:root{--primary-color: #FF0000;--primary-hover: #CC0000;--secondary-color: #00FF00;--error-color: #FF0000;--background-dark: #000000;--surface-dark: #0a0a0a;--text-primary: #ffffff;--text-secondary: #a3a3a3;--border-color: #333333;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;line-height:1.5;font-weight:400;color-scheme:dark;color:var(--text-primary);background-color:var(--background-dark);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh;background:radial-gradient(circle at top center,#300,#000)}#root{width:100%;margin:0 auto;text-align:center}button{cursor:pointer}.app-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;width:100%;padding:2rem;box-sizing:border-box}h1,h2,h3{color:var(--text-primary);margin-top:0}h1{font-size:3.5rem;font-weight:800;background:linear-gradient(to right,red,#ff4d4d);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:1rem;letter-spacing:-.02em;text-shadow:0 0 20px rgba(255,0,0,.3)}h2{font-size:2rem;margin-bottom:1.5rem}p{color:var(--text-secondary);font-size:1.1rem;line-height:1.6}.landing-page{max-width:800px;animation:fadeIn .8s ease-out}.landing-page p{font-size:1.25rem;margin-bottom:2.5rem;max-width:600px;margin-left:auto;margin-right:auto}.landing-page p.subtitle{font-size:1.25rem;margin-bottom:3rem;max-width:600px;margin-left:auto;margin-right:auto;color:var(--text-secondary)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin-bottom:3rem;text-align:left}.feature-card{background:#ffffff08;border:1px solid rgba(255,0,0,.1);padding:1.5rem;border-radius:12px;transition:transform .2s,border-color .2s}.feature-card:hover{transform:translateY(-5px);border-color:var(--primary-color);background:#ff00000d}.feature-card h3{font-size:1.2rem;margin-bottom:.5rem;color:var(--primary-color);text-shadow:none}.feature-card p{font-size:.95rem;margin-bottom:0;color:var(--text-secondary);max-width:100%}.primary-btn{background:linear-gradient(135deg,var(--primary-color),var(--primary-hover));color:#fff;padding:1rem 2.5rem;font-size:1.1rem;font-weight:600;border:none;border-radius:50px;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 15px #f006}.primary-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #f009}.primary-btn:active{transform:translateY(0)}.card-glass{background:#0a0a0acc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,0,0,.2);border-radius:16px;padding:2.5rem;box-shadow:0 10px 30px #00000080}.quiz-page{width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center}.quiz-form-container{width:100%;max-width:450px;margin:0 auto;text-align:center;animation:slideUp .5s ease-out}.form-group{margin-bottom:1.5rem;text-align:left}.form-group label{display:block;margin-bottom:.5rem;font-weight:500;color:var(--text-primary);font-size:.95rem}.form-group input{width:100%;padding:.8rem 1rem;border-radius:8px;border:1px solid var(--border-color);background:#0009;color:#fff;font-size:1rem;transition:border-color .2s,box-shadow .2s;box-sizing:border-box}.form-group input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #f003}.form-group select{width:100%;padding:.8rem 1rem;border-radius:8px;border:1px solid var(--border-color);background:#0009;color:#fff;font-size:1rem;transition:border-color .2s,box-shadow .2s;box-sizing:border-box;appearance:none;background-image:url(data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23FFFFFF%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E);background-repeat:no-repeat;background-position:right 1rem top 50%;background-size:.65rem auto}.form-group select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #f003}.form-group select option{background:#1a1a1a;color:#fff}.start-btn{width:100%;padding:1rem;background:var(--primary-color);color:#fff;border:none;border-radius:8px;font-size:1.1rem;font-weight:600;margin-top:1rem;transition:all .2s}.start-btn:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-1px)}.start-btn:disabled{background:var(--border-color);cursor:not-allowed;opacity:.7}.quiz-game{width:100%;max-width:700px;margin:0 auto;animation:fadeIn .5s ease-out}.question-section{margin-bottom:2.5rem}.question-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--border-color)}.question-count{font-size:.9rem;color:var(--text-secondary);font-weight:500;text-transform:uppercase;letter-spacing:.05em}.score-badge{background:#10b9811a;color:var(--secondary-color);padding:.25rem .75rem;border-radius:20px;font-size:.9rem;font-weight:600}.question-text{font-size:1.5rem;font-weight:600;line-height:1.4;color:var(--text-primary)}.answer-section{display:grid;gap:1rem}.answer-btn{width:100%;padding:1.2rem 1.5rem;text-align:left;background:#ffffff0d;border:1px solid rgba(255,255,255,.1);border-radius:12px;color:var(--text-primary);font-size:1.05rem;transition:all .2s;position:relative;overflow:hidden}.answer-btn:hover:not(:disabled){background:#ffffff1a;border-color:#ffffff4d;transform:translate(4px)}.answer-btn.selected{background:#fff;border-color:#fff;color:#000;font-weight:700;transform:scale(1.01);box-shadow:0 0 15px #fff3}.answer-btn.correct{background:#10b9811a;border-color:var(--secondary-color);color:var(--secondary-color)}.answer-btn.incorrect{background:#ef44441a;border-color:var(--error-color);color:var(--error-color);opacity:.7}.controls{margin-top:2.5rem;display:flex;justify-content:flex-end}.control-btn{padding:.8rem 2rem;background:var(--primary-color);color:#fff;border:none;border-radius:8px;font-weight:600;font-size:1rem;transition:all .2s}.control-btn:hover:not(:disabled){background:var(--primary-hover);box-shadow:0 4px 12px #ff00004d}.control-btn:disabled{background:var(--border-color);cursor:not-allowed;opacity:.5}.back-btn{position:absolute;top:20px;left:20px;background:transparent;border:1px solid rgba(255,255,255,.2);color:var(--text-secondary);padding:.5rem 1rem;font-size:.9rem;border-radius:8px;transition:all .2s}.back-btn:hover{background:#ffffff1a;color:var(--text-primary);border-color:var(--text-primary)}.share-btn{width:100%;padding:.8rem;background:transparent;border:1px solid var(--primary-color);color:var(--primary-color);border-radius:8px;font-size:1rem;font-weight:600;margin-top:1rem;cursor:pointer;transition:all .2s}.share-btn:hover:not(:disabled){background:#ff00001a;box-shadow:0 0 10px #f003}.share-btn:disabled{border-color:var(--border-color);color:var(--text-secondary);cursor:not-allowed}.score-section{text-align:center;padding:3rem 2rem;animation:scaleIn .5s cubic-bezier(.175,.885,.32,1.275)}.score-circle{width:150px;height:150px;border-radius:50%;background:conic-gradient(var(--primary-color) var(--score-percent),var(--surface-dark) 0);margin:0 auto 2rem;display:flex;align-items:center;justify-content:center;position:relative}.score-circle:before{content:"";position:absolute;width:130px;height:130px;background:var(--background-dark);border-radius:50%}.score-text{position:relative;z-index:1;font-size:2.5rem;font-weight:800;color:var(--text-primary)}.score-message{font-size:1.5rem;margin-bottom:2rem;color:var(--text-secondary)}.error-message{background:#ef44441a;border:1px solid var(--error-color);color:#fca5a5;padding:1rem;border-radius:8px;margin-bottom:1.5rem;display:flex;align-items:center;gap:.5rem}.modal-overlay{position:fixed;inset:0;background:#000c;display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .2s ease-out}.modal-content{width:90%;max-width:500px;text-align:center;animation:scaleIn .2s ease-out}.modal-content h3{font-size:1.8rem;margin-bottom:1rem}.url-box{display:flex;gap:10px;margin:1.5rem 0}.url-box input{flex:1;padding:.8rem;border-radius:8px;border:1px solid var(--border-color);background:#0009;color:var(--text-secondary);font-family:monospace}.copy-btn{padding:0 1.5rem;background:var(--primary-color);color:#fff;border:none;border-radius:8px;font-weight:600;transition:all .2s}.copy-btn:hover{background:var(--primary-hover)}.close-btn{background:transparent;border:1px solid var(--border-color);color:var(--text-secondary);padding:.8rem 2rem;border-radius:8px;cursor:pointer;transition:all .2s}.close-btn:hover{background:#ffffff1a;color:var(--text-primary)}.link-box{display:flex;gap:.5rem;margin:1.5rem 0}.link-box input{flex:1;padding:.5rem;border-radius:4px;border:1px solid rgba(255,255,255,.2);background:#0000004d;color:var(--text-primary)}.close-btn-full{width:100%;padding:.75rem;background:transparent;border:1px solid rgba(255,255,255,.2);color:var(--text-primary);border-radius:6px;cursor:pointer;margin-top:1rem}.close-btn-full:hover{background:#ffffff1a}.how-it-works{margin:4rem 0;text-align:center}.how-it-works