*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{color:#333;-webkit-text-size-adjust:100%;-moz-text-size-adjust:100%;text-size-adjust:100%;background-color:#f5f5f5;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;line-height:1.6}.app{flex-direction:column;min-height:100vh;padding:0 16px;display:flex}.app-header{text-align:center;width:100%;max-width:640px;margin:0 auto;padding:16px 0 24px}.app-header-content{cursor:pointer}.app-header h1{color:#1a1a1a;letter-spacing:-.02em;font-size:1.75rem;font-weight:800}.app-subtitle{color:#777;margin-top:4px;font-size:.938rem}main{flex:1;width:100%;max-width:640px;margin:0 auto}.app-footer{text-align:center;color:#999;padding:40px 0 24px;font-size:.813rem}.hidden{display:none!important}.card{background:#fff;border:1px solid #e5e5e5;border-radius:16px;padding:24px}.btn{cursor:pointer;text-align:center;border:none;border-radius:10px;padding:12px 24px;font-size:.938rem;font-weight:600;transition:all .2s;display:inline-block}.btn-dark{color:#fff;background:#1a1a1a}.btn-dark:hover{background:#333}.btn-outline{color:#1a1a1a;background:#fff;border:1px solid #d0d0d0}.btn-outline:hover{background:#f5f5f5;border-color:#bbb}.btn-primary{color:#fff;background:#1a1a1a}.btn-primary:hover{background:#333}.btn-secondary{color:#333;background:#f5f5f5;border:1px solid #d0d0d0}.btn-secondary:hover{background:#eee}.btn-danger{color:#e53935;background:#fff;border:1px solid #ffcdd2;width:100%;font-weight:500}.btn-danger:hover{background:#ffebee;border-color:#ef9a9a}.btn:focus-visible,.option-btn:focus-visible,.settings-button:focus-visible,.auth-button:focus-visible,.sign-out-button:focus-visible,.exit-button:focus-visible,.close-button:focus-visible{outline-offset:2px;outline:2px solid #1a1a1a}.app-header-content:focus-visible{outline-offset:4px;border-radius:8px;outline:2px solid #1a1a1a}.header-actions{justify-content:flex-end;align-items:center;gap:8px;min-height:32px;display:flex}.auth-button{color:#1a1a1a;cursor:pointer;white-space:nowrap;background:#fff;border:1px solid #d0d0d0;border-radius:8px;padding:6px 14px;font-size:.813rem;font-weight:600;transition:all .2s}.auth-button:hover{background:#f5f5f5;border-color:#bbb}.user-info{align-items:center;gap:8px;display:flex}.user-email{color:#777;text-overflow:ellipsis;white-space:nowrap;max-width:120px;font-size:.75rem;overflow:hidden}.sign-out-button{color:#999;cursor:pointer;background:0 0;border:none;border-radius:4px;padding:2px 6px;font-size:.75rem;transition:all .2s}.sign-out-button:hover{color:#333;background:#f0f0f0}.auth-tabs{border-bottom:1px solid #eee;gap:0;margin-bottom:16px;display:flex}.auth-tab{color:#999;cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;flex:1;padding:10px;font-size:.875rem;font-weight:600;transition:all .2s}.auth-tab.active{color:#1a1a1a;border-bottom-color:#1a1a1a}.auth-tab:hover:not(.active){color:#555}.form-input{border:1px solid #d0d0d0;border-radius:8px;width:100%;padding:10px 12px;font-family:inherit;font-size:.875rem;transition:border-color .2s}.form-input:focus{border-color:#1a1a1a;outline:none}.auth-submit-btn{width:100%;margin-top:4px}.auth-error{color:#e53935;margin:8px 0;font-size:.813rem}.auth-switch{text-align:center;color:#777;margin-top:16px;font-size:.813rem}.auth-switch-link{color:#1a1a1a;cursor:pointer;background:0 0;border:none;padding:0;font-size:.813rem;font-weight:600;text-decoration:underline}.auth-switch-link:hover{color:#555}.auth-divider{color:#999;align-items:center;margin:16px 0;font-size:.813rem;display:flex}.auth-divider:before,.auth-divider:after{content:"";background:#eee;flex:1;height:1px}.auth-divider span{padding:0 12px}.google-btn{justify-content:center;align-items:center;gap:8px;width:100%;padding:10px 