:root{--bg:#f4f6fb;--card:#fff;--accent:#4f6ef7;--done:#8a94a6;--danger:#e5484d}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);min-height:100vh;display:flex;align-items:flex-start;justify-content:center;padding:40px 16px}
.app{background:var(--card);width:100%;max-width:520px;border-radius:14px;box-shadow:0 8px 30px rgba(30,40,90,.12);padding:24px}
h1{font-size:1.25rem;margin-bottom:16px;color:#24304f}
#task-form{display:flex;gap:8px;margin-bottom:16px}
#task-input{flex:1;padding:10px 12px;border:1px solid #d6dbe6;border-radius:8px;font-size:1rem}
#task-input:focus{outline:2px solid var(--accent);border-color:transparent}
.btn{padding:10px 14px;border:none;border-radius:8px;font-size:.95rem;cursor:pointer}
.btn.add{background:var(--accent);color:#fff}
.btn.add:hover{filter:brightness(.92)}
ul{list-style:none}
li{display:flex;align-items:center;gap:10px;padding:10px 8px;border-bottom:1px solid #eceff5}
li.done .text{text-decoration:line-through;color:var(--done)}
.text{flex:1;word-break:break-word}
.check{width:20px;height:20px;cursor:pointer;accent-color:var(--accent)}
.del{background:none;border:none;color:var(--danger);font-size:1.1rem;cursor:pointer;padding:4px 8px;border-radius:6px}
.del:hover{background:#fdeaea}
.empty{text-align:center;color:var(--done);padding:16px 0}