body { font-family: 'Segoe UI', sans-serif; background: #f4f7f6; margin: 0; padding: 20px; }
.container { max-width: 500px; margin: auto; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
h2 { color: #2c3e50; text-align: center; }
.btn { width: 100%; padding: 12px; border: none; border-radius: 8px; cursor: pointer; font-weight: bold; margin-bottom: 10px; }
.btn-in { background: #27ae60; color: white; }
.btn-out { background: #e74c3c; color: white; }
.form-group { margin-bottom: 15px; }
input, textarea { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 5px; box-sizing: border-box; }