/* 磁力蜘蛛 - 冰晶极光风格 */
/* 独特视觉：浅蓝白渐变基底 + 青蓝/冰紫点缀 + 蛛网几何装饰 */

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background: linear-gradient(135deg, #f0f7ff 0%, #e8f0fe 50%, #f5f3ff 100%);
  color: #1a2a4a;
}

/* 核心布局 */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.section { padding: 80px 0; position: relative; }

.section:nth-child(even) { 
  background: linear-gradient(135deg, rgba(180, 210, 255, 0.12) 0%, rgba(200, 180, 255, 0.08) 100%);
}

/* 导航 */
.site-header { 
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; 
  background: rgba(240, 247, 255, 0.85); 
  backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid rgba(100, 140, 255, 0.15);
}

.header-inner { 
  display: flex; align-items: center; justify-content: space-between; 
  height: 68px; max-width: 1200px; margin: 0 auto; padding: 0 24px; 
}

.logo { 
  display: flex; align-items: center; gap: 10px; 
  font-weight: 700; font-size: 1.2rem; text-decoration: none; 
  color: #1a2a4a; letter-spacing: 0.5px;
}

.logo-icon { 
  width: 40px; height: 40px; border-radius: 12px; 
  display: flex; align-items: center; justify-content: center; 
  font-size: 1.2rem;
  background: linear-gradient(135deg, #4a8aff, #7c6aff);
  color: #fff;
  box-shadow: 0 4px 12px rgba(74, 138, 255, 0.3);
}

.main-nav { display: flex; align-items: center; gap: 28px; list-style: none; }

.main-nav a { 
  text-decoration: none; font-size: 0.9rem; font-weight: 500; 
  color: #2a3a5a; transition: 0.3s;
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute; bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: linear-gradient(90deg, #4a8aff, #7c6aff);
  transition: 0.3s;
  border-radius: 2px;
}

.main-nav a:hover::after { width: 100%; }

.main-nav a:hover { color: #4a6aff; }

.nav-cta { 
  padding: 10px 24px; border-radius: 24px; 
  background: linear-gradient(135deg, #4a8aff, #7c6aff);
  color: #fff !important; font-weight: 600;
  box-shadow: 0 4px 16px rgba(74, 138, 255, 0.25);
  transition: 0.3s;
}

.nav-cta:hover { 
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(74, 138, 255, 0.35);
}

.nav-cta::after { display: none !important; }

.menu-toggle { display: none; }

/* 首页Hero */
.hero { 
  min-height: 75vh; display: flex; align-items: center;
  position: relative;
  background: linear-gradient(160deg, #e8f4ff 0%, #dce8ff 40%, #f0ecff 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute; top: -20%; right: -10%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(74, 138, 255, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute; bottom: -10%; left: -5%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(124, 106, 255, 0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-content { max-width: 720px; position: relative; z-index: 1; }

.hero-eyebrow { 
  display: inline-block; font-size: 0.8rem; font-weight: 600; 
  padding: 6px 18px; border-radius: 24px; margin-bottom: 18px;
  background: linear-gradient(135deg, rgba(74, 138, 255, 0.15), rgba(124, 106, 255, 0.15));
  color: #4a6aff;
  letter-spacing: 1px;
}

.hero h1 { 
  font-size: 3rem; line-height: 1.15; margin-bottom: 20px;
  background: linear-gradient(135deg, #1a2a4a 0%, #3a5a8a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p { 
  font-size: 1.1rem; opacity: 0.7; max-width: 560px; margin-bottom: 36px;
  color: #3a4a6a;
}

.hero-buttons { display: flex; gap: 14px; }

.hero-image { 
  border-radius: 20px; overflow: hidden;
  box-shadow: 0 20px 60px rgba(74, 138, 255, 0.12);
}

.hero-image img { width: 100%; height: auto; }

/* 按钮 */
.btn { 
  display: inline-flex; align-items: center; gap: 8px; 
  padding: 14px 32px; border-radius: 24px; font-weight: 600; 
  cursor: pointer; border: none; text-decoration: none; 
  transition: 0.3s;
  font-size: 0.95rem;
}

.btn-primary { 
  background: linear-gradient(135deg, #4a8aff, #7c6aff);
  color: #fff;
  box-shadow: 0 4px 16px rgba(74, 138, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(74, 138, 255, 0.35);
}

.btn-outline { 
  background: transparent; border: 1.5px solid #4a8aff;
  color: #4a6aff;
}

.btn-outline:hover {
  background: rgba(74, 138, 255, 0.06);
  border-color: #7c6aff;
}

/* 标签/标题 */
.section-label { 
  display: inline-block; font-size: 0.75rem; font-weight: 600; 
  letter-spacing: 3px; margin-bottom: 14px;
  color: #4a8aff;
  text-transform: uppercase;
}

.section-title { 
  font-size: 2.2rem; margin-bottom: 14px;
  color: #1a2a4a;
  font-weight: 700;
}

.section-desc { 
  max-width: 600px; opacity: 0.7; margin-bottom: 40px;
  color: #3a4a6a;
  line-height: 1.7;
}

/* 卡片网格 */
.cards-grid { 
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); 
  gap: 24px; 
}

.category-card { 
  border-radius: 20px; padding: 32px; 
  border: 1px solid rgba(74, 138, 255, 0.08);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  transition: 0.3s;
}

.category-card:hover { 
  transform: translateY(-4px); 
  box-shadow: 0 8px 32px rgba(74, 138, 255, 0.1);
  border-color: rgba(74, 138, 255, 0.2);
}

