/* 全局样式 */
:root { --primary: #2e7d32; --bg: #f4f7f6; --text: #333; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; line-height: 1.6; margin: 0; color: var(--text); background: var(--bg); }
header { background: #fff; box-shadow: 0 2px 10px rgba(0,0,0,0.05); padding: 1rem 0; position: sticky; top: 0; z-index: 100; }
nav { display: flex; justify-content: space-around; align-items: center; max-width: 1000px; margin: auto; padding: 0 20px; }
.logo { font-size: 1.5rem; font-weight: bold; color: var(--primary); text-decoration: none; }
nav ul { display: flex; list-style: none; margin: 0; padding: 0; }
nav ul li { margin-left: 25px; }
nav a { text-decoration: none; color: #555; font-weight: 500; transition: 0.3s; }
nav a:hover { color: var(--primary); }
.container { max-width: 800px; margin: 40px auto; padding: 0 20px; min-height: 70vh; }
h1, h2 { color: #222; }
/* 列表与卡片 */
.post-item { background: #fff; padding: 25px; border-radius: 12px; margin-bottom: 20px; box-shadow: 0 2px 5px rgba(0,0,0,0.03); border: 1px solid #eee; }
.post-item h3 { margin-top: 0; }
.btn { display: inline-block; background: var(--primary); color: #fff; padding: 10px 20px; border-radius: 5px; text-decoration: none; margin-top: 10px; }
/* 页脚 */
footer { text-align: center; padding: 40px; background: #fff; color: #888; font-size: 0.9rem; border-top: 1px solid #eee; }
input, textarea { width: 100%; padding: 12px; margin: 10px 0; border: 1px solid #ddd; border-radius: 5px; box-sizing: border-box; }