.page-about {
  --about-line: #FF6B2C;
  --about-line-soft: rgba(255, 107, 44, 0.32);
}

.page-about .about-hero {
  position: relative;
  padding: clamp(32px, 6vw, 72px) 0 clamp(40px, 6vw, 72px);
  background:
    radial-gradient(760px 460px at 84% 6%, rgba(255, 107, 44, 0.16), transparent 64%),
    radial-gradient(620px 420px at 4% 0%, rgba(61, 220, 151, 0.08), transparent 62%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(40px, 9vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin: 14px 0 20px;
  color: var(--ice-text);
  text-transform: none;
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: 32em;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--mist-text);
}

.page-about .about-hero__note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--about-line);
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--ice-text);
}

.page-about .about-hero__note .dot {
  margin-top: 8px;
  flex: 0 0 auto;
}

.page-about .about-hero__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  aspect-ratio: 16 / 11;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
  background: var(--dugout-navy);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 竖排索引：窄屏横向滚动，桌面竖排 */
.page-about .about-index {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 4px 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__item {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid var(--border-navy);
  border-radius: var(--r-pill);
  background: rgba(20, 28, 54, 0.8);
}

.page-about .about-index__num {
  font-size: 0.72rem;
  color: var(--arena-orange);
}

.page-about .about-index__label {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--mist-text);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.25s ease;
}

.page-about .about-index__item:hover .about-index__label,
.page-about .about-index__label:focus-visible {
  color: var(--ice-text);
}

/* 章节骨架 */
.page-about .about-section {
  padding: var(--sp-section) 0;
  border-top: 1px solid var(--border-navy);
}

.page-about .about-section:first-of-type {
  border-top: 0;
}

.page-about .about-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-head__idx {
  margin: 0;
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--arena-orange);
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(27px, 5vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ice-text);
  max-width: 22em;
}

.page-about .about-head p {
  margin: 0;
  max-width: 40em;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--mist-text);
}

/* 左右交替长文块 */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 3.5vw, 44px);
}

.page-about .about-split__text p {
  margin: 0 0 1.15em;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ice-text);
}

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

.page-about .about-pull {
  margin: 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--arena-orange);
}

.page-about .about-pull p {
  margin: 0 0 12px;
  max-width: 22em;
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--ice-text);
}

.page-about .about-pull cite {
  display: block;
  font-style: normal;
  font-family: var(--font-num);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--mist-text);
}

/* 内容准则 */
.page-about .about-principles {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principle {
  position: relative;
  padding: 26px 0 26px 24px;
  border-bottom: 1px solid var(--border-navy);
}

.page-about .about-principle::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  bottom: 26px;
  width: 2px;
  background: var(--about-line-soft);
  transform-origin: center;
  transition: background-color 0.25s ease, transform 0.25s ease;
}

.page-about .about-principle:hover::before {
  background: var(--arena-orange);
  transform: scaleY(1.14);
}

.page-about .about-principle h3 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.16rem;
  line-height: 1.4;
  color: var(--ice-text);
}

.page-about .about-principle__num {
  font-size: 0.78rem;
  color: var(--arena-orange);
}

.page-about .about-principle p {
  margin: 0;
  max-width: 40em;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--mist-text);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: clamp(24px, 3.5vw, 44px);
}

.page-about .about-team__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--dugout-navy);
  aspect-ratio: 8 / 5;
  clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  padding: 20px 22px;
  border: 1px solid var(--border-navy);
  border-radius: var(--r-md);
  background: rgba(20, 28, 54, 0.72);
}

.page-about .about-role h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--arena-orange);
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--mist-text);
}

/* 长期承诺 */
.page-about .about-pledges {
  display: grid;
  gap: 16px;
}

.page-about .about-pledge {
  padding: 24px 22px 26px;
  border: 1px solid var(--border-navy);
  border-top: 3px solid var(--arena-orange);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(20, 28, 54, 0.94), rgba(20, 28, 54, 0.5));
}