.card-icon { 
  width: 52px; height: 52px; border-radius: 14px; 
  display: flex; align-items: center; justify-content: center; 
  margin-bottom: 18px; font-size: 1.4rem;
  background: linear-gradient(135deg, rgba(74, 138, 255, 0.1), rgba(124, 106, 255, 0.1));
}

.card-link { 
  font-weight: 600; font-size: 0.85rem; text-decoration: none;
  color: #4a8aff;
  display: inline-flex; align-items: center; gap: 6px;
}

.card-link:hover { color: #7c6aff; }

/* 特性块 */
.feature-block { 
  display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; 
}

.feature-image { 
  border-radius: 20px; overflow: hidden;
  box-shadow: 0 12px 40px rgba(74, 138, 255, 0.08);
}

.feature-image img { width: 100%; height: auto; }

.feature-text { }

.feature-list { list-style: none; }

.feature-list li { 
  padding: 8px 0; display: flex; align-items: center; gap: 10px;
  color: #2a3a5a;
}

.feature-list li::before { 
  content: '✦'; font-weight: 700; 
  color: #4a8aff;
  font-size: 1.1rem;
}

/* 数据条 */
.stats-bar { 
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; 
}

.stat-item { 
  padding: 32px 20px; border-radius: 20px; 
  border: 1px solid rgba(74, 138, 255, 0.08);
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(4px);
}

.stat-number { 
  font-size: 2.5rem; font-weight: 800;
  background: linear-gradient(135deg, #4a8aff, #7c6aff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label { 
  font-size: 0.9rem; opacity: 0.6; margin-top: 8px;
  color: #3a4a6a;
}

/* 内容墙 */
.content-wall { 
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); 
  gap: 24px; 
}

.content-wall-item { 
  border-radius: 20px; overflow: hidden; 
  border: 1px solid rgba(74, 138, 255, 0.08);
  background: rgba(255, 255, 255, 0.5);
  transition: 0.3s;
}

.content-wall-item:hover { 
  transform: translateY(-4px); 
  box-shadow: 0 8px 32px rgba(74, 138, 255, 0.1);
}

.content-wall-item img { 
  width: 100%; height: 200px; object-fit: cover; 
}

.content-wall-body { padding: 24px; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item { 
  border: 1px solid rgba(74, 138, 255, 0.08); 
  border-radius: 16px; margin-bottom: 10px; 
  overflow: hidden; cursor: pointer;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(4px);
  transition: 0.3s;
}

.faq-item:hover { border-color: rgba(74, 138, 255, 0.2); }

.faq-item .faq-question { 
  padding: 18px 24px; font-weight: 600; 
  display: flex; justify-content: space-between;
  color: #1a2a4a;
  font-size: 1rem;
}

.faq-item .faq-question::after {
  content: '↓';
  transition: 0.3s;
  color: #4a8aff;
}

.faq-item.open .faq-question::after { transform: rotate(180deg); }

.faq-item .faq-answer { 
  padding: 0 24px 18px; display: none; opacity: 0.7;
  color: #3a4a6a;
  line-height: 1.7;
}

.faq-item.open .faq-answer { display: block; }

/* CTA横幅 */
.cta-banner { 
  padding: 64px 24px; text-align: center; 
  border-radius: 24px; 
  background: linear-gradient(135deg, #4a8aff 0%, #7c6aff 100%);
  color: #fff;
  box-shadow: 0 16px 48px rgba(74, 138, 255, 0.2);
}

.cta-banner h2 { 
  color: #fff; font-size: 2rem; margin-bottom: 12px;
}

.cta-banner .btn-primary { 
  background: #fff; color: #4a6aff;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.cta-banner .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* 页脚 */
.site-footer { 
  padding: 60px 0 28px;
  background: linear-gradient(135deg, #1a2a4a 0%, #2a3a5a 100%);
  color: rgba(255, 255, 255, 0.8);
}

.site-footer .container { }

.footer-grid { 
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; 
}

.footer-brand { }

.footer-col { }

.footer-col h4 { 
  color: #fff; margin-bottom: 16px; font-weight: 600;
  font-size: 1rem;
}

.footer-col ul { list-style: none; }

.footer-col ul li { margin-bottom: 8px; }

.footer-col ul li a { 
  color: rgba(255, 255, 255, 0.6); text-decoration: none;
  transition: 0.3s;
}

.footer-col ul li a:hover { color: #8ab4ff; }

.footer-bottom { 
  border-top: 1px solid rgba(255, 255, 255, 0.06); 
  margin-top: 40px; padding-top: 24px; 
  text-align: center; font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

/* 工具类 */
.text-accent { color: #4a8aff; }

.text-center { text-align: center; }

.seo-description { 
  max-width: 600px; margin: 0 auto 48px; opacity: 0.7;
  color: #3a4a6a;
  line-height: 1.7;
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* 响应式 */
@media (max-width: 768px) {
  .feature-block { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .main-nav { display: none; }
  .menu-toggle { display: flex; }
  .main-nav.open { 
    display: flex; flex-direction: column; 
    position: absolute; top: 68px; left: 0; width: 100%; 
    background: rgba(240, 247, 255, 0.98); 
    padding: 24px;
    border-bottom: 1px solid rgba(74, 138, 255, 0.1);
  }
  .hero h1 { font-size: 2.2rem; }
  .section-title { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .cards-grid, .content-wall, .stats-bar { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; }
  .hero h1 { font-size: 1.8rem; }
}