/* ============ 品牌档案页面 ============ */
.page-about {
  --about-dark: #0B1B3A;
  --about-dark-raised: #10203F;
  --about-light: #F4F6FA;
  --about-card: #FFFFFF;
  --about-line-soft: rgba(255,255,255,0.12);
  --about-line-ink: rgba(11,27,58,0.08);
  --about-satin-dark: repeating-linear-gradient(135deg, rgba(255,255,255,0.045) 0px, rgba(255,255,255,0.045) 1px, transparent 1px, transparent 14px);
  --about-satin-light: repeating-linear-gradient(135deg, rgba(11,27,58,0.03) 0px, rgba(11,27,58,0.03) 1px, transparent 1px, transparent 14px);
  position: relative;
  min-height: 100vh;
  background: var(--about-light);
  color: var(--c-text-dark);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
}

/* 左侧品牌条 — 移动端隐藏 */
.about-rail {
  display: none;
}

.about-sheet {
  width: 100%;
}

/* ============ 封面区 ============ */
.about-cover {
  position: relative;
  overflow: hidden;
  padding: 48px 20px 72px;
  background: var(--about-dark);
  background-image: var(--about-satin-dark);
  color: var(--c-white);
}
.about-cover::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-accent) 62%, var(--c-accent-warm) 62%, var(--c-accent-warm) 100%);
  z-index: 2;
}
.about-cover__inner {
  max-width: var(--container);
  margin: 0 auto;
}
.about-cover .breadcrumb {
  margin-bottom: 48px;
  color: var(--c-muted);
  font-size: var(--fs-small);
}
.about-cover .breadcrumb a {
  color: var(--c-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}
.about-cover .breadcrumb a:hover {
  color: var(--c-accent);
}
.about-cover .breadcrumb__sep {
  margin: 0 8px;
  opacity: 0.5;
}
.about-cover__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.about-cover__eyebrow {
  margin: 0 0 16px;
  font-size: var(--fs-tiny);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-accent);
  font-weight: 700;
}
.about-cover h1 {
  margin: 0 0 20px;
  font-family: var(--font-heading);
  font-size: clamp(2.3rem, 6vw, var(--fs-hero));
  line-height: 1.12;
  letter-spacing: -0.015em;
  transform: skew(-5deg);
  font-weight: 800;
}
.about-cover__lead {
  margin: 0 0 28px;
  font-size: 1.05rem;
  color: var(--c-muted);
  max-width: 520px;
}
.about-cover__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 36px;
}
.about-cover__stat strong {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1;
  color: var(--c-accent);
}
.about-cover__stat span {
  font-size: var(--fs-tiny);
  color: var(--c-muted);
  letter-spacing: 0.08em;
}
.about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
}
.about-cover__story-link {
  color: var(--c-white);
  text-decoration: none;
  border-bottom: 1px solid var(--c-accent);
  padding-bottom: 4px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.about-cover__story-link span {
  display: inline-block;
  margin-left: 6px;
  transition: transform 0.25s ease;
}
.about-cover__story-link:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
}
.about-cover__story-link:hover span {
  transform: translateX(4px);
}
.about-cover__figure {
  margin: 0;
}
.about-cover__figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: 0 20px 40px rgba(0,0,0,0.25);
}
.about-cover__figure figcaption {
  margin-top: 12px;
  font-size: var(--fs-tiny);
  color: var(--c-muted);
  letter-spacing: 0.12em;
  text-align: right;
}

/* ============ 章节通用 ============ */
.about-chapter {
  position: relative;
  padding: 64px 20px 72px;
}
.about-chapter__inner {
  max-width: var(--container);
  margin: 0 auto;
}
.about-chapter__bar {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--c-accent) 0%, var(--c-accent-warm) 100%);
}
.about-chapter__head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
}
.about-chapter__number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  opacity: 0.14;
}
.about-chapter__head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.6vw, var(--fs-section-title));
  font-weight: 800;
  transform: skew(-5deg);
  letter-spacing: -0.01em;
}
.about-chapter__en {
  margin-left: auto;
  font-size: var(--fs-tiny);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-muted);
  font-weight: 700;
}

/* 浅色章节 */
.about-story,
.about-data {
  background: var(--about-light);
  color: var(--c-text-dark);
}
.about-story .about-chapter__bar,
.about-data .about-chapter__bar {
  background: linear-gradient(180deg, var(--about-dark) 0%, var(--c-accent) 100%);
}
.about-story .about-chapter__number,
.about-data .about-chapter__number {
  color: var(--about-dark);
  opacity: 0.15;
}
.about-story .about-chapter__en,
.about-data .about-chapter__en {
  color: rgba(26,26,46,0.45);
}

