/* ===== 品牌档案页 page-about 专属样式 ===== */

.page-about {
  --timeline-node-center: 19px;
  --timeline-diamond-size: 14px;
  --timeline-line-width: 2px;
  position: relative;
  overflow: hidden;
  background: var(--color-bg);
  color: var(--color-text);
}

/* 面包屑 */
.page-about .breadcrumb {
  padding-top: 1.25rem;
}

.page-about .breadcrumb-sep {
  margin: 0 0.5rem;
  color: var(--color-muted);
}

/* ---------- Hero 海报区 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 2rem 0 3rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  top: -18%;
  width: 60%;
  height: 130%;
  background: linear-gradient(155deg, var(--color-secondary) 0%, transparent 72%);
  clip-path: polygon(22% 0, 100% 0, 82% 100%, 0 100%);
  opacity: 0.22;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--color-border) 30%, var(--color-primary) 65%, transparent 100%);
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

.page-about .about-hero-copy {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-copy .badge {
  display: inline-block;
  background: var(--color-secondary);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.3rem 0.9rem;
  border-left: 3px solid var(--color-primary);
  margin-bottom: 1.25rem;
}

.page-about .about-hero-copy h1 {
  font-family: var(--font-heading);
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: 1.12;
  color: var(--color-primary);
  margin: 0 0 1.25rem;
}

.page-about .about-hero-copy .lead {
  font-size: 1.0625rem;
  line-height: var(--line-height-body);
  color: var(--color-text);
  max-width: 48ch;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero-visual {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-note {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-muted);
  writing-mode: vertical-rl;
  position: absolute;
  right: 0.5rem;
  top: 1rem;
  z-index: 2;
  text-transform: uppercase;
}

.page-about .about-hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  background: var(--color-surface);
  clip-path: polygon(0 0, 100% 7%, 100% 100%, 0 93%);
}

/* ---------- Quick Start 使命 ---------- */
.page-about .about-mission {
  padding: 3rem 0 3.5rem;
}

.page-about .section-heading {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.page-about .section-mark {
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  background: var(--color-accent);
}

.page-about .section-heading h2 {
  font-family: var(--font-heading);
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.2;
  color: var(--color-primary);
  margin: 0;
}

.page-about .about-mission-intro {
  font-size: 1.0625rem;
  line-height: var(--line-height-body);
  color: var(--color-text);
  max-width: 62ch;
  margin: 0 0 2rem;
  padding-left: 1rem;
  border-left: 3px solid var(--color-primary);
}

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

.page-about .about-mission-card {
  position: relative;
  background: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  padding: 1.5rem 1.5rem 1.5rem 1.75rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .about-mission-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
  border-left-color: var(--color-highlight);
}

.page-about .about-mission-index {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--fs-h3);
  font-weight: 900;
  line-height: 1;
  color: var(--color-highlight);
  margin-bottom: 0.75rem;
}

.page-about .about-mission-card h3 {
  font-family: var(--font-heading);
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 0.5rem;
}

.page-about .about-mission-card p {
  font-size: var(--fs-small);
  line-height: var(--line-height-body);
  color: var(--color-muted);
  margin: 0;
}

/* ---------- 发展轨迹 ---------- */
.page-about .about-timeline-section {
  padding: 3rem 0 3.5rem;
  background:
    linear-gradient(180deg, transparent 0%, rgba(139, 0, 0, 0.08) 30%, transparent 100%),
    var(--color-surface);
}

.page-about .about-timeline-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 3rem;
  padding-bottom: 2.5rem;
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: calc(var(--timeline-node-center) - 7px);
  top: 0.35rem;
  width: var(--timeline-diamond-size);
  height: var(--timeline-diamond-size);
  background: linear-gradient(135deg, var(--color-primary), var(--color-highlight));
  transform: rotate(45deg);
  border: 2px solid var(--color-bg);
  box-shadow: 0 0 0 1px var(--color-primary);
  z-index: 1;
}

