:root{--primary: #ef4444;--primary-dark: #dc2626;--bg-color: #fefce8;--surface-color: #fffbeb;--text-main: #1e3a8a;--text-muted: #64748b;--border-color: #bfdbfe;--error: #ef4444;--success: #16a34a;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .05);--radius: .2rem;--header-height: 60px;--bottom-nav-height: 60px}@media(prefers-color-scheme:dark){:root{--bg-color: #1c1917;--surface-color: #292524;--text-main: #efebe9;--text-muted: #a8a29e;--border-color: #44403c;--primary: #ef4444}}*,*:before,*:after{box-sizing:border-box}body{margin:0;padding:0;font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-color);color:var(--text-main);transition:background-color .3s,color .3s;-webkit-tap-highlight-color:transparent}a{text-decoration:none;color:inherit}ul{list-style:none;padding:0}#root{max-width:600px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;position:relative;background-color:var(--bg-color);overflow-x:hidden}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:3px;opacity:.5}.app-header{height:var(--header-height);background-color:var(--surface-color);border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:100;display:flex;align-items:center;padding:0 1rem;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background-color:#fffc}.header-content{width:100%;max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.app-title{font-size:1.25rem;font-weight:700;color:var(--primary);margin:0;letter-spacing:-.025em}.header-day-select{padding:.4rem .8rem;font-size:.9rem;border-radius:20px;border:1px solid var(--primary);background-color:transparent;color:var(--primary);font-weight:600;outline:none;cursor:pointer}.header-day-select:focus{background-color:var(--surface-color)}.word-list-container{width:100%;margin:0 auto}.word-columns-wrapper{display:flex;flex-wrap:wrap;justify-content:center;gap:2rem;align-items:flex-start}.list-controls{display:flex;justify-content:center;gap:1rem;margin-bottom:1.5rem;position:sticky;top:60px;background:var(--bg-color);padding:.5rem;z-index:10}.btn-toggle{padding:.5rem 1rem;border-radius:20px;border:1px solid var(--primary);background:transparent;color:var(--primary);font-weight:600;cursor:pointer;transition:all .2s}.btn-toggle.active{background:var(--primary);color:#fff}.word-table{display:flex;flex-direction:column;border:none;border-radius:2px;overflow:hidden;background:var(--surface-color);flex:1 1 350px;max-width:600px;box-shadow:var(--shadow-md);position:relative}.word-table:before{content:"";position:absolute;left:40px;top:0;bottom:0;width:2px;background-color:var(--primary);z-index:5;opacity:.5}.word-table:after{content:"";position:absolute;left:44px;top:0;bottom:0;width:1px;background-color:var(--primary);z-index:5;opacity:.3}.table-header{display:flex;background:transparent;border-bottom:2px solid var(--border-color);font-weight:800;color:var(--text-main);font-size:1rem;padding:0;text-transform:uppercase;letter-spacing:.05em}.table-row{display:flex;border-bottom:1px solid var(--border-color);min-height:50px}.table-row:last-child{border-bottom:1px solid var(--border-color)}.col-word,.col-meaning{flex:1;padding:.8rem 1rem;display:flex;align-items:center;position:relative;min-width:0;line-height:1.5}.col-word{border-right:1px dashed var(--border-color);font-weight:600;color:var(--text-main);padding-left:55px}.col-meaning{color:var(--text-main);font-weight:400}.content-cell{cursor:default}.content-cell.hidden{cursor:pointer;background-color:#e2e8f0;color:transparent;-webkit-user-select:none;user-select:none}.content-cell.hidden .text{opacity:0}.mask-text{display:none;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:.8rem;color:#94a3b8;pointer-events:none}.content-cell.hidden .mask-text{display:block}.content-cell.hidden:hover{background-color:#cbd5e1}#root{max-width:1280px;margin:0 auto;text-align:center}.app-main{padding:1rem 2rem 2rem;display:flex;flex-direction:column;align-items:center;min-height:calc(100vh - var(--header-height))}.offline-banner{background-color:#fca5a5;color:#7f1d1d;padding:.5rem 1rem;border-radius:8px;margin-bottom:1rem;font-weight:700}.content-container{width:100%;max-width:1200px;padding:1rem}.filter-container{margin-bottom:1.5rem}.day-select{padding:.5rem 1rem;font-size:1rem;border-radius:8px;border:1px solid #cbd5e1;background-color:#fff}.study-container{display:flex;flex-direction:column;align-items:center;gap:1.5rem}.progress-indicator{font-size:.9rem;color:#64748b;font-weight:500}.navigation-controls{display:flex;justify-content:space-between;width:100%;max-width:320px;gap:1rem}.btn-nav{flex:1;padding:.8rem;border-radius:12px;border:none;background-color:#3b82f6;color:#fff;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease}.btn-nav:hover:not(:disabled){background-color:#2563eb;transform:translateY(-2px)}.btn-nav:disabled{background-color:#cbd5e1;cursor:not-allowed;transform:none}.loading-state,.empty-state{margin-top:2rem;color:#64748b;font-size:1.1rem}.empty-icon{font-size:3rem;margin-bottom:1rem}