/* ============================================
   首页 · 关于优课典预览(方案 C:横条数据 + 引言)
   保留原板块 1 的浅橙渐变背景, 只换内容
   ============================================ */

.about-preview-section {
  padding: 88px 24px 96px;
  background: linear-gradient(180deg, #FFFDF8 0%, #FFF6EA 100%);
}

.about-preview-section .section-head {
  margin-bottom: 48px;
}

.about-preview {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* ===== 横条数据卡 ===== */
.about-preview-stats {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 8px;
  background: #FFFFFF;
  border-radius: 20px;
  padding: 32px 28px;
  border: 1px solid rgba(255, 168, 76, 0.15);
  box-shadow: 0 16px 40px -20px rgba(255, 132, 34, 0.2),
              0 4px 12px -6px rgba(0, 0, 0, 0.04);
  position: relative;
  overflow: hidden;
}

.about-preview-stats::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 168, 76, 0.15), transparent 70%);
  pointer-events: none;
}

.stat-item {
  flex: 1;
  text-align: center;
  padding: 0 8px;
  position: relative;
  z-index: 1;
  transition: transform 0.3s;
}

.stat-item:hover {
  transform: translateY(-3px);
}

.stat-num {
  font-size: 28px;
  font-weight: 800;
  color: #FF8422;
  line-height: 1.2;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #FF8422 0%, #FFA84C 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 13.5px;
  color: #4A4A4A;
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  align-self: center;
  height: 36px;
  background: linear-gradient(180deg, transparent, rgba(255, 168, 76, 0.3), transparent);
  flex-shrink: 0;
}

/* ===== 家长引言 ===== */
.about-preview-quote {
  position: relative;
  padding: 32px 40px 26px 60px;
  background: linear-gradient(135deg, rgba(255, 132, 34, 0.05) 0%, rgba(255, 168, 76, 0.09) 100%);
  border-radius: 20px;
  border-left: 4px solid #FF8422;
}

.apq-mark {
  position: absolute;
  top: 12px;
  left: 20px;
  font-family: 'Georgia', serif;
  font-size: 64px;
  color: rgba(255, 132, 34, 0.35);
  line-height: 0.6;
  font-weight: 700;
}

.about-preview-quote p {
  margin: 0 0 12px;
  font-size: 17px;
  line-height: 1.85;
  color: #1F1F1F;
  font-weight: 500;
}

.apq-source {
  color: #FF8422;
  font-size: 13.5px;
  font-weight: 500;
  text-align: right;
  letter-spacing: 0.5px;
}

/* ===== CTA ===== */
.about-preview-cta {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 4px;
}

.about-preview-cta .btn-primary {
  background: linear-gradient(135deg, #FF8422 0%, #FFA84C 100%);
  color: #FFFFFF;
  border: none;
  box-shadow: 0 10px 24px -8px rgba(255, 132, 34, 0.5);
}

.about-preview-cta .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -8px rgba(255, 132, 34, 0.6);
  background: linear-gradient(135deg, #E86A00 0%, #FF8422 100%);
}

.about-preview-cta .btn-ghost {
  background: #FFFFFF;
  border: 1.5px solid #FF8422;
  color: #FF8422;
  font-weight: 600;
}

.about-preview-cta .btn-ghost:hover {
  background: #FFF5E8;
  color: #E86A00;
  transform: translateY(-2px);
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .about-preview-section { padding: 64px 20px 72px; }
  .about-preview-stats {
    flex-direction: column;
    gap: 20px;
    padding: 24px;
  }
  .stat-divider {
    width: 60%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 168, 76, 0.3), transparent);
    margin: 0 auto;
  }
  .about-preview-quote {
    padding: 24px 24px 20px 40px;
  }
  .apq-mark { font-size: 48px; left: 12px; }
  .about-preview-quote p { font-size: 15.5px; }
}

@media (max-width: 560px) {
  .stat-num { font-size: 24px; }
  .stat-label { font-size: 13px; }
  .about-preview-cta { flex-direction: column; }
  .about-preview-cta .btn { width: 100%; }
}

/* ============================================
   板块 2 · 图文并排 (平台优势 + 家长口碑)
   保留粒子背景 + 动画,只重设内容排版
   ============================================ */

