/* 老人头菌 - 浅灰+棕色主题，朴实菌菇风格 */
:root {
  --primary: #7a6a5a;
  --primary-light: #9a8a7a;
  --secondary: #5a4a3a;
  --accent: #8a7a6a;
  --bg: #f5f4f2;
  --bg-alt: #ece8e2;
  --text: #2c2c2c;
  --text-light: #555;
  --white: #ffffff;
  --border: #d8d0c4;
  --earth: #3a2a1a;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.site-header {
  background: linear-gradient(135deg, #7a7a7a 0%, #9a9a9a 100%);
  color: var(--white);
  padding: 30px 0;
  text-align: center;
}
.site-header .logo { font-size: 2rem; font-weight: 700; margin-bottom: 8px; }
.site-header .tagline { font-size: 1rem; opacity: 0.9; }

.main-nav {
  background: var(--earth);
  position: sticky;
  top: 0;
  z-index: 100;
}
.main-nav ul { list-style: none; display: flex; justify-content: center; gap: 30px; padding: 12px 0; }
.main-nav a { color: var(--white); text-decoration: none; font-size: 0.95rem; transition: opacity 0.3s; }
.main-nav a:hover { opacity: 0.8; }

.hero {
  background: linear-gradient(to bottom, var(--bg-alt), var(--bg));
  padding: 60px 0;
  border-bottom: 3px solid var(--primary-light);
}
.hero .container { display: flex; align-items: center; gap: 40px; }
.hero-content { flex: 1; }
.hero-content h2 { font-size: 2.2rem; color: var(--primary); margin-bottom: 15px; }
.hero-content p { font-size: 1.05rem; color: var(--text-light); margin-bottom: 20px; }
.hero-image { flex-shrink: 0; width: 160px; height: 160px; background: var(--primary-light); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 5rem; }

.btn { display: inline-block; background: var(--primary); color: var(--white); padding: 12px 30px; border-radius: 6px; text-decoration: none; font-weight: 600; transition: background 0.3s; }
.btn:hover { background: var(--secondary); }

.features { padding: 50px 0; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 25px; }
.feature-card { background: var(--white); padding: 30px; border-radius: 10px; text-align: center; border: 1px solid var(--border); transition: box-shadow 0.3s; }
.feature-card:hover { box-shadow: 0 4px 20px rgba(122,106,90,0.15); }
.feature-icon { font-size: 2.5rem; margin-bottom: 15px; }
.feature-card h3 { color: var(--primary); margin-bottom: 10px; }

.products { background: var(--bg-alt); padding: 50px 0; border-top: 2px solid var(--border); border-bottom: 2px solid var(--border); }
.section-title { text-align: center; font-size: 1.8rem; color: var(--primary); margin-bottom: 35px; }
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 25px; }
.product-card { background: var(--white); padding: 25px; border-radius: 10px; text-align: center; border: 1px solid var(--border); }
.product-img { font-size: 3.5rem; margin-bottom: 15px; }
.product-card h3 { color: var(--text); margin-bottom: 8px; }
.price { font-size: 1.3rem; color: var(--primary); font-weight: 700; margin: 10px 0; }
.desc { color: var(--text-light); font-size: 0.9rem; margin-bottom: 15px; }
.btn-small { display: inline-block; background: var(--secondary); color: var(--white); padding: 8px 20px; border-radius: 5px; text-decoration: none; font-size: 0.9rem; transition: background 0.3s; }
.btn-small:hover { background: var(--earth); }

.about { padding: 50px 0; }
.about-content { max-width: 800px; margin: 0 auto; text-align: center; }
.about-content p { color: var(--text-light); margin-bottom: 15px; font-size: 1rem; }

.site-footer { background: var(--secondary); color: var(--white); padding: 40px 0 0; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 30px; margin-bottom: 30px; }
.footer-col h4 { margin-bottom: 15px; color: #c9b89e; }
.footer-col p, .footer-col li { font-size: 0.9rem; opacity: 0.85; margin-bottom: 8px; list-style: none; }
.footer-col a { color: var(--white); text-decoration: none; opacity: 0.85; }
.footer-col a:hover { opacity: 1; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.15); padding: 15px 0; text-align: center; font-size: 0.85rem; opacity: 0.7; }

@media (max-width: 768px) {
  .hero .container { flex-direction: column-reverse; text-align: center; }
  .hero-image { width: 120px; height: 120px; font-size: 3.5rem; }
  .hero-content h2 { font-size: 1.6rem; }
  .main-nav ul { gap: 15px; flex-wrap: wrap; justify-content: center; }
  .site-header .logo { font-size: 1.5rem; }
}