:root{
  /* tweak these vars to change the whole look */
  --bg: linear-gradient(135deg,#6a11cb,#2575fc);
  --card-bg: #ffffff;
  --accent: #6a11cb;
  --accent-2: #8e54e9;
  --text: #172b4d;
  --muted: #6b7280;
  --input-bg: #f4f3fb;
  --danger: #ff5b5b;
}

[data-theme="light"]{
  --bg: linear-gradient(135deg,#f6f6ff,#f2eafd);
  --card-bg: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --input-bg: #fbfafc;
}

*{box-sizing:border-box;margin:0;padding:0;font-family:'Poppins',sans-serif}
html,body{height:100%}
body{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  padding:20px;
  color:var(--text);
}

.container{width:100%;max-width:700px}
.todo-app{
  background:var(--card-bg);
  border-radius:14px;
  padding:28px;
  box-shadow:0 12px 30px rgba(10,10,20,0.18);
  transition:transform .12s ease;
}
.todo-app:hover{transform:translateY(-4px)}
.header{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.header h1{font-size:22px;letter-spacing:0.2px}
.controls button{
  background:transparent;border:none;font-size:18px;cursor:pointer;padding:6px;border-radius:8px;
}
.subtitle{color:var(--muted);margin-bottom:14px;font-size:13px}

.row{
  display:flex;gap:10px;align-items:center;background:var(--input-bg);padding:8px;border-radius:999px;margin-bottom:10px;
}
.row input{
  flex:1;border:none;background:transparent;padding:12px 14px;font-size:15px;outline:none;
}
#add-btn{
  background:var(--accent);color:#fff;border:none;padding:10px 18px;border-radius:999px;cursor:pointer;font-weight:600;
  transition:transform .12s ease, background .12s;
}
#add-btn:hover{transform:scale(1.03)}

.msg{color:var(--danger);font-size:13px;height:18px;margin:6px 0 10px;opacity:0;transition:opacity .18s}
.msg.show{opacity:1}

.toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.filters{display:flex;gap:8px}
.filter-btn{
  background:transparent;border:none;padding:6px 10px;border-radius:8px;cursor:pointer;color:var(--muted);font-weight:600;
}
.filter-btn.active{background:rgba(106,17,203,0.08);color:var(--accent);}

.counter{font-size:13px;color:var(--muted)}

.task-list{list-style:none;padding:0;margin:0}
.task-item{
  position:relative;display:flex;gap:10px;align-items:center;justify-content:space-between;
  padding:12px 14px 12px 56px;border-radius:10px;margin-bottom:10px;overflow:hidden;
  transition:background .18s, transform .12s, opacity .18s;
  background:transparent;
}

/* circular checkbox */
.task-item::before{
  content:"";position:absolute;left:18px;top:50%;transform:translateY(-50%);
  width:18px;height:18px;border-radius:50%;border:2px solid var(--accent);transition:background .18s,border-color .18s;
}
.task-item.checked::before{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));border-color:transparent;
}
.task-item.checked::after{
  content:"✓";position:absolute;left:20px;top:50%;transform:translateY(-53%);font-size:11px;color:#fff;font-weight:700;
}

.task-text{flex:1;font-size:15px;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding-right:8px}
.task-item.checked .task-text{color:var(--muted);text-decoration:line-through}

.task-time{font-size:12px;color:var(--muted);margin-right:8px;white-space:nowrap}

/* icon buttons */
.btn{background:transparent;border:none;cursor:pointer;padding:6px;border-radius:8px;font-size:15px}
.btn.edit{color:var(--accent)}
.btn.delete{color:var(--danger)}
.btn.delete:hover{background:rgba(255,91,91,0.08)}

.fade-in{animation:taskIn .22s ease}
@keyframes taskIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

.fade-out{animation:taskOut .18s ease forwards}
@keyframes taskOut{from{opacity:1;transform:none}to{opacity:0;transform:translateX(18px)}}

/* edit input */
.edit-input{flex:1;padding:8px;border-radius:8px;border:1px solid #e6e4f2;font-size:14px;outline:none}

/* small footer */
.foot{font-size:12px;color:var(--muted);margin-top:12px;text-align:center}