body{margin:0;padding:0}:root{--primary-color: #6366f1;--bg-color: #f8fafc;--card-bg: #ffffff;--text-main: #1e293b;--text-muted: #64748b;--border-color: #e2e8f0;--shadow: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--border-radius: 12px;--transition: all .2s ease}body{margin:0;background-color:var(--bg-color);color:var(--text-main);font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.5}#root{max-width:1000px;margin:0 auto;padding:2rem}.container{display:flex;flex-direction:column;gap:2rem}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}h1{font-size:1.875rem;font-weight:700;margin:0;color:var(--text-main)}.nav-buttons{display:flex;gap:.75rem}button{display:inline-flex;align-items:center;gap:.5rem;padding:.625rem 1rem;font-size:.875rem;font-weight:500;border-radius:var(--border-radius);border:1px solid var(--border-color);background:var(--card-bg);cursor:pointer;transition:var(--transition);color:var(--text-main)}button:hover{border-color:var(--primary-color);color:var(--primary-color)}button.primary{background:var(--primary-color);border-color:var(--primary-color);color:#fff}button.primary:hover{background:#4f46e5;border-color:#4f46e5}.search-bar{display:flex;gap:1rem;background:var(--card-bg);padding:.75rem 1rem;border-radius:var(--border-radius);border:1px solid var(--border-color);box-shadow:var(--shadow)}.search-bar input{flex:1;border:none;outline:none;font-size:1rem;background:transparent}.category-bar{display:flex;gap:.5rem;overflow-x:auto;padding-bottom:.5rem}.category-tag{padding:.25rem .75rem;border-radius:9999px;font-size:.875rem;background:#f1f5f9;color:var(--text-muted);cursor:pointer;white-space:nowrap;transition:var(--transition)}.category-tag.active{background:var(--primary-color);color:#fff}.table-container{overflow-x:auto;background:var(--card-bg);border-radius:var(--border-radius);border:1px solid var(--border-color);box-shadow:var(--shadow)}.word-table{width:100%;border-collapse:collapse;text-align:left;font-size:.9375rem}.word-table thead th{background:#f8fafc;padding:1rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;font-size:.75rem;letter-spacing:.05em;border-bottom:2px solid var(--border-color);white-space:nowrap}.word-table tbody tr{border-bottom:1px solid var(--border-color);transition:background-color .2s ease}.word-table tbody tr:last-child{border-bottom:none}.word-table tbody tr:hover{background-color:#f1f5f9}.word-table tbody tr:nth-child(2n){background-color:#fbfcfe}.word-table td{padding:1rem;vertical-align:middle}.word-cell strong{color:var(--primary-color);font-size:1rem}.sentences-cell{color:var(--text-muted);max-width:300px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.word-actions{display:flex;gap:.5rem}.icon-button{padding:.375rem;border-radius:6px;background:transparent;border:1px solid transparent;color:var(--text-muted);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition)}.icon-button:hover{background:#e2e8f0;border-color:var(--border-color);color:var(--primary-color)}.icon-button.delete:hover{background:#fef2f2;border-color:#fee2e2;color:#ef4444}.word-category{font-size:.75rem;font-weight:600;text-transform:uppercase;color:var(--primary-color);background:#eef2ff;padding:.25rem .5rem;border-radius:4px}.modal-overlay{position:fixed;inset:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:1000}.modal-content{background:var(--card-bg);padding:2rem;border-radius:var(--border-radius);width:100%;max-width:500px;display:flex;flex-direction:column;gap:1.5rem}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-group label{font-size:.875rem;font-weight:600;color:var(--text-muted)}.form-group input,.form-group textarea{padding:.75rem;border-radius:8px;border:1px solid var(--border-color);font-size:1rem}.flashcard-container{display:flex;flex-direction:column;align-items:center;gap:2rem;padding:4rem 0}.flashcard{perspective:1000px;width:100%;max-width:400px;min-height:300px;cursor:pointer}.flashcard-inner{position:relative;width:100%;height:100%;min-height:300px;text-align:center;transition:transform .6s;transform-style:preserve-3d;box-shadow:var(--shadow);border-radius:var(--border-radius)}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--card-bg);border-radius:var(--border-radius);padding:1.5rem;box-sizing:border-box}.flashcard-back{transform:rotateY(180deg);overflow-y:auto;justify-content:flex-start;padding-top:2rem}.flashcard-front h2{font-size:2rem;margin:0}.flashcard-back h3{font-size:1.5rem;color:var(--primary-color);margin:0 0 1rem}