/* ===== 品牌自述页 ===== */
.page-about {
  background:
    radial-gradient(120% 68% at 88% -8%, rgba(52, 226, 212, .13), transparent 62%),
    radial-gradient(90% 56% at 4% 6%, rgba(255, 106, 69, .09), transparent 58%),
    var(--ink-900);
  color: var(--text-bright);
  font-family: var(--font-sans);
  overflow-x: hidden;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about h1,
.page-about h2,
.page-about h3,
.page-about p {
  overflow-wrap: break-word;
  word-break: break-word;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---- 面包屑 ---- */
.page-about .crumb {
  padding: clamp(20px, 3vw, 34px) 0 0;
}

.page-about .crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55em;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .crumb-list li + li::before {
  content: "/";
  margin-right: .55em;
  color: var(--line-soft);
}

.page-about .crumb-list a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .crumb-list a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .crumb-current {
  color: var(--coral);
}

/* ---- 首屏 ---- */
.page-about .about-hero {
  padding: clamp(30px, 5vw, 60px) 0 clamp(34px, 5.4vw, 78px);
  border-bottom: 1px solid var(--line-cool);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 4.4vw, 56px);
  align-items: end;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: .8em;
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-kicker::before {
  content: "";
  width: 36px;
  height: 2px;
  flex: none;
  background: var(--coral);
}

.page-about .about-hero h1 {
  margin: .3em 0 .46em;
  font-size: clamp(2.15rem, 7.6vw, 5.1rem);
  font-weight: 900;
  line-height: .99;
  letter-spacing: -.035em;
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.85;
  color: var(--text-mute);
}

.page-about .about-hero-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 22px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: clamp(18px, 2.4vw, 24px) 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero-meta li {
  display: flex;
  align-items: baseline;
  gap: .55em;
  min-width: 0;
}

.page-about .about-hero-meta .num {
  font-size: 1.32rem;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: -.01em;
}

.page-about .about-hero-meta span:last-child {
  font-size: .84rem;
  line-height: 1.5;
  color: var(--steel);
}

/* ---- 图片容器 ---- */
.page-about .figure {
  margin: 0;
}

.page-about .figure-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--glass-line);
  background: var(--ink-700);
  box-shadow: var(--shadow-card);
}

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

.page-about .figure-cap {
  margin-top: .85em;
  font-size: .78rem;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--steel);
}

.page-about .about-hero-figure .figure-media {
  border-radius: var(--radius);
}

/* ---- 章节索引条 ---- */
.page-about .about-index {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  padding: 16px 0;
}

.page-about .about-index-label {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--coral);
  flex: none;
}

.page-about .about-index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index-list a {
  display: inline-flex;
  align-items: baseline;
  gap: .5em;
  font-size: .88rem;
  color: var(--text-mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-index-list a:hover {
  color: var(--text-bright);
  border-bottom-color: var(--coral);
}

.page-about .about-index-list .num {
  font-size: .72rem;
  color: var(--cyan);
  letter-spacing: .1em;
}

/* ---- 章节通用 ---- */
.page-about .about-chapter {
  padding: clamp(44px, 6.4vw, 104px) 0;
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter-inner {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.page-about .about-chapter-idx {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 14px;
  font-size: .76rem;
  letter-spacing: .2em;
  color: var(--steel);
}

.page-about .about-chapter-idx::after {
  content: "";
  width: 46px;
  height: 2px;
  background: var(--coral);
  flex: none;
}

.page-about .about-chapter-title {
  margin: 0 0 .55em;
  font-size: clamp(1.6rem, 3.8vw, 2.85rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.022em;
}

.page-about .about-chapter-lead {
  margin: 0;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-mute);
}

.page-about .about-chapter-body {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  min-width: 0;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-mute);
}

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

.page-about .about-prose p:first-child {
  color: var(--text-bright);
}

.page-about .about-prose--tight p {
  margin-bottom: 0;
}

/* ---- 侧栏卡片 ---- */
.page-about .about-side-card {
  padding: clamp(20px, 2.6vw, 28px);
  border-radius: var(--radius);
}

.page-about .card-idx {
  display: inline-flex;
  align-items: baseline;
  gap: .45em;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .card-title {
  margin: 0 0 .6em;
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .card-body {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--text-mute);
}

/* ---- 团队数字 ---- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: .4em;
  min-height: 118px;
  padding: 20px 18px;
  background: var(--ink-800);
}

.page-about .stat-value {
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--text-bright);
}

