:root{--bg: #0f172a;--card: #1e293b;--border: #334155;--text: #e2e8f0;--muted: #94a3b8;--accent: #3b82f6;--danger: #ef4444}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}.center{display:grid;place-items:center;min-height:100vh}.muted{color:var(--muted);font-size:.9rem}.error{color:var(--danger);margin:.5rem 0}.auth-wrap{max-width:380px;margin:8vh auto;padding:0 1rem;text-align:center}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.25rem;text-align:left;display:flex;flex-direction:column;gap:.75rem}.card label{display:flex;flex-direction:column;gap:.3rem;font-size:.9rem}input{padding:.55rem .7rem;border-radius:8px;border:1px solid var(--border);background:#0b1220;color:var(--text);font-size:1rem}button{padding:.55rem .9rem;border-radius:8px;border:none;background:var(--accent);color:#fff;font-size:1rem;cursor:pointer}button:disabled{opacity:.6;cursor:default}button.link{background:none;color:var(--accent);padding:0;font-size:inherit;width:auto}button.link.danger{color:var(--danger)}.app{max-width:640px;margin:2rem auto;padding:0 1rem}.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.25rem}.profile{display:flex;align-items:center;gap:.75rem}.avatar{width:48px;height:48px;border-radius:50%;object-fit:cover;border:1px solid var(--border)}.avatar.placeholder{display:grid;place-items:center;background:var(--card);color:var(--muted)}.email{font-weight:600}.add{flex-direction:row;flex-wrap:wrap}.add input{flex:1 1 140px}.tasks{list-style:none;padding:0;margin:1.25rem 0 0;display:flex;flex-direction:column;gap:.5rem}.tasks li{display:flex;align-items:center;gap:.75rem;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:.7rem .9rem}.tasks li.done .task-title{text-decoration:line-through;color:var(--muted)}.task-body{flex:1}.task-title{font-weight:500}