/* 重置样式与基础排版 */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
  line-height: 1.7;
  color: #2c2a29;
  background: linear-gradient(135deg, #8B5E3C 0%, #A26A42 50%, #C08A5B 100%);
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* 头部 */
.header {
  background: rgba(122, 80, 50, 0.95);
  backdrop-filter: blur(10px);
  padding: 14px 0;
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
  position: sticky; top: 0; z-index: 100;
}
.header .container { 
  display: grid; 
  grid-template-columns: auto 1fr; 
  align-items: center; 
  gap: 0.75rem 1rem; 
}
.logo { grid-column: 1; }
.nav { grid-column: 1 / -1; width: 100%; }
.logo {
  color: #FFD26A; font-size: 2rem; font-weight: 700;
  text-shadow: 2px 2px 6px rgba(0,0,0,0.45);
}
.nav ul { 
  display: flex; 
  list-style: none; 
  gap: 0.75rem; 
  flex-wrap: wrap; 
  justify-content: center; 
}
.nav a {
  color: #FFF2D5; text-decoration: none; font-weight: 600;
  padding: 6px 10px; border-radius: 6px; transition: all .25s ease;
  font-size: 0.95rem;
}
.nav a:hover { background: rgba(255, 210, 106, .2); color: #FFD26A; transform: translateY(-2px); }

/* 主内容 */
.main { padding: 2.5rem 0; }
.hero {
  text-align: center; padding: 4rem 0; margin: 2rem 0;
  background: rgba(255, 242, 213, 0.08); border-radius: 16px; backdrop-filter: blur(6px);
}
.hero h2 { color: #FFD26A; font-size: 2.6rem; margin-bottom: .75rem; text-shadow: 1px 2px 5px rgba(0,0,0,.35); }
.intro { color: #FFF2D5; font-size: 1.08rem; max-width: 880px; margin: 0 auto; line-height: 1.9; }

/* 功能模块 */
.features { padding: 3.5rem 0; }
.features h3 { text-align: center; color: #FFD26A; font-size: 2.2rem; margin-bottom: 2rem; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.feature-item {
  background: rgba(255, 242, 213, .10);
  padding: 1.5rem; border-radius: 12px; text-align: center; border: 1px solid rgba(255, 210, 106, .25);
  transition: transform .25s ease, box-shadow .25s ease;
}
.feature-item:hover { transform: translateY(-4px); box-shadow: 0 12px 28px rgba(0,0,0,.25); }
.feature-item h4 { color: #FFD26A; font-size: 1.22rem; margin-bottom: .5rem; }
.feature-item p { color: #FFF2D5; }

/* CTA */
.cta {
  text-align: center; padding: 3rem 1rem; margin: 2rem 0; border-radius: 16px; background: rgba(122, 80, 50, .9);
}
.cta h3 { color: #FFD26A; font-size: 2.1rem; margin-bottom: .75rem; }
.cta p { color: #FFF2D5; font-size: 1.05rem; margin-bottom: 1.5rem; }
.download-btn {
  background: linear-gradient(45deg, #FFD26A, #FFAD5B);
  color: #5c3b26; padding: .9rem 2.2rem; font-size: 1.08rem; font-weight: 700;
  border: none; border-radius: 999px; cursor: pointer; transition: all .25s ease;
  box-shadow: 0 8px 24px rgba(255, 210, 106, .45);
}
.download-btn:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(255, 210, 106, .6); }

/* 页脚 */
.footer { background: rgba(122, 80, 50, .95); color: #FFF2D5; text-align: center; padding: 1.6rem 0; margin-top: 3rem; }
.footer a { color: #FFD26A; text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* 响应式 */
@media (max-width: 920px) {
  .logo { font-size: 1.8rem; }
  .hero h2 { font-size: 2.2rem; }
}
@media (max-width: 640px) {
  .header .container { flex-direction: column; gap: .75rem; }
  .nav ul { justify-content: center; }
  .feature-grid { grid-template-columns: 1fr; }
}