.page-about {
  --about-line: rgba(124, 129, 126, 0.3);
  --about-line-strong: rgba(11, 20, 36, 0.14);
  --about-paper: #e9e4d8;
  background: var(--warm);
  color: var(--night);
  font-family: var(--font-body);
}

/* 顶部赛程条 */
.page-about .about-ticker {
  background: var(--green-deep);
  color: var(--chalk);
  border-bottom: 1px solid rgba(215, 255, 63, 0.28);
}

.page-about .about-ticker-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding-top: 11px;
  padding-bottom: 11px;
}

.page-about .about-ticker-tag {
  flex: none;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--lime);
  color: var(--night);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .about-ticker-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(244, 241, 230, 0.82);
}

.page-about .about-ticker-link {
  margin-left: auto;
  flex: none;
  color: var(--lime);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(215, 255, 63, 0.45);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-ticker-link:hover,
.page-about .about-ticker-link:focus-visible {
  color: var(--chalk);
  border-color: var(--chalk);
}

@media (max-width: 560px) {
  .page-about .about-ticker-text {
    display: none;
  }
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--chalk);
  padding-bottom: 44px;
}

.page-about .about-hero-media {
  position: absolute;
  inset: 0;
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
  filter: saturate(0.55) contrast(1.05);
}

.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 20, 36, 0.55) 0%, rgba(11, 20, 36, 0.84) 55%, #0b1424 100%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  padding-top: 22px;
  padding-bottom: 8px;
}

.page-about .about-hero .breadcrumb-link {
  color: rgba(244, 241, 230, 0.68);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb-link:hover,
.page-about .about-hero .breadcrumb-link:focus-visible {
  color: var(--lime);
}

.page-about .about-hero .breadcrumb-current {
  color: var(--lime);
}

.page-about .about-hero .eyebrow {
  margin-top: 22px;
  color: var(--lime);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 8.6vw, 82px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin: 12px 0 20px;
  max-width: 15em;
}

.page-about .about-hero-lead {
  max-width: 46ch;
  margin: 0;
  font-size: clamp(16px, 2.1vw, 19px);
  line-height: 1.85;
  color: rgba(244, 241, 230, 0.86);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 主体：左索引 + 右阅读流 */
.page-about .about-body {
  display: grid;
  gap: 30px;
  padding-top: 40px;
  padding-bottom: 56px;
}

.page-about .about-index {
  border-top: 2px solid var(--night);
  padding-top: 12px;
}

.page-about .about-index-head {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(11, 20, 36, 0.55);
}

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

.page-about .about-index-item {
  flex: none;
}

.page-about .about-index-item a {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--about-line-strong);
  background: rgba(244, 241, 230, 0.55);
  color: var(--night);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-index-num {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  color: var(--grass);
}

.page-about .about-index-item a:hover,
.page-about .about-index-item a:focus-visible {
  background: var(--night);
  border-color: var(--night);
  color: var(--chalk);
}

.page-about .about-index-item a:hover .about-index-num,
.page-about .about-index-item a:focus-visible .about-index-num {
  color: var(--lime);
}

/* 章节通用 */
.page-about .about-chapter {
  padding-bottom: 38px;
  margin-bottom: 38px;
  border-bottom: 1px solid var(--about-line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-chapter:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-chapter-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-chapter-num {
  flex: none;
  display: inline-grid;
  place-items: center;
  min-width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--night);
  color: var(--lime);
  font-family: var(--font-num);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-chapter h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 4.4vw, 40px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-about .about-chapter p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(11, 20, 36, 0.84);
}

.page-about .about-chapter h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
}

.page-about .about-quote {
  margin: 22px 0 0;
  padding: 16px 20px;
  border-left: 4px solid var(--lime);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: rgba(31, 122, 77, 0.1);
  font-size: 16px;
  line-height: 1.75;
  color: rgba(11, 20, 36, 0.9);
}

/* 三条原则 */
.page-about .about-principles {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-principle {
  border: 1px solid var(--about-line-strong);
  border-radius: var(--radius-m);
  background: rgba(244, 241, 230, 0.62);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-principle[open] {
  background: #f4f1e6;
  border-color: rgba(31, 122, 77, 0.55);
}

.page-about .about-principle summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
}

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

.page-about .about-principle summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-num);
  font-size: 22px;
  font-weight: 700;
  color: var(--grass);
}