.page-about .stat-value.is-lime {
  color: var(--lime);
}

.page-about .stat-label {
  font-size: .82rem;
  line-height: 1.5;
  letter-spacing: .05em;
  color: var(--steel);
}

/* ---- 时间轴 ---- */
.page-about .about-timeline-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
  min-width: 0;
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 16px;
  padding-left: 4px;
  min-width: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(52, 226, 212, .06));
}

.page-about .tl-item {
  position: relative;
  padding-left: 44px;
}

.page-about .tl-item > summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-sm);
  background: var(--glass);
  transition: border-color .24s var(--ease), background .24s var(--ease), transform .24s var(--ease);
}

.page-about .tl-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-item > summary::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 50%;
  width: 13px;
  height: 13px;
  margin-top: -6.5px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-sizing: border-box;
  transition: background .24s var(--ease), border-color .24s var(--ease);
}

.page-about .tl-item > summary:hover {
  border-color: var(--line-cool);
  transform: translateX(2px);
}

.page-about .tl-item[open] > summary {
  border-color: var(--coral);
  background: rgba(255, 106, 69, .07);
}

.page-about .tl-item[open] > summary::before {
  background: var(--coral);
  border-color: var(--coral);
}

.page-about .tl-year {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .tl-item[open] .tl-year {
  color: var(--coral);
}

.page-about .about-tl-tag {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--text-mute);
}

.page-about .tl-body {
  margin: 0;
  padding: 14px 4px 6px 4px;
  max-width: 40em;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--text-mute);
}

.page-about .about-timeline-figure .figure-media {
  aspect-ratio: 2 / 3;
}

.page-about .about-timeline-figure .figure-media img {
  height: 100%;
}

/* ---- 协作章节 ---- */
.page-about .about-partner-figure .figure-media img {
  aspect-ratio: 3 / 2;
}

.page-about .about-chapter--reverse .about-chapter-head {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

/* ---- 引用块 ---- */
.page-about .about-quote-card {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--radius);
  border: 1px solid var(--glass-line);
  background: linear-gradient(140deg, rgba(52, 226, 212, .10), rgba(255, 255, 255, .03));
}

.page-about .about-quote {
  margin: 0 0 .7em;
  font-size: clamp(1.08rem, 2.2vw, 1.4rem);
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: -.01em;
  color: var(--text-bright);
}

.page-about .about-quote-from {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--steel);
}

/* ---- 结尾行动区 ---- */
.page-about .about-cta-wrap {
  padding-top: clamp(8px, 2vw, 24px);
}

.page-about .about-cta {
  padding: clamp(26px, 4.4vw, 56px);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--espresso);
}

.page-about .about-cta h2 {
  margin: 0 0 .5em;
  font-size: clamp(1.45rem, 3.4vw, 2.3rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.022em;
}

.page-about .about-cta p {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(36, 26, 21, .78);
}

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

.page-about .about-cta .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .74em 1.35em;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: .94rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-cta .btn-coral {
  background: var(--coral);
  color: #1A0D08;
}

.page-about .about-cta .btn-coral:hover {
  transform: translateY(-1px);
  background: #FF7F5F;
}

.page-about .about-cta .btn-ghost {
  border-color: rgba(36, 26, 21, .26);
  color: var(--espresso);
}

.page-about .about-cta .btn-ghost:hover {
  border-color: var(--espresso);
  transform: translateY(-1px);
}

.page-about .about-cta .btn:focus-visible {
  outline: 2px solid var(--espresso);
  outline-offset: 3px;
}

/* ---- 响应式 ---- */
@media (min-width: 620px) {
  .page-about .about-hero-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }

  .page-about .about-chapter--wide .about-chapter-inner {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  }

  .page-about .about-chapter--wide .about-chapter-head {
    position: relative;
  }

  .page-about .about-chapter--narrow .about-chapter-inner {
    grid-template-columns: minmax(0, 1fr);
    max-width: 780px;
    margin-left: auto;
  }

  .page-about .about-chapter--narrow .about-chapter-body {
    padding-left: clamp(0px, 4vw, 64px);
  }

  .page-about .about-chapter--reverse .about-partner-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .about-partner-grid .about-chapter-head {
    margin-bottom: clamp(18px, 2.4vw, 28px);
  }
}

@media (min-width: 1020px) {
  .page-about .about-timeline-grid {
    grid-template-columns: minmax(0, 1.38fr) minmax(0, .62fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item > summary,
  .page-about .about-cta .btn,
  .page-about .about-index-list a {
    transition: none;
  }
}