/* 基础样式 */
:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --bg: #ffffff;
  --bg-secondary: #f9fafb;
  --text: #1f2937;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

a {
  color: inherit;
  text-decoration: none;
}

/* 导航栏 */
.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);
  z-index: 100;
  padding: 16px 0;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--primary);
}

/* 主视觉 */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.hero h1 {
  font-size: 72px;
  font-weight: bold;
  margin-bottom: 16px;
}

.hero .tagline {
  font-size: 32px;
  opacity: 0.9;
  margin-bottom: 16px;
}

.hero .description {
  font-size: 18px;
  opacity: 0.8;
  max-width: 600px;
  margin: 0 auto 40px;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

/* 按钮 */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
}

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

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

.btn-secondary {
  background: transparent;
  color: white;
  border: 2px solid white;
}

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

/* 功能特性 */
.features {
  padding: 100px 0;
  background: var(--bg);
}

.features h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  padding: 32px;
  background: var(--bg-secondary);
  border-radius: 12px;
  text-align: center;
  transition: all 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-secondary);
}

/* 技术栈 */
.tech-stack {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.tech-stack h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
}

.tech-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.tech-item {
  padding: 12px 24px;
  background: var(--primary);
  color: white;
  border-radius: 8px;
  font-weight: 500;
}

/* 下载 */
.download {
  padding: 100px 0;
  background: var(--bg);
  text-align: center;
}

.download h2 {
  font-size: 36px;
  margin-bottom: 16px;
}

.download > .container > p {
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.download-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 32px;
}

.download .btn {
  min-width: 160px;
}

.note {
  color: var(--text-secondary);
  font-size: 14px;
}

.note code {
  background: var(--bg-secondary);
  padding: 4px 8px;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', monospace;
}

/* 页脚 */
.footer {
  padding: 32px 0;
  background: var(--text);
  color: white;
  text-align: center;
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  opacity: 0.8;
  transition: opacity 0.2s;
}

.footer-links a:hover {
  opacity: 1;
}

/* 响应式 */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero h1 {
    font-size: 48px;
  }

  .hero .tagline {
    font-size: 24px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .download-buttons {
    flex-direction: column;
    align-items: center;
  }

  .footer .container {
    flex-direction: column;
    gap: 16px;
  }
}