:root {
  --primary: #4f46e5;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --border: #e2e8f0;
  --danger: #ef4444;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --card: #1e293b;
  --text: #f1f5f9;
  --border: #334155;
}

body {
  font-family: "Inter", sans-serif;
  background-color: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  padding-top: 50px;
  transition: all 0.3s ease;
}

.container {
  background: var(--card);
  padding: 32px;
  border-radius: 16px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 400px;
  border: 1px solid var(--border);
}

header {
  text-align: center;
  margin-bottom: 24px;
}
h2 {
  color: var(--primary);
  margin: 0;
  font-weight: 600;
}
.status-text {
  font-size: 11px;
  opacity: 0.7;
  margin-top: 4px;
}

.input-group {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

input {
  flex: 1;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  outline: none;
}

.btn {
  padding: 12px 18px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: 0.2s;
}

.btn-add {
  background: var(--primary);
  color: white;
}
.btn-add:hover {
  background: #4338ca;
}

.btn-clear {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
  width: 100%;
  margin-top: 20px;
}
.btn-clear:hover {
  background: rgba(239, 68, 68, 0.1);
}

ul {
  list-style: none;
  padding: 0;
}

li {
  background: var(--card);
  border: 1px solid var(--border);
  margin-bottom: 10px;
  padding: 12px;
  border-radius: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: transform 0.1s;
}

li:hover {
  transform: translateY(-2px);
}

.completed {
  text-decoration: line-through;
  opacity: 0.5;
}

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 10px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 20px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}