*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh}#app{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.container{width:100%;max-width:600px}.title{color:#fff;text-align:center;font-size:28px;margin-bottom:40px;text-shadow:2px 2px 4px rgba(0,0,0,.2)}.difficulty-selection{display:flex;flex-direction:column;gap:20px}.difficulty-btn{padding:30px;font-size:20px;color:#fff;border:none;border-radius:15px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #0003;font-weight:600}.difficulty-btn.easy{background:linear-gradient(135deg,#5fa3d0,#4a90e2)}.difficulty-btn.medium{background:linear-gradient(135deg,#6ba3d0,#5890e2)}.difficulty-btn.hard{background:linear-gradient(135deg,#7ba3d0,#6890e2)}.difficulty-btn:hover{transform:translateY(-3px);box-shadow:0 6px 20px #0000004d}.difficulty-btn:active{transform:translateY(-1px)}.modal-overlay{position:fixed;inset:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.modal-content{background:#fff;padding:30px;border-radius:15px;max-width:500px;width:100%;box-shadow:0 10px 40px #0000004d}.modal-content h2{text-align:center;margin-bottom:25px;color:#333;font-size:24px}.modal-content h3{margin-bottom:20px;color:#333;font-size:18px;line-height:1.6}.type-options{display:flex;flex-direction:column;gap:15px;margin-bottom:20px}.type-btn{padding:15px;font-size:18px;background:#4a90e2;color:#fff;border:none;border-radius:10px;cursor:pointer;transition:all .3s ease}.type-btn:hover{background:#357abd;transform:translateY(-2px)}.options{margin:20px 0}.option-item{margin:12px 0;padding:12px;background:#f5f5f5;border-radius:8px;transition:background .2s ease}.option-item:hover{background:#e8e8e8}.option-item label{display:flex;align-items:center;cursor:pointer;font-size:16px;color:#333}.option-item input[type=radio],.option-item input[type=checkbox]{margin-right:12px;width:18px;height:18px;cursor:pointer}.modal-actions{display:flex;gap:10px;margin-top:25px}.submit-btn{flex:1;padding:12px;font-size:16px;background:#4caf50;color:#fff;border:none;border-radius:8px;cursor:pointer;transition:all .3s ease;font-weight:600}.submit-btn:hover{background:#45a049;transform:translateY(-2px)}.close-btn{flex:1;padding:12px;font-size:16px;background:#f44336;color:#fff;border:none;border-radius:8px;cursor:pointer;transition:all .3s ease;font-weight:600}.close-btn:hover{background:#da190b;transform:translateY(-2px)}.result-overlay{position:fixed;inset:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:2000}.result-content{background:#fff;padding:40px;border-radius:15px;text-align:center;box-shadow:0 10px 40px #0000004d;min-width:300px}.result-content h2{margin-bottom:25px;font-size:28px;color:#333}.loading{text-align:center;padding:40px;font-size:18px;color:#666}.question-modal{max-width:700px;max-height:80vh;overflow-y:auto}.fill-inputs{margin:20px 0}.fill-item{margin:15px 0;display:flex;align-items:center;gap:10px}.fill-item label{font-size:16px;color:#333;font-weight:500;min-width:80px}.fill-input{flex:1;padding:10px 15px;font-size:16px;border:2px solid #ddd;border-radius:8px;transition:border-color .3s ease}.fill-input:focus{outline:none;border-color:#4a90e2;box-shadow:0 0 0 3px #4a90e21a}.fill-input::placeholder{color:#999}@media(max-width:768px){.title{font-size:22px;margin-bottom:30px}.difficulty-btn{padding:20px;font-size:18px}.modal-content{padding:20px}.modal-content h2{font-size:20px}.modal-content h3{font-size:16px}.fill-item{flex-direction:column;align-items:flex-start}.fill-item label{min-width:auto}.fill-input{width:100%}}.question-number-modal{max-width:600px;max-height:80vh;overflow-y:auto}.question-numbers{display:grid;grid-template-columns:repeat(auto-fill,minmax(60px,1fr));gap:12px;margin:25px 0}.question-number-btn{padding:15px;font-size:18px;font-weight:600;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:10px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 6px #0000001a}.question-number-btn:hover:not(:disabled){transform:translateY(-3px);box-shadow:0 6px 12px #0003}.question-number-btn:active:not(:disabled){transform:translateY(-1px)}.question-number-btn.answered{background:#9e9e9e;cursor:not-allowed;opacity:.5}.question-number-btn:disabled{cursor:not-allowed}