/* 产品页共用：设计变量 / 按钮 / 区块标题 / 面包屑 / CTA / 入场动画 */
:root {
  --primary: #165DFF;
  --purple: #722ED1;
  --cyan: #00B4D8;
  --dark: #1D2129;
  --gray-1: #4E5969;
  --gray-2: #86909C;
  --gray-3: #C9CDD4;
  --gray-4: #F2F3F5;
  --white: #FFFFFF;
  --gradient-1: linear-gradient(135deg, #165DFF 0%, #722ED1 100%);
  --gradient-2: linear-gradient(135deg, #00B4D8 0%, #165DFF 100%);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.16);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --primary-blue: #165DFF;
  --primary-blue-dark: #0E42D2;
  --primary-blue-light: #E8F3FF;
  --accent-purple: #722ED1;
  --accent-cyan: #00B4D8;
  --accent-green: #00B42A;
  --accent-orange: #FF7D00;
  --text-primary: #1D2129;
  --text-secondary: #4E5969;
  --text-tertiary: #86909C;
  --bg-white: #FFFFFF;
  --bg-gray: #F7F9FC;
  --bg-dark: #1D2129;
  --border-color: #E5E6EB;
}

html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--dark);
  line-height: 1.6;
  background: var(--white);
  overflow-x: hidden;
}

.page-breadcrumb,
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--gray-2);
}
.page-breadcrumb a,
.breadcrumb a {
  color: var(--gray-2);
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-breadcrumb a:hover,
.breadcrumb a:hover { color: var(--primary); }
.page-breadcrumb span,
.breadcrumb span { color: var(--dark); }

.btn {
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--gradient-1);
  color: var(--white);
  box-shadow: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-secondary {
  background: var(--white);
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn-secondary:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
}
.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.section { padding: 100px 0; }
.section-gray { background: #F7F9FC; }
.section-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(22, 93, 255, 0.1);
  color: var(--primary);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 16px;
}
.section-title {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--dark);
  letter-spacing: -0.3px;
}
.section-desc {
  font-size: 18px;
  color: var(--gray-1);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

.cta-section {
  padding: 100px 0;
  background: var(--gradient-1);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 50%);
}
.cta-box {
  max-width: 800px;
  margin: 0 auto;
  padding: 0;
  background: transparent;
  position: relative;
  z-index: 1;
}
.cta-box h2 {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--white);
}
.cta-box p {
  font-size: 18px;
  color: rgba(255,255,255,0.9);
  margin-bottom: 40px;
}
.cta-box .btn-primary {
  background: var(--white);
  color: var(--primary);
}
.cta-box .btn-primary:hover {
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}
.cta-box .btn-secondary {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.7);
}
.cta-box .btn-secondary:hover {
  background: var(--white);
  color: var(--primary);
  border-color: var(--white);
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* FAQ 共用 */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-4);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
  text-align: left;
}
.faq-item h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 10px;
}
.faq-item p {
  font-size: 15px;
  color: var(--gray-1);
  line-height: 1.8;
  margin: 0;
}
.faq-item a {
  color: var(--primary);
  text-decoration: none;
}
.faq-item a:hover { text-decoration: underline; }


@media (max-width: 768px) {
  .section-container { padding: 0 20px; }
  .section-title { font-size: 28px; }
  .cta-box h2 { font-size: 28px; }
  .hero-buttons { flex-direction: column; }
}