*{margin:0;padding:0;box-sizing:border-box}body{font-family:Georgia,serif;line-height:1.6;color:#333;background-color:#fefefe}main{max-width:800px;margin:0 auto;padding:20px}header{text-align:center;margin-bottom:40px;padding-bottom:20px;border-bottom:2px solid #e0e0e0}header h1{font-size:2.5rem;color:#2c3e50;margin-bottom:10px}header p{font-size:1.1rem;color:#666;max-width:600px;margin:0 auto}.guestbook-form{background:#f9f9f9;padding:30px;border-radius:8px;margin-bottom:40px}.guestbook-form h2{color:#2c3e50;margin-bottom:20px;font-size:1.8rem}#post-form{display:flex;flex-direction:column;gap:15px}#post-form input,#post-form textarea{padding:12px;border:2px solid #ddd;border-radius:6px;font-size:1rem;font-family:inherit}#post-form input:focus,#post-form textarea:focus{outline:none;border-color:#3498db}#post-form textarea{min-height:120px;resize:vertical}#post-form button{background:#3498db;color:#fff;padding:12px 24px;border:none;border-radius:6px;font-size:1rem;cursor:pointer;transition:background-color .3s}#post-form button:hover{background:#2980b9}.posts-container{margin-top:40px}.posts-container h2{color:#2c3e50;margin-bottom:20px;font-size:1.8rem;border-bottom:1px solid #e0e0e0;padding-bottom:10px}#posts-list{display:flex;flex-direction:column;gap:20px}.post{background:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 4px #0000001a;border-left:4px solid #3498db}.post-author{font-weight:700;color:#2c3e50;margin-bottom:5px}.post-message{color:#555;margin-bottom:10px;line-height:1.5}.post-image{max-width:100%;height:auto;border-radius:6px;margin-top:10px}.post-date{font-size:.9rem;color:#999;font-style:italic}@media (max-width: 600px){main{padding:15px}header h1{font-size:2rem}.guestbook-form{padding:20px}}
