/* CSS变量定义 */
:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

/* 全局样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Microsoft YaHei', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 容器样式 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-logo {
  height: 40px;
  width: auto;
}

.brand-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-color);
  border-radius: 1px;
}

.btn-login {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.875rem;
}

.btn-login:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* 按钮组件 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.875rem;
  line-height: 1;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* 主要内容区域 */
.main-content {
  margin-top: 70px;
}

/* 英雄区域 */
.hero-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 6rem 0;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
  opacity: 0.3;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 600px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.gradient-text {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.125rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  height: 500px;
}

.hero-image {
  position: relative;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
  border-radius: var(--radius-xl);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.floating-card {
  position: absolute;
  background: white;
  color: var(--text-primary);
  padding: 1rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 500;
  animation: float 6s ease-in-out infinite;
}

.card-icon {
  font-size: 1.5rem;
}

.card-1 {
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.card-2 {
  top: 20%;
  right: 15%;
  animation-delay: 1s;
}

.card-3 {
  top: 50%;
  left: 5%;
  animation-delay: 2s;
}

.card-4 {
  bottom: 30%;
  right: 10%;
  animation-delay: 3s;
}

.card-5 {
  bottom: 10%;
  left: 20%;
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* 区域标题样式 */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* 新零售概念区域 */
.concept-section {
  padding: 6rem 0;
  background: var(--bg-secondary);
}

.concept-content {
  max-width: 800px;
  margin: 0 auto;
}

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

.concept-text p {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.highlight {
  color: var(--primary-color);
  font-weight: 600;
}

.concept-highlight {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  padding: 1.5rem 2rem;
  border-radius: var(--radius-lg);
  text-align: center;
}

.highlight-text {
  font-size: 1.25rem;
  font-weight: 600;
}

/* 解决方案区域 */
.solutions-section {
  padding: 6rem 0;
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.solution-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  border: 1px solid var(--border-light);
}

.solution-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.solution-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

.solution-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.solution-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.solution-features {
  list-style: none;
}

.solution-features li {
  padding: 0.5rem 0;
  color: var(--text-secondary);
  position: relative;
  padding-left: 1.5rem;
}

.solution-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--success-color);
  font-weight: bold;
}

/* 零售本质区域 */
.essence-section {
  padding: 6rem 0;
  background: var(--bg-secondary);
}

.essence-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.essence-text p {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

.essence-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.flow-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.flow-icon {
  font-size: 3rem;
  background: white;
  padding: 1.5rem;
  border-radius: 50%;
  box-shadow: var(--shadow-lg);
}

.flow-label {
  font-weight: 600;
  color: var(--text-primary);
}

.flow-arrow {
  font-size: 2rem;
  color: var(--primary-color);
  font-weight: bold;
}

/* 对比分析区域 */
.comparison-section {
  padding: 6rem 0;
}

.comparison-content {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 3rem;
  align-items: start;
}

.comparison-side {
  background: white;
  padding: 2rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

.traditional {
  border-left: 4px solid var(--error-color);
}

.modern {
  border-left: 4px solid var(--success-color);
}

.comparison-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
}

.comparison-item {
  margin-bottom: 1.5rem;
}

.comparison-item h4 {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.comparison-item p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.comparison-vs {
  display: flex;
  align-items: center;
  justify-content: center;
}

.vs-circle {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  font-size: 1.25rem;
  box-shadow: var(--shadow-lg);
}

.comparison-advantages {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.advantage-tag {
  background: var(--success-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.875rem;
  font-weight: 500;
}

/* CTA区域 */
.cta-section {
  padding: 6rem 0;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  text-align: center;
}

.cta-content {
  max-width: 600px;
  margin: 0 auto;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-description {
  font-size: 1.125rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.cta-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.cta-actions .btn-primary {
  background: white;
  color: var(--primary-color);
}

.cta-actions .btn-primary:hover {
  background: var(--bg-tertiary);
}

.cta-actions .btn-outline {
  border-color: white;
  color: white;
}

.cta-actions .btn-outline:hover {
  background: white;
  color: var(--primary-color);
}

/* 页脚样式 */
.footer {
  background: var(--text-primary);
  color: white;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo {
  height: 40px;
  width: auto;
}

.footer-description {
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-column h4 {
  font-weight: 600;
  margin-bottom: 1rem;
  color: white;
}

.footer-column a {
  display: block;
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

.footer-column a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  text-align: center;
  color: var(--text-muted);
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .solutions-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
  
  .comparison-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .comparison-vs {
    order: -1;
  }
}

@media (max-width: 768px) {
  .nav-container {
    padding: 0 1rem;
  }
  
  .nav-menu {
    display: none;
  }
  
  .hero-section {
    padding: 4rem 0;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .solutions-grid {
    grid-template-columns: 1fr;
  }
  
  .essence-diagram {
    flex-direction: column;
  }
  
  .flow-arrow {
    transform: rotate(90deg);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .cta-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .floating-card {
    position: static;
    margin: 1rem;
    animation: none;
  }
  
  .hero-visual {
    height: auto;
  }
  
  .hero-image {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
}