start;
    border-top: 0;
    padding-top: 0;
  }

  .page-about .chronicle__scale {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .chronicle__tick {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 0 11px 14px;
    border: 0;
    border-left: 2px solid var(--hair-dark);
    border-radius: 0;
  }

  .page-about .chronicle__tick:first-child {
    border-left-color: var(--signal);
  }

  .page-about .chronicle__tick-val {
    margin-left: auto;
  }

  .page-about .chronicle__tick-key {
    font-size: 14px;
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 1040px) {
  .page-about .about-hero__title {
    font-size: 56px;
  }

  .page-about .about-team__title,
  .page-about .verify__title,
  .page-about .chronicle__head h2,
  .page-about .coop__head h2,
  .page-about .promise h2 {
    font-size: 31px;
  }

  .page-about .verify__panel {
    padding: 44px 48px 46px;
  }

  .page-about .promise {
    padding: 40px 44px 42px;
  }

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

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

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__index a,
  .page-about .coop__item {
    transition: none;
  }

  .page-about .coop__item:hover {
    transform: none;
  }
}