/* ========================================
   南京科进 - 产品专题页
   设计风格：简洁、专业、现代（苹果/华为风格）
   ======================================== */

/* 全局变量 - 统一色调 */
:root {
  --primary: #0066cc;
  --primary-dark: #0052a3;
  --primary-light: #e6f2ff;
  --accent: #00a3ff;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --bg: #ffffff;
  --bg-secondary: #f5f5f7;
  --bg-tertiary: #fbfbfd;
  --border: #d2d2d7;
  --shadow: rgba(0, 0, 0, 0.04);
  --shadow-lg: rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --radius-lg: 20px;
}

/* 基础重置 */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body { 
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'Microsoft YaHei', sans-serif; 
  color: var(--text); 
  background: var(--bg); 
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: color 0.2s; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.section { padding: 100px 0; }

/* ========================================
   导航栏
   ======================================== */
.section-nav { 
  background: rgba(255, 255, 255, 0.8); 
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  position: fixed; 
  top: 0; 
  left: 0; 
  right: 0; 
  z-index: 1000; 
  padding: 0;
}

.nav-container { 
  display: flex; 
  align-items: center; 
  justify-content: space-between; 
  height: 56px; 
}

.nav-left { 
  display: flex; 
  align-items: center; 
  gap: 10px; 
}

.logo { height: 32px; }
.site-name { font-size: 1.1rem; font-weight: 600; color: var(--text); letter-spacing: -0.02em; }

.main-nav { 
  display: flex; 
  align-items: center;
  gap: 36px; 
}

.main-nav a { 
  font-size: 0.9rem; 
  color: var(--text-secondary); 
  transition: color 0.2s; 
  font-weight: 500;
}

.main-nav a:hover { color: var(--text); }

.nav-phone {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-phone:hover {
  background: var(--primary-dark);
  transform: scale(1.02);
}

.nav-phone svg {
  width: 16px;
  height: 16px;
}

/* ========================================
   Banner 区块
   ======================================== */
.section-banner { 
  background: linear-gradient(180deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  padding: 140px 0 100px;
  text-align: center;
  margin-top: 56px;
  position: relative;
  overflow: hidden;
}

.section-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at center, rgba(0, 102, 204, 0.03) 0%, transparent 70%);
  pointer-events: none;
}

.banner-content { 
  max-width: 800px; 
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.banner-content h1 { 
  font-size: 3rem; 
  font-weight: 700; 
  margin-bottom: 16px;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--text);
}

.banner-subtitle { 
  font-size: 1.25rem; 
  color: var(--primary);
  margin-bottom: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.banner-desc { 
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.7;
}

.banner-btn { 
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: #fff;
  padding: 14px 32px;
  border-radius: 980px;
  font-weight: 500;
  font-size: 1rem;
  transition: all 0.25s;
}

.banner-btn:hover { 
  background: var(--primary-dark);
  transform: scale(1.02);
}

.banner-btn::after {
  content: '→';
  font-size: 1.1em;
}

/* ========================================
   区块标题
   ======================================== */
.section-header { 
  text-align: center; 
  margin-bottom: 60px; 
}

.section-header h2 { 
  font-size: 2.25rem; 
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-header p { 
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   产品特色区块
   ======================================== */
.section-features { 
  background: var(--bg);
}

.features-layout { 
  display: grid; 
  grid-template-columns: 1fr 1fr; 
  gap: 24px; 
  margin-bottom: 24px;
}

.feature-card { 
  background: var(--bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.feature-card:hover { 
  box-shadow: 0 20px 60px var(--shadow-lg);
  transform: translateY(-4px);
  border-color: transparent;
}

.feature-card-main { 
  position: relative;
  height: 100%;
  min-height: 420px;
  background: var(--bg-secondary);
}

.feature-card-main .feature-img { 
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 40px;
}

.feature-card-main .feature-overlay { 
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 32px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.75));
  color: #fff;
}

