/* ============ 品牌概况页专属样式 ============ */
.page-about {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  overflow-wrap: break-word;
}

/* ---- 顶部框景横幅 ---- */
.page-about .about-hero {
  position: relative;
  padding: 2rem 1.25rem 2.5rem;
  background: var(--surface-deep);
  border-bottom: 1px solid var(--border);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(201, 168, 106, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 168, 106, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 1.25rem;
  bottom: 1.5rem;
  width: 52px;
  height: 52px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  pointer-events: none;
}

.page-about .about-hero-index {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  z-index: 2;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--accent);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem 1.25rem 1.5rem;
  border: 1px solid rgba(201, 168, 106, 0.22);
  background: rgba(8, 20, 38, 0.6);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .about-hero-copy h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  line-height: 1.2;
  margin: 0.75rem 0 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-hero-lead {
  color: var(--text-2);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 56ch;
  margin: 0;
}

.page-about .about-hero-extra {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.page-about .about-hero-vertical {
  color: var(--accent);
  justify-self: end;
  align-self: end;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
}

/* ---- 主体布局 ---- */
.page-about .about-layout {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

/* 左侧章节索引，桌面显示 */
.page-about .about-index {
  display: none;
}

.page-about .about-index-inner {
  position: sticky;
  top: calc(var(--header-h) + 2rem);
  border-left: 1px solid var(--border);
  padding-left: 1.5rem;
}

.page-about .about-index-kicker {
  color: var(--text-2);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.page-about .about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.9rem;
  line-height: 1.4;
  transition: color 0.25s ease;
}

.page-about .about-index-list a span {
  color: var(--accent);
  font-size: 0.75rem;
}

.page-about .about-index-list a:hover {
  color: var(--accent-2);
}

.page-about .about-index-note {
  margin-top: 1.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(201, 168, 106, 0.2);
  color: var(--text-2);
  font-size: 0.8rem;
}

/* ---- 内容区 ---- */
.page-about .about-content {
  display: flex;
  flex-direction: column;
  gap: 4rem;
}

.page-about .about-section {
  position: relative;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.page-about .about-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid rgba(201, 168, 106, 0.3);
  padding-bottom: 0.75rem;
  margin-bottom: 1.75rem;
}

.page-about .about-section-head h2 {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  line-height: 1.3;
  margin: 0;
  position: relative;
  padding-left: 0.75rem;
}

.page-about .about-section-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.1em;
  bottom: 0.1em;
  width: 3px;
  background: var(--accent);
}

.page-about .about-en-note {
  color: var(--accent);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  white-space: nowrap;
}

/* ---- 01 品牌简介 ---- */
.page-about .about-intro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .about-intro-copy p {
  color: var(--text-2);
  line-height: 1.75;
  margin: 0 0 1rem;
}

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

.page-about .about-intro-figure {
  margin: 0;
}

.page-about .about-intro-figure .image-frame {
  border-color: var(--border);
  background: var(--surface);
}

.page-about .about-intro-figure figcaption {
  margin-top: 0.5rem;
  color: var(--text-2);
  font-size: 0.8rem;
  text-align: right;
  letter-spacing: 0.08em;
}

/* ---- 02 发展历程 ---- */
.page-about .about-timeline-wrap {
  position: relative;
}

.page-about .about-timeline-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: var(--surface-deep);
  border: none;
}

.page-about .about-timeline-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.28;
  filter: saturate(0.65);
}

.page-about .about-timeline-list {
  list-style: none;
  margin: 0;
  padding: 1rem 0 0;
  position: relative;
  z-index: 1;
}

.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 1.5rem;
  bottom: 1.5rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), rgba(201, 168, 106, 0.15));
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 2rem 2.5rem;
  transition: transform 0.25s ease;
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-item::after {
  content: "";
  position: absolute;
  left: 20px;
  top: 0.95rem;
  width: 16px;
  height: 1px;
  background: var(--accent);
  opacity: 0.7;
}

.page-about .timeline-dot {
  position: absolute;
  left: 0;
  top: 0.3rem;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 0 rgba(201, 168, 106, 0);
  transition: box-shadow 0.3s ease, background 0.3s ease;
}