.page-about .about-principle[open] summary::after {
  content: "\2212";
}

.page-about .about-principle-num {
  flex: none;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  color: var(--grass);
  letter-spacing: 0.06em;
}

.page-about .about-principle-name {
  min-width: 0;
}

.page-about .about-principle-body {
  padding: 0 18px 16px 18px;
}

.page-about .about-principle-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(11, 20, 36, 0.82);
}

/* 看台剖面 */
.page-about .about-cutaway {
  margin-top: 22px;
  padding: 16px 14px 20px;
  border-radius: var(--radius-l);
  background: linear-gradient(160deg, #0b1424 0%, #0e3b2a 100%);
  color: var(--chalk);
}

.page-about .about-cutaway svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-steps {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  padding: 8px 0 8px 14px;
  border-left: 2px solid rgba(215, 255, 63, 0.5);
}

.page-about .about-step h3 {
  color: var(--lime);
  font-size: 17px;
}

.page-about .about-step p {
  margin: 0;
  max-width: none;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 230, 0.8);
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--grass) 55%, rgba(124, 129, 126, 0.6) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 24px 38px;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--warm);
  border: 3px solid var(--grass);
}

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

.page-about .about-timeline-item:last-child::before {
  background: var(--flame);
  border-color: var(--flame);
}

.page-about .about-timeline-tag {
  display: inline-block;
  margin-bottom: 6px;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background: rgba(11, 20, 36, 0.08);
  color: rgba(11, 20, 36, 0.72);
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-about .about-timeline-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

/* 团队协作 */
.page-about .about-team {
  display: grid;
  gap: 20px;
  margin-top: 20px;
}

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

.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-team-figure img,
.page-about .about-scene-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-m);
  filter: saturate(0.6) contrast(1.03);
}

.page-about .about-team-figure figcaption,
.page-about .about-scene-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(11, 20, 36, 0.6);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 24px;
  background: var(--about-line-strong);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--about-paper);
  padding: 16px 14px;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(26px, 4.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--night);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(11, 20, 36, 0.66);
}

.page-about .about-stats-note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(11, 20, 36, 0.64);
}

/* 家庭场景 */
.page-about .about-scene-figure {
  margin: 20px 0 0;
}

.page-about .about-scenes {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-scene {
  padding: 18px 16px;
  border-radius: var(--radius-m);
  border: 1px solid var(--about-line-strong);
  background: rgba(244, 241, 230, 0.62);
}

.page-about .about-scene-tag {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background: var(--lime);
  color: var(--night);
  font-size: 12px;
  font-weight: 700;
}

.page-about .about-scene:nth-child(2) .about-scene-tag {
  background: rgba(31, 122, 77, 0.16);
  color: var(--grass);
}

.page-about .about-scene:nth-child(3) .about-scene-tag {
  background: rgba(255, 90, 54, 0.16);
  color: #b8361b;
}

.page-about .about-scene p {
  margin: 0;
  max-width: none;
  font-size: 15px;
  line-height: 1.8;
}

/* 收束 CTA */
.page-about .about-cta {
  margin-top: 26px;
  padding: 26px 20px;
  border-radius: var(--radius-l);
  background: linear-gradient(140deg, var(--grass) 0%, #143f2d 100%);
  color: var(--chalk);
}

.page-about .about-cta h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.6vw, 30px);
  font-weight: 800;
  color: var(--chalk);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 230, 0.84);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* 桌面栅格 */
@media (min-width: 760px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 22px;
  }

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

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

  .page-about .about-team {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
    gap: 26px;
  }

  .page-about .about-cta {
    padding: 32px 28px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-bottom: 64px;
  }

  .page-about .about-hero-inner {
    padding-top: 30px;
  }

  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 56px;
    padding-top: 60px;
    padding-bottom: 88px;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 18px);
    align-self: start;
  }

  .page-about .about-index-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-index-item a {
    border-color: transparent;
    background: transparent;
    border-radius: var(--radius-s);
    padding: 7px 10px;
  }

  .page-about .about-chapter {
    padding-bottom: 48px;
    margin-bottom: 48px;
  }

  .page-about .about-scene-figure img {
    max-height: 340px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-ticker-link,
  .page-about .about-index-item a,
  .page-about .about-principle {
    transition: none;
  }
}