/* 全局重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Roboto, sans-serif;
}

/* 配色：科技风 + 草地绿 + 湖水蓝 */
:root {
  --grass-green: #2ECC71;
  --lake-blue: #3498DB;
  --dark-bg: #121212;
  --card-bg: #1E1E1E;
  --text-primary: #fff;
  --text-secondary: #b0b0b0;
  --border: #2a2a2a;
}

body {
  background: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.6;
}

/* 导航栏 */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 5%;
  background: rgba(18,18,18,0.9);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 99;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: bold;
  color: var(--grass-green);
}
.logo img {
  height: 36px;
}
.nav-links {
  display: flex;
  gap: 30px;
}
.nav-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 16px;
  transition: 0.3s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--lake-blue);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: 0.3s;
  border: none;
  cursor: pointer;
  font-size: 16px;
}
.btn-green {
  background: var(--grass-green);
  color: #000;
}
.btn-blue {
  background: var(--lake-blue);
  color: #fff;
}
.btn:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 20px;
}

/* 首页banner */
.banner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 40px 0;
}
.banner-img img {
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 0 30px rgba(46, 204, 113, 0.2);
}
.banner-text h1 {
  font-size: 42px;
  background: linear-gradient(90deg, var(--grass-green), var(--lake-blue));
  -webkit-background-clip: text;
  color: transparent;
  margin-bottom: 20px;
}
.banner-text p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

/* 产品介绍 */
.section-title {
  text-align: center;
  font-size: 32px;
  margin-bottom: 40px;
  color: var(--lake-blue);
}
.intro-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}
.intro-card {
  background: var(--card-bg);
  padding: 25px;
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: 0.3s;
}
.intro-card:hover {
  border-color: var(--grass-green);
  transform: translateY(-5px);
}
.intro-card h3 {
  color: var(--grass-green);
  margin-bottom: 12px;
  font-size: 18px;
}
.intro-card p {
  color: var(--text-secondary);
  font-size: 15px;
}

/* 版本更新 */
.update-list {
  margin-top: 50px;
}
.update-item {
  background: var(--card-bg);
  padding: 18px 22px;
  border-radius: 8px;
  margin-bottom: 12px;
  border-left: 4px solid var(--lake-blue);
}
.update-item h4 {
  color: var(--grass-green);
  margin-bottom: 6px;
}
.update-item p {
  color: var(--text-secondary);
}

/* 下载页 */
.download-main {
  text-align: center;
}
.download-img {
  max-width: 600px;
  margin: 0 auto 30px;
}
.download-img img {
  width: 100%;
  border-radius: 12px;
}
.download-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 40px 0;
  flex-wrap: wrap;
}

/* 404页面 */
.page-404 {
  text-align: center;
  padding: 100px 20px;
}
.page-404 h1 {
  font-size: 100px;
  color: var(--grass-green);
}
.page-404 h2 {
  font-size: 30px;
  margin: 20px 0;
  color: var(--lake-blue);
}
.page-404 p {
  color: var(--text-secondary);
  margin-bottom: 30px;
}

/* 响应式 */
@media (max-width: 768px) {
  .banner {
    grid-template-columns: 1fr;
  }
  .intro-grid {
    grid-template-columns: 1fr;
  }
  .banner-text h1 {
    font-size: 32px;
  }
}