:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overscroll-behavior-y:contain;--color-success: rgb(115, 211, 115);--color-error: rgb(231, 97, 108)}body{margin:0;text-align:center}#root{display:contents}.centered-page{min-height:100dvh;display:grid;place-items:center}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}button{border-radius:8px;border:1px solid #ccc;padding:.6em 1.2em;margin:0 .5em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}table{border-collapse:collapse}th,td{padding:12px}th{background-color:#b3c3e6}tr:nth-child(odd){background-color:#f5f7fa}tr:nth-child(2n){background-color:#e1e6ef}.back-button{position:fixed;top:20px;right:20px;padding:6px 12px;color:#000;background-color:#f0f0f088;border-radius:8px;font-size:12px;cursor:pointer;z-index:100}.back-button:hover{background-color:#d3d3d3}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}.quiz{box-sizing:border-box;max-width:560px;min-width:0;width:100%;padding:8px}.quiz-status{font-weight:700}.quiz-header{display:flex;align-items:center;justify-content:center;gap:1em;max-width:300px;margin:30px auto}.quiz-header .mark-checkbox{margin-right:auto}.quiz-header .mark-checkbox input{margin-right:8px;transform:scale(2);accent-color:gold;cursor:pointer}.quiz-header .quiz-word{margin:0 auto;cursor:pointer;-webkit-tap-highlight-color:transparent;transition:transform .15s ease}.quiz-header .quiz-word:active{transform:scale(.98)}.quiz-header .search-button{margin-left:auto;font-size:24px;border:none;background:none;cursor:pointer;padding:0}.answer-list{list-style:none;padding:0;margin-top:0}li button{display:flex;align-items:center;height:60px;width:100%;margin:8px 0;background-color:transparent;text-align:left;overflow:hidden;text-overflow:ellipsis;line-clamp:2}li button:hover{background-color:#f5f5f5;border-color:#999}li button:focus{outline:2px solid #0066cc;outline-offset:-2px}li button.correct{background-color:var(--color-success);color:#fff}li button.wrong{background-color:var(--color-error);color:#fff}.navi-button{padding:30px 40px}.quiz-result{-webkit-user-select:none;user-select:none}.quiz-result .navi-button{margin:10px auto}td.col-mark{color:#fff;font-weight:700}.correct-cell{background-color:var(--color-success)}.incorrect-cell{background-color:var(--color-error)}.col-word{text-align:left;font-weight:700}.col-word:is(td){-webkit-user-select:text;user-select:text}.col-meaning{text-align:left}.result-row{cursor:pointer;-webkit-tap-highlight-color:transparent}.result-row:hover{background-color:#ebd9a9}.level-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:15px;max-width:800px;width:100%;margin:0 auto;padding:20px;box-sizing:border-box}.level-card{margin:0;padding:.5em;aspect-ratio:1 / 1;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;text-decoration:none;border-radius:12px;font-size:1.1rem;font-weight:700;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 6px #0000001a}.level-card:hover{transform:translateY(-5px);box-shadow:0 8px 12px #0003;z-index:100}@media(max-width:600px){.level-grid{grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;padding:15px}.level-card{font-size:1rem}}.level-modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.level-modal{background:#fff;margin:auto .5em;padding:2rem;border-radius:16px;width:min(90vw,500px);max-height:90vh;overflow-y:auto;position:relative}.level-stats{display:grid;grid-template-columns:1fr 1fr 1fr;gap:1rem;margin-top:1.5rem}.stat-item{display:flex;flex-direction:column;align-items:center;gap:.5rem;padding:.75rem;background:#f5f5f5;border-radius:8px}.stat-label{font-size:.85rem;color:#666;font-weight:500}.stat-value{font-size:1.5rem;font-weight:700}.stat-value.correct{color:#38be5a}.stat-value.incorrect{color:#f06068}.stat-value.unanswered{color:#999}.level-chart-container{position:relative;display:flex;align-items:center;justify-content:center;width:100%;height:100%}.level-chart{width:100%;height:100%;filter:drop-shadow(0 4px 8px rgba(0,0,0,.4))}.level-text{font-size:13px;font-weight:700;fill:#fff;text-shadow:0 1px 2px rgba(0,0,0,.3)}.register-container{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:1rem;background:linear-gradient(135deg,#667eea,#764ba2)}.register-card{background:#fff;padding:2rem;border-radius:8px;box-shadow:0 