/* SEO 落地页专用样式 */

.seo-hero {
  background:
    radial-gradient(ellipse at top, rgba(200, 149, 109, 0.15) 0%, transparent 50%),
    var(--bg);
  padding: 140px 0 80px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.seo-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4.5vw, 52px);
  font-weight: 600;
  line-height: 1.2;
  color: var(--cream);
  margin: 16px 0 24px;
  letter-spacing: -0.01em;
}
.seo-sub {
  font-size: clamp(15px, 1.4vw, 18px);
  color: var(--white-60);
  margin-bottom: 12px;
}
.seo-keyline {
  font-size: 14px;
  color: var(--white-60);
  margin-bottom: 32px;
}
.seo-keyline strong {
  color: var(--warm);
  font-weight: 500;
}

.breadcrumb {
  font-size: 12px;
  color: var(--white-60);
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}
.breadcrumb a {
  color: var(--warm);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.breadcrumb a:hover { color: var(--cream); }
.bc-sep { margin: 0 8px; opacity: 0.5; }

/* ====== 定义区 ====== */
.seo-def {
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
}
.seo-def h2 {
  font-family: var(--font-serif);
  font-size: clamp(24px, 3vw, 36px);
  color: var(--cream);
  margin-bottom: 24px;
  font-weight: 600;
}
.seo-def p {
  font-size: 16px;
  color: var(--white-60);
  line-height: 1.85;
  max-width: 920px;
  margin: 0 auto 16px;
}
.seo-def strong { color: var(--amber); font-weight: 500; }

/* ====== 服务矩阵 ====== */
.seo-services {
  background: var(--bg);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.service-card {
  display: block;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 32px 28px;
  text-decoration: none;
  transition: all 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--warm), transparent);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}
.service-card:hover {
  background: var(--bg-3);
  border-color: var(--warm);
  transform: translateY(-4px);
}
.service-card:hover::before { opacity: 1; }

.service-num {
  font-family: var(--font-serif);
  font-size: 40px;
  color: var(--warm);
  font-weight: 500;
  opacity: 0.4;
  margin-bottom: 12px;
  font-style: italic;
}
.service-card h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--cream);
  margin-bottom: 12px;
  font-weight: 600;
}
.service-card > p {
  font-size: 14px;
  color: var(--white-60);
  line-height: 1.6;
  margin-bottom: 16px;
}
.service-case {
  font-size: 12px;
  color: var(--amber);
  font-style: italic;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

/* ====== 区域矩阵 ====== */
.seo-areas {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
}
.areas-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 48px;
}
.area-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px 20px;
  transition: all 0.3s var(--ease);
}
.area-card:hover {
  border-color: var(--warm);
  background: var(--bg-3);
}
.area-card h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--cream);
  margin-bottom: 12px;
  font-weight: 600;
}
.area-card p {
  font-size: 13px;
  color: var(--white-60);
  line-height: 1.6;
  margin-bottom: 4px;
}
.area-card p:last-child { margin-bottom: 0; }

/* ====== FAQ ====== */
.seo-faq {
  background: var(--bg);
  border-top: 1px solid var(--border);
}
.faq-item {
  margin-top: 16px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.3s var(--ease);
  overflow: hidden;
}
.faq-item[open] {
  border-color: var(--warm);
  background: var(--bg-3);
}
.faq-item summary {
  cursor: pointer;
  padding: 20px 28px;
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--cream);
  font-weight: 500;
  list-style: none;
  position: relative;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 28px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--warm);
  font-size: 24px;
  font-weight: 300;
  transition: transform 0.3s var(--ease);
}
.faq-item[open] summary::after { content: '−'; }
.faq-item summary:hover { color: var(--amber); }
.faq-body {
  padding: 0 28px 24px;
  font-size: 15px;
  color: var(--white-60);
  line-height: 1.8;
}
.faq-body p { margin-bottom: 12px; }
.faq-body ul, .faq-body ol { margin-left: 24px; margin-bottom: 12px; }
.faq-body li { margin-bottom: 8px; }
.faq-body strong { color: var(--amber); font-weight: 500; }

/* ====== 数据证明 ====== */
.seo-data {
  background:
    radial-gradient(ellipse at center, rgba(200, 149, 109, 0.10) 0%, transparent 60%),
    var(--bg-2);
  border-top: 1px solid var(--border);
}
.data-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.data-item {
  text-align: center;
  padding: 32px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.data-num {
  font-family: var(--font-serif);
  font-size: 56px;
  font-weight: 600;
  color: var(--warm);
  line-height: 1;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.data-label {
  font-size: 13px;
  color: var(--white-60);
  letter-spacing: 0.08em;
}

/* ====== 内部链接 ====== */
.seo-links {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
}
.seo-related {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 32px;
}
.seo-related li {
  font-size: 14px;
  color: var(--white-60);
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
}
.seo-related a {
  color: var(--cream);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.seo-related a:hover { color: var(--amber); }

.seo-cta-tip {
  margin-top: 24px;
  font-size: 13px;
  color: var(--white-60);
  letter-spacing: 0.05em;
}

/* ====== 响应式 ====== */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .areas-grid { grid-template-columns: repeat(2, 1fr); }
  .data-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .services-grid { grid-template-columns: 1fr; }
  .areas-grid { grid-template-columns: 1fr; }
  .data-grid { grid-template-columns: 1fr; }
  .seo-related { grid-template-columns: 1fr; }
  .data-num { font-size: 40px; }
}