/* 全局样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* 导航栏 */
.navbar { background: #fff; box-shadow: 0 2px 10px rgba(0,0,0,0.05); padding: 1rem 0; position: sticky; top: 0; z-index: 100; }
.navbar .container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.8rem; font-weight: 700; color: #1a1a1a; text-decoration: none; }
.nav-links { list-style: none; display: flex; gap: 2rem; }
.nav-links a { text-decoration: none; color: #555; font-weight: 500; transition: color 0.3s; }
.nav-links a:hover { color: #e67e22; }

/* 通用标题样式 */
h1, h2, h3 { color: #1a1a1a; margin-bottom: 1rem; }

/* 按钮样式 */
.btn { display: inline-block; background: #e67e22; color: #fff; padding: 0.8rem 2rem; text-decoration: none; border-radius: 5px; font-weight: 600; border: none; cursor: pointer; transition: background 0.3s; }
.btn:hover { background: #d35400; }

/* 页脚 */
.footer { background: #1a1a1a; color: #fff; text-align: center; padding: 2rem 0; margin-top: 3rem; }
.footer p { color: #ccc; }