.page-about .timeline-item:hover .timeline-dot {
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(201, 168, 106, 0.15);
}

.page-about .timeline-item:hover {
  transform: translateX(4px);
}

.page-about .timeline-year {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-2);
  letter-spacing: 0.06em;
  line-height: 1.2;
}

.page-about .timeline-content {
  margin-top: 0.3rem;
  max-width: 52ch;
}

.page-about .timeline-content h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin: 0 0 0.4rem;
  color: var(--text);
}

.page-about .timeline-content p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ---- 03 规模数字 ---- */
.page-about .about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about .about-stat-cell {
  border: 1px solid rgba(201, 168, 106, 0.25);
  background: var(--surface);
  padding: 1.25rem 1rem;
  position: relative;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .about-stat-cell:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.page-about .about-stat-label {
  display: block;
  color: var(--text-2);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.page-about .about-stat-number {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.1;
  color: var(--accent-2);
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.page-about .about-stat-desc {
  display: block;
  color: var(--text-2);
  font-size: 0.8rem;
  line-height: 1.5;
}

/* ---- 04 资质与认证 ---- */
.page-about .about-cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-cert-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about .about-cert-item {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  background: var(--surface);
  padding: 1.5rem;
  transition: background 0.25s ease;
}

.page-about .about-cert-item:hover {
  background: var(--surface-deep);
}

.page-about .about-cert-item h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  margin: 0.75rem 0 0.5rem;
  line-height: 1.35;
}

.page-about .about-cert-item p {
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

.page-about .about-cert-figure {
  margin: 0;
}

.page-about .about-cert-figure .image-frame {
  border-color: var(--border);
}

.page-about .about-cert-figure figcaption {
  margin-top: 0.5rem;
  color: var(--text-2);
  font-size: 0.8rem;
  text-align: right;
}

/* ---- 05 合作与生态 ---- */
.page-about .about-partner-lead {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-2);
  margin: 0 0 2rem;
  max-width: 60ch;
  padding-left: 0.75rem;
  border-left: 2px solid var(--accent);
}

.page-about .about-partner-list {
  display: flex;
  flex-direction: column;
}

.page-about .about-partner-row {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px dashed rgba(201, 168, 106, 0.35);
}

.page-about .about-partner-row:first-child {
  border-top: 1px dashed rgba(201, 168, 106, 0.35);
}

.page-about .about-partner-row:hover {
  background: rgba(18, 42, 74, 0.35);
}

.page-about .about-partner-num {
  font-family: var(--font-serif);
  color: var(--accent);
  font-size: 1.4rem;
  line-height: 1.2;
}

.page-about .about-partner-info h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin: 0 0 0.35rem;
}

.page-about .about-partner-info p {
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

/* ---- 底部行动区 ---- */
.page-about .about-cta {
  margin-top: 2.5rem;
  padding: 1.75rem;
  background: var(--surface-deep);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}

.page-about .about-cta-text strong {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--text);
}

.page-about .about-cta-text p {
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0.4rem 0 0;
}

/* ---- 平板 ---- */
@media (min-width: 768px) {
  .page-about .about-stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about .about-partner-row {
    grid-template-columns: 6rem 1fr;
  }

  .page-about .about-cta {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
  }

  .page-about .about-cta-text {
    margin-right: auto;
    max-width: 48ch;
  }
}

/* ---- 桌面 ---- */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 3rem 2rem 3.5rem;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 2rem;
    padding: 3rem 3rem 2.5rem;
  }

  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 3.5rem;
    padding: 3rem 2rem 5rem;
  }

  .page-about .about-index {
    display: block;
  }

  .page-about .about-content {
    gap: 5rem;
  }

  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 3rem;
  }

  .page-about .about-intro-figure {
    margin-top: 0.75rem;
  }

  .page-about .about-stat-cell {
    padding: 1.5rem 1.25rem;
  }

  .page-about .about-cert-grid {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-cert-figure {
    margin-top: 1.75rem;
  }

  .page-about .about-partner-row {
    grid-template-columns: 8rem 1fr;
    gap: 2rem;
    padding: 1.5rem 0;
  }

  .page-about .about-partner-num {
    font-size: 2rem;
  }

  .page-about .about-cta {
    flex-wrap: nowrap;
  }
}