10px 25px #0003;width:100%;max-width:400px}.register-card h1{text-align:center;margin-bottom:2rem;color:#333;font-size:1.8rem}.login-container{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:1rem;background:linear-gradient(135deg,#667eea,#764ba2)}.login-card{background:#fff;padding:2rem;border-radius:8px;box-shadow:0 10px 25px #0003;width:100%;max-width:400px}.login-card h1{text-align:center;margin-bottom:2rem;color:#333;font-size:1.8rem}.form-group{margin-bottom:1.5rem}.form-group label{display:block;margin-bottom:.5rem;color:#555;font-weight:500}.form-group input{width:100%;padding:.75rem;border:1px solid #ddd;border-radius:4px;font-size:1rem;transition:border-color .3s;box-sizing:border-box}.form-group input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.form-group input:disabled{background-color:#f5f5f5;cursor:not-allowed}.error-message{background-color:#fee;color:#c33;padding:.75rem;border-radius:4px;margin-bottom:1rem;border-left:4px solid #c33}.submit-button{width:100%;padding:.75rem;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:4px;font-size:1rem;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s}.submit-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 5px 15px #667eea66}.submit-button:disabled{opacity:.6;cursor:not-allowed}.login-link{text-align:center;margin-top:1.5rem;padding-top:1.5rem;border-top:1px solid #eee;color:#666}.login-link a{color:#667eea;text-decoration:none;font-weight:600}.login-link a:hover{text-decoration:underline}.hamburger-btn{position:fixed;top:1rem;right:1rem;z-index:1000;width:3rem;height:3rem;background:#1f2937;border:none;border-radius:.5rem;cursor:pointer;display:flex;align-items:center;justify-content:center;color:#fff;transition:background-color .2s ease}.hamburger-btn:hover{background-color:#111827}.hamburger-btn:focus{outline:2px solid #60a5fa;outline-offset:2px}.hamburger-icon{display:flex;flex-direction:column;gap:.4rem;width:1.5rem;height:1.25rem}.hamburger-icon>span{width:100%;height:2px;background:#fff;border-radius:1px;transition:all .3s ease}.sidebar-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;z-index:999;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.sidebar{position:fixed;top:0;right:0;width:280px;height:100dvh;background:#1f2937;color:#fff;z-index:1001;display:flex;flex-direction:column;box-shadow:-2px 0 8px #0003;transform:translate(100%);transition:transform .3s cubic-bezier(.4,0,.2,1)}.sidebar.open{transform:translate(0)}.sidebar-header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 1rem;border-bottom:1px solid #374151}.sidebar-title{font-size:1.1rem;font-weight:700;color:#fff;text-decoration:none;flex:1;text-align:left}.sidebar-title:hover{color:#d1d5db}.sidebar-close-btn{background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:.25rem;display:flex;align-items:center;justify-content:center;width:2rem;height:2rem;border-radius:.375rem;transition:background-color .2s ease}.sidebar-close-btn:hover{background-color:#ffffff1a}.sidebar-close-btn:focus{outline:2px solid #60a5fa;outline-offset:2px}.sidebar-content{flex:1;padding:1rem;display:flex;flex-direction:column;gap:1rem;overflow-y:auto}.sidebar-user-section{padding:1rem;background:#ffffff0d;border-radius:.5rem}.sidebar-user-text{font-size:.95rem;color:#d1d5db;display:block}.sidebar-logout-btn{width:100%;padding:.75rem 1rem;background:transparent;border:1px solid rgba(255,255,255,.5);border-radius:.5rem;color:#fff;font-size:1rem;cursor:pointer;transition:all .2s ease}.sidebar-logout-btn:hover{border-color:#9ca3af;background-color:#ffffff0d}.sidebar-logout-btn:focus{outline:2px solid #60a5fa;outline-offset:2px}.sidebar-auth-links{display:flex;flex-direction:column;gap:.75rem}.sidebar-link{padding:.75rem 1rem;background:transparent;border:1px solid rgba(255,255,255,.5);border-radius:.5rem;color:#fff;text-decoration:none;font-size:1rem;display:block;text-align:center;transition:all .2s ease}.sidebar-link:hover{border-color:#9ca3af;background-color:#ffffff0d}.sidebar-link:focus{outline:2px solid #60a5fa;outline-offset:2px}@media(max-width:480px){.sidebar{width:100%}}