:root {
  --bg: #0f1724;
  --card: #0b1220;
  --accent: #7dd3fc;
  --muted: #94a3b8;
  --glass: rgba(255, 255, 255, 0.02);
  --success: #10b981;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

html, body {
  height: 100%;
  margin: 0;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.02)),
    radial-gradient(800px 300px at 10% 10%, rgba(125,211,252,0.04), transparent 10%),
    var(--bg);
  color: #e6eef8;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 780px;
  margin: 48px auto;
  padding: 28px;
}

header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

h1 {
  font-size: 1.3rem;
  margin: 0;
  letter-spacing: 0.2px;
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 6px 24px rgba(2,6,23,0.6);
  border: 1px solid rgba(255,255,255,0.03);
}

.new-task {
  display: flex;
  gap: 12px;
  align-items: center;
}

.new-task input[type="text"] {
  flex: 1;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.04);
  background: var(--glass);
  color: inherit;
  outline: none;
  font-size: 1rem;
}

.new-task input[type="text"]::placeholder {
  color: var(--muted);
}

.btn {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.06);
  color: var(--accent);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: transform .08s ease, box-shadow .12s;
}

.btn:active {
  transform: translateY(1px);
}

.btn.secondary {
  color: var(--muted);
  border-color: rgba(255,255,255,0.02);
}

.list {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.task {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px;
  border-radius: 10px;
  background: rgba(255,255,255,0.01);
  border: 1px solid rgba(255,255,255,0.02);
}

.task .check {
  width: 20px;
  height: 20px;
  min-width: 20px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.06);
  display: grid;
  place-items: center;
  cursor: pointer;
}

.task.completed {
  opacity: 0.6;
  text-decoration: line-through;
}

.task .content {
  flex: 1;
  overflow: hidden;
}

.task .content span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.task .actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.task button.icon {
  background: transparent;
  border: 0;
  color: var(--muted);
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
}

.footer {
  margin-top: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.filters {
  display: flex;
  gap: 8px;
}

.filter {
  padding: 8px 10px;
  border-radius: 8px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.02);
  color: var(--muted);
  cursor: pointer;
}

.filter.active {
  background: linear-gradient(90deg, rgba(125,211,252,0.08), rgba(16,185,129,0.04));
  color: var(--accent);
  border-color: rgba(125,211,252,0.14);
  font-weight: 600;
}

.stats {
  color: var(--muted);
  font-size: .95rem;
}

input:focus, button:focus {
  box-shadow: 0 0 0 4px rgba(125,211,252,0.06);
  outline: none;
}

.edit-input {
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  padding: 6px 0;
  font-size: 1rem;
}

.tips {
  color: var(--muted);
  margin-top: 12px;
  font-size: .9rem;
}

.sr-only {
  position: absolute;
  left: -9999px;
}