.brand-particles-section .container {
  max-width: 1100px;
}

.brand-particles-section .section-head {
  margin-bottom: 48px;
}

/* 每个图文并排块 */
.about-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: center;
  margin-bottom: 56px;
}

.about-split:last-of-type {
  margin-bottom: 32px;
}

/* 反向:图在右 */
.about-split.about-split-reverse .about-split-media {
  order: 2;
}

.about-split.about-split-reverse .about-split-text {
  order: 1;
}

/* 图片区 */
.about-split-media {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  box-shadow:
    0 24px 60px -24px rgba(255, 132, 34, 0.35),
    0 8px 20px -8px rgba(0, 0, 0, 0.08);
}

.about-split-media img {
  display: block;
  width: 100%;
  height: 380px;
  object-fit: cover;
}

.about-split-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 132, 34, 0.15) 0%, rgba(0, 0, 0, 0.08) 100%);
  pointer-events: none;
}

.about-split-badge {
  position: absolute;
  bottom: 20px;
  left: 20px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 2;
  box-shadow: 0 12px 30px -12px rgba(0, 0, 0, 0.2);
}

.about-split-badge .badge-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #FF8422 0%, #FFA84C 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.about-split-badge strong {
  display: block;
  font-size: 14px;
  color: #1F1F1F;
  font-weight: 700;
}

.about-split-badge span {
  display: block;
  font-size: 12px;
  color: #666;
}

/* 文本区 */
.about-split-text {
  padding: 8px 0;
}

.about-split-eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  color: #FF8422;
  letter-spacing: 2px;
  font-weight: 600;
}

.about-split-title {
  margin: 0 0 24px;
  font-size: 24px;
  font-weight: 700;
  color: #1F1F1F;
  line-height: 1.4;
}

/* 4 优势 bullets */
.about-split-bullets {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.about-split-bullets li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.bullet-mark {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, #FF8422 0%, #FFA84C 100%);
  color: #FFFFFF;
  font-family: 'Georgia', serif;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 14px -6px rgba(255, 132, 34, 0.5);
}

.about-split-bullets li > div strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15.5px;
  font-weight: 600;
  color: #1F1F1F;
}

.about-split-bullets li > div span {
  display: block;
  color: #4A4A4A;
  font-size: 14px;
  line-height: 1.75;
}

/* 家长口碑 3 卡 */
.about-testi-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.about-testi-card {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid rgba(255, 168, 76, 0.2);
  display: flex;
  gap: 14px;
  transition: transform 0.3s, box-shadow 0.3s;
}

.about-testi-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px -14px rgba(255, 132, 34, 0.35);
  border-color: rgba(255, 132, 34, 0.35);
}

.testi-avatar {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #FF8422 0%, #FFA84C 100%);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  box-shadow: 0 6px 14px -6px rgba(255, 132, 34, 0.5);
}

.testi-body {
  flex: 1;
  min-width: 0;
}

.testi-body p {
  margin: 0 0 8px;
  color: #333;
  font-size: 13.5px;
  line-height: 1.75;
  font-style: italic;
}

.testi-source {
  display: block;
  color: #FF8422;
  font-size: 12px;
  font-weight: 500;
}

/* 底部行内 CTA */
.about-inline-cta {
  text-align: center;
  margin-top: 8px;
}

.about-inline-cta a {
  display: inline-block;
  padding: 10px 22px;
  color: #FF8422;
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid #FF8422;
  transition: all 0.25s;
}

.about-inline-cta a:hover {
  color: #E86A00;
  transform: translateX(4px);
  border-bottom-color: #E86A00;
}

/* 响应式 */
@media (max-width: 900px) {
  .about-split {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 40px;
  }
  .about-split.about-split-reverse .about-split-media {
    order: 1;
  }
  .about-split.about-split-reverse .about-split-text {
    order: 2;
  }
  .about-split-media img {
    height: 260px;
  }
  .about-split-title {
    font-size: 20px;
  }
}

@media (max-width: 560px) {
  .about-split-media img { height: 200px; }
  .about-split-badge { bottom: 12px; left: 12px; padding: 10px 14px; }
  .about-split-badge .badge-icon { width: 32px; height: 32px; font-size: 16px; }
  .about-split-title { font-size: 18px; }
  .about-split-bullets li { gap: 12px; }
  .bullet-mark { width: 28px; height: 28px; font-size: 11px; }
}