h2{font-size:2rem;margin-bottom:2rem;color:var(--text-primary)}.steps-container{display:flex;justify-content:center;gap:2rem;flex-wrap:wrap}.step{display:flex;flex-direction:column;align-items:center;max-width:200px}.step-number{width:50px;height:50px;background:var(--primary-color);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700;margin-bottom:1rem;box-shadow:0 0 15px #f006}.step p{font-size:1rem;color:var(--text-secondary);line-height:1.4}.mini-quiz-btn{position:fixed;top:20px;right:20px;padding:.6rem 1.2rem;font-size:.9rem;font-weight:600;background:#00000080;border:1px solid var(--primary-color);color:var(--primary-color);border-radius:20px;cursor:pointer;transition:all .2s;z-index:100;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.mini-quiz-btn:hover{background:var(--primary-color);color:#fff;box-shadow:0 0 15px #f006;transform:translateY(-1px)}.landing-header{display:flex;justify-content:space-between;width:100%;margin-bottom:2rem}.teacher-btn{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:var(--text-primary);padding:.5rem 1rem;border-radius:8px;cursor:pointer;transition:all .3s ease}.teacher-btn:hover{background:#f003;border-color:var(--primary-color)}.auth-page,.dashboard-page,.classroom-page,.student-test-page{width:100%;max-width:1000px;margin:0 auto}.auth-form{display:flex;flex-direction:column;gap:1.5rem;max-width:400px;margin:0 auto;padding:2rem}.dashboard-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.logout-btn,.back-btn-nav{background:transparent;border:1px solid rgba(255,255,255,.2);color:var(--text-secondary);padding:.5rem 1rem;border-radius:6px;cursor:pointer}.logout-btn:hover,.back-btn-nav:hover{background:#ffffff1a;color:var(--text-primary)}.classrooms-grid,.tests-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem;margin-top:2rem}.classroom-card,.test-card{padding:1.5rem;cursor:pointer;transition:transform .2s,border-color .2s;display:flex;flex-direction:column;justify-content:space-between;min-height:150px}.classroom-card:hover,.test-card:hover{transform:translateY(-5px);border-color:var(--primary-color)}.add-classroom-card{display:flex;align-items:center;justify-content:center;border:2px dashed rgba(255,255,255,.2);background:#0003}.add-btn{font-size:3rem;color:var(--text-secondary);background:none;border:none;cursor:pointer}.modal-overlay{position:fixed;inset:0;background:#000c;display:flex;align-items:center;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.modal-content{width:90%;max-width:500px;padding:2rem}.modal-actions{display:flex;justify-content:flex-end;gap:1rem;margin-top:1.5rem}.cancel-btn{background:transparent;border:none;color:var(--text-secondary);cursor:pointer}.test-actions{display:flex;gap:.5rem;margin-top:1rem}.action-btn{flex:1;padding:.5rem;font-size:.9rem;background:#ffffff1a;border:none;border-radius:4px;color:var(--text-primary);cursor:pointer}.action-btn:hover{background:var(--primary-color)}.action-btn.secondary{background:transparent;border:1px solid rgba(255,255,255,.2)}.results-section{margin-top:3rem;padding:2rem}.results-table{width:100%;border-collapse:collapse;margin-top:1rem}.results-table th,.results-table td{text-align:left;padding:1rem;border-bottom:1px solid rgba(255,255,255,.1)}.results-table th{color:var(--text-secondary);font-weight:600}.welcome-card{max-width:500px;margin:4rem auto;padding:3rem;text-align:center}.name-form{margin-top:2rem;display:flex;flex-direction:column;gap:1.5rem}.create-class-section{padding:2rem;margin-bottom:3rem;display:flex;flex-direction:column;align-items:center;text-align:center}.create-class-section h3{margin-bottom:1.5rem;font-size:1.5rem}.create-class-form{display:flex;gap:1rem;width:100%;max-width:600px}.create-class-form input{flex:1;padding:.8rem 1rem;border-radius:8px;border:1px solid rgba(255,255,255,.2);background:#0000004d;color:var(--text-primary);font-size:1rem;transition:border-color .3s}.create-class-form input:focus{border-color:var(--primary-color);outline:none}.create-class-form button{white-space:nowrap;padding:0 2rem}.create-class-form input::placeholder{color:#ffffff80}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}.user-info{display:flex;align-items:center;gap:1.5rem}.user-info span{color:var(--text-secondary);font-size:.9rem}.dashboard-content{animation:fadeIn .5s ease-out}