/* ===== 页面基底 ===== */
.page-about {
  position: relative;
  padding-bottom: 5rem;
  background:
    radial-gradient(circle at 88% 12%, rgba(198, 255, 0, 0.07), transparent 32%),
    radial-gradient(circle at 8% 58%, rgba(255, 107, 0, 0.06), transparent 28%),
    var(--bg-primary);
  overflow-x: hidden;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumbs {
  padding-top: 1.5rem;
}

/* ===== 首屏 Hero ===== */
.page-about .about-hero {
  padding-top: 2.5rem;
  position: relative;
}

.page-about .about-hero__kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-lime);
  margin: 0 0 1rem;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 8.5vw, 5.8rem);
  font-style: italic;
  font-weight: 900;
  line-height: 0.95;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin: 0 0 1.1rem;
  text-shadow: 4px 4px 0 var(--bg-deep);
  color: var(--text-high);
}

.page-about .about-hero__sub {
  display: block;
  font-family: var(--font-body);
  font-style: normal;
  font-weight: 500;
  font-size: clamp(1.05rem, 3vw, 1.5rem);
  color: var(--accent-orange);
  letter-spacing: 0.05em;
  margin-top: 0.6rem;
  text-shadow: none;
}

.page-about .about-hero__rule {
  height: 8px;
  margin: 0 0 1.75rem;
  background: linear-gradient(
    90deg,
    var(--accent-lime) 0%,
    var(--accent-lime) 42%,
    var(--accent-orange) 42%,
    var(--accent-orange) 68%,
    var(--border) 68%,
    var(--border) 100%
  );
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

.page-about .about-hero__lead {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  line-height: 1.75;
  color: var(--text-muted);
  margin: 0 0 1.25rem;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 2px solid var(--accent-lime);
  transform: translate(12px, 12px);
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero__figure img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  border: 3px solid var(--text-high);
  box-shadow: var(--shadow-hard);
  object-fit: cover;
}

/* ===== 双栏布局 ===== */
.page-about .about-layout {
  margin-top: 4rem;
  display: grid;
  gap: 2.5rem;
}

/* ===== 目录 ===== */
.page-about .about-toc {
  border: 2px solid var(--border);
  background: var(--bg-card);
  padding: 1.25rem;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.22);
}

.page-about .about-toc__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--accent-orange);
  margin: 0 0 0.9rem;
  text-transform: uppercase;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
}

.page-about .about-toc__link {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--border);
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--accent-lime);
  border-color: var(--accent-lime);
}

.page-about .about-toc__link:focus-visible {
  outline: 2px solid var(--accent-lime);
  outline-offset: 2px;
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-orange);
}

/* ===== 章节统一样式 ===== */
.page-about .about-section {
  padding: 2.75rem 0 1rem;
  border-top: 2px solid var(--border);
}

.page-about .about-section:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--accent-lime);
  text-transform: uppercase;
  margin: 0 0 0.5rem;
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  line-height: 1.1;
  margin: 0 0 1.25rem;
  text-transform: uppercase;
  color: var(--text-high);
}

/* ===== 品牌故事 ===== */
.page-about .about-prose p {
  color: var(--text-muted);
  line-height: 1.85;
  margin: 0 0 1.1rem;
  font-size: 1rem;
}

.page-about .about-prose strong {
  color: var(--text-high);
  font-weight: 600;
}

.page-about .about-prose__quote {
  margin: 1.5rem 0;
  padding: 1.1rem 1.4rem;
  border-left: 4px solid var(--accent-orange);
  background: var(--bg-card);
  color: var(--text-high);
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.7;
  font-style: italic;
}

/* ===== 里程碑横幅 ===== */
.page-about .about-milestone-bg {
  margin: 1.5rem 0 0;
  border: 2px solid var(--border);
  box-shadow: var(--shadow-hard);
}

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

/* ===== 时间线 ===== */
.page-about .about-timeline {
  margin-top: 1.6rem;
  border-left: 3px solid var(--accent-orange);
  padding-left: 1.2rem;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-timeline__item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.22);
  transition: border-color 0.2s ease;
}

.page-about .about-timeline__item[open] {
  border-left: 3px solid var(--accent-lime);
}

.page-about .about-timeline__head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__head::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-orange);
  border: 2px solid var(--bg-card);
  box-shadow: 0 0 0 2px var(--accent-orange);
  flex-shrink: 0;
  margin-right: 0.2rem;
}

.page-about .about-timeline__year {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.5rem;
  color: var(--accent-lime);
  min-width: 3.4rem;
}

.page-about .about-timeline__event {
  color: var(--text-high);
  font-weight: 600;
  font-size: 0.95rem;
}

.page-about .about-timeline__description {
  display: block;
  padding: 0 1.1rem 0;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.page-about .about-timeline__item[open] .about-timeline__head {
  border-bottom: 1px solid var(--border);
}

