*{box-sizing:border-box}body{color:#e0e0e0;background:#121212;font-family:-apple-system,BlinkMacSystemFont,segoe ui,sans-serif;line-height:1.5;margin:0;padding:0}header{background:#1a1a2e;padding:1rem 1.5rem;border-bottom:2px solid #e94560}header h1{margin:0;font-size:1.25rem;color:#fff}footer{text-align:center;padding:1rem;color:#666;font-size:.8rem}a{color:#64b5f6;text-decoration:none}main{max-width:900px;margin:0 auto;padding:0 1rem}.controls{position:sticky;top:0;background:#121212;padding:1rem 0;z-index:10;border-bottom:1px solid #2a2a2a}#search{width:100%;padding:.75rem 1rem;background:#1e1e1e;border:1px solid #333;border-radius:8px;color:#e0e0e0;font-size:1rem;outline:none;transition:border-color .2s}#search:focus{border-color:#e94560}#search::placeholder{color:#666}.filters{display:flex;gap:.5rem;margin-top:.75rem;flex-wrap:wrap}.filter-btn{padding:.4rem .85rem;background:#1e1e1e;border:1px solid #333;border-radius:20px;color:#aaa;font-size:.85rem;cursor:pointer;transition:all .2s}.filter-btn:hover{border-color:#e94560;color:#e0e0e0}.filter-btn.active{background:#e94560;border-color:#e94560;color:#fff}#card-list{padding-top:.5rem}.card-item{background:#1e1e1e;border:1px solid #2a2a2a;border-radius:8px;margin-bottom:.5rem;overflow:hidden;transition:border-color .2s}.card-item:hover{border-color:#444}.card-item.struggling{border-left:3px solid #e94560}.card-item.hidden{display:none}.card-header{padding:.75rem 1rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:1rem;user-select:none}.card-title-row{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;min-width:0}.card-title{font-size:1.1rem;font-weight:600;color:#fff}.card-meta{color:#888;font-size:.85rem;background:#888;border-radius:3px;cursor:pointer;transition:background .2s}.card-meta.revealed,.card-header:hover .card-meta{background:0 0}.card-stats{display:flex;gap:.5rem;flex-shrink:0}.stat{font-size:.75rem;padding:.2rem .5rem;background:#2a2a2a;border-radius:4px;color:#aaa;white-space:nowrap}.stat-bad{background:rgba(233,69,96,.2);color:#e94560}.difficult-badge{background:#e94560;color:#fff;font-size:.7rem;font-weight:600;padding:.15em .5em;border-radius:4px;white-space:nowrap}.card-body{display:none;padding:0 1rem 1rem;border-top:1px solid #2a2a2a;color:#ccc}.card-item.open .card-body{display:block}.card-body h3{color:#e94560;font-size:.9rem;text-transform:uppercase;letter-spacing:.05em;margin-top:1rem;margin-bottom:.5rem}.card-body p{margin:.5rem 0}.card-body b{color:#fff}.card-body table{width:100%;border-collapse:collapse;font-size:.85rem;margin-top:.5rem}.card-body th,.card-body td{padding:.4rem .75rem;text-align:left;border-bottom:1px solid #2a2a2a}.card-body th{color:#888;font-weight:600}.card-body hr{border:none;border-top:1px solid #2a2a2a;margin:1rem 0}.card-body ul,.card-body ol{padding-left:1.25rem}.random-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 0}.random-header h2{margin:0;color:#fff}.card-count{text-align:center;color:#666;font-size:.85rem;padding:1rem 0}article.card{background:#1e1e1e;border-radius:8px;padding:1.5rem;margin:1rem 0}article.card h1{color:#fff;margin-top:0}article.card.difficult{border-left:3px solid #e94560}article.card h3{color:#e94560;font-size:.9rem;text-transform:uppercase;letter-spacing:.05em}article.card table{width:100%;border-collapse:collapse;font-size:.85rem}article.card th,article.card td{padding:.4rem .75rem;text-align:left;border-bottom:1px solid #2a2a2a}article.card th{color:#888}article.card hr{border:none;border-top:1px solid #2a2a2a}.card-preview{background:#1e1e1e;border:1px solid #2a2a2a;border-radius:8px;padding:1rem;margin-bottom:.5rem}.card-preview.difficult{border-left:3px solid #e94560}.card-preview h2{margin:0 0 .25rem;font-size:1rem}.practice-wrap{padding:1rem 0}.practice-top{display:flex;justify-content:space-between;align-items:flex-start;padding:.75rem 0 1.25rem}.flashcard{background:#1e1e1e;border:1px solid #333;border-left:4px solid #e94560;border-radius:10px;min-height:260px;cursor:pointer;user-select:none;display:flex;flex-direction:column;transition:border-color .2s;overflow:hidden}.flashcard:focus{outline:none;border-color:#e94560}.flashcard-front{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2.5rem 2rem 