*{
  margin:0;
  padding:0;
  box-sizing:border-box;
  font-family:system-ui, sans-serif;
}

:root{
  --bg:#0f172a;
  --card:#020617;
  --text:#e5e7eb;
  --muted:#94a3b8;
  --accent:#22c55e;
  --danger:#ef4444;
}

body.light{
  --bg:#f8fafc;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
}

body{
  min-height:100vh;
  background:radial-gradient(circle at top,#020617,var(--bg));
  color:var(--text);
  display:flex;
  align-items:center;
  justify-content:center;
}

.app{
  width:100%;
  max-width:440px;
  background:var(--card);
  padding:24px;
  border-radius:18px;
  box-shadow:0 20px 40px rgba(0,0,0,.4);
}

h1{
  text-align:center;
  margin-bottom:16px;
  color:var(--accent);
}

/* Progress */
.progress{
  height:6px;
  background:#1e293b;
  border-radius:6px;
  overflow:hidden;
  margin-bottom:12px;
}
#progress-bar{
  height:100%;
  width:0%;
  background:var(--accent);
  transition:.3s;
}

/* Form */
#todo-form{
  display:grid;
  grid-template-columns:1fr auto auto;
  gap:8px;
  margin-bottom:14px;
}

#todo-input,
select,
input[type="date"]{
  padding:10px;
  border-radius:10px;
  border:1px solid #1e293b;
  background:transparent;
  color:var(--text);
}

#todo-form button{
  grid-column:1/-1;
  padding:10px;
  border-radius:12px;
  border:none;
  background:var(--accent);
  color:#020617;
  font-weight:600;
  cursor:pointer;
}

/* List */
#todo-list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:10px;
  margin-bottom:14px;
}

.todo{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:12px;
  border-radius:12px;
  background:rgba(255,255,255,.04);
}

.todo.done span{
  text-decoration:line-through;
  color:var(--muted);
}

.todo.overdue{
  border-left:4px solid var(--danger);
  background:rgba(239,68,68,.08);
}

.todo span{
  flex:1;
}

.badge{
  font-size:11px;
  padding:2px 6px;
  border-radius:6px;
  margin-left:6px;
}
.badge.high{background:#ef4444;}
.badge.medium{background:#f59e0b;}
.badge.low{background:#22c55e;}

.todo-actions button{
  background:none;
  border:none;
  color:var(--muted);
  cursor:pointer;
  margin-left:6px;
}
.todo-actions .delete:hover{color:var(--danger);}

/* Footer */
.footer{
  display:flex;
  justify-content:space-between;
  font-size:14px;
  color:var(--muted);
}

.filters button{
  background:none;
  border:none;
  color:var(--muted);
  cursor:pointer;
}
.filters .active{
  color:var(--accent);
  font-weight:600;
}

.controls{
  display:flex;
  gap:10px;
  justify-content:center;
  margin-top:12px;
}

.controls button{
  background:#111;
  color:#fff;
  border:1px solid #333;
  border-radius:10px;
  padding:6px 12px;
}

@media (max-width: 520px) {
  body {
    padding: 16px;
    align-items: flex-start;
  }

  .app {
    width: 100%;
    max-width: 100%;
    padding: 16px;
    border-radius: 16px;
  }

  h1 {
    font-size: 22px;
    margin-bottom: 14px;
  }

  #todo-form {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  #todo-input,
  select,
  input[type="date"] {
    width: 100%;
    font-size: 14px;
  }

  #todo-form button {
    width: 100%;
    padding: 12px;
  }


  .todo {
    padding: 10px;
    gap: 10px;
  }

  .todo span {
    font-size: 14px;
    line-height: 1.25rem;
  }

  .badge {
    font-size: 10px;
    padding: 2px 6px;
  }

  .footer {
    flex-wrap: wrap;
    gap: 8px;
    font-size: 13px;
  }

  .filters {
    width: 100%;
    display: flex;
    justify-content: space-between;
    gap: 10px;
  }

  .controls {
    flex-wrap: wrap;
    gap: 8px;
  }

  .controls button {
    flex: 1 1 140px;
    padding: 8px 12px;
  }
}

@media (max-width: 360px) {
  h1 { font-size: 20px; }
  .app { padding: 14px; }
  .filters { gap: 6px; }
}