.page-about .about-timeline-item::after {
  content: "";
  position: absolute;
  left: calc(var(--timeline-node-center) - 1px);
  top: 1.65rem;
  bottom: -0.25rem;
  width: var(--timeline-line-width);
  background: var(--color-border);
}

.page-about .about-timeline-item:last-child::after {
  display: none;
}

.page-about .about-timeline-item h3 {
  font-family: var(--font-heading);
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 0.5rem;
  transition: color 0.2s ease;
}

.page-about .about-timeline-item:hover h3 {
  color: var(--color-highlight);
}

.page-about .about-timeline-item p {
  font-size: var(--fs-small);
  line-height: var(--line-height-body);
  color: var(--color-text);
  margin: 0;
}

.page-about .about-timeline-visual {
  display: block;
}

.page-about .about-timeline-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 220px;
  background: var(--color-bg);
}

/* ---------- 平台数据 ---------- */
.page-about .about-stats {
  padding: 3rem 0 3.5rem;
}

.page-about .about-stats-banner {
  position: relative;
  overflow: hidden;
  min-height: 320px;
}

.page-about .about-stats-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.page-about .about-stats-content {
  position: relative;
  z-index: 1;
  padding: 2rem 1.5rem;
  background: linear-gradient(135deg, rgba(26, 10, 14, 0.92) 0%, rgba(26, 10, 14, 0.78) 100%);
}

.page-about .about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.page-about .about-stat-card {
  background: var(--color-bg);
  padding: 1.25rem 1rem;
  text-align: center;
  transition: background 0.2s ease;
}

.page-about .about-stat-card:hover {
  background: var(--color-surface);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--fs-h3);
  font-weight: 900;
  line-height: 1.2;
  color: var(--color-primary);
  transition: color 0.2s ease;
}

.page-about .about-stat-card:hover .about-stat-num {
  color: var(--color-highlight);
}

.page-about .about-stat-label {
  display: block;
  font-size: var(--fs-small);
  color: var(--color-muted);
  margin-top: 0.375rem;
  line-height: 1.4;
}

/* ---------- 服务承诺 ---------- */
.page-about .about-commit {
  padding: 3rem 0 3.5rem;
  background:
    linear-gradient(0deg, transparent 0%, rgba(27, 77, 62, 0.06) 40%, transparent 100%),
    var(--color-bg);
}

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

.page-about .about-commit-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-secondary);
  padding: 1.5rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-commit-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-primary);
  border-top-color: var(--color-highlight);
}

.page-about .about-commit-card h3 {
  font-family: var(--font-heading);
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 0.75rem;
}

.page-about .about-commit-card p {
  font-size: var(--fs-small);
  line-height: var(--line-height-body);
  color: var(--color-text);
  margin: 0;
}

.page-about .about-commit-footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.page-about .about-commit-footer p {
  font-size: var(--fs-small);
  color: var(--color-muted);
  margin: 0;
}

.page-about .about-commit-footer a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-commit-footer a:hover {
  color: var(--color-highlight);
}

/* ---------- 桌面端布局 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 3.5rem 0 5rem;
  }

  .page-about .about-hero-inner {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
  }

  .page-about .about-hero-copy h1 {
    font-size: calc(var(--fs-display) + 0.5rem);
  }

  .page-about .about-mission-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-timeline-layout {
    grid-template-columns: 1fr 220px;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-timeline-img {
    max-width: 220px;
  }

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

  .page-about .about-stats-content {
    padding: 2.5rem 2.5rem;
  }

  .page-about .about-stat-num {
    font-size: var(--fs-h2);
  }

  .page-about .about-commit-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

/* ---------- 大桌面增强 ---------- */
@media (min-width: 1200px) {
  .page-about .about-hero-copy .lead {
    font-size: 1.125rem;
  }

  .page-about .about-commit-card {
    padding: 1.75rem;
  }
}

.page-about {
  --line-height-body: 1.6;
}