1.5rem;text-align:center}.flashcard-title{font-size:2.75rem;font-weight:700;color:#fff;line-height:1.1;letter-spacing:.02em}.flashcard-deck{color:#555;font-size:.8rem;margin-top:.5rem;text-transform:uppercase;letter-spacing:.08em}.flashcard-hint{color:#444;font-size:.8rem;margin-top:1.5rem;transition:opacity .2s}.flashcard.revealed .flashcard-hint{opacity:0}.flashcard-back{display:none;padding:0 1.5rem 1.25rem;border-top:1px solid #2a2a2a;color:#ccc;animation:fade-in .2s ease}.flashcard.revealed .flashcard-back{display:block}@keyframes fade-in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.fc-reading{font-size:1.1rem;color:#aaa;margin:1rem 0 .5rem}.fc-content h3{color:#e94560;font-size:.85rem;text-transform:uppercase;letter-spacing:.05em;margin:1rem 0 .4rem}.fc-content p{margin:.4rem 0}.fc-content b{color:#fff}.fc-content table{width:100%;border-collapse:collapse;font-size:.85rem;margin-top:.5rem}.fc-content th,.fc-content td{padding:.35rem .6rem;text-align:left;border-bottom:1px solid #2a2a2a}.fc-content th{color:#666;font-weight:600}.fc-content hr{border:none;border-top:1px solid #2a2a2a;margin:.75rem 0}.flashcard-stats{display:flex;gap:.4rem;padding:.6rem 1.5rem;border-top:1px solid #1a1a1a;background:#191919}.practice-nav{display:flex;justify-content:space-between;padding:1rem 0;gap:.5rem}.practice-nav .filter-btn{flex:1;text-align:center}.sp-panel{background:#1a1a2e;border:1px solid #333;border-radius:8px;padding:1rem;margin-bottom:1rem}.sp-label{color:#aaa;font-size:.85rem;display:block;margin-bottom:.4rem}.sp-row{display:flex;gap:.5rem}.sp-input{flex:1;padding:.5rem .75rem;background:#1e1e1e;border:1px solid #333;border-radius:6px;color:#e0e0e0;font-size:.9rem;outline:none}.sp-input:focus{border-color:#e94560}.sp-note{margin:.5rem 0 0;color:#555;font-size:.75rem}#practice-card{background:#1e1e1e;border:1px solid #333;border-left:4px solid #e94560;border-radius:10px;padding:1.5rem}.pc-sentence-box{min-height:4rem;margin-bottom:1.25rem}.pc-loading{color:#555;font-style:italic;font-size:.95rem}.pc-english{font-size:1.35rem;color:#fff;line-height:1.4;font-weight:500}.pc-target-row{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;margin-bottom:1rem;padding:.6rem .75rem;background:#181818;border-radius:6px;font-size:.85rem}.pc-hint{color:#aaa}.practice-input{width:100%;padding:.75rem 1rem;background:#181818;border:1px solid #333;border-radius:8px;color:#e0e0e0;font-size:1.1rem;font-family:inherit;resize:vertical;outline:none;transition:border-color .2s}.practice-input:focus{border-color:#e94560}.pc-actions{display:flex;gap:.5rem;margin-top:.75rem}.feedback-panel{background:#1e1e1e;border:1px solid #333;border-radius:10px;padding:1.5rem}.fb-score{font-size:1.2rem;font-weight:700;margin-bottom:1rem}.fb-row{margin-bottom:.6rem;font-size:.95rem}.fb-label{color:#555;font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;margin-right:.5rem}.fb-val{color:#fff}.fb-feedback{color:#ccc;line-height:1.5;margin:.75rem 0}.fb-notes{margin:.5rem 0 0;padding-left:1.25rem;color:#aaa;font-size:.9rem;line-height:1.6}.bd-wrap{margin-top:1rem;padding-top:1rem;border-top:1px solid #2a2a2a}.bd-overview{color:#ccc;font-size:.95rem;line-height:1.5;margin-bottom:1rem;font-style:italic}.bd-section-title{font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:#555;margin:1.25rem 0 .6rem}.bd-steps{padding-left:1.5rem;margin:0}.bd-step{margin-bottom:1.1rem;line-height:1.5}.bd-step-title{font-weight:600;color:#e94560;font-size:.9rem;margin-bottom:.3rem}.bd-mapping{display:flex;align-items:center;gap:.5rem;margin-bottom:.35rem;flex-wrap:wrap}.bd-en{background:#1a1a2e;color:#a0c4ff;padding:.1rem .45rem;border-radius:4px;font-size:.9rem}.bd-arrow{color:#444;font-size:.85rem}.bd-jp{background:#1a2a1e;color:#80e8a0;padding:.1rem .45rem;border-radius:4px;font-size:.95rem}.bd-step-exp{color:#bbb;font-size:.88rem;line-height:1.55}.bd-word-order{color:#bbb;font-size:.9rem;line-height:1.55}.bd-grammar{padding-left:1.25rem;margin:0;color:#aaa;font-size:.88rem;line-height:1.7}.bd-rule{color:#ffd080;font-weight:600}.bd-error{color:#e94560;font-size:.9rem;margin-top:.75rem}@media(max-width:600px){.card-header{flex-direction:column;align-items:flex-start;gap:.5rem}.card-stats{width:100%}.filters{gap:.35rem}.filter-btn{font-size:.8rem;padding:.35rem .7rem}}