.page-about {
  --about-rail: 214px;
  --about-line: rgba(11, 15, 20, .14);
  background: var(--mist);
  color: var(--ink);
  padding-bottom: clamp(36px, 6vw, 76px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 30px);
  padding-top: clamp(16px, 3vw, 30px);
}

.page-about .about-rail {
  align-self: start;
  min-width: 0;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--soil);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--about-line);
}

.page-about .about-timeline a {
  display: block;
  padding: 8px 2px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--stand);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-timeline a:hover,
.page-about .about-timeline a:focus-visible {
  color: var(--night);
  border-bottom-color: var(--neon);
  background: rgba(183, 255, 60, .14);
  outline: none;
}

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

.page-about .about-main__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--soil);
}

.page-about h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 4.3rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--night);
  margin: 0 0 clamp(14px, 2.6vw, 24px);
  max-width: 20ch;
}

.page-about .lede {
  max-width: 62ch;
  color: var(--stand);
}

.page-about .about-main .figure {
  margin: clamp(22px, 4vw, 40px) 0 0;
}

.page-about .about-section {
  padding: clamp(42px, 7.5vw, 88px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-section--night {
  background: var(--night);
  border-top-color: rgba(244, 246, 248, .12);
  color: var(--mist);
}

.page-about .about-head {
  max-width: 760px;
  margin-bottom: clamp(20px, 3.6vw, 38px);
}

.page-about .about-head__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--soil);
}

.page-about .about-head--night .about-head__idx {
  color: var(--neon);
}

.page-about .about-head h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.5rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--night);
  margin: 0;
}

.page-about .about-head--night h2 {
  color: var(--mist);
}

.page-about .about-head__sub {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.7;
  color: var(--mute);
}

.page-about .about-copy p {
  max-width: 72ch;
  margin: 0 0 1em;
  font-size: clamp(15.5px, 1.05vw, 17.5px);
  line-height: 1.72;
  color: var(--stand);
}

.page-about .about-section--night .about-copy p {
  color: rgba(244, 246, 248, .82);
}

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

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.4vw, 40px);
}

.page-about .about-note {
  border-left: 3px solid var(--soil);
  padding: 4px 0 4px 18px;
}

.page-about .about-note__line {
  margin: 0 0 12px;
  font-size: clamp(16px, 1.4vw, 20px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--night);
}

.page-about .about-note__meta {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mute);
}

.page-about .center-facts {
  list-style: none;
  margin: clamp(22px, 3.4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .center-facts__item {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .center-facts__k {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--soil);
}

.page-about .center-facts__v {
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.65;
  color: var(--stand);
}

/* 区域切换 */
.page-about .region-tabs {
  position: relative;
}

.page-about .region-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .region-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .region-chips label {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  color: rgba(244, 246, 248, .78);
  background: rgba(48, 54, 61, .55);
  border: 1px solid rgba(244, 246, 248, .16);
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .region-chips label:hover {
  border-color: var(--neon);
  color: var(--mist);
}

.page-about #region-yn:checked ~ .region-chips label[for="region-yn"],
.page-about #region-sc:checked ~ .region-chips label[for="region-sc"],
.page-about #region-gz:checked ~ .region-chips label[for="region-gz"],
.page-about #region-gx:checked ~ .region-chips label[for="region-gx"],
.page-about #region-gd:checked ~ .region-chips label[for="region-gd"],
.page-about #region-cq:checked ~ .region-chips label[for="region-cq"] {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--night);
}

.page-about .region-panel {
  display: none;
  background: rgba(48, 54, 61, .42);
  border: 1px solid rgba(244, 246, 248, .14);
  border-left: 4px solid var(--soil);
  padding: clamp(18px, 2.8vw, 30px);
}

.page-about .region-panel__hub {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--mist);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .region-panel p:last-child {
  margin: 0;
  max-width: 72ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.75;
  color: rgba(244, 246, 248, .82);
}

.page-about #region-yn:checked ~ .region-panels .region-panel[data-region="yn"],
.page-about #region-sc:checked ~ .region-panels .region-panel[data-region="sc"],
.page-about #region-gz:checked ~ .region-panels .region-panel[data-region="gz"],
.page-about #region-gx:checked ~ .region-panels .region-panel[data-region="gx"],
.page-about #region-gd:checked ~ .region-panels .region-panel[data-region="gd"],
.page-about #region-cq:checked ~ .region-panels .region-panel[data-region="cq"] {
  display: block;
}

