: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}}:root{--bg-app: #f4f7f9;--bg-header: #ffffff;--bg-column: #ebecf0;--bg-card: #ffffff;--text-primary: #172b4d;--text-secondary: #5e6c84;--border: #dfe1e6;--shadow: 0 1px 3px rgba(0,0,0,.1);--todo: #ff9f1a;--progress: #0079bf;--done: #5aac44}.dark-mode{--bg-app: #121417;--bg-header: #1a1d23;--bg-column: #22272e;--bg-card: #2d333b;--text-primary: #adbac7;--text-secondary: #768390;--border: #444c56;--shadow: 0 4px 12px rgba(0,0,0,.3)}body{margin:0;padding:0;background-color:var(--bg-app);transition:background-color .3s ease;font-family:Inter,-apple-system,sans-serif;overflow-x:hidden}.app-container{width:100vw;min-height:100vh;display:flex;flex-direction:column}header{background:var(--bg-header);padding:1rem 2rem;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border);box-shadow:var(--shadow);width:100%;box-sizing:border-box}.header-left{display:flex;align-items:center;gap:20px}h1{font-size:1.1rem;margin:0;color:var(--text-primary)}.theme-toggle,.clear-btn{background:var(--bg-column);border:1px solid var(--border);color:var(--text-primary);padding:6px 12px;border-radius:6px;cursor:pointer;font-size:.8rem}.add-task-container{display:flex;gap:8px;align-items:center}.add-task-container input{padding:8px 12px;border-radius:6px;border:1px solid var(--border);background:var(--bg-card);color:var(--text-primary);width:200px;outline:none}.add-btn{background:#0079bf;color:#fff;border:none;padding:8px 16px;border-radius:6px;font-weight:600;cursor:pointer}.board{display:flex;gap:24px;padding:24px;justify-content:flex-start;overflow-x:auto;flex:1;width:100%;box-sizing:border-box}.column{width:350px;flex-shrink:0}.column-header{display:flex;justify-content:space-between;margin-bottom:12px}.column-title{font-size:.75rem;font-weight:700;text-transform:uppercase;color:var(--text-secondary)}.count-badge{background:var(--border);padding:2px 8px;border-radius:10px;font-size:.7rem;color:var(--text-primary)}.task-list{background:var(--bg-column);border-radius:10px;padding:10px;min-height:75vh}.column[data-status=todo] .task-list{border-top:4px solid var(--todo)}.column[data-status=in-progress] .task-list{border-top:4px solid var(--progress)}.column[data-status=done] .task-list{border-top:4px solid var(--done)}.task-card{background:var(--bg-card);border-radius:8px;padding:14px 16px;margin-bottom:10px;box-shadow:var(--shadow);display:flex;justify-content:space-between;align-items:center;cursor:grab;border:1px solid var(--border);transition:transform .1s}.task-card:hover{transform:translateY(-2px);border-color:#0079bf}.task-title{font-size:.95rem;color:var(--text-primary);flex:1;margin-right:12px}.delete-btn{background:none;border:none;color:var(--text-secondary);font-size:1.1rem;cursor:pointer;padding:4px;display:flex;align-items:center;transition:color .2s}.delete-btn:hover{color:#eb5a46}.empty-message{text-align:center;color:var(--text-secondary);font-size:.8rem;margin-top:30px;opacity:.6}