*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#0D1117;--card:rgba(13,17,23,0.9);--border:rgba(0,206,201,0.1);--primary:#636E72;--accent:#00CEC9;--text:#E2E8F0;--muted:#94A3B8;--dim:#475569;--r:10px;--rs:6px;--font:'Inter',system-ui,sans-serif}
body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased}
.app{height:100vh;display:flex;flex-direction:column}
.header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid var(--border);flex-shrink:0}
.header h1{font-size:1.1rem;font-weight:700;background:linear-gradient(135deg,var(--accent),#00B894);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.actions{display:flex;gap:6px}
.board{display:flex;gap:12px;padding:16px;overflow-x:auto;flex:1;align-items:flex-start}
.column{min-width:260px;max-width:300px;background:rgba(30,35,42,0.8);border:1px solid var(--border);border-radius:var(--r);display:flex;flex-direction:column;max-height:calc(100vh - 80px)}
.col-header{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-bottom:1px solid var(--border)}
.col-title{font-size:0.85rem;font-weight:600;cursor:pointer;padding:2px 4px;border-radius:4px}
.col-title:hover{background:rgba(255,255,255,0.05)}
.col-count{font-size:0.7rem;color:var(--dim);margin-left:6px}
.col-actions{display:flex;gap:4px}
.col-actions button{background:none;border:none;color:var(--dim);cursor:pointer;font-size:0.8rem;padding:2px 4px}
.col-actions button:hover{color:var(--accent)}
.card-list{padding:8px;flex:1;overflow-y:auto;min-height:40px;display:flex;flex-direction:column;gap:6px}
.card{background:rgba(0,0,0,0.25);border:1px solid rgba(255,255,255,0.04);border-radius:var(--rs);padding:10px;cursor:grab;transition:opacity 200ms}
.card.dragging{opacity:0.4}
.card-title{font-size:0.82rem;margin-bottom:6px}
.card-meta{display:flex;gap:6px;flex-wrap:wrap}
.card-label{font-size:0.65rem;padding:2px 6px;border-radius:8px;font-weight:600}
.card-due{font-size:0.68rem;color:var(--muted)}
.card-due.overdue{color:#EF4444}
.add-card-btn{padding:8px;text-align:center;font-size:0.8rem;color:var(--dim);cursor:pointer;border-top:1px solid var(--border)}
.add-card-btn:hover{color:var(--accent);background:rgba(0,206,201,0.05)}
.btn{font-family:var(--font);font-size:0.78rem;font-weight:500;padding:6px 12px;border-radius:var(--rs);border:none;cursor:pointer;transition:all 200ms}
.btn-ghost{background:rgba(0,206,201,0.06);color:var(--accent);border:1px solid var(--border)}
.btn-ghost:hover{background:rgba(0,206,201,0.12)}
@media(max-width:600px){.board{padding:10px;gap:8px}.column{min-width:220px}}