.page-about .about-timeline__item[open] .about-timeline__description {
  color: var(--text-muted);
}

.page-about .about-timeline__desc {
  margin: 0;
  padding: 0 1.1rem 1.1rem;
  color: var(--text-muted);
  line-height: 1.7;
  font-size: 0.92rem;
}

/* ===== 数据能力 ===== */
.page-about .about-data__intro {
  color: var(--text-muted);
  line-height: 1.8;
  margin: 0 0 1.5rem;
}

.page-about .about-data {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.page-about .about-data__item {
  background: var(--bg-card);
  border: 2px solid var(--border);
  padding: 1.4rem 0.75rem 1.1rem;
  text-align: center;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.25);
}

.page-about .about-data__num {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  line-height: 1;
  color: var(--text-high);
}

.page-about .about-data__suffix {
  font-size: 0.5em;
  margin-left: 0.08em;
  color: inherit;
}

.page-about .about-data__label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-top: 0.5rem;
}

.page-about .about-data__item--lime {
  background: var(--accent-lime);
  border-color: var(--accent-lime);
}

.page-about .about-data__item--lime .about-data__num,
.page-about .about-data__item--lime .about-data__label {
  color: var(--bg-deep);
}

.page-about .about-data__item--orange {
  border-color: var(--accent-orange);
}

.page-about .about-data__item--orange .about-data__num {
  color: var(--accent-orange);
}

/* ===== 团队构成 ===== */
.page-about .about-team {
  display: grid;
  gap: 1.5rem;
  align-items: center;
}

.page-about .about-team__content p {
  color: var(--text-muted);
  line-height: 1.85;
  margin: 0 0 1rem;
}

.page-about .about-team__content strong {
  color: var(--text-high);
}

.page-about .about-team__roles {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  border-top: 2px solid var(--border);
}

.page-about .about-team__roles li {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-high);
  font-size: 0.95rem;
}

.page-about .about-team__role-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-orange);
  min-width: 5.8rem;
  font-size: 0.88rem;
}

.page-about .about-team__figure {
  position: relative;
  margin: 0;
}

.page-about .about-team__figure::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 2px solid var(--accent-orange);
  transform: translate(-10px, 10px);
  z-index: 0;
  pointer-events: none;
}

.page-about .about-team__figure img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--border);
  box-shadow: var(--shadow-hard);
}

/* ===== 服务承诺 ===== */
.page-about .about-commit {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-commit__item {
  display: flex;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent-lime);
  padding: 1.1rem 1.2rem;
}

.page-about .about-commit__index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--accent-lime);
  line-height: 1.6;
}

.page-about .about-commit__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-high);
  margin: 0 0 0.35rem;
}

.page-about .about-commit__body p {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0;
}

/* ===== 底部 CTA ===== */
.page-about .about-next {
  margin-top: 3rem;
  border: 2px solid var(--accent-lime);
  background:
    linear-gradient(120deg, rgba(198, 255, 0, 0.08), transparent 60%),
    var(--bg-card);
  padding: 1.8rem 1.4rem;
  text-align: center;
  box-shadow: var(--shadow-hard);
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 1.1rem;
  color: var(--text-high);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  justify-content: center;
}

/* ===== 桌面增强 ===== */
@media (min-width: 820px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .about-hero__title {
    font-size: clamp(3rem, 7vw, 5.8rem);
  }

  .page-about .about-data {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.1rem;
  }

  .page-about .about-team {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

  .page-about .about-commit {
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 230px 1fr;
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 7rem;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0.15rem;
    overflow: visible;
  }

  .page-about .about-toc__link {
    white-space: normal;
    border: none;
    border-bottom: 1px solid var(--border);
    padding: 0.55rem 0;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    border-color: var(--accent-lime);
  }

  .page-about .about-timeline {
    border-left: none;
    padding-left: 0;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.8rem;
    position: relative;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: 25px;
    left: 3%;
    right: 3%;
    height: 2px;
    background: var(--border);
    z-index: 0;
  }

  .page-about .about-timeline__item {
    position: relative;
    z-index: 1;
    margin: 0;
  }

  .page-about .about-timeline__head {
    min-height: 50px;
    align-items: flex-start;
    flex-direction: column;
    gap: 0.35rem;
    padding: 0.7rem 0.9rem 0.6rem;
  }

  .page-about .about-timeline__head::before {
    width: 12px;
    height: 12px;
    background: var(--accent-lime);
    box-shadow: 0 0 0 2px var(--accent-lime);
    margin-right: 0;
  }

  .page-about .about-timeline__year {
    font-size: 1.4rem;
  }

  .page-about .about-timeline__desc {
    padding: 0.6rem 0.9rem 0.9rem;
  }
}