: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}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;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}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}.gapfill-card{position:relative;padding:1.5rem;background:#1e293b;border-radius:.75rem;margin-bottom:1rem}.report-icon-btn{position:absolute;bottom:8px;right:8px;background:none;border:none;padding:4px;cursor:pointer;outline:none}.report-icon-btn .tooltip-text{visibility:hidden;opacity:0;transition:opacity .2s;position:absolute;bottom:120%;right:50%;transform:translate(50%);background:#000c;color:#fff;font-size:12px;padding:4px 6px;border-radius:3px;white-space:nowrap;pointer-events:none;z-index:10}.report-icon-btn:hover .tooltip-text{visibility:visible;opacity:1}.report-form-card{position:absolute;bottom:40px;right:8px;background:#fff;border:1px solid #ddd;border-radius:4px;padding:12px;width:220px;box-shadow:0 2px 6px #00000026;z-index:10}.report-form-card h3{margin-top:0;margin-bottom:8px;font-size:1em}.report-form-card select,.report-form-card textarea{width:100%;margin-bottom:8px;padding:6px;border:1px solid #ccc;border-radius:4px}.report-form-buttons{display:flex;gap:6px;justify-content:flex-end}.cefr-badge{position:absolute;top:.75rem;right:.75rem;display:inline-flex;align-items:center;gap:.4rem;padding:.28rem .62rem;border-radius:9999px;border:1px solid #2a3d6e;background:#0d1b388c;color:#e5efff;font-size:.78rem;font-weight:800;letter-spacing:.04em;box-shadow:0 6px 18px #00000040,inset 0 1px #ffffff1f;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.cefr-badge:before{content:"";width:.5rem;height:.5rem;border-radius:50%;background:var(--badge-color, #8aa0ff);box-shadow:0 0 0 2px #ffffff0f inset}@media (max-width: 480px){.cefr-badge{top:.5rem;right:.5rem;padding:.24rem .5rem;font-size:.72rem}}.sentence-text{padding-right:3rem;font-size:1rem}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.5rem}.fav-btn{background:none;border:none;padding:0;cursor:pointer}.fav-btn:hover{opacity:.8}.levels-fieldset{border:none;margin-bottom:16px;padding:0}.level-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}.level-chip{position:relative;display:inline-flex;align-items:center;gap:.4rem;padding:6px 10px;border-radius:9999px;border:1px solid #2a3d6e;background:#0d1b388c;color:#e5efff;font-weight:800;cursor:pointer;-webkit-user-select:none;-moz-user-select:none;user-select:none;transition:border-color .15s,background .15s,transform .05s}.level-chip input{position:absolute;inset:0;opacity:0;cursor:pointer}.level-chip .dot{width:8px;height:8px;border-radius:50%;background:var(--badge-color, #8aa0ff);box-shadow:0 0 0 2px #ffffff0f inset}.level-chip .txt{letter-spacing:.02em}.level-chip:hover{background:#0d1b38bf}.level-chip:active{transform:translateY(1px)}.level-chip:focus-within{outline:2px solid #3b82f6;outline-offset:2px}.level-chip.selected{border-color:var(--badge-color, #8aa0ff);background:#0d1b38bf}.cefr-A1{--badge-color: #8ec7ff}.cefr-A2{--badge-color: #6ef4cf}.cefr-B1{--badge-color: #7fb4ff}.cefr-B2{--badge-color: #f0c35b}.cefr-C1{--badge-color: #e69aa0}.level-chip{border:1px solid #2a3d6e}.level-chip .dot{width:14px;height:14px;border-radius:4px;border:2px solid var(--badge-color, #8aa0ff);background:transparent;position:relative;transition:background .15s ease,border-color .15s ease,transform .05s ease}.level-chip.selected{border-color:var(--badge-color, #8aa0ff);background:#ffd36a14;color:#fff;box-shadow:0 0 0 2px #ffd36a26}.level-chip.selected .dot:after{position:absolute;inset:0;display:grid;place-items:center;font-size:12px;font-weight:900;color:#0a1f44}.level-row{gap:8px}.level-chip{padding:4px 8px;font-size:.74rem}.level-chip .dot{width:10px;height:10px;border-width:2px}.level-chip.selected .dot:after{font-size:10px}@media (max-width: 520px){.level-row{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;gap:6px}.level-chip{padding:3px 7px;font-size:.68rem}.level-chip .dot{width:9px;height:9px;border-width:1.5px}.level-chip.selected .dot:after{font-size:9px}}.level-chip .dot{width:10px;height:10px;border-radius:50%;border:2px solid var(--badge-color, #8aa0ff);background:transparent;transition:background .15s ease,border-color .15s ease,transform .05s ease}.level-chip.selected{border-color:var(--badge-color, #8aa0ff);background:#0d1b38bf;color:#fff}.level-chip.selected .dot{background:var(--badge-color, #8aa0ff)}.level-chip.selected:after{content:"";position:absolute;inset:-3px;border-radius:9999px;border:2px solid var(--badge-color, #8aa0ff);opacity:.35;pointer-events:none}.level-chip:hover{border-color:var(--badge-color, #8aa0ff)}.count-row{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:8px 0 6px}.count-label{opacity:.8;font-size:.85rem}.count-chip{background:#0f2246;border:1px solid #2a3d6e;color:#cfe2ff;border-radius:9999px;padding:6px 10px;font-weight:800;cursor:pointer;transition:filter .15s,transform .05s,border-color .15s}.count-chip:hover{filter:brightness(1.05)}.count-chip:active{transform:translateY(1px)}.count-chip.selected{background:linear-gradient(180deg,#ffd36a,#ffb200);color:#0a1f44;border-color:#ffb200}@media (max-width: 520px){.count-row{gap:6px}.count-chip{padding:4px 8px;font-size:.78rem}}.report-bar{margin-top:12px;padding:12px;border:1px solid #2a3d6e;border-radius:12px;background:#0d1b388c}.report-fields{display:grid;gap:8px}.report-input{width:100%;border:1px solid #2a3d6e;border-radius:10px;padding:8px 10px;background:#0f2246;color:#e5efff;resize:vertical}.report-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:8px}.generate-btn{background:linear-gradient(180deg,#162a57,#0f2246);color:#e5efff;border:1px solid #2a3d6e;border-radius:14px;padding:10px 16px;font-weight:800;letter-spacing:.01em;box-shadow:0 6px 18px #00000040,inset 0 0 0 9999px #ffffff05;transition:transform .05s ease,filter .15s ease,border-color .15s ease,box-shadow .15s ease}.generate-btn:hover{filter:brightness(1.05);border-color:#3b82f6;box-shadow:0 8px 22px #00000047,0 0 0 3px #3b82f633}.generate-btn:active{transform:translateY(1px)}.generate-btn:focus-visible{outline:none;box-shadow:0 0 0 3px #3b82f659}.generate-btn:disabled{opacity:.6;cursor:not-allowed;filter:none;box-shadow:none}.options-row{gap:10px;flex-wrap:wrap}.option-btn{background:#0d1b388c;color:#e5efff;border:1px solid #2a3d6e;border-radius:12px;padding:8px 12px;font-weight:700;transition:transform .05s ease,filter .15s ease,border-color .15s ease,background .15s ease}.option-btn:hover{filter:brightness(1.06);border-color:#3b82f6}.option-btn:active{transform:translateY(1px)}.option-btn:focus-visible{outline:2px solid #3b82f6;outline-offset:2px}.option-btn:disabled{opacity:.9;cursor:default}.option-btn.correct{border-color:#22c55e;background:#22c55e1f;color:#d7ffe7;box-shadow:0 0 0 2px #22c55e2e}.option-btn.incorrect{border-color:#ef4444;background:#ef44441a;color:#ffe2e2;box-shadow:0 0 0 2px #ef444424}@media (max-width: 520px){.generate-btn{padding:9px 14px;border-radius:12px}.option-btn{padding:7px 10px;border-radius:10px;font-weight:800}}.exercise-footer{display:flex;justify-content:flex-end;gap:10px;margin-top:10px;flex-wrap:wrap}.ghost-btn{background:transparent;color:#9ec3ff;border:1px dashed #2a3d6e;border-radius:12px;padding:8px 12px;font-weight:800;transition:border-color .15s,filter .15s,transform .05s}.ghost-btn:hover{border-color:#3b82f6;filter:brightness(1.05)}.ghost-btn:active{transform:translateY(1px)}@media (max-width: 520px){.exercise-footer{justify-content:center}}.App .btn-row .generate-btn{background:linear-gradient(180deg,#162a57,#0f2246)!important;color:#e5efff!important;border:1px solid #2a3d6e!important;border-radius:14px;box-shadow:0 6px 18px #00000040,inset 0 0 0 9999px #ffffff05}.App .btn-row .generate-btn:hover{filter:brightness(1.05);border-color:#3b82f6;box-shadow:0 8px 22px #00000047,0 0 0 3px #3b82f633}.App .gapfill-card .options-row .option-btn{background:#0d1b388c!important;color:#e5efff!important;border:1px solid #2a3d6e!important;border-radius:12px;box-shadow:none}.App .gapfill-card .options-row .option-btn.correct{border-color:#22c55e;background:#22c55e1f!important;color:#d7ffe7!important}.App .gapfill-card .options-row .option-btn.incorrect{border-color:#ef4444;background:#bd22221a!important;color:#ffe2e2!important}.App .gapfill-card .options-row .option-btn.incorrect{background:linear-gradient(180deg,#ef444438,#ef44441f)!important;border-color:#f43f5e!important;color:#fff!important;box-shadow:0 0 0 2px #f43f5e73,0 8px 22px #00000047}@media (prefers-reduced-motion: no-preference){.App .gapfill-card .options-row .option-btn.incorrect{animation:option-shake .28s ease}@keyframes option-shake{0%{transform:translate(0)}25%{transform:translate(-2px)}50%{transform:translate(2px)}75%{transform:translate(-1px)}to{transform:translate(0)}}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;background-color:#0a1f44;color:#fff;font-family:Arial,sans-serif}body{display:flex;justify-content:center;min-height:100vh}.App{display:flex;flex-direction:column;width:100%;max-width:800px;margin:50px 0;padding:20px;background:transparent}.content-container{background:#12254b;padding:30px;border-radius:12px;box-shadow:0 4px 20px #0000004d;width:100%}h1,h2{color:#fdbf2d;text-align:center}.card{background:#1b305e;border-radius:8px;padding:20px;margin-bottom:24px;box-shadow:0 4px 10px #00000040}.card p{font-size:1.1rem;margin:0 0 12px}.filter-panel{margin-bottom:24px}.filter-panel fieldset{border:none;margin-bottom:16px}.filter-panel legend{color:#fdbf2d}.filter-panel label{margin-right:12px;cursor:pointer}.filter-panel select{padding:6px 10px;border-radius:4px;border:none;font-size:1rem}button{font-size:1rem;border:none;border-radius:6px;padding:10px 16px;cursor:pointer;transition:background .2s}.generate-btn{background:#fdbf2d;color:#12254b;margin:16px 0}.generate-btn:hover:not(:disabled){background:#f7c849}.generate-btn:disabled{opacity:.6;cursor:default}.option-btn{background:#fdbf2d;color:#12254b;margin:6px}.option-btn.correct{background:#4caf50;color:#fff}.option-btn.incorrect{background:#d32f2f;color:#fff}.explanation{margin-top:20px;background:#263e6a;color:#f1f1f1;padding:15px;border-left:4px solid #fdbf2d;border-radius:6px}.explanation-card{background:#1b305e;border-left:4px solid #fdbf2d;border-radius:6px;padding:20px;margin:20px auto;max-width:700px}.progress-tracker{margin-top:24px;font-size:1.1rem;color:#ccc}.explanation{margin-top:24px;padding:16px;background:#1b305e;border-radius:6px}.explanation-title{margin-bottom:12px;color:#fdbf2d;font-weight:700}.explanation-list{list-style:none;padding:0;margin:0}.explanation-item{display:flex;flex-direction:column;margin-bottom:12px;padding:12px;border-radius:4px;transition:background .2s,color .2s}.explanation-item.correct{background:#4caf5026;color:#a5d6a7}.explanation-item.incorrect{background:#f4433626;color:#ef9a9a}.explanation-flag{font-size:1.2rem;margin-bottom:4px;font-weight:700}.explanation-option{font-weight:700;margin-bottom:4px}.explanation-text{margin:0;font-size:.95rem;line-height:1.4;color:#e0e0e0}.auth-page{min-height:100vh;display:grid;place-items:center;padding:24px}.auth-card{width:100%;max-width:480px;background:#12254b;border-radius:16px;padding:28px;box-shadow:0 