/* 深色章节 */
.about-milestones,
.about-local {
  background: var(--about-dark);
  background-image: var(--about-satin-dark);
  color: var(--c-white);
}
.about-milestones .about-chapter__bar,
.about-local .about-chapter__bar {
  background: linear-gradient(180deg, var(--c-accent) 0%, var(--c-accent-warm) 100%);
}
.about-milestones .about-chapter__number,
.about-local .about-chapter__number {
  color: var(--c-accent);
  opacity: 0.55;
}
.about-milestones .about-chapter__head h2,
.about-local .about-chapter__head h2 {
  color: var(--c-white);
}

/* ============ 品牌故事 ============ */
.about-story__body {
  max-width: 680px;
}
.about-story__intro {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--about-dark);
  font-weight: 500;
  margin-bottom: 22px;
}
.about-story__body p {
  margin-bottom: 18px;
  color: rgba(26,26,46,0.78);
}
.about-story__body p strong:not(.data-highlight) {
  color: var(--about-dark);
  font-weight: 800;
  background: linear-gradient(transparent 68%, rgba(0,230,118,0.35) 68%);
}
.about-story__body blockquote {
  margin: 28px 0;
  padding: 18px 0 18px 24px;
  border-left: 4px solid var(--c-accent);
  background: linear-gradient(90deg, rgba(0,230,118,0.08) 0%, transparent 80%);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--about-dark);
  line-height: 1.45;
  font-style: normal;
}

/* ============ 发展里程碑 ============ */
.about-timeline {
  position: relative;
  margin: 0 0 48px;
  padding: 8px 0 8px 36px;
  list-style: none;
}
.about-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-accent) 0%, rgba(0,230,118,0.15) 60%, var(--c-accent-warm) 100%);
}
.about-timeline__item {
  position: relative;
  margin-bottom: 28px;
}
.about-timeline__marker {
  position: absolute;
  left: -31px;
  top: 26px;
  width: 14px;
  height: 14px;
  background: var(--c-accent);
  border: 2px solid var(--about-dark);
  border-radius: 3px;
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px rgba(11,27,58,0.35), 0 0 14px var(--c-glow);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}
.about-timeline__item:hover .about-timeline__marker {
  background: var(--c-accent-warm);
  box-shadow: 0 0 0 3px rgba(11,27,58,0.35), 0 0 18px rgba(255,107,53,0.4);
}
.about-timeline__card {
  padding: 22px 24px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius-md);
  transition: border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}
.about-timeline__item:hover .about-timeline__card,
.about-timeline__item:focus-within .about-timeline__card {
  border-color: var(--c-accent);
  background: rgba(255,255,255,0.1);
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
.about-timeline__card .tag {
  display: inline-block;
  margin-bottom: 10px;
}
.about-timeline__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-white);
}
.about-timeline__card p {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--c-muted);
  line-height: 1.6;
}
.about-timeline__detail {
  max-height: 240px;
  opacity: 1;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

/* 支持悬停的设备上，详情默认收起 */
@media (hover: hover) {
  .about-timeline__detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top: none;
    transition: max-height 0.4s ease, opacity 0.3s ease, margin-top 0.3s ease;
  }
  .about-timeline__item:hover .about-timeline__detail,
  .about-timeline__item:focus-within .about-timeline__detail {
    max-height: 240px;
    opacity: 1;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid rgba(255,255,255,0.1);
  }
}

.about-milestones__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-line-soft);
}
.about-milestones__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.about-milestones__figure figcaption {
  padding: 10px 16px;
  font-size: var(--fs-tiny);
  color: var(--c-muted);
  background: rgba(255,255,255,0.05);
  letter-spacing: 0.1em;
}

/* ============ 数据能力 ============ */
.about-data__intro {
  max-width: 640px;
  margin: 0 0 36px;
  font-size: 1.05rem;
  color: var(--c-text-dark);
}
.about-data__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-bottom: 28px;
}
.about-data__card {
  position: relative;
  padding: 28px 24px 24px;
  border-radius: var(--radius-md);
  background: var(--about-card);
  border-left: 4px solid var(--c-accent);
  box-shadow: 0 8px 24px rgba(11,27,58,0.05);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.about-data__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(11,27,58,0.09);
}
.about-data__card .chapter-index {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--c-accent);
  line-height: 1;
}
.about-data__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--c-text-dark);
}
.about-data__card p {
  margin: 0;
  font-size: var(--fs-small);
  color: rgba(26,26,46,0.7);
  line-height: 1.65;
}
.about-data__note {
  padding: 18px 22px;
  background: rgba(11,27,58,0.05);
  border-radius: var(--radius-sm);
  font-size: var(--fs-small);
  color: var(--c-text-dark);
  line-height: 1.7;
}
.about-data__note a {
  color: var(--about-dark);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid var(--c-accent);
  transition: color 0.2s ease, border-bottom-color 0.2s ease;
}
.about-data__note a:hover {
  color: var(--c-accent);
  border-bottom-color: currentColor;
}