.page-about .about-index {
  list-style: none;
  margin: clamp(28px, 4.4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(244, 246, 248, .14);
  border: 1px solid rgba(244, 246, 248, .14);
}

.page-about .about-index__item {
  background: var(--night);
  padding: clamp(14px, 2vw, 22px) clamp(14px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-index__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.7rem, 4.6vw, 2.9rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--neon);
}

.page-about .about-index__label {
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(244, 246, 248, .72);
}

/* 团队角色 */
.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .team-card {
  background: var(--paper);
  padding: clamp(18px, 2.6vw, 30px);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .team-card:hover {
  background: var(--paper-2);
  box-shadow: inset 0 0 0 1px var(--plateau);
}

.page-about .team-card__idx {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--soil);
  margin-bottom: 10px;
}

.page-about .team-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  letter-spacing: -.01em;
  color: var(--night);
}

.page-about .team-card p {
  margin: 0;
  font-size: clamp(14.5px, 1vw, 16.5px);
  line-height: 1.72;
  color: var(--stand);
}

/* 场馆费用比较 */
.page-about .venue-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.4vw, 40px);
}

.page-about .venue-layout .figure {
  margin: 0;
}

.page-about .field-list {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .field-list__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
  transition: background var(--dur) var(--ease);
}

.page-about .field-list__item:hover {
  background: rgba(31, 111, 235, .06);
}

.page-about .field-list__no {
  grid-row: span 2;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  color: var(--sand);
  padding-top: 2px;
}

.page-about .field-list__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--night);
  letter-spacing: -.01em;
}

.page-about .field-list__desc {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--mute);
}

/* 服务对象 */
.page-about .clients-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.4vw, 40px);
}

.page-about .client-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .client-card {
  background: var(--paper);
  padding: clamp(16px, 2.4vw, 26px);
  border-left: 4px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .client-card:hover,
.page-about .client-card:focus-within {
  border-left-color: var(--neon);
  background: var(--paper-2);
}

.page-about .client-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.05rem, 1.7vw, 1.25rem);
  color: var(--night);
}

.page-about .client-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--stand);
}

.page-about .client-card__extra {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  color: var(--plateau) !important;
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
}

.page-about .client-card:hover .client-card__extra,
.page-about .client-card:focus-within .client-card__extra {
  max-height: 120px;
  opacity: 1;
  margin-top: 8px;
}

.page-about .clients-layout .figure {
  margin: 0;
}

/* 合作生态 */
.page-about .partner-grid {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .partner-item {
  background: var(--mist);
  padding: clamp(16px, 2.4vw, 26px);
}

.page-about .partner-item__k {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--paper);
  background: var(--soil-deep);
}

.page-about .partner-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--stand);
}

/* 底部行动区 */
.page-about .about-cta {
  margin-top: clamp(34px, 6vw, 66px);
  background: linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
  border-top: 3px solid var(--soil);
  clip-path: polygon(0 0, 100% 3.2%, 100% 100%, 0 100%);
  padding-top: clamp(34px, 5.5vw, 62px);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.2vw, 40px);
  padding-bottom: clamp(34px, 5.5vw, 62px);
}

.page-about .about-cta__kicker {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--soil);
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--night);
  max-width: 24ch;
}

.page-about .about-cta__text p:last-child {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.72;
  color: var(--stand);
}

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

.page-about .about-cta__actions .btn {
  flex: 1 1 auto;
  min-width: 168px;
  text-align: center;
}

@media (max-width: 639px) {
  .page-about .region-chips label {
    padding: 8px 13px;
    font-size: 13px;
  }
  .page-about .about-index {
    grid-template-columns: 1fr;
  }
  .page-about .field-list__item {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 4px 10px;
  }
  .page-about .about-cta__actions .btn {
    min-width: 100%;
  }
}

@media (min-width: 640px) {
  .page-about .center-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 clamp(16px, 2.4vw, 32px);
  }
  .page-about .center-facts__item {
    grid-template-rows: auto 1fr;
  }
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .client-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-index {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .field-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 clamp(20px, 3vw, 44px);
  }
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 5vw, 68px);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .venue-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .clients-layout {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }
  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
  .page-about .about-cta__actions .btn {
    flex: 0 1 auto;
    min-width: 0;
  }
}

@media (min-width: 1180px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .partner-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-index {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .field-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
</main>