16px 40px #00000059}.auth-title{text-align:center;font-size:1.75rem;font-weight:800;color:#ffc23d;margin-bottom:12px}.auth-form{margin-top:8px}.form-row{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.form-row label{font-size:.95rem;color:#cfe2ff}.input{width:100%;padding:12px 14px;border-radius:12px;border:1px solid #223869;background:#0f2246;color:#fff;outline:none}.input:focus{border-color:#3b82f6;box-shadow:0 0 0 3px #3b82f640}.actions{display:flex;justify-content:center;margin-top:6px}.primary-btn{background:linear-gradient(180deg,#ffd36a,#ffb200);color:#0a1f44;border:none;border-radius:12px;padding:10px 18px;font-weight:800;cursor:pointer}.primary-btn:hover{filter:brightness(1.05)}.primary-btn:active{transform:translateY(1px)}.link-btn{background:none;border:none;color:#9ec3ff;cursor:pointer;text-decoration:underline;padding:0}.error-text{color:#ff6b6b;font-size:.95rem;margin:8px 0 4px;text-align:center}.auth-switch{text-align:center;margin-top:14px;color:#d8e2f8}.btn-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:16px 0 12px}.review-btn{background:#0f2246;border:1px solid #2a3d6e;color:#cfe2ff;border-radius:12px;padding:10px 14px;font-weight:800;cursor:pointer}.review-btn:hover{filter:brightness(1.05)}.review-btn:active{transform:translateY(1px)}.review-btn.mistakes{border-color:#ff6b6b;color:#ff9c9c}.review-btn.favourites{border-color:#66d9e8;color:#66d9e8}.topbar-btn{background:transparent;border:1px solid #2a3d6e;color:#cfe2ff;border-radius:10px;padding:8px 12px;font-weight:800;cursor:pointer}.topbar-btn:hover{background:#0f2246}.topbar-btn:active{transform:translateY(1px)}.fav-btn svg{transition:transform .1s ease,filter .15s ease}.fav-btn:hover svg{transform:scale(1.05);filter:brightness(1.1)}.toast-container{position:fixed;top:16px;right:16px;z-index:1000;display:flex;flex-direction:column;gap:10px;pointer-events:none}.toast{pointer-events:auto;background:#12254b;border:1px solid #2a3d6e;color:#cfe2ff;padding:10px 12px;border-radius:10px;box-shadow:0 8px 24px #00000059;font-weight:700;max-width:320px}.select-wrap{position:relative;display:inline-block;vertical-align:middle}.select{appearance:none;-webkit-appearance:none;-moz-appearance:none;background:#0f2246;color:#e5efff;border:1px solid #2a3d6e;border-radius:12px;padding:8px 36px 8px 12px;font-weight:800;line-height:1.2;min-width:220px;box-shadow:0 6px 18px #00000026 inset}.select:focus{outline:none;border-color:#3b82f6;box-shadow:0 0 0 3px #3b82f640}.select:hover{border-color:#3b82f6}.select-wrap:after{content:"";position:absolute;right:12px;top:50%;width:10px;height:10px;border-right:2px solid #9ec3ff;border-bottom:2px solid #9ec3ff;transform:translateY(-50%) rotate(45deg);pointer-events:none;opacity:.9}@media (max-width: 520px){.select{min-width:0;width:100%}}.topbar-btn.profile-badge{display:inline-flex;align-items:center;gap:.5rem;padding:.35rem .6rem .35rem .4rem}.topbar-btn.profile-badge .avatar{width:1.45rem;height:1.45rem;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;background:#294b84;border:1px solid #3a6ebd;font-weight:700;line-height:1;font-size:.9rem}@media (max-width: 420px){.topbar-btn.profile-badge .label{display:none}}.profile-badge-btn{background:none;border:none;cursor:pointer;padding:0;display:inline-flex;align-items:center;justify-content:center}.profile-badge-btn .avatar{width:1.8rem;height:1.8rem;border-radius:50%;background:#294b84;border:1px solid #3a6ebd;color:#e6f0ff;font-weight:700;font-size:.9rem;display:inline-flex;align-items:center;justify-content:center;transition:transform .15s ease,filter .15s ease}.profile-badge-btn:hover .avatar{filter:brightness(1.1);transform:scale(1.05)}