:root{--radius: 14px;--transition: all .25s ease}[data-theme=dark]{--bg: #0b0f1a;--bg-gradient: radial-gradient(circle at top, #111827, #020617);--card: rgba(255, 255, 255, .06);--text: #e5e7eb;--muted: #9ca3af;--primary: #38bdf8;--danger: #ef4444;--border: rgba(255, 255, 255, .12)}[data-theme=light]{--bg: #f8fafc;--bg-gradient: radial-gradient(circle at top, #ffffff, #e5e7eb);--card: rgba(255, 255, 255, .85);--text: #020617;--muted: #475569;--primary: #0284c7;--danger: #dc2626;--border: rgba(0, 0, 0, .08)}*{box-sizing:border-box;font-family:Inter,system-ui,sans-serif}body{margin:0;background:var(--bg-gradient);color:var(--text);transition:var(--transition)}.header{max-width:900px;margin:auto;padding:2rem 1rem;display:flex;justify-content:space-between;align-items:center}.header h1{margin:0;font-size:2rem}.header p{margin:0;color:var(--muted)}.theme-btn{background:var(--card);border:1px solid var(--border);padding:.5rem .9rem;border-radius:999px;cursor:pointer;transition:var(--transition)}.theme-btn:hover{transform:scale(1.05)}.container{max-width:900px;margin:auto;padding:1rem}.card{background:var(--card);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-radius:var(--radius);padding:1rem;border:1px solid var(--border);transition:var(--transition)}.card:hover{transform:translateY(-4px)}.form input,.form select{width:100%;padding:.7rem;margin-bottom:.7rem;border-radius:10px;border:1px solid var(--border);background:transparent;color:var(--text)}.form input:focus,.form select:focus{outline:none;border-color:var(--primary)}.btn{padding:.5rem .9rem;border-radius:10px;border:none;cursor:pointer;transition:var(--transition)}.primary{background:var(--primary);color:#fff}.primary:hover{filter:brightness(1.1)}.danger{background:var(--danger);color:#fff}.filter-bar{display:grid;grid-template-columns:1fr auto auto;gap:.5rem;margin:1rem 0}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem}.task h4{margin:0 0 .5rem}.actions{display:flex;justify-content:space-between;margin-top:.8rem}.badge{display:inline-block;font-size:.75rem;padding:.25rem .6rem;border-radius:999px;margin-bottom:.5rem}.completed{background:#22c55e;color:#000}.pending{background:#facc15;color:#000}.error{color:var(--danger)}.empty{text-align:center;color:var(--muted);margin-top:2rem}.modal-backdrop{position:fixed;inset:0;background:#00000080;display:grid;place-items:center}.modal{width:90%;max-width:400px}.toast{position:fixed;bottom:1rem;right:1rem;background:var(--primary);color:#fff;padding:.6rem 1rem;border-radius:999px;animation:slideUp .4s ease}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}