:root{--bg-color: #f1f5f9;--card-bg: #ffffff;--text-primary: #334155;--text-secondary: #64748b;--accent-color: #0f172a;--accent-hover: #1e293b;--border-color: #e2e8f0;--todo-color: #64748b;--in-progress-color: #3b82f6;--done-color: #10b981;--high-priority: #ef4444;--medium-priority: #f59e0b;--low-priority: #10b981;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1)}*{box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;margin:0;background-color:var(--bg-color);color:var(--text-primary);line-height:1.6}#app{min-height:100vh}.header{background:var(--card-bg);border-bottom:1px solid var(--border-color);padding:1.5rem 2rem;box-shadow:var(--shadow-sm);position:sticky;top:0;z-index:100}.header-content{max-width:1400px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.header-title{font-size:1.5rem;font-weight:800;margin:0;color:var(--accent-color);letter-spacing:-.025em}.container{max-width:1400px;margin:0 auto;padding:2rem}.filters{display:flex;gap:.75rem;margin-bottom:2rem;flex-wrap:wrap;background:var(--card-bg);padding:1rem;border-radius:12px;border:1px solid var(--border-color);box-shadow:var(--shadow-sm)}.filter-btn{padding:.5rem 1.25rem;border:1px solid transparent;background:transparent;border-radius:8px;cursor:pointer;font-weight:600;color:var(--text-secondary);transition:all .2s;font-size:.9rem}.filter-btn:hover{background:#f1f5f9;color:var(--text-primary)}.filter-btn.active{background:var(--accent-color);color:#fff;box-shadow:var(--shadow-sm)}.kanban-board{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;margin-bottom:2rem;align-items:start}.column{background:#f8fafc;border:1px solid var(--border-color);border-radius:16px;padding:1.5rem;min-height:500px;display:flex;flex-direction:column}.column-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:2px solid var(--border-color)}.column-title{font-size:1.1rem;font-weight:700;display:flex;align-items:center;gap:.75rem;text-transform:uppercase;letter-spacing:.05em}.column-title.todo{color:var(--todo-color);border-bottom-color:var(--todo-color)}.column-title.in-progress{color:var(--in-progress-color);border-bottom-color:var(--in-progress-color)}.column-title.done{color:var(--done-color);border-bottom-color:var(--done-color)}.task-count{background:#fff;padding:.25rem .75rem;border-radius:9999px;font-size:.8rem;font-weight:700;color:var(--text-secondary);box-shadow:var(--shadow-sm);border:1px solid var(--border-color)}.task-list{display:flex;flex-direction:column;gap:1rem;flex:1}.task-card{background:#fff;border:1px solid var(--border-color);border-radius:12px;padding:1.25rem;cursor:move;transition:all .2s cubic-bezier(.4,0,.2,1);box-shadow:var(--shadow-sm);position:relative}.task-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--accent-color)}.task-header{display:flex;justify-content:space-between;align-items:start;margin-bottom:.75rem}.task-title{font-weight:700;margin-bottom:.5rem;flex:1;color:var(--text-primary);font-size:1rem}.task-description{color:var(--text-secondary);font-size:.9rem;margin-bottom:1rem;line-height:1.5}.task-footer{display:flex;justify-content:space-between;align-items:center;margin-top:1rem;padding-top:1rem;border-top:1px solid #f1f5f9}.priority-badge{padding:.25rem .75rem;border-radius:6px;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em}.priority-badge.high{background:#ef44441a;color:var(--high-priority);border:1px solid rgba(239,68,68,.2)}.priority-badge.medium{background:#f59e0b1a;color:var(--medium-priority);border:1px solid rgba(245,158,11,.2)}.priority-badge.low{background:#10b9811a;color:var(--low-priority);border:1px solid rgba(16,185,129,.2)}.task-actions{display:flex;gap:.5rem}.task-btn{padding:.4rem;border:none;background:transparent;cursor:pointer;border-radius:6px;font-size:.9rem;transition:all .2s;color:var(--text-secondary)}.task-btn:hover{background:#f1f5f9;color:var(--text-primary)}.task-btn.delete:hover{background:#ef44441a;color:var(--high-priority)}.add-task-form{background:var(--card-bg);border:1px solid var(--border-color);border-radius:16px;padding:2rem;margin-bottom:2rem;box-shadow:var(--shadow-sm)}.form-title{font-size:1.25rem;font-weight:700;margin-bottom:1.5rem;color:var(--text-primary)}.form-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:1.5rem;margin-bottom:1.5rem}.form-input{padding:.75rem 1rem;border:1px solid var(--border-color);border-radius:8px;font-size:.95rem;transition:all .2s;background:#f8fafc}.form-input:focus{outline:none;background:#fff;border-color:var(--accent-color);box-shadow:0 0 0 3px #0f172a1a}.form-textarea{grid-column:1 / -1;padding:.75rem 1rem;border:1px solid var(--border-color);border-radius:8px;font-size:.95rem;font-family:inherit;resize:vertical;min-height:100px;background:#f8fafc;transition:all .2s}.form-textarea:focus{outline:none;background:#fff;border-color:var(--accent-color);box-shadow:0 0 0 3px #0f172a1a}.form-select{padding:.75rem 1rem;border:1px solid var(--border-color);border-radius:8px;background:#f8fafc;cursor:pointer;font-size:.95rem;transition:all .2s}.form-select:focus{outline:none;background:#fff;border-color:var(--accent-color);box-shadow:0 0 0 3px #0f172a1a}.submit-btn{padding:.75rem 2rem;background:var(--accent-color);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer;transition:all .2s;font-size:.95rem;box-shadow:var(--shadow-sm)}.submit-btn:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.empty-column{text-align:center;padding:4rem 1rem;color:var(--text-secondary);font-style:italic}