.page-about {
  --about-gap: clamp(20px, 4vw, 44px);
  background: var(--deep);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .section {
  padding-block: clamp(40px, 7vw, 84px);
}

.page-about h1 {
  font-size: clamp(2.05rem, 8vw, 4.3rem);
  line-height: 1.03;
  letter-spacing: -0.025em;
  font-weight: 900;
  margin: 0.15em 0 0.5em;
  color: var(--paper);
}

.page-about h2 {
  font-size: clamp(1.45rem, 4.4vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  font-weight: 900;
  margin: 0 0 0.6em;
  color: var(--paper);
}

.page-about h3 {
  line-height: 1.4;
}

.page-about .about-lead,
.page-about .about-hero__lead {
  color: var(--mist);
  line-height: 1.8;
  max-width: 46ch;
  font-size: 1rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(18px, 4vw, 38px);
  padding-bottom: clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 90% at 92% 0%, rgba(255, 106, 43, 0.16), transparent 62%),
    var(--deep);
}

.page-about .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-hero__side .eyebrow {
  margin-bottom: 14px;
}

.page-about .about-hero__note {
  margin: 0;
  max-width: 24em;
  padding-top: 14px;
  border-top: 2px solid var(--orange);
  color: var(--mist);
  font-size: 0.92rem;
  line-height: 1.75;
}

.page-about .about-hero__lead {
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  max-width: 44ch;
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(20px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-top: 10px;
  border-top: 1px solid var(--line-strong);
  font-size: 0.78rem;
  color: var(--mist);
  letter-spacing: 0.02em;
}

.page-about .about-stats .num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.4vw, 1.95rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-jump a {
  display: inline-block;
  padding: 4px 14px 5px 0;
  margin-right: 14px;
  border-right: 1px solid var(--line);
  color: var(--mist);
  text-decoration: none;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .about-jump a:last-child {
  border-right: 0;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--paper);
  box-shadow: inset 0 -2px 0 var(--orange);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-origin__text p {
  color: var(--mist);
  line-height: 1.85;
  font-size: 1rem;
  margin: 0.9em 0;
  max-width: 40ch;
}

.page-about .about-origin__lead::first-letter {
  float: left;
  font-size: 3em;
  line-height: 0.86;
  padding: 0.06em 0.14em 0 0;
  font-weight: 900;
  color: var(--orange);
}

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

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

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

.page-about .media__caption {
  margin-top: 10px;
  color: var(--mist);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  line-height: 1.7;
}

/* ---------- 斜线分隔 ---------- */
.page-about .slant-rule {
  height: 24px;
  border-block: 1px solid var(--line);
  background-image: repeating-linear-gradient(
    115deg,
    rgba(255, 106, 43, 0.55) 0 2px,
    transparent 2px 15px
  );
  opacity: 0.45;
}

/* ---------- 年表 ---------- */
.page-about .about-band__head {
  max-width: 60ch;
}

.page-about .about-band__media {
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .timeline {
  list-style: none;
  margin: clamp(22px, 4vw, 36px) 0 0;
  padding: 0 0 10px;
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  border-top: 1px solid var(--line);
}

.page-about .timeline__node {
  flex: 0 0 76%;
  scroll-snap-align: start;
  padding: 22px 20px 24px 20px;
  border-left: 2px solid var(--orange);
  transition: background 0.18s ease;
}

.page-about .timeline__node:hover,
.page-about .timeline__node:focus-visible,
.page-about .timeline__node:focus-within {
  background: rgba(242, 245, 241, 0.05);
}

.page-about .timeline__node:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -2px;
}

.page-about .timeline__year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .timeline__desc {
  margin: 0;
  color: var(--mist);
  font-size: 0.87rem;
  line-height: 1.75;
}

.page-about .timeline__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  color: var(--amber);
  font-size: 0.82rem;
  line-height: 1.7;
  transition: max-height 0.24s ease, opacity 0.24s ease, margin-top 0.24s ease;
}

