:root {
  --primary-500: #ff6f2c;
  --secondary-500: #0ea5e9;
  --dark-900: #0f172a;
  --dark-800: #1e293b;
  --dark-700: #334155;
  --dark-500: #64748b;
  --dark-100: #f1f5f9;
  --dark-50: #f8fafc;
}

/* 文章排版 */
.article-hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--dark-900);
}
.article-hero img.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.45;
}
.article-hero .hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(15, 23, 42, 0.3) 0%,
    rgba(15, 23, 42, 0.85) 100%
  );
}
.article-hero .hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 8rem 1rem 4rem;
  max-width: 800px;
}
.article-hero .hero-tag {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
  color: #fff;
  padding: 0.35rem 1.2rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}
.article-hero h1 {
  color: #fff;
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1.2rem;
}
.article-hero .hero-subtitle {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.15rem;
  line-height: 1.8;
}
.article-hero .hero-meta {
  margin-top: 2rem;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
}

/* 文章正文 */
.article-body {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  font-size: 1.1rem;
  line-height: 2;
  color: var(--dark-700);
}
.article-body h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--dark-900);
  margin: 3.5rem 0 1.5rem;
  padding-left: 1rem;
  border-left: 4px solid var(--primary-500);
}
.article-body h3 {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--dark-800);
  margin: 2.5rem 0 1rem;
}
.article-body p {
  margin-bottom: 1.5rem;
}
.article-body img.article-img {
  width: 100%;
  border-radius: 12px;
  margin: 2rem 0;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}
.article-body .img-caption {
  text-align: center;
  color: var(--dark-500);
  font-size: 0.9rem;
  margin-top: -1rem;
  margin-bottom: 2rem;
}

/* 高亮框 */
.highlight-box {
  background: linear-gradient(135deg, #fff5ed 0%, #f0f9ff 100%);
  border-left: 4px solid var(--primary-500);
  border-radius: 0 12px 12px 0;
  padding: 1.5rem 2rem;
  margin: 2rem 0;
}
.highlight-box strong {
  color: var(--primary-500);
}

/* 对比卡片 */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}
.compare-card {
  background: #fff;
  border-radius: 12px;
  padding: 1.8rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  border-top: 4px solid;
}
.compare-card.seo {
  border-color: var(--dark-500);
}
.compare-card.geo {
  border-color: var(--primary-500);
}
.compare-card h4 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}
.compare-card ul {
  list-style: none;
  padding: 0;
}
.compare-card ul li {
  padding: 0.4rem 0;
  font-size: 0.95rem;
  color: var(--dark-700);
}
.compare-card ul li::before {
  content: "→ ";
  color: var(--primary-500);
  font-weight: bold;
}

/* 策略编号卡片 */
.strategy-card {
  display: flex;
  gap: 1.2rem;
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.2rem 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  transition:
    transform 0.2s,
    box-shadow 0.2s;
}
.strategy-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}
.strategy-num {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
  color: #fff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 800;
}
.strategy-card h4 {
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
  color: var(--dark-900);
}
.strategy-card p {
  font-size: 0.95rem;
  color: var(--dark-500);
  margin: 0;
  line-height: 1.6;
}

/* 数据亮点 */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 2.5rem 0;
}
.stat-item {
  text-align: center;
  padding: 1.5rem;
  background: var(--dark-900);
  border-radius: 12px;
  color: #fff;
}
.stat-item .stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-item .stat-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 0.3rem;
}

/* 总结框 */
.summary-box {
  background: var(--dark-900);
  border-radius: 16px;
  padding: 2.5rem;
  margin: 3rem 0;
  color: #fff;
}
.summary-box h3 {
  color: #fff;
  margin-top: 0;
}
.summary-box ul {
  color: rgba(255, 255, 255, 0.8);
}
.summary-box ul li {
  padding: 0.5rem 0;
}

/* 底部导航 */
.article-footer {
  background: var(--dark-50);
  padding: 3rem 1.5rem;
  text-align: center;
  border-top: 1px solid var(--dark-200);
}

@media (max-width: 768px) {
  .article-hero h1 {
    font-size: 1.8rem;
  }
  .article-hero .hero-content {
    padding: 6rem 1rem 3rem;
  }
  .compare-grid {
    grid-template-columns: 1fr;
  }
  .stat-row {
    grid-template-columns: 1fr;
  }
  .article-body {
    font-size: 1rem;
    padding: 1rem 1rem;
  }
}