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

:root {
  --primary-color: #0066ff;
  --primary-hover: #0052cc;
  --text-dark: #1a1a1a;
  --text-gray: #666;
  --text-light: #999;
  --bg-light: #f8f9fa;
  --bg-white: #ffffff;
  --border-color: #e5e5e5;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background: var(--bg-white);
}

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

/* 导航栏 */
.navbar {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 36px;
  height: 36px;
  background: var(--primary-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  font-size: 18px;
}

.brand-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-dark);
}

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

.nav-links a {
  color: var(--text-gray);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s;
}

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

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

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

.hero-title {
  font-size: 56px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 24px;
  margin-bottom: 24px;
  opacity: 0.95;
}

.hero-description {
  font-size: 18px;
  line-height: 1.8;
  margin-bottom: 40px;
  opacity: 0.9;
}

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

/* 按钮 */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

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

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

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

.btn-secondary:hover {
  background: var(--bg-light);
  transform: translateY(-2px);
}

.btn-large {
  padding: 16px 48px;
  font-size: 18px;
}

/* 区块标题 */
.section-title {
  font-size: 36px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 60px;
  color: var(--text-dark);
}

/* 功能特性 */
.features {
  padding: 80px 0;
  background: var(--bg-light);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.feature-card {
  background: white;
  padding: 40px 32px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition:
    transform 0.2s,
    box-shadow 0.2s;
}

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

.feature-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.feature-card p {
  color: var(--text-gray);
  line-height: 1.7;
}

/* 界面预览 */
.screenshots {
  padding: 80px 0;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 24px;
}

.screenshot-item {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition:
    transform 0.3s,
    box-shadow 0.3s;
  background: var(--bg-light);
}

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

.screenshot-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.screenshot-placeholder {
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-gray);
  font-size: 18px;
}

/* 使用场景 */
.use-cases {
  padding: 80px 0;
  background: var(--bg-light);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.use-case {
  background: white;
  padding: 32px;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.use-case h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.use-case p {
  color: var(--text-gray);
  line-height: 1.7;
}

/* 下载区域 */
.download {
  padding: 80px 0;
}

.download-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  max-width: 900px;
  margin: 0 auto;
}

.download-info {
  text-align: center;
}

.download-info h3 {
  font-size: 28px;
  margin-bottom: 16px;
}

.version {
  font-size: 16px;
  color: var(--text-gray);
  margin-bottom: 8px;
}

.file-size {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 32px;
}

.download-note {
  margin-top: 24px;
  font-size: 14px;
  color: var(--text-gray);
}

.system-requirements {
  background: var(--bg-light);
  padding: 32px;
  border-radius: 12px;
}

.system-requirements h4 {
  font-size: 20px;
  margin-bottom: 16px;
  color: var(--text-dark);
}

.system-requirements ul {
  list-style: none;
}

.system-requirements li {
  padding: 8px 0;
  color: var(--text-gray);
  position: relative;
  padding-left: 24px;
}

.system-requirements li:before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
}

/* 页脚 */
.footer {
  background: var(--text-dark);
  color: white;
  padding: 40px 0 20px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand .logo {
  width: 32px;
  height: 32px;
  font-size: 16px;
}

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

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
  color: rgba(255, 255, 255, 0.5);
  font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-links {
    gap: 16px;
    font-size: 14px;
  }

  .hero {
    padding: 60px 0;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

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

  .section-title {
    font-size: 28px;
    margin-bottom: 40px;
  }

  .features-grid,
  .screenshot-grid,
  .use-cases-grid {
    grid-template-columns: 1fr;
  }

  .download-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }

  .footer-links {
    flex-direction: column;
    gap: 12px;
  }
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 选中文本样式 */
::selection {
  background: var(--primary-color);
  color: white;
}