.feature-card-main .feature-overlay h3 { 
  font-size: 1.35rem;
  margin-bottom: 6px;
  font-weight: 600;
}

.feature-card-main .feature-overlay p { 
  opacity: 0.9;
  font-size: 1rem;
}

.features-side { 
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.feature-card-small { 
  padding: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.feature-icon { 
  width: 52px;
  height: 52px;
  background: var(--primary-light);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary);
}

.feature-icon svg { 
  width: 26px;
  height: 26px;
}

.feature-card-small h3 { 
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--text);
  font-weight: 600;
}

.feature-card-small p { 
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.feature-card-wide { 
  padding: 40px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.feature-card-wide .feature-icon { 
  flex-shrink: 0;
}

.feature-card-wide h3 { 
  font-size: 1.05rem;
  margin-bottom: 10px;
  font-weight: 600;
}

.feature-card-wide p { 
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ========================================
   关于企业区块
   ======================================== */
.section-about { 
  background: var(--bg-secondary);
}

.about-content { 
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 80px;
}

.about-text h2 { 
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.about-text p { 
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.8;
}

.about-stats { 
  display: flex;
  gap: 60px;
}

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

.stat-num { 
  display: block;
  font-size: 3rem;
  font-weight: 600;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 10px;
  letter-spacing: -0.03em;
}

.stat-label { 
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ========================================
   价格区块
   ======================================== */
.section-pricing { 
  background: var(--bg);
}

.pricing-cards { 
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pricing-card { 
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 36px;
  position: relative;
  transition: all 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.pricing-card:hover { 
  transform: translateY(-6px);
  box-shadow: 0 24px 64px var(--shadow-lg);
  border-color: transparent;
}

.pricing-card-hot { 
  border: 2px solid var(--primary);
  box-shadow: 0 8px 32px rgba(0, 102, 204, 0.12);
}

.pricing-badge { 
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #fff;
  padding: 6px 20px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.pricing-header-card { 
  margin-bottom: 24px;
  text-align: center;
}

.pricing-tag { 
  font-size: 0.85rem;
  color: var(--text-tertiary);
  display: block;
  margin-bottom: 8px;
}

.pricing-header-card h3 { 
  font-size: 1.75rem;
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.pricing-features { 
  list-style: none;
  margin-bottom: 28px;
}

.pricing-features li { 
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  flex-shrink: 0;
}

.pricing-features li:last-child { 
  border-bottom: none;
}

.pricing-btn { 
  display: block;
  text-align: center;
  background: var(--primary);
  color: #fff;
  padding: 14px 24px;
  border-radius: 980px;
  font-weight: 500;
  transition: all 0.2s;
}

.pricing-btn:hover { 
  background: var(--primary-dark);
}

.pricing-card-hot .pricing-btn {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
}

/* ========================================
   FAQ区块
   ======================================== */
.section-faq { 
  background: var(--bg-secondary);
}

.faq-list { 
  max-width: 800px;
  margin: 0 auto;
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 0 32px;
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.faq-item { 
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.faq-item:last-child { 
  border-bottom: none;
}

.faq-question { 
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  cursor: pointer;
  font-weight: 500;
  color: var(--text);
  font-size: 1rem;
  transition: color 0.2s;
}

.faq-question:hover { 
  color: var(--primary);
}

.faq-icon { 
  width: 24px;
  height: 24px;
  position: relative;
  flex-shrink: 0;
}

.faq-icon::before, .faq-icon::after { 
  content: '';
  position: absolute;
  background: currentColor;
  transition: transform 0.25s;
  border-radius: 2px;
}

.faq-icon::before { 
  width: 2px;
  height: 12px;
  top: 6px;
  left: 11px;
}

.faq-icon::after { 
  width: 12px;
  height: 2px;
  top: 11px;
  left: 6px;
}

.faq-item.active .faq-icon::before { 
  transform: rotate(90deg);
}

.faq-answer { 
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.25, 0.1, 0.25, 1), padding 0.35s;
}