.page-about .timeline__node:hover .timeline__more,
.page-about .timeline__node:focus-visible .timeline__more,
.page-about .timeline__node:focus-within .timeline__more {
  max-height: 7em;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 团队 ---------- */
.page-about .about-team__media {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .team-grid {
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .team-card {
  background: var(--panel);
  padding: clamp(18px, 2.6vw, 26px);
  clip-path: polygon(
    0 0,
    calc(100% - 18px) 0,
    100% 18px,
    100% 100%,
    18px 100%,
    0 calc(100% - 18px)
  );
  transition: background 0.18s ease;
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible,
.page-about .team-card:focus-within {
  background: var(--panel-2);
}

.page-about .team-card:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -3px;
}

.page-about .team-card__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .team-card__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .team-card__count span {
  margin-left: 4px;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .team-card__body h3 {
  margin: 12px 0 8px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .team-card__body p {
  margin: 0;
  color: var(--mist);
  font-size: 0.86rem;
  line-height: 1.78;
}

.page-about .team-card__more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0 !important;
  color: var(--amber) !important;
  transition: max-height 0.24s ease, opacity 0.24s ease, margin-top 0.24s ease;
}

.page-about .team-card:hover .team-card__more,
.page-about .team-card:focus-visible .team-card__more,
.page-about .team-card:focus-within .team-card__more {
  max-height: 8em;
  opacity: 1;
  margin-top: 10px !important;
}

/* ---------- 访问体验 ---------- */
.page-about .about-region {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-region__copy p {
  color: var(--mist);
  line-height: 1.85;
  margin: 0.9em 0;
  max-width: 42ch;
}

.page-about .about-region__plates {
  display: grid;
  gap: 12px;
}

.page-about .plate {
  background: var(--panel);
}

.page-about .plate__label {
  color: var(--mist);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
}

.page-about .plate__value {
  display: block;
  margin-top: 6px;
  color: var(--paper);
  font-size: 1.05rem;
  font-weight: 700;
}

.page-about .plate__value.num {
  font-family: var(--font-mono);
  color: var(--lime);
}

/* ---------- 合作 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .partner-item {
  padding: clamp(18px, 3vw, 26px);
  border-left: 2px solid var(--orange);
  background: rgba(242, 245, 241, 0.05);
}

.page-about .partner-item__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .partner-item h3 {
  margin: 10px 0 8px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .partner-item p {
  margin: 0;
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.8;
}

/* ---------- 固定入口 ---------- */
.page-about .about-entrance {
  border-left: 2px solid var(--orange);
  padding-left: clamp(18px, 3vw, 34px);
}

.page-about .about-entrance p {
  color: var(--mist);
  line-height: 1.85;
  margin: 0.85em 0;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 继续浏览 ---------- */
.page-about .about-more {
  border-top: 1px solid var(--line);
  background: var(--ink);
}

.page-about .about-more__inner {
  display: grid;
  gap: 2px;
  padding-block: clamp(16px, 3vw, 26px);
}

.page-about .about-more__inner a {
  display: block;
  padding: 12px 0;
  color: var(--mist);
  text-decoration: none;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--line);
  transition: color 0.16s ease, padding-left 0.16s ease;
}

.page-about .about-more__inner a:last-child {
  border-bottom: 0;
}

.page-about .about-more__inner a:hover,
.page-about .about-more__inner a:focus-visible {
  color: var(--paper);
  padding-left: 6px;
  box-shadow: inset 0 -2px 0 var(--orange);
}

/* ---------- 断点 ---------- */
@media (max-width: 719px) {
  .page-about .timeline__more,
  .page-about .team-card__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px !important;
  }
}

@media (min-width: 520px) {
  .page-about .about-region__plates {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-more__inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .about-more__inner a {
    border-bottom: 0;
  }
}

@media (min-width: 640px) {
  .page-about .timeline__node {
    flex-basis: 34%;
  }
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: 4fr 8fr;
    align-items: start;
  }
}

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

  .page-about .about-region {
    grid-template-columns: 6fr 5fr;
    align-items: center;
  }

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

  .page-about .team-card--full {
    grid-column: 1 / -1;
    display: flex;
    gap: clamp(20px, 3vw, 36px);
    align-items: flex-start;
  }

  .page-about .team-card--full .team-card__head {
    flex: 0 0 auto;
    min-width: 150px;
  }

  .page-about .team-card--full .team-card__body {
    flex: 1 1 auto;
  }

  .page-about .partner-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 1000px) {
  .page-about .timeline__node {
    flex-basis: 20%;
  }
}