body { font-family: sans-serif; max-width: 900px; margin: 0 auto; padding: 15px; background: #eee; }
nav { background: #333; padding: 10px; color: white; border-radius: 5px; }
nav a { color: #fff; text-decoration: none; }
.thread-card { background: #fff; padding: 15px; margin: 10px 0; border-radius: 5px; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
.post { background: #fff; padding: 15px; border: 1px solid #ccc; border-radius: 5px; margin-bottom: 10px; }
.admin-reply { border-left: 6px solid #4CAF50; background: #f9fff9; }
textarea { width: 100%; height: 120px; }
.btn { background: #007bff; color: #fff; padding: 8px 15px; border: none; border-radius: 4px; cursor: pointer; text-decoration: none; display: inline-block; }
img { max-width: 100%; border-radius: 5px; }