.faq-item.active .faq-answer { 
  max-height: 200px;
  padding-bottom: 24px;
}

.faq-answer { 
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* ========================================
   联系我们区块
   ======================================== */
.section-contact { 
  background: var(--text);
  color: #fff;
}

.contact-wrapper { 
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 80px;
}

.contact-info h2 { 
  font-size: 2rem;
  margin-bottom: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.contact-desc { 
  opacity: 0.7;
  margin-bottom: 40px;
  font-size: 1.05rem;
}

.contact-items { 
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contact-item { 
  display: flex;
  align-items: center;
  gap: 20px;
}

.contact-icon { 
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon svg { 
  width: 22px;
  height: 22px;
}

.contact-text { 
  display: flex;
  flex-direction: column;
}

.contact-label { 
  font-size: 0.85rem;
  opacity: 0.6;
  margin-bottom: 4px;
}

.contact-phone { 
  font-size: 1.3rem;
  font-weight: 500;
  color: #fff;
}

.contact-qrcode { 
  text-align: center;
  background: #fff;
  padding: 28px;
  border-radius: var(--radius-lg);
}

.contact-qrcode img { 
  width: 160px;
  height: 160px;
  margin-bottom: 16px;
}

.contact-qrcode p { 
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ========================================
   侧边咨询按钮
   ======================================== */
.side-consult-btn { 
  position: fixed;
  right: 28px;
  bottom: 100px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--primary);
  color: #fff;
  padding: 16px 28px;
  border-radius: 980px;
  font-weight: 500;
  box-shadow: 0 12px 40px rgba(0, 102, 204, 0.35);
  z-index: 999;
  transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.side-consult-btn svg { 
  width: 20px;
  height: 20px;
}

.side-consult-btn:hover { 
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 16px 48px rgba(0, 102, 204, 0.45);
  background: var(--primary-dark);
}

/* ========================================
   页脚
   ======================================== */
.section-footer { 
  background: var(--text);
  color: rgba(255, 255, 255, 0.6);
  padding: 48px 0;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.section-footer p { 
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.section-footer a { 
  color: rgba(255, 255, 255, 0.8);
}

.section-footer a:hover {
  color: #fff;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
  .features-layout { 
    grid-template-columns: 1fr; 
  }
  
  .feature-card-main { 
    min-height: 320px; 
  }
  
  .pricing-cards { 
    grid-template-columns: 1fr;
    max-width: 420px;
    margin: 0 auto;
  }
}

@media (max-width: 900px) {
  .main-nav { 
    display: none; 
  }
  
  .nav-phone span {
    display: none;
  }
  
  .nav-phone {
    padding: 10px;
    border-radius: 50%;
  }
  
  .about-content { 
    flex-direction: column;
    text-align: center;
    gap: 48px;
  }
  
  .about-stats { 
    justify-content: center;
    gap: 40px;
  }
  
  .contact-wrapper { 
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 48px;
  }
  
  .contact-item { 
    justify-content: center;
  }
  
  .contact-items { 
    align-items: center;
  }
}

@media (max-width: 600px) {
  .section { 
    padding: 64px 0;
  }
  
  .section-banner {
    padding: 100px 0 60px;
  }
  
  .banner-content h1 { 
    font-size: 2rem;
  }
  
  .banner-subtitle {
    font-size: 1rem;
  }
  
  .section-header h2 {
    font-size: 1.75rem;
  }
  
  .features-side { 
    grid-template-columns: 1fr; 
  }
  
  .feature-card-wide { 
    flex-direction: column;
    text-align: center;
  }
  
  .about-stats { 
    flex-wrap: wrap;
    gap: 32px;
  }
  
  .stat-item { 
    flex: 1 1 40%;
  }
  
  .stat-num {
    font-size: 2.25rem;
  }
  
  .side-consult-btn { 
    right: 20px;
    bottom: 60px;
    padding: 14px 24px;
  }
}