24px;display:flex}.google-btn svg{flex-shrink:0}.sync-status{color:#999;text-align:center;margin-top:8px;font-size:.75rem}.settings-button{color:#666;cursor:pointer;background:#fff;border:1px solid #e5e5e5;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;padding:8px;transition:all .2s;display:flex}.settings-button:hover{color:#333;background:#f5f5f5}.settings-button svg{width:20px;height:20px}dialog{border:1px solid #e5e5e5;border-radius:12px;width:90%;max-width:400px;margin:auto;padding:0;box-shadow:0 8px 30px #0000001f}dialog::backdrop{background-color:#0006}.dialog-header{border-bottom:1px solid #eee;justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.dialog-header h2{color:#1a1a1a;margin:0;font-size:1.125rem}.dialog-content{padding:20px}.dialog-actions{background:#fafafa;border-top:1px solid #eee;border-radius:0 0 12px 12px;justify-content:flex-end;gap:8px;padding:12px 20px;display:flex}.close-button{cursor:pointer;color:#999;background:0 0;border:none;border-radius:4px;padding:4px 8px;font-size:1.5rem;line-height:1}.close-button:hover{color:#333;background:#f0f0f0}.form-group{margin-bottom:20px}.form-group label{color:#555;margin-bottom:8px;font-size:.875rem;font-weight:600;display:block}.exam-questions-group{margin-top:16px}.slider{width:100%;margin:8px 0}.reset-section{background:#fafafa;border:1px solid #eee;border-radius:8px;margin-top:20px;padding:16px}.reset-content h3{color:#1a1a1a;margin:0 0 4px;font-size:.938rem;font-weight:600}.reset-description{color:#777;margin:0 0 12px;font-size:.813rem;line-height:1.5}.welcome-header{justify-content:space-between;align-items:flex-start;margin-bottom:4px;display:flex}.welcome-title{color:#1a1a1a;margin:0;font-size:1.25rem;font-weight:700}.welcome-subtitle{color:#888;margin-top:4px;font-size:.875rem}.learning-progress-section{background:#f9f9f9;border-radius:10px;margin:20px 0;padding:16px}.learning-progress-header{justify-content:space-between;align-items:center;margin-bottom:10px;display:flex}.learning-progress-label{color:#1a1a1a;font-size:.938rem;font-weight:700}.learning-progress-count{color:#777;font-size:.813rem;font-weight:500}.progress-bar-track{background:#e5e5e5;border-radius:4px;width:100%;height:8px;overflow:hidden}.progress-bar-fill{background:#1a1a1a;border-radius:4px;width:0%;height:100%;transition:width .4s}.mode-grid{grid-template-columns:1fr 1fr;gap:12px;margin-top:20px;display:grid}.mode-card{border:1px solid #e5e5e5;border-radius:12px;flex-direction:column;padding:20px;display:flex}.mode-card-title{color:#1a1a1a;align-items:center;gap:8px;margin-bottom:8px;font-size:1rem;font-weight:700;display:flex}.mode-icon{flex-shrink:0}.mode-card-desc{color:#777;flex:1;margin-bottom:16px;font-size:.813rem;line-height:1.5}.mode-card .btn{width:100%;padding:10px 16px;font-size:.875rem}.quiz-progress-header{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.quiz-progress-label,.quiz-progress-count{color:#777;font-size:.813rem;font-weight:500}.question-card{margin-top:20px;position:relative}.exit-button{cursor:pointer;color:#bbb;background:0 0;border:none;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:20px;transition:all .2s;display:flex;position:absolute;top:12px;right:12px}.exit-button:hover{color:#666;background:#f5f5f5}.question-text{color:#1a1a1a;margin-bottom:20px;padding-right:32px;font-size:1.125rem;font-weight:600;line-height:1.5}.options{flex-direction:column;gap:10px;display:flex}.option-btn{cursor:pointer;text-align:left;color:#333;background:#fff;border:2px solid #e5e5e5;border-radius:12px;align-items:center;gap:12px;width:100%;padding:14px 16px;font-family:inherit;font-size:.938rem;line-height:1.4;transition:border-color .2s;display:flex}.option-btn:hover:not(:disabled){background:#fafafa;border-color:#ccc}.option-btn:disabled{cursor:default}.option-radio{border:2px solid #d0d0d0;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:24px;min-width:24px;height:24px;transition:all .2s;display:flex}.option-text{flex:1}.option-btn.correct{background:#f1f9f1;border-color:#4caf50}.option-btn.correct .option-radio{color:#fff;background:#4caf50;border-color:#4caf50}.option-btn.correct .option-text{color:#2e7d32;font-weight:600}.option-btn.incorrect{background:#fef5f5;border-color:#e53935}.option-btn.incorrect .option-radio{color:#fff;background:#e53935;border-color:#e53935}.option-btn.incorrect .option-text{color:#c62828;font-weight:600}.feedback-section{background:#f9f9f9;border-radius:10px;margin-top:20px;padding:16px}.result-text{margin-bottom:8px;font-size:.938rem;font-weight:700}.result-text.correct{color:#4caf50}.result-text.incorrect{color:#e53935}.explanation-text{color:#666;font-size:.875rem;line-height:1.6}.next-step{justify-content:flex-end;margin-top:20px;display:flex}.next-step .btn{min-width:160px}.results-card{text-align:center;padding:40px 24px}.results-title{color:#1a1a1a;margin-bottom:24px;font-size:1.5rem;font-weight:800}.score-circle-wrapper{width:160px;height:160px;margin:0 auto 24px;position:relative}.score-circle{width:100%;height:100%;transform:rotate(-90deg)}.score-bg{fill:none;stroke:#e8e8e8;stroke-width:8px}.score-fill{fill:none;stroke:#1a1a1a;stroke-width:8px;stroke-linecap:round;stroke-dasharray:314.16;stroke-dashoffset:314.16px;transition:stroke-dashoffset .8s}.score-percentage{color:#1a1a1a;font-size:2.5rem;font-weight:800;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.final-score{color:#1a1a1a;margin-bottom:8px;font-size:1.063rem;font-weight:600}.score-message{color:#777;margin-bottom:24px;font-size:.875rem}.total-score{color:#999;margin-bottom:24px;font-size:.813rem}.results-btn{min-width:200px;padding:14px 32px}@media (width>=768px){.app-header h1{font-size:2.25rem}.app-subtitle{font-size:1rem}.card{padding:32px}.question-text{font-size:1.25rem}.option-btn{padding:16px 20px;font-size:1rem}.results-card{padding:48px 32px}}@media (width<=400px){.mode-grid{grid-template-columns:1fr}.app{padding:0 12px}.score-circle-wrapper{width:130px;height:130px}.score-percentage{font-size:2rem}}@media (width<=480px){dialog{margin:16px auto}}.rule-ref{color:#1a6ecc;cursor:pointer;font:inherit;text-underline-offset:2px;background:0 0;border:none;padding:0;-webkit-text-decoration:underline #a0c0e8;text-decoration:underline #a0c0e8}.rule-ref:hover{color:#0a4a99;text-decoration-color:#0a4a99}.rule-ref:focus-visible{outline-offset:2px;border-radius:2px;outline:2px solid #1a6ecc}#rule-dialog{max-width:720px;margin:auto;padding:0;overflow:hidden}.rule-dialog-body{color:#444;max-height:calc(80vh - 64px);padding:20px;font-size:.875rem;line-height:1.7;overflow-y:auto}.rule-dialog-body p{margin-bottom:.75rem}.rule-dialog-body p:last-child{margin-bottom:0}.rule-table-wrap{-webkit-overflow-scrolling:touch;margin-bottom:.75rem;font-size:.8125rem;overflow-x:auto}.rule-table-wrap:last-child{margin-bottom:0}.rule-table{border-collapse:collapse;width:max-content;min-width:100%;font-size:.8125rem}.rule-table th,.rule-table td{text-align:left;vertical-align:top;border:1px solid #d0d7de;padding:5px 10px;font-size:.8125rem}.rule-table th{white-space:nowrap;background:#f0f4f8;font-weight:600}.rule-table tbody tr:nth-child(2n){background:#f9f9f9}.rule-loading,.rule-not-found,.rule-error{color:#999;font-style:italic}.rule-error{color:#e53935}@media (width<=480px){.rule-dialog-body{max-height:calc(85vh - 64px)}}