.page-about .about-pledge--b {
  border-top-color: var(--score-gold);
}

.page-about .about-pledge--c {
  border-top-color: var(--signal-green);
}

.page-about .about-pledge--d {
  border-top-color: var(--ember-orange-soft);
}

.page-about .about-pledge__tag {
  margin: 0 0 12px;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--mist-text);
}

.page-about .about-pledge h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.14rem;
  line-height: 1.4;
  color: var(--ice-text);
}

.page-about .about-pledge p:last-child {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist-text);
}

/* 版本脉络 */
.page-about .about-timeline__intro {
  display: grid;
  gap: 20px;
  margin-bottom: clamp(24px, 3.5vw, 40px);
}

.page-about .about-timeline__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--dugout-navy);
  aspect-ratio: 5 / 2;
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-timeline__intro p {
  align-self: end;
  margin: 0;
  max-width: 34em;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--mist-text);
}

.page-about .about-timeline {
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 4px 0 18px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-stage {
  position: relative;
  flex: 0 0 min(300px, 78vw);
  scroll-snap-align: start;
  padding: 26px 22px 28px;
  border: 1px solid var(--border-navy);
  border-radius: var(--r-lg);
  background: rgba(20, 28, 54, 0.74);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  top: 0;
  left: 22px;
  width: 44px;
  height: 2px;
  background: var(--arena-orange);
}

.page-about .about-stage__num {
  margin: 0 0 14px;
  font-size: 1.6rem;
  font-weight: 500;
  color: var(--ember-orange-soft);
  letter-spacing: 0.02em;
}

.page-about .about-stage h3 {
  margin: 0 0 10px;
  font-size: 1.06rem;
  font-weight: 500;
  color: var(--ice-text);
}

.page-about .about-stage p:last-child {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--mist-text);
}

/* 合作方式 */
.page-about .about-partners {
  display: grid;
  gap: 16px;
}

.page-about .about-partner {
  padding: 24px 22px;
  border: 1px solid var(--border-navy);
  border-radius: var(--r-lg);
  background: rgba(11, 18, 38, 0.6);
}

.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.1rem;
  color: var(--ice-text);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist-text);
}

.page-about .about-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(24px, 3.5vw, 36px);
  border: 1px solid var(--border-navy);
  border-radius: var(--r-lg);
  background:
    linear-gradient(120deg, rgba(255, 107, 44, 0.14), rgba(20, 28, 54, 0.9) 58%);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 30em;
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--ice-text);
}

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

@media (min-width: 720px) {
  .page-about .about-pledges,
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-split__aside {
    padding-top: 6px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: stretch;
  }

  .page-about .about-team__media {
    aspect-ratio: auto;
    min-height: 340px;
  }

  .page-about .about-team__list {
    align-content: start;
  }

  .page-about .about-timeline__intro {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: end;
    gap: 32px;
  }

  .page-about .about-head {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    column-gap: 48px;
    align-items: end;
  }

  .page-about .about-head__idx {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) auto minmax(0, 1fr);
    grid-template-areas: "lead index media";
    align-items: start;
    gap: clamp(24px, 3.2vw, 48px);
  }

  .page-about .about-hero__lead {
    grid-area: lead;
  }

  .page-about .about-index {
    grid-area: index;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    padding: 6px 0 6px 16px;
    border-left: 1px solid var(--border-navy);
    overflow: visible;
    align-self: center;
  }

  .page-about .about-index__item {
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    align-items: flex-start;
  }

  .page-about .about-index__label {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: 0.24em;
    font-size: 0.78rem;
    white-space: normal;
  }

  .page-about .about-hero__media {
    grid-area: media;
    aspect-ratio: 9 / 7;
  }

  .page-about .about-hero__media img {
    transition: transform 0.4s ease;
  }

  .page-about .about-hero__media:hover img {
    transform: scale(1.03);
  }
}

@media (min-width: 1080px) {
  .page-about .about-pledges {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-principle {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
    column-gap: 40px;
    align-items: start;
  }

  .page-about .about-principle h3 {
    margin-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle::before,
  .page-about .about-hero__media img,
  .page-about .about-index__label {
    transition: none;
  }
}