/* 全新设计系统 - 突破传统框架 */
/* 核心设计理念：沉浸式、动态、极简、未来感 */

/* 全局重置与基础设置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* CSS变量 - 动态色彩系统 */
:root {
  /* 主色调 - 自然渐变系列 */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --success-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  
  /* 背景与表面 */
  --bg-primary: #0a0e27;
  --bg-secondary: #1a1f3a;
  --bg-tertiary: #252b4a;
  --surface-primary: rgba(255, 255, 255, 0.05);
  --surface-secondary: rgba(255, 255, 255, 0.08);
  
  /* 文本颜色 */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.8);
  --text-tertiary: rgba(255, 255, 255, 0.6);
  --text-accent: #4facfe;
  
  /* 边框与阴影 */
  --border-primary: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(79, 172, 254, 0.3);
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 40px 50px -15px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(79, 172, 254, 0.3);
  
  /* 圆角与过渡 */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 50%;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* 排版系统 */
  --font-primary: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* 间距系统 */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  --space-3xl: 96px;
  
  /* 动画变量 */
  --animation-speed: 20s;
  --animation-delay: 0s;
  --animation-direction: alternate;
}

/* 基础样式 */
html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 动态背景 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(240, 147, 251, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 40% 80%, rgba(79, 172, 254, 0.15) 0%, transparent 50%);
  z-index: -2;
  animation: backgroundShift var(--animation-speed) var(--animation-delay) infinite var(--animation-direction);
}

/* 网格覆盖层 */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  z-index: -1;
  pointer-events: none;
}

/* 背景动画 */
@keyframes backgroundShift {
  0% {
    transform: scale(1) rotate(0deg);
  }
  100% {
    transform: scale(1.2) rotate(5deg);
  }
}

/* 导航栏 - 悬浮效果 */
.nav {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 14, 39, 0.8);
  border-bottom: 1px solid var(--border-primary);
  transition: all var(--transition-normal);
}

.nav:hover {
  background: rgba(10, 14, 39, 0.95);
  box-shadow: var(--shadow-glow);
}

/* 品牌标识 - 动态效果 */
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--text-primary);
  letter-spacing: 0.5px;
  text-decoration: none;
  position: relative;
  transition: all var(--transition-normal);
}

.brand::before {
  content: '';
  position: absolute;
  top: -10px;
  left: -10px;
  right: -10px;
  bottom: -10px;
  background: var(--primary-gradient);
  border-radius: var(--radius-md);
  z-index: -1;
  opacity: 0;
  transition: all var(--transition-normal);
  filter: blur(20px);
}

.brand:hover::before {
  opacity: 0.3;
  transform: scale(1.1);
}

.brand:hover {
  transform: translateY(-2px);
}

/* Logo容器 - 3D效果 */
.brand .logo {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  background: var(--surface-primary);
  background-image: url('app-icon.png');
  background-size: cover;
  background-position: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-bounce);
  border: 2px solid var(--border-primary);
  position: relative;
  overflow: hidden;
}

.brand .logo::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: all var(--transition-normal);
}

/* Site Logo */
.site-logo {
  width: 200px;
  height: 60px;
  background-image: url('logo.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: left center;
  margin: 1rem 0 2rem;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.15));
  transition: all var(--transition-normal);
}

.site-logo:hover {
  filter: drop-shadow(0 6px 20px rgba(0, 0, 0, 0.2));
  transform: translateY(-2px);
}

.brand:hover .logo {
  transform: scale(1.1) rotate(5deg);
  box-shadow: var(--shadow-glow);
  border-color: #4facfe;
}

.brand:hover .logo::after {
  left: 100%;
}

/* 导航链接 - 动态下划线 */
.links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-normal);
  position: relative;
  padding: var(--space-xs) 0;
}

.links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: all var(--transition-normal);
  border-radius: 1px;
}

.links a:hover {
  color: var(--text-primary);
  transform: translateY(-2px);
}

.links a:hover::after {
  width: 100%;
  box-shadow: 0 0 10px rgba(79, 172, 254, 0.5);
}

/* 主内容区域 - 沉浸式布局 */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
  position: relative;
  z-index: 1;
}

/* 卡片组件 - 玻璃态效果 */
.card {
  background: var(--surface-primary);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  margin-bottom: var(--space-2xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transition: all var(--transition-normal);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(79, 172, 254, 0.5);
}

