:root{--bg-app:#f8f9fb;--bg-card:#fff;--bg-soft:#f1f3f5;--primary:#4c6ef5;--primary-hover:#3b5bdb;--success:#2f9e44;--danger:#e03131;--warning:#f08c00;--text-main:#212529;--text-muted:#6c757d;--radius-sm:6px;--radius-md:12px;--radius-lg:18px;--shadow-soft:0 6px 20px #0000000f;--shadow-hover:0 10px 30px #00000014;--ease:cubic-bezier(0.4,0,0.2,1)}*{box-sizing:border-box}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--bg-app);color:var(--text-main);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;margin:0}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}button{font-family:inherit;outline:none}html{scroll-behavior:smooth}.pi-container{animation:fadeIn .5s ease;background:#faf7ff;border-radius:16px;box-shadow:0 0 25px #8c4dff26;margin:40px auto;max-width:700px;padding:20px}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.pi-title{color:#6b2cff;font-size:32px;font-weight:900;margin-bottom:10px;text-align:center}.pi-desc{color:#5b4a8f;font-size:16px;margin-bottom:25px;text-align:center}.pi-box{background:#fff;border-radius:14px;box-shadow:0 4px 15px #693cdc1f;margin-bottom:20px;padding:20px;transition:.2s ease}.pi-box:hover{box-shadow:0 6px 22px #693cdc33;transform:translateY(-2px)}.pi-section-title{color:#6b2cff;font-size:20px;font-weight:700;margin-bottom:12px}.pi-button{align-items:center;background:linear-gradient(135deg,#7d42ff,#b08bff);border:none;border-radius:10px;color:#fff;cursor:pointer;display:flex;font-size:17px;font-weight:700;justify-content:center;padding:12px;transition:.25s;width:100%}.pi-button:hover{background:linear-gradient(135deg,#6a23ff,#a174ff);transform:translateY(-2px)}.pi-button:disabled{cursor:not-allowed;opacity:.6}.loader{animation:spin .8s linear infinite;border:3px solid 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var(--ease)}.vocab-btn.primary{background:var(--primary);color:#fff}.vocab-btn.primary:hover:not(:disabled){transform:translateY(-1px)}.vocab-btn.primary:disabled{cursor:not-allowed;opacity:.5}.vocab-btn.success{background:var(--success);color:#fff}.vocab-items-section{margin-bottom:40px}.vocab-items{grid-gap:16px;display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.vocab-item-card{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-soft);padding:16px;transition:transform .15s var(--ease),box-shadow .15s 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#00000040;border-radius:var(--radius-md);box-shadow:var(--shadow-soft);color:var(--text-main);cursor:pointer;font-size:.95rem;font-weight:600;margin:8px;min-width:140px;padding:14px 18px;transition:transform .15s var(--ease),box-shadow .15s var(--ease),background-color .15s var(--ease),border-color .15s var(--ease)}.answer-option:hover:not(.disabled){border-color:#00000073;box-shadow:var(--shadow-hover);transform:translateY(-2px)}.answer-option.selected{background:var(--primary);border-color:#00000073;color:#fff}.answer-option.correct{background:var(--success);border-color:#0000008c;color:#fff}.answer-option.wrong{background:var(--danger);border-color:#0000008c;color:#fff}.answer-option.disabled{cursor:not-allowed;opacity:.85}
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