/* ============ 本地化支持 ============ */
.about-local__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.about-local__text {
  font-size: var(--fs-body);
  color: var(--c-muted);
}
.about-local__text > p {
  margin: 0 0 18px;
}
.about-local__list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  border-top: 1px solid var(--about-line-soft);
}
.about-local__list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line-soft);
  font-size: var(--fs-small);
  color: var(--c-white);
}
.about-local__item-label {
  flex-shrink: 0;
  min-width: 72px;
  font-size: var(--fs-tiny);
  letter-spacing: 0.1em;
  color: var(--c-accent);
  font-weight: 700;
  text-transform: uppercase;
}
.about-local__text a {
  color: var(--c-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(0,230,118,0.4);
  transition: border-bottom-color 0.2s ease, color 0.2s ease;
}
.about-local__text a:hover {
  color: var(--c-white);
  border-bottom-color: var(--c-white);
}
.about-local__compliance {
  padding: 16px 18px;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius-sm);
  font-size: var(--fs-tiny);
  color: var(--c-muted);
  border: 1px solid var(--about-line-soft);
}
.about-local__figure {
  margin: 0;
}
.about-local__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line-soft);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}
.about-local__figure figcaption {
  margin-top: 12px;
  font-size: var(--fs-tiny);
  color: var(--c-muted);
  text-align: right;
  letter-spacing: 0.1em;
}

/* ============ 平板增强 ============ */
@media (min-width: 768px) {
  .about-cover {
    padding: 64px 32px 88px;
  }
  .about-cover__grid {
    grid-template-columns: 1fr 300px;
    gap: 48px;
    align-items: center;
  }
  .about-cover__figure img {
    aspect-ratio: 3 / 4;
  }
  .about-chapter {
    padding: 80px 32px 88px;
  }
  .about-chapter__number {
    font-size: 4.2rem;
  }
  .about-timeline {
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
  }
  .about-data__cards {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
}

/* ============ 桌面端 ============ */
@media (min-width: 1024px) {
  .page-about {
    padding-left: 96px;
  }
  .about-rail {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: 96px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 28px 10px 24px;
    background: var(--about-dark);
    background-image: var(--about-satin-dark);
    border-right: 1px solid rgba(255,255,255,0.06);
    z-index: 100;
  }
  .about-rail__brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    text-decoration: none;
  }
  .about-rail__brand-mark {
    font-family: var(--font-heading);
    font-weight: 900;
    font-size: 1.6rem;
    line-height: 1;
    color: var(--c-accent);
    transform: skew(-5deg);
  }
  .about-rail__brand-word {
    font-size: var(--fs-tiny);
    letter-spacing: 0.2em;
    color: var(--c-muted);
    writing-mode: vertical-rl;
    margin-top: 6px;
  }
  .about-rail__nav {
    display: flex;
    flex-direction: column;
    gap: 18px;
  }
  .about-rail__link {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--c-muted);
    transition: color 0.2s ease;
  }
  .about-rail__dot {
    width: 8px;
    height: 8px;
    background: var(--c-muted);
    border-radius: 50%;
    transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  }
  .about-rail__label {
    font-size: var(--fs-tiny);
    letter-spacing: 0.1em;
  }
  .about-rail__link:hover,
  .about-rail__link:focus-visible {
    color: var(--c-accent);
  }
  .about-rail__link:hover .about-rail__dot,
  .about-rail__link:focus-visible .about-rail__dot {
    background: var(--c-accent);
    transform: scale(1.4);
    box-shadow: 0 0 10px var(--c-glow);
  }
  .about-rail__foot {
    writing-mode: vertical-rl;
    font-size: var(--fs-tiny);
    color: var(--c-muted);
    letter-spacing: 0.2em;
    margin: 0;
  }
  .about-cover {
    min-height: 640px;
    display: flex;
    align-items: center;
  }
  .about-cover__inner {
    width: 100%;
  }
  .about-cover__grid {
    grid-template-columns: 1fr 360px;
    gap: 64px;
  }
  .about-cover__lead {
    font-size: 1.125rem;
  }
  .about-local__grid {
    grid-template-columns: 1fr 400px;
    align-items: center;
  }
}