.card:hover::before {
  transform: scaleX(1);
}

/* 标题样式 - 渐变文字 */
.title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 6rem);
  line-height: 1.05;
  font-weight: 900;
  margin-bottom: var(--space-lg);
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
  position: relative;
  display: inline-block;
}

.title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--primary-gradient);
  border-radius: 2px;
}

/* 副标题样式 */
.subtitle {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  line-height: 1.5;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  font-weight: 300;
  max-width: 800px;
}

/* 按钮组件 - 动态效果 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  transition: all var(--transition-bounce);
  position: relative;
  overflow: hidden;
  border: none;
  cursor: pointer;
  font-family: var(--font-primary);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* 主按钮 */
.btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: var(--shadow-md);
}

/* 次要按钮 */
.btn-secondary {
  background: var(--surface-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
  box-shadow: var(--shadow-sm);
}

/* 按钮悬停效果 */
.btn:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn:active {
  transform: translateY(-1px) scale(0.98);
}

/* 按钮内部发光效果 */
.btn::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, transparent 70%);
  opacity: 0;
  transition: all var(--transition-normal);
  transform: scale(0.5);
}

.btn:hover::before {
  opacity: 1;
  transform: scale(1);
}

/* CTA区域 - 动态布局 */
.cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-top: var(--space-xl);
  align-items: center;
}

/* 特性网格 - 3D卡片效果 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-2xl);
  margin-top: var(--space-2xl);
  perspective: 1000px;
}

.feature-card {
  background: var(--surface-primary);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-bounce);
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
  cursor: pointer;
}

.feature-card:hover {
  transform: rotateX(5deg) rotateY(5deg) translateY(-10px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(79, 172, 254, 0.5);
}

/* 特性图标 - 动态背景 */
.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  display: inline-block;
  transition: all var(--transition-normal);
  position: relative;
}

.feature-icon::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  opacity: 0.1;
  transition: all var(--transition-normal);
  z-index: -1;
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(10deg);
}

.feature-card:hover .feature-icon::before {
  transform: translate(-50%, -50%) scale(1.3);
  opacity: 0.2;
}

/* 特性标题 */
.feature-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  transition: all var(--transition-normal);
}

.feature-card:hover .feature-title {
  color: #4facfe;
}

/* 特性描述 */
.feature-description {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 列表样式 - 自定义设计 */
ul {
  margin: var(--space-md) 0 var(--space-xl) var(--space-lg);
  color: var(--text-secondary);
}

li {
  margin-bottom: var(--space-sm);
  position: relative;
  padding-left: var(--space-md);
  font-size: 1.1rem;
  line-height: 1.6;
}

li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: #4facfe;
  font-weight: bold;
  transition: all var(--transition-normal);
}

li:hover::before {
  transform: translateX(5px);
  color: #00f2fe;
}

/* 页脚 - 极简设计 */
.footer {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  border-top: 1px solid var(--border-primary);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 14, 39, 0.8);
  margin-top: var(--space-3xl);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-normal);
  font-weight: 600;
}

.footer-links a:hover {
  color: #4facfe;
  transform: translateY(-2px);
}

/* 响应式设计 - 移动优先 */
@media (max-width: 768px) {
  :root {
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
  }
  
  .nav {
    flex-direction: column;
    gap: var(--space-md);
    padding: var(--space-sm);
  }
  
  .links {
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .container {
    padding: var(--space-xl) var(--space-sm);
  }
  
  .card {
    padding: var(--space-xl) var(--space-md);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .cta {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn {
    justify-content: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: var(--space-md);
  }
}

/* 动画类 */
.fade-in {
  animation: fadeIn var(--transition-slow) ease-out forwards;
  opacity: 1;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-in-left {
  animation: slideInLeft var(--transition-slow) ease-out forwards;
  opacity: 0;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-right {
  animation: slideInRight var(--transition-slow) ease-out forwards;
  opacity: 0;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 滚动进度指示器 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent-gradient);
  z-index: 1000;
  width: 0%;
  transition: width 0.1s ease-out;
  box-shadow: 0 0 10px rgba(79, 172, 254, 0.5);
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-primary);
  border-radius: var(--radius-full);
  border-top-color: #4facfe;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 文本选择样式 */
::selection {
  background: rgba(79, 172, 254, 0.3);
  color: var(--text-primary);
}

::-moz-selection {
  background: rgba(79, 172, 254, 0.3);
  color: var(--text-primary);
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
  background: #4facfe;
}