body { font-family: Arial, sans-serif; background-color: #e8f8ff; }
.container { padding: 20px; }
.task, .subtask, .comment { margin: 10px; padding: 10px; border-radius: 5px; background: #fff; }
.task { border: 2px solid #888; }
.subtask { border: 2px solid #3498db; background: #f2f9ff; margin-left: 30px; }
.comment { font-size: 0.9em; background: #f8f8f8; border-left: 5px solid #ccc; }
.comment.client { border-left-color: red; background: #fdd; }
.comment.user { border-left-color: blue; background: #ddf; }
form { margin: 10px; }
input, textarea, select, button